Fine-denier or superfine-denier polyvinyl alcohol fiber and preparation method thereof

A technology of polyvinyl alcohol fiber and polyvinyl alcohol, which is applied in the direction of fiber chemical characteristics, wet spinning method, stretch spinning method, etc., which can solve the problems of lower production efficiency, low viscosity of spinning dope, and decreased spinnability of spinning dope, etc. problems, to achieve the effects of high production efficiency, stable and continuous spinning process, and obvious thickening effect

Active Publication Date: 2013-11-13
CHINA PETROCHEMICAL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low concentration of spinning dope can easily lead to low viscosity of spinning dope, resulting in decreased spinnability of spinning dope and lower production efficiency

Method used

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  • Fine-denier or superfine-denier polyvinyl alcohol fiber and preparation method thereof
  • Fine-denier or superfine-denier polyvinyl alcohol fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]Dissolve 10kg of polyvinyl alcohol with a polymerization degree of 2600 and alcoholysis degree ≥ 99% and 90kg of deionized water at a temperature of 98°C for 3 hours to obtain a spinning stock solution, add 0.05kg of boric acid to the stock solution, and adjust the pH of the stock solution with acetic acid is 4.5. The spinning dope is filtered, defoamed, and metered by a metering pump, and then sprayed into the coagulation bath through a spinneret with a specification of 0.04mm. The coagulation bath is a mixed aqueous solution of sodium sulfate and sodium hydroxide with a density of 1.28g / mL, a sodium hydroxide concentration of 32g / L, and a temperature of 44°C. The solidified filaments are neutralized in a mixed aqueous solution of sodium sulfate and sulfuric acid with a density of 1.29g / mL, a sulfuric acid concentration of 12g / L, and a temperature of 44°C. / L, in a mixed aqueous solution of sodium sulfate and sulfuric acid at a temperature of 90°C, carry out wet heat d...

Embodiment 2

[0029] Dissolve 15kg of polyvinyl alcohol with a polymerization degree of 1600 and alcoholysis degree ≥ 99% and 85kg of deionized water at a temperature of 95°C for 2 hours to obtain a spinning stock solution, add 0.015kg of borax to the stock solution, and adjust the pH of the stock solution with acetic acid is 6.5. After the spinning dope is filtered, defoamed and metered by a metering pump, it is sprayed into the coagulation bath through a spinneret with a specification of 0.08mm. The coagulation bath is a mixed aqueous solution of sodium sulfate and sodium hydroxide with a density of 1.31g / mL, a sodium hydroxide concentration of 30g / L, and a temperature of 45°C. The solidified filaments are neutralized in a mixed aqueous solution of sodium sulfate and sulfuric acid with a density of 1.30g / mL, a sulfuric acid concentration of 10g / L, and a temperature of 45°C. / L, in a mixed aqueous solution of sodium sulfate and sulfuric acid at a temperature of 75°C, carry out wet heat dr...

Embodiment 3

[0031] Dissolve 14kg of polyvinyl alcohol with a degree of polymerization of 1700 and a degree of alcoholysis ≥99% and 86kg of deionized water at a temperature of 96°C for 3 hours to obtain a spinning stock solution, add 0.28kg of copper sulfate to the stock solution, and adjust the pH of the stock solution with acetic acid The value is 6. The spinning dope is filtered, defoamed, and metered by a metering pump, and then sprayed into the coagulation bath through a spinneret with a specification of 0.06mm. The coagulation bath is a mixed aqueous solution of sodium sulfate and sodium hydroxide with a density of 1.31 g / mL, a sodium hydroxide concentration of 28 g / L, and a temperature of 45°C. The solidified filaments are neutralized in a mixed aqueous solution of sodium sulfate and sulfuric acid with a density of 1.30g / mL, a sulfuric acid concentration of 11g / L, and a temperature of 45°C. / L, in a mixed aqueous solution of sodium sulfate and sulfuric acid at a temperature of 80°C...

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Abstract

A preparation method of a fine-denier or superfine-denier polyvinyl alcohol fiber comprises the following steps: dissolving 10-15 parts of polyvinyl alcohol in 85-90 parts of deionized water at 95-98DEG C for 2-5h to form a homogeneous solution, adding a thickening agent having a weight being 0.1-2% of the weight of polyvinyl alcohol, adjusting the pH value of the homogeneous solution to 3-6.5 through using acetic acid, and allowing the viscosity of the homogeneous solution to 5000-30000cp in order to prepare a polyvinyl alcohol spinning stock solution, wherein the thickening agent comprises anyone of boric acid, borax, copper sulfate, copper chloride, copper nitrate, sodium chromate, potassium chromate and titanium sulfate; moulding the spinning stock solution to obtain a nascent fiber; and post-processing the nascent fiber to prepare the polyvinyl alcohol fiber. The low-concentration polyvinyl alcohol spinning stock solution has the advantages of good spinnability, good storage stability, stable and continuous spinning process, and relatively few phenomena of broken filaments; and the yield is above 95%. The obtained fiber has a low linear density in a range of 0.16-1.00dtex, a tensile strength of 5-8cN / dtex and an elongation at break of 5-15%, and the Rp value of the obtained formalized fiber is 110-125DEG C.

Description

technical field [0001] The invention relates to a polyvinyl alcohol fiber and a preparation method thereof, in particular to a fine denier or ultrafine denier polyvinyl alcohol fiber and a preparation method thereof. Background technique [0002] With the development of synthetic fibers, people have put forward requirements for comfort, leisure and functionality for daily-use fibers, and at the same time, industrial synthetic fibers also have potential requirements for improvement. In the mid-1980s, Japanese researchers proposed the concept of ultrafine fibers. Microfiber has many unique properties due to its structural characteristics such as low monofilament linear density, small diameter, high orientation and crystallinity, large specific surface area and high flexibility, such as soft hand feeling, delicate and soft luster, good flexibility and good warmth retention. Excellent waterproof and air permeability, excellent filterability, etc. These properties make it widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F1/10D01F11/06D01D5/06D01D5/14D01D10/02
Inventor 徐建军冷平姜猛进李海英叶光斗赵寰何云王建
Owner CHINA PETROCHEMICAL CORP
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