JPS6140790B2 - - Google Patents

Description

[Detailed description of the invention]

[Detailed Description of the Invention] The present invention relates to a method for treating fabric. More specifically, the present invention relates to a method for treating a fabric containing cellulose fibers, the purpose of which is to impart wash-and-wear properties without reducing the strength of the fabric. When cellulose fibers are washed with water and dried, they become hard and wrinkled. Therefore, fabrics made of cellulose fibers cannot remain wrinkle-free and beautiful unless they are ironed after washing.
For this reason, cellulose fiber fabrics must be ironed after each wash. However, ironing clothes every time you wash clothes is a hassle. Therefore, even without ironing,
Attempts were made to improve it so that it could be worn as is. Fabrics that do not require ironing are said to have wash-and-wear properties because they can be worn immediately after washing with water. It is known that in order to impart wash and wear properties (hereinafter referred to as W-W properties) to fabrics made of cellulose fibers, they can be treated with a resin. There are several types of resins that can be used in that case. For example, N-methylol-based resins, urethane prepolymer and glyoxal-based resins, epoxy-based resins, and the like have been used so far. However, no matter which resin is used,
Fabrics obtained by resin processing have low tear strength and tensile strength, and in extreme cases have the disadvantage that they are easily torn like paper. Therefore, W-
It was hoped that a method for imparting W properties would emerge. It is known that in the conventional methods described above, the resin processing is mainly performed only on the surface of the fibers, resulting in a decrease in strength. That is, it is known that a decrease in strength occurs because resin processing is not uniformly applied to the inside of the fiber, but is applied locally only to the surface. Therefore, the idea was to perform some kind of surface treatment on the fibers before resin processing to reduce the hydroxyl groups in the cellulose molecules located on the surface of the fibers, thereby making it more difficult for the resin processing to occur later on the fiber surfaces. An attempt was made. However, previous attempts have had the disadvantage that surface treatment makes it difficult for the resin liquid to penetrate during subsequent resin processing, making it difficult to perform the subsequent resin processing smoothly. Therefore, until now, it has not been possible to impart WW properties without causing a decrease in strength. Therefore, the inventor attempted to develop a method for imparting WW properties without causing a decrease in strength. The inventors have discovered a pretreatment agent suitable for imparting WW properties to cellulose fibers without reducing their strength. It was confirmed that the drug should have two or more functional groups in the drug molecule that react with the hydroxyl groups of cellulose molecules, as well as a long-chain alkyl group and a hydrophilic group. The drug has, for example, at least two isocyanate groups blocked by bisulfite as functional groups in one molecule, and one alkyl group having 12 or more carbon atoms.
and one polyoxyethylene group as a hydrophilic group. It has been confirmed that when cellulose fibers are pretreated with this chemical and then subjected to conventional resin processing afterwards, WW properties can be imparted without reducing the strength of the cellulose fibers. This invention was made based on such confirmation. This invention is characterized in that one molecule contains one hydrophilic group consisting of a hydroxyl group, a carboxyl group, a sulfonic acid group or a salt thereof, or a polyoxyethylene group, and a carbon number
A fabric containing cellulose fibers is impregnated with a compound containing 12 or more alkyl groups and two or more functional groups consisting of a cyclic oxyethylene group or an isocyanate group, heat treated, and then treated according to a conventional method. It is characterized by applying resin processing to the cloth.
This invention relates to a method for treating fabric. In the method of this invention, the compound used in the initial treatment is a compound having two functional groups, at least one hydrophobic group, and at least one hydrophilic group in one molecule. . Among these, the functional group means a cyclic oxyethylene group or an isocyanate group. The hydrophobic group is a long chain alkyl group having 12 or more carbon atoms. The hydrophilic group means a hydroxyl group, a carboxyl group, a sulfonic acid group, or a salt thereof, or a polyoxyethylene group. Cyclic oxyethylene group is It means. To make a compound containing a cyclic oxyethylene group, for example glycidyl alcohol This can be made, for example, by ethering or esterifying it using The isocyanate group is -N=C=O, but for use in the process of this invention it is in the sodium bisulfite-capped form, i.e. It is desirable to use it in the form of These functional groups are present at the ends of the compound. Long chain alkyl groups are present in the compound in the form of alkyl amines or fatty acid esters or ethers. A long chain alkyl group is one having 12 or more carbon atoms. The long-chain alkyl group may have carbon atoms connected in a straight chain or may be branched. One or more long-chain alkyl groups may be contained in one molecule of the compound. The hydrophilic group consists of a hydroxyl group, a carboxyl group, a sulfonic acid group or a salt thereof, or a polyoxyethylene group. One or more of these hydrophilic groups may be contained in one molecule of the compound. The hydrophilic group may be located at the end or in the middle of the molecule of the compound. In the method of this invention, specific examples of the compounds used in the pretreatment have the following molecular formulas. R ₁ and R ₂ represent long-chain alkyl groups, and n ₁ , n ₂ , n ₃ and n ₄ represent positive integers. Among the above-mentioned compounds, many of the compounds containing a cyclic oxyethylene group as a functional group do not dissolve well in water. Therefore, in order to impregnate cellulose fibers with this compound, this compound is used after being dissolved in an organic solvent. As the organic solvent, benzene, methanol, trichlene, perchrene, etc. are used.
In addition, a catalyst is added to a compound containing a cyclic oxyethylene group as a functional group in order to cause the compound to react with a hydroxyl group in a cellulose molecule. The catalyst used is an alkali, such as caustic soda, or a borofluoride compound, such as zinc borofluoride. Among the above-mentioned compounds, compounds containing an isocyanate group as a functional group are generally highly reactive, so there is no need to add a special catalyst to react them with hydroxyl groups in cellulose molecules. Further, among isocyanate groups, compounds containing an isocyanate group blocked with bisulfite are generally soluble in water. Therefore, this compound is used as an aqueous solution. These compounds are used as 1 to 20% by weight solutions. Among them, 3 to 5 are preferable.
% solution by weight. Various methods can be used to impregnate cellulose fibers with this solution. For example, cellulose fibers can be immersed in a solution of the above compound, or an aqueous solution can be sprayed or coated onto the cellulose fibers. In any case, it is desirable that the solution stays only on the surface of the fibers, so it is not preferable to include too much solution. Therefore, if it is soaked, squeeze it out quickly with a mangle or the like. Furthermore, after impregnating the fibers with this compound, they are quickly dried. The above compound is added in an amount of 0.1 to 20% by weight based on the bone dry weight of the cellulose fiber. Drying is 80 to 100
℃, 2 to 10 minutes is appropriate. The appropriate heat treatment to be performed after drying is at 120 to 180°C for about 0.5 to 10 minutes. It is presumed that when heat-treated in this manner, the functional groups in the compound react with the hydroxyl groups in the cellulose molecules to form crosslinks in the cellulose molecules. As the cellulose fiber, a fabric made of this is used. Any fabric containing cellulose fibers can be used. For example, the fabric may be a blend or interweave of cotton and synthetic fibers. In fact, good results have been obtained with blended fabrics of cotton and polyester fibers. The fabric thus initially treated with the compound described above is then subjected to a resin treatment. This resin processing can be performed using conventional resin processing steps. That is, the resin used for processing is an initial condensation product of a resin containing an N-methylol group. These are, for example, early condensates of urea resins and also early condensates of melamine resins. The concentration of the initial condensate, the amount of impregnation, the subsequent heating temperature, etc. can all be determined by following known methods as they are. According to the method of this invention, a fabric containing cellulose fibers is first heat-treated with a compound having a hydrophobic group, a hydrophilic group, and a functional group, and then a conventional resin treatment is applied, which reduces the strength of the cellulose fibers. It is possible to impart WW properties to the fabric without causing any damage. This is thought to be an effect brought about because a compound having a functional group or the like is bonded to the hydroxyl group in the cellulose molecule, as described above. It is clear from the following comparison of Examples and Comparative Examples that there is little decrease in strength and that WW properties are sufficiently imparted. In Examples and Comparative Examples, the methods for measuring WW properties and strength are as follows. First, W-
W properties were measured according to JIS L1072 method A, tear strength was measured according to JIS L1096 method D (pendulum method), and tensile strength was measured according to JIS L1096A method (strip method). Example 1 In this example, a bleached cloth was used in which 123 threads of 40-count cotton were arranged per inch in the warp and 65 threads of 40-count cotton were arranged per inch in the weft. In addition, the compound (3) was used as the compound. First, a 10% aqueous solution of compound (3) was prepared, and the fabric was immersed in it, immediately pulled up, and squeezed with a mangle to a squeezing rate of 80%. The fabric was then immediately dried at 85°C for 2 minutes, followed by heat treatment at 160°C for 3 minutes. In this way, a pretreated fabric was obtained. Next, as a resin processing liquid, a urea resin initial condensate (manufactured by Sumitomo Chemical Co., Ltd., Sumitex Resin NS-
11) and 2.4% by weight of a curing catalyst (Sumitex Accelerator X80, manufactured by Sumitomo Chemical Co., Ltd.).
Using an aqueous solution containing 2% by weight and 2% by weight of a softener (Nitsuka Silicon AM, manufactured by NICCA Chemical Co., Ltd.),
The fabric was immersed in this aqueous solution, squeezed with a mangle to a squeezing rate of 80%, dried at 85°C for 2 minutes, and then heat-treated at 160°C for 3 minutes to perform resin processing. Thereafter, the fabric was washed with water and dried to obtain a treated fabric of the present invention. The WW properties and strength of this treated fabric were measured. For comparison, using the same type of fabric, compound (3)
Resin processing was performed in exactly the same manner as above, except that no pretreatment was performed, followed by washing with water and drying to obtain an ordinary resin-processed cloth. About this ordinary resin-treated cloth,
WW properties and strength were measured. The results are shown in Table 1 below.

[Table] This confirms that the treated fabric of the present invention has excellent WW properties and a small decrease in strength. Example 2 In this example, the fabric is made of 86 threads of 40 cotton threads per inch in the warp threads, and 40 threads of cotton threads in the weft threads.
A cotton lawn fabric with 80 threads per inch was used. In addition, the above compound (2) was used as a pretreatment compound. First, a 3% aqueous solution of compound (2) is prepared, the above fabric is dipped into this, immediately pulled up and squeezed with a mangle to a squeezing rate of 80%, and then immediately dried at 85°C for 2 minutes. , followed by heat treatment at 16°C for 3 minutes. In this way, a pretreated fabric was obtained. After that, resin processing was carried out using the usual method. As the resin processing liquid, 8% by weight of urea resin initial condensate (Super Betsucomin 311, manufactured by Dainippon Ink Co., Ltd.)
An aqueous solution containing 1.2% by weight of a curing catalyst (Catalyst FT, manufactured by Dainippon Ink Co., Ltd.) and 2% by weight of a softener (Nitsuka Silicon AM, manufactured by Nippon Kayaku Co., Ltd.) was prepared and used. The pretreated cloth was immersed in this aqueous solution, squeezed to a squeezing rate of 80%, intermediately dried at 85°C for 2 minutes, and then heat treated at 130°C for 3 minutes. This was washed with water and dried to obtain the treated fabric of the present invention. For comparison, a normal resin-treated fabric was obtained by resin-processing a fabric in exactly the same manner as above, except that the pretreatment with the aqueous solution of compound (2) was not performed. The WW properties and strength of these treated fabrics and resin-treated fabrics were measured. The results are shown in Table 2 below.

[Table] This confirms that the treated fabric of the present invention has excellent WW properties and has little decrease in strength. Example 3 In this example, the same cotton lawn fabric as in Example 2 was used. First, prepare a 3% dimethylformamide (hereinafter referred to as DMF) solution of the compound (1), dip the cloth in it, immediately pull it up, squeeze it with a mangle to a squeezing rate of 80%, and then immediately Cure this cloth at 160℃ for 3 minutes,
Then, it was washed with hot water and dried. Thereafter, resin processing was carried out in the usual manner. The resin processing liquid contained 8% by weight of a urea resin initial condensate (Sumitex Resin 901, manufactured by Sumitomo Chemical Co., Ltd.), and 1% by weight of a curing catalyst (Sumitex Accelerator X-80, manufactured by Sumitomo Chemical Co., Ltd.). Using an aqueous solution containing 6% by weight of fabric and 2% by weight of a softener (Nitsuka Silicon AM, manufactured by Nikka Kagaku Co., Ltd.), the above fabric was dipped in this aqueous solution, and the squeezing rate was 80% with a mangle.
Squeeze it out, dry it at 85℃ for 2 minutes, and then
Heat treatment was performed at 140°C for 3 minutes. This was washed with water and dried to obtain the treated fabric of the present invention. For comparison, a cloth was resin-treated in exactly the same manner as above, except that no pretreatment with the DMF solution of compound (1) was performed, to obtain an ordinary resin-treated cloth. Regarding these treated cloths and resin-treated cloths, W-W
The properties and strength were measured. The results are shown in Table 3 below.

【table】

Claims (1)

[Claims] 1 The molecule contains one hydrophilic group consisting of a hydroxyl group, a carboxyl group, a sulfonic acid group or a salt thereof, or a polyoxyethylene group, and an alkyl group having 12 or more carbon atoms, and the cyclic oxyethylene group is an isocyanate group. 1. A method for treating fabric, which comprises impregnating a fabric containing cellulose fibers with a compound containing two or more functional groups consisting of a group of 1 to 1, heat-treating the fabric, and then subjecting the fabric to resin treatment.