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Hot-melt polyurethane adhesive with high initial adhesion and preparation method thereof

A technology of hot-melt polyurethane and high initial viscosity, which is applied in the field of high initial viscosity hot-melt polyurethane adhesive and its preparation, which can solve the problems of inapplicable initial adhesive requirements and achieve the effect of high initial adhesive strength

Inactive Publication Date: 2017-03-15
佛山市顺德区巴德富实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned adhesives cannot be used in applications with high requirements for initial adhesion.

Method used

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  • Hot-melt polyurethane adhesive with high initial adhesion and preparation method thereof
  • Hot-melt polyurethane adhesive with high initial adhesion and preparation method thereof
  • Hot-melt polyurethane adhesive with high initial adhesion and preparation method thereof

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Embodiment Construction

[0044] The preparation method of the modified rosin acid active tackifier containing hydroxyl group is as follows: put the refined rosin or hydrogenated rosin in the market, glyceryl tert-carbonate Cardura EP10 (or other high-boiling compounds containing epoxy) in the reaction at a molar ratio of 1:1.05 Heating in the kettle to 2200C, dehydration reaction for about 20 hours until the acid acid is less than 0.5. Nitrogen protection was used during the reaction and a high vacuum was used for rapid dehydration. After the reaction is completed, the material is discharged in a molten state for use. The state of the product is a highly viscous liquid (or high Tg solid), and the active viscosifier in the example is the above-mentioned high viscous liquid viscosifier. The difference from the comparative patent is that the former uses a polymer active tackifier formed by free radical polymerization, with a molecular weight between 5000-32000; while the active tackifier in the present ...

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Abstract

The invention provides a hot-melt polyurethane adhesive with high initial adhesion. The hot-melt polyurethane adhesive comprises, by weight, 70 to 90% of polyurethane prepolymer and 10 to 30% of an adhesion promoting agent, wherein the adhesion promoting agent is prepared through addition of rosin acid, one-component or two-component epoxy, and hydrogenated rosin or any cyclic compound with a carboxyl group or natural resin. The invention has the following unique beneficial effects: 1, the active adhesion promoting agent is produced through addition of natural resin or a related cyclic compound with the carboxyl group and epoxy for the first time, and is applied to the reactive polyurethane adhesive; and 2, the novel two-step preparation method has not been reported and used so far. The novel two-step preparation method can prepare a hot-melt polyurethane adhesive product with high initial adhesion without changing a formula for the hot-melt polyurethane adhesive. The hot-melt polyurethane adhesive product has creep resistance reaching the grade of 3, 500 g, and has superior heat stability. Due to high adhesive capability and arbitrarily-adjustable hot opening time of the product, the hot-melt polyurethane adhesive product can be applied to industrial places like the shoemaking industry and engineered floors with high requirements on initial adhesion.

Description

technical field [0001] The invention relates to a high initial viscosity hot-melt polyurethane adhesive and a preparation method thereof, in particular to a very high initial viscosity hot-melt polyurethane adhesive for shoes. Background technique [0002] Invention patent ZL200410013331.5 uses reactive polyacrylate or other polymers synthesized from unsaturated monomers as raw materials to produce reactive moisture-curing hot-melt polyurethane adhesive products. The isocyanate group content of this hot-melt product 1-3%. In order to save costs and stabilize the final product, the invention adopts two measures: 1) The polyacrylic resin that produces the active tackifier has a hydroxyl value between 15.5-30 and a functionality between 2-6 , or produce epoxy-containing polyacrylic resin tackifiers with epoxy equivalents between 1500-7000, which are preferred to those between 1500-5000 and functionalities between 2-6. Adhesive; 2) Utilize the unique two-step reaction and the ...

Claims

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Application Information

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IPC IPC(8): C08G18/64C08G18/48C08G18/42C08G18/12C09J175/06C09J175/08
CPCC08G18/64C08G18/12C08G18/4018C08G18/4081C08G18/4202C08G18/4825C08G2170/20C09J175/06C09J175/08C08G18/40
Inventor 陈旨进罗宇熊峰
Owner 佛山市顺德区巴德富实业有限公司
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