Water-soluble low-crosslinking polymaleic anhydride-diisobutylene copolymer salt dispersant and preparation method thereof

A technology of polymaleic anhydride and diisobutylene, which is applied in the direction of coating, etc., can solve the problems of impurity problems that cannot be solved, the cost of copolymers increases, and it is difficult to remove them completely, so as to achieve good application prospects, improve production efficiency, and increase heat resistance temperature Effect

Inactive Publication Date: 2015-12-09
宜兴市湖景化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Document [Chinese patent, CN102532382A] and document [U.S.Patent2,725,367] added the third component in the system that maleic anhydride and diisobutylene come to copolymerize, and the former introduces acrylic acid, and the latter introduces divinylbenzene, when using The performance has been improved, but the organic solvent is still removed by vacuum distillation, and the impurity problem still cannot be solved
[0005] In summary, the maleic anhydride-diisobutylene copolymer salt process prepared by the existing method separates polymerization and saponification, which is relatively complicated, and the organic solvent is removed by distillation, which consumes energy and is difficult to remove completely, resulting in the copolymer The increase in cost, and the obtained copolymer salt is a water-soluble linear polymer with a low glass transition temperature, which also limits its application at higher temperatures (greater than 120°C) such as solution-polymerized styrene-butadiene rubber

Method used

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  • Water-soluble low-crosslinking polymaleic anhydride-diisobutylene copolymer salt dispersant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Synthesis of copolymer: 33.6g of diisobutylene, 29.4g of maleic anhydride, 1.52g of N-methylolacrylamide, 32g of solvent benzene and 0.15g of BPO were added to the product equipped with a thermometer, electric stirrer and condenser. Three-necked flask. Nitrogen gas was introduced for 2 minutes from a port where the thermometer was inserted as a protective gas. Heat with a water bath to control the polymerization temperature at 80°C, and polymerize for 8 hours. After the polymerization is completed, 0.09 g of ethylenediamine is added to the system for cross-linking reaction.

[0026] (2) Saponification of copolymer: Add 24 g of sodium hydroxide and 70 g of deionized water into the polymerization system. Airtightly stir and heat for 1.5 hours in a water bath at a constant temperature of 95°C.

[0027] (3) Separation of the copolymer: After the resulting mixed system is finally allowed to stand for 2.5 hours, the lower layer solution is obtained through oil-water separat...

Embodiment 2

[0029] (1) Synthesis of copolymer: 33.6g of diisobutylene, 29.4g of maleic anhydride, 5.3g of pentaerythritol triacrylate, 30g of solvent ethyl acetate and 0.2g of BPO were added to a thermometer, electric stirrer and condenser. Three-necked flask. Nitrogen gas was introduced for 2 minutes from a port where the thermometer was inserted as a protective gas. Heat with a water bath to control the polymerization temperature at 90°C, and polymerize for 4 hours. After the polymerization is completed, 0.09g methylamine and 0.18g diethylamine are added to the system for crosslinking reaction.

[0030] (2) Saponification of copolymer: Add 75g of concentrated ammonia water (mass concentration 28%) into the polymerization system. Airtightly stir and heat in a water bath at a constant temperature of 95°C for 1 hour.

[0031] (3) Separation of the copolymer: After the resulting mixed system is finally allowed to stand for 2 hours, the lower layer solution is obtained through oil-water separa...

Embodiment 3

[0033] (1) Synthesis of copolymer: 33.6g diisobutylene, 29.4g maleic anhydride, 2.7g glycidyl methacrylate, 18g benzene and 18g xylene mixed solvent, 0.18g hydrogen peroxide are added to the mixture Thermometer, electric stirrer and condenser in a three-necked flask. Nitrogen gas was introduced for 2 minutes from a port where the thermometer was inserted as a protective gas. Heat with a water bath to control the polymerization temperature at 80°C, and polymerize for 6 hours. After the polymerization is completed, 0.08 g of ethylamine and 0.08 g of triethylamine are added to the system for cross-linking reaction.

[0034] (2) Saponification of copolymer: Add 24 g of sodium hydroxide and 65 g of deionized water into the polymerization system. Airtightly stir and heat in a water bath at a constant temperature of 99°C for 1 hour.

[0035] (3) Separation of the copolymer: After the resulting mixed system is finally allowed to stand for 2 hours, the lower layer solution is obtained th...

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Abstract

The invention discloses a technological method for preparing water-soluble low-crosslinking polymaleic anhydride-diisobutylene copolymer salt dispersant. According to the dispersant, a third monomer is added as a cross-linking agent for achieving light crosslinking of a system in the polymerization process, and the usability of the polymerization system is upgraded. The technology that saponification is conducted immediately after the polymerization, organic solvent is removed through the oil-water separation and membrane separation technologies, the defects that in a traditional technology, namely polymerization, distillation and saponification, energy is consumed and the efficiency is low are avoided, the preparation process is simplified, and the preparation efficiency is remarkably improved. The dispersant obtained through the method has the advantages that the water solubility and light crosslinking characteristic are achieved simultaneously, and the crosslinking degree reaches 16.8%-22.7%; the operating temperature is raised, and the glass-transition temperature of polymer reaches 78.5 DEG C-82.5 DEG C; the dispersion force of the system is 95-130 mg/MnO<2> per 100 ml of sample solutions, wherein the concentration of the sample solutions is 0.025%. Therefore, the water-soluble low-crosslinking polymaleic anhydride-diisobutylene copolymer salt dispersant has a good application prospect in such fields as solution polymerized styrene-butadiene rubber, coating dispersion technology and leather tanning agent dispersion technology.

Description

Technical field [0001] The present invention relates to a water-soluble low-crosslinked polycarboxylic acid copolymer salt dispersant and a preparation method thereof. The dispersant is mainly used in the technical field of solution-polymerized styrene butadiene rubber dispersion, and can also be used in the fields of coating dispersion, leather tanning agent dispersion, etc. . Background technique [0002] Dispersant (Dispersant) is a surfactant with two opposite properties, lipophilicity and hydrophilicity in the molecule. It can uniformly disperse the solid particles of inorganic and organic pigments that are difficult to dissolve in liquids, and at the same time can prevent the sedimentation and agglomeration of the solid particles to form a stable suspension. Traditional dispersants have a certain dispersing effect on solid particles in the dispersion medium, but because their adsorption on the surface of the particles is not strong, they are easy to desorb from the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/14C08F222/06C08F220/58C08F222/20C08F220/32C08F220/28C08F8/12C08F6/12C08J3/24C08L9/06C08L23/20C09D7/12
Inventor 王志鑫王慧雅杭祖圣怀旭
Owner 宜兴市湖景化工有限公司
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