A kind of polyester resin for powder coating with trimellitic anhydride as raw material and its preparation method and application
A technology of trimellitic anhydride and polyester resin, which is applied in powder coatings, polyester coatings, coatings, etc., can solve the problem of insufficient weather resistance of polyester resins and the inability of polyester powder coatings to meet market needs and limit polyester Promote the application of powder coatings and other issues to achieve the effect of improving performance, excellent heat resistance, and reducing costs
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Embodiment 1
[0033] A kind of preparation method taking trimellitic anhydride as raw material powder coating polyester resin, its step comprises:
[0034] (1) First add a certain proportion of mixed solution of water, butanol and butyl acetate, heat it, keep the temperature at 20°C, and add phenyltrichlorosilane, methyltrichlorosilane and dimethyldichlorosilane dropwise while stirring Mixed liquid with xylene; after the reaction, wash the reactant with water to be neutral, continue to heat to 110°C, carry out condensation reaction, control the transparency of the reactant until the solid content is greater than 70%, and obtain the organosilicon intermediate;
[0035] (2) In the reaction kettle, raise the temperature of the kettle to 80°C, add 13 parts of diethylene glycol, 13 parts of cyclohexanediol, 13 parts of 2-methyl-1,3 propanediol, trimethylolpropane 1 part, 50 parts of isophthalic acid, 0.2 part of catalyst tetraisobutyl titanate;
[0036] (3) Gradually increase the temperature of...
Embodiment 2
[0048] A kind of preparation method taking trimellitic anhydride as raw material powder coating polyester resin, its step comprises:
[0049] (1) First add a certain proportion of the mixed solution of water, butanol and butyl acetate, heat it, keep the temperature at 25°C, and add phenyltrichlorosilane, methyltrichlorosilane and dimethyldichlorosilane dropwise while stirring Mixed liquid with xylene; after the reaction, wash the reactant with water to be neutral, continue to heat to 110°C, carry out condensation reaction, control the transparency of the reactant until the solid content is greater than 70%, and obtain the organosilicon intermediate;
[0050] (2) In the reaction kettle, raise the temperature of the kettle to 80°C, add 18 parts of diethylene glycol, 18 parts of cyclohexanediol, 18 parts of 2-methyl-1,3 propanediol, trimethylolpropane 3 parts, 60 parts of isophthalic acid, 0.5 part of catalyst tetraisobutyl titanate;
[0051] (3) Gradually increase the temperatu...
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