Method for preparing high-strength high-modulus polyvinyl alcohol fibers

A polyvinyl alcohol fiber, high-strength and high-modulus technology, applied in the chemical characteristics of fibers, complete sets of equipment for the production of rayon, rayon manufacturing, etc., can solve problems such as high equipment requirements, inability to spin, and complex extraction, and achieve fiber strength. and high modulus, easy industrial production, and the effect of increasing the decomposition temperature

Active Publication Date: 2015-02-25
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, copolymerization melt spinning is to modify the chemical structure of polyvinyl alcohol, and the process is complicated; while blending melt spinning has the problem of compatibility between the blend and polyvinyl alcohol; plasticizing melt spinning usually uses small molecules Plasticizer modified polyvinyl alcohol, such as CN1786302A, is melt-spun by adding small molecule nitrogen-containing compounds, hydrophilic polymer auxiliary agents, water and polyvinyl alcohol to form intermolecular hydrogen bonds, but there are many types of small molecule additives , complicated extraction and high cost. For example, CN102776597A, CN102797050A, and CN102776598A use water, amide compounds, polyols, etc. Melt spinning in a twin-screw extruder has high requirements for equipment, and it cannot be spun on conventional melt spinning equipment, which is not universal

Method used

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  • Method for preparing high-strength high-modulus polyvinyl alcohol fibers

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix 100g of tris(hydroxymethyl)aminomethane with 600g of water as a composite modifier, then mix with 30g of magnesium hydroxide and 1000g of polyvinyl alcohol PVA1799 (Note: PVA1799 means that the degree of polymerization of polyvinyl alcohol is 1700, and the degree of alcoholysis is 99%) in a high-speed mixer to obtain modified polyvinyl alcohol, and the modified polyvinyl alcohol is spun on a melt spinning machine to prepare primary fibers. The spinning temperature is 140 ° C and the temperature of the spinneret is 115 ℃, the as-spun fiber was stretched 3 times at 25℃ and then dried in a 100℃ drying oven for 10 minutes, then subjected to 3-stage thermal stretching at 150℃, 175℃, and 200℃ for 3.3 times, and finally heat-set at 210℃ for 1.5 min, that is, high-strength and high-modulus polyvinyl alcohol fibers.

Embodiment 2

[0032] Mix 400g of trimethylolpropane with 700g of water as a composite modifier, and then mix them with 50g of calcium hydroxide and 1000g of polyvinyl alcohol (PVA2499) in a high-speed mixer to obtain modified polyvinyl alcohol. Polyvinyl alcohol is spun on a melt spinning machine to prepare primary fibers. The spinning temperature is 160°C, and the spinneret temperature is 125°C. The primary fibers are stretched twice at 20°C and then dried in a 120°C drying oven for 8 minutes. , and then heat-stretched 7 times in three stages at 150°C, 180°C, and 220°C, and heat-set at 220°C for 0.5 minutes to obtain high-strength and high-modulus polyvinyl alcohol fibers.

Embodiment 3

[0034] Mix 300g of 1,3-dihydroxyacetone with 300g of water as a composite modifier, and then mix them with 5g of calcium hydroxide and 1000g of polyvinyl alcohol (PVA1788) in a high-speed mixer to obtain modified polyvinyl alcohol. Polyvinyl alcohol is spun on a melt spinning machine to prepare as-spun fibers. The spinning temperature is 145°C, and the temperature of the spinneret is 105°C. The as-spun fibers are stretched twice at 25°C and then dried in a 120°C drying oven. 4min, then heat-stretched 10 times in three stages at 150°C, 175°C, and 195°C, and heat-set at 220°C for 3min to obtain high-strength and high-modulus polyvinyl alcohol fibers.

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Abstract

The invention relates to a method for preparing high-strength high-modulus polyvinyl alcohol fibers. The method comprises the following steps of: mixing 10-40 parts by weight of poly-hydroxymethyl compounds with 30-70 parts by weight of water to obtain a mixture serving as a composite modifier; then evenly mixing the composite modifier with 0.01-5 parts by weight of inorganic alkali compounds and 100 parts by weight of polyvinyl alcohol with polymerization degree of 1700-2600 and alcoholysis degree of 88-99% in a high-speed mixer to obtain modified polyvinyl alcohol; then spinning on a melt spinning machine to prepare nascent polyvinyl alcohol fibers; finally implementing cold drawing, drying, multi-stage hot drawing and hot shaping. The method needs neither solvents nor coagulators for wet spinning, thereby being simple in technology and free from pollution; a screw rod with a unique structure is not required; industrial production is easy to realize. The prepared fibers are high in fiber strength and high in modulus and can be used for cement toughening anti-cracking materials, geotextile and tire cords; the prepared fibers also can be used as reinforcing materials for plastics and rubber.

Description

technical field [0001] The invention relates to a method for preparing polyvinyl alcohol fibers, in particular to a method for preparing high-strength and high-modulus polyvinyl alcohol fibers by using general-purpose polyvinyl alcohol. Background technique [0002] High-strength and high-modulus polymer fiber is an important high-performance polymer material with excellent mechanical properties, acid and alkali corrosion resistance, and light weight. It is an important basic material to support the development of high-tech industries. As a kind of high-performance polymer fiber, high-strength and high-modulus polyvinyl alcohol (PVA) fiber has the advantages of high strength, high modulus, good dispersion, acid and alkali resistance, wear resistance, and good affinity with the substrate interface. Widely used as cement toughening anti-cracking materials, geotextiles, tire cords, and as reinforcing materials for plastics and rubbers. Therefore, the development of high-streng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/50D01F1/10D01D13/00
Inventor 刘加平徐德根刘建忠阳知乾吕进周华新崔巩李长风
Owner JIANGSU SOBUTE NEW MATERIALS
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