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Hyper-branched polyester polyol and preparation method thereof

A hyperbranched polyester and polyol technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of low softening breakdown temperature, low inflection point temperature, and high raw material prices, and achieve low production costs. The method is simple and the effect of increasing the cross-linking point

Active Publication Date: 2016-06-01
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of the experimental technical plan, there are still some shortcomings, such as high raw material prices, low softening breakdown temperature, low inflection point temperature of dielectric loss curve, poor thermal shock performance, etc.

Method used

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  • Hyper-branched polyester polyol and preparation method thereof
  • Hyper-branched polyester polyol and preparation method thereof
  • Hyper-branched polyester polyol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of polyester polyol

[0044] Add 495.1g terephthalic acid, 581.2g phthalic anhydride, 307.1g adipic acid, 254.7g ethylene glycol, 617.6g glycerol, 186.5g 2-methyl-1,3-propanediol and 24.4g zinc acetate into the reactor in sequence . Start the heating device, slowly increase the temperature to 190°C, maintain the temperature for about 1 hour, and slowly increase the temperature to 210°C until the system is completely clear and transparent. 1470.6 g of xylene was added, and the reaction was maintained at 210°C for 1 hour. Exhaust xylene at 210°C and 0.03-0.05MPa negative pressure for 15 minutes.

Embodiment 2

[0046] Preparation of hyperbranched polyester polyol

[0047] Add 1122.8g of 2,2-dimethylolpropionic acid and 35.6g of p-toluenesulfonic acid into the reaction kettle, and slowly raise the temperature to 180°C for about 3 to 4 hours. Add 1663.5g of xylene and maintain 180°C for about 3 hours. Extract xylene at 180°C and 0.03-0.05MPa negative pressure for 30 minutes.

Embodiment 3

[0049] One-step preparation of hyperbranched polyester polyol (1:2)

[0050] Add 2245.6g of 2,2-dimethylolpropionic acid and 46.9g of p-toluenesulfonic acid into the reaction kettle, and slowly raise the temperature to 180° C. to react for about 3 to 4 hours. Add 1856.4g of xylene and maintain 180°C to react for about 3 hours. Extract xylene at 180°C and 0.03-0.05MPa negative pressure for 30 minutes.

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Abstract

The invention provides hyperbranched polyester polyol for polyurethane wire coating enamel and a preparation method of the hyperbranched polyester polyol. The hyperbranched polyester polyol has the characteristics of high branching, low intermolecular winding possibility, large quantities of branch chains and terminated functional groups, three-dimensional net structure and the like. The preparation method comprises the following steps: taking polyatomic alcohol, polyacidand polybasic anhydride as main raw materials to prepare polyester polyol; then, adding 2,2-dimethylolpropionic acid to prepare the hyperbranched polyester polyol. The preparation method is simple; multistep separation purification is eliminated; the production cost is relatively low; the suitability for large-scale industrial production is high. The wire coating enamel prepared from the hyperbranched polyester polyol is excellent in hot impact resistance and soft breakdown resistance, low in dielectric loss, and high in tin-lead bonding performance.

Description

Technical field [0001] The present invention relates to the technical field of polymer materials, in particular to a preparation method of polyester polyol, in particular to a hyperbranched polyester polyol used for polyurethane wire enamel and a preparation method thereof. Background technique [0002] Enameled wire paint is a kind of electrical insulating paint specially used to make enameled wires. It is a kind of special paint for coating wires, motors and electrical equipment. It is made on the surface of various specifications of naked copper wires, aluminum wires and alloy wires. Various enameled wires are one of the key raw materials to control the economic and technical indicators and operating life of electrical equipment. [0003] Polyurethane wire enamel is an important type of wire enamel. In addition to the performance of general enameled wire paint, it also has the following characteristics: good direct solderability, no need to remove the paint layer before welding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/127C08G63/91C09D175/06
CPCC08G63/127C08G63/914C09D175/06
Inventor 宁春花周弟左晓兵吉汪冲张涵陈奠宇金鸿伟
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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