Boiling resistant polyurethane adhesive and method for preparing same

A polyurethane adhesive and cooking-resistant technology, which is applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problem of not considering the deep freezing resistance of adhesives, poor low temperature performance, and failure to meet application requirements, etc. Problems, to achieve the effect of excellent resistance to chemical media, high adhesive strength, and excellent low temperature resistance

Inactive Publication Date: 2005-06-22
广东国望精细化学品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patents do not involve the molecular design technology based on polyether ester, nor do they take into account the deep freezing resistance of the adhesive. Therefore, when the patents are applied to deep freezing food packaging, they still have the defect of poor low temperature performance, which cannot meet people's needs. application requirements

Method used

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  • Boiling resistant polyurethane adhesive and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Put 166g of isophthalic acid, 202g of sebacic acid, 225g of 2-methylpropanediol, 26.8g of trimethylolpropane and 100ppm of catalyst stannous chloride into a 1000ml three-necked flask reactor, under nitrogen protection at 160-220 °C to react until the hydroxyl value of the system is less than 10mgKOH / g, and then gradually reduce the pressure at 220-240°C to continue the reaction to obtain a polyester polyol product with a hydroxyl value of 80mgKOH / g. Ethyl acetate was added to dissolve to 49% solids and labeled "B1".

Embodiment 2

[0036] Put 522.6g of toluene diisocyanate (TDI) and 219g of ethyl acetate into a three-neck flask reactor, control the temperature of the reactant between 60-80°C, add 134g of molten trimethylolpropane (TMP) dropwise, and add dropwise The reaction was continued for 4.5 hours after completion to obtain a curing agent for polyurethane dry composite adhesive with an isocyanate group content of 14.4% and a solid content of 75%, which was labeled as "curing agent 1".

Embodiment 3

[0038] Put 83g of terephthalic acid, 166g of isophthalic acid, 124g of ethylene glycol, 156g of neopentyl glycol and 100ppm of catalyst stannous chloride into a 1000ml three-neck flask reactor, and react at 160-220°C under nitrogen protection until water yield After reaching 54g, add 202g of sebacic acid and 200g of polytetrahydrofuran with a relative molecular weight of 1000, continue the reaction at 200-230°C until the water is exhausted, and then gradually reduce the pressure at 200-230°C for 4 hours, and finally at 1-2mmHg The reaction was continued for 4 hours at 230-250° C. in a vacuum, the reaction was stopped, and the temperature of the reaction system was lowered. The hydroxyl value of the obtained polyether ester diol product was 11.2 mgKOH / g. Ethyl acetate was added to dissolve to 49% solids, labeled "A1".

[0039] Add 3 parts of A1 and 1 part of B1, and add 1% by mass of KH-560 coupling agent and mix thoroughly to obtain the main component of polyurethane adhesive,...

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Abstract

The invention discloses a boiling resistant polyurethane adhesive and method for preparing same, wherein the adhesive comprises by weight ratio 50-90% of main component and 10-50% of curing agent, the main component comprises (A) polyether polyol with hydroxyl value being 10-30mgKOH/g and (B) polyester polyol with hydroxyl value being 30-100mgKOH/g, the curing agent is polyisocyanate prepolymer. The adhesive can be applied for an intaglio gluing dry-type compounding machine.

Description

technical field [0001] The invention relates to a cooking-resistant polyurethane adhesive. Specifically relate to a kind of linear or low branched polyether ester polyol (hydroxyl value 5-30mgKOH / g) by (A) low or medium relative molecular mass, (B) highly branched polyester polyol of low relative molecular mass (hydroxyl value 30-100mgKOH / g) and (C) polyurethane adhesive composed of polyisocyanate prepolymer. Background technique [0002] In recent years, with the continuous improvement of people's living standards, the packaging requirements for various foods are also increasing. In order to improve the hygiene and shelf life of food, composite films containing two or more layers of different films with more comprehensive physical and chemical properties are widely used. For ready-to-eat fish and cooked meat in bags, the packaging requirements are higher. Usually, a composite structure with high barrier properties to oxygen and moisture is used, and a certain period of hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08
Inventor 邓德纯陈大俊
Owner 广东国望精细化学品有限公司
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