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Method for preparing isocyanate cross-linking agent prepolymer

A technology of isocyanate and cross-linking agent, which is applied in the field of preparation of cross-linking agent for cathodic electrophoretic coatings, can solve the problems of poor corrosion resistance, poor abrasion resistance, weak adhesion, etc. Effect

Active Publication Date: 2013-02-13
ANHUI LINGYANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional electrophoretic coatings have defects such as poor wear resistance, weak adhesion, and poor corrosion resistance. We can introduce isocyanate crosslinking agent prepolymers into other resins, directly as film-forming materials, and can be cross-linked; or as Cross-linking curing agent or other additives for film-forming resins to improve the hardness, gloss, abrasion resistance, solvent resistance, corrosion resistance, adhesion and other properties of electrophoretic coatings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] (1) LY-1 production method

[0018] Add 131 parts of IPDI into the reaction kettle equipped with a stirrer, reflux condenser and thermometer, add 73 parts of methyl ethyl ketone oxime into the dropping tank, start stirring and raise the temperature at 45°C, start adding methyl ethyl ketone oxime dropwise, the dropping time is 200min, When dropping, the temperature is controlled at 50°C, and the dropping temperature should be strictly controlled, and avoid overheating. After the dropwise addition, keep stirring for 30 minutes. After confirming that the temperature does not increase, then raise the temperature to 70°C, and keep warm at 70±2°C for 120 minutes. , after the detection index meets the technical requirements, cool down to 40°C for standby;

[0019] (2) LY-2 production method

[0020] Add 26 parts of TDI into the reaction kettle equipped with a stirrer, reflux condenser and thermometer, and add 21 parts of imidazole in the dropping tank. Start stirring and rai...

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PUM

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Abstract

The invention discloses a method for preparing an isocyanate cross-linking agent prepolymer and belongs to the technical field of preparation methods for cross-linking agents for cathode electrophoretic coatings. The isocyanate cross-linking agent prepolymer can stably coexist with multiple kinds of waterborne resin for a long time at normal temperature; during treatment, an isocyanate group released by the curing agent reacts with groups such as a hydroxyl group, a carboxyl group and an amino group on molecular chains of the waterborne resin to form a cross-linking structure, and the performance of the waterborne resin can be remarkably improved, so that the comprehensive performance of an electrophoretic coating is improved; and the isocyanate cross-linking agent prepolymer can be taken as a cross-linking agent for electrophoretic coatings, and can remarkably improve the properties of paint films of the coatings such as water resistance, chemical resistance, wear resistance, adhesion and mechanical properties through curing crosslinking.

Description

technical field [0001] The invention relates to a preparation method of an isocyanate crosslinking agent prepolymer, and belongs to the technical field of preparation methods of a crosslinking agent for cathodic electrophoretic coatings. Background technique [0002] Electrophoretic coatings have been widely favored by people for a long time because of their unique advantages such as water-based, less pollution, convenient coating and high corrosion resistance of the coating film. Applications. However, traditional electrophoretic coatings have defects such as poor wear resistance, weak adhesion, and poor corrosion resistance. We can introduce isocyanate crosslinking agent prepolymers into other resins, directly as film-forming materials, and can be cross-linked; or as Cross-linking curing agent or other additives for film-forming resins to improve the hardness, gloss, abrasion resistance, solvent resistance, corrosion resistance, adhesion and other properties of electropho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/48C08G18/58C09D5/44C09D163/00C09D7/12
Inventor 刘玉陈小琴林秀龙
Owner ANHUI LINGYANG NEW MATERIAL CO LTD
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