Preparation method of modified polyester resin and coating containing polyester resin obtained by same

A polyester resin and modification technology, applied in the field of polyester resin, can solve problems such as cracking, inconvenient and quick use, poor flexibility, etc., and achieve the effects of high heat resistance, good flexibility, and good heat resistance

Active Publication Date: 2014-08-27
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating has excellent weather resistance, good adhesion and elasticity, but the modified polyester must be used in conjunction with a polyurethane curing agent, which has the disadvantage of being inconvenient and quick to use
The invention patent application with the publication number CN 102504271A uses a modified silicone resin made of hydroxyl-terminated hyperbranched polyester, which significantly improves the mechanical properties, chemical resistance and water resistance of the silicone resin, but the flexibility is poor, and high and low temperature Will crack under changing conditions, limiting its application

Method used

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  • Preparation method of modified polyester resin and coating containing polyester resin obtained by same
  • Preparation method of modified polyester resin and coating containing polyester resin obtained by same
  • Preparation method of modified polyester resin and coating containing polyester resin obtained by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Preparation of modified hydroxyl-terminated hyperbranched polyester resin

[0034] a) Composition:

[0035] Triol: Trimethylolpropane 134g (1.0mol);

[0036] Isophthalic acid: 107.9g (0.65mol)

[0037] Silanol: Shin-Etsu KR220L 6.7g

[0038] Xylene: 2.68g

[0039] Silicone oligomer: Shin-Etsu silicone resin KR 150 201g

[0040] Crosslinking catalyst: tetrabutyl titanate 1.34g

[0041] Organic solvent: propylene glycol methyl ether acetate 164g

[0042] b) synthesis steps:

[0043] Mix trihydric alcohol and isophthalic acid evenly, heat to 80°C, add silanol and xylene; heat at 180°C for 1 hour, then raise the temperature to 240°C, heat for 1 hour; cool down to 90°C, add trihydric alcohol weight 1.0 times the amount of organic solvent, silicone oligomer and crosslinking catalyst; heat to 110°C for 2 hours; cool down to 90°C, and finally add the remaining organic solvent.

[0044]c) Properties of modified hydroxyl-terminated hyperbranched polyester resin

[004...

Embodiment 2

[0060] 1) Preparation of modified hydroxyl-terminated hyperbranched polyester resin

[0061] a) Composition:

[0062] Triol: Trimethylolpropane 134g (1.0mol);

[0063] Isophthalic acid: 83g (0.5mol)

[0064] Silanols: Hepta(cyclopentyl)silsesquioxane trisilanol 7.4g, Heptaisobutylsilsesquioxane trisilanol 6.0g Xylene: 13.4g

[0065] Silicone oligomer: Shin-Etsu silicone resin KR150 235g, Shin-Etsu KR212 100g

[0066] Crosslinking catalyst: tetrabutyl titanate 1.34g

[0067] Organic solvent: propylene glycol methyl ether acetate 151g butanol 34g

[0068] b) synthesis steps:

[0069] Mix trihydric alcohol and isophthalic acid evenly and heat to 80°C, add silanol and xylene; heat at 200°C for 3 hours, then raise the temperature to 220°C, heat for 2 hours; cool down to 90°C, add propylene glycol methyl ether acetate , silicone oligomer and cross-linking catalyst; heated to 115 ° C, heated for 3 hours; cooled to 90 ° C, and finally added butanol.

[0070] c) Properties of mo...

Embodiment 3

[0085] 1) Preparation of hydroxy silicone oil

[0086] a) Formula

[0087] Octamethylcyclotetrasiloxane: 200g

[0088] Tetramethylammonium hydroxide: 0.02g

[0089] Water: 7.4g

[0090] N,N'-Dimethylformamide (DMF): 60g

[0091] b) Preparation process

[0092] Add octamethylcyclotetrasiloxane, tetramethylammonium hydroxide and DMF sequentially in the reactor equipped with condenser tube, thermometer, dropping funnel and stirrer, then start stirring and raise the temperature to 90°C Finally, keep the temperature constant, and add distilled water dropwise under stirring. After the dropwise addition is completed, after 9.5 hours of constant temperature reaction, the temperature is raised to 150°C for 1 hour, and the temperature is lowered to 80°C. Start vacuum distillation, and the pressure is controlled at 0.06MPa, and the reaction is evaporated. The small molecules produced in the process were cooled to room temperature, and the solid content was adjusted to 60% to obtain ...

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Abstract

The invention relates to a preparation method of a modified carboxyl-terminated hyperbranched polyester resin. The method comprises the following steps of: mixing triol and isophthalic acid with molar weight being 0.5-1.0 time that of triol uniformly, then heating the mixture to 70-90 DEG C and adding silanol with weight being 0.05-0.1 time that of triol and dimethylbenzene with weight being 0.02-0.1 time that of triol; heating the materials at 180-210 DEG C for 1-3 hours, then continuously raising the temperature to 220-240 DEG C and carrying out heating for 1-3 hours; then reducing the temperature to 90 DEG C and adding organic solvents with weight being 1.0-1.5 times that of triol, organic silicon oligomers with weight being 1.5-2.5 times that of triol and a crosslinking catalyst with weight being 1-5% that of triol, raising the temperature to 110-120 DEG C and carrying out heating for 2-3 hours; and finally reducing the temperature to 90 DEG C, adding other organic solvents and regulating the solid content to be 60-70%. The preparation method has the beneficial effects that as silanol is added when polyester is synthesized, the heat resistance and flexibility of polyester are improved; as the organic silicon oligomers and polyester are subjected to crosslinking reaction, the heat resistance of polymer is improved; and the polyester resin prepared by the method can be used for preparing a coating with high temperature resistance and good flexibility.

Description

technical field [0001] The invention relates to the field of organic polymer compounds, and relates to a polymer compound obtained by an esterification reaction, in particular to a polyester resin. Background technique [0002] Polyester resin has excellent metal adhesion, good physical and mechanical properties such as high hardness and good chemical corrosion resistance, and is widely used in the coating industry. However, polyester resin has the disadvantages of poor heat resistance, low water resistance and poor weather resistance, which limit its application in high temperature resistant coatings. In order to improve the high temperature resistance of polyester resin, other resins are often used to chemically modify it. Silicone is an organic-inorganic hybrid material with excellent heat resistance, weather resistance, water resistance and low surface tension. Using silicone resin to modify polyester resin can improve the heat resistance, water resistance and chemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/695C08G63/85C09D167/00
Inventor 刘海兵李希
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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