JPS58104273A - Resin processing of knitted fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for modifying a woven or knitted material containing cellulose fibers, and its purpose is to minimize the deterioration of the strong properties of the woven or knitted material containing cellulose fibers and improve the dry wrinkle recovery properties. , imparts wet wrinkle recovery properties and wash and wear properties.

Dry wrinkle recovery properties of woven and knitted fabrics containing cellulose fibers.

Various methods for imparting wet wrinkle recovery properties and wash and wear properties have been developed, and some have been put into practical use.

The most typical method is to apply a crosslinking resin to cellulose fibers, and then pre-dry them.

This method involves high-temperature dry heat treatment, but although this method improves dry wrinkle recovery properties, wet wrinkle recovery properties, and wash-and-wear properties, it has the disadvantage of a very large decrease in tenacity. Therefore, when putting it into practical use, it is either necessary to sacrifice some wash-and-wear performance to make it strong enough to cause no practical problems, or to make it strong enough for practical use by using high-strength raw cotton, yarn, or woven or knitted fabric. A method of retaining is applied. There are various theories about the mechanism behind this decrease in strength, but the most important reason is that crosslinking in an absolutely dry state drastically reduces the flexibility of the amorphous region of cellulose molecules, causing stress concentration and making it brittle. It is said.

Many studies have been conducted in the past to improve the basic defects of dry wrinkle recovery properties, wet wrinkle recovery properties, and wash and wear properties, but the most obvious improvement method is cellulose-based This is a method in which fibers are crosslinked in a state in which they contain a very small amount of water (semi-swollen state). For example, the Moist Cure method uses a crosslinking agent and mineral acid.

After pre-drying to a residual moisture content of 4 to 10%, batch-up and leave at room temperature for several hours to a day and night, crosslinking results in 1.
A cellulose fiber product with excellent wash and wear performance with little loss of strength can be obtained. However, since this method uses mineral acids, very slight variations in pre-drying can cause a large drop in strength and little improvement in drying recovery, making processing control difficult. 〃・For this reason, this method has not yet been put into practical use.

The present inventor aimed to eliminate the drawbacks of the conventional method described above.

As a result of intensive research, we have arrived at the method of the present invention which does not have these drawbacks. That is, in the present invention, when the wet pink-up of the woven or knitted material is 10 to 2 o-, the moisture content of the sold woven or knitted material is 4 to 10
s. A cross-linking agent for cellulose fibers is present in the treatment solution so that the cross-linking agent for cellulose fibers is 7% or more, and this is applied to a woven or knitted fabric containing cellulose fibers by wet pickup 1.
This is a resin processing method for a woven or knitted fabric containing cellulose fibers, which is characterized in that the woven or knitted fabric is treated in saturated steam at a temperature of 110 to 160°C without drying after being applied at a concentration of 0 to 20%. The feature of the present invention is that the amount of solid content in the treatment solution is reduced by using a much higher concentration of the crosslinking agent than is generally used, in order to increase the adhesion moisture content to 4 to 10% based on the weight of the cellulose fibers. In addition, the amount of the treatment liquid deposited (wet pickup) is also controlled, and after being applied to the cloth to be treated, the crosslinking reaction is carried out under conditions where water does not evaporate.

According to the method of the present invention, pre-drying can be omitted, high temperature dry wrinkle recovery properties, wet wrinkle recovery properties and wash and wear properties can be obtained, and the strength has been greatly improved compared to conventional methods. A processed product is obtained. Note that when the method of the present invention is carried out industrially, the productivity is inferior to that of the conventional method, since the continuous crosslinking reaction can be sufficiently effective in a short period of time. Of course, there are no drawbacks such as discoloration or decreased fastness.

The processing recipe in the present invention has a wet pickup of 10
% to 20% (based on the weight of the fabric to be treated), and adjust the concentration of the processing agent so that the solid content at that time is 9 to 15% (the solid content of the internal crosslinking agent is 7 to 12.5%) and the water content is 4 to 10%. It is important to determine the Namely.

If the moisture content is less than 4%, the strength reduction is so large that it is almost as good as the 9 conventional method, and if the moisture content is more than 10%, a high degree of dryness recovery cannot be obtained. A method in which the moisture content can be determined using a knob, such as the above-mentioned moist cure method, has the advantage of being simple and always yielding products of uniform quality. When imparting wash-and-wear properties to woven fabrics containing cellulose fibers, the solid content of the crosslinking agent is generally 6.5 to 7 inches, but in Kempo it is 7 inches.
~12.5 inches is used. The effect of using a crosslinking agent at a higher concentration than is generally used is not only to control the moisture content, but also to slightly moisten the cellulose and to lengthen the crosslinking members, thereby minimizing strength loss. It is in. It has been found from analysis that approximately 1 molecule is cross-linked when the resin is cross-linked using a normal resin processing method, but about 1.5 molecules are cross-linked using the method of the present invention. It has become clear that such long crosslinking reduces the strength loss. The processing agents used are N-methylolaminoplast resins such as dimethylol dihydroxyethylene urea (DMDHEU), dimethylol propylene urea (DMPU), and rimethylol melamine, or non-formaldehyde based compounds such as jepoxy compounds and divinyl sulfone compounds. Known crosslinking agents such as compounds are used, and inorganic metal salts are used as catalysts.

Organic acids, organic amine hydrochloride, and mixtures thereof,
Known catalysts such as alkaline catalysts are used, and other additives such as a texture regulator, a strength improver, a blowing agent, a foam stabilizer, and a penetrant are also used.

Wet pickup control uses a foaming method. This is because in order to uniformly adhere the wet pickup with a wet pickup of 10 to 20%, the wet pickup of 301 or higher, which is said to be the limit for uniformly depositing the volume of the treatment liquid to be applied, is preferably 301 or higher, and preferably the conventional wet pickup (60 ~100%). Foaming serves this purpose and can increase the volume and even out the adhesion. Foaming ratio Fi5 in this case
It is applied to the treated fabric by padding or double-sided coating at a magnification of ~30 times, preferably 7 to 20 times. The foaming ratio mentioned here is as follows.

Expansion ratio - weight of water with the same volume as the volume of foam ÷ weight of foam There is a need.

In order to exhibit catalytic action, high temperature conditions (120
As a result of research, it has become clear that the reaction can be carried out in a very short time at 110-160°C using saturated high-temperature steam.

Preferably, by steaming with saturated high-temperature steam at 120 to 140°C for 50 to 120 seconds to cause a crosslinking reaction, crosslinking can be performed while maintaining a controlled moisture content (semi-swollen state). It can provide dry wrinkle recovery properties, wet wrinkle recovery properties, and wash and wear properties.

The cellulosic fiber-containing woven or knitted fabric that can be applied to the present invention is a woven or knitted fabric made of cellulose fibers such as cotton, hemp, viscose rayon, polynosic, viscose cotton, or cuprammonium rayon.

The method of the present invention will be specifically explained below with reference to Examples.

Example 1 A coating machine was used to wet pick up 15 times the foaming ratio of 1 mouth of the treatment bath A and 15 times the foaming ratio of the heat treatment bath C (foamed in a screw foaming machine), which had been subjected to hair burning, removal, scouring, bleaching, and mercerization. Both sides were coated. Subsequently, without drying, the sample was treated for 120''Cxi minutes in a continuous steamer in the presence of saturated high-temperature steam to perform a crosslinking reaction of the crosslinking agent.

The cloth was then soaped and dried to obtain a treated cloth according to the method of the present invention. On the other hand, as a comparative example, a cloth was impregnated with a conventional treatment solution such as treatment baths 2 and 5 not shown in Table 2, squeezed so that the wet pickup was 70-, and pre-dried for 9
After carrying out the reaction at 0°C for 1 minute, a crosslinking reaction was carried out at 160°C for 2 minutes using dry heat, and the cloth was further soaked and dried to obtain a treated cloth according to the conventional method. In addition, both the fabrics treated by the present invention method and the conventional method were subjected to a final topping treatment with a softener and then subjected to physical property measurements. The performance of these treated fabrics is shown in Table 3. As is clear from Table 3, the method of the present invention has excellent wash and wear properties and a high strength retention rate.

Table 1 Treatment bath by the method of the present invention Idj[)af 01kl)son (*2)
q1% (*3) 46.8% (84) 1
00% Table 2 Treatment bath solid content by conventional method (*5) 50 cm (*6) 12% Example 1 A cloth of the same standard as the friend cloth used in Example 1 was used.

The treatment baths G and C according to the present invention in Table 4 with a foaming ratio of 12 times (foamed using a screw foaming machine) were coated on both sides with a wet pink up of 18 cm using a coating machine. Subsequently, without drying, the cloth was treated in a continuous steamer with saturated high-temperature steam at 130 DEG C. for 40 seconds to effect a crosslinking reaction of the crosslinking agent, followed by soaping and drying to obtain a treated cloth according to the method of the present invention. On the other hand, as a comparative example, conventional processing baths such as those shown in Table 5 were used, and processing was carried out in the same manner as in the conventional processing method described in Example 1. In addition, the treatment bath used was the same as in the conventional method, and the treated fabric was obtained by subjecting the cloth to a wet pickup of 70 degrees, and then carrying out a crosslinking reaction in saturated high-temperature steam for 2 minutes at 130° C. without drying. Table 6 shows the properties of these treated fabrics.

As is clear from Table 96, the method of the present invention has excellent wash-and-wear properties, and a) strong retention rate and bulk.9 The superiority of the method of the present invention is clear. Also, if the adhering moisture wheel is too high as in Le (moisture content in this case is about 619G), it will not only dry and recover easily.

Moisture wrinkle recovery was also only slightly improved, making it clear that control of moisture content is important.

Table 4 Isomorphic amount of treatment bath according to the method of the present invention (lit7) 80% (*8)
36m (*9) 25% (*12) 46.8-(*1
3) 100% Table 5 Solid content of treatment bath according to conventional method (10) 50% (*11) 25 cm (*
14) 56 cm (*15) 25 cm Table 6 Properties of treated fabric % Applicant Unitika Co., Ltd.

Claims (1)

[Claims] (1) When the wet pickup of the woven or knitted fabric is 10 to 20%, the moisture content in the woven or knitted fabric is 4 to 10%, and the crosslinking agent for cellulose fibers is added to the treatment solution so that the crosslinking agent for cellulose fibers is 7 or more. is applied to a woven or knitted fabric containing cellulose fibers at a wet pickup temperature of 10 to 20°C, and then the woven or knitted fabric is heated at 110 to 160°C without drying.
1. A resin processing method for woven or knitted fabrics containing cellulose fibers, characterized by processing them in saturated steam.