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Method for synthesizing unsaturated polyester resin for artificial marble

A technology of artificial marble and polyester resin, applied in the synthesis field of unsaturated polyester resin, which can solve the problems of large curing shrinkage rate, fast curing heat release at room temperature, general boiling water resistance, etc.

Active Publication Date: 2012-05-23
ZHAOQING FUTIAN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of resin can generally meet the requirements of mechanical properties and wettability, but its boiling water resistance is average, the heat release is fast and the curing shrinkage is large when it is cured at room temperature, and it cannot meet the requirements of the "block method" process of artificial stone.

Method used

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  • Method for synthesizing unsaturated polyester resin for artificial marble
  • Method for synthesizing unsaturated polyester resin for artificial marble
  • Method for synthesizing unsaturated polyester resin for artificial marble

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a 2L four-necked flask with a thermometer, stirrer, nitrogen inlet tube and reflux condenser, add 382g diethylene glycol, 588g maleic anhydride and 459g dicyclopentadiene (technical grade, purity is 78- 85%), under the protection of nitrogen, the temperature was raised to 140° C. for reflux reaction for 3 hours, and then the temperature was rapidly raised to 160° C. for reflux reaction until the acid value reached 160 mgKOH / g. Then change the system to a distillation state, add 167g of ethylene glycol, gradually raise the temperature to 205°C and keep warm for further polycondensation until the acid value reaches 55mgKOH / g, and when the water output reaches 85% of the theoretical value, vacuumize to force the water out , make the reaction to an acid value of 25mgKOH / g. Cool down to 190°C, add 0.1g of hydroquinone, stir evenly, cool to 120°C, add 800g of styrene to dilute. Cool and filter to obtain light yellow transparent viscous liquid.

Embodiment 2

[0033] In a 2L four-necked flask with a thermometer, stirrer, nitrogen inlet tube and reflux condenser, add 168g ethylene glycol, 530g maleic anhydride, 70g fumaric acid and 286g dicyclopentadiene (technical grade) successively , with a purity of 80-85%), under the protection of nitrogen, the temperature was raised to 145° C. for reflux reaction for 3 hours, and then the temperature was rapidly raised to 165° C. for reflux reaction until the acid value reached 280 mgKOH / g. Then change the system to a distillation state, add 350g of diethylene glycol, gradually raise the temperature to 200°C, and keep warm until the acid value reaches 50mgKOH / g. To acid value 25mgKOH / g. Cool down to 195°C, add 0.1g of hydroquinone, stir evenly, cool to 125°C, add 700g of styrene to dilute. Cool and filter to obtain light yellow transparent viscous liquid.

Embodiment 3

[0035] In a 2L four-necked flask with a thermometer, a stirrer, a nitrogen inlet tube and a reflux condenser, add 137g propylene glycol, 471g maleic anhydride and 293g dicyclopentadiene (industrial grade, with a purity of 80-85%) successively ), under the protection of nitrogen, the temperature was raised to 142° C. for reflux reaction for 3 hours, and then the temperature was rapidly raised to 160° C. for reflux reaction until the acid value reached 150 mgKOH / g. Then change the system to a distillation state, add 412g of diethylene glycol and 178g of phthalic anhydride, gradually raise the temperature to 210°C, keep warm until the acid value reaches 55mgKOH / g, and then vacuum until the acid value reaches 20mgKOH / g. Cool down to 195°C, add 0.1g of hydroquinone, stir evenly, cool to 120°C, add 780g of styrene to dilute. Cool and filter to obtain light yellow transparent viscous liquid.

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Abstract

The invention provides a method for synthesizing unsaturated polyester resin for artificial marble, which mainly comprises the following steps of: (A) putting unsaturated dibasic acid, unsaturated dibasic acid anhydride, dicyclopentadiene and partial dihydric alcohol in a reaction kettle, heating and performing reflux reaction under the protection of nitrogen, and then heating and performing reflux reaction until a certain acid value is reached; (B) changing the state of the system to a distillation state, adding the residual dihydric alcohol to perform polycondensation reaction, and evacuating to discharge water forcibly when the water discharge quantity reaches 85% to 90% of a theoretical quantity, so that the reaction continues to be below the certain acid value; and (C) lowering the temperature and adding a polymerization inhibitor, diluting with styrene, and cooling and filtering to obtain the finished unsaturated polyester resin. The method provided by the invention is steady and controllable in the reaction process, fast in polycondensation reaction and small in quantity of generated waste water, and the obtained product has the characteristics of steady and slow curing andheat release at normal temperature, small rate of curing shrinkage, excellent boiling water resistance and the like, and can meet the quality demand of the artificial marble.

Description

technical field [0001] The invention belongs to the field of polymer compound synthesis, and in particular relates to a synthesis method of unsaturated polyester resin. Background technique [0002] The production of artificial marble mainly adopts the "block method" process (that is, the normal temperature curing process using cobalt naphthenate-methyl ethyl ketone peroxide curing). The process is to mix natural sandstone of about 80 mesh, ultra-fine stone powder of 300-500 mesh, unsaturated polyester resin, pigment paste and other auxiliary materials through stirring and mixing (of which sandstone accounts for 90-93wt%, and resin accounts for 7-10wt%) , and then put it into a three-dimensional box-type mold, undergo vacuum, high pressure and strong vibration, and then undergo natural hardening (generally cured for 7 days at room temperature) to become a cube block, called "artificial block", and the specification is generally 2.5m×1.25 m×0.85m. Then use a gang saw to cut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/01C08G63/676C08G63/78
Inventor 余桐柏田舜耕
Owner ZHAOQING FUTIAN CHEM IND
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