EP0119920B1 - Process for the simultaneous desizing and bleaching of textiles - Google Patents

Process for the simultaneous desizing and bleaching of textiles Download PDF

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Publication number
EP0119920B1
EP0119920B1 EP84400513A EP84400513A EP0119920B1 EP 0119920 B1 EP0119920 B1 EP 0119920B1 EP 84400513 A EP84400513 A EP 84400513A EP 84400513 A EP84400513 A EP 84400513A EP 0119920 B1 EP0119920 B1 EP 0119920B1
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Prior art keywords
bleaching
desizing
bath
examples
buffer
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Expired
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EP84400513A
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German (de)
French (fr)
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EP0119920A2 (en
EP0119920A3 (en
Inventor
Gérard Jean-Louis Tatin
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Arkema France SA
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Atochem SA
Elf Atochem SA
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Publication of EP0119920A3 publication Critical patent/EP0119920A3/en
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Classifications

    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06LDRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L1/00Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
    • D06L1/02Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using organic solvents
    • D06L1/06De-sizing
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06LDRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L1/00Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods
    • D06L1/12Dry-cleaning or washing fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods using aqueous solvents
    • D06L1/14De-sizing
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06LDRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/10Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen

Definitions

  • the present invention relates to an improved process for desizing and bleaching fabrics in a single operation in a bath based on hydrogen peroxide.
  • the pH of the desizing-bleaching bath is more or less modified during the treatment, which leads to significant differences in the bleaching and desizing results.
  • the present invention fulfills such an object and provides an improved process for desizing - simultaneous bleaching of tissues in a bath comprising hydrogen peroxide, a sequestering agent, an amylase and a surfactant, characterized in that add to said bath a buffer consisting of sodium tetraborate decahydrate in an amount such that the pH of the bath is equal to 9.8.
  • a desizing-bleaching bath which can be used according to the invention can for example comprise: and a buffer consisting of sodium tetraborate decahydrate in a determined amount to fix the pH of the bath at 9.8 (or approximately 10 g of sodium tetraborate decahydrate per 1 bath).
  • the adoption of the desizing - simultaneous bleaching process of the present invention allows significant savings in water, steam, labor and investment and leads to desizing - bleaching results greater than those obtained without buffer or in using another buffer allowing the pH of the bath to be fixed at an equivalent value.
  • sodium tetraborate decahydrate as a buffer avoids working in a strongly alkaline medium and thus protects the treated fabric against the formation of "breaks" during deposition in folds.
  • the treatment is followed by washing at 90-95 ° C, washing at 60 ° C and cold washing.
  • the basic desizing-bleaching bath used in the examples below is as follows:
  • Examples 1 to 4 are comparative examples.
  • Example 5 illustrates a method according to the present invention.
  • Example 3 Only the use of sodium metaborate (Ex. 3) gives a higher degree of white than that obtained with sodium tetraborate decahydrate (Ex. 5 according to the invention), but the level of residual starch obtained in Example 3 is too high (the residual starch level of Example 3 is 0.61 while it is only 0.22 in Example 5 according to the invention).
  • Example 5 the hydrophilicity of Example 5 is 10 times lower than that of Example 3. It will also be noted that the degree of polymerization (DP - 1,620) obtained in Example 5 according to the invention shows that the fiber is not degraded during the desizing - bleaching operation.
  • Examples 6 to 9 are comparative examples.
  • Example 10 illustrates a method according to the present invention.
  • Example 15 illustrates a desizing-bleaching process according to the present invention.

Description

La présente invention concerne un procédé amélioré de désencollage et de blanchiment des tissus en une seule opération dans un bain à base de peroxyde d'hydrogène.The present invention relates to an improved process for desizing and bleaching fabrics in a single operation in a bath based on hydrogen peroxide.

La demanderesse a mis au point un tel procédé faisant l'objet de la demande de brevet EP-A 0055664.The applicant has developed such a process which is the subject of patent application EP-A 0055664.

Le procédé de la demande de brevet EP-A 0 055 664 utilise un bain comprenant du peroxyde d'hydrogène, de l'hydroxyde de sodium, un agent séquestrant, une amylase, un agent tensio-actif et éventuellement un agent stabilisant tel le silicate de sodium.The process of patent application EP-A 0 055 664 uses a bath comprising hydrogen peroxide, sodium hydroxide, a sequestering agent, an amylase, a surfactant and optionally a stabilizing agent such as silicate sodium.

La mise en oeuvre industrielle de ce procédé se heurte à certaines difficultés:

  • - d'une part les résultats obtenus dépendent du pH fixé au départ. En effet à un pH très alcalin le blanchiment est excellent mais le désencollage est en général insuffisant, inversement à un pH peu alcalin le désencollage est bon mais le blanchiment est insuffisant.
  • - d'autre part le niveau des résultats est étroitement lié à la nature du tissu soumis au traitement de désencollage - blanchiment, la dégradation enzymatique des amidons générant des produits acides qui font évoluer le pH au cours de la réaction.
The industrial implementation of this process faces certain difficulties:
  • - on the one hand, the results obtained depend on the pH set at the start. In fact, at a very alkaline pH, the bleaching is excellent but the desizing is generally insufficient, conversely at a slightly alkaline pH, the desizing is good but the bleaching is insufficient.
  • - on the other hand the level of the results is closely linked to the nature of the tissue subjected to the desizing treatment - bleaching, the enzymatic degradation of the starches generating acid products which cause the pH to change during the reaction.

Selon la quantité et la nature des amidons utilisés pour l'encollage du tissu le pH du bain de désencollage - blanchiment est plus ou moins modifié au cours du traitement, ce qui conduit à des écarts importants au niveau des résultats de blanchiment et de désencoliage.Depending on the quantity and nature of the starches used for sizing the fabric, the pH of the desizing-bleaching bath is more or less modified during the treatment, which leads to significant differences in the bleaching and desizing results.

Ces observations ont conduit la demanderesse à rechercher un tampon susceptible de fixer le pH du bain de désencollage - blanchiment afin de disposer d'un procédé de désencollage - blanchiment simultané permettant d'obtenir à la fois un désencollage et un blanchiment optimum tout en respectant le degré de polymérisation de la fibre.These observations have led the applicant to seek a buffer capable of fixing the pH of the desizing - bleaching bath in order to have a desizing process - simultaneous bleaching making it possible to obtain both optimum desizing and whitening while respecting the degree of polymerization of the fiber.

La présente invention répond à un tel objet et fournit un procédé amélioré de désencollage - blanchiment simultané des tissus dans un bain comprenant du peroxyde d'hydrogène, un agent séquestrant, une amylase et un agent tensio-actif caractérisé par le fait que l'on ajoute audit bain un tampon constitué par du tétraborate de sodium décahydraté en quantité telle que le pH du bain soit égal à 9,8.The present invention fulfills such an object and provides an improved process for desizing - simultaneous bleaching of tissues in a bath comprising hydrogen peroxide, a sequestering agent, an amylase and a surfactant, characterized in that add to said bath a buffer consisting of sodium tetraborate decahydrate in an amount such that the pH of the bath is equal to 9.8.

Au cours de ses recherches, la demanderesse a testé de nombreux tampons et a constaté avec surprise que pour aucun tampon à l'exception du tétraborate de sodium décahydraté, on obtenait à la fois un bon désencollage et un bon blanchiment.During its research, the plaintiff tested numerous buffers and found with surprise that for no buffer except for sodium tetraborate decahydrate, both good desizing and good bleaching were obtained.

Un bain de désencollage - blanchiment utilisable selon l'invention peut par exemple comporter:

Figure imgb0001
Figure imgb0002
et un tampon constitué par du tétraborate de sodium décahydraté en quantité déterminée pour fixer le pH du bain à 9,8 (soit environ 10 g de tétraborate de sodium décahydraté pour 1 de bain).A desizing-bleaching bath which can be used according to the invention can for example comprise:
Figure imgb0001
Figure imgb0002
and a buffer consisting of sodium tetraborate decahydrate in a determined amount to fix the pH of the bath at 9.8 (or approximately 10 g of sodium tetraborate decahydrate per 1 bath).

L'adoption du procédé de désencollage - blanchiment simultané de la présente invention permet des économies importantes en eau, vapeur, main d'oeuvre et investissements et conduit à des résultats de désencollage - blanchiment supérieurs à ceux que l'on obtient sans tampon ou en utilisant un autre tampon permettant de fixer le pH du bain à une valeur équivalente.The adoption of the desizing - simultaneous bleaching process of the present invention allows significant savings in water, steam, labor and investment and leads to desizing - bleaching results greater than those obtained without buffer or in using another buffer allowing the pH of the bath to be fixed at an equivalent value.

En outre l'utilisation du tétraborate de sodium décahydraté comme tampon évite de travailler en milieu fortement alcalin et protège ainsi le tissu traité contre la formation de «cassures» au cours d'un dépôt en plis.In addition, the use of sodium tetraborate decahydrate as a buffer avoids working in a strongly alkaline medium and thus protects the treated fabric against the formation of "breaks" during deposition in folds.

L'invention sera à présent décrite plus en détails dans les exemples non limitatifs suivants.The invention will now be described in more detail in the following nonlimiting examples.

ExemplesExamples

Les essais de désencollage - blanchiment décrits ont été réalisés selon la technique suivante:

  • 1. Imprégnation du tissu écru dans le bain de désencollage - blanchiment; exprimage pour ne laisser dans le tissu que la quantité de bain nécessaire à la réaction. Cette quantité a été fixée à 100% du poids de tissu sec.
  • 2. Vaporisage pour porter le tissu à la température de réaction souhaitée 90-95°C.
  • 3. Dépôt par enroulage ou en plis pendant une heure à température.
The desizing - bleaching tests described were carried out according to the following technique:
  • 1. Impregnation of the unbleached fabric in the desizing bath - bleaching; expressing so as to leave in the tissue only the quantity of bath necessary for the reaction. This amount was set at 100% of the weight of dry fabric.
  • 2. Spraying to bring the fabric to the desired reaction temperature 90-95 ° C.
  • 3. Deposit by winding or in folds for one hour at temperature.

Le traitement est suivi d'un lavage à 90-95°C, d'un lavage à 60°C et d'un lavage à froid.The treatment is followed by washing at 90-95 ° C, washing at 60 ° C and cold washing.

Le bain de base de désencollage - blanchiment utilisé dans les exemples ci-après est le suivant:

Figure imgb0003
The basic desizing-bleaching bath used in the examples below is as follows:
Figure imgb0003

Exemples 1 à 5Examples 1 to 5

Les exemples 1 à 5 ci-dessous ont été effectués avec une toile de coton 100% de 160 g/m2:

  • taux d'amylacés 9,20%
  • réflectance ELREPHO (La mesure du degré de blanc est effectuée à l'aide du reflectomèfre ELREPHO de la Société KARL ZEISS de la Républi- que Démocratique d'Allemagne) 56°
  • indice de polymérisation 1 940
Examples 1 to 5 below were carried out with a 100% cotton canvas of 160 g / m 2 :
  • starch rate 9.20%
  • Elrepho Reflectance (Measurement of brightness is performed using the Elrepho reflectomèfre Company KARL ZEISS of the Re p ubli- that Democratic Germany) 56 °
  • polymerization index 1,940

Les tampons suivants ont été testés (les quantités indiquées sont exprimées en g pour 1 de bain):

Figure imgb0004
The following buffers have been tested (the quantities indicated are expressed in g per 1 bath):
Figure imgb0004

Les exemples 1 à 4 sont des exemples comparatifs.Examples 1 to 4 are comparative examples.

L'exemple 5 illustre un procédé selon la présente invention.Example 5 illustrates a method according to the present invention.

Les résultats sont indiqués dans le Tableau 1 ci-après.

Figure imgb0005
The results are shown in Table 1 below.
Figure imgb0005

Seul l'emploi du métaborate de sodium (Ex. 3) donne un degré de blanc supérieur à celui obtenu avec le tétraborate de sodium décahydraté (Ex. 5 selon l'invention), mais le taux d'amidon résiduel obtenu dans l'Exemple 3 est trop élevé (le taux d'amidon résiduel de l'Exemple 3 est de 0,61 alors qu'il n'est que de 0,22 dans l'Exemple 5 selon l'invention).Only the use of sodium metaborate (Ex. 3) gives a higher degree of white than that obtained with sodium tetraborate decahydrate (Ex. 5 according to the invention), but the level of residual starch obtained in Example 3 is too high (the residual starch level of Example 3 is 0.61 while it is only 0.22 in Example 5 according to the invention).

En outre l'hydrophilie de l'Exemple 5 est 10 fois plus faible que celle de l'Exemple 3. On notera également que le degré de polymérisation (DP - 1 620) obtenu dans l'Exemple 5 selon l'invention montre que la fibre n'est pas dégradée au cours de l'opération de désencollage - blanchiment.In addition, the hydrophilicity of Example 5 is 10 times lower than that of Example 3. It will also be noted that the degree of polymerization (DP - 1,620) obtained in Example 5 according to the invention shows that the fiber is not degraded during the desizing - bleaching operation.

Exemples 6 à 10EXAMPLES 6 TO 10

Les exemples 6 à 10 ci-dessous ont été effectués avec une cretonne de coton 100% de 190 g/m2:

Figure imgb0006
Examples 6 to 10 below were carried out with a 100% cotton cretonne of 190 g / m 2 :
Figure imgb0006

Les tampons testés sont les suivants:

  • Ex. 6 tampon identique à celui de l'Ex. 1
  • Ex. 7 tampon identique à celui de l'Ex. 2
  • Ex. 8 tampon identique à celui de l'Ex. 3
  • Ex. 9 tampon identique à celui de l'Ex. 4
  • Ex. 10 tampon identique à celui de l'Ex. 5
The buffers tested are as follows:
  • Ex. 6 stamp identical to that of Ex. 1
  • Ex. 7 buffer identical to that of Ex. 2
  • Ex. 8 buffer identical to that of Ex. 3
  • Ex. 9 buffer identical to that of Ex. 4
  • Ex. 10 buffer identical to that of Ex. 5

Les Exemples 6 à 9 sont des exemples comparatifs.Examples 6 to 9 are comparative examples.

L'Exemple 10 illustre un procédé selon la présente invention.Example 10 illustrates a method according to the present invention.

Les résultats sont donnés dans le Tableau Il ci-après.

Figure imgb0007
The results are given in Table II below.
Figure imgb0007

Exemples 11 à 15Examples 11 to 15

Les exemples 11 à 15 ci-après ont été effectués avec une popeline 100% coton de 140 g/m2:

Figure imgb0008
Examples 11 to 15 below were carried out with a 100% cotton poplin of 140 g / m 2 :
Figure imgb0008

Les tampons testés sont les suivants:

  • Ex. 11 tampon identique à celui de l'Ex. 1
  • Ex. 12 tampon identique à celui de l'Ex. 2
  • Ex. 13 tampon identique à celui de l'Ex. 3
  • Ex. 14 tampon identique à celui de l'Ex. 4
  • Ex. 15 tampon identique à celui de l'Ex. 5

Les exemples 11 à 14 sont des exemples comparatifs.The buffers tested are as follows:
  • Ex. 11 buffer identical to that of Ex. 1
  • Ex. 12 buffer identical to that of Ex. 2
  • Ex. 13 buffer identical to that of Ex. 3
  • Ex. 14 buffer identical to that of Ex. 4
  • Ex. 15 buffer identical to that of Ex. 5

Examples 11 to 14 are comparative examples.

L'exemple 15 illustre un procédé de désencollage - blanchiment selon la présente invention.Example 15 illustrates a desizing-bleaching process according to the present invention.

Les résultats sont donnés dans le Tableau III ci-après.

Figure imgb0009
Les exemples ci-dessus montrent que seul l'emploi de tétraborate de sodium décahydraté selon l'invention permet d'obtenir à la fois un bon blanchiment et un désencollage satisfaisant.The results are given in Table III below.
Figure imgb0009
The above examples show that only the use of sodium tetraborate decahydrate according to the invention makes it possible to obtain both good whitening and satisfactory desizing.

Exemples 16 à 18Examples 16 to 18

Le bain décrit ci-dessus auquel on a ajouté 10 g/I de tétraborate de sodium décahydraté a été utilisé poru effectuer le désencollage - blanchiment simultané de trois tissus différents de polyester - coton 67/33 dont les taux d'amylacés sontThe bath described above to which 10 g / l of sodium tetraborate decahydrate was added was used to carry out desizing - bleached simultaneous use of three different polyester - cotton 67/33 fabrics with starch levels

respectivement de:

  • 12,2%: Ex. 16
  • 9,5%: Ex.17
  • 8,9%: Ex.18
respectively from:
  • 12.2%: Ex. 16
  • 9.5%: Ex. 17
  • 8.9%: Ex. 18

Les résultats sont donnés dans le Tableau IV ci-après.

Figure imgb0010
Le désencollage est total et le blanc obtenu est remarquable.The results are given in Table IV below.
Figure imgb0010
Desizing is total and the white obtained is remarkable.

Claims (1)

  1. Process for simultaneous desizing and bleaching of textiles in a bath comprising hydrogen peroxide, a sequestering agent, an amylase and a surface-active agent, characterized in that a buffer consisting of sodium tetraborate decahydrate is added to the said bath, in such quantity that the pH of the bath is 9.8.
EP84400513A 1983-03-22 1984-03-14 Process for the simultaneous desizing and bleaching of textiles Expired EP0119920B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8304646 1983-03-22
FR838304646A FR2543181B1 (en) 1983-03-22 1983-03-22 IMPROVED SIMULTANEOUS DE-SIZING AND BLEACHING OF TISSUES

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EP0119920A2 EP0119920A2 (en) 1984-09-26
EP0119920A3 EP0119920A3 (en) 1986-01-29
EP0119920B1 true EP0119920B1 (en) 1987-09-16

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KR (1) KR840007919A (en)
BR (1) BR8401250A (en)
CA (1) CA1202582A (en)
DE (2) DE119920T1 (en)
DZ (1) DZ621A1 (en)
EG (1) EG16173A (en)
ES (1) ES8504992A1 (en)
FR (1) FR2543181B1 (en)
MA (1) MA20067A1 (en)
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DE2735816C3 (en) * 1977-08-09 1981-08-13 Basf Ag, 6700 Ludwigshafen Process for desizing and bleaching textile goods
DE2909396B2 (en) * 1979-03-09 1981-07-30 Diamalt AG, 8000 München Desizing agent and process for its manufacture
JPS599661B2 (en) * 1980-08-06 1984-03-03 三菱瓦斯化学株式会社 Method for desizing textile fabrics
JPS599662B2 (en) * 1980-08-18 1984-03-03 三菱瓦斯化学株式会社 Method for desizing textile fabrics
FR2497244A1 (en) * 1980-12-31 1982-07-02 Ugine Kuhlmann METHOD FOR DEBRATING AND BLEACHING FABRICS IN A SINGLE OPERATION IN A HYDROGEN PEROXIDE BASED BATH

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EG16173A (en) 1990-10-30
ES530811A0 (en) 1985-04-16
DZ621A1 (en) 2004-09-13
EP0119920A2 (en) 1984-09-26
BR8401250A (en) 1984-10-30
US4536182A (en) 1985-08-20
FR2543181A1 (en) 1984-09-28
JPS59179873A (en) 1984-10-12
ES8504992A1 (en) 1985-04-16
MA20067A1 (en) 1984-10-01
KR840007919A (en) 1984-12-11
EP0119920A3 (en) 1986-01-29
DE3466256D1 (en) 1987-10-22
FR2543181B1 (en) 1985-07-26
CA1202582A (en) 1986-04-01
OA07685A (en) 1985-05-23
JPH0137511B2 (en) 1989-08-08
DE119920T1 (en) 1985-03-28

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