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Vinyl alcohol series polymer

A vinyl alcohol-based polymer technology, applied in the direction of unsaturated alcohol copolymer adhesives, adhesive types, water repellent addition, etc., can solve problems such as difficult active polymerization

Inactive Publication Date: 2011-01-26
李汝基
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since vinyl ester monomers are difficult to achieve active polymerization, there are no examples of vinyl alcohol polymers with star-shaped molecular structures.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] This example is for the preparation of vinyl alcohol polymers by traditional free radical polymerization

[0098] A. Polymerization

[0099] In a 250ml four-neck flask equipped with a stirrer, constant pressure dropping funnel, nitrogen gas and reflux condensing device, add 1.8mmol of divinylbenzene, 300mmol of vinyl acetate, and 0.45mmol of azobisisobutyronitrile (AIBN) , Methanol 100ml. Place the four-necked bottle in a temperature-controlled water bath, blow nitrogen and oxygen for 30 minutes, raise the temperature to 60°C while stirring, and stir and react at 60°C for 60 minutes, then slowly add dodecyl mercaptan (DDT) to the system dropwise 0.135mmol, dropped within 30min, and ended after a total of 1.5h of reaction.

[0100] B. Saponification

[0101] After 1.5 h of reaction time, the above reaction solution was cooled to 40° C., then 3 g of 8% NaOH in methanol was added, and the saponification reaction was continued to stir at 40° C. for 2 h.

[0102] C. refi...

Embodiment 2

[0106] In this example, a traditional free radical polymerization method is used to prepare vinyl alcohol polymers modified with silane groups.

[0107] Except that in the polymerization step A, when slowly adding 0.135mmol of dodecyl mercaptan (DDT) to the system, and adding 1.5mmol of vinyltrimethoxysilane, the rest are carried out in the same way as in Example 1. Carry out polymerization, saponification and refining to obtain a core and arm star composed of divinylbenzene cross-linked product as the gel core and vinyl alcohol polymer arms modified by silane groups connected to the core. A vinyl alcohol-based polymer with a molecular structure.

Embodiment 3

[0109] This example uses atom transfer radical polymerization (ATRP) to synthesize the core of the gel core, and then uses the traditional free radical polymerization method to prepare vinyl alcohol polymers

[0110] A. The core of the synthetic gel core

[0111] a. Calibrate the standard time of the synthesis reaction: In a 25ml polymerization tube equipped with magnetic stirring, vacuuming and argon gas device, add 0.0625mmol of 2-bromo(2-methyl)propionate methyl ester, divinyl Benzene 6.25mmol, cuprous chloride 0.0625mmol, 2,2′-bipyridine 0.125mmol, xylene 10ml, after sealing, stir evenly at 0°C, and the reaction solution was frozen-vacuum-thawed-argon gas for 5 times After deoxygenation, close the reactor under the protection of nitrogen, put it into a water bath temperature control device, raise the temperature while stirring, and stir the reaction at 50 ° C. After the reaction time of 3 minutes, the system is cooled down, and the catalyst is deactivated by passing oxygen...

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Abstract

The invention discloses vinyl alcohol series polymer. The vinyl alcohol series polymer consists of a core and vinyl alcohol series polymer arms which are connected to the core and has a core-arm star-shaped molecular structure, wherein the core comprises a polymeric polyfunctional crosslinking agent monomer or polyfunctional chain transfer agent; and the polyfunctional crosslinking agent monomer is a polymerizable monomer with two or more vinyl groups, and the polyfunctional chain transfer agent is a polythiol compound with three or more mercapto groups. The aqueous solution of the polymer has low viscosity characteristic, and the polymer has water resistance and has high cohesiveness to inorganic substances. The invention also provides a preparation method of the vinyl alcohol series polymer at the same time. The polymer of the invention can be applied to a coating for coating paper, and can be used as a sizing agent in the paper or on the surface of the paper, interior and exterior wall coatings for buildings or an adhesive in packaging or textile industries.

Description

technical field [0001] The present invention relates to vinyl alcohol-based polymers, and particularly relates to a vinyl alcohol-based polymer having low viscosity and high water resistance and a composition of a coating liquid containing the polymer. Background technique [0002] Polyvinyl alcohol (hereinafter referred to as PVA), a representative of vinyl alcohol polymers, is a hydrophilic water-soluble synthetic polymer widely used in paper processing, building materials, coatings, etc., as a binder for organic and inorganic substances , Compared with other synthetic polymer binders, it has the advantages of high bonding strength and excellent film-forming properties. [0003] Due to its poor water resistance and high viscosity, traditional PVA has encountered certain obstacles in actual use. As a solution to this problem, there is a cross-linking method using a cross-linking agent. For example: cross-linking with formaldehyde to improve its water resistance, but there...

Claims

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Application Information

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IPC IPC(8): C08F218/04C08F218/08C08F8/12C08F230/08C08F293/00C08F118/04C08F118/08C08F2/38C09D129/04C09D153/00D21H19/00D21H17/36D21H21/16C09J129/04C09J153/00
Inventor 李汝基
Owner 李汝基
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