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Low-shrink resin for mould pressing technology

A low-shrinkage, resin technology, applied in the field of shrinkage resin for molding, can solve problems such as uneven color, cracking, and local cracks, and achieve the effect of low shrinkage

Inactive Publication Date: 2018-06-22
宜兴市兴合树脂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-shrinkage additives widely used in the market at present, under the premise of ensuring the low-shrinkage effect, will have different degrees of phase migration caused by poor surface smoothness, uneven color, local cracks and even cracks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Low-shrinkage resin for molding process of the present invention, by mass percentage, it comprises,

[0028] (1) Ethylene glycol 18%;

[0029] (2) Propylene glycol 15%;

[0030] (3) Adipic acid 59%;

[0031] (4) Maleic anhydride 7.997%;

[0032] (5) Dibutyltin oxide 0.003%;

[0033] Its preparation method includes,

[0034] (1) Put ethylene glycol, propylene glycol, adipic acid, maleic anhydride and dibutyltin oxide into the reactor in sequence, and raise the temperature to 210°C within 5 hours after feeding, and carry out the heat preservation reaction, and control the temperature of the head of the condenser connected to the reactor at 102°C;

[0035] (2) React for 48 hours, measure the acid value in the middle control to 50±2, then cool to 180 ° C, and carry out the dilution and dilution through the dilution tank connected to the reaction tank, in which styrene with 95% of the total amount of resin is put into the dilution tank, Before diluting, open the coolin...

Embodiment 2

[0037] Low-shrinkage resin for molding process of the present invention, by mass percentage, it comprises,

[0038] (1) Ethylene glycol 16%;

[0039] (2) Propylene glycol 18%;

[0040] (3) Adipic acid 56%;

[0041] (4) Maleic anhydride 9.996%;

[0042] (5) Dibutyltin oxide 0.004%;

[0043] Its preparation method includes,

[0044] (1) Put ethylene glycol, propylene glycol, adipic acid, maleic anhydride and dibutyltin oxide into the reactor in sequence, and raise the temperature to 220°C within 5 hours after feeding, and carry out the heat preservation reaction, and control the temperature of the head of the condenser connected to the reactor at 104°C;

[0045] (2) React for 48 hours, measure the acid value in the middle control to 50±2, then cool to 180°C, and carry out the dilution and dilution through the dilution kettle connected to the reaction kettle, in which styrene with 115% of the total amount of resin is put into the dilution kettle, Before diluting, open the c...

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Abstract

The invention relates to low-shrink resin for a mould pressing technology. The low-shrink resin is prepared from the following components: 15-25% of ethylene glycol, 10-20% of propylene glycol, 55-65%of adipic acid, 5-15% of maleic anhydride and 0.002-0.005% of dibutyltin oxide; a preparation method of the low-shrink resin comprises the following steps: (1) sequentially putting the ethylene glycol, propylene glycol, adipic acid, maleic anhydride and dibutyltin oxide into a reaction kettle; (2) reacting for 48h; measuring the center control acid value at 50+ / -2; cooling to 180 DEG C; discharging and diluting through a dilution kettle connected with the reaction kettle. The low-shrink resin provided by the invention has good compatibility with matrix resin and also can meet the needs of themould pressing technology.

Description

technical field [0001] The invention relates to a shrinkable resin, in particular to a shrinkable resin for molding. Background technique [0002] Composite materials, like other traditional materials, can be further made into various structures and types of final products by many different processing methods or molding methods to meet different application requirements. Among these molding methods, the SMC / BMC molding process is a mechanized operation with a high degree of automation, and is especially suitable for producing high-quality products with high dimensional accuracy requirements, large batches, and excellent appearance. The SMC / BMC process currently occupies a pivotal position in the composite material industry in developed countries in the world, and has a tendency to replace most other processing technologies. [0003] At present, the domestic mold pressing market has basically formed a professional enterprise structure after decades of development, enterprise...

Claims

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Application Information

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IPC IPC(8): C08G63/52C08F283/01
Inventor 韩立春潘伯祥陈彬彬
Owner 宜兴市兴合树脂有限公司
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