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Polyurethane adhesive for composite fluoroplastic film and preparation method thereof

A polyurethane adhesive and plastic film technology, applied in the direction of adhesives, grafted polymer adhesives, adhesive types, etc., can solve the problem of poor bending resistance, low bonding strength, and failure to meet the requirements of fluoroplastic films and flexible materials Composite requirements and other issues, to improve compatibility, improve bonding strength, to meet the effect of solvent resistance

Active Publication Date: 2016-07-06
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If this type of adhesive is used for lamination of fluoroplastic film with other resins (such as polyurethane resin, ethylene-vinyl alcohol copolymer, polyester resin, nylon, etc.) However, it cannot meet the requirements of compounding fluoroplastic film and flexible material due to the disadvantages of poor resistance, friction resistance and bending resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The preparation method of described acrylic acid modified polyurethane prepolymer is:

[0032] Polycarbonate diol and isophorone diisocyanate are mixed and reacted, and then matured to obtain a polyurethane prepolymer;

[0033] reacting the polyurethane prepolymer with an acrylic monomer in an organic solvent under the action of an initiator to obtain an acrylic modified polyurethane prepolymer;

[0034] The curing agent is an adduct of polyisocyanate and polyol or a trimer of polyisocyanate;

[0035] The catalyst is an organometallic catalyst or a tertiary amine catalyst.

[0036] The polyurethane adhesive of the present invention includes three raw materials of acrylic modified polyurethane prepolymer, curing agent and catalyst.

[0037] The preparation method of the polyurethane prepolymer of described acrylic acid modification is:

[0038] Polycarbonate diol and isophorone diisocyanate are mixed and reacted, and then matured to obtain a polyurethane prepolymer; ...

Embodiment 1

[0059] Add 100 parts of polycarbonate diol with a molecular weight of 2000 into the reaction kettle and raise the temperature to 90±5°C. After the sample is melted, stir under nitrogen protection. During the stirring process, add 10 parts of isophorone diisocyanate. After the sample was reacted for 6 hours, it was poured into a container, put into a 100°C oven for aging for 8 hours, and cooled to room temperature to obtain a polyurethane prepolymer.

[0060] Add 10 parts of polyurethane prepolymer into 30 parts of ethyl acetate, and stir slowly at 80°C. After the polyurethane prepolymer is completely dissolved, under the protection of nitrogen, add 1 part of methyl methacrylate and 1 part of A mixed solution of butyl acrylate and 0.04 parts of benzoyl peroxide was reacted for 8 hours to obtain an acrylic modified polyurethane prepolymer.

[0061] Add 100 parts of the acrylic modified polyurethane prepolymer prepared above, add 3 parts of isophorone diisocyanate trimer, 0.2 par...

Embodiment 2

[0063] Acrylic modified polyurethane was prepared by the same process as in Example 1.

[0064] Add 100 parts of the prepared acrylic modified polyurethane prepolymer, 3 parts of toluene diisocyanate trimer and 0.4 part of triethanolamine, stir slowly to mix evenly, and then prepare the polyurethane adhesive for composite fluoroplastic film. This adhesive is used for composite PVDF / TPU film, and its peel strength after curing is 6.5N / cm

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Abstract

The invention provides a polyurethane adhesive used for a composite fluoroplastic film. The polyurethane adhesive is formed by compounding of 100 parts by weight of acrylic acid modified polyurethane prepolymer, 2-5 parts by weight of a curing agent and 0.1-0.5 part by weight of a catalyst. The preparation method of the polyurethane adhesive includes: mixing polycarbonate diol with isophorone diisocyanate to undergo reaction, then conducting curing to obtain a polyurethane prepolymer; subjecting the polyurethane prepolymer and an acrylic monomer to reaction in an organic solvent under the action of an initiator, thus obtaining the acrylic acid modified polyurethane prepolymer; and adding the curing agent and the catalyst into the acrylic acid modified polyurethane prepolymer, and mixing them uniformly to obtain the polyurethane adhesive. Experimental results show that, when the polyurethane adhesive is used for bonding of a fluoroplastic film with other resin (like polyurethane resin, ethylene-vinyl alcohol copolymer, polyester resin, nylon and the like) films, textiles and other flexible materials, the peel strength is higher than 6N / cm.

Description

technical field [0001] The invention relates to the field of adhesives, in particular to a polyurethane adhesive used for compounding fluoroplastic films and a preparation method thereof. Background technique [0002] Fluoroplastics are alkane polymers in which part or all of the hydrogen is replaced by fluorine. Because they contain a large number of high-energy C-F bonds, they have excellent properties in terms of chemical stability, weather resistance, high and low temperature resistance, and electrical insulation. They are widely used It is used in many fields of industry and civil use. In particular, fluoroplastic films are often combined with other flexible materials to prepare high-performance composite materials. Although fluoroplastic film has many advantages, it is recognized as one of the difficult-to-adhesive materials due to its symmetrical structure, low surface energy, difficulty in diffusion between interfaces, and difficulty in bonding with other materials....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J151/08C09J175/06C09J11/06C08F283/00C08F220/14C08F220/18C08F220/28C08F220/06C08F220/32C08G18/44
Inventor 熊征蓉杨宇明郭晓明王军盛德鲲孙磊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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