JPH08127972A - Method for processing cellulose-based fiber fabric - Google Patents

Abstract

PURPOSE: To provide a processing method capable of providing excellent easy care property, permanent press property, shrinkage resistance and puckering property, pleats-retaining property, etc., to fabric containing a cellulose-based fiber or its sewn product. CONSTITUTION: A water-soluble urethane prepolymer and a compound having a free nitrogen group capable of reacting with formaldehyde are applied to fabric containing a cellulose-based fiber and then, the fabric is heat-treated at a temperature higher than a thermally dissociating temperature of a thermal dissociation type blocked isocyanate group to polymerize the polymer and then, the water content is uniformly controlled to 1-50% in the sewn product and the sewn product is subjected to vapor phase processing using formaldehyde and heat-treated and cross-linked. A prepolymer having thermal dissociation type blocked isocyanate groups at the ends and an alkyl oxide group on a main chain is preferably used as the water-soluble urethane polymer. Urea, dicyandiamide, ethyleneurea, propyleneurea, etc., is used as the free nitrogen- containing compound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for imparting easy-care property, permanent press property and shrink-proof property to a fabric containing cellulosic fibers or a sewn product thereof.

[0002]

2. Description of the Related Art Cellulose fiber cloth is subjected to a gas phase process using formaldehyde gas, and by cross-linking formaldehyde between cellulose molecules of the fiber, the cellulose fiber cloth is easy-care (wash and wash).
It has been publicly known to impart wearability) and is generally performed. However, when it is attempted to impart sufficient easy-care performance, permanent press performance and shrink-proof performance to the cloth by this method, there is a problem that the strength of the cellulosic fiber is excessively reduced.

Further, after applying a water-soluble urethane prepolymer having a thermal dissociative blocked isocyanate group at the terminal and an alkylene oxide group in the main chain to a fabric containing cellulosic fibers, There is also a method of imparting easy-care performance while preventing a decrease in strength by subjecting the water-soluble urethane prepolymer to heat treatment at a temperature above the thermal dissociation temperature to polymerize the water-soluble urethane prepolymer and then subjecting it to vapor-phase processing with formaldehyde. In this case, it was difficult to say that the easy-care performance was absolutely satisfactory even though the strength was maintained. This tendency becomes particularly remarkable when the fabric weight is 200 g / m ² or less and the mixing ratio of the cellulosic fibers is 50% or more.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has excellent easy care performance and permanent press performance while suppressing a decrease in strength of a fabric containing a cellulosic fiber as much as possible. The first purpose is to obtain a processing method that imparts shrink-proof performance. The present invention also provides a processing method for imparting excellent shape retention, puckering, and pleating retention to a sewn product of a fabric containing a cellulosic fiber, while suppressing its strength reduction as much as possible. Is the purpose of.

[0005]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, the present invention provides a cloth containing cellulosic fibers with a water-soluble urethane prepolymer having a thermally dissociated blocked isocyanate group at the end and an alkylene oxide group in the main chain and a free nitrogen group capable of reacting with formaldehyde. After the addition of the compound having the above, the water-soluble polyurethane prepolymer is polymerized by heat treatment at a temperature higher than the thermal dissociation temperature of the thermal dissociation type blocked isocyanate group, and then, if necessary, a sewn product is formed. The moisture content of the fabric is 1 to
A method of processing a cellulosic fiber cloth is characterized in that it is uniformly adjusted to 50%, and after that, the cloth is subjected to vapor phase processing with formaldehyde that adsorbs formaldehyde gas and heat-treats to crosslink the cloth. Hereinafter, the present invention will be described in detail.

The cloth containing cellulosic fibers as referred to in the present invention means a woven fabric, a knitted fabric, a non-woven fabric, or a mixture of one or two or more fibers made of normal cellulose such as cotton, hemp and rayon. It means a woven fabric or a knitted fabric which is a mixture of fibers and synthetic fibers such as polyester, polyamide and polyacrylonitrile (mixed spinning, mixed fiber, mixed weaving, mixed knitting). Of course, cellulosic fiber 10
The cloth may be 0%. The present invention is effective for any of the above-mentioned fabrics, but especially the basis weight is 200 g / m 2.
The effect of the present invention is remarkably exhibited on a fabric having a mixing ratio of cellulosic fibers of ² or less and 50% or more.

In the method of the present invention, first, the above-mentioned cloth has a water-soluble urethane prepolymer having a thermally dissociative blocked isocyanate group at the end and an alkylene oxide group in the main chain and a free nitrogen group capable of reacting with formaldehyde. Apply the compound. As the water-soluble urethane prepolymer having a thermally dissociated blocked isocyanate group at the terminal and an alkylene oxide group in the main chain, it is preferable to use one having a molecular weight of 1,000 to 100,000.

The heat-dissociative blocked isocyanate group constituting the water-soluble urethane prepolymer has free isocyanate blocked with sodium bisulfite, phenol, active methylene compound, lower alcohol, lactam, etc., and heated to 100 to 180 ° C. By doing so, the blocking agent dissociates, the isocyanate group is regenerated, and the isocyanate group subsequently reacts to become a polymer. The alkylene oxide is composed of polyethylene oxide, polypropylene oxide, or the like, which imparts water solubility to the prepolymer and imparts permeability to the cellulosic fibers.

Examples of the compound having a free nitrogen group capable of reacting with formaldehyde include urea, a compound having an amide group such as dicyandiamide, ethylene urea, propylene urea, 2-pyrrolidone, 2-oxooxalidine, pyrrole, imidazole, Examples thereof include nitrogen-containing heterocyclic compounds such as 1-methylimidazole, 1,2,4-triazole and indole.

In order to apply the above resin to the cloth, the urethane prepolymer and the compound having an amino group are dissolved in water and, if necessary, the cloth is impregnated with an aqueous solution containing a catalyst and a softening agent. ,dry. Practically, it is preferable to control the amount of adhesion with a padder, coater or the like to apply.

After the resin is applied, in the present invention, the water-soluble polyurethane prepolymer is polymerized by heat treatment at a temperature not lower than the thermal dissociation temperature of the thermal dissociation type blocked isocyanate group. The heat treatment temperature in the polymerization reaction is 100 to 180 ° C.
However, it is more preferably 130 to 150 ° C. If the reaction temperature is lower than 130 ° C, dissociation of the blocking agent does not occur and the polymerization becomes insufficient, which is not preferable.
On the other hand, if the temperature exceeds 180 ° C., the polymerization is sufficient, but the fabric is yellowed and the whiteness is lowered, which is not preferable.

After that, a sewn product is formed if necessary.
Sewing may be performed by a usual method.

In the present invention, the moisture content of the cloth is set to 1 to 5 here.
Adjust evenly to 0%. At this time, the moisture content of the fabric is 1 to
It should be 50% and the moisture should be evenly distributed in the dough. If the moisture content of the dough is less than 1%, the formaldehyde gas used in the next step will not be sufficiently adsorbed to the dough, and if it exceeds 50%, the acid catalyst may cause embrittlement of the dough. Be careful. In addition, if moisture is not evenly distributed in the dough, formaldehyde gas will not be adsorbed uniformly. Any means may be used to uniformly control the water content, but it is usually preferable to leave the cloth or sewn product in a constant temperature and constant humidity chamber for 24 hours or more.

After the moisture content is adjusted, in the present invention, the fabric is subjected to a vapor phase processing with formaldehyde which adsorbs formaldehyde gas and heat-treats it to crosslink it. In the vapor phase processing, a vapor phase processing apparatus having an atmospheric pressure closed reaction chamber, a formaldehyde gas supply means, and a heating means can be used. In this case, ATP (American Textile
It is also possible to use a vapor processing apparatus manufactured by Processing Co.). The formaldehyde gas concentration in this vapor phase processing apparatus is preferably in the range of 1 to 20%, and if it is 1% or less,
Even if the cross-linking reaction becomes insufficient and it exceeds 20%, the effect cannot be further improved.

The catalyst used for the cross-linking reaction may be subjected to a gas phase treatment after padding the fabric with the catalyst solution in advance, or the catalyst solution or the liquefied catalyst may be vaporized or mist to be adsorbed on the fabric. You may let me. Regarding the type of catalyst, when padding is performed in advance, the same catalyst as used in conventional resin processing, for example, a metal salt of an acid such as zinc nitrate, a Lewis acid, a Bronsted acid, or the like can be used. Further, when vaporizing, a volatile acid having a low boiling point such as hydrogen chloride is desirable.

The catalyst concentration is preferably 0.1 to 3.0% when treated with gas. If the gas concentration is less than 0.1%, the crosslinking reaction will be insufficient, and even if it exceeds 3.0%, the effect will not be further improved and the fabric strength will be excessively reduced. When the catalyst is padded with an aqueous solution and applied, the catalyst concentration is 5 to 100 g.
The range of / liter is desirable. When the concentration is less than 5g / liter, the crosslinking reaction becomes insufficient, and 100g
Even if it exceeds liter / liter, the effect is not improved further, and the fabric strength is excessively reduced.

After adsorbing the formaldehyde gas, the cloth or its sewn product is heat-treated to carry out a crosslinking reaction. The heat treatment at this time is performed at a temperature in the range of 100 to 180 ° C.
The crosslinking reaction can be completed by performing the treatment for 5 to 10 minutes. The present invention has the above configuration.

[0018]

When the cellulosic fiber is impregnated with the water-soluble urethane prepolymer and the compound having an amino group and polymerized as in the present invention, the cellulosic fiber reacts with the urethane polymer and formaldehyde in its relatively large amorphous region. When the amorphous region is protected by filling with the obtained compound having a free nitrogen group and vapor phase processing with formaldehyde is performed in such a state, the formaldehyde reacts with the urethane polymer and the compound having a free nitrogen group in the urethane polymer. As it cross-links with cellulose as a cross-linking agent with a longer molecular chain, there is room for relaxation, and as a result, there is little reduction in strength, and excellent easy-care properties, permanent press properties, and shrink resistance are obtained.

[0019]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples. The measurement and evaluation of samples in Examples were carried out by the following methods. However, with respect to the following (2) to (7), a sample that was drip-dried after 5 times of washing according to JIS L-0217 (103 method) was used.

(1) Tear strength JIS L-1096 (2) Permanent pressing property JIS L-1096 (3) Easy care property AATCC-124 (4) Shrinkproof property JIS L-1096

(5) Shape retention AATCC-124 (6) Puckerability AATCC-88B-1964T (7) Pleated retention JIS-1096

Example 1 Broad fabric made of 100% cotton fabric (80 s for both warp and weft)
/ 2, basis weight 150 g / m ² ) is prepared, subjected to normal scouring, bleaching, and mercerizing, then immersed in an aqueous solution of the following formulation 1 with a padder, padded with a pickup of 60%, and dried at 110 ° C. Then, heat treatment was performed at 160 ° C. for 2 minutes.

Formulation 1 Elastron MF-9 10.0% (water-soluble urethane prepolymer, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) Elastron catalyst 64 0.5% (tin chloride catalyst, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) Urine 10.0% Vicron 55R 3.0% (fatty acid amide type texture modifier, made by Yansha Yushi Co., Ltd.) PORON MF-5 2.0% (silicone type texture regulator, Shin-Etsu Chemical Co., Ltd.) ) Leperon OPC 2.0% (Polyolefin type texture modifier, Satoda Kako Co., Ltd.)

By leaving this cloth in an environment chamber at a temperature of 20 ° C. and 65% RH, the moisture content is adjusted to 8.0%,
Subsequently, vapor phase processing was performed as follows using a vapor phase processing apparatus having a stainless steel reaction chamber having a width of 2 m, a length of 3 m and a height of 2 m. First, put the cloth in the processing device and seal it, and then supply the formaldehyde aqueous solution to the room for 1.5 minutes through an injector and a steam conduit with steam of 1.2 kg / m ² and 105 ° C. to obtain 2400 g of formaldehyde aqueous solution. Was injected. Then, 6.8 kg of sulfurous acid gas was injected, and after soaking for 2 minutes, free formaldehyde and sulfurous acid gas not retained by the fabric were exhausted, and the room temperature was raised to 127 ° C. A cloth was obtained.

For comparison with the present invention, a processed fabric for comparison (Comparative Example 1) was obtained in the same manner as in this Example except that urea was omitted from Formulation 1 in Example 1.

The performances of the present invention and the processed fabric for comparison were measured and evaluated, and the results are shown in Table 1.

[Table 1]

As can be seen from Table 1, the processed fabric according to the present invention has little strength reduction and has excellent performances in easy care property, permanent press property and shrink resistance.

Example 2 In the above Example 1, except that the dress shirt is formed by sewing the cloth after the processing according to the recipe 1 and before adjusting the moisture content,
The sewn products for the present invention and for comparison (Comparative Example 2) were obtained in exactly the same manner as in Example 1.

The performances of the present invention and the comparative sewn product were measured and evaluated, and the results are shown in Table 2 together.

[Table 2]

As is clear from Table 2, the sewn product produced by the method of the present invention showed a small decrease in strength and had excellent properties in form stability, puckering and pleating retention.

[0031]

EFFECTS OF THE INVENTION According to the method of the present invention, as compared with the gas phase processing using formalin which is generally performed, in the case of a fabric, a sufficient permanent pressing property can be obtained while sufficiently suppressing the decrease in the fabric strength. It can provide easy-care property and shrink-proof property, and in the case of sewn products, it can provide sufficient shape stability, puckering property, and pleated retention property.

Claims (1)

[Claims] 1. A water-soluble urethane prepolymer having a thermally dissociative blocked isocyanate group at its terminal and an alkylene oxide group at its main chain, and a free nitrogen group capable of reacting with formaldehyde, in a cloth containing cellulosic fibers. After applying the compound, the water-soluble polyurethane prepolymer is polymerized by heat treatment at a temperature higher than the thermal dissociation temperature of the thermal dissociation type blocked isocyanate group, and then a sewn product is formed if necessary. Moisture content 1-5
A method for processing a cellulosic fiber cloth, which comprises uniformly adjusting the content to 0%, and then performing vapor phase processing with formaldehyde that adsorbs formaldehyde gas on the cloth and heat-treats it to crosslink it.