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Aromatic polyester polyol with good compatibility with cyclopentane and preparation method thereof

A technology of aromatic polyester and aromatic dibasic acid, which is applied in the field of aromatic polyester polyol and its preparation, can solve the problems of poor compatibility between aromatic polyester polyol and pentane, and achieves high yield, The effect of simple reaction operation and few by-products

Active Publication Date: 2019-06-28
SHANGHAI HUAFENG MATERIAL TECH RES INST LLP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the compatibility of conventional aromatic polyester polyols for rigid foams with pentane is relatively poor

Method used

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  • Aromatic polyester polyol with good compatibility with cyclopentane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a 1000ml reaction flask equipped with a stirrer, nitrogen protection and condensing reflux device, add 371.98g, 2.51mol of phthalic anhydride and 41.72g, 0.25mol of terephthalic acid, 406.56g, 4.52mol of 1,3 -Butanediol, 79.73g, 0.59mol of trimethylolpropane, start stirring, slowly heat up to 180-190°C, turn on nitrogen, after 60 minutes of reaction, heat up to 220-230°C, carry out esterification dehydration reaction, 220- After holding at 230°C for 120 minutes, carry out polycondensation reaction by vacuum distillation, and check the acid value and hydroxyl value every 60 minutes. After the acid value and hydroxyl value are qualified, the temperature is lowered to below 100°C, and the material is packaged.

[0023] The hydroxyl value of the synthetic polyester polyol of the present embodiment is 310mgKOH / g, and the acid value is 3.1mgKOH / g;

[0024] The number average molecular weight of the synthetic polyester polyol of the present embodiment is 430;

[0025] The ...

Embodiment 2

[0027] In a 1000ml reaction flask equipped with a stirrer, nitrogen protection and condensing reflux device, add 348.86g, 2.36mol of phthalic anhydride and 65.22g, 0.39mol of terephthalic acid, 426.44g, 4.74mol of 1,3 -Butanediol, 59.48g, 0.44mol of trimethylolpropane, start stirring, slowly heat up to 180-190°C, turn on nitrogen, after 60 minutes of reaction, heat up to 220-230°C, carry out esterification dehydration reaction, 220- After holding at 230°C for 120 minutes, carry out polycondensation reaction by vacuum distillation, and check the acid value and hydroxyl value every 60 minutes. After the acid value and hydroxyl value are qualified, the temperature is lowered to below 100°C, and the material is packaged.

[0028] The hydroxyl value of the polyester polyol synthesized by the present embodiment is 310mgKOH / g, and the acid value is 3.4mgKOH / g;

[0029] The number average molecular weight of the polyester polyol synthesized by the present embodiment is 416;

[0030] ...

Embodiment 3

[0032] In a 1000ml reaction flask equipped with a stirrer, nitrogen protection and condensing reflux device, add 349.54g, 2.36mol of phthalic anhydride and 49.0g, 0.29mol of terephthalic acid, 388.53g, 4.32mol of 1,3 -Butanediol, 112.91g, 0.84mol of trimethylolpropane, start stirring, slowly heat up to 180-190°C, turn on nitrogen, after 60 minutes of reaction, heat up to 220-230°C, carry out esterification dehydration reaction, 220- After holding at 230°C for 120 minutes, carry out polycondensation reaction by vacuum distillation, and check the acid value and hydroxyl value every 60 minutes. After the acid value and hydroxyl value are qualified, the temperature is lowered to below 100°C, and the material is packaged.

[0033] The hydroxyl value of the polyester polyol synthesized by the present embodiment is 350mgKOH / g, and the acid value is 2.5mgKOH / g;

[0034] The number average molecular weight of the synthetic polyester polyol of present embodiment is 400;

[0035] The yi...

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Abstract

The invention discloses an aromatic polyester polyol having good compatibility with cyclopentane, and a preparation method of the aromatic polyester polyol. The preparation method comprises the following steps: reacting a dibasic alcohol and trihydric alcohol mixture with an aromatic dibasic acid and aromatic dibasic anhydride mixture, then heating, performing transesterification, and then performing decompression distillation for polycondensation, so as to obtain the aromatic polyester polyol. The prepared aromatic polyester polyol can be used for permanent flame-retardant modification of polyurethane products compared with the conventional polyester polyol, and can be compatible with cyclopentane compared with the conventional aromatic polyol. The preparation method is simple in reaction operation, raw materials are easily available, side products in production processes are fewer, the pollution is little, the reaction steps are fewer, the preparation method is an environment-friendly and pollution-free production method, industrial production can be carried out, and the yield is higher and can be kept at more than 88%.

Description

technical field [0001] The invention relates to an aromatic polyester polyol and a preparation method thereof. Background technique [0002] Polyurethane rigid foam is a foam material formed by addition polymerization and foaming of polyols and isocyanates as raw materials under the action of catalysts and foaming agents. With small thermal conductivity, light density, high mechanical properties, good water resistance and aging resistance, it is a widely used insulation material in the world. However, certain flame retardancy is required. Aromatic polyester polyols are a class of chemical intermediates with a wide range of uses. Because of their higher flame retardancy than aliphatic polyester polyols and ordinary polyether polyols, they are widely used in polyols Isocyanurate rigid foam. Aromatic polyester polyols are produced by polycondensation of phthalic anhydride, terephthalic acid, etc. and diols. [0003] At present, in the field of rigid polyurethane foam in my c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/20C08G63/78C08G18/42
CPCC08G18/4219C08G63/20C08G63/78
Inventor 肖丽群朱彦唐海华唐劲松
Owner SHANGHAI HUAFENG MATERIAL TECH RES INST LLP
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