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Composition for assisting in improving moisture permeability of polyurethane and polyurethane hot melt adhesive containing composition

A polyurethane hot melt adhesive and moisture permeability technology, applied in the field of polyurethane hot melt adhesives, can solve the problems of low moisture permeability of polyurethane hot melt adhesives, and achieve the effects of improving peel strength, accelerating PUR curing, and high reactivity

Active Publication Date: 2020-08-14
上海抚佳精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved in the present invention is to overcome the defect that the polyurethane hot melt adhesive moisture permeability is low when overcoming the pursuit of higher peel strength in the prior art, Thereby provide a kind of polyurethane hot melt adhesive and preparation method thereof

Method used

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  • Composition for assisting in improving moisture permeability of polyurethane and polyurethane hot melt adhesive containing composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This example provides a composition to help improve the moisture permeability of polyurethane, including 8g of polyoxypropylene diol with a number average molecular weight of 1000, 32g of polyoxypropylene diol with a number average molecular weight of 2000, a mass ratio of EO to PO of 3:1, and EO end capping 40% polyether polyol, 20 g polyneopentyl phthalate diol and 10 g poly-3-methyl-1,5-pentanediol adipate diol.

[0049] Wherein, the polyether polyol of the present embodiment is made by the following method: (1) 530.6g starter diethylene glycol and 50g catalyst potassium hydroxide are added in the normal-pressure stainless steel reactor and stirred and melted, and the melting temperature 80°C, then vacuum decompression, dehydration at 115°C, 1330Pa for 2 hours, stop dehydration when the water content reaches 0.3%, and obtain a potassium alkoxide solution. (2) Introduce nitrogen into the stainless steel reactor to replace the oxygen contained in it, so that the oxygen...

Embodiment 2

[0054] This example provides a composition that assists in improving the moisture permeability of polyurethane, including 8 g of polyoxypropylene diol with a number average molecular weight of 1000, 32 g of polyoxypropylene diol with a number average molecular weight of 2000, a mass ratio of EO to PO of 5:1, and EO-capped 55% polyether polyol, 20 g polyneopentyl phthalate diol and 10 g poly-3-methyl-1,5-pentanediol adipate diol.

[0055] Wherein, the polyether polyol of the present embodiment is made by the following method: (1) 530.6g starter diethylene glycol and 50g catalyst potassium hydroxide are added in the normal-pressure stainless steel reactor and stirred and melted, and the melting temperature 80°C, then vacuum decompression, dehydration at 115°C, 1330Pa for 2 hours, stop dehydration when the water content reaches 0.3%, and obtain a potassium alkoxide solution. (2) Pass nitrogen into the stainless steel reaction kettle to replace the oxygen contained in it, so that ...

Embodiment 3

[0060] This example provides a composition that assists in improving the moisture permeability of polyurethane, including 8 g of polyoxypropylene diol with a number average molecular weight of 1000, 32 g of polyoxypropylene diol with a number average molecular weight of 2000, a mass ratio of EO to PO of 9:1, and EO-capped 87% polyether polyol, 20 g polyneopentyl phthalate diol and 10 g poly-3-methyl-1,5-pentanediol adipate diol.

[0061] Wherein, the polyether polyol of the present embodiment is made by the following method: (1) 530.6g starter diethylene glycol and 50g catalyst potassium hydroxide are added in the normal-pressure stainless steel reactor and stirred and melted, and the melting temperature 80°C, then vacuum decompression, dehydration at 115°C, 1330Pa for 2 hours, stop dehydration when the water content reaches 0.3%, and obtain a potassium alkoxide solution. (2) Pass nitrogen into the stainless steel reaction kettle to replace the oxygen contained therein, so tha...

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Abstract

The invention relates to the technical field of high polymer materials, and particularly provides a composition for assisting in improving the moisture permeability of polyurethane and a polyurethanehot melt adhesive containing the composition. The composition comprises the following components in parts by weight: 25-50 parts of polyether polyol; 30-50 parts of polyester polyol; 5-8 parts of polypropylene oxide glycol, wherein the mass ratio of EO to PO of the polyether polyol is (9-3): 1; 1, the EO end capping rate is 40-90 percent; the number-average molecular weight is 2,000-4,000; the polyether polyol, polypropylene oxide glycol and polyester polyol are compounded according to a specific ratio to obtain the composition. Compared with the prior art, the polyurethane hot melt adhesive can play a synergistic role, has high reaction activity, accelerates PUR curing and significantly improves the peel strength of the polyurethane hot melt adhesive, and the obtained polyurethane hot melt adhesive contains a large number of hydrophilic groups, has high hydrophilicity and significantly improves the moisture permeability of the polyurethane hot melt adhesive.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a composition for assisting in improving the moisture permeability of polyurethane and a polyurethane hot-melt adhesive containing the same. Background technique [0002] Polyurethane hot melt adhesive (hereinafter referred to as PUR) is a type of polyurethane adhesive containing terminal -NCO groups. When it is used, when it is heated above the melting temperature, the thermoplastic segment (crystalline or amorphous, usually referred to as In the prepolymer, the polyether or polyester soft segment and the hard segment composed of isocyanate and chain extender) are randomly arranged, so that it has a certain fluidity and can be coated on the surface of the adhered material while it is hot. When the PUR cools below the melting point, the chain segments mentioned above begin to aggregate, causing the system to lose fluidity, thereby giving the moisture-curing hot melt adh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/42C08G18/66C08G18/54C08G18/32C09J175/04C09J5/00
CPCC08G18/4018C08G18/4804C08G18/4837C08G18/4202C08G18/4211C08G18/4238C08G18/66C08G18/542C08G18/4027C08G18/3834C09J175/04C09J5/00C09J2475/006C09J2400/263
Inventor 汪胜李玉博
Owner 上海抚佳精细化工有限公司
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