Alkali-proof and temperature-resistant PVA (Polyvinyl Alcohol) fiber and purpose thereof

A fiber and alkali-resistant technology, applied in the field of alkali-resistant PVA fiber and high temperature resistance, can solve the problems of not satisfying both high temperature resistance and alkali resistance, PVA fiber shrinkage or even decomposition, and mechanical properties cannot be guaranteed, and achieve high temperature resistance, Good dispersibility and excellent alkali resistance

Inactive Publication Date: 2017-10-24
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In practical application, we found that there is a need for a PVA fiber that can withstand both high temperature and alkali. However, the conventional PVA fiber will shrink or even decompose severely under high temperature environment, and the mechanical properties cannot be guaranteed, so there is a defect that it is not resistant to high temperature.
In the existing disclosed technology, there is no technical solution that can solve the high temperature resistance of PVA fiber, and there is no technical solution that can meet both high temperature resistance and alkali resistance.

Method used

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  • Alkali-proof and temperature-resistant PVA (Polyvinyl Alcohol) fiber and purpose thereof
  • Alkali-proof and temperature-resistant PVA (Polyvinyl Alcohol) fiber and purpose thereof
  • Alkali-proof and temperature-resistant PVA (Polyvinyl Alcohol) fiber and purpose thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: PVA with a degree of polymerization of 1500 and a degree of alcoholysis of 95% (mol) is dissolved successively, spinned, coagulated in a coagulation bath, wet-heat stretched, heat-set, and then the fiber is subjected to secondary hydroformylation at normal temperature. For the first time, glutaraldehyde was used for hydroformylation, and the hydroformylation solution was composed of glutaraldehyde, concentrated sulfuric acid, zinc chloride and water, wherein the concentration of glutaraldehyde was 80g / L, the concentration of concentrated sulfuric acid was 220g / L, and the concentration of zinc chloride The concentration is 30g / L, the temperature of the formaldehyde solution is 75°C, the time of formaldehyde is 45 minutes, and formaldehyde is used for the second time. The formaldehyde solution is composed of formaldehyde, concentrated sulfuric acid, sodium sulfate and water, and the concentration of formaldehyde is 40g / L , the concentration of concentrated sulfu...

Embodiment 2

[0047] Example 2: PVA with a degree of polymerization of 2000 and a degree of alcoholysis of 90% (mol) is dissolved successively, spinned, coagulated in a coagulation bath, wet-heat stretched, heat-set, and then the fibers are subjected to secondary hydroformylation. The binary aldehyde used in the first hydroformylation is a combination of glutaraldehyde and glyoxal, and the hydroformylation solution is composed of glutaraldehyde, glyoxal, concentrated sulfuric acid, zinc chloride and water, wherein glutaraldehyde and The total concentration of dialdehyde in the hydroformylation solution is 90g / L, the concentration of concentrated sulfuric acid is 180g / L, the concentration of zinc chloride is 60g / L, the temperature of the hydroformylation solution is 65°C, and the hydroformylation time is 25 minutes. Glutaraldehyde and The molar ratio of glyoxal is 7:3, the aldehyde used for the second time is a composition of formaldehyde and acetaldehyde, and the formaldehyde solution is com...

Embodiment 3

[0049] Example 3: PVA with a degree of polymerization of 2400 and a degree of alcoholysis of 99.5% (mol) was dissolved successively, spinned, coagulated in a coagulation bath, wet-heat stretched, heat-set, and then the fiber was subjected to secondary hydroformylation at normal temperature. The aldehyde used for the first hydroformylation is a combination of glutaraldehyde and adipaldehyde, and the hydroformylation solution is composed of glutaraldehyde, adipaldehyde, concentrated sulfuric acid, zinc chloride and water, wherein glutaraldehyde and adipaldehyde are in the aldehyde The total concentration in the hydroformylation solution is 50g / L, the concentration of concentrated sulfuric acid is 170g / L, the concentration of zinc chloride is 80g / L, the temperature of the hydroformylation solution is 80°C, the hydroformylation time is 35 minutes, the moles of glutaraldehyde and adipaldehyde The ratio is 7:3, the aldehyde used for the second time is a composition of formaldehyde an...

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Abstract

The invention discloses an alkali-proof and temperature-resistant PVA (Polyvinyl Alcohol) fiber. The hydroformylation degree eta of the PVA fiber is 25 percent to 35 percent; the shrinkage rate S% and the water temperature T of the fiber of the PVA fiber in water at 120 DEG C to 180 DEG C meet the following formula (I): S is less than 0.16T-18.8 (I), wherein T is more than 120 DEG C but less than 180 DEG C. The PVA fiber provided by the invention has relatively high temperature resistance, keeps stiff and smooth and cannot be decomposed in the water at 120 DEG C to 180 DEG C; the fiber is guaranteed to have enough mechanical performance at high temperature; the tensile strength is 6cN / dtex to 13cN / detx; the shrinkage rate S of the fiber at 120 DEG C only reaches 0.1 percent; the shrinkage rate S of the fiber at 180 DEG C only reaches 9.0 percent; the alkali-proofing performance is excellent; when being kept in alkali liquor in which pH (potential of Hydrogen) is equal to 10 for 12 hours, the fiber has the mass loss rate which is less than 0.5 percent; meanwhile, the alkali-proof and temperature-resistant PVA fiber is good in dispersity and high in mechanical strength; the PVA fiber provided by the invention has the fiber density of 1.0dtex to 1.8dtex and the break elongation of 10 percent to 20 percent at normal temperature.

Description

technical field [0001] The invention relates to a PVA fiber, in particular to a high temperature-resistant and alkali-resistant PVA fiber and its application. Background technique [0002] PVA (polyvinyl alcohol) fiber is a kind of fiber with excellent performance, which has the characteristics of high strength, high modulus, low elongation, etc., as well as excellent wear resistance, impact resistance, seawater corrosion resistance, weather resistance, dispersion It is widely used as nets for shallow sea laver cultivation, high-performance ropes, tire cords, industrial fabrics, cement reinforcement materials, and plastic and rubber reinforcement materials, etc., with broad market potential . [0003] In recent years, researchers at home and abroad have continued to carry out a lot of research on PVA fibers. CN200510057435, a method for preparing high-performance polyvinyl alcohol fibers, using a compound modifier composed of nitrogen-containing compounds, hydrophilic auxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/14D01F11/06C09K8/467C09K8/508C09K8/68C04B16/06
CPCC04B16/0641C09K8/467C09K8/5086C09K8/68C09K8/885C09K2208/10D01F6/14D01F11/06
Inventor 周霖王华全冷平黎莉徐小松
Owner CHINA PETROCHEMICAL CORP
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