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Solvent-free polyurethane composition for synthetic leather

A solvent-free polyurethane and synthetic leather technology, applied in the field of polyurethane for synthetic leather, can solve the problems of poor mechanical properties, poor material fluidity, and high viscosity of solvent-free synthetic leather, and achieve reduced product defects, good mechanical properties, and good fluidity Effect

Inactive Publication Date: 2016-04-20
李善军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the polyurethane composition used for the production of solvent-free synthetic leather is polyether type, and the mechanical properties of the produced solvent-free synthetic leather are poor, which cannot meet the requirements of the downstream market of synthetic leather; Leather has high mechanical properties, but polyester polyols have high viscosity, and most of the hydroxyl groups at the end of the molecular chain are primary hydroxyl groups, which have high reactivity. Process requirements for the production of solvent synthetic leather

Method used

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  • Solvent-free polyurethane composition for synthetic leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Preparation of poly(1,4-butylene adipate) polyoxypropylene ether polyol

[0034] In a pressure-resistant reactor, add 200 grams of poly(1,4-butylene adipate) polyol with a number average molecular weight of 1000, a double metal cyanide complex catalyst, heat to 60°C-130°C, and vacuum out the water After mixing with volatile components, mix in an ultrasonic mixer for 0-60 hours.

[0035] At 80-150°C, under nitrogen protection and stirring conditions, add 10 grams of oxyalkylene into the pressure-resistant reaction kettle in the above step, and after the pressure in the reaction kettle drops significantly, gradually add 90 grams of the remaining part of oxyalkylene In the pressure-resistant reactor, after the reaction is completed, the unreacted oxyalkylene is removed, and the main chain structure of the molecule contains ester bonds and ether bonds, the end group or side group is a hydroxyl group, and the average molecular weight is 1500. Etherester polyols, as poly...

Embodiment 2

[0046] (1) Preparation of polycaprolactone polyoxypropylene ether polyol

[0047] In a pressure-resistant reactor, add 200 grams of polycaprolactone diol with a number-average molecular weight of 1000 and a double metal cyanide complex catalyst, heat to 60°C-130°C, and remove water and volatile components in a vacuum. Mix in an ultrasonic mixer for 0-60 hours. At 80-150°C, under nitrogen protection and stirring conditions, add 20 grams of oxyalkylene into the pressure-resistant reaction kettle in the above step, and after the pressure in the reaction kettle drops significantly, gradually add 180 grams of the remaining part of oxyalkylene In the pressure-resistant reactor, after the reaction is completed, the unreacted oxyalkylene is removed to obtain a polymer with a functionality of 2 containing ester bonds and ether bonds in the molecular main chain structure, terminal or side groups are hydroxyl groups, and an average molecular weight of 2000. Etherester polyols, as polyet...

Embodiment 3

[0058] (1) Preparation of polycarbonate polyoxypropylene ether polyol

[0059] In a pressure-resistant reactor, add 200 grams of polycarbonate diol with a number-average molecular weight of 1000 and a double metal cyanide complex catalyst, heat to 60°C-130°C, and remove water and volatile components in a vacuum. Mix in an ultrasonic mixer for 0-60 hours.

[0060] At 80-150°C, under nitrogen protection and stirring conditions, add 20 grams of oxyalkylene into the pressure-resistant reaction kettle in the above step, and after the pressure in the reaction kettle drops significantly, gradually add 180 grams of the remaining part of oxyalkylene In the pressure-resistant reactor, after the reaction is completed, the unreacted oxyalkylene is removed to obtain a polymer with a functionality of 2 containing ester bonds and ether bonds in the molecular main chain structure, terminal or side groups are hydroxyl groups, and an average molecular weight of 2000. Etherester polyols, as pol...

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Abstract

The invention discloses a solvent-free polyurethane composition for synthetic leather. The composition consists of a component A and a component B, wherein the component A comprises polyetherester polyol, polyester polyol, a crosslinking agent, a chain extender, a foam stabilizer, a catalyst, a foaming agent and the like; the component B comprises polyol, micromolecule alcohol and isocyanate; the mass content of -NCO is 10%-25%. The component A and the component B are subjected to moment mixing through a low pressure foaming machine or a high pressure foaming machine, and then the mixture is sprayed or poured onto release paper coated with surface polyurethane resin, uniformly scraped to be 1-2 mm in thickness with a scraper, and fed to a baking channel to be heated till the resin is semi-solidified, the semi-solidified is laminated with base cloth to be fed to a rear passage oven for curing. The composition is low in viscosity, good in flowability after being sprayed or poured onto the release paper, easy for scraper coating, and high in strength after formation.

Description

technical field [0001] The invention relates to polyurethane for synthetic leather, in particular to a solvent-free polyurethane composition for synthetic leather with high strength. Background technique [0002] The products of the synthetic leather industry mainly include artificial leather, synthetic leather and microfiber leather. It is mainly used to make products such as shoes, boots, clothing, bags, sofas, car interiors and ball games. In the usual classification method, artificial leather is a leather-like material made of textile cloth as the base cloth and coated with polymer slurry, most of which are coated with polyvinyl chloride, commonly known as PVC artificial leather. Synthetic leather is an imitation leather material made of non-woven fabric as the base cloth, impregnated with polymer materials and coated. Most of them use polyurethane as impregnating material and finishing agent, commonly known as PU synthetic leather. Polyurethane microfiber synthetic l...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42
CPCC08G18/664C08G18/4247
Inventor 李善军
Owner 李善军
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