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Polyamide modified polyester resin and preparation method thereof, and automotive primer surfacer containing polyester resin

A technology of polyester resin and modified polyester, which is applied in the field of automotive paint, which can solve the problems of inability to store for a long time and poor stone chip resistance, and achieve enhanced strength and toughness, enhanced stone chip resistance, and excellent mechanical properties. performance effect

Active Publication Date: 2014-12-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the defect that the paint in the existing automobile has poor stone chip resistance and cannot be stored for a long time, so as to provide a car that can improve the stone chip resistance of the paint in the car and can be stored for a long time The polyester resin for intermediate paint and its preparation method also provides an automobile intermediate paint with good stone chipping resistance and long-term storage

Method used

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  • Polyamide modified polyester resin and preparation method thereof, and automotive primer surfacer containing polyester resin
  • Polyamide modified polyester resin and preparation method thereof, and automotive primer surfacer containing polyester resin
  • Polyamide modified polyester resin and preparation method thereof, and automotive primer surfacer containing polyester resin

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preparation example Construction

[0031] The present invention also provides the preparation method of this polyester resin, and this method comprises the following steps:

[0032] S1 In the presence of a catalyst and under the protection of nitrogen, the diamine and excess dibasic acid are subjected to polyamidation reaction to obtain a carboxyl-terminated polyamide polymer;

[0033] S2 Then add diol and triol to the polyamide polymer for esterification reaction to synthesize polyester resin.

[0034] According to the preparation method provided by the present invention, polyamidation reaction is carried out by diamine and excess dibasic acid, and a carboxyl-terminated polyamide oligomer intermediate with small molecular weight is synthesized. The specific reaction is as formula 1. Then, adding dibasic alcohol and tribasic alcohol to the polyamide oligomer intermediate to carry out esterification reaction, and synthesizing a saturated polyester resin modified by polyamide with terminal hydroxyl groups. The ...

Embodiment 1

[0055] This example is used to illustrate a polyester resin for polyamide-modified coating and its preparation method provided by the present invention.

[0056] In a 2L three-necked flask equipped with a water separator, reflux condenser, stirrer and thermometer, add 184.64g of hexamethylenediamine, 609.9g of isophthalic acid, 32.1g of terephthalic acid, 432.375g of adipic acid and 2.45g of catalyst , under the protection of N2, slowly raise the temperature to 110°C, start to stir slowly, slowly raise the temperature to 160°C, keep warm for 1h, add heat stabilizer TP 2 2.45 g of Pi, and then the temperature was raised from 160 °C to 200 °C at a constant speed within 2 h, and kept for 1 h to obtain an intermediate of polyamide oligomer.

[0057] Under the protection of N2, lower the temperature to 140°C, add 557.9g of neopentyl glycol, 120g of trimethylolpropane, slowly raise the temperature to 160°C, keep it warm for 1h, then raise it to 210°C at a rate of 15°C / h, and vacuumi...

Embodiment 2-5

[0059] The polyester resin was prepared according to the method of Example 1, the difference being that each substance and its content are shown in Table 1 below.

[0060] Table 1

[0061] .

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Abstract

The invention provides a polyamide modified polyester resin having the following structure, wherein M represents -(R3-CO-NH-R4-NH-CO)n3-R3-. The invention also provides a preparation method of the polyester resin and an automotive primer surfacer containing the polyester resin. The strength and toughness of the polyester resin are enhanced by modifying saturated polyester resin by using polyamide polymer oligomer with terminal carboxyl groups, so that the saturated polyester resin having excellent mechanical properties used for coatings is obtained. The stone impact-resistant performance of paint films can be enhanced by using the polyester resin in the automotive primer surfacer.

Description

technical field [0001] The invention relates to a polyamide-modified polyester resin, a preparation method thereof, and an automobile interior paint containing the polyester resin. Background technique [0002] As an outdoor means of transportation, cars are always likely to be attacked by various wind, sand and hard objects. [0003] The anti-stone impact performance of automobile surface paint film has put forward higher requirements. Automotive Mid-Painting as Automotive Composite Coatings [0004] Part of the system, it can not only improve the appearance of the topcoat, but also improve the stone chip resistance of the entire coating system, so [0005] This is getting more and more attention. [0006] At present, the main method to improve the stone chip resistance is to modify the polyester resin with blocked isocyanate, or directly add polyisocyanate to the intermediate coating to increase the crosslinking degree of the paint film, thereby improving the stone chip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/685C08G63/78C09D167/00C09D5/00
Inventor 冷世伟胡文
Owner BYD CO LTD
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