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Solvent-free polyurethane resin and application thereof to waterborne/non-solvent polyurethane synthetic leather with high peeling strength

A solvent-free polyurethane and solvent-free technology, which is applied in the field of synthetic leather manufacturing, can solve the problem of poor bonding strength between water-based polyurethane surface layer and solvent-free polyurethane foam layer, low water-based/solvent-free peel strength, and inability to apply peel strength to shoe leather To improve the poor peel strength, cross-link density between polymers, and excellent hydrolysis aging resistance

Active Publication Date: 2018-08-31
LIMING RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current water-based / solvent-free synthetic leather products still have the following main problems: (1) The bonding strength between the water-based polyurethane surface layer and the solvent-free polyurethane foam layer is poor, and its products cannot be applied to shoe leather that requires high peel strength; (2) The molecular weight of water-based polyurethane is low, resulting in poor hydrolysis aging resistance and short service life of this type of product
This method combines the water-based surface layer and the light-cured solvent-free intermediate layer to prepare water-based / solvent-free synthetic leather. Although the light-cured technology is used to improve the coating performance, it still does not solve the current problem of low water-based / solvent-free peel strength.

Method used

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  • Solvent-free polyurethane resin and application thereof to waterborne/non-solvent polyurethane synthetic leather with high peeling strength
  • Solvent-free polyurethane resin and application thereof to waterborne/non-solvent polyurethane synthetic leather with high peeling strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of water-based surface layer slurry and solvent-free foam layer slurry

[0037] a) Preparation of water-based surface layer slurry (parts by weight)

[0038] The preparation process of double-bond-terminated waterborne polyurethane resin is as follows: first add 20 parts by weight of isophorone diisocyanate, 100 parts of polyhexamethylene adipate diol and 1 part of dibutyltin dilaurate catalyst in the reactor, 75 ℃ for 1~2h, add 10 parts of dimethylolpropionic acid, heat up to 85℃ and react for 2h; then cool down to 50℃, add 4 parts of pentaerythritol triacrylate and 2 parts of p-hydroxyanisole inhibitor, 60℃ React for 3 hours; finally add triethylamine at 40°C and stir for 0.5 hours, then add 250 parts of deionized water and stir for 1-2 hours to obtain a double-bond-terminated water-based polyurethane emulsion.

[0039] 100 parts of double bond-terminated water-based polyurethane, 2 parts of photoinitiator (Darocurl173), 10 parts of water-based color ...

Embodiment 2

[0048] (1) Preparation of water-based surface layer slurry and solvent-free foam layer slurry

[0049] a) Preparation of water-based surface layer slurry (parts by weight)

[0050] The preparation process of the double-bond-terminated water-based polyurethane resin is as follows: first, 25 parts of isophorone diisocyanate, 90 parts of polyhexamethylene adipate diol and 1.5 parts of dibutyltin dilaurate catalyst, pass into N 2 After reacting at 90°C for 1.5h, cool down to 75°C, add 8 parts of dimethylol propionic acid, raise the temperature to 95°C for 2 hours; then cool down to 60°C, add measured 5 parts of pentaerythritol triacrylate and 1 part of p-hydroxybenzene Methyl ether polymerization inhibitor, react at 65°C for 4h; finally add triethylamine at 45°C and stir for 0.5h, then add 250 parts of deionized water and stir at high speed for 1.5h to obtain double bond-terminated water-based polyurethane emulsion.

[0051] 100 parts of double bond-terminated water-based polyur...

Embodiment 3

[0060] (1) Preparation of water-based surface layer slurry and solvent-free foam layer slurry

[0061] a) Preparation of water-based surface layer slurry (parts by weight)

[0062] First, add 30 parts of isophorone diisocyanate, 80 parts of polyhexamethylene adipate diol and 2 parts of dibutyltin dilaurate catalyst into a four-necked flask equipped with a thermometer and an electric stirrer, and feed N2, 88 After reacting at ℃ for 1 hour, cool down to 75℃, add 6 parts of dimethylol propionic acid, raise the temperature to 88℃ and react for 2 hours; Polymerizing agent, react at 65°C for 4h; finally add triethylamine at 45°C and stir for 0.5h, then add 300 parts of deionized water and stir at high speed for 1h to obtain a double-bond-terminated water-based polyurethane emulsion.

[0063] 100 parts of double bond-terminated water-based polyurethane, 5 parts of photoinitiator (Darocurl173), 1 part of water-based color paste, 5 parts of thickener (LW44), 2 parts of defoamer (BK-01...

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Abstract

The invention discloses a solvent-free polyurethane resin and an application thereof to waterborne / non-solvent polyurethane synthetic leather with high peeling strength. The solvent-free polyurethaneresin is composed of a component A and a component B and comprises 40-60 parts of polytetrahydrofuran glycol, 10-20 parts of 1,4-butanediol, 2-5 parts of hydroxyethyl acrylate, 5-10 parts of double-bond-containing polymer glycol, 0.05 part of delayed catalyst, 0.5-1 part of water and 2-5 parts of photoinitiator according to parts by weight, the component B is an oligomer glycol modified diphenylmethane diisocyanate prepolymer, and the weight ratio of the component A to the component B is 100: (60-70). The double-bond-containing polymer glycol is one or a mixture of several of hydroyl-terminated polybutadiene, hydroxyl-terminated hydrogenated polybutadiene, hydroxyl-terminated epoxidized polybutadiene resin and hydroxyl-terminated polyisoprene. The solvent-free polyurethane resin contains double bonds and is used as foamed layer slurry of waterborne / solvent-free synthetic leather so as to be used for preparing the synthetic leather with high peeling strength after being subjected to ultraviolet curing.

Description

technical field [0001] The invention belongs to the field of synthetic leather manufacture, and in particular relates to the preparation of water-based / solvent-free polyurethane synthetic leather. Background technique [0002] In recent years, the development of water-based synthetic leather, solvent-free synthetic leather, and TPU synthetic leather has advanced by leaps and bounds, and a series of major progress has been made, bringing new opportunities for the clean path of the synthetic leather industry. Among them, the development of water-based / solvent-free synthetic leather is even more eye-catching. Water-based / solvent-free synthetic leather products are currently a hot spot in the research of clean production of synthetic leather because of their various colors, handles, and excellent environmental performance. However, the current water-based / solvent-free synthetic leather products still have the following main problems: (1) The bonding strength between the water-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/67C08G18/69C08G18/32C08G18/40C08G18/42C08G18/48C08J9/08D06N3/00D06N3/14
CPCC08G18/3206C08G18/4018C08G18/4238C08G18/4854C08G18/672C08G18/698C08G2110/0083D06N3/0043D06N3/007D06N3/0097D06N3/145D06N3/146D06N3/147D06N2209/1621D06N2211/28C08G18/6674
Inventor 曹敏董火成赵修文张健李宁孙嘉鹏
Owner LIMING RES INST OF CHEM IND
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