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Leather adhesive with high scratch resistance

A kind of adhesive and leather technology, applied in the direction of adhesive types, other rubber adhesives, polyurea/polyurethane adhesives, etc., can solve problems such as insufficient strength of the adhesive film, cracking of the bonding place, and separation of leather, etc. To achieve the effect of improving the bond strength, enhancing the binding force and reducing the moisture content

Active Publication Date: 2015-04-01
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; moreover, the film formed by the adhesive is not strong enough, and when external forces act, such as scratching, rubbing When kneading, pulling, etc. act on the surface of the film or the upper and lower leather surfaces connected by the film, it is easy to cause the film to be misaligned or separated from the leather because the film is too hard and brittle or the internal bonding of the film is insufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 adopts the following steps to prepare the high scratch resistance leather adhesive of the present invention:

[0025] (1) Add polypropylene oxide (polypropylene glycol) diol and hydrogenated diphenylmethane diisocyanate into a three-necked flask according to the ratio of OH:NCO=1:2, blow in nitrogen gas, and stir the reactants evenly. Reaction at ℃ for 2 hours to prepare a polyurethane prepolymer, then add 1 / 2 of the neopentyl glycol dosage of 2% of the mass of the polyurethane prepolymer, and continue the reaction for 1 hour;

[0026] (2) Cool down the reaction system in step (1) to 70°C, add waste rubber nano-powder with a particle size of 0.1-10 μm and accounting for 0.8% of the mass of the prepolymer, and the remaining neopentyl glycol to react for 6 minutes;

[0027] (3) Mix 2,2-dimethylolpropionic acid with 20% mass of polyurethane prepolymer and deionized water with 45% mass of polyurethane prepolymer evenly, then add carboxybutyl 4% mass of polyuret...

Embodiment 2

[0029] Embodiment 2 adopts the following steps to prepare the high scratch resistance leather adhesive of the present invention:

[0030] (1) Add polypropylene oxide (polypropylene glycol) diol and hydrogenated diphenylmethane diisocyanate into a three-necked flask according to the ratio of OH:NCO=1:2, blow in nitrogen gas, and stir the reactants evenly. Reaction at ℃ for 2 hours to prepare a polyurethane prepolymer, then add 1 / 2 of the neopentyl glycol dosage of 6% of the mass of the polyurethane prepolymer, and continue the reaction for 1 hour;

[0031] (2) Cool down the reaction system in step (1) to 60°C, add waste rubber nano-powder with a particle size of 0.1-10 μm and accounting for 2.7% of the mass of the prepolymer, and the remaining neopentyl glycol to react for 5 minutes;

[0032] (3) Mix 2,2-dimethylolpropionic acid with 10% mass of polyurethane prepolymer and deionized water with 35% mass of polyurethane prepolymer evenly, and then add carboxybutyl 8% mass of poly...

Embodiment 3

[0034] Embodiment 3 adopts the following steps to prepare the high scratch resistance leather adhesive of the present invention:

[0035] (1) Add polypropylene oxide (polypropylene glycol) diol and hydrogenated diphenylmethane diisocyanate into a three-necked flask according to the ratio of OH:NCO=1:2, blow in nitrogen gas, and stir the reactants evenly. Reaction at ℃ for 1 hour to prepare a polyurethane prepolymer, then add 1 / 2 of the neopentyl glycol dosage of 1% of the mass of the polyurethane prepolymer, and continue the reaction for 2 hours;

[0036] (2) Cool down the reaction system in step (1) to 66°C, add waste rubber nano-powder with a particle size of 0.1-10 μm and accounting for 10% of the mass of the prepolymer, and the remaining neopentyl glycol to react for 10 minutes;

[0037] (3) Mix 2,2-dimethylol propionic acid with 25% mass of polyurethane prepolymer and deionized water with 30% mass of polyurethane prepolymer evenly, then add carboxybutyl 5% mass of polyure...

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PUM

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Abstract

The invention discloses a leather adhesive with high scratch resistance. The leather adhesive is prepared from raw materials namely dicyclohexylmethane diisocyanate, polypropylene oxide (polypropylene glycol) glycol, neopentyl glycol, waste rubber nano micro powder, 2,2-dimethylolpropionic acid, deionized water and carboxyl butadiene-styrene rubber. The adhesive is high in solid content, high in emulsion adhesion capacity, high in adhesion strength and excellent in film-forming property. An adhesive film formed by the adhesive has the characteristics of scraping resistance, high toughness and the like.

Description

technical field [0001] The invention relates to a leather adhesive, in particular to a leather adhesive with high scratch 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, leat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/14C09J121/00C08G18/75C08G18/69C08G18/66C08G18/48C08G18/32C08G18/34C08G18/10
Inventor 林斌生
Owner GUANGDONG FION LEATHER CO LTD
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