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Solvent-free polyurethane adhesive with high initial viscosity and preparation method thereof

A solvent-free polyurethane and adhesive technology, used in polymer adhesive additives, adhesive additives and other directions, can solve the problems of small viscosity, low viscosity, quality accidents, etc., to improve the curing speed, popularize the scope of use, expand The effect of using the range

Inactive Publication Date: 2015-12-23
湖州倍格曼新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, because the solvent-free process determines that the solvent-free composite adhesive must have a small viscosity, otherwise the fluidity in the production process and the operability of the machine coating are poor, which is easy to cause quality accidents, so the non-solvent on the market Solvent products are generally characterized by low viscosity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Synthesis of A-0

[0028] Put 50 parts of polyoxypropylene glycol with a molecular weight of 1000 and 100 parts of castor oil into a reaction vessel, raise the reaction temperature to 110 degrees, dehydrate for 2 hours at a pressure<1.3KPa, and control the water content below 0.1%. After cooling down to below 70 degrees, add 252 parts of diphenylmethane diisocyanate (MDI), react at 85 degrees for 2.5 hours, and filter out the material to obtain component A.

Embodiment 2

[0030] Synthesis of A-1

[0031] Put 50 parts of polyoxypropylene glycol with a molecular weight of 1000 and 100 parts of castor oil into a reaction vessel, heat up to 60 degrees, dropwise add 0.2 parts of azobisisobutyronitrile, 15 parts of butyl acrylate, 5 parts of Add the mixed solution of methyl methacrylate dropwise within 2 hours, keep warm for 1.5 hours, raise the reaction temperature to 110 degrees, dehydrate for 2 hours under the pressure <1.3KPa, control the water content below 0.1%, and then cool down to 70 Below the temperature, add 252 parts of diphenylmethane diisocyanate (MDI), react at 85 degrees for 2.5 hours, and filter out the material to obtain component A.

Embodiment 3

[0033] Synthesis of A-2

[0034] 50 parts of polyoxypropylene glycol with a molecular weight of 1000 and 100 parts of castor oil are put into a reaction vessel, the temperature is raised to 900 degrees, and 0.2 parts of benzoyl peroxide, 10 parts of butyl acrylate, and 5 parts of formaldehyde are added dropwise. The mixed solution of methyl acrylate and 5 parts of hydroxyethyl acrylate was added dropwise within 2 hours, kept warm for 1.5 hours, raised the reaction temperature to 110 degrees, dehydrated for 2 hours under pressure <1.3KPa, and controlled the water content at 0.1% After lowering the temperature to below 70 degrees, add 252 parts of diphenylmethane diisocyanate (MDI), react at 85 degrees for 2.5 hours, and filter out the material to obtain component A.

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Abstract

The invention discloses a solvent-free bi-component polyurethane adhesive with high initial viscosity. The adhesive comprises a component A and a component B, wherein the component A is a blocked isocyanate group compound, the component B is a polyhydroxy compound, and the component A and the component B are mixed according to the molar ratio of NCO:OH of 1.1-1.5 so as to obtain the solvent-free polyurethane adhesive with high initial viscosity. The component A, namely the blocked isocyanate group compound, is formed by reaction of polyisocyanate and the polyhydroxy compound. The component B, namely the polyhydroxy compound, is composed of polyether polyol, or composed of polyether polyol and vegetable oil polyol, or composed of polyether polyol, vegetable oil polyol and tackifying resin. The viscosity of the solvent-free compound adhesive is reduced, and certain initial viscosity can be ensured. Particularly, good initial viscosity can be achieved by only applying a thin adhesive layer.

Description

technical field [0001] The invention relates to a solvent-free polyurethane composite adhesive suitable for the field of composite flexible packaging, in particular to a solvent-free polyurethane adhesive with high initial tack and a preparation method thereof. Background technique [0002] After years of development, solvent-based polyurethane composite adhesives have been widely used in the packaging industry. However, due to the use of a large amount of organic solvents, there is great damage to the environment, and it has the disadvantages of being flammable, explosive, and smelly. Therefore, with the country's concern for environmental protection and people's concern for the safety of packaging, green and environmentally friendly solvent-free composite adhesives will become the trend of the packaging industry in the future. [0003] At present, because the solvent-free process determines that the solvent-free composite adhesive must have a small viscosity, otherwise th...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/08C08G18/66C08G18/48C08G18/36C08G18/62C08F220/18C08F220/14C08F220/28C08F222/14
Inventor 杨勇
Owner 湖州倍格曼新材料股份有限公司
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