CN1224701A - Hot-pressing production process of composite plant fiber-cement board - Google Patents
Hot-pressing production process of composite plant fiber-cement board Download PDFInfo
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- CN1224701A CN1224701A CN99100196A CN99100196A CN1224701A CN 1224701 A CN1224701 A CN 1224701A CN 99100196 A CN99100196 A CN 99100196A CN 99100196 A CN99100196 A CN 99100196A CN 1224701 A CN1224701 A CN 1224701A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The present invention relates to the field of building material and is one improvement of Patent No.92104346.5, "production process of composite plant fiber-cement board". The present invention increases calcium carbonate or sodium bicarbonate, water glass, sodium fluorosilicate and other material into available material. The material is stirred for three times, and by means of hot pressing, humidifying treatment and other technological measures, composite plant fiber-cement board is produced in common hot press in short pressing period of ten-odd minutes, greatly shorter than original 6-8 hours. The present invention has very low investment in equipment, low product cost and high product quality.
Description
The invention belongs to building material manufacture field, relate to improvement the composite plant fiber-cement board production method.
Composite plant fiber-cement board is that a kind of good building, decoration and furniture are made material, is classified as the material that emphasis is promoted by the Ministry of Construction in China.Chinese patent CN92104363.5 disclose a kind of be applicable to the higher vegetable fibre of anti-coagulating action substances content particularly the fiber of yearly plant make the method for cement composite board.This patent adopts new approach when solving this problem of anticoagulation of vegetable fibre extract, promptly manage a vegetable fibre and cement and keep apart, and extract is significantly reduced and is difficult to influence solidifying of cement.When vegetable fibre being mixed stirring with calcium oxide, calcium chloride and water, calcium oxide and calcium chloride can generate the liquid that heavy-gravity comprises oxychlorination calcium, they soak into parcel to vegetable fibre, stopped up the cell vestibule of vegetable fibre, also made the anti-coagulating action composition in the fiber be difficult to separate out and reduce activity simultaneously.During again with the cement mix, vegetable fibre is difficult to directly contact with alkaline liquid, thereby has significantly reduced the wherein quantity of hydrolysis such as starch, hemicellulose saccharogenesis, thereby has suppressed the performance of its anticoagulation through the vegetable fibre of this processing.This method is to use and contains the bigger vegetable fibre of extract quantity, the effective ways of suitability for industrialized production cement composite board.But this method generally adopts cold press process, its shortcoming is: because cement needs 6～8 hours setting time after the slab compression moulding, therefore slab need be stayed in the mould, promptly under the state of locked mode, be sent into drying room and promote it to solidify, treat that slab could the demoulding after reaching certain intensity.The sheet material of Sheng Chaning uses the chronic of mould like this, is referred to as long period.The long period method needs large quantities of locked mode anchor clamps, backing plate and tunnel furnace in producing, and investment is big, has increased production cost and difficulty.The sheet metal thickness error that simultaneously this method is produced is bigger, can not produce thin sheet material.This patent is also mentioned and is a kind ofly carried out hot pressed method after adding some tackiness agent, and this is the measure of taking in order to produce thin sheet material, can produce the thinnest 6 millimeters sheet material with this method.But this hot-press method still need carry out locked mode after compacting, and slab is put into after the drying room oven dry together with mould could the demoulding, still belongs to long period, has the shortcoming that the hardening of cement time is long, investment is big, cost is high equally.
In recent ten years, occurred a kind of pressure sintering abroad, claimed the short period method again, it shortens to tens minutes with the hardening of cement time, has both saved large quantities of locked mode anchor clamps, can guarantee that again the thickness of sheet material is even.There have been the factory that uses this processing method in Finland and Hungary.But this technology must be used special thermocompressor and mould, when the compacting slab, the air in the slab must be extracted out, and near vacuum, and in slab, feed CO
2Gas, the quality of sheet material are subjected to vacuum tightness, the CO in the slab
2The uniformity coefficient that gas distributes in slab, the seal degree of thermocompressor, CO
2Gas is by the influences such as absorbed dose of slab.Not only thermocompressor cost height, and CO
2Gas evolution also can cause environmental pollution.Because having above-mentioned shortcoming, this technology fails to promote so far.In China, only there is some colleges and universities this processing method to be carried out research in the laboratory.
The purpose of this invention is to provide a kind of hot-press method of producing composite plant fiber-cement board, do not need slab to be vacuumized and lead to CO
2Gas uses the ordinary hot press, just the hardening of cement time in the composite plant fiber-cement board of compacting can be shortened to about tens minutes, thereby reduces found the factory investment and product cost.Simultaneously can suppress thinner sheet material, the thinlyyest reach 4 millimeters, and can guarantee the thickness uniformity coefficient of product.
Technical scheme of the present invention is: a kind of hot-pressing production process of composite plant fiber-cement board, with the vegetable fibre is strongthener, with cement particularly silicate cement be tackiness agent, its processing step comprises the Mechanical Crushing of plant material and screening process, and to the making sheet raw material that mixes mat formation, hot pressing and aftertreatment, it is characterized in that
(1) composition of making sheet raw material and consumption are as follows:
A, vegetable fibre, its oven dry weight account for 15～30% of the vegetable fibre production board oven dry weight made;
B, amount of water are 20～40% of the vegetable fibre production board oven dry weights made;
C, calcium oxide or calcium hydroxide account for 4～10% of the vegetable fibre production board oven dry weight made;
D, calcium chloride or magnesium chloride, account for add 30～60% of calcium oxide or calcium hydroxide weight;
E, lime carbonate or sodium bicarbonate account for 7～13% of the vegetable fibre production board oven dry weight made;
F, water glass account for 4～10% of the vegetable fibre production board oven dry weight made;
G, Sodium Silicofluoride account for 10～15% of water glass weight;
H, cement account for 50～66% of the vegetable fibre production board oven dry weight made;
(2) mixing of making sheet raw material is finished by three stirrings, adds vegetable fibre, water, calcium oxide or calcium hydroxide, calcium chloride or magnesium chloride, lime carbonate or sodium bicarbonate, Sodium Silicofluoride when stirring for the first time in stirrer and stirs certain hour jointly; Add water glass when stirring for the second time, the restir certain hour, wait the thick liquid that generated with the vegetable fibre parcel evenly after, stir for the third time; Before stirring for the third time, add an amount of cement, through stirring, even with the mixing of materials of preceding twice stirring;
(3) processing parameter during hot pressing is as follows:
Hot pressing temperature is 90～125 ℃;
Pressure is 2.0～3.5MPa;
Hot pressing time is determined by following experimental formula:
T=160 (t-80)
-1+ μ [α
-1+ (β+γ)
-1]+0.5 (δ+η-29)+ξ, in the formula,
T is a hot pressing time, minute being unit;
T is a temperature on the heating platen, value between 90～125 ℃;
μ is a vegetable fibre kind adjustment factor, and value between 21～30 is minute being unit;
α is the percentage ratio that lime carbonate or sodium bicarbonate account for the production board oven dry weight, is zero dimension;
β is the per-cent that calcium chloride or magnesium chloride account for the production board oven dry weight, is zero dimension;
γ is the per-cent that calcium oxide or calcium hydroxide account for the production board oven dry weight, is zero dimension;
δ is the per-cent that the water yield of adding accounts for the production board oven dry weight, is zero dimension;
η has considered that Total Water that the vegetable fibre moisture percentage calculates later on accounts for the per-cent of production board oven dry weight, is zero dimension;
ξ is the sheet metal thickness adjustment factor, and minute to be unit, when production board thickness was 4～8 millimeters, the ξ value was-1; When production board thickness was 9～18 millimeters, the ξ value was that the millimeter of production board actual (real) thickness subtracts 9; When production board thickness was 19～30 millimeters, the ξ value was 10;
(4) composite plant fiber-cement board after the hot pressing being placed on temperature is that 15～30 ℃, relative humidity are to carry out in 50～70% the environment sawing postprocessing working procedures such as limit, normal temperature maintenance again after humidification handled 5～7 days.
Advantage of the present invention is: shortened the setting time of cement composite board greatly than long period method, thereby saved a large amount of moulds, anchor clamps, backing plate and kiln, saved investment, shortened Production Flow Chart, reduced cost, improved quality product; Compare with external hot-press method,, simplify production process, prevent the pollution of the environment, reduce product cost guaranteeing to save a large amount of facility investments under the product quality premise.
Below the inventive method is elaborated.The inventive method can adopt yearly plant or perennial plant to make sheet material as plant fiber material, and yearly plant comprises: hemp stalk, cotton stalk, cornstalk (core), sunflower stalk (dish, shell), cigarette stalk, straw, reed, cogongrass stalk, bagasse, melon seedling, straw (shell), Pericarppium arachidis hypogaeae, hards, paddy stalk, sorghum stalk, beans stalk, kapok bits, Exocarpium cocois (Cocos nucifera L); Perennial plant comprises the industrial wood waste of arbor, shrub, branch material, bamboo and above-mentioned plant.In the fragmentation of vegetable fibre, screen, mat formation, in the processing step such as aftertreatment, the present invention has adopted and the essentially identical method of CN92104363.5 patent, for example adopts " parcel is theoretical " to solve the anti-coagulating action problem of vegetable fibre extract to cement.By vegetable fibre is mixed stirring with calcium oxide, calcium chloride and water, the thick liquid that calcium oxide and calcium chloride water are generated, soak into the parcel vegetable fibre, stop up the cell vestibule of vegetable fibre, make the anti-coagulating action composition in the vegetable fibre be difficult to separate out and reduce activity, thereby suppress the anticoagulation of vegetable fibre.At this, the above-mentioned identical processing step and the mechanism of inhibition vegetable fibre anticoagulation are repeated no more.
Creativeness of the present invention mainly has been to solve a difficult problem that shortens the time that thes cement solidifies in the vegetable fibre composition board pressing process, and the main points of head it off are following three key problem in technology: the one, and the prescription of optimization making sheet raw material; The 2nd, grasp appropriate hot pressing time; The 3rd, carry out humidification after the hot pressing and handle.Be illustrated respectively below.
First key problem in technology is to increase new constituent in the making sheet raw material, the first, in the making sheet raw material, add an amount of lime carbonate or sodium bicarbonate, mix with other making sheet raw materials, its consumption is 7～13% of the vegetable fibre production board oven dry weight made, adds when stirring for the first time.The second, in the making sheet raw material, add an amount of water glass and Sodium Silicofluoride, the reason of immediate response caking during owing to water glass and calcium chloride water mixing, water glass can not add when stirring for the first time, must when stirring for the second time, add separately, add cement and then become stirring for the third time, like this, the process that the mixing of making sheet raw material is become stir for three times.The time of stirring is 3～7 minutes for the first time, and the time of stirring is 2～6 minutes for the second time, and the time of Jiao Baning is 4～6 minutes for the third time.Sodium Silicofluoride is the stiffening agent of water glass, and it can accelerate the setting rate of water glass, and it can add with other raw materials when stirring for the first time.The effect of the new constituent that increases is, when slab hot pressing, is blended in lime carbonate or sodium bicarbonate decomposes in the raw material, produces a large amount of CO
2Gas.Because lime carbonate or sodium bicarbonate mix with other making sheet raw materials, make the CO of generation
2Gas can fully contact with the cement in the making sheet raw material uniformly, because CO
2Gas can solidify cement rapidly to the charing effect of cement.Simultaneously, the water glass of adding also solidifies rapidly under the effect of Sodium Silicofluoride, has further increased the first intensity of slab, makes slab reach the intensity that satisfies demoulding requirement very soon, realizes short period production.
Second key problem in technology is accurately to grasp hot pressing time.In short period was produced, determining of hot pressing time was one of key issue that influences quality product.Hot pressing time is long, and the moisture in the slab in the cement is dried, and is difficult to carry out aquation again, and sheet material does not have intensity; Hot pressing time is too short, and slab does not reach intensity just, can not the demoulding unload plate.The factor that influences hot pressing time is a lot, through experiment, can adopt following experimental formula to calculate suitable hot pressing time:
T=160 (t-80)
-1+ μ [α
-1+ (β+γ)
-1]+0.5 (δ+η-29)+ξ, in the formula,
T is a hot pressing time, minute being unit; T is the medial temperature on the last lower hot pressing board, value between 90～125 ℃; μ is a vegetable fibre kind adjustment factor, and value between 21～30 is minute being unit; α is the percentage ratio that lime carbonate or sodium bicarbonate account for the production board oven dry weight, is zero dimension; β is the per-cent that calcium chloride or magnesium chloride account for the production board oven dry weight, is zero dimension; γ is that calcium oxide or calcium hydroxide account for production board oven dry weight per-cent, is zero dimension; δ is the per-cent that the water yield of adding accounts for the production board oven dry weight, is zero dimension; η has considered that Total Water that the vegetable fibre moisture percentage calculates later on accounts for the per-cent of production board oven dry weight, is zero dimension; ξ is the sheet metal thickness adjustment factor, and minute to be unit, when the finished product plate thickness was 4～8 millimeters, value was-1; When production board thickness was 9～18 millimeters, value was that the millimeter of production board actual (real) thickness subtracts 9; When production board thickness was 19～30 millimeters, value was 10.Production board thickness is called extraordinary thickness when being 19～30 millimeters, when suppressing this class sheet material, because slab is very thick, when hot pressing temperature during in lower bound, hot pressing time may prolong, the longest reaching about 30 minutes.Following table provides the hot pressing time calculated examples of 8 embodiment, and the numbering of each embodiment is general to other forms of this paper in the table, and for example the example 1 in each table all refers to embodiment 1, and the rest may be inferred by analogy for it.
Table 1 hot pressing time reckoner
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | |
| ?T | ?12 | ?11 | ?12 | ?9 | ?12 | ?20 | ?7.5 | ?33 |
| ?t | ?120 | ?118 | ?120 | ?115 | ?120 | ?100 | ?125 | ?90 |
| ?μ | ?30 | ?21 | ?30 | ?26 | ?29 | ?22 | ?22 | ?30 |
| ?α | ?9.2 | ?6.7 | ?11.2 | ?13 | ?11.4 | ?9.45 | ?9 | ?9.4 |
| ?β | ?6.6 | ?5 | ?5.8 | ?6.6 | ?5.8 | ?6.7 | ?3.5 | ?6 |
| ?γ | ?7.2 | ?6.8 | ?8 | ?9.5 | ?8.1 | ?7.6 | ?6.3 | ?7 |
| ?δ | ?29 | ?29 | ?30 | ?31.4 | ?29.2 | ?27 | ?28 | ?29 |
| ?η | ?3 | ?1 | ?2 | ?1 | ?3 | ?1 | ?1 | ?3 |
| ξ | ?1 | ?1 | ?1 | ?-1 | ?1 | ?9 | ?-1 | ?10 |
Can adopt the hot pressing machinery of general production wood-based plate during hot pressing, hot pressing temperature is 90～125 ℃, and pressure is 2.0～3.5Mpa.
The 3rd key problem in technology is to carry out humidification after the hot pressing immediately to handle.It is that 15～30 ℃, relative humidity are to stack 5～7 days in 50～70% the environment that composite plant fiber-cement board after the hot pressing is placed on temperature.Because in hot pressed tens minutes, though the cement in the slab can reach demoulding transportation, the desired intensity just in saw limit, not fully aquation and sclerosis as yet.For improving the later strength of sheet material, must make cement that the process of abundant aquation is arranged.It is exactly in order to reach this purpose that humidification is handled.
Because the present invention has adopted above-mentioned three technology key, uses common thermocompressor, for example produces the equipment of shaving board and fiberboard, also can adopt the short period method to produce plant fiber composite plate.For some outmoded shaving board production units, transform a little, also can produce qualified vegetable fibre composition board, this has just saved facility investment greatly, has reduced product cost.
In order further to improve the performance of sheet material, when the making sheet raw material that mixes is mated formation into slab, can cover and/or in the middle of slab, add glass fibre or its fabric, cotton fibriia or its fabric, non-woven fabrics, wire netting, tinsel, wire, wash reinforcement material such as reinforcing bar in the upper and lower surface of slab, carry out hot pressing then.
Embodiment 1.Batching: 1.7 kilograms of ordinary Portland cements, through 0.5 kilogram of the wheat straw stalk of fragmentation, 0.2 kilogram in calcium chloride, 0.22 kilogram of calcium lime powder, 0.28 kilogram of Paris white, 0.12 kilogram of water glass, 0.02 kilogram of Sodium Silicofluoride, 0.9 kilogram in water.Operation steps: earlier with the wheat straw bar, calcium lime powder, Paris white, Sodium Silicofluoride, calcium chloride and water are put into stirrer and were stirred 5 minutes, adding water glass again stirred 3 minutes, adding cement again stirred 5 minutes, in stirrer, discharge, mat formation and scribbling on the A3 steel plate of used oil, slab is of a size of 48 * 48 * 3 centimetres, send into thermocompressor hot pressing, pressure 3.3Mpa, 120 ℃ of temperature, hot pressing time 12 minutes, the plank that taking-up suppresses, 10 millimeters of thickness are tested immediately, just intensity is 2.5MPa, putting into temperature is 20 ℃, and relative air humidity is in 65% the moistening tank, places and takes out the saw limit after 7 days, be placed on normal temperature again and test panel density 1.31g/cm after following 28 days
3, water ratio 12%, plane tensile strength 0.41MPa, MOR 9.6MPa soaks thickness swelling rate 2% after 24 hours.
Because the operation steps of embodiment is identical, other embodiment provides composition of raw materials, hot compression parameters and performance data in the mode of tabulation.
Table 2 embodiment 2～8 composition of raw materials tables, weight unit are kilogram.
| Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | |
| Plant variety | The wood branch | Corn stalk | The fiber crops short flannel | Cotton bavin stalk | Hemp stalk | The bamboo silk | Reed |
| Plant fine weight | 0.58 | ?0.5 | ?0.28 | ?0.58 | ?0.65 | ?0.28 | ?1.34 |
| Cement type | Slag | Silicate | Silicate | Silicate | Silicate | Silicate | Slag |
| Cement weight | ?1.6 | ?1.7 | ?0.9 | ?1.6 | ?2.9 | ?0.82 | ?4.1 |
| ?CaCl 2 | ?0.15 | ?0.18 | ?0.09 | ?0.18 | ??-- | ?0.05 | ??-- |
| ?MgCl 2 | ??-- | ??-- | ??-- | ??-- | ?0.32 | ??-- | ?0.45 |
| ?CaO | ??-- | ?0.25 | ?0.13 | ?0.25 | ??-- | ?0.09 | ??-- |
| ?Ca(OH) 2 | ?0.2 | ??-- | ??-- | ??-- | ?0.36 | ??-- | ?0.52 |
| ?CaCO 3 | ??-- | ?0.35 | ?0.18 | ?0.35 | ??-- | ?0.13 | ?0.70 |
| ?NaHCO 3 | ?0.28 | ??-- | ??-- | ??-- | ?0.45 | ??-- | ??-- |
| Water glass | ?0.12 | ?0.12 | ?0.08 | ?0.12 | ?0.07 | ?0.06 | ?0.30 |
| Sodium Silicofluoride | ?0.02 | ?0.02 | ?0.01 | ?0.02 | ?0.01 | ?0.007 | ?0.05 |
| Water | ?0.86 | ?0.94 | ?0.43 | ?0.9 | ?1.3 | ?0.40 | ?2.16 |
Table 3 embodiment 2～8 processing parameters and performance table
*Tensile strength is plane tensile strength.
*Rate of expansion is to soak 24 hours thickness swelling rates afterwards in the water.
| Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | |
| Stir for the first time | 5 minutes | 5 minutes | 4 minutes | 5 minutes | 6 minutes | 3 minutes | 7 minutes |
| Stir for the second time | 3 minutes | 3 minutes | 2 minutes | 3 minutes | 5 minutes | 2 minutes | 6 minutes |
| Stir for the third time | 5 minutes | 4 minutes | 3 minutes | 4 minutes | 6 minutes | 3 minutes | 6 minutes |
| Hot pressing temperature ℃ | ?118 | ?120 | ?115 | ?120 | ?100 | ?125 | ?90 |
| Pressure MPa | ?2.9 | ?3.2 | ?3.0 | ?3.2 | ?3.0 | ?3.1 | ?2.8 |
| Time minute | ?11 | ?12 | ?9 | ?12 | ?20 | ?7.5 | ?33 |
| Humidification temperature ℃ | ?20 | ?25 | ?19 | ?18 | ?25 | ?15 | ?30 |
| Humidification humidity % | ?60 | ?62 | ?52 | ?62 | ?68 | ?50 | ?70 |
| Humidification time sky | ?6 | ?6 | ?5 | ?6 | ?7 | ?4 | ?7 |
| Density g/cm 3 | ?1.28 | ?1.36 | ?1.37 | ?1.35 | ?1.15 | ?1.56 | ?1.2 |
| Water ratio % | ?11.5 | ?10.5 | ?11.0 | ?11.5 | ?9.5 | ?8 | ?10.8 |
| Folding strength MPa | ?13.5 | ?9.6 | ?14.8 | ?12.2 | ?8.5 | ?16.2 | ?8.9 |
| Tensile strength *MPa | ?0.40 | ?0.45 | ?0.60 | ?0.41 | ?0.36 | ???- | ?0.37 |
| Rate of expansion *％ | ?2.1 | ?1.8 | ?1.2 | ?1.9 | ?2.4 | ?1.2 | ?1.8 |
| Final dimension cm | ?48×48 ?×1.0 | ?48×48 ?×1.0 | ?45×45 ?×0.6 | ?48×48 ?×1.0 | ?48×48 ?×1.8 | ?48×48 ?×0.4 | ?48×48 ?×2.7 |
Claims (4)
1, a kind of hot-pressing production process of composite plant fiber-cement board, with the vegetable fibre is strongthener, with cement particularly silicate cement be tackiness agent, its processing step comprises the Mechanical Crushing of plant material and screening process, and to the making sheet raw material that mixes mat formation, hot pressing and aftertreatment, it is characterized in that
(1) composition of making sheet raw material and consumption are as follows:
A, vegetable fibre, its oven dry weight account for 15～30% of the vegetable fibre production board oven dry weight made;
B, amount of water are 20～40% of the vegetable fibre production board oven dry weights made;
C, calcium oxide or calcium hydroxide account for 4～10% of the vegetable fibre production board oven dry weight made;
D, calcium chloride or magnesium chloride, account for add 30～60% of calcium oxide or calcium hydroxide weight;
E, lime carbonate or sodium bicarbonate account for 7～13% of the vegetable fibre production board oven dry weight made;
F, water glass account for 4～10% of the vegetable fibre production board oven dry weight made;
G, Sodium Silicofluoride account for 10～15% of water glass weight;
H, cement account for 50～66% of the vegetable fibre production board oven dry weight made;
(2) mixing of making sheet raw material is finished by three stirrings, adds vegetable fibre, water, calcium oxide or calcium hydroxide, calcium chloride or magnesium chloride, lime carbonate or sodium bicarbonate, Sodium Silicofluoride when stirring for the first time in stirrer and stirs certain hour jointly; Add water glass when stirring for the second time, the restir certain hour, wait the thick liquid that generated with the vegetable fibre parcel evenly after, stir for the third time; Before stirring for the third time, add an amount of cement, through stirring, even with the mixing of materials of preceding twice stirring;
(3) processing parameter during hot pressing is as follows:
Hot pressing temperature is 90～125 ℃;
Pressure is 2.0～3.5MPa;
Hot pressing time is determined by following experimental formula:
T=160 (t-80)
-1+ μ [α
-1+ (β+γ)
-1]+0.5 (δ+η-29)+ξ, in the formula,
T is a hot pressing time, minute being unit;
T is a temperature on the heating platen, value between 90～125 ℃;
μ is a vegetable fibre kind adjustment factor, and value between 21～30 is minute being unit;
α is the percentage ratio that lime carbonate or sodium bicarbonate account for the production board oven dry weight, is zero dimension;
β is the per-cent that calcium chloride or magnesium chloride account for the production board oven dry weight, is zero dimension;
γ is the per-cent that calcium oxide or calcium hydroxide account for the production board oven dry weight, is zero dimension;
δ is the per-cent that the water yield of adding accounts for the production board oven dry weight, is zero dimension;
η has considered that Total Water that the vegetable fibre moisture percentage calculates later on accounts for the per-cent of production board oven dry weight, is zero dimension;
ξ is the sheet metal thickness adjustment factor, and minute to be unit, when production board thickness was 4～8 millimeters, the ξ value was-1; When production board thickness was 9～18 millimeters, the ξ value was that the millimeter of production board actual (real) thickness subtracts 9; When production board thickness was 19～30 millimeters, the ξ value was 10;
(4) composite plant fiber-cement board after the hot pressing being placed on temperature is that 15～30 ℃, relative humidity are to carry out in 50～70% the environment sawing postprocessing working procedures such as limit, normal temperature maintenance again after humidification handled 5～7 days.
2, hot-pressing production process of composite plant fiber-cement board according to claim 1, it is characterized in that, the plant fiber material that is adopted can be yearly plant or perennial plant raw material, and yearly plant comprises: hemp stalk, cotton stalk, cornstalk (core), sunflower stalk (dish, shell), cigarette stalk, straw, reed, cogongrass stalk, bagasse, melon seedling, straw (shell), Pericarppium arachidis hypogaeae, hards, paddy stalk, sorghum stalk, beans stalk, kapok bits, Exocarpium cocois (Cocos nucifera L); Perennial plant comprises the industrial wood waste of arbor, shrub, branch material, bamboo and above-mentioned plant.
3, hot-pressing production process of composite plant fiber-cement board according to claim 1 and 2 is characterized in that, the time of stirring is 3～7 minutes for the first time, and the time of stirring is 2～6 minutes for the second time, and the time of Jiao Baning is 4～6 minutes for the third time.
4, hot-pressing production process of composite plant fiber-cement board according to claim 3, it is characterized in that, when the making sheet raw material that mixes is mated formation into slab, can cover and/or in the middle of slab, add glass fibre or its fabric, cotton fibriia or its fabric, non-woven fabrics, wire netting, tinsel, wire, fine steel rib etc. in the upper and lower surface of slab, carry out hot pressing then.
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| US7658794B2 (en) | 2000-03-14 | 2010-02-09 | James Hardie Technology Limited | Fiber cement building materials with low density additives |
| US7815841B2 (en) | 2000-10-04 | 2010-10-19 | James Hardie Technology Limited | Fiber cement composite materials using sized cellulose fibers |
| US7942964B2 (en) | 2003-01-09 | 2011-05-17 | James Hardie Technology Limited | Fiber cement composite materials using bleached cellulose fibers |
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| CN1038631A (en) * | 1988-06-23 | 1990-01-10 | 山东建筑材料工业学院 | Composite plant fiber-cement board and preparation method |
| CN1030439C (en) * | 1989-03-16 | 1995-12-06 | 杨众达 | Composite vegetable board and manufacturing process thereof |
| CN1050177A (en) * | 1989-09-11 | 1991-03-27 | 山东建筑材料工业学院 | Enclose frame and plant fine foamed cement composition board and manufacturing process thereof |
| CN1067639A (en) * | 1991-06-10 | 1993-01-06 | 山东建筑材料工业学院 | Fire-retarding compound board made of plant fabric and raw-vermiculite |
| CN1024342C (en) * | 1992-06-12 | 1994-04-27 | 山东建筑材料工业学院 | Manufacturing method of composite annual fiber cement panel |
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1999
- 1999-01-19 CN CN99100196A patent/CN1099391C/en not_active Expired - Fee Related
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