Solvent-free polyurethane capable of absorbing grains and preparation method thereof

A technology of solvent-free polyurethane and polyester polyol, which is applied in textiles and papermaking, can solve the problems of increasing the energy consumption of embossing and increasing the difficulty of embossing of solvent-free polyurethane, and achieves low viscosity flow temperature, excellent embossing effect and Mechanical properties, feel full effect

Active Publication Date: 2021-11-02
JIAXING HEXIN CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the related technologies mentioned above, the inventor believes that the viscous flow temperature of solvent-free polyurethane is relatively high, and it needs to be abo

Method used

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  • Solvent-free polyurethane capable of absorbing grains and preparation method thereof
  • Solvent-free polyurethane capable of absorbing grains and preparation method thereof
  • Solvent-free polyurethane capable of absorbing grains and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0039] Preparation Example 1

[0040] The preparation method of polyester polyol is as follows: fully react 408g of 1,2-propanediol and 615g of adipic acid at a temperature of 220°C, after dehydration treatment, vacuum treatment under the condition of vacuum degree of 0.1Mpa , to prepare a polyester polyol with a molecular weight of 1000 g / mol.

Example Embodiment

[0041] Preparation example 2

[0042] The preparation method of polyester polyol is as follows: fully react 408g of 1,2-propanediol and 615g of adipic acid at a temperature of 220°C, after dehydration treatment, first vacuumize under the condition of vacuum degree of 0.06Mpa , and then vacuumized under the condition of a vacuum degree of 0.1Mpa to prepare a polyester polyol with a molecular weight of 1000g / mol.

Example Embodiment

[0044] Example 1

[0045] A preparation method for absorbable texture-free solvent-free polyurethane, comprising the following steps:

[0046] S1, prepare component A, component B and component C respectively;

[0047] The preparation method of component A is as follows: at 55°C, put 1,6-hexanediol, 1,5-pentanediol, phosphite and the polyester polyol prepared in Preparation Example 1 in the reaction kettle After mixing and stirring at a speed of 143 rpm for 1 hour, component A was prepared, and the specific dosage is shown in Table 2;

[0048] The preparation method of component B is as follows: at 75°C, add polybutadiene diol to a reaction kettle containing toluene diisocyanate and diphenylmethane diisocyanate, and react for 2 hours to obtain an NCO content of 12.9%. Component B, the specific dosage is shown in Table 2;

[0049] Wherein the preparation method of component C is as follows: DBU-formate and copper-bismuth catalyst are mixed and stirred uniformly in the reacto...

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Abstract

The invention relates to the field of research and development of polyurethane resin, and particularly discloses solvent-free polyurethane capable of absorbing grains and a preparation method thereof. The invention relates to solvent-free polyurethane capable of absorbing grains. The solvent-free polyurethane is prepared from 90-112 parts of a component A, 60-120 parts of a component B and 0.05-0.4 part of a component C, the component A is prepared from the following raw materials: polyester polyol, a chain extender and an antioxidant, and the polyether polyol is formed by polymerizing 1, 2-propylene glycol and adipic acid; the component B is prepared from the following raw materials: aromatic diisocyanate and polybutadiene dihydric alcohol; and the component C is a catalyst. The preparation method comprises the following steps: S1, respectively preparing the component A, the component B and the component C; and S2, mixing and stirring the component A, the component B and the component C to obtain the product. The solvent-free polyurethane prepared by the invention is low in viscous flow temperature and has a relatively good grain absorption effect; and the preparation method is simple to operate and easy to control.

Description

technical field [0001] The application relates to the field of research and development of polyurethane resins, more specifically, it relates to a solvent-free polyurethane that can absorb texture and a preparation method thereof. Background technique [0002] As a type of polyurethane elastomer, polyurethane synthetic leather has a lustrous and soft appearance with a strong genuine leather feel, and is the most ideal substitute for natural leather. [0003] Polyurethane synthetic leather includes solvent-based synthetic leather, water-based synthetic leather and solvent-free synthetic leather. Solvent-free synthetic leather does not need to add solvents during production and processing, which is environmentally friendly and meets the development needs of green chemical industry. [0004] For solvent-free synthetic leather, the liquid solvent-free polyurethane is usually scraped and dried on the surface of the base fabric, and then the dried solvent-free polyurethane is heat...

Claims

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Application Information

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IPC IPC(8): C08G18/69C08G18/66C08G18/42C08G18/32D06N3/14
CPCC08G18/698C08G18/664C08G18/4238C08G18/3206D06N3/14D06N2211/28D06N2209/103
Inventor 徐欣欣石磊晏雪生纪尚超冯敏超李寿伟
Owner JIAXING HEXIN CHEM IND
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