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Polyurethane prepolymer, aquosity polyurethane binder and uses thereof

A polyurethane prepolymer, water-based polyurethane technology, applied in the application of water-based polyurethane adhesives in fields such as shoemaking, water-based polyurethane adhesives and their preparation fields, can solve the problem of low initial tack and adhesion of the adhesive. The problems of high manufacturing cost and high activation temperature of the agent can achieve the effects of excellent weather resistance, water resistance and solvent resistance, fast drying speed and low activation temperature.

Inactive Publication Date: 2008-05-07
北京林氏精化新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the ubiquitous problems of the polyurethane adhesives produced by these prior art are that the initial tack of the adhesive is low and the activation temperature is high, so it cannot fully satisfy the current market's pursuit, especially in the field of shoe adhesives. seek
[0016] When the prior art manufactures water-based polyurethane adhesives, there are problems such as high adhesive manufacturing cost and complicated manufacturing process, and the obtained water-based polyurethane adhesives are also very poor in terms of bond strength, initial tack and activation temperature. Difficult to meet the growing needs of practical applications

Method used

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  • Polyurethane prepolymer, aquosity polyurethane binder and uses thereof
  • Polyurethane prepolymer, aquosity polyurethane binder and uses thereof

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preparation example Construction

[0103] In the preparation method of the water-based polyurethane adhesive of the present invention, the reaction of the NCO group and water is suppressed by controlling the temperature when the chain extension reaction is carried out; Compared with water, the active H atom of the chain extender has a relatively higher reaction rate with the NCO group. Therefore, it is ensured that the prepolymer preferentially reacts with the chain extender, and reduces its reaction with water, thereby improving The problem of poor quality of the polyurethane adhesive prepared when the conventional method is used for chain extension is solved, and the cohesive strength of the obtained polyurethane adhesive is improved.

[0104] It can be seen from the above description that the water-based polyurethane adhesive of the present invention is actually an aqueous dispersion of the chain extension product of the polyurethane prepolymer of the present invention. Based on the total weight of the aqueo...

Embodiment 1

[0139] According to the formula in Table 1, polyethylene adipate diol (PEA manufactured by Bayer Company) was placed in a three-necked bottle, treated at -0.08MPa vacuum, 100°C for 3 hours, and cooled to 15°C , slowly add the polyisocyanate mixture under stirring, then add the catalyst, raise the temperature to 70°C, react for 4 hours, cool down to 35°C, add the NMP solution of DMPA, heat up to 70°C, react for 4 hours, cool down to 35°C, put Mix triethylamine and butanone, slowly add the mixture to the above reaction product for neutralization, react for 0.5 hours, quickly disperse the reaction product into deionized water mixed with ethylenediamine, and keep stirring at 0°C in the reaction system and react for 1 hour, and then distill and recover butanone under vacuum condition to obtain the water-based polyurethane adhesive.

[0140] The storage stability, activation temperature, initial tack and cohesive strength of the prepared water-based polyurethane adhesive were measur...

Embodiment 2

[0142] According to the formula in Table 1, polyoxypropylene glycol (PPG manufactured by Jinxi Chemical General Factory) was placed in a three-necked bottle, and was treated at -0.08MPa vacuum degree, 110°C temperature condition for 4 hours, cooled to 20°C, Slowly add polyisocyanate mixture under stirring state, then add catalyst, heat up to 68°C, react for 2 hours, cool down to 35°C, add DMBA acetone solution, heat up to 68°C, react for 5 hours, cool down to 35°C, and triethyl Mix the amine and butanone, slowly add the mixture to the above reaction product for neutralization, react for 0.5 hours, quickly disperse the reaction product in deionized water, stir for 1 hour, then add dropwise 1,4-butanediol, in The reaction system is stirred and reacted at 0° C. for 1 hour, and distilled to recover methyl ethyl ketone and acetone under vacuum conditions to obtain a water-based polyurethane adhesive.

[0143] The storage stability, activation temperature, initial tack and cohesive ...

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Abstract

The invention relates to a polyurethane prepolymer, which is characterized in that: the invention comprises the condensation polymerization products of following components: (a) binary isocyanate system formed by diphenylmethane-4, <4>- diisocyanate(MDI) and 1, 6-hexylidene diisocyanate(HDI), (b) polyatomic alcohol, and (c) organic hydroxyl compound with carboxyl. The invention also relates to an aquosity polyurethane adhesive manufactured by the polyurethane prepolymer, and the aquosity polyurethane adhesive manufactured of the invention has the advantages of low manufacturing cost, low activating temperature and high adhesive strength, and more particularly being applicable for shoes making field.

Description

technical field [0001] The present invention relates to the field of water-based polyurethane adhesives, more specifically, the present invention relates to a novel polyurethane prepolymer and a preparation method thereof, a water-based polyurethane adhesive and a preparation method thereof, and the water-based polyurethane adhesive Applications in fields such as shoemaking. Background technique [0002] With the advancement of science and technology, and the increasingly stringent requirements of environmental protection laws and regulations, the research and development of environmentally friendly adhesives has been paid more and more attention. Environmentally friendly adhesives mainly include water-based adhesives and solvent-free adhesives. Solvent-free adhesives are generally called hot-melt adhesives, which are composed of 100% by weight thermoplastic resins, do not contain any moisture or solvents, can flow in a molten state, and have bonding properties after coolin...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G18/72C09J175/04A43B13/32
Inventor 林金河朱立超林洪凯袁迪强赵婷胡运华
Owner 北京林氏精化新材料有限公司
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