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Polyurethane resin with intelligent moisture permeating function for synthetic leather surface coating and preparation method thereof

A technology of polyurethane resin and surface finishing, applied in the field of polyurethane resin, can solve the problems of low strength, low price, poor moisture permeability and hydrolysis resistance, etc., and achieve the effect of good mechanical properties and good moisture permeability.

Inactive Publication Date: 2012-07-04
FUJIAN DONGTAI HIGH POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyethylene glycol in polyether glycol, the ether bond in its molecule is a typical non-ionic hydrophilic group, water molecules move easily between them, and the moisture permeability rate is high. Polyurethane with polyethylene glycol as the soft segment Has high moisture permeability, elongation, low price, good hydrolysis resistance, but low strength
The polyurethane resin with polyester diol as the soft segment has excellent mechanical properties, good film-forming performance, heat resistance and light resistance, but poor moisture permeability and hydrolysis resistance, and the price is relatively high.

Method used

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  • Polyurethane resin with intelligent moisture permeating function for synthetic leather surface coating and preparation method thereof
  • Polyurethane resin with intelligent moisture permeating function for synthetic leather surface coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 60g of polyethylene glycol with a number-average molecular mass of 6000 and 20g of polyethylene adipate with a number-average molecular mass of 2000 into a 1000mL three-necked flask with a stirrer, raise the temperature to 110°C, and start Stir and dehydrate under vacuum for 3 hours, then cool to 60°C, blow in nitrogen to release the vacuum, add 40g of dimethylformamide, and stir evenly. Then add 5g of 4,4'-diphenylmethane diisocyanate, react at 60°C for 4h, and add 80g of dimethylformamide according to the viscosity of the reactant. After the prepolymerization is completed, 4.5g 1,4-butanediol and 12.5g 4,4'-diphenylmethane diisocyanate are added successively, and after reacting for 3 hours at 70°C, 118g dimethylformamide is added to obtain a solid containing Most 30% polyurethane solution.

[0023] The obtained polyurethane solution was coated on the synthetic leather base, and the moisture permeability at various temperatures was tested as shown in Table 1.

[...

Embodiment 2

[0027] Add 60g of polyethylene glycol with a number-average molecular mass of 6000 and 20g of polybutylene adipate with a number-average molecular mass of 2000 into a 1000mL three-necked flask with a stirrer, raise the temperature to 110°C, and start Stir and dehydrate under vacuum for 3 hours, then cool to 80°C, blow in nitrogen to release the vacuum, add 30g of dimethylacetamide, and stir well. Then add 5g of 4,4'-diphenylmethane diisocyanate, react at 80°C for 2h, and add 100g of dimethylacetamide according to the viscosity of the reactant. After the prepolymerization is completed, 4.9g of 1,4-butanediol and 13.5g of 4,4'-diphenylmethane diisocyanate are added successively, and after reacting for 2 hours at 80°C, 62g of dimethylacetamide is added to obtain a solid content of 35% polyurethane solution.

[0028] The obtained polyurethane solution was coated on the synthetic leather base, and the moisture permeability at various temperatures was tested as shown in Table 2.

...

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Abstract

The invention relates to a polyurethane resin with an intelligent moisture permeating function for a synthetic leather surface coating, wherein an organic polyalcohol polymer is a mixture of polyester diol and polyether diol, and the mass ratio of the polyester diol and the polyether diol is 1:0.2-4; diisocyanate is 4,4'-methylene diphenyl diisocyanate, toluene diisocyanate or isophorone diisocyanate; and the extending chain is 1,4-butanediol, ethanediol or diglycol. The invention combines the advantages of polyurethane adopting the polyester diol as a soft segment and polyurethane adopting polyethylene glycol as a soft segment and learns from strong points to offset weakness, and the obtained polyurethane has better moisture permeability and favorable mechanical performance; the intelligent moisture permeating conversion temperature of the polyurethane resin ranges from 20 DEG C to 50 DEG C and can be controlled by adjusting the molecular weight and proportion of the polyester diol and the polyethylene glycol.

Description

technical field [0001] The invention relates to a polyurethane resin, in particular to a polyurethane resin for surface coating of synthetic leather with an intelligent moisture-permeable function and a preparation method thereof. Background technique [0002] With the continuous improvement of living standards, people are not only satisfied with the covering and cold protection functions of clothing and footwear, but also have higher and higher requirements for wearing comfort. In people's physiological activities, the human body lowers and balances the body temperature through part of the unconscious sweat evaporation. If the moisture permeability of clothing and footwear is not good, it will make people feel stuffy because the sweat cannot be discharged in the form of steam. Wearing for a long time, condensation will form inside the clothing and shoes, making people feel damp and uncomfortable. At the same time, the accumulated sweat is easy to breed bacteria. Consideri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/12D06M15/564D06N3/14
Inventor 刘若望袁继新代道胜
Owner FUJIAN DONGTAI HIGH POLYMER MATERIAL CO LTD