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Method for preparing polyhydric alcohol through waste polyester bottles

A polyester polyol, waste technology, applied in the field of polyester polyol, can solve the problem of not having flame retardancy, etc., and achieve the effect of stable physical and mechanical properties

Active Publication Date: 2016-01-13
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above technical solutions can be used to prepare low-cost polyester polyols, but the resulting products do not have flame retardant properties

Method used

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Examples

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Embodiment Construction

[0018] The present invention will be further described in conjunction with specific examples.

[0019] The invention relates to a method for preparing polyester polyol, in particular to a flame-retardant polyester polyol prepared from waste polyester bottles.

[0020] A kind of preparation method of polyester polyol is characterized in that comprising the following steps:

[0021] A) Depolymerization of waste PET: cutting the cleaned PET bottle into pieces, placing it in a glycol solution containing catalyst a, heating and pressurizing for depolymerization;

[0022] B) Esterification reaction: After the above depolymerization reaction is completed, add phthalic anhydride and catalyst b, heat the depolymerization product and the diol added in step A to carry out esterification reaction, and continuously remove it under a negative pressure of 0.1MPa Small molecule alcohol and water produced by the reaction;

[0023] C) adjusting the acid value: after the above reaction is comp...

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PUM

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Abstract

The invention relates to a method for preparing polyester polyol through waste polyester bottles. The method includes the steps that after the waste polyester bottles are subjected to alcoholysis, flame-retardant phthalic anhydride is introduced to be esterified with alcoholysate; after small molecular alcohol and water are removed, polyether-tribasic alcohol with the PH value ranging from 8 to 11 is added to be further subjected to esterification and condensation, the acid value of the obtained polyester polyol is adjusted, and thus the polyester polyol which is low in cost and excellent in flame retardant property and physical and mechanical property is prepared. The synthetic product can be used for producing polyurethane foam plates for building heat insulation.

Description

technical field [0001] The invention relates to the field of chemical synthesis of macromolecules, in particular to a polyester polyol synthesized from waste polyester bottles and used for preparing flame-retardant rigid polyurethane foam materials. Background technique [0002] Polyurethane foam materials are widely used in external insulation of building exterior walls due to their excellent energy-saving effects. However, in recent years, large-scale building fires have occurred frequently, and flammable polyurethane insulation materials have been pushed to the forefront. Since 2011, the country has successively issued strict fire protection policies and issued relevant standards, strictly prohibiting the use of flammable and combustible insulation materials. However, after the introduction of relevant policies and regulations, building fires have not been effectively contained, but have intensified. To get to the bottom of it, the price of flame-retardant polyurethane in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/682C08G18/42C08G101/00
Inventor 朱宁王万金董全霄樊勇贺奎夏义兵吴敬朋
Owner BEIJING ACAD OF BUILDING ENG
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