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Polyester polyol with improved low-temperature fluidity and preparation method thereof

A technology of polyester polyol and low-temperature fluidity, which is applied in the field of polyester polyol, can solve problems such as waste, and achieve the effects of recycling, improving product compatibility, and good low-temperature fluidity

Inactive Publication Date: 2018-11-20
SHANGHAI LIANSHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These PTA residues with recycling value are directly discarded or buried, causing great waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment relates to the method for synthesizing polyester polyol.

[0052] First, add 10000kg of purified terephthalic acid residue (Shanghai Petrochemical), 3000kg of 2-ethyl-1,3-hexanediol, 9200kg of diethylene glycol, 2400kg of glycerin, 100kg of hypophosphorous acid and 60kg of of zinc acetate. Raise the temperature to 70°C, vacuumize and fill with nitrogen to maintain the nitrogen atmosphere.

[0053] Then, raise the temperature to 100-170°C, and dehydrate under normal pressure for 4-6 hours. Subsequently, the temperature is raised to 170-240° C., the nitrogen gas is turned off, and the reaction is carried out for 6-10 hours, and the obtained polyester polyol is subjected to vacuum dehydration until the acid value of the polyester polyol is less than or equal to 2.0 mgKOH / g.

[0054] Finally, the obtained polyester polyol was cooled to 150° C., filtered with diatomaceous earth to obtain a product with good transparency, and entered into a product tank.

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Abstract

The invention relates to a polyester polyol with improved low-temperature fluidity and a preparation method thereof. The method includes the following steps: mixing, by mass, 30-45 parts of a pure terephthalic acid (PTA) composition, 10-15 parts of alkyl dihydric alcohol or polyalcohol having a branched structure, 30-40 parts of dihydric alcohol and / or trihydric alcohol, and 0.5-1 part of a catalyst, heating up to 60-80 DEG C, and filling with nitrogen to break vacuum after vacuumizing; heating up to 100-170 DEG C, and performing dehydration for 4-6 hours; and heating up to 170-240 DEG C, performing a reaction for 6-10 hours, and obtaining the polyester polyol. The preparation method utilizes the alkyl dihydric alcohol or polyalcohol having the branched structure, so that the prepared polyester polyol has a hyperbranched structure, product compatibility is improved while low-temperature flow properties are good, and recycling and utilization of PTA residues are achieved.

Description

technical field [0001] This application relates to the technical field of polyester polyols. In particular, the present application relates to a polyester polyol with improved low-temperature fluidity and a method for preparing the same. Background technique [0002] Due to its excellent strength, elasticity, and wear resistance, polyurethane is widely used in various fields such as adhesives, foams, elastomers, and coatings. Among them, polyester polyol is one of the core raw materials for producing polyester polyurethane. Polyester polyols are usually formed by condensation (or transesterification) of dibasic / polycarboxylic acids (including acid anhydrides or esters) and dibasic / polyols, or polymerization of lactones and polyols. According to the difference of synthetic raw materials, polyester polyols can exhibit different excellent properties. [0003] At present, polyester polyols on the market have good fluidity at room temperature, but at lower ambient temperatures...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/183
CPCC08G63/183C08G63/78
Inventor 董绍华
Owner SHANGHAI LIANSHENG CHEM
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