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Comb-shaped modified styrene-carboxylic acid copolymer and application thereof

A carboxylic acid copolymer and styrene technology, applied in the field of copolymers, can solve problems such as poor dispersion stability, inability to achieve cathode migration, and large range of charge neutralization

Inactive Publication Date: 2019-08-02
TIANJIN WATONG CHEM PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, these polymers are not suitable for some special construction conditions. For example, in the cathodic electrodeposition coating process, these coating systems are under the action of an electric field. On the positive charge, it shows that the zeta potential is a positive value; although the imide modification described in the patent CN101600740 shows a positive charge type, this polymer has no effect on the dispersion stability of the inorganic pigment kaolin and titanium dioxide in an external electric field. Not good, and maleic anhydride uses alkyl-substituted diamines to partially neutralize the product. Because the molecule contains unreacted carboxyl groups, the system has an isoelectric point problem. When the color paste made of this dispersant and the main resin of the paint When the emulsion is mixed, the charge neutralization range is too large, resulting in delamination of the paint or a negative zeta potential of the paint, which cannot achieve the purpose of migration to the cathode

Method used

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  • Comb-shaped modified styrene-carboxylic acid copolymer and application thereof
  • Comb-shaped modified styrene-carboxylic acid copolymer and application thereof
  • Comb-shaped modified styrene-carboxylic acid copolymer and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 100g of SMA-1000 (Mn=2000) polymer (equivalent to 0.427mol anhydride), put it into a 2000ml glass four-neck flask with stirring and condenser, add A mixture of 440g (0.22mol) of M-2005 amino-terminated polyether and 65.3g (0.64mol) of N,N-dimethylpropylenediamine, then add 5g of solid acid catalyst and deionized water; react at a temperature of 80°C for 4 After hours, the catalyst was filtered off to obtain a pale yellow transparent liquid product. Its comb unit is:

[0036]

[0037] In this example R is H or CH 3 .

Embodiment 2

[0039] Take 100g (0.316mol acid anhydride) of Sma-2000 (Mn=3000) resin, put it into a 1000ml glass four-neck flask with stirring and condenser, add 216g (0.64mol) N,N-diethyl polyether diamine ( Mn=338), then add 4g of solid acid catalyst and deionized water; react at a temperature of 80°C for 4 hours, filter off the catalyst to obtain a light yellow transparent liquid product. Its comb unit is:

[0040]

[0041] In this example R is H or CH 3 .

Embodiment 3

[0043] Take 100g (0.316mol anhydride) of Sma-2000 (Mn=3000) resin, put it into a 1000ml glass four-neck flask with stirring and condenser, add 108g (0.64mol) N, N-ethyl, propylhexamethylenediamine , then add 3g of solid acid catalyst and deionized water; react at a temperature of 80°C for 4 hours, filter off the catalyst to obtain a light yellow transparent liquid product. Its comb unit is:

[0044]

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Abstract

The invention discloses a comb-shaped modified styrene-carboxylic acid copolymer and an application thereof. The comb-shaped modified styrene-carboxylic acid copolymer comprises a styrene unit and a maleic acid graft modification unit, and is prepared from a main-chain polymer SMA (polystyrene maleic anhydride resin) and one or two of N, N-dialkyl polyether amine and N,N-dialkyl substituted diamine through a reaction in water at the temperature of 40-90 DEG C under catalysis of solid acid, or is prepared from the main-chain polymer SMA and one of N, N-dialkyl polyether amine and N,N-dialkyl substituted diamine through a reaction with one of amino alcohol and animo-terminated polyether; the comb-shaped modified styrene-carboxylic acid copolymer as a dispersing agent is used for dispersing color paste of cathode electrophoretic paint, the dispersing agent is mixed with the color paste, and then the mixture is mixed with a main resin emulsion, so that zeta potential of obtained paint is apositive value.

Description

technical field [0001] The invention relates to the technical field of copolymers, in particular to a comb-shaped modified styrene-carboxylic acid copolymer and its application. Background technique [0002] Comb-shaped copolymer refers to a comb-shaped polymer formed by grafting multiple linear branches on a main chain at the same time. It is a special graft polymer. Comb-shaped polymers have good wetting and dispersing effects. In patent CN101600740, comb-shaped copolymers based on optionally substituted styrene / maleic anhydride copolymers are disclosed, which contain various structures and have better wetting and dispersing effects . [0003] However, these polymers are not suitable for some special construction conditions. For example, in the cathodic electrodeposition coating process, these coating systems are under the action of an electric field. On the positive charge, it shows that the zeta potential is a positive value; although the imide modification described i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F8/32C08F212/08C08F222/08C09D17/00
CPCC08F8/32C08G81/025C09D17/005C09D17/008C08F212/08C08F222/08
Inventor 张舜
Owner TIANJIN WATONG CHEM PROD CO LTD
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