Polyester resin with high levelling property and preparation method thereof

A technology of polyester resin and performance, applied in the field of polyester resin with high leveling performance and its preparation, can solve the problems of high cost and unsuitability for large-scale production, etc., and achieve the effect of reducing cost and high leveling.

Pending Publication Date: 2019-03-26
HUANGSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing technology, in the case of ensuring that all performances are up to standard, the cost is relatively high, and it is not suitable for large-scale production

Method used

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  • Polyester resin with high levelling property and preparation method thereof
  • Polyester resin with high levelling property and preparation method thereof
  • Polyester resin with high levelling property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of embodiment 1 polyester resin

[0031] In this embodiment, 5 repeated experiments were set up, and the amounts of raw materials are shown in Table 1 below, and the following steps were used to prepare the polyester resin.

[0032] Table 1 raw material consumption

[0033] raw material

[0034] Note: Among the above raw materials, polyester chips are high molecular weight polyester chips K2100.

[0035] The preparation steps are:

[0036] (1) Accurately weigh the raw materials in Table 1, add neopentyl glycol, diethylene glycol, ethylene glycol, propylene glycol and trimethylolpropane in sequence in the reactor, and heat to a temperature of 60°C; The volume of the reaction kettle is selected according to the amount of raw materials;

[0037] (2) After the heating is completed, continue to add terephthalic acid, silicon oxide, monobutyltin oxide and polyester chips to the reaction kettle successively, heat up and continue to stir, and contin...

Embodiment 2

[0073] The preparation of embodiment 2 powder coatings

[0074] In this example, the polyester resins prepared from the five formulations in Example 1 were used to prepare powder coatings, and the amounts of raw materials are shown in Table 7 below.

[0075] Table 7 raw material consumption

[0076]

[0077] The steps of preparation are:

[0078] (1) Accurately weigh the raw materials in Table 7, add titanium dioxide, precipitant, leveling agent, brightener, benzoin and wax into the mixing tank, and mix well;

[0079] (2) Pour the mixed material into a twin-screw extruder, and melt and extrude it at 200°C;

[0080] (3) Cool the extruded material to room temperature, remove the material at the beginning of extrusion, and avoid the last remaining solid in the twin-screw extruder;

[0081] (4) Put the cooled material into a pulverizer to pulverize 3 to 4 times, and pass the pulverized material through a 500-mesh sieve;

[0082] (5) Take a part of the sieved fine pow...

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Abstract

The invention provides polyester resin with a high levelling property, and a preparation method thereof. According to the specific technical scheme, the polyester resin with the high levelling property comprises the following raw materials according to the parts by weight: 32.4-34.9 parts of dihydric alcohol, 70.8-72.2 parts of polybasic acid, 0.5-0.8 part of trimethylolpropane, 1.6-1.8 parts of anti-sticking agent, 0.001-0.01 part of polyester chips, 0.07-0.15 part of antioxidant, 0.3-0.6 part of curing accelerator and 0.3-0.7 part of surface active agent. The polyester resin with the high levelling property solves the problem that the raw materials of the polyester resin in the prior art have high cost and are not suitable for large-scale production; the polyester resin prepared by the method reduces the cost and has the excellent levelling property; and various properties of the polyester resin reach the standard.

Description

technical field [0001] The invention relates to a polyester resin with high leveling performance and a preparation method thereof. Background technique [0002] Polyester resin is the most used resin raw material in my country's powder coating industry. Polyester resin for powder coating is a high molecular polymer obtained by polycondensation reaction of polybasic acid and polyhydric alcohol. When designing the formula of polyester resin for powder coating, it is necessary to consider The storage stability and leveling of powder coatings, the pulverization of polyester resin, the weather resistance of coating films, etc., and the main factors affecting these performance characteristics are the selection of polybasic acid or polyol, reasonable alkyd equivalent ratio and control The degree of reaction and process conditions are the key technologies for preparing high molecular weight polyester resin. However, in the existing technology, in the case of ensuring that all perform...

Claims

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Application Information

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IPC IPC(8): C08G63/668C08G63/85C09D167/00C09D5/03C09D7/61C09D7/63C09D7/65
CPCC08G63/668C08G63/85C08G2150/20C08K2003/2241C09D5/033C09D167/00C08K13/02C08K3/36C08K5/526C08K5/17C08K5/09C08K3/22
Inventor 江蓉黄良芳李长江
Owner HUANGSHAN UNIV
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