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Polyester polyol and its preparation method and application

A polyurethane elastomer and reaction kettle technology, applied in the field of application and synthesis of new chemical materials, can solve the problems of limited product performance and harsh production environment, and achieve the effects of strong crystallinity, long service life and high hardness

Active Publication Date: 2016-03-09
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurethane elastomers prepared from adipic acid polyester polyols are suitable for products with a Shore hardness below 95A. For high-hardness products, it is necessary to increase the amount of free isocyanate to increase the hardness. Too much free isocyanate will easily lead to harsh production environments and Product performance limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 4672Kg of adipic acid, 5312Kg of terephthalic acid, 4992Kg of ethylene glycol, and 1.5Kg of catalyst tetrabutyl titanate into the reaction kettle in sequence; seal the kettle with nitrogen, and control the reflux tower top temperature at 101°C after heating to 140°C. Heat up to 220°C at a heating rate of 10°C per hour, and react at 220°C for 3 hours. When the water output rate reaches above 90%, control the water output rate to 200Kg / h, and turn on the vacuum pump to evacuate until the acid value drops below 1.0mgKOH / g , to prepare a polyester polyol with a hydroxyl value of 113.18mgKOH / g and an acid value of 0.30mgKOH / g, and use it with TDI-100 to synthesize a prepolymer with an isocyanate weight content of 6.2%. The prepolymer The polyurethane elastomer is obtained by reacting with MOCA according to the mass ratio of 100:17.7.

[0023] The performance is as follows: hardness 69D, rebound 37%, tear strength: 195.58KN / m, DIN abrasion: 43.23mm 3 , while the polyuret...

Embodiment 2

[0025] Add 3776Kg of succinic acid, 666.3Kg of terephthalic acid, 3109Kg of ethylene glycol, and 0.13Kg of tetrabutyl titanate as the catalyst; seal the kettle with nitrogen, heat it to 145°C and control the top temperature of the reflux tower at 102°C , raise the temperature to 222±2℃ at a heating rate of 15℃ per hour, and react at 222±2℃ for 2.5 hours. When the water output rate reaches more than 90%, control the water output rate to 1200Kg / h, and turn on the vacuum pump to evacuate to the acid value Reduced to below 1.0mgKOH / g, the temperature? Prepare a hydroxyl value of 112.90mgKOH / g, polyester polyols with an acid value of 0.29mgKOH / g, use it to synthesize a prepolymer with an isocyanate weight content of 4.5% with MDI-100, and combine the prepolymer with BDO reacted according to the mass ratio of 100:4.6 to obtain polyurethane elastomer.

[0026] The performance is as follows: hardness 49D, rebound 34%, tear strength: 152.38KN / m, DIN abrasion: 40.77mm 3 , while the pe...

Embodiment 3

[0028] Add 1332Kg of adipic acid, 7548Kg of terephthalic acid and 6216Kg of butanediol in the reaction kettle successively. The catalyst is 0.35Kg of stannous octoate; The heating rate per hour is raised to 223°C, and the reaction is carried out at 223°C for 4 hours. When the water yield reaches more than 90%, the water yield rate is controlled to 1000Kg / h, and the vacuum pump is turned on to evacuate until the acid value drops below 1.0mgKOH / g. Prepare hydroxyl value 76.02mgKOH / g, the polyester polyol of acid value 0.37mgKOH / g, use it to synthesize the prepolymer that isocyanate weight content is 3.6% with liquefied MDI, this prepolymer and E -300 According to the mass ratio of 100:6.87 reaction to obtain polyurethane elastomer.

[0029] The performance is as follows: hardness 77D, rebound 39%, tear strength: 219.37KN / m, DIN abrasion: 36.21mm 3 , while the performance of polyurethane elastomer made of polyester polyol synthesized by adipic acid under the same conditions is a...

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Abstract

The invention belongs to the technical field of novel chemical material synthesis and application and relates to polyester polyol as well as a preparation method and an application thereof. The preparation method comprises the steps: adopting binary acid and polyol, in the presence of a catalyst, and carrying out polycondensation on the binary component and the polyol component to produce the polyester polyol, wherein the mass ratio of the binary, the catalyst and micromolecule polyol is 100:(0.003-0.015):(50-100); and carrying out synthesis on the polyester polyol and isocyanate to obtain a prepolymer, and carrying out reaction on the isocyanate and a chain extender to obtain a polyurethane elastomer, wherein the weight content of isocyanato in the prepolymer is 2.1-28 percent. The polyester polyol is strong in the polyurethane elastomer rigidity, good in the rebound force, good in the abrasive resistance, strong in the bearing capacity, strong in the tear strength, and long in the service life. With the adoption of the polyurethane elastomer, as the crystallinity is strong and the high temperature resistance is good, the freeness of diisocyanate is reduced, the working environment is improved, the environmental pollution is alleviated, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of synthesis and application of new chemical materials, and relates to a polyester polyol and its preparation method and application. Background technique [0002] Polyester polyol is one of the most important raw materials of polyurethane elastomer. The polyurethane elastomer material prepared by reacting with diisocyanate has the characteristics of good wear resistance, high rebound, and good solvent resistance. It is used in casters, solvent-resistant adhesives, etc. Rollers, industrial belts, mining sieve plates and other fields have been widely used. At present, polyester polyols for polyurethane elastomers are mostly prepared by reacting adipic acid with ethylene glycol, butanediol, propylene glycol, trimethylolpropane, and diethylene glycol. Polyurethane elastomers prepared from adipic acid polyester polyols are suitable for products with a Shore hardness below 95A. For high-hardness products, it is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/127C08G63/78C08G18/76C08G18/42C08G18/32C08G18/10C08G18/48
Inventor 贾雪芹高振胜陈海良董良代金辉肖磊
Owner SHANDONG INOV POLYURETHANE
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