JPH06158546A - Production of water absorbing cloth - Google Patents

Abstract

PURPOSE:To raise the content of water absorbing collagen short fibers in a composite material at its maximum and to retain a composite material of a water absorbing collagen short fibers and urethane resin between napped fibers in water absorbing cloth wherein the composite material is formed on both sides of napped ground fabric. CONSTITUTION:A polyurethane elastomer is mixed with >=15% collagen short fibers modified with fish oil oxide and solid contents of the polyurethane elastomer and the collagen short fibers modified with fish oil oxide are made >=10% to give a processing solution, in which cotton fabric comprising both sides napped in >=7mm is immersed and the composite material is reacted and fixed in water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a water-absorbing composite material having excellent water-absorbing properties.

[0002]

2. Description of the Related Art Conventionally used chamois leather has a good water absorption property, but its drainage property is significantly inferior to that of cotton cloth. Further, chamois leather is tanned with an oxide of fish oil, but it is complicated to infiltrate the fish oil into the skin tissue or adjust the degree of oxidation of the oil. Modified collagen fibers by oxidation of fish oil, which are excellent in water absorption and oil absorption, are known. (Hiroshi Okamura Kunio Shirai: Leather Chemistry Vol. 23 15
-19, 1977).

The present inventor has proposed Japanese Patent Application No. 2-53996 for the purpose of imparting water absorbency to a double-sided woven fabric made of synthetic fibers having a low water-absorbing ability by utilizing the modified collagen short fibers having a high water-absorbing ability. This manufacturing method, for polyurethane elastomers,
15% w of denatured collagen short fibers modified with fish oil oxide
It is compounded as t or less, and buffing is performed on both surfaces of the base fabric in the finishing step to form a suede-like appearance. The water absorption of this water absorbent cloth was less than the theoretical value calculated from the mixed modified collagen short fibers, and the water absorption rate was not superior to that of the commercially available water absorbent cloth.

[0004]

[Problems to be solved] When the cause of this problem was examined, denatured collagen short fibers were laminated on the surface of the base fabric to form a composite material with the polyurethane elastomer, and almost never reached near the cloth base fabric. It was confirmed that the content of the water-absorbed modified collagen fiber in the product was remarkably low, because a part of the water-absorbent composite material in the surface layer was removed by the finishing buffing after the impregnation. The present invention provides a method for producing a cloth capable of increasing the content of denatured collagen short fibers in the product cloth by a factor of 2 or more.

[0005]

According to the present invention, a water-absorbing modified collagen short fiber chemically modified with fish oil oxide is blended in a dimethylformamide solution of polyurethane elastomer in an amount of 15% by weight or more with respect to the polyurethane elastomer, and the solution is added. After adjusting the solid content of the above to 10% or more to prepare a working liquid, a thick plain woven cotton cloth raised at least 0.7 mm on both sides is immersed in the working liquid and reacted and fixed in a water tank, It is washed with water and dried to obtain a product. In the production of the modified collagen short fibers used in the present invention, when the floor skin is repaired with an oxidized oil of fish oil, the collagen fiber is first covered with an oil film, and the oxidation of the fish oil is in the presence of water. Done in. At the same time, the product, a higher aldehyde, reacts with and binds to the skin. In this case the oil must penetrate into the central layer of the rawhide.
The present invention is to hold the flexible layer of the composite material consisting of the water-absorbent modified collagen fiber and the polyurethane resin on the napped fibers on both sides of the base fabric, or the napped fiber length is better,
From the results of the experiment, it is set to 0.7 mm or more. Further, the blending ratio of the modified collagen short fibers to the polyurethane elastomer is about 10 to 25% wt, preferably 15 to 20% wt with respect to the polyurethane elastomer solid matter, and the solid concentration of the impregnating liquid is about 10 to 16% wt. To do.
This condition is necessary in order to mix the modified collagen short fibers in the water-absorbent composite material in a large amount. It is also necessary not to apply a finishing buff treatment after impregnation.

[0006]

【Example】

(A) Preparation of Modified Collagen Fiber The modified collagen fiber used in the present invention is intended to produce a water-absorbent cloth as a composite material with a polyurethane elastomer, and therefore mechanical strength need not be considered. Therefore, North American salted hide (stairhide, average 64
Lbs) using the head and adjacent parts obtained from Lbs, after a short time of recalcification (2 days) and oxygen treatment,
By re-calcining again, the collagen fibers are sufficiently separated and purified. (1) Separation and Purification of Collagen Fibers Naked skins are immersed in saturated lime water (2% lime milk 28 ° C.) for 2 days, and then washed with water for 30 minutes. Next, based on the weight of the bark before washing with water, the mixture was rotated in a drum for 30 minutes with 3% ammonium chloride and 200% warm water (35 ° C), and after complete decalcification, Bacillus subtilis protease was used as a casein digestive power for 1 g of cortical matter Add 80 Pu and allow to work in drum for 4 hours. Then, it was immersed again in saturated lime water (2% lime milk, 28 ° C.) for 2 days to separate and purify the collagen fibers, and then a complete decalcification treatment with ammonium chloride was performed. (2) Forimarin treatment For the above-mentioned floor skin, the drum was rotated for 5 minutes with 150% of its weight of water and 5% of sodium chloride, a 2% amount of formalin solution was diluted with 10 times water, and 10 minutes interval Was added in three times. Then, the drum was rotated for 6 hours, and an appropriate amount of sodium carbonate was added to adjust the solution to pH 8.5. It was further rotated for 2 hours, immersed in a drum for about 10 hours, and then washed with running water for 10 minutes. (3) Debunching treatment After removing the formalin-treated floor skin by centrifugal dehydration,
While rotating in a mesh drum, warm air (38 to 42 ° C.) was passed through to semi-dry the water to about 45%. This semi-dried product was passed through a debunker to mechanically separate the fiber entanglement. (4) Remediation treatment with fish oil oxide Based on the weight after completion of the debinding treatment, 200% water, 10
% Oxidized fish oil and 20% cod oil, 0.5% sodium carbonate and 10% oleic acid, 1% copper oleate based on the weight of the cod oil, mixed in a drum (6r.
p. m. ) Rotated for 6 hours. The cod oil had an iodine value: 134.6, an acid value: 3.4, and an unsaponifiable matter: 2.1. Fish oil oxide is 8 parts by weight of fish oil (cod oil).
% Oleic acid and 0.5% copper oleate are added, and moist air is passed for 24 hours at 60 ° C. for oxidation to oxidize the peroxide value to 2
It contains 418 meq / Kg. After the completion of the drum treatment, it was dried by air drying. Based on this dry weight, 1000% warm water (40 ° C.), 4% sodium carbonate, 1% nonionic activator were rotated in a drum for 2 hours, followed by washing with water for 30 minutes and subsequent centrifugal dehydration.
The dehydrated product was prepared by using a device modified from a small-sized opener, and performing beating and drying at the same time to adjust the water content to 30% to 40%, and then immediately passing through defiberized fiber to obtain denatured collagen fiber. (B) Manufacture of cloth Thick plain-woven cotton cloth (weight of 230 g, width of 95 cm, thickness of 0.
Both sides of the fabric (8 mm) were subjected to a raising treatment of 0.5 mm or more. Polyurethane elastomer (TDI type) is dissolved in dimethylformamide, and the above-mentioned modified collagen short fiber is 20% w based on the weight of polyurethane elastomer.
The amount of t was gradually mixed and stirred. 10 ~ this mixed processing fluid
Dimethylformamide was added to the solution to prepare a 15% solids solution, which was then impregnated into the above base cloth and passed through a squeeze roll, and finally the resin adhesion amount was set to 4 with respect to the base cloth weight.
It was prepared by squeezing so as to be 0 to 45% (weight). Then, it was introduced into a reaction water tank, and the urethane / denatured collagen fiber composite was fixed to the base cloth. Subsequently, it was washed with water in a water tank, and after adding a softening agent, it was washed with warm water and milled. The processed cloth thus treated is dried to obtain a water-absorbent cloth without being subjected to buffing. This product had a finished width of 93 cm, a basis weight of 330 g and a thickness of 1.03 mm. The physical properties measured by leather (JIS K 6554 for clothing leather) (40 × 20 cm ² , 10 samples, horizontal axis direction) are tensile strength: 0.72 ± 0.06 kgf / mm ² Elongation at break: 54.6 ± 4.2% Tear strength: 3.74 ± 0.27 kgf / mm Bending resistance: 201.5 ± 8.4 mgf.

[Comparison Test of Water Absorption, etc.] The water absorbent cloth of the present invention and the water absorbent / water retentive flexible cloth subjected to double-sided buffing (Japanese Patent Application No. 2-53).
The results of comparing 996) are shown in the table. However,
Both of them were made of cotton plain weave, and the mixed amount of denatured collagen short fibers was 20% wt.

[0007]

[Table 1]

The water absorption was measured by immersing a rectangular sample piece of 40 × 100 mm ² in distilled water for 30 minutes (20 ± 2 ° C.), and determining the weight difference between the test piece before and after immersion in% of the weight before immersion. This was defined as the water absorption (A). After the immersion, it was dehydrated by centrifugation (3000 rpm), the weight was measured, and the% to the weight of the sample piece before immersion was calculated to be the water absorption (B). The water absorption rate was measured by the Bayrex method. That is, 30 × 180 in distilled water at 20 ± 2 ° C.
Immerse a 15 mm (vertical) sample piece from the bottom edge for 15 mm and
The rising height of water in 0 minutes was measured. The measurement was performed 10 times, and the average value and standard deviation were shown. Further, each cloth was divided into 3 layers, the central layer was removed, shredded and immersed in pyridine, the denatured collagen and the base cloth were separated and purified, and then washed with acetone and distilled water. JI with filter paper
The cortical content was measured by SK 6550, and the content of denatured collagen short fibers with respect to the anhydride was calculated.

[0009]

[Effect] The water-absorbent cloth of the present invention is superior in water absorbency (A) by 1.5 times and water-absorbing rate by 1.8 times in comparison with the conventional buff-treated water absorbent cloth. . This has a modified collagen short fiber content of 2.
It is considered that this is because it is contained 6 times as much, and it can be expected as a new water-absorbent composite cloth.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location D06M 15/70 23/08 // D06C 11/00 A D06M 101: 16 D06M 15/564 15/70 7199-3B 21/02

Claims (1)

[Claims] 1. A solution of polyurethane elastomer in dimethylformamide is admixed with 15% by weight or more of water-absorbing modified collagen short fibers chemically modified with fish oil oxide with respect to the polyurethane elastomer, and the solid content of the solution is 10%. The processing liquid was adjusted as described above, and a thick plain woven cotton cloth raised at least 0.7 mm on both sides was dipped in the liquid to react and fix in a water tank, followed by washing with water and drying. A method for producing a water-absorbent cloth, which is characterized.