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Polyester polyol for polyurethane adhesive, preparation method thereof and polyurethane adhesive

A technology of polyurethane adhesives and polyester polyols, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve problems such as low production capacity

Pending Publication Date: 2020-06-05
HUZHOU OCHEM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most convenient method is to replace aromatic polyisocyanate with aliphatic polyisocyanate, but the production capacity of aliphatic polyisocyanate is much lower than that of aromatic polyisocyanate, and the price is 5-6 times that of the latter, so it can only be used in a small number of high-demand scenarios

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Methylpropanediol (0.3mol), neopentyl glycol (0.7mol), ethylene glycol (0.2mol), maleic anhydride (0.5mol), adipic acid (0.3mol) and isophthalic acid (0.2mol) , according to alcohol / acid molar ratio of 1.2:1, add 20ppm antioxidant 1010 and 10ppm triphenyl phosphite, under nitrogen protection, carry out esterification reaction at 150℃~230℃, when the acid value of the product is 8.2mgKOH / g, at 200°C to 245°C, gradually increase the vacuum degree, and carry out polycondensation reaction. When the hydroxyl value and acid value of the product reach the theoretical design value, the polycondensation is stopped, and the measured hydroxyl value is 113mgKOH / g, and the acid value is 1.01mgKOH. / g of the polyester polyol that effectively reduces the potential safety hazard of aromatic amines, the measured unsaturation of the polyester polyol is 2.01mmol / g, and the measured molecular weight is 993g / mol (number average molecular weight).

[0027] The above polyester polyols are rea...

Embodiment 2

[0029]Add butanediol (0.3mol), diethylene glycol (0.8mol), ethylene glycol (0.4mol), fumaric acid (0.7mol) and adipic acid (0.3mol) in an alcohol / acid molar ratio of 1.5:1 , add 20ppm antioxidant 1024 and 10ppm antioxidant 168, under nitrogen protection, carry out esterification reaction at 150℃~230℃, when the acid value of the product is 9.2mgKOH / g, at 200℃~245℃, and gradually increase When the hydroxyl value and acid value of the product reach the theoretical design value, the polycondensation is stopped, and the measured hydroxyl value is 172mgKOH / g, and the acid value is 1.31mgKOH / g, which can effectively reduce the safety hazard of aromatic amines. The ester polyol has a measured unsaturation degree of 3.06 mmol / g and a measured molecular weight of 650 g / mol (number average molecular weight).

[0030] The above polyester polyols are reacted with polyisocyanates (TDI) to produce polyisocyanate terminated polyurethane adhesives.

Embodiment 3

[0032] Dipropylene glycol (0.2mol), diethylene glycol (0.8mol), ethylene glycol (0.1mol), maleic acid (0.1mol), terephthalic acid (0.2mol) and adipic acid (0.7mol), According to the alcohol / acid molar ratio of 1.1:1, add 20ppm zinc isooctanoate, 10ppm antioxidant 1330 and 10ppm diphenylisodecyl phosphite, under the protection of nitrogen, carry out esterification reaction at 150℃~230℃, when the product When the acid value is 10mgKOH / g, at 200℃~245℃, and gradually increase the vacuum degree, carry out polycondensation reaction, when the hydroxyl value and acid value of the product reach the theoretical design value, stop the polycondensation, and the measured hydroxyl value is 25mgKOH / g A polyester polyol with an acid value of 0.56 mgKOH / g that can effectively reduce the safety hazard of aromatic amines, a measured unsaturation of 0.45 mmol / g, and a measured molecular weight of 4480 g / mol (number average molecular weight).

[0033] The above polyester polyol was reacted with a ...

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Abstract

The invention provides polyester polyol for a polyurethane adhesive, a preparation method of the polyester polyol and the polyurethane adhesive. According to the technical scheme, the content of freeamine in the polyurethane adhesive can be effectively reduced, and the safety of the polyurethane adhesive is improved.

Description

technical field [0001] The invention belongs to the field of polyurethane adhesives, in particular to a polyurethane adhesive capable of effectively reducing free amines and a preparation method thereof. Background technique [0002] In the field of polyurethane synthesis, polyester polyol is an important raw material component, and polyurethane is synthesized through the reaction of polyester polyol and polyisocyanate. Polyurethane is widely used, especially in food and pharmaceutical flexible packaging, where polyurethane adhesives occupy a dominant position. [0003] With the popularization of the concept of environmental protection and the needs of the industry's own development, polyurethane adhesives for flexible packaging are developing towards high solid content, high performance and solvent-free. In order to meet the strength requirements of various types of flexible packaging composite structures, there are often excess polyisocyanates in polyurethane adhesives. W...

Claims

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Application Information

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IPC IPC(8): C08G63/52C08G63/78C08G18/68C09J175/14
CPCC08G63/52C08G63/78C08G18/68C09J175/14
Inventor 胡阮冰宁超峰
Owner HUZHOU OCHEM CHEM
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