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High-water-resistance leather adhesive

A water-resistant and adhesive technology, applied in the direction of adhesive types, polyurea/polyurethane adhesives, adhesives, etc., can solve the problems affecting the use, appearance and quality of leather products, cracking at the adhesive point, poor water resistance, etc. , to achieve the effect of good emulsion adhesion, improved bond strength and enhanced water resistance

Inactive Publication Date: 2015-04-08
GUANGDONG FION LEATHER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based polyurethane needs to have a certain water solubility to ensure the stability of its emulsion, and because water-based polyurethane contains water-based groups, it has poor water resistance. It is used for leather bonding, and there is still insufficient bonding strength. When leather When the product encounters a humid environment with a high moisture content, it is prone to cracking at the joint or separation of the adhesive from the leather, which affects the use, appearance and quality of the leather product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 adopts the following steps to prepare the high water resistance leather adhesive of the present invention:

[0018] (1) Add poly(1,4-butylene adipate) diol and hydrogenated diphenylmethane diisocyanate into a three-necked flask according to the ratio of OH:NCO=1:1.5, and blow nitrogen into the reactant Stir evenly, react at 100°C for 1 hour to obtain a polyurethane prepolymer, then add neopentyl glycol with 5% mass of the polyurethane prepolymer, and continue the reaction for 2 hours;

[0019] (2) Cool down to 70°C, add triethylamine with 1% mass of prepolymer and react for 5 minutes; then add carboxylated styrene-butadiene rubber with 5% mass of prepolymer and 2,2-dimethylol with 24% mass of prepolymer Propionic acid and 30% deionized water of the mass of the prepolymer were reacted for 2 hours to obtain it.

Embodiment 2

[0020] Embodiment 2 adopts the following steps to prepare the high water resistance leather adhesive of the present invention:

[0021] (1) Add poly(1,4-butylene adipate) diol and hydrogenated diphenylmethane diisocyanate into a three-necked flask according to the ratio of OH:NCO=1:1.5, and blow nitrogen into the reactant Stir evenly, react at 90°C for 2 hours to obtain a polyurethane prepolymer, then add neopentyl glycol with 3% mass of the polyurethane prepolymer, and continue to react for 2 hours;

[0022] (2) Cool down to 60°C, add triethylamine with 1% mass of prepolymer and react for 5 minutes; then add carboxylated styrene-butadiene rubber with 7% mass of prepolymer and 2,2-dimethylol with 16% mass of prepolymer Propionic acid and 32% deionized water of the mass of the prepolymer were reacted for 2 hours to obtain it.

Embodiment 3

[0023] Embodiment 3 adopts the following steps to prepare the high water resistance leather adhesive of the present invention:

[0024] (1) Add poly(1,4-butylene adipate) diol and hydrogenated diphenylmethane diisocyanate into a three-necked flask according to the ratio of OH:NCO=1:1.5, and blow nitrogen into the reactant Stir evenly, react at 100°C for 2 hours to obtain a polyurethane prepolymer, then add neopentyl glycol with 5% mass of the polyurethane prepolymer, and continue the reaction for 1 hour;

[0025] (2) Cool down to 70°C, add 0.5% triethylamine by mass of prepolymer and react for 5 minutes; then add carboxylated styrene-butadiene rubber with 11% mass of prepolymer and 2,2-dimethylol with 12% mass of prepolymer Propionic acid and 40% deionized water of the mass of the prepolymer were reacted for 1 hour to obtain it.

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PUM

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Abstract

The invention discloses a high-water-resistance leather adhesive which is prepared from hydrogenated diphenylmethane diisocyanate, poly-adipic acid-1,4-butanediol ester diol, neopentyl glycol, 2,2-dimethylolpropionic acid, deionized water, triethylamine and carboxyl butadiene styrene rubber. In the formula, the neopentyl glycol with branched chain is adopted to enhance the water resistance. By adding the 2,2-dimethylolpropionic acid, the polyurethane has favorable self-emulsifying effect and favorable emulsion adhesive force. The carboxyl butadiene styrene rubber can interact with the 2,2-dimethylolpropionic acid to enhance the water resistance, binding strength and solid content and endow the adhesive with favorable stability. The prepolymer formed by the preparation process in the method forms a crosslinked structure, thereby further enhancing the water resistance. The adhesive film formed by the prepared water-based polyurethane is soft.

Description

technical field [0001] The invention relates to a leather adhesive, in particular to a leather adhesive with high water resistance. Background technique [0002] With the development of technology, leather products have achieved diversified production and enriched people's lives. In the process of leather product processing, the bonding process of leather is an important process, and the leather adhesive affects the quality of leather products. [0003] Polyurethane adhesives refer to adhesives containing carbamate groups (-NHCOO-) or isocyanate groups (-NCO) in the molecular chain. Polyurethane adhesives are divided into two categories: polyisocyanate and polyurethane. Polyisocyanate molecular chains contain isocyano groups (-NCO) and carbamate groups (-NH-COO-), so polyurethane adhesives exhibit a high degree of activity and polarity. It has excellent chemical adhesion to substrates containing active hydrogen, such as porous materials such as foam, plastic, wood, leathe...

Claims

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Application Information

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IPC IPC(8): C09J175/06C09J175/14C08G18/75C08G18/69C08G18/66C08G18/42C08G18/32C08G18/34C08G18/10
Inventor 林斌生
Owner GUANGDONG FION LEATHER CO LTD
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