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Modification method of polyvinyl alcohol capable of being subjected to thermoplastic processing

A polyvinyl alcohol and modification technology, applied in the field of thermoplastic processable polyvinyl alcohol modification, can solve the problems of small molecule overflow, excessive microporous structure, affecting profiles, etc., and achieves reduced dosage, simple process, and easy operation. handy effect

Pending Publication Date: 2020-05-08
KANGTAI PLASTIC SCI & TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process simply relies on destroying the intermolecular force and inhibiting the orderly exclusion of the PVA molecular chain, thereby inhibiting its crystallinity to achieve thermoplastic processing. In order to achieve thermoplastic processing of polyvinyl alcohol, it is often necessary to add high The high content of small molecules of polyhydroxyl, and the addition of high content of small molecules will cause overflow of small molecules during melt processing, especially in high-temperature processing. The overflow of small polyhydroxyl molecules will lead to melt processing Excessive microporous structure affects the mechanical properties of profiles. In order to improve the mechanical properties of polyvinyl alcohol profiles, it is necessary to reduce the overflow of polyhydric small molecule alcohols in polyvinyl alcohol during processing. Therefore, it is urgent to develop new polyvinyl alcohols. New technology for thermoplastic modification of vinyl alcohol to realize the major demand of polyvinyl alcohol in the industrial field, thus leading the rapid development of non-petroleum-based polymer materials

Method used

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  • Modification method of polyvinyl alcohol capable of being subjected to thermoplastic processing
  • Modification method of polyvinyl alcohol capable of being subjected to thermoplastic processing
  • Modification method of polyvinyl alcohol capable of being subjected to thermoplastic processing

Examples

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Embodiment 1

[0025] The grade of polyvinyl alcohol used in this embodiment is PVA1798, its degree of alcoholysis is 98%, and polyhydroxy small molecule D-sorbitol.

[0026] (1) Mix D-sorbitol, polyvinyl alcohol and water at a mass ratio of 5:40:100, and dissolve at 60°C until the polyvinyl alcohol is completely dissolved in the aqueous solution to obtain a homogeneous solution.

[0027] (2) Add the homogeneous solution prepared in step (1) into liquid nitrogen, and rapidly cool at a cooling rate of 80° C. / min to obtain a frozen mixture of polyvinyl alcohol ice crystals, and then quickly transfer the mixture to a freeze dryer, The modified polyvinyl alcohol was obtained by cooling and drying at -50°C. The melting temperature of the modified polyvinyl alcohol was 135°C.

Embodiment 2

[0029] The grade of polyvinyl alcohol used in this embodiment is PVA1788, its degree of alcoholysis is 88%, polyhydroxy small molecule glycerin.

[0030] (1) Mix glycerin, polyvinyl alcohol and water at a mass ratio of 2:40:100 and dissolve at 80°C until the polyvinyl alcohol is completely dissolved in the aqueous solution to obtain a homogeneous solution.

[0031] (2) Add the homogeneous solution prepared in step (1) into liquid nitrogen, and rapidly cool at a cooling rate of 100° C. / min to obtain a frozen mixture of polyvinyl alcohol ice crystals, and then quickly transfer the mixture to a freeze dryer, The modified polyvinyl alcohol was obtained by cooling and drying at -50°C. The melting temperature of the modified polyvinyl alcohol was 138°C.

Embodiment 3

[0033] The grade of polyvinyl alcohol used in this embodiment is PVA1797, its degree of alcoholysis is 97%, polyhydroxy small molecule glucose.

[0034] (1) Mix glucose, polyvinyl alcohol and water at a mass ratio of 1:10:100 and dissolve at 30°C until the polyvinyl alcohol is completely dissolved in the aqueous solution to obtain a homogeneous solution.

[0035](2) Add the homogeneous solution prepared in step (1) into liquid nitrogen, and rapidly cool at a cooling rate of 80° C. / min to obtain a frozen mixture of polyvinyl alcohol ice crystals, and then quickly transfer the mixture to a freeze dryer, The modified polyvinyl alcohol was obtained by cold dynamic drying at -80°C. The melting temperature of the modified polyvinyl alcohol was 132°C.

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Abstract

The invention relates to the technical field of thermoplastic processing of polyvinyl alcohol, and concretely relates to a modification method of polyvinyl alcohol capable of being subjected to thermoplastic processing. The method comprises the following steps: (a) performing molecular modification: mixing a polyhydroxy small molecular compound with an aqueous polyvinyl alcohol solution to form ahomogeneous solution; and (b) performing physical modification: cooling the homogeneous solution in step (a) to form an ice crystal mixture, and freeze-drying the ice crystal mixture. The polyvinyl alcohol is firstly subjected to molecular modification, and then is subjected to physical modification, and molecular modification and physical modification are combined to achieve synergistic effects,so the melting temperature of the polyvinyl alcohol is reduced greatly, and meanwhile, the temperature interval of melting processing is increased, thereby the polyvinyl alcohol is conveniently subjected to melting processing to prepare various profiles, such as pipes.

Description

technical field [0001] The present application relates to the technical field of polyvinyl alcohol thermoplastic processing, in particular, to a thermoplastic processable polyvinyl alcohol modification method. Background technique [0002] Polyvinyl alcohol (PVA) is a polymer material prepared from non-petroleum-based raw materials such as coal and natural gas, and can be industrially produced on a large scale. To a certain extent, it reduces the dependence of my country's polymer materials on petroleum, which has long-term strategic significance. At the same time, polyvinyl alcohol has excellent comprehensive properties, such as excellent barrier properties, chemical corrosion resistance, oil resistance, solvent resistance, and excellent mechanical properties and heat resistance, far superior to general polyolefin materials, and engineering plastics ( Polyamide, polycarbonate, etc.) performance is comparable, but its price is much lower than engineering plastics. At the s...

Claims

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Application Information

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IPC IPC(8): C08J3/00C08L29/04C08K5/053C08K5/1545
CPCC08J3/00C08J2329/04C08K5/053C08K5/1545
Inventor 王琪聂敏李莉张双全郝洪波
Owner KANGTAI PLASTIC SCI & TECH GRP
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