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Method for preparing solvent-free low-viscosity UV-cured polyurethane acrylate leather coating agent

A polyurethane acrylate, leather finishing agent technology, applied in polyurea/polyurethane coatings, devices for coating liquid on surfaces, coatings, etc., can solve problems such as affecting the use of coatings, danger, and gel time reduction.

Inactive Publication Date: 2005-09-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above patents do not involve the exothermic problem in the reaction process, and the heat of reaction between isocyanate and hydroxyl is 45-140kJ / mol, which is very dangerous for solvent-free bulk polymerization and will lead to The temperature of the reaction system rises sharply; and as the temperature of the reaction system rises, the gel time of the system decreases greatly, resulting in gelation of the reactant in the polymerization tank or during storage, which affects the use of the coating

Method used

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  • Method for preparing solvent-free low-viscosity UV-cured polyurethane acrylate leather coating agent
  • Method for preparing solvent-free low-viscosity UV-cured polyurethane acrylate leather coating agent
  • Method for preparing solvent-free low-viscosity UV-cured polyurethane acrylate leather coating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Add 46.5 grams of hydroxyethyl acrylate (accounting for 10.03% of the total mass), 0.3 grams of 2,6-di-tert-butyl -4-Methylphenol (0.065% of the total mass) was used as a polymerization inhibitor, stirred and heated to 50°C, and then 70 grams of toluene diisocyanate (15.09% of the total mass) was added to the system, and the reaction started. Measure the content of isocyanate in the system by the di-n-butylamine method, after the hydroxyl and isocyanate in the system reacted for 2 hours, add 200 grams of polyethylene glycol (average molecular weight 1000) (accounting for 43.12% of the total mass) , continue stirring. Within 2 hours, add 3 grams of catalyst triethylamine (accounting for 0.647% of the total mass) in 4 times on average, each time you will find that the temperature of the system rises by 1 to 2°C in 5 minutes, and after 5 to 10 minutes , the temperature slowly dropped back to 50°C. After the second step reaction was carried out for 6 to 7 hours, the react...

Embodiment 2

[0047] Add 57.6 grams of hydroxypropyl methacrylate (accounting for 16.27% of the total mass), 1.5 grams of nitrobenzene (accounting for total mass) 0.424% of the mass) as a polymerization inhibitor, stirred and heated to 50°C, then added 100 grams of 4,4'-diphenylmethane diisocyanate (accounting for 28.24% of the total mass) to the system, and the reaction started. The content of isocyanate in the system was measured by the di-n-butylamine method. After the reaction of hydroxyl groups and isocyanate in the system for 2 hours, 25 grams of ethylene glycol (accounting for 7.06% of the total mass) were added, and the stirring was continued. Within 2 hours, add 4 grams of catalyst triethylamine (accounting for 1.13% of the total mass) in 4 times on average, each time you will find that the temperature of the system increases by 2 to 3°C in 5 minutes, and after 5 to 10 minutes , the temperature slowly dropped back to 50°C. After the second step reaction was carried out for 6 to 7 ...

Embodiment 3

[0052] Add 52 grams of hydroxypropyl acrylate (9.49% of the total mass), 0.07 grams of 2,6-di-tert-butyl in the polymerization reactor equipped with nitrogen inlet, thermometer socket, stirrer socket, sampling port and condenser socket - 4-methylphenol (0.0128% of the total mass) was used as a polymerization inhibitor, stirred and heated to 30°C, and then 89 grams of isophorone diisocyanate (16.24% of the total mass) was added to the system to start the reaction. Measure the content of isocyanate in the system by the di-n-butylamine method. After the hydroxyl group in the system reacted for 2 hours with the isocyanate all reacted, add 300 grams of polypropylene glycol (average molecular weight 1500) (accounting for 54.74% of the total mass), continue Stir. The temperature was raised to 50° C., and within 2 hours, 4 grams of catalyst triethylamine (accounting for 0.730% of the total mass) was continuously added, and the temperature of the system was kept at 50° C. throughout. ...

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Abstract

The invention relates to a method for preparing a solventless and low-viscosity ultraviolet light curing polyurethane acrylate leather finishing. In the invention, using the ultraviolet light curing characteristic of double bonds of acrylate and the advantages of flexible and adjustable characteristics of polyurethanes to get the solventless and low-viscosity ultraviolet light curing polyurethane acrylate leather finishing by the reaction of isocyanic acid groups of polyisocyanates with hydroxyl groups of acrylates and polyatomic alcohol, at the same time, batch or continuous adding the catalyst to solve the problems of the temperature off-controlling and gelling. The said leather finishing has the characteristics of low viscosity, organic solventless and rapid ultraviolet light curing rate.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane acrylate leather finishing agent, in particular to a preparation method of a solvent-free, low-viscosity ultraviolet-cured polyurethane acrylate leather finishing agent. This leather finishing agent has the characteristics of low viscosity, no organic solvent, and fast ultraviolet curing speed, and is especially suitable as a finishing agent for leather or artificial leather. Background technique [0002] Leather finishing agent is a kind of substance that is coated on the surface of leather or artificial leather and endows the leather or artificial leather with softness, luster, wear resistance, corrosion resistance and solvent resistance. Therefore, leather finishing agents are generally liquid, organic solvent-based or water-based. [0003] From the perspective of the main polymer of leather finishing agents, there are three main categories: polyacrylates, polyur...

Claims

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Application Information

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IPC IPC(8): B05D7/12C09D175/14
Inventor 单国荣陈伟林翁志学
Owner ZHEJIANG UNIV
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