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Hot-melt adhesive for bonding layer of artificial leather and preparation method as well as application thereof

A technology of hot-melt adhesive and artificial leather, which is applied in the field of roller coating and knife coating, and can solve the problem of product peel strength, hot-melt adhesive high temperature resistance, chemical resistance, acid resistance, alkali resistance, flexibility and The hardness is difficult to meet the requirements, difficult to use, etc.

Inactive Publication Date: 2012-08-01
江阴市诺科生物新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current water-based polyurethane is used for the adhesive layer of artificial leather, and there are certain deficiencies.
The oligomer polyols used to prepare water-based polyurethane mainly include polyether and polyester polyols. Traditional polyesters or polyethers cannot fully meet the performance requirements of hot-melt adhesives in the field of artificial leather, which is reflected in hot-melt adhesives. It is difficult to meet the requirements of high temperature resistance, chemical resistance, acid resistance, alkali resistance, flexibility and hardness balance
[0005] At present, the acetone method is mostly used in the preparation of waterborne polyurethane. Regulated, more difficult to use
[0006]Because the water-based hot melt adhesive is difficult to wet on the waterproof treated substrate cloth, it affects the peel strength of the product
The use of water-based polyurethane alone cannot fully meet the performance requirements of all aspects

Method used

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  • Hot-melt adhesive for bonding layer of artificial leather and preparation method as well as application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] A kind of water-based polyurethane hot-melt adhesive for artificial leather, its preparation method, comprises the steps: with 100 kilograms of toluene diisocyanate (TDI), molecular weight is 383 kilograms of polybutylene adipate glycols of 2000, drop into reaction React in the kettle at 90°C for 1 hour, add 21 kg of diethylene glycol, 17 kg of dimethylol propionic acid and 0.5 kg of dibutyltin dilaurate and react at 50°C for 5 hours, and use acetone to adjust the viscosity of the system during the reaction After the reaction, cool down to 35°C and add 13 kg of triethylamine and 4,806 kg of water to emulsify to obtain a white emulsion. Distill the emulsion under reduced pressure at 60°C and -0.05MPa to remove acetone, and obtain a solid content of 10%. The left and right artificial leather bonding layers use hot melt adhesive water-based polyurethane emulsion.

Embodiment 2

[0084] A kind of water-based polyurethane hot-melt adhesive for artificial leather, its preparation method, comprises the steps: with 100 kilograms of toluene diisocyanate (TDI), molecular weight is 115 kilograms of polybutylene adipate diols of 2000, epoxy Resin (E51) 27 kg, aromatic polyhydroxyl special polyether (hydroxyl value 110) 55 kg, put into the reaction kettle and react at 60°C for 3 hours, add diethylene glycol 30 kg, dimethylol propionic acid 15 kg Kg and 1.4 kg of dibutyltin dilaurate were reacted at 65°C for 2 hours. During the reaction, 30 kg of acetone and 30 kg of ethyl acetate were used to adjust the viscosity of the system. After the reaction, the temperature was lowered to 50°C and 11 kg of triethylamine and 400 kg of water were added. Emulsify to obtain a white emulsion, distill the emulsion under reduced pressure at 20°C and -0.1MPa to remove acetone and ethyl acetate, and then make a hot-melt adhesive water-based polyurethane for artificial leather adhes...

Embodiment 3

[0086] A kind of water-based polyurethane hot-melt adhesive for artificial leather, its preparation method, comprises the steps: with 100 kilograms of toluene diisocyanate (TDI), molecular weight is 287 kilograms of polybutylene adipate diols of 3000, epoxy Resin (E51) 2.3 kg, aromatic polyhydroxyl special polyether (hydroxyl value 110) 2 kg, put into the reaction kettle and react at 85°C for 1.5 hours, add 30 kg of diethylene glycol, 2.8 kg of trimethylolpropane , 15 kg of dimethylol propionic acid and 0.5 kg of stannous octoate were reacted at 60°C for 4 hours. During the reaction, 100 kg of methyl acetate was used to adjust the viscosity of the system. After the reaction, the temperature was lowered to 35°C and 11 kg of triethylamine was added. 1050 kg of emulsified to obtain a white emulsion, the emulsion was distilled under reduced pressure at 45°C and -0.06MPa to remove methyl acetate, and then a water-based polyurethane hot-melt adhesive for artificial leather adhesive l...

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Abstract

The invention relates to a hot-melt adhesive for the bonding layer of artificial leather and a preparation method as well as application thereof. The preparation method comprises the following steps of: firstly reacting low polymer polyalcohol, an expoxy resin and aromatic polyhydroxy special polyether with diisocyanate, then adding a hydrophilic chain extender and a micromolecule polyalcohol chain extender for carrying out chain extension reaction to obtain an intermediate product, neutralizing by using organic amine, emulsifying by using water to generate a polyurethane emulsion, finally removing an organic solvent at a reduced pressure to obtain a waterborne polyurethane emulsion, adding a special organic silicon surface active agent, a FeCl3 aqueous solution, a waterborne curing agent, natural rubber, chloroprene rubber, nitrile butadiene rubber and a thickening agent, and preparing the hot-melt adhesive for the bonding layer of artificial leather. The bonding layer of artificial leather is used for compositing spinning fabrics and PVC (Polyvinyl Chloride) / cloth in the fields of bags, suitcases and clothing. The prepared adhesive has the excellent performances of firm bonding strength, water resistance, acid resistance, alkali resistance and the like and is applied to the artificial leather fields of clothing, bags, suitcases and the like.

Description

technical field [0001] The invention relates to a hot-melt adhesive for an artificial leather adhesive layer and a preparation method and application thereof, and is especially suitable for knife coating and roller coating processes in the production of artificial leather such as clothing, luggage, etc., and belongs to the field of chemical products. Background technique [0002] Polyurethane (PU) is a polymer material with a wide range of uses. Its raw materials range widely and can be used in many aspects such as coatings, rubber, plastics, and elastomers. At present, most of the hot melt adhesives widely used in the field of artificial leather on the market are solvent-based polyurethanes. A large amount of organic solvents are produced during the production and use of solvent-based polyurethane hot-melt adhesives for artificial leather, causing serious pollution to the environment. At the same time, artificial leather will also leave some aromatic solvents such as benzen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J107/00C09J111/02C09J109/02C09J11/04C09J11/06C08G18/12C08G18/48
Inventor 华明扬华伽杰
Owner 江阴市诺科生物新材料科技有限公司
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