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Preparation method of polyurethane adhesive for extrusion lamination

A polyurethane adhesive, extrusion compounding technology, applied in the direction of layered products, etc., can solve the problems of affecting appearance, yellowing, easy yellowing, etc., and achieve the effect of anti-yellowing, improved softening point, and improved peel strength

Inactive Publication Date: 2013-12-18
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Extrusion composite primers currently on the market are prone to yellowing when exposed to heat, light, etc., and yellowing will occur in market circulation, which will affect the appearance

Method used

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  • Preparation method of polyurethane adhesive for extrusion lamination
  • Preparation method of polyurethane adhesive for extrusion lamination
  • Preparation method of polyurethane adhesive for extrusion lamination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This example provides a method for preparing a polyurethane adhesive for extrusion compounding. The composite adhesive is a one-component anti-yellowing moisture-curing polyurethane adhesive, which is suitable for the traditional method of random polyethylene extrusion. Extrusion coating and extrusion compounding of polyethylene and aluminum foil, nylon, polyester, cellophane, etc., can also be used as a primer for PVDC emulsion.

[0027] The method comprises the steps of:

[0028] Add solvent, isophorone diisocyanate, benzoyl chloride, polyether diol with a weight average molecular weight of 2000, and polyether diol with a weight average molecular weight of 1000 into the reaction kettle and stir evenly. Add polyether triol and trimethylolpropane with a weight average molecular weight of 450 dropwise into the reaction system, and react at a certain temperature to form a prepolymer with NCO terminals;

[0029] Add 1,4-butanediol to the generated NCO-terminated prepolyme...

Embodiment 2

[0046] This example provides a method for preparing a polyurethane adhesive for extrusion compounding. The composite adhesive is a one-component anti-yellowing moisture-curing polyurethane adhesive, which is suitable for the traditional method of random polyethylene extrusion. Extrusion coating and extrusion compounding of polyethylene and aluminum foil, nylon, polyester, cellophane, etc., can also be used as a primer for PVDC emulsion.

[0047] The method comprises the steps of:

[0048] Add 700kg of ethyl acetate into the reaction kettle, start stirring, add 0.46kg of benzoyl chloride and 255.3kg of isophorone diisocyanate at 20-30°C, and then put in polyether diisocyanate with a weight average molecular weight of 2000 400kg of polyalcohol, 200kg of polyether glycol with a weight average molecular weight of 1000, add 230kg of ethyl acetate and stir, and form a uniformly stirred reaction system after stirring for 20 minutes, then add dropwise a polyether with a weight average...

Embodiment 3

[0050] This example provides a method for preparing a polyurethane adhesive for extrusion compounding. The composite adhesive is a one-component anti-yellowing moisture-curing polyurethane adhesive, which is suitable for the traditional method of random polyethylene extrusion. Extrusion coating and extrusion compounding of polyethylene and aluminum foil, nylon, polyester, cellophane, etc., can also be used as a primer for PVDC emulsion.

[0051] The method comprises the steps of:

[0052] Add 626kg of ethyl acetate into the reaction kettle, start stirring, add 0.42kg of benzoyl chloride and 229kg of isophorone diisocyanate at 20-30°C, and then put in polyether diisocyanate with a weight average molecular weight of 2000 Alcohol 350kg and weight-average molecular weight are 208kg of polyether diols with a weight average molecular weight of 1000, add 209kg of ethyl acetate and stir, and form a well-stirred reaction system after stirring for 20 minutes, then dropwise add weight-av...

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Abstract

The invention discloses a preparation method of a polyurethane adhesive for extrusion lamination, and belongs to the field of adhesive preparation. The method comprises the following steps that: a polyether polyol and polyisocyanate which have different molecular weights are reacted to generate an NCO-terminated prepolymer, and then a 1,4-butanediol chain extender is used to adjust the content of NCO of a product to generate a single-component polyurethane adhesive for extrusion lamination. In the method, by adding trifunctional polyether, the cross-linking occurs in the late reaction, thereby the peel strength of the polyurethane adhesive is improved; the addition of the trifunctional polyether allows the softening point of the adhesive to be increased, the adhesive does not easily adhere to rollers in actual use, and is used more conveniently. The polyurethane adhesive is an excellent-performance extrusion laminating adhesive, and is resistant to yellowing.

Description

technical field [0001] The invention relates to the field of adhesive preparation, in particular to a method for preparing a polyurethane adhesive for extrusion compounding. Background technique [0002] With the enhancement of people's awareness of environmental protection and the improvement of their own food safety awareness, green packaging has been mentioned in our daily life. my country also formulated the "General Guidelines for Green Food Packaging" in 2006, which uses paper packaging, Specific regulations have been put forward for metal packaging, plastic products, and outer packaging. The food packaging that everyone is paying more and more attention to is mainly composed of various plastic films, paper and metals compounded by various adhesives. Whether the materials in contact with food, such as plastics and adhesives, are toxic, and whether they are friendly to health, safety and the environment are the focus of people's attention. At present, the compounding m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/12C09J175/08B32B7/12
Inventor 张淑萍沈峰
Owner BEIJING COMENS NEW MATERIALS