Solvent-free polyurethane resin and preparation method and application thereof

A solvent-free polyurethane and polyurethane resin technology, applied in the field of polyurethane, can solve the problems of flat and stiff leather feel, insufficient lubrication between molecular chains, etc., to improve material compatibility, soft and plump hand feel, and delicate crease. Effect

Active Publication Date: 2021-10-22
ZHEJIANG HUAFON SYNTHETIC RESIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, since the molecular structure of solvent-free polyurethane resin used in solvent-free polyurethane synthetic leather is a highly cross-linked structure, the lubrication between molecular chains is insufficient, and the finished leather The hand feels slightly flat and thin, and it is mostly used in the field of sofa leather that does not require high softness. It is slightly insufficient in the field of garment leather that requires high hand feel.

Method used

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  • Solvent-free polyurethane resin and preparation method and application thereof
  • Solvent-free polyurethane resin and preparation method and application thereof
  • Solvent-free polyurethane resin and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example 1

[0068] A kind of tall oil diol, its preparation method comprises the steps:

[0069] (1) Tall oil and thionyl chloride were reacted at 80° C. for 5 h, separated and purified to obtain tall oil chloride; the molar ratio of carboxyl in the thionyl chloride to tall oil was 2.5:1

[0070] (2) The tall oil chloride obtained in step (1) is slowly added dropwise in the DMF solution of dopamine under ice bath conditions (the mol ratio of the acid chloride group in dopamine and tall oil chloride is 1.1:1), and the dropwise addition ends Afterwards, continue mixing in the ice bath for 30 min, remove the ice bath, and react at 80° C. for 4 h to obtain the tall oil diol.

preparation example 2

[0072] A kind of tall oil diol, its preparation method comprises the steps:

[0073] (1) Tall oil and thionyl chloride were reacted at 70° C. for 6 h, separated and purified to obtain tall oil chloride; the molar ratio of the carboxyl groups in the thionyl chloride to tall oil was 3:1

[0074] (2) The tall oil acid chloride obtained in step (1) is slowly added dropwise in the DMF solution of dopamine under ice bath conditions (the mol ratio of the acid chloride group in dopamine and tall oil acid chloride is 1.2:1), and the dropwise addition ends Afterwards, continue mixing in the ice bath for 30 min, remove the ice bath, and react at 70° C. for 5 h to obtain the tall oil diol.

preparation example 3

[0076] A kind of tall oil diol, its preparation method comprises the steps:

[0077] (1) Tall oil and thionyl chloride were reacted at 100° C. for 4 h, separated and purified to obtain tall oil chloride; the molar ratio of the carboxyl groups in the thionyl chloride to tall oil was 2:1

[0078] (2) The tall oil acid chloride obtained in step (1) is slowly added dropwise in the DMF solution of dopamine under ice bath conditions (the mol ratio of the acid chloride group in dopamine and tall oil acid chloride is 1:1), and the addition ends Afterwards, continue mixing in the ice bath for 30 min, remove the ice bath, and react at 90° C. for 3 h to obtain the tall oil diol.

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Abstract

The invention provides solvent-free polyurethane resin and a preparation method and application thereof. The solvent-free polyurethane resin comprises a component A and a component B; the component A comprises polyether polyol and tall oil glycol in specific parts; the component B comprises a polyurethane prepolymer; according to the solvent-free polyurethane resin, tall oil glycol containing a large side chain is added into the component A to replace traditional micromolecular glycol to serve as a chain extender, so that the compatibility among all the components is effectively improved, the lubricity of a molecular chain is improved, the finally obtained finished synthetic leather is soft and full in hand feeling, and the grade of the synthetic leather product is improved.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, and in particular relates to a solvent-free polyurethane resin and its preparation method and application. Background technique [0002] With the enhancement of human awareness of environmental protection and the increasing restrictions on environmental protection in various countries in the world, the environmental protection issues of the polyurethane synthetic leather industry have been increasingly valued by all links in the industry chain, and the use of traditional solvent-based polyurethane has received more and more attention. Therefore, the deorganosolvation production technology of polyurethane synthetic leather industry is imminent. [0003] Solvent-free polyurethane synthetic leather production technology has gradually entered the field of vision of polyurethane synthetic leather manufacturers in the past two years due to its superior environmental protection performance, low pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/36C08G18/10D06N3/14
CPCC08G18/6696C08G18/48C08G18/36C08G18/10D06N3/145
Inventor 张健张初银张兵朱加秋
Owner ZHEJIANG HUAFON SYNTHETIC RESIN
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