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Specific unsaturated polyester resin for manufacturing metal polished particles and preparation method of specific unsaturated polyester resin

A technology of polyester resin and polishing particles, which is applied in the direction of polishing compositions containing abrasives, etc., can solve the problems of low Backko hardness and inability to meet the hardness requirements of metal grinding and polishing, and achieve high Backok hardness, good impact toughness, Effect of low exotherm temperature

Inactive Publication Date: 2016-05-04
CHANGZHOU TIANMA GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A longer gel time will result in a lower Barco hardness of the final product, which cannot meet the hardness requirements of metal grinding and polishing. Therefore, it is still not suitable for mixing with fillers to produce metal grinding and polishing particles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0020] The preparation method of the unsaturated polyester resin specially used in the manufacture of metal grinding and polishing particles of the present embodiment is as follows:

[0021] ①Put phthalic anhydride (referred to as PA, the same below), maleic anhydride (abbreviated as MA, the same below) and propylene glycol (referred to as PG, the same below) into the reactor at a molar ratio of 1.85:1:3 , first raise the temperature to 160°C and react slowly for 0.5h, then slowly raise the temperature to 210°C to 220°C and keep it warm for the reaction.

[0022] When the Gardner bubble viscosity of the material in the reactor reaches T~U and the acid value reaches 26 mgKOH / g (the reaction time in this example is about 12 hours), add hydroquinone accounting for 0.01% of the total weight of the resin to stop the reaction and obtain a polycondensate.

[0023] ②Pump the polycondensate obtained in step ① into the dilution tank that has added styrene (the weight ratio of polyconden...

Embodiment 2～ Embodiment 3）

[0027] Each embodiment is basically the same as Embodiment 1, and the differences are shown in Table 1 and Table 2.

[0028] Table 1

[0029]

[0030] Table 2

[0031]

[0032] As can be seen from Table 2: the viscosity of the unsaturated polyester resin of the present invention can reach about 0.1Pa s, which can ensure that when it is mixed with fillers to make metal grinding and polishing particles, the fillers have a larger amount of addition, thereby ensuring impact High toughness; and the gel time of the unsaturated polyester resin of the present invention is only about 4 minutes (at 25°C, 1% curing agent dosage), so that it can ensure high hardness of Bako.

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Abstract

The invention discloses specific unsaturated polyester resin for manufacturing metal polished particles and a preparation method of the unsaturated polyester resin. The preparation method of the unsaturated polyester resin comprises the following steps: adding phthalic anhydride, maleic anhydride and propylene glycol in a reaction kettle according to a mol ratio of (1.8 to 1.9): 1: (2.9 to 3.1), carrying out a melt phase polycondensation reaction at a temperature of 160 to 220 DEG C, and adding hydroquinone after the reaction is completed to obtain polycondensate; adding the polycondensate to styrene, and stirring to uniformly dilute at the temperature of 50 to 85 DEG C; reducing the temperature of the material to below 50 DEG C, sequentially adding benzoquinone, 2, 5-di-tert-butylhydroquinone, a cobalt-series accelerant and an amine-series accelerant, and uniformly stirring to obtain the finished product. The unsaturated polyester resin is low in viscosity, and short in gelation time; the metal polished particles prepared from the unsaturated polyester resin and filler have high Bacho hardness and good impact toughness.

Description

technical field [0001] The invention relates to an unsaturated polyester resin and a preparation method thereof, in particular to an unsaturated polyester resin specially used for manufacturing metal grinding and polishing particles and a preparation method thereof. Background technique [0002] With the rapid development of the domestic manufacturing industry, the metal grinding and polishing industry has been diversified. Among them, metal grinding and polishing particles made of unsaturated polyester resin mixed with fillers have also been applied and developed in my country. [0003] At present, the viscosity of the existing unsaturated polyester resin products is basically above 0.25Pa·s. When the high-viscosity unsaturated polyester resin is mixed with fillers to produce metal polishing particles, it will affect the amount of fillers added, and the addition of fillers If it is less, it will affect the impact toughness (that is, sanding) of the final product. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/52C08K5/098C08K5/18C08K5/13C09G1/02
CPCC08G63/52C08K5/098C08K5/13C08K5/18C09G1/02
Inventor 徐大云宣维栋
Owner CHANGZHOU TIANMA GROUP CO LTD
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