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Preparation method of solventless ultraviolet-curing polyurethane for synthetic leather

A solvent-free, UV-light technology, applied in coatings, textiles, and papermaking, can solve solvent pollution and other problems, and achieve the effects of no pollution, convenient operation, and stable process

Active Publication Date: 2014-01-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing a solvent-free ultraviolet light-curable polyurethane for synthetic leather. Solvent pollution in the solvent-based polyurethane synthetic leather process and product safety issues caused by DMF residues in polyurethane synthetic leather products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In parts by weight, put 100 parts of vacuum dehydrated liquid PPG2000 and 30 parts of toluene diisocyanate (TDI) into a nitrogen-protected reactor, stir and mix well, add 20 parts of acrylic acid-2-hydroxyl Propyl ester and 0.1 part of dibutyltin dilaurate were reacted at 75°C for 60 minutes, the resulting reaction system was cooled, and then 0.10 part of 2-hydroxy-methylphenylpropan-1-one was added and stirred evenly, that is Obtain solvent-free UV curing polyurethane.

Embodiment 2

[0019] In parts by weight, put 100 parts of LS707-55 (Shanxi Kaixire Technology Co., Ltd.) in liquid form after vacuum dehydration and 20 parts of isophorone diisocyanate (IPDI) into a reactor protected by nitrogen After stirring and mixing uniformly, add 15 parts of 2-hydroxypropyl methacrylate and 0.16 parts of stannous octoate, and then react at 80°C for 53 minutes, cool the resulting reaction system, and then add 0.05 parts of 2-formaldehyde -1-(4-Methylthiophenyl)-2-morpholin-1-acetone, stir evenly to obtain solvent-free UV-curable polyurethane.

Embodiment 3

[0021] In parts by weight, 20 parts of vacuum dehydrated liquid LS707-55 (Shanxi Kaixier Technology Co., Ltd.), 80 parts of vacuum dehydrated liquid PPG1000 and 40 parts of diphenylmethylene diisocyanate (MDI ) Put it into a nitrogen-protected reactor, stir and mix well, add 30 parts of 2-hydroxyethyl acrylate, 0.1 parts of stannous octoate and 0.2 parts of dibutyltin dilaurate, and then at 85°C After reacting for 40 minutes, the obtained reaction system is cooled, and then 0.15 parts of 1-hydroxycyclohexyl phenyl ketone is added and stirred uniformly to obtain solvent-free UV-curable polyurethane.

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Abstract

The invention relates to a preparation method of a solventless ultraviolet-curing polyurethane for synthetic leather, which comprises the following steps: putting 100 parts by weight of vacuum-dehydrated dibasic alcohol and 20-40 parts by weight of liquid isocyanate with two -N=C=O functional groups into a reactor in a nitrogen protective atmosphere, uniformly mixing, adding 15-30 parts by weight of hydroxy acrylic acid monomer and 0.1-0.3 part by weight of catalyst, reacting at 75-85 DEG C for 40-60 minutes, cooling the obtained reaction system, adding 0.05-0.15 part by weight of photoinitiator, and stirring uniformly to obtain the solventless ultraviolet-curing polyurethane. When the polyurethane is used for producing synthetic leather, the coating can be cured under ultraviolet irradiation, can eliminate solvent contamination in the traditional synthetic leather production process, and has the characteristics of energy saving and high efficiency.

Description

Technical field [0001] The invention belongs to the technical field of polyurethane synthetic leather, and particularly relates to a preparation method of solvent-free ultraviolet light curing polyurethane for synthetic leather. Background technique [0002] Polyurethane synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a substitute for natural leather. Usually a non-woven fabric is used to simulate a mesh layer, and a foamed polyurethane coating is used to simulate a grain layer. The obtained synthetic leather is very similar to leather on the front and back, and has certain air permeability, which is closer to natural leather than ordinary artificial leather. It is widely used in making shoes, boots, bags and balls. [0003] At present, the production of polyurethane synthetic leather uses solvent-based polyurethane. A large amount of solvents such as dimethylformamide, toluene and methyl ethyl ketone are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/48C08G18/42D06N3/14
CPCC08G18/672D06N3/0059D06N2203/068D06N2207/123C08G18/6692C08G18/6659
Inventor 马兴元郭梦亚杨西萍胡雪丽
Owner SHAANXI UNIV OF SCI & TECH
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