JPH0240787B2 - FUAINOKAIRYOSARETASERUROOSUKEISENIKOZOBUTSUNOSEIZOHO - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a method for modifying cellulose fibers, and in particular to a method for obtaining a cellulose fiber structure with improved hand and less loss of strength. (Prior Art) Conventionally, as a method for improving the texture of cellulose fibers, it has been known to treat them with an aqueous solution containing cellulose (for example, Japanese Patent Publication No. 48236/1983). However, treatment with a cellulose-containing aqueous solution improves the texture but significantly reduces the strength. For this reason, Japanese Patent Application Laid-Open No. 58-54082 discloses that cellulase treatment is performed after pretreatment with an aqueous solution of a swelling agent such as sulfuric acid, phosphoric acid, zinc chloride, or sodium hydroxide, which has the ability to dissolve cellulose fibers. It is described that the texture of the fibers can be improved by using the method without causing a significant decrease in strength. (Problems to be Solved by the Invention) However, even if the method disclosed in the prior art is used, it is difficult to sufficiently suppress the decrease in strength, and problems still arise in practice. The present invention is intended to solve these problems, and aims to improve the feel of cellulose fibers without reducing their strength. (Means for Solving the Problems) That is, the present invention pre-treats a cellulose-based fibrous structure with an aqueous swelling agent solution, then processes the surface of the fibrous structure with a resin that inhibits enzyme activity, and then processes it with a cellulase enzyme. This is a method for producing a cellulose-based fibrous structure with improved texture. The cellulose fibers targeted by the present invention are:
In addition to natural cellulose such as cotton, regenerated cellulose fibers such as viscose rayon and Kyupura can also be used. The present fiber structure is preferably a woven or knitted fabric using the above-mentioned cellulose fibers, containing about 50% by weight or more, and includes polyamide-based, polyester-based, polyvinyl alcohol-based, polyolefin-based, polyurethane-based, etc. May be mixed with other synthetic fibers. The swelling agent used in the present invention is disclosed in Japanese Patent Application Laid-Open No. 58-54082.
It has the ability to dissolve cellulose fibers, and examples include sulfuric acid, phosphoric acid, zinc chloride, and sodium hydroxide, as described in . The temperature and time of pretreatment using such a swelling agent depend on the type and concentration of the swelling agent and the type of fiber to be treated, but usually the concentration is 10 to 60% by weight.
It is carried out for about 30 seconds at 5 to 50°C using an aqueous solution of about 100 mL. After washing the pretreated cellulose fibers with water,
When an acid or alkali is used as a swelling agent, it is preferable to neutralize it with a suitable neutralizing agent before carrying out the next resin processing. The resin used in resin processing includes resins that inhibit cellulase enzyme activity, such as crosslinked or condensed fiber processing resins such as melamine resins, glyoxal resins, and urea-formalin resins. Such a resin is provided with a solid content of 1 to 7% by weight based on the weight of the fiber structure using a catalyst such as magnesium chloride, zinc nitrate, or organic amine salt. Furthermore, after applying the resin processing liquid to the fiber structure, drying is performed at a dry heat temperature of 100 to 170°C, preferably 150 to 170°C, which is higher than the normal drying temperature, for 2 to 3 minutes, and further drying is performed at 150 to 170°C. Perform heat treatment at 170℃.
In the method of drying in a tenter at 100 to 130°C followed by heat treatment at 150 to 160°C, which is carried out in general resin processing, resinization progresses to the inside of the fiber, weakening the effect of subsequent treatment with cellulase enzymes. In the present invention, the resin is migrated onto the fiber surface by heat treatment at a relatively high temperature, and only the fiber surface is processed with the resin. The resin-treated fiber structure is washed with water to remove unreacted resin, and then subjected to cellulase treatment. Cellulases used in the present invention include cellulase A3 (commercial product from Amano Pharmaceutical Co., Ltd., bacterial cell Aspergillus layer), cellulase T-AP4 (commercial product from Amano Pharmaceutical Co., Ltd.,
Bacterium Trichoderma spp.), Meicelase (Meiji Pharmaceutical Commercial Product, Bacterium Trichoderma spp.), Cellulase XP
-425 (Nagase Sangyo, bacterial cell Trichoderma genus), Celluclast (commercial product of Novo Corporation, bacterial cell Trichoderma genus), and the like are exemplified. Such cellulases are usually 0.1
Make ~5.0% aqueous solution and use acetic acid, acetate, etc.
Adjust the pH to 3-6 and use it as a cellulase-treated solution. There are various methods for treating fibers with cellulase, such as immersing the fabric in a cellulase solution that has been kept at an activation temperature and holding it there, or impregnating the fabric with a cellulase solution and then squeezing the fabric. This is carried out by passing through a temperature-controlled zone, or by winding it up into a roll to keep it warm while preventing water evaporation, and then carrying out an enzyme reaction, but a method in which it is carried out under humid conditions is preferable. The treatment time for cellulase treatment depends on the desired texture and strength, the cellulase concentration of the treatment solution, PH, treatment temperature, type of fiber to be treated, type of resin processing, etc., but it is usually 2 to 48 hours. It's time. Also, the processing temperature is usually 20
A range of ~60°C is preferable; if the treatment temperature is too high, the enzyme activity will decrease more quickly. The cellulose fibers treated with the cellulase treatment solution were treated with a 40-60°C aqueous solution containing 0.1-0.3% caustic soda and 0.3-0.7% sodium thiosulfate for 10 min.
After performing the immersion treatment for ~30 minutes, it is preferable to perform a post-treatment of washing with water and drying. (Example) A prepared 100% cotton plain woven fabric (40/1 x 40/1/90 x 75) was treated with a resin in the following manner. For resin processing, after padding the treatment solution, drying was performed at 150°C for 2 minutes, followed by dry heat treatment at 160°C for 3 minutes.

[Table] Meiselase (manufactured by Meiji Seika) was dissolved in M/10 acetate buffer (PH4.3) to prepare a 1.0% cellulase solution. This cellulase solution was impregnated into the above-mentioned resin-treated cloth and a non-resin-treated cloth for comparison, and after being squeezed to a 100% pick-up, it was wrapped around a stainless steel cylinder and wrapped in a moisture-impermeable film. The fabric was kept warm for several hours so that the weight loss rate of the entire treated fabric remained constant for each resin treatment. After this treatment, it was washed with water, dehydrated, and post-treated with caustic soda and sodium thiosulfate. Tear strength was measured using the JIS-L-1096D method (bendyulam method), and bending hardness was measured using the texture measuring machine KES-
Measured with FB2. The results are shown in Table 2.

[Table] As is clear from Table 2, compared to the resin-untreated fabric and the comparative untreated fabric, the processed fabric of the present invention has bending flexibility while suppressing a decrease in tear strength. Although resin-untreated fabrics have lower treatment temperatures and shorter treatment times, their tear strength is significantly lowered and they cannot withstand use as fabrics. (Effect of the invention) In the present invention, for a cellulose fiber structure,
A soft texture can be imparted while suppressing a decrease in tear strength. Furthermore, the softening effect of cellulase treatment is unique, and in addition to imparting bending flexibility, it also increases surface slippage, gloss, etc., and its range of applications has been significantly expanded.

Claims (1)

[Claims] 1. A cellulosic fibrous structure is pretreated with an aqueous swelling agent solution, the surface of the fibrous structure is treated with a resin that inhibits enzyme activity, and then treated with a cellulase enzyme. A method for producing a cellulosic fiber structure with improved texture. 2. The manufacturing method according to claim 1, wherein the cellulose fiber is cotton or regenerated cellulose fiber such as viscose rayon or Kyupura. 3. The manufacturing method according to claim 1, wherein the swelling agent is sulfuric acid, phosphoric acid, zinc chloride, or sodium hydroxide. 4 The resin that inhibits enzyme activity is melamine resin,
The manufacturing method according to claim 1, which is a glyoxal-based resin and a urea-formalin-based resin. 5. The manufacturing method according to claim 1, wherein the resin processing includes heat treatment at 100 to 170°C after applying the resin. 6 1 to 7 as solid content of resin to fiber structure
The manufacturing method according to claim 1, which gives weight %. 7. The production method according to claim 1, wherein the treatment with the cellulase enzyme is carried out by keeping the temperature at the activation temperature while preventing water evaporation.