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Modified polyvinyl alcohol

A polyvinyl alcohol, modification technology, applied in the field of polyvinyl alcohol, can solve the problems of poor melt processing performance of modified polyvinyl alcohol, low difference between melting temperature and decomposition temperature, difficult direct melt processing, etc., to achieve melt processing The effect of excellent performance

Pending Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melt processability of the modified polyvinyl alcohol is poor, and the difference between its melting temperature and decomposition temperature is low, so it is difficult to directly melt process

Method used

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  • Modified polyvinyl alcohol
  • Modified polyvinyl alcohol
  • Modified polyvinyl alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] The synthesis of modified PVA is specifically:

[0089] Use a polymerization tank (continuous polymerization device) equipped with a reflux condenser, raw material feeding system, reaction liquid discharging system, thermometer, nitrogen adding system and stirring blade;

[0090] 20% of vinyl acetate (VAC) (630 L / hr), methanol (MeOH) (370 L / hr), and sodium 2-acrylamidotetradecanesulfonate as a modifier were continuously supplied to the polymerization tank using a quantitative pump. Mass % methanol solution (SEMA) (122 L / hr), and 2,2'-azobisisobutyronitrile in 2 mass % methanol solution (AIB) (25 L / hr).

[0091] Then, the polymerization liquid was continuously taken out from the polymerization tank so that the liquid level in the polymerization tank was kept constant. At this time, adjustment was made so that the polymerization rate of vinyl acetate in the polymerization liquid taken out from the polymerization tank became 40%. The residence time in the polymerization ...

Embodiment 2-3 and comparative example 1-4

[0097] Synthesis of PVA

[0098] Except the parameter shown in table 1, other is identical with embodiment 1, carries out the synthesis of modified PVA.

[0099] Table 1 embodiment 2-3 and comparative example 1-4 carry out the parameter of PVA synthesis

[0100]

[0101] Remarks: - indicates that the raw material has not been added.

[0102] Membrane production

[0103] A film was produced in the same manner as in Example 1 except that the modified PVA synthesized in Examples 1-3 and Comparative Examples 1-4 shown in Table 2 was used.

[0104] For the PVA and film obtained above, the PVA melt processability and the mechanical strength (Young's modulus and strength) of the film were measured or evaluated by the above method, and the results are shown in Table 2.

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Abstract

The invention belongs to the technical field of polyvinyl alcohol, and particularly relates to modified polyvinyl alcohol. The modified polyvinyl alcohol comprises a monomer unit represented by formula (I), and in the formula, R1 represents a hydrogen atom or a linear or branched alkyl group having 1-8 carbon atoms; R2 represents a linear or branched dialkane group having 11-18 carbon atoms; x+ is a hydrogen atom, a metal ion or an ammonium group; the content of the monomer units represented by formula (I) is 0.05 mol% to 10 mol% relative to the total monomer units; the viscosity-average polymerization degree of the modified polyvinyl alcohol is 300-3000, and the alcoholysis degree of the modified polyvinyl alcohol is 70mol%-99.5 mol%. The modified polyvinyl alcohol according to the present invention has excellent melt processability.

Description

technical field [0001] The invention belongs to the technical field of polyvinyl alcohol, in particular to a modified polyvinyl alcohol. Background technique [0002] Polyvinyl alcohol has another name called PVA, Poval, etc. It is a high polymer containing -CH2-CH(OH)-group in the main chain of the molecule ("polyvinyl alcohol and its application", Zhang Yi, Journal of Huangshan University, No. 6 in 2004 Volume 3, page 71, left column, paragraph 1, line 1-3, published on June 30, 2004), is one of the few molecules in the world that cannot be directly obtained from its monomer, but from vinyl acetate (PVAC ) The water-soluble polymer that obtains through alkali alcoholysis, its structural formula is as follows. [0003] [0004] Because polyvinyl alcohol contains a large number of hydroxyl groups in its structure, these hydroxyl groups have good hydrophilicity, so that polyvinyl alcohol polymers have good water solubility. Because PVA has excellent properties such as un...

Claims

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Application Information

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IPC IPC(8): C08F8/12C08F218/08C08F220/58C08L29/02C08L3/08C08K3/34C08K5/098C08J5/18
CPCC08F8/12C08J5/18C08J2329/02C08J2403/08C08K3/34C08K5/098
Inventor 吴刚秦庆伟李永江侯双燕范金华
Owner CHINA PETROLEUM & CHEM CORP
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