Wet high-stripping polyurethane resin and preparation method thereof

A polyurethane resin, high peeling technology, applied in the field of polyurethane synthetic leather, can solve the problems of high residual DMF content on the leather surface, poor washing, slow vehicle speed, etc., and achieve the effects of improving regularity and cohesion, reducing energy consumption and improving regularity.

Active Publication Date: 2014-05-21
HEFEI ANLI POLYURETHANE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of slow vehicle speed, poor washing and high residual DMF on the leather surface in the preparation process of wet-type high-stripping polyure...

Method used

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  • Wet high-stripping polyurethane resin and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Add 400g of polyol compound PET-2 and 3g of antioxidant I-1010 into 1000g of solvent DMF;

[0054] (2) Stir the solution in (1) evenly, add 66g of diisocyanate, and react at 75°C for 2h in the presence of 0.8g of catalyst organic bismuth Mb20;

[0055] (3) Add 10g of ethylene glycol and 20g of MDA to (2), stir and react at 85°C for 0.5h; then add 400g of polyol compound PET-3, stir evenly, add 40g of diisocyanate, and carry out pre-treatment at 75°C Polymerization reaction 3h obtains prepolymer;

[0056] (4) Add 1400g of solvent DMF, 114g of ethylene glycol, and 460g of diisocyanate to the prepolymer. After stirring evenly, continue the reaction at 75°C for 5h; after the reaction is completed, add reaction terminator methanol to control its viscosity at 210Pas / 25 ℃ to obtain polyurethane resin.

[0057]

Embodiment 2

[0059] (1) Add 400g of polyol compound PET-3 and 2g of antioxidant 2246 into 1000g of solvent DMAC;

[0060] (2) Stir the solution in (1) evenly, add 100g of diisocyanate, and react at 80°C for 1.5h in the presence of 4g of catalyst organic bismuth Mb20;

[0061] (3) Add 12g of 1,4-butanediol and 18g of MDA to (2), stir and react at 80°C for 0.7h; then add 400g of polyol compound PET-2, stir evenly, add 50g of diisocyanate, The prepolymerization reaction was carried out at ℃ for 2.5h to obtain the prepolymer;

[0062] (4) Add 1400g of solvent DMF, 120g of 1,4-butanediol, and 500g of diisocyanate to the prepolymer. After stirring evenly, continue to react at 80°C for 4 hours; Control at 200Pas / 25°C to obtain polyurethane resin.

Embodiment 3

[0064] (1) Add 400g of polyol compound PET-2, 1g of antioxidant I-1010, and 2g of antioxidant 2246 into 1000g of solvent DMAC;

[0065] (2) Stir the solution in (1) evenly, add 135g of diisocyanate, and react at 75-85°C for 1-2h in the presence of 1.6g of catalyst organic bismuth Mb20;

[0066] (3) Add 15g of ethylene glycol and 24g of MOCA to (2), stir and react at 75°C for 0.9h; then add 400g of polyol compound PET-2, stir evenly, add 70g of diisocyanate, and carry out pre-treatment at 85°C Polymerization reaction 2h obtains prepolymer;

[0067] (4) Add 1400g of solvent DMF, 110g of ethylene glycol, and 440g of diisocyanate to the prepolymer. After stirring evenly, continue the reaction at 85°C for 3h; after the reaction is completed, add reaction terminator methanol to control its viscosity at 160Pas / 25 ℃ to obtain polyurethane resin.

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Abstract

The invention relates to wet high-stripping polyurethane resin and a preparation method thereof. The wet high-stripping polyurethane resin is prepared from diisocyanate, a polyol compound, a micromolecule dihydric alcohol chain extender, a micromolecule diamine chain extender, a catalytic agent, an antioxidant and a solvent. By adopting a prepolymer process, the phase separation degrees of a hard section and a soft section of the polyurethane resin are improved, meanwhile, the micromolecule dihydric alcohol chain extender and the micromolecule diamine chain extender are blocked into a polyester molecular chain by process control in the prepolymerization process, the regularity and the cohesion of the soft section are improved, the condensation speed of the resin can be obviously improved in a leather process, the vehicle speed can be significantly improved when high-stripping leather is produced, meanwhile, the dimethyl formamide (DMF) residual quantity on a solvent-type synthetic leather surface is effectively reduced, and the effects of reducing energy consumption and protecting the environment are achieved.

Description

technical field [0001] The invention relates to the technical field of polyurethane synthetic leather, in particular to a wet-type high-peeling polyurethane resin and a preparation method thereof. Background technique [0002] Wet-process polyurethane synthetic leather is the best substitute product for the new generation of natural leather. It has excellent properties, such as good air permeability, moisture permeability, smooth and plump feel and excellent mechanical strength, especially from the structure similar to natural leather. , so its products are widely used in clothing, shoes, bags, car cushions, sofas and other fields. [0003] Among them, high-stripping polyurethane synthetic leather is very popular in the sports shoe market, and has gradually replaced genuine leather to process sports shoes. However, the high-peeling polyurethane synthetic leather used for sports shoes, due to the lack of fillers in its formulation system, results in slow wet-leathering speed...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/42C08G18/32C08K5/134C08K5/526C08L75/06
CPCC08G18/12C08G18/227C08G18/664C08G18/6651C08G18/3206
Inventor 尹凯凯惠坚强武春余张彪
Owner HEFEI ANLI POLYURETHANE NEW MATERIAL
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