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Polyester polyol, preparation method thereof and polyurethane hot melt adhesive and preparation method thereof

A polyurethane hot-melt adhesive, polyester polyol technology, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problem of unstable performance, poor bonding effect, poor heat aging performance, etc. problem, to achieve the effect of low production cost, simple operation and convenient large-scale production

Inactive Publication Date: 2019-01-22
SHANGHAI JINTANG PLASTIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most hot-melt polyurethane adhesive products have problems such as unstable performance, poor heat aging resistance, and poor bonding effect on materials such as polyester filament and polypropylene fiber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] The present invention provides the preparation method of polyester polyol described in above-mentioned technical scheme, comprises the following steps:

[0040] In a protective atmosphere, after mixing sebacic acid, C2-C12 dihydric alcohols and C4-C8 dibasic acids, effluent treatment is carried out to obtain effluent materials;

[0041] In a protective atmosphere, the first-stage polycondensation reaction is carried out after mixing the effluent material with a titanate catalyst to obtain the first-stage polycondensation material;

[0042] The first-stage polycondensation material is subjected to a second-stage polycondensation reaction under vacuum conditions to obtain polyester polyol.

[0043] The invention mixes sebacic acid, C2-C12 dibasic alcohols and C4-C8 dibasic acids in a protective atmosphere, and then performs effluent treatment to obtain effluent materials. In the present invention, there is no special limitation on the type of protective gas for providing t...

Embodiment 1

[0086] Put 1137kg sebacic acid, 2090kg 1,4-butanediol and 2273kg adipic acid into 6m 3 In the reaction kettle, heat up the temperature and feed in nitrogen. When the temperature of the material reaches 140 ° C, the water will start to flow out, and the water will be treated for 2 hours after heat preservation; Isopropyl ester, heat preservation reaction for 2 hours, control the top temperature of the reflux tower to not exceed 100°C throughout the whole process, and cool the reflux tower at a rate of 50°C / min. When the top temperature of the reflux tower drops to 40°C, stop nitrogen, and control the system temperature to 230°C, vacuumize for 2 hours at a vacuum of -0.05MPa, and then vacuumize for 4 hours at a vacuum of -0.096MPa. During the entire vacuuming process, control the top temperature of the reflux tower to not exceed 80°C. Take a sample and quickly test the acid value and hydroxyl value. The measured acid value of the sample is 0.45mgKOH / g, and the hydroxyl value is ...

Embodiment 2

[0094] Put 3170kg of sebacic acid, 5155kg of 1,6-hexanediol and 3170kg of adipic acid into the 12m 3 In the reaction kettle, heat up and feed in nitrogen. When the temperature of the material reaches 150 ° C, the water will start to flow out, and the water will be treated for 3 hours after heat preservation; Isopropyl ester, heat preservation reaction for 3 hours, control the top temperature of the reflux tower to not exceed 100°C throughout the whole process, and cool the reflux tower at a rate of 60°C / min. After the top temperature of the reflux tower drops to 40°C, stop nitrogen, and control the system temperature to 230°C, vacuumize at -0.09MPa vacuum for 1 hour, then vacuumize at -0.1MPa for 6 hours, and control the top temperature of the reflux tower not to exceed 80°C during the entire vacuuming process. Take a sample and quickly test the acid value and hydroxyl value. The measured acid value of the sample is 0.36mgKOH / g, and the hydroxyl value is 55.33mgKOH / g. Stop the...

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Abstract

The invention provides polyester polyol. The invention introduces sebacic acid during the preparation of the polyester polyol, which can improve the heat resistance and rigidity of the polyester polyol, the polyester polyol as a soft segment of the polyurethane hot melt adhesive can be greatly improve the heat aging resistance and bonding strength of the polyurethane hot melt adhesive; at the sametime, the use of mixed acid (ie, sebacic acid and C4-C8 dibasic acid) can reduce the crystallinity of the polyester polyol, which is beneficial to improve the wettability and strength of the polyurethane hot melt adhesive, and is in favor of improving processing properties of the polyurethane hot melt adhesive. In addition, the polyurethane hot melt adhesive prepared by using the polyester polyolprovided by the invention has the advantages of excellent water resistance, stable hot melt performance and wide adaptability of the bonding material, and has good bonding performance to polyester and polypropylene materials.

Description

technical field [0001] The invention relates to the technical field of hot-melt adhesives, in particular to a polyester polyol and a preparation method thereof, a polyurethane hot-melt adhesive and a preparation method thereof. Background technique [0002] With the increasing emphasis on fire safety in our country, the domestic demand for fire hose is increasing. The fire hose is mainly composed of braided layer, adhesive layer and inner lining. The main function of the adhesive layer is to bond the outer layer. Braiding layer and inner lining; the braiding layer is usually woven or mixed with polyester filament, polypropylene fiber, cotton yarn and other materials; the inner lining is usually rubber and plastic (composition includes PVC, plasticizer and hard calcium carbonate, etc.) or Injection-molded TPU. The quality of the adhesive has an important influence on the performance of the fire hose. The commonly used adhesives mainly include rubber, polyurethane, acrylic re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/16C08G63/85C08G18/42C08G18/10C08G18/32C09J175/06
CPCC08G18/10C08G18/4238C08G63/16C08G63/85C09J175/06C08G18/3206
Inventor 詹中贤牛杰峰
Owner SHANGHAI JINTANG PLASTIC TECH CO LTD
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