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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 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 the reaction vessel, the reaction temperature is raised to 110 degrees, and the pressure Dehydrate for 2h at <1.3KPa, control the water content below 0.1%, then lower the temperature to below 70 degrees, add 252 parts of diphenylmethane diisocyanate (MDI), react at 85 degrees for 2.5h, filter and discharge the material to obtain A Components.

Example Embodiment

[0029] Example 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 the reaction vessel. The temperature is raised to 60 degrees, and 0.2 parts of azobisisobutyronitrile, 15 parts of butyl acrylate, 5 parts are added dropwise. The mixed solution of methyl methacrylate was added dropwise within 2h, kept for 1.5h, and the reaction temperature was raised to 110 degrees. Dehydrate for 2h at <1.3KPa, control the water content below 0.1%, then lower the temperature to below 70 degrees, add 252 parts of diphenylmethane diisocyanate (MDI), react at 85 degrees for 2.5h, filter and discharge the material to obtain A Components.

Example Embodiment

[0032] Example 3:

[0033] Synthesis of A-2

[0034] Put 50 parts of polyoxypropylene glycol with a molecular weight of 1000 and 100 parts of castor oil into a reaction vessel. The temperature is raised to 900 degrees Celsius, and 0.2 parts of benzoyl peroxide, 10 parts of butyl acrylate, and 5 parts of methyl alcohol are added dropwise. The mixed solution of methyl acrylate and 5 parts of hydroxyethyl acrylate, dripped in 2h, keep for 1.5h, raise the reaction temperature to 110 degrees, under pressure Dehydrate for 2h at <1.3KPa, control the water content below 0.1%, then lower the temperature to below 70 degrees, add 252 parts of diphenylmethane diisocyanate (MDI), react at 85 degrees for 2.5h, filter and discharge the material to obtain A Components.

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PUM

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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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