JPS5854078A - Production of modified cellulosic fiber - 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 Misfire 8A relates to a method for producing modified cellulose-based horizontal thin fibers, in particular a method for producing modified cellulosic fibers by resin processing with little reduction in abrasion resistance and strength.

Conventionally, the resin processing method for cellulosic fibers involves impregnating the fabric with a proper amount of resin liquid, pre-drying it to near absolute dryness, and then dry heat treatment to cause condensation of the resin and crosslinking between cellulose molecules due to the fat used. curing (hereinafter, the process of further condensation and crosslinking is referred to as "curing"), which imparts wrinkle resistance and shrink resistance to the fabric. However, when attempts are made to obtain satisfactory wrinkle resistance and shrink resistance using conventional resin processing methods, problems arise in that the abrasion resistance and strength of the fabric are significantly reduced and the texture becomes rough. These drawbacks cannot be avoided with conventional resin processing methods.To avoid all of these drawbacks, the selection of resin processing agents,
Attempts have been made to improve the catalyst and to use appropriate softeners and smoothing agents, but no results have been obtained to add f4.

On the other hand, inspection e-1 was also conducted from the viewpoint of resin processing conditions.
A method has also been proposed in which the decrease in wear resistance 1 strength is suppressed by allowing moisture to be present during curing. For example, at the start of curing, the total moisture content is 10 to 80% by weight, and curing is performed in superheated steam. So-called steam cure method.

Also, in a state where it contains 8 to 15 weight percent of water.

Leave to cure at 15-25°C for 6-18 hours. A so-called moist cure method is known. Both of these methods suppress the decrease in glue resistance 1 strength to some extent, but the shrink-proof properties and the durability of the wrinkle-proof properties are reduced, and satisfactory results have not been obtained.

In view of the current situation, the present inventors conducted a study in particular from the viewpoint of cutting force and working conditions, and found that 11. We discovered that the physical properties such as wear resistance changed significantly, and as a result of further investigation, we arrived at the present invention.1-
is.

The object of the present invention is to provide a modified cellulose fiber with very little reduction in abrasion resistance and strength, excellent wrinkle resistance, anti-shrinkage properties, and soft texture. .

The method for producing modified cellulose fibers according to the present invention includes:
After applying resin y to the cellulose fiber.

In the method for manufacturing modified cellulose fibers that undergo sizing by dry heat treatment, the water content of the cellulose fibers is 10 to 35% by weight at the start of the dry heat treatment. All characteristics are that at the end of heat treatment there should be no more than one layer of adhesion.

That is, one of the main points of the present invention is to specify the moisture content at the start and end of dry heat treatment, which has not been considered at all in the past, which could not be achieved by conventional methods. Improved shrink and wrinkle resistance, and wear resistance.

This method completely prevents the decrease in strength.Incidentally, in the conventional steam curing method and moist curing method, the water content at the end of curing is tj1. The former has a weight ratio of 4 to 5%, and the latter has almost no change, with a weight ratio of 8 to 15%.

In the present invention, cellulose fiber? Shima Momen.

Linen, viscose rayon, cuproammonium rayon, polynosic fibers, etc. are all good, even if they are simple, they are useless. It may be in a mixed form containing 30% by weight or more of these fibers. Also.

The form of the object to be processed may be any form commonly used in resin processing, such as a single thread woven fabric or a non-woven fabric.

Resin processing agent (4) used for resin liquid in the present invention For example, #, #'-dimethylol urea.

#,#'-dimethylolethylene urine L H,N'-dimethylolpropylene urine L #,#'-dimethyloldihydroxyethylene urine L H,N'-dimethyldihydroxyethylene and their modified derivatives However, the present invention is not limited to these resin finishing agents, and can be broadly applied to any condensation type or cellulose reaction type resin finishing agent.

In addition, in the present invention, the catalyst used in combination with the resin liquid is as follows:
One or more selected from organic amine hydrochlorides, organic acids, and acidic metal salts can be used. Also,
In addition to these, there are resin liquids.

A softener, a smoothing agent, a texture control agent, etc. can be used in combination as appropriate.

The term "contained water" as used in the present invention refers to the weight of water content based on the weight of the refined and bone-dried fibers, expressed as a percentage.

As a method of adjusting the moisture content to 10 to 35 mft% at the start of dry heat treatment, ego is applied after applying a resin liquid.

A method of pre-drying with reeds to reach a predetermined moisture content, or a method of pre-drying to absolute dryness and then adding moisture again to adjust the moisture content to a predetermined value.

A method is possible in which the resin liquid is applied at a low pick-up rate and the total water content is adjusted to 10 to 35% by weight when applying the resin liquid. However, if you perform preliminary drying.

It is preferable to carry out the heating at 140°C or lower. Pre-drying at temperatures above 140°C may cause the resin liquid to migrate to the fiber surface.9
This is because the abrasion strength is likely to be impaired since the resin becomes attached to the surface.

In the present invention, the moisture content at the start of the drying process is 10 to 3
It is necessary to have 5 weight t%. If the moisture content is less than 10% by weight, shrink-proofing and wrinkle-proofing properties can be obtained, but the decrease in 1 strength is large and the texture becomes rough and hard.

Moreover, if it exceeds 35% by weight, the resin liquid will migrate to the fiber surface during dry heat treatment, resulting in resin attached to one surface.

The strength improvement effect is small, and the shrink-proofing and wrinkle-proofing properties are poor.

In the method of the present invention, the dry heat treatment is usually 140 to 1 tO
The dry heat treatment is carried out at °C, but it is necessary that the moisture content at the end of the dry heat treatment is 1% by weight or less. Under dry heat treatment conditions in which the moisture content exceeds 1% by weight, the shrink-proofing properties and wrinkle-proofing properties are poor, and the washing resistance thereof is also poor.

The present invention'f will be explained below with reference to Examples.

Example 1 A 4-strand plain weave was made from refined 75 denier, 45 filament cup ammonium rayon yarn.

Sumitex Resin MS-IB<Sumitomo Chemical %N, N'-
Dimethylol dihydroxyethylene raw material compound) 17
0 t/l, Sumitex Accelerator X-80 (Sumitomo Chemical 31u) 51 V/l, AT-1500
It was completely impregnated with a resin solution consisting of G (Nicca Chemical System) 201/l and squeezed so that the pickup rate was 80%. Then pin this fabric all over using a tenter.

Dry for 20 seconds at 100°C. At this time, the moisture content of the dough was 18 tqb. This fabric was immediately placed in a curing pin tenter and dry heat treated at 150°C for 3 minutes so as not to change the moisture content.

Moisture content of fabric at the end of dry heat treatment 11. 0.5 weight t%
Met. Next, this fabric was passed through a gold-coated paper calender (γ) to undergo a soft cloth treatment.

For comparison, a fabric coated with a resin solution was dried at 1100°C for 1 minute in the same manner as in the above example. At this time, I was very impressed with the moisture content of the dough. This fabric was subjected to dry heat treatment in the same manner as in the example. The moisture content at the end of the dry heat treatment is 0.
It was 1%. This fabric was subjected to a soft cloth treatment in the same manner as in the example (Comparative Example 1).

Furthermore, as a comparison, fabric i was coated with a resin liquid in the same manner as in the example and the weight of the water content was adjusted to 18, and the temperature was 150°C.
1. Curing was carried out for 4 minutes in superheated steam at a relative humidity of 70%. The moisture content after curing was 5% by weight. This fabric was treated with soft cloth in the same manner as the actual sister example (Comparative Example 2).

Physical properties fl of each fabric obtained as described above [shown in Table 1].

Margin below (8) (9) Each was measured by

From the results in Table 1, it is clear that the present invention is superior to the conventional method (Comparative Examples 1 and 2).
) Extremely superior shrink-proofing and wrinkle-proofing properties.

It can be seen that the material has high abrasion strength and has excellent washing resistance of these physical properties.

Example 2 Using the same plain woven fabric as in Example 1, VC was applied in the same manner as in Example 1.
1! (Apply a fat liquid, then change the drying conditions to change the moisture content at the start of curing as shown in Table 2.)
Dry heat treatment was performed at 0'C for 3 minutes. The moisture content of the dough at the end of the dry heat treatment was as shown in Table 2. These fabrics were subjected to soft fabric treatment in the same manner as in Example 1.

In addition, as a comparative example, the water content at the start of dry heat treatment was
An 8% by weight fabric was subjected to dry heat treatment at 150'C for 30 seconds, and a fabric having a moisture content of 2% by weight at the end of the dry heat treatment was then subjected to soft fabric treatment in the same manner as in Example 1.

The physical properties of these fabrics are shown in Table 2.

fll) From the results in Table 2, if the moisture content of the fabric at the start of the dry heat treatment is less than 1ON, there is no effect of improving bending abrasion strength, and if it exceeds 35%, shrink-proofing and wrinkle-proofing properties are poor, and bending abrasion is reduced. It can be seen that the effect of improving strength is small. Reed. When the moisture content at the end of the dry heat treatment exceeds 1%, it is found that the shrink resistance and wrinkle resistance are poor, and the washing resistance thereof is poor.

Example 3 Plain woven fabric made of refined No. 40 single yarn cotton.

Neelamine TSL-58 (Mitsui Toatsu N,N'-dimethyldihydroxyethylene raw material compound) 4004/1.
Catalyst G (Mitsui Toatsu) lzor, 't, A7
'-1500G (manufactured by NICCA CHEMICAL) 53 flll, p
Using a kiss roll coater mangle,
It was given so that the pickup rate was 30%. At this time, the moisture content of the dough was 31%.

All of this fabric was subjected to dry heat treatment in the same manner as in Example 1, and then to soft fabric treatment. The moisture content of the fabric at the end of the dry heat treatment is 0.7 weight tons.
%Met.

For comparison, a fabric to which the entire resin solution had been applied was dried at 100°C for 30 seconds in the same manner as in the above example.

At this time, the moisture content of the dough was 4%. This fabric was dry heat treated in the same manner as all Examples. The moisture content of the fabric at the end of the dry heat treatment was 0.2%.

All physical properties of these fabrics are shown in Table 3.

From the results in Table 3 below, it can be seen that the present invention has extremely superior shrink-proofing properties, wrinkle-proofing properties, and tear strength compared to the conventional method (dry keel), and has excellent washing resistance of these physical properties. .

% permit applicant Asahi Kasei Industries, Ltd. patent application agent Patent attorney Akira Aoki Patent Attorney Kazuyuki Nishitate Patent attorney Yukio Uchida Patent Attorney Akiyuki Yamaguchi -48:

Claims (1)

[Claims] In a method for producing modified cellulose fibers, in which a resin solution is completely applied to cellulose fibers and then dicured by dry heat treatment, during the dry heat treatment. The moisture content of cellulose fibers is 10 to 10% at the start of dry heat treatment.
A method for producing a modified cellulose fiber, characterized in that the content is 35% by weight and 1% by weight or less at the end of dry heat treatment.