Polyester polyol with low hydroxyl value as well as preparation method thereof

A technology of polyester polyol and low hydroxyl value, applied in the field of polyester polyol, can solve the problems of unfavorable stability of product quality consistency, unfavorable environmental protection, low strength and cohesiveness of polyurethane adhesive, etc. Good quality consistency and good adhesion

Inactive Publication Date: 2018-10-09
SHANGHAI LIANSHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, on the one hand, in the production process, the fatty acid itself with a wider molecular weight distribution and / or the small molecules generated by it and polyols are not conducive to the stability of the formation and the consistency of product quality, and the obtained multi-component polyester multi-component The strength and cohesiveness of the polyurethane adhesive prepared with alcohol as the reactant are not high
On the other hand, an entrainer needs to be added during the preparation process, and the generated water and small molecule reactants / products are evaporated together, resulting in a large amount of harmful waste, which is not conducive to environmental protection

Method used

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Embodiment

[0045] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. All reagents and raw materials used were purchased commercially unless otherwise specified.

[0046] Example

[0047] This embodiment relates to the method for synthesizing polyester polyol.

[0048] First, add 950-1000kg of phthalic anhydride, 850-900kg of diethylene glycol, and 5kg of tetrabutyl titanate into the reaction kettle (please confirm the catalyst and the amount added). Nitrogen gas flowed, stirred, and reacted at a temperature of 100-170° C. for 5 hours.

[0049] Then, gradually raise the temperature to 170-240°C, keep it at 230-240°C for 6 hours, and increase the flow of nitrogen gas during this period, and then carry out segmental vacuuming, so that the vacuum degree of the device is reduced to 0~-0.09MPa, and the reaction 3- 4 hours until the acid value is less than or equal to 5.0mgKOH / g. A...

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Abstract

The invention relates to polyester polyol with low hydroxyl value as well as a preparation method thereof. The method comprises the following steps: mixing aromatic binary carboxylic acid or anhydride, diol and a catalyst in an inert atmosphere and under a stirring condition, and reacting at the temperature of 100 to 170 DEG C for 4 to 6 hours; heating to 170 to 240 DEG C, continuously introducinginert gas and reacting for 5 to 7 hours; and closing the inert gas, sectionally vacuumizing to negative pressure and reacting for 3 to 4 hours until the product reaches to a preset acid value to obtain the polyester polyol. By the method, the polyester polyol with low hydroxyl value is prepared from single component diol and aromatic binary carboxylic acid or anhydride. Continuous production is facilitated, and the obtained product has high quality consistency. Fatty acid is not used and an azeotrope agent does not need to be added in the preparation process, volatile byproducts generated bythe reaction are few, and environmental protection is benefited.

Description

technical field [0001] This application relates to the technical field of polyester polyols. Specifically, the application relates to a low hydroxyl value polyester polyol and a preparation method thereof. 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, the synthesis of polyester polyols mainly adopts batch method. The raw material polyols and various polybasic acids, including fatty acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C09J175/06C08G18/42
CPCC08G18/425C08G63/672C08G63/78C09J175/06
Inventor 董绍华
Owner SHANGHAI LIANSHENG CHEM
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