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Preparation method of terephthalic type unsaturated polyester resin

A polyester resin and unsaturated technology, applied in the field of preparation of unsaturated polyester resin, can solve the problems of production and application limitations, difficult reaction, poor polyester compatibility, etc., and achieves low production cost, high reactivity, Excellent product performance

Active Publication Date: 2013-08-28
山东宏信化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction is difficult, and the polyester produced by reacting with symmetrical structural diols has poor compatibility with styrene, which limits its production and application.

Method used

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  • Preparation method of terephthalic type unsaturated polyester resin
  • Preparation method of terephthalic type unsaturated polyester resin
  • Preparation method of terephthalic type unsaturated polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 200 g of terephthalic acid, 266 g of ethylene glycol, and 0.5 g of monobutyltin oxide into a reaction kettle equipped with a thermometer, a stirrer, a nitrogen inlet pipe and a condenser, and stir evenly. Rapidly raise the temperature to 160°C, pay attention to controlling the temperature of the distillation head, then gradually raise the temperature to 205°C, and react until the acid value is lower than 10mgKOH / g. Add 185g of propylene glycol, 83g of ethylene glycol, 184g of phthalic anhydride, 432g of maleic anhydride, and 0.045g of methylhydroquinone under stirring conditions, then gradually raise the temperature to 200°C, control the temperature of the distillation head, and react When the acid value is lower than 70mgKOH / g, polycondense under the vacuum degree of -0.07Mpa until the acid value is lower than 40mgKOH / g, cool down to 180°C and add 0.23g of methyl hydroquinone, cool down to 120°C and add 497.9g of styrene, After stirring evenly, the product p-phenyl...

Embodiment 2

[0029] Add 200 g of terephthalic acid, 177.7 g of propylene glycol, and 0.32 g of stannous octoate into a reaction kettle with a thermometer, a stirrer, a nitrogen inlet pipe and a condenser, and stir evenly. Rapidly raise the temperature to 170°C, pay attention to controlling the temperature of the distillation head, then gradually raise the temperature to 210°C, and react until the acid value is lower than 10mgKOH / g. Add 85g of butanediol, 183g of diethylene glycol, 150g of phthalic anhydride, 356g of fumaric acid, and 0.027g of hydroquinone under stirring conditions, then gradually raise the temperature to 200°C, and control the distillation head Temperature, react until the acid value is lower than 70mgKOH / g, polycondense at a vacuum degree of -0.08Mpa until the acid value is lower than 40mgKOH / g, cool down to 180°C and add 0.28g of hydroquinone, cool down to 120°C and add 456g of styrene, 155g of methyl methacrylate, after being stirred evenly, the product p-phenylene typ...

Embodiment 3

[0031] Add 200 g of terephthalic acid, 289 g of diethylene glycol, and 0.14 g of dimethyl tin into a reaction kettle equipped with a thermometer, a stirrer, a nitrogen inlet pipe and a condenser, and stir evenly. Rapidly raise the temperature to 180°C, pay attention to controlling the temperature of the distillation head, then gradually raise the temperature to 215°C, and react until the acid value is lower than 10mgKOH / g. Add 286g of dipropylene glycol, 225g of succinic acid, 322g of maleic acid, and 0.055g of p-tert-butylcatechol under stirring conditions, and then gradually raise the temperature to 200°C, control the temperature of the distillation head, and react until the acid value is low Polycondensate at 70mgKOH / g under vacuum degree -0.09Mpa until the acid value is lower than 40mgKOH / g, add 0.10g of p-tert-butylcatechol when cooled to 180°C, add 710g of divinylbenzene when cooled to 120°C, stir evenly The resulting product is phenylene type unsaturated polyester resin...

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Abstract

The invention relates to a preparation method of unsaturated polyester resin and particularly relates to a preparation method of terephthalic type unsaturated polyester resin. The preparation method comprises an esterification-polycondensation reaction and a cross linking reaction, wherein saturated binary acids and organic tin catalysts are added in the esterification-polycondensation reaction. The problem of poor compatibility between styrene and polyesters generated by the reaction among terephthalic acid, other acids and dihydric alcohol with a symmetric structure is solved through adjusting the quantities of terephthalic acid and other acids. The saturated binary acids are used in the preparation method, so that the compatibility between styrene and the polyesters is greatly improved, and the flexibility of the resin is enhanced; and unsaturated polyester resin prepared by using the organic tin catalysts is high in reaction activity and easy to completely cure. The preparation method has the advantages of simple synthesis process, low production cost, excellent product performance, environmental friendliness and no generation of three wastes.

Description

technical field [0001] The invention relates to a preparation method of unsaturated polyester resin, in particular to a preparation method of p-phenylene type unsaturated polyester resin. Background technique [0002] The heat resistance of p-phenylene unsaturated polyester resin is comparable to that of bisphenol A corrosion-resistant saturated resin, its acid resistance and alkali resistance are higher than those of general-purpose polyester, and its resistance to organic solvents is even better than that of other types of unsaturated polyester. Resin is incomparable. P-phenylene unsaturated polyester resin is a resin with high heat resistance, solvent resistance, corrosion resistance, liquid and gas permeability resistance, electrical properties and mechanical properties. It is used as FRP grating resin, widely used in transportation, shipping, aviation, chemical anti-corrosion and other fields. [0003] P-phenylene unsaturated polyester resin has been valued because of...

Claims

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Application Information

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IPC IPC(8): C08F283/01C08G63/676C08G63/52C08G63/85
Inventor 张富林解德琪王倩
Owner 山东宏信化工股份有限公司
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