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Preparation method of wet-curing reaction type polyurethane hot melt adhesives for shoes

A polyurethane hot-melt adhesive and moisture-curing technology, which is applied in the field of polyurethane adhesives, can solve the problems of poor water resistance, inferior to ester bonds, and low bonding strength, and achieve good durability, strong hygroscopicity, and high bonding strength.

Inactive Publication Date: 2008-09-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Polyester polyols are mostly used in the preparation of moisture-curing reactive polyurethane hot melt adhesives, because they have a certain degree of crystallinity and are polar molecules, which can double the cohesion and adhesion of the adhesive layer and improve the initial bonding strength. And the final bonding strength, but because it contains ester bonds, it is easy to hydrolyze, so the water resistance of polyester-based polyurethane adhesives is poor; if polyether polyols are used, because the ether bond structural units belong to flexible chains, and the ether bonds are not easy to hydrolyze, so Compared with the corresponding polyester polyol, it has better flexibility, hydrolysis resistance and low temperature resistance, but the polarity of the ether bond is not as good as that of the ester bond, so its bonding strength is too low

Method used

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  • Preparation method of wet-curing reaction type polyurethane hot melt adhesives for shoes

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A preparation method for moisture-curing reactive polyurethane hot-melt adhesive for shoes, which comprises the following steps:

[0025] 1) Selection of raw materials: The raw materials are weighed according to the following parts by weight: 65 parts of hydroxyl-terminated liquid rubber, 15 parts of polyether diol, 13 parts of toluene diisocyanate, 4 parts of trimethylolpropane (crosslinking agent), viscosity-increasing 12 parts of resin, 0.2 part of catalyst;

[0026] Described hydroxyl-terminated liquid rubber is hydroxyl-terminated polybutadiene; described polyether glycol is polyether glycol (N210) (Shanghai Shengyi Chemical Trade Co., Ltd.); described toluene diisocyanate is 2 , 4-toluene diisocyanate; Described tackifying resin is terpene resin; Described catalyst is dibutyltin dilaurate;

[0027] 2) Add hydroxyl-terminated polybutadiene and polyether diol (N210) into a four-necked flask equipped with an electric stirring device, a heating device, a thermometer ...

Embodiment 2

[0032] The preparation method is the same as in Example 1, only the polyether diol (N210) is replaced with polytetrahydrofuran diol. The test results of its basic physical properties are shown in Table 1.

Embodiment 3

[0034] A preparation method for moisture-curing reactive polyurethane hot-melt adhesive for shoes, which comprises the following steps:

[0035] 1) Selection of raw materials: The raw materials are weighed according to the following parts by weight: 60 parts of hydroxyl-terminated liquid rubber, 15 parts of polyether diol, 13 parts of toluene diisocyanate, 4 parts of trimethylolpropane (crosslinking agent), viscosity increasing 12 parts of resin, 0.2 part of catalyst;

[0036] Described hydroxyl-terminated liquid rubber is hydroxyl-terminated polybutadiene-acrylonitrile; described polyether glycol is polyether glycol (N210) (Shanghai Shengyi Chemical Trading Co., Ltd); Isocyanate is 2,6-toluene diisocyanate; Described tackifying resin is coumarone resin; Described catalyst is tertiary amine (triethanolamine);

[0037] 2) Add hydroxyl-terminated polybutadiene-acrylonitrile and polyether diol (N210) into a four-necked flask equipped with electric stirring device, heating device...

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Abstract

The invention relates to a preparation method of polyurethane hot-melt adhesive for shoes. The preparation method of wet curing reaction type polyurethane hot-melt adhesive for shoes comprises: 1) selecting material; 2) mixing end-™¶Ã”¨ fluid rubber and polyether diol, heating to 100-110 degree and dewatering for 1-2 hour at vacuum degree of below 0.67 kPa; 3) cooling to 80-90 degree and adding toluene diisocynate and reacting for 2-3 hour; 4) cooling to 40-50 degree and adding trimethylolpropane, tie resin and catalyst and continuously stirring for 20-30 minute; 5) cooling and stopping the reaction when the content of isocyanate group is 6-8% (weight) and the viscosity is 800-1000 centipoise; vacuum degassing for 30 minutes again and discharging under the nitrogen protection and sealed packaging to obtain the polyurethane hot-melt adhesive for shoes. The polyurethane hot-melt adhesive for shoes has high bond strength and environmental protection and excellent anti-hydrolization performance.

Description

technical field [0001] The invention belongs to the technical field of polyurethane adhesives, and in particular relates to a preparation method of polyurethane hot-melt adhesives for shoes. Background technique [0002] Among all kinds of adhesives for shoes, outsole adhesive is the most important, with the highest adhesive performance requirements, and it is also the adhesive type that shoe manufacturers and adhesive manufacturers pay the most attention to. At present, the adhesives for sticking outsoles are basically polyurethane and neoprene. However, due to the extensive use of polyvinyl chloride (PVC) artificial leather, thermoplastic rubber, and polyurethane (PU) synthetic leather in the shoemaking industry, the first generation of ordinary neoprene adhesives can no longer satisfy the bonding of these materials, and it is difficult to adapt to the shoemaking industry. According to the requirements of development, polyurethane adhesives are considered to be one of the...

Claims

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Application Information

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IPC IPC(8): C09J175/04A43D25/00
Inventor 高山俊沈春晖
Owner WUHAN UNIV OF TECH
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