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Modified polyester and water-borne middle coating composition

A technology of modifying polyester and polyester, applied in the coating and other directions, can solve the problems of poor impact resistance and low gloss, and achieve the effects of good water resistance, good stone resistance and excellent stone resistance.

Active Publication Date: 2011-01-12
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating has low gloss and poor impact resistance

Method used

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  • Modified polyester and water-borne middle coating composition
  • Modified polyester and water-borne middle coating composition
  • Modified polyester and water-borne middle coating composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Add 138g neopentyl glycol, 95g 2-butyl-2-ethyl-1,3-propanediol, 30g Tris Methylolpropane, 18g 1,4-cyclohexanedimethanol, 35g fumaric acid, 52g glutaconic acid, 206g isophthalic acid, 30g 1,4-cyclohexanedicarboxylic acid, 0.5g Swiss Ciba The company's model is 1010 antioxidant and 0.4g of stannous chloride. Slowly raise the temperature of the four-necked bottle to 180°C for reflux dehydration, then raise the temperature to 210°C at a rate of 15°C / 30min, keep warm and reflux for 3 hours, and then depressurize for 3 hours , after cooling down to 60°C, add 60g of propylene glycol monobutyl ether and stir for 20min to obtain a polyester mixture;

[0085] Mix 15g of acrylic acid monomer, 8g of methacrylic acid monomer, 7.5g of isooctyl acrylate monomer, 12g of hydroxyethyl acrylate and 2.6g of azobisisobutyronitrile to obtain an acrylate mixture;

[0086] The temperature of the polyester mixture was raised to 130±5° C. under nitrogen protection, and the acrylate mixture was ...

Embodiment 2

[0090] Add 231g of neopentyl glycol, 28g of trimethylolpropane, 46g of 1,4-cyclohexanedimethanol, 58g of Fumaric acid, 39g glutaconic acid, 62g octadecenedioic acid, 210g 1,4-cyclohexanedicarboxylic acid, 70g adipic acid, 10g phthalic anhydride, 0.1g Swiss Ciba Model is the antioxidant of 1010, the model of 0.8g Swiss Ciba Company is the antioxidant of 1076, 0.3g tin protochloride and 0.2g dibutyl tin oxide, the four-necked bottle is slowly heated up to 200 ℃ of reflux dehydration, Then heat up to 210°C at a rate of 15°C / 30min, keep warm and reflux for 3h, then depressurize for 3h, after cooling down to 60°C, add 40g of propylene glycol monobutyl ether and 38g of diethylene glycol monobutyl ether, and stir for 20min to obtain polyester mixture;

[0091] 40g of acrylic acid monomer, 18g of hydroxyethyl acrylate, 16g of hydroxypropyl acrylate, 20g of styrene and 5.1g of benzoyl peroxide were mixed uniformly to obtain an acrylate mixture;

[0092] The temperature of the polyest...

Embodiment 3

[0096] Add 287g neopentyl glycol, 152g 2-butyl-2-ethyl-1,3-propanediol, 23g trans Butenedioic acid, 24g glutaconic acid, 153g isophthalic acid, 300g adipic acid, 0.6g Swiss Ciba company type 1010 antioxidant, 0.2g dibutyltin dilaurate and 0.3g oxychloride Tin, slowly heat up the four-necked bottle to 190°C for reflux dehydration, then heat up to 210°C at a rate of 15°C / 30min, keep warm and reflux for 3h, then depressurize for 3h, after cooling down to 60°C, add 95g of ethylene glycol monobutyl ether , stirred for 20min to obtain a polyester mixture;

[0097] 23g of acrylic acid monomer, 13g of hydroxyethyl acrylate and 2.1g of azobisisobutyronitrile were mixed uniformly to obtain an acrylate mixture;

[0098] The temperature of the polyester mixture was raised to 130±5° C. under nitrogen protection, and the acrylate mixture was added dropwise at a rate of 12 mL / min. After the dropwise addition, the reaction was continued for 3 hours, and then the temperature was lowered to 5...

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Abstract

The invention provides modified polyester, which is prepared by the following steps of: a) under the action of an antioxidant and a catalyst, reacting polyhydric alcohol and alkene diacid with polybasic acid to obtain polyester; b) adding an aqueous cosolvent into the polyester to obtain a polyester mixture; c) adding a first monomer, a second monomer, a third monomer and a radical initiator into the polyester mixture, and continuously reacting to obtain a first intermediate product, wherein the first monomer is one or two of crylic acid and methacrylic acid, the second monomer is one or more of acrylic ester and styrene, and the third monomer is crylic acid hydroxy ester; and d) adding a neutralizer into the first intermediate product, and stirring for neutralization to obtain the modified polyester. The invention also provides a water-borne middle coating composition. Experiments show that the water-borne middle coating composition has the stone-chip resistance of less than or equal to 3 grade, the impact strength of more than or equal to 50kg.cm and the lustre of 70 to 80 percent at 60 DEG C.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a modified polyester and a water-based intermediate coating composition. Background technique [0002] Automobile body coatings are multi-layer systems, usually including electrophoretic deposition of primer layer, mid-coat layer and topcoat layer. The medium coating can not only increase the adhesion between the primer and the topcoat, but also buffer the impact of the gravel on the road surface on the car surface, protect the primer coating and the substrate from damage, and greatly improve the durability of the primer coating film . In addition, the intermediate coating can also adjust the flatness of the substrate, fill in defects such as blisters and pinholes on the surface of the paint film, form a smooth and delicate intermediate coating surface, improve the vividness and fullness of the topcoat coating, and obtain a better finish. decorative effect. [0003] The prior...

Claims

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Application Information

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IPC IPC(8): C08F283/01C08G63/52C09D151/08C09D7/12
Inventor 张红明李季王献红王佛松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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