LaCl3 cross-linked high-strength high-modulus polyvinyl alcohol fiber and preparation method thereof

A polyvinyl alcohol fiber, high-strength and high-modulus technology, applied in the directions of fiber chemical characteristics, spinning solution preparation, wet spinning, etc., to achieve the effects of increased stretching ratio, active chemical properties, and improved breaking strength and elastic modulus

Active Publication Date: 2020-12-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can produce PVA fibers with higher breaking strength and elastic modulus, the theoretical breaking strength and elastic

Method used

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  • LaCl3 cross-linked high-strength high-modulus polyvinyl alcohol fiber and preparation method thereof
  • LaCl3 cross-linked high-strength high-modulus polyvinyl alcohol fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A LaCI 3 The preparation method of the high-strength high-modulus polyvinyl alcohol fiber of crosslinking, its step is as follows:

[0037] (1) Dissolve polyvinyl alcohol with a degree of alcoholysis of 98% and a degree of polymerization of 1700 in DMSO, and add LaCl 3 , until the polyvinyl alcohol is completely dissolved to obtain the spinning solution; in the spinning solution, the mass fraction of polyvinyl alcohol is 13.2wt%, LaCl 3 The mass fraction of is 0.50wt%;

[0038] (2) The spinning solution is degassed for 3 hours at a temperature of 78°C;

[0039] (3) The spinning liquid is subjected to wet spinning; wherein, the wet spinning process is as follows: the extrusion rate of the spinneret hole is 4.0ml / min, the spinning temperature is 88°C, and the diameter of the spinneret hole is 0.31mm;

[0040] (4) The as-spun fiber obtained by spinning passes through the first-stage coagulation bath (solidification time is 1.8min) with ethanol as the solvent at a temper...

Embodiment 2

[0050] a LaCl 3 The preparation method of the high-strength high-modulus polyvinyl alcohol fiber of crosslinking, its step is as follows:

[0051] (1) Dissolve polyvinyl alcohol with a degree of alcoholysis of 99% and a degree of polymerization of 1900 in DMSO, and add LaCl 3 , to obtain the spinning solution after polyvinyl alcohol is completely dissolved; in the spinning solution, the mass fraction of polyvinyl alcohol is 13.8wt%, LaCl 3 The mass fraction of is 0.56wt%;

[0052] (2) The spinning solution is degassed for 2.9 hours at a temperature of 80°C;

[0053] (3) The spinning liquid is subjected to wet spinning; wherein, the wet spinning process is: the extrusion rate of the spinneret hole is 3.9ml / min, the spinning temperature is 85°C, and the diameter of the spinneret hole is 0.30mm;

[0054] (4) The as-spun fiber obtained by spinning passes through the first-stage coagulation bath with methanol as the solvent at a temperature of -10°C (the curing time is 1.9min), ...

Embodiment 3

[0057] a LaCl 3 The preparation method of the high-strength high-modulus polyvinyl alcohol fiber of crosslinking, its step is as follows:

[0058] (1) Dissolve polyvinyl alcohol with a degree of alcoholysis of 99% and a degree of polymerization of 2600 in DMSO, and add LaCl 3 , until the polyvinyl alcohol is completely dissolved to obtain the spinning solution; in the spinning solution, the mass fraction of polyvinyl alcohol is 14wt%, LaCl 3 The mass fraction of is 0.72wt%;

[0059] (2) Degassing treatment of the spinning solution for 3.0 hours at a temperature of 79°C;

[0060] (3) The spinning liquid is subjected to wet spinning; wherein, the wet spinning process is: the extrusion rate of the spinneret hole is 3.8ml / min, the spinning temperature is 90°C, and the diameter of the spinneret hole is 0.32mm;

[0061] (4) The as-spun fiber obtained by spinning passes through the first-stage coagulation bath (curing time: 1.8 min) with ethanol as the solvent at a temperature of -1...

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Abstract

The invention relates to a LaCl3 cross-linked high-strength high-modulus polyvinyl alcohol fiber and a preparation method thereof. The preparation method comprises the steps that polyvinyl alcohol with the polymerization degree of 1700-2600 is dissolved in DMSO, LaCl3 is added till polyvinyl alcohol is completely dissolved, a spinning solution is obtained, wet spinning is carried out to obtain nascent fibers, the nascent fibers is subjected to first-stage coagulating bath, first-time stretching, second-stage coagulating bath, second-time stretching and third-stage coagulating bath treatment insequence, and then subjected to first-time hot stretching, extraction and second-time hot stretching to obtain the high-strength and high-modulus polyvinyl alcohol fibers, wherein the temperature ofthe first-stage coagulating bath is 11 DEG C below zero-9 DEG C below zero, the temperature of the second-stage coagulating bath is 1 DEG C below zero-1 DEG C, the temperature of the third-stage coagulating bath is 9-10 DEG C, and the breaking strength of the prepared fiber is 13.6-16.3 cN/dtex, the fineness of the prepared fiber is 6.2-8.3 dtex, the elastic modulus of the prepared fiber is 325-347 cN/dtex, and the melting point of the prepared fiber is 246-253 DEG C.

Description

technical field [0001] The technical field of polyvinyl alcohol (PVA) fiber that the present invention belongs to relates to a kind of LaCl 3 Cross-linked high-strength and high-modulus polyvinyl alcohol fiber and its preparation method. Background technique [0002] Concrete has the advantages of high strength, high rigidity, good durability, strong plasticity, and good environmental tolerance, so it is widely used in infrastructure construction such as bridges, tunnels, houses, dams, roads, railways, and military facilities. But at the same time, there are also defects such as low tensile strength, high brittleness, poor toughness, small ultimate tensile strain, poor impact resistance and wear resistance, and cracks of varying degrees due to plastic shrinkage and external forces during service. After people's continuous research, it is found that fiber reinforced concrete is one of the most effective methods recognized in the field of geotechnical construction to improve ...

Claims

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Application Information

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IPC IPC(8): D01F6/50D01F1/10D01D1/02D01D5/06D01D5/16
CPCD01F6/50D01F1/10D01D1/02D01D5/06D01D5/16
Inventor 邹黎明王华君李文刚吴迪王艳丽王超孙晨凯许永静
Owner DONGHUA UNIV
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