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Preparation method of silica modified epoxy resin curing agent and varnish

An epoxy resin curing and epoxy resin technology, which is used in the field of SiO2 modified epoxy resin curing agent and varnish preparation, can solve the problems of difficult control of reaction speed, large curing shrinkage stress, and epoxy coating limitation, and achieves excellent high Gloss properties, reduced cure shrinkage stress, excellent tensile properties and effects of high gloss properties

Inactive Publication Date: 2012-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aliphatic amine curing agent used directly has the following defects: ① poor compatibility with epoxy resin, resulting in a decline in various properties of the coating film; ② in low-level aliphatic amine molecules, due to more active hydrogen, The curing reaction with epoxy resin is very fast, and it reacts violently at room temperature, and the reaction speed is not easy to control; ③The curing shrinkage stress is large, making the coating easy to crack and brittle; the above defects are more serious in hot and humid climate conditions
This makes epoxy coatings subject to certain restrictions in practical applications

Method used

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  • Preparation method of silica modified epoxy resin curing agent and varnish
  • Preparation method of silica modified epoxy resin curing agent and varnish
  • Preparation method of silica modified epoxy resin curing agent and varnish

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Modification and preparation of epoxy curing agent

[0025] 1) Add 0.2 parts of nano-SiO to 15 parts of end-capped compound glycidyl tert-carbonate (E10-P) while stirring 2 Powder, and ultrasonic 30min;

[0026] 2) Add 10 parts of diethylenetriamine into the reaction kettle, and when the preset temperature reaches 65°C, slowly add 15 parts of end-capping compound glycidyl tertiary carbonate (E10-P) while stirring;

[0027] 3) After the dropwise addition is completed, the temperature is raised in stages, the temperature rise rate is 5°C / h, and the time for the temperature rise and capping reaction is 2h;

[0028] 4) Under uniform mechanical stirring, gradually add 3 parts of epoxy resin dissolved in an organic solvent for chain extension reaction, react for 2 hours after adding, and cool to obtain a terminal-modified curing agent.

[0029] (2) Preparation of epoxy varnish

[0030] 1) Mix 2 parts of organic solvent with 10 parts of epoxy resin, add 0.4 parts of eth...

Embodiment 2

[0035] (1) Modification and preparation of epoxy curing agent

[0036] 1) Add 0.4 parts of nano-SiO to 15 parts of end-capped compound glycidyl tert-carbonate (E10-P) while stirring 2 Powder, and ultrasonic 30min;

[0037] 2) Add 10 parts of diethylenetriamine into the reaction kettle, and when the preset temperature reaches 65°C, slowly add 15 parts of end-capping compound glycidyl tertiary carbonate (E10-P) while stirring;

[0038] 3) After the dropwise addition is completed, the temperature is raised in stages, the temperature rise rate is 5°C / h, and the time for the temperature rise and capping reaction is 2h;

[0039] 4) Under uniform mechanical stirring, gradually add 3 parts of epoxy resin dissolved in an organic solvent for chain extension reaction, react for 2 hours after adding, and cool to obtain a terminal-modified curing agent.

[0040] (2) Preparation of epoxy varnish

[0041] 1) Mix 2 parts of organic solvent with 10 parts of epoxy resin, add 0.4 parts of eth...

Embodiment 3

[0047] (1) Modification and preparation of epoxy curing agent

[0048] 1) Add 0.8 parts of nano-SiO to 15 parts of end-capped compound glycidyl tert-carbonate (E10-P) while stirring 2 Powder, and ultrasonic 30min;

[0049] 2) Add 10 parts of diethylenetriamine into the reaction kettle, and when the preset temperature reaches 65°C, slowly add 15 parts of end-capping compound glycidyl tertiary carbonate (E10-P) while stirring;

[0050] 3) After the dropwise addition is completed, the temperature is raised in stages, the temperature rise rate is 5°C / h, and the time for the temperature rise and capping reaction is 2h;

[0051] 4) Under uniform mechanical stirring, gradually add 3 parts of epoxy resin dissolved in an organic solvent for chain extension reaction, react for 2 hours after adding, and cool to obtain a terminal-modified curing agent.

[0052] (2) Preparation of epoxy varnish

[0053] 1) Mix 2 parts of organic solvent with 10 parts of epoxy resin, add 0.4 parts of eth...

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Abstract

The invention relates to a preparation method of a silica modified epoxy resin curing agent and a varnish, and provides a preparation method of a SiO2 modified epoxy resin curing agent and an epoxy varnish paint which has simple process and excellent performance. An end capping reaction carried out for the curing agent by a terminated compound is capable of minimizing the number of the contained active hydrogen bond, reducing the reactive activity of the curing agent, achieving the purpose of controlling the solidification speed and reducing the solidification contraction stress; the epoxy resin is taken as a chain extender of the curing agent so that the compatibility between the curing agent and epoxy resin is enhanced; the tensile strength, aging resistance of the epoxy resin solidified by the SiO2 modification curing agent are improved to a certain extent. The modified curing agent is mixed with epoxy resin, a solvent, an antifoaming agent, a plasticizer and the like under certainoperation technological condition to obtain the viscous and transparent epoxy varnish paint with good water resistance, excellent stretching performance and high luster performance used for woodenware.

Description

technical field [0001] The invention relates to the technical field of surface coating and painting, in particular to a SiO 2 Modified epoxy resin curing agent and preparation method of varnish. Background technique [0002] Clearcoats are essential for wood and metal. It makes it resistant to damage caused by moisture, radiation, biodegradation, mechanochemical damage. The commonly used matrix of varnish coatings is epoxy resin, and epoxy resin itself has a thermoplastic linear structure. After being heated, the solid resin can soften, melt, and become viscous; the liquid resin viscosity decreases when heated. Only after adding curing agent, epoxy resin can be practical. Epoxy resin has excellent adhesion, wear resistance, electrical insulation, high and low temperature resistance, and chemical resistance. It also has the advantages of good adhesion, excellent mechanical properties, low shrinkage, easy processing and low cost. , but the pure epoxy resin has a three-dime...

Claims

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Application Information

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IPC IPC(8): C08G59/50C09D163/00C09D7/12
Inventor 黄定海周媛许丽丽
Owner TIANJIN UNIV