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Preparation method of modified polyester resin and coating containing polyester resin

A polyester resin and modification technology, applied in the field of polyester resin, can solve the problems of poor flexibility, poor flexibility of modified polyester, and low resistance to alternating heat and cold, and achieve good flexibility, good heat resistance, The effect of high heat resistance

Active Publication Date: 2013-03-20
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
Li Huagong et al. (Li Huagong et al., Synthesis of organosilicon-modified hydroxyl-terminated polyesters, Synthetic Resins and Plastics, 2012, 29 (2): 20~23) used organosilicon prepolymers to modify hydroxyl-terminated polyesters to improve polyester Excellent heat resistance and salt water resistance, but the modified polyester has poor flexibility and low resistance to alternating cold and heat
The invention patent application with the publication number CN102504265A uses saturated polyester and epoxy resin to cross-link the silicone intermediate to prepare a polyester-modified silicone resin, which has good heat resistance, low surface tension, and excellent Boiling resistance and acid and alkali resistance, but poor flexibility, it will crack under high and low temperature conditions, which limits its application

Method used

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  • Preparation method of modified polyester resin and coating containing polyester resin
  • Preparation method of modified polyester resin and coating containing polyester resin
  • Preparation method of modified polyester resin and coating containing polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Preparation of modified polyester resin

[0034] a) Composition:

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

[0036] Diol: neopentyl glycol 10.4g (0.1mol);

[0037] Isophthalic acid: 107.9g (0.65mol)

[0038] Silanol: Shin-Etsu KR220L 6.7g

[0039] Xylene: 2.74g

[0040] Silicone oligomer: Shin-Etsu silicone resin KR 150 229g

[0041] Cross-linking catalyst: tetrabutyl titanate 2.5g

[0042] Organic solvent: propylene glycol methyl ether acetate 310g

[0043] b) synthesis steps:

[0044] Mix trihydric alcohol, dihydric 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, and heat for 1 hour; cool down to 90°C, add three Organic solvent 1.0 times the weight of alcohol, silicone oligomer and crosslinking catalyst; heat to 110°C for 2h; cool down to 90°C, and finally add the remaining organic solvent.

[0045] c) Properties of modified polyester resin

[0046] Comprehen...

Embodiment 2

[0065] 1) Preparation of modified polyester resin

[0066] a) Composition:

[0067] Triol: Trimethylolpropane 134g (1.0mol);

[0068] Diol: neopentyl glycol 1.04g (0.01mol); 2-methyl 1,3-propanediol 0.9g (0.01mol)

[0069] Isophthalic acid: 83g (0.5mol)

[0070] Silanol: Hepta(cyclopentyl)silsesquioxane trisilanol 7.4g, Heptaisobutylsilsesquioxane trisilanol 6.0g

[0071] Xylene: 13.4g

[0072] Silicone oligomer: Shin-Etsu silicone resin KR150 100g, Shin-Etsu KR212 71g

[0073] Crosslinking catalyst: tetrabutyl titanate 1.34g

[0074] Organic solvent: propylene glycol methyl ether acetate 151g butanol 34g

[0075] b) synthesis steps:

[0076] Mix trihydric alcohol, dihydric alcohol and isophthalic acid evenly, heat to 80°C, add silanol and xylene; heat at 200°C for 3 hours, heat up to 220°C, heat for 2 hours; cool down to 90°C, add propylene glycol Methyl ether acetate, silicone oligomer and cross-linking catalyst; heat to 115°C for 3h; cool down to 90°C, and finally a...

Embodiment 3

[0092] 1) Preparation of hydroxy silicone oil

[0093] a) Formula

[0094] Octamethylcyclotetrasiloxane: 200g

[0095] Tetramethylammonium hydroxide: 0.02g

[0096] Water: 7.4g

[0097] N,N'-Dimethylformamide (DMF): 60g

[0098] b) Preparation process

[0099] 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 polyester resin. The method comprises the following steps of: mixing triol, diol with molar weight being 0.02-0.1 time that of 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 raising the temperature to 220-240 DEG C and carrying out heating for 1-3 hours; 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; heating the materials to 110-120 DEG C and carrying out heating for 2-3 hours; and reducing the temperature to 90 DEG C, finally 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 resins have 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 resistance of polyester resin. ...

Claims

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Application Information

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IPC IPC(8): C08G63/695C08G63/85C09D167/00
Inventor 刘海兵李希
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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