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Water soluble vinylon and non-woven cloth containing the same vinylon

A polyvinyl alcohol-based, water-soluble technology, applied in the direction of fiber chemical characteristics, dry spinning method, wet spinning method, etc., can solve the problems of reducing stretching temperature or stretching ratio, constraints, and inability to increase fiber crystallinity, etc., to achieve The effect of cheap manufacturing

Inactive Publication Date: 2005-07-13
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to develop non-woven fabrics using fibers that can be dissolved at lower temperatures, non-woven fabrics using PVA-based fibers with a low degree of saponification have been proposed (for example, refer to Patent Document 6), but due to the use of PVA-based polymers with a low degree of saponification , so that the crystallinity of the fiber cannot be improved, so although the non-woven fabric containing the fiber has excellent low-temperature solubility, its mechanical properties are low, and its practical use is restricted.
[0009] On the other hand, in order to improve the mechanical properties of non-woven fabrics, non-woven fabrics made of fibers made of PVA-based polymers with a high degree of saponification and a high degree of polymerization as raw materials increase the crystallinity of the fibers, so the tensile strength, etc. The mechanical properties become sufficient, but the water dissolution temperature becomes 120°C or higher, and the water solubility at low temperature is impaired
As a method of improving water solubility using such a PVA-based polymer, for example, by extremely lowering the stretching temperature or the stretching ratio, thereby deliberately inhibiting the orientation crystallization, but this method naturally lowers the crystallinity, and the fiber composed of such Non-woven fabrics have the problem of impaired mechanical properties

Method used

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  • Water soluble vinylon and non-woven cloth containing the same vinylon
  • Water soluble vinylon and non-woven cloth containing the same vinylon
  • Water soluble vinylon and non-woven cloth containing the same vinylon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] (1) PVA having a viscosity average degree of polymerization of 1700 and a degree of saponification of 96.0 mol % was added to DMSO so that the PVA concentration was 23% by mass, and dissolved by heating at 90° C. under a nitrogen atmosphere. The obtained spinning stock solution was passed through a nozzle with a hole diameter of 0.08 mm and a number of holes of 108, and dry-wet spinning was carried out in a solidification bath composed of methanol / DMSO=70 / 30 (mass ratio) at a liquid temperature of 5°C.

[0094] (2) The obtained cured yarn was immersed in a second bath having the same methanol / DMSO composition as the curing bath, and then wet stretched three times in a methanol bath at a liquid temperature of 25°C. Thereafter, it was immersed in a methanol bath (extraction bath) in which 10 g / l of glyoxylic acid manufactured by Wako Pure Chemical Industries, Ltd. was dissolved, and then dried with hot air at 120° C. to obtain a spinning yarn. Next, the obtained spinning ...

Embodiment 2

[0101] (1) A fiber was obtained by spinning and drawing under the same conditions as in Example 1, except that 50% of the carboxylic acid portion of glyoxylic acid was neutralized with sodium hydroxide. The performance evaluation results of the obtained fibers are shown in Table 1. In the obtained fiber, the reactivity of glyoxylic acid was 0.8 mol%. In addition, the fiber physical properties of the obtained fiber are: single filament fineness 2.1dtex, fiber crystallinity Xcf=43%, water dissolution temperature Wtb=15°C, fiber strength 7.6cN / dtex, fiber crystallinity Xcf and water dissolution temperature Wtb The relationship between satisfies the condition of formula (I), so the appearance of the fiber is good, without silk spots, etc., which is better than the conventional water-soluble PVA-based fiber.

[0102] (2) The fibers obtained in the above (1) were subjected to heat embossing treatment under the same conditions as in Example 1 to obtain a nonwoven fabric. Table 3 sh...

Embodiment 3

[0105] (1) A fiber was obtained by spinning and drawing under the same conditions as in Example 1, except that PVA having a degree of saponification of 88 mol % was used. The performance evaluation results of the obtained fibers are shown in Table 1. The fiber appearance that obtains is good, does not have silk spots etc., and monofilament fineness is 2.1dtex, and fiber strength is 3.6cN / dtex, and the crystallinity Xcf=32% of fiber, dissolves temperature Wtb=5 ℃ in water, and the crystallinity Xcf of fiber and water The relationship of the dissolution temperature Wtb satisfies the condition of formula (I).

[0106] (2) Except having made the embossing temperature 140 degreeC, the fiber obtained by said (1) was heat embossed under the same conditions as Example 1, and the nonwoven fabric was obtained. Table 3 shows the evaluation results of the obtained nonwoven fabric. The weight per unit area of ​​the obtained nonwoven fabric was 41 g / cm 2 , Dissolving temperature in water...

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Abstract

Provided are water-soluble PVA fibers having practicable fiber properties such as good mechanical properties and chemical resistance not detracting from their original water-solubility, and a water-soluble nonwoven fabric comprising the fibers. The nonwoven fabric also has practicable properties such as good mechanical properties and chemical resistance, and has many applications, for example, for base fabrics for chemical lace. The water-soluble PVA fibers are reacted with from 0.01 to 5 mol% of an ionic group-having compound and satisfy the following relational formula in which Xcf (%) indicates the degree of crystallinity of the fibers and Wtb (DEG C) indicates the dissolving temperature in water of the fibers: Wtb < 2.50Xcf-70, wherein 30% ≤ Xcf ≤ 80%.

Description

technical field [0001] The present invention relates to water-soluble polyvinyl alcohol (hereinafter abbreviated as PVA)-based fibers and non-woven fabrics containing the fibers, which do not impair the existing water-solubility and have sufficient fiber properties such as mechanical properties and chemical resistance for practical use. Cloth can be used extremely effectively in many applications including base fabrics for chemical lace. Background technique [0002] In the past, as water-soluble fibers, PVA-based fibers, cellulose-based fibers such as carboxymethyl cellulose, polyalginic acid-based fibers, polyalkylene-based fibers, etc. have been known. Only PVA-based fibers are required for non-woven fabrics such as needle punching, textiles such as weaving, or knitting processes that require excellent mechanical properties and chemical resistance. In addition, in recent years, there is a strong desire to protect the global environment and protect consumers. It is clearl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/14D01D5/04D01D5/06D04H1/4309D04H1/46
CPCD01D5/04D01D5/06D01F6/14D04H1/4309D10B2321/06
Inventor 远藤了庆原哲也佐野友之大森昭夫藤原直树
Owner KURARAY CO LTD
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