High-functionality degree polyester polyol and preparation method thereof

A polyester polyol, high-functionality technology, used in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, plastic recycling, etc., can solve the problem of single catalyst, decreased thermal stability of foam, polyester The problem of high viscosity of polyols can improve the damage effect, reduce the viscosity of the product, and expand the molecular distance.

Active Publication Date: 2015-01-07
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The catalyst used in the alcoholysis reaction is single and the amount is relatively large (the amount added is greater than 0.2% of the total material amount of the alcoholysis reaction), which will cause adverse effects on subsequent reactions and downstream applications: on the one hand, the alcoholysis catalyst has a very strong The catalytic effect of transesterification can easily increase the polycondensation degree of subsequent reactions, resulting in excessive viscosity of polyester polyols and thus affecting the use of products. On the other hand, alcoholysis catalysts can easily accelerate the decomposition of polyurethane foam at high temperatures (the mechanism is similar to alcoholysis), As a result, the thermal stability of the foam is reduced, which affects its flame retardancy;
[0004] (2) Polyester polyol is easy to crystallize: whether it is ethylene terephthalate or diethylene glycol terephthalate, its molecular structure has a high degree of symmetry, so polyester (polyester) Waste) polyols produced by alcoholysis solution are very easy to crystallize at normal temperature, generally speaking, aromatic hydrocarbon polyester polyols (especially terephthalic acid type) and physical foaming agents such as cyclopentane have poor Miscibility, and the crystallization of polyester polyols will aggravate the above effects, and even the stratification of white materials will occur, which will make the inspiration performance of the foam worse, and finally affect the cell structure and density uniformity of the foam. In the method for producing polyester polyol by decomposing polyester (polyester waste), there is a lack of effective ways to inhibit the crystallization of polyester polyol;
[0005] (3) Polyester polyols generally have defects in functionality: a. Due to too low functionality (average functionality 2.0-2.2), it is easy to cause a decrease in the dimensional stability of polyurethane foam; b. Although the functionality is high (average functionality degree 2.4~2.5), but the viscosity is relatively high (25℃, 20000~30000mPa·S), which is easy to reduce the fluidity of polyester polyol during foaming and affect its foaming effect

Method used

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  • High-functionality degree polyester polyol and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0045] Put 1000kg of polyester chips (η=0.85dl / g), 1000kg of diethylene glycol, 0.8kg of zinc acetate, and 0.8kg of n-butyl titanate into reactor A, blow in nitrogen, stir and raise the temperature to 235°C, and keep the temperature constant Stir for 20 minutes to completely dissolve the polyester chips, then slowly raise the temperature to 240°C, and carry out the alcoholysis reaction at a constant temperature for 6 hours under the protection of nitrogen. When the amount of ethylene glycol removed by the distillation column of reactor A reaches 48 kg and the After the viscosity of the product reaches 1100-1200mPa·S at 25°C, the reaction is stopped, the temperature is lowered to 160°C, and impurities are filtered with diatomaceous earth to obtain the polyester alcoholysis solution.

Embodiment 1-2

[0047] Put 1000kg of recovered PET film powder (η=0.73dl / g), 1000kg of diethylene glycol, 0.6kg of zinc acetate, and 0.6kg of n-butyl titanate into reactor A, blow in nitrogen, stir and heat up to 240°C , stirred at constant temperature for 20 minutes to completely dissolve the recovered PET film, then slowly raised the temperature to 240°C, and carried out alcoholysis reaction at constant temperature for 8 hours under the protection of nitrogen, when the amount of ethylene glycol removed by the rectifying column of reactor A reached 50kg After the viscosity of the reactant reaches 1100-1200 mPa·S at 25°C, the temperature is lowered to 160°C, and impurities are filtered through diatomaceous earth to obtain the polyester alcoholysis solution.

Embodiment 1-3

[0049] Put 1000kg of recovered polyester chips (η=0.55dl / g), 1000kg of glycerin, 0.7kg of zinc acetate, and 0.6kg of n-butyl titanate into reactor A, blow in nitrogen, stir and raise the temperature to 235°C, and stir at a constant temperature 20 minutes to completely dissolve the recycled polyester chips, then slowly raise the temperature to 245°C, and carry out the alcoholysis reaction at a constant temperature for 7 hours under the protection of nitrogen. After the viscosity of the product reaches 1100-1200mPa·S at 25°C, the temperature is lowered to 160°C, and impurities are filtered with diatomaceous earth to obtain the polyester alcoholysis solution.

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Abstract

The invention discloses high-functionality degree polyester polyol and a preparation method thereof. The high-functionality degree polyester polyol comprises the following components in parts by mass: 900-1200 parts of polyester alcoholysis liquid, 900 parts of phthalic anhydride, 400-600 parts of aliphatic dibasic acid, 800-1000 parts of dihydric alcohol, 550-900 parts of polyhydric alcohols, 0.3-0.5 part of esterification catalyst. The preparation method comprises the following steps: carrying out an esterification reaction, removing the moisture, performing condensation polymerization, thereby obtaining the product. According to the high-functionality degree polyester polyol, the average functionality degree is 2.4-2.5, the viscosity is less than or equal to 10000mPa.S at the temperature of 25 DEG C, the hydroxyl value is 300-350mgKOH/g, the acid value is less than or equal to 1mgKOH/g, and the polyester polyol is non-crystallizable after being stored for three months under the condition of 2 DEG C. The polyester polyol disclosed by the invention can be widely applied to the fields of rigid polyurethane foam plates, polyurethane elastomers and polyurethane adhesives.

Description

technical field [0001] The invention belongs to organic polymer compounds and their preparation, and relates to a high-functionality polyester polyol and a preparation method thereof. The high-functionality polyester polyol prepared by using polyester (polyester waste) in the invention is suitable for the fields of polyurethane hard foam boards, polyurethane elastomers, polyurethane adhesives, and the like. Background technique [0002] Polyester polyols are widely used in polyurethane rigid foam sheets, polyurethane elastomers, and polyurethane adhesives. The classic production method is the condensation of dibasic acids (anhydrides) and diols (polyols). As polyethylene terephthalate (PET for short) is widely used to prepare fabrics, beverage bottles and packaging materials, a large amount of PET waste is produced. In recent years, these PET wastes have been used as raw materials to produce polyester poly Alcohol, to make full use of all available resources to reduce its e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/66C08G63/20C08G63/181C08G18/42C08J11/24B01J31/04
CPCY02W30/62
Inventor 罗金安陈维敏黄杰梁倩倩
Owner SICHUAN DONGFANG INSULATING MATERIAL
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