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Photoreversible self-healing solvent-free polyurethane composition, synthetic leather bass and preparation method of synthetic leather bass

A solvent-free polyurethane, self-healing technology, applied in the field of polyurethane, can solve the problems of easy hydrolysis and undurable coating, and achieve the effects of mild repair conditions, extended service life and excellent mechanical properties

Active Publication Date: 2019-05-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of using solvents for the traditional preparation of polyurethane synthetic leather, the coating is not durable, and is easy to hydrolyze, and the repair conditions are mild, and only need to be irradiated by visible light, avoiding the traditional self-healing requirements such as high temperature and ultraviolet rays Strong stimulating conditions such as light, the preparation method is fast, simple and harmless

Method used

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  • Photoreversible self-healing solvent-free polyurethane composition, synthetic leather bass and preparation method of synthetic leather bass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Under the protection of inert gas, mix 10g of isophorone diisocyanate (IPDI) and 21.6g of trifunctional polypropylene glycol (Mn=6000) evenly, and react at 70°C for 2h, measure the -NCO in the system The content determines the end point of the reaction, and the obtained-NCO content is the terminal isocyanate prepolymer B component of 11%;

[0029] Step 2: Under magnetic stirring in an ice bath, add selenium powder to deionized water containing dissolved sodium borohydride, the molar ratio of selenium powder and sodium borohydride is 2:1, stir the mixture for 15 minutes, and place in a steam bath After further warming, 2-bromoethanol was injected into the solution under the protection of nitrogen. React at 50°C for 6h and cool to room temperature, extract, and use anhydrous Na 2 SO 4 dry. Purification by column chromatography affords diselenodiol.

[0030] Step 3: Under the protection of an inert gas, stir components A such as diselenediol, organic bismuth ca...

Embodiment 2

[0033] Step 1: Under the protection of an inert gas, mix 10g of isophorone diisocyanate (IPDI) and 19.3g of trifunctional polypropylene glycol (Mn=6000) evenly, and react at 75°C for 3 hours to measure the - The content of NCO determines the end point of the reaction, and the obtained-NCO content is the terminal isocyanate prepolymer B component of 12%;

[0034] Step 2: Under magnetic stirring in an ice bath, add selenium powder to deionized water containing dissolved sodium borohydride, the molar ratio of selenium powder and sodium borohydride is 2:1, stir the mixture for 18 minutes, and place in a steam bath After further warming, 2-bromoethanol was injected into the solution under the protection of nitrogen. React at 50°C for 7h and cool to room temperature, extract, and use anhydrous Na 2 SO 4 dry. Purification by column chromatography affords diselenodiol.

[0035] Step 3: Under the protection of an inert gas, stir components A such as diselenide, organic bismuth cata...

Embodiment 3

[0038] Step 1: Under the protection of an inert gas, mix 10g of isophorone diisocyanate (IPDI) and 17.2g of trifunctional polypropylene glycol (Mn=6000) evenly, and react at 80°C for 3 hours to measure the - The content of NCO determines the end point of the reaction, and the obtained-NCO content is the terminal isocyanate prepolymer B component of 13%;

[0039] Step 2: Under magnetic stirring in an ice bath, add selenium powder to deionized water containing dissolved sodium borohydride, the molar ratio of selenium powder and sodium borohydride is 2:1, stir the mixture for 20 minutes, and place in a steam bath After further warming, 2-bromoethanol was injected into the solution under the protection of nitrogen. React at 50°C for 8h and cool to room temperature, extract, and use anhydrous Na 2 SO 4dry. Purification by column chromatography affords diselenodiol.

[0040] Step 3: Under the protection of an inert gas, stir components A such as diselenide, organic bismuth catal...

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Abstract

The invention discloses a preparation method of photoreversible self-healing solvent-free polyurethane synthetic leather bass containing a double selenium bond. Polyisocyanate is used as a component B, raw materials such as polyol and double selenium glycol are used as components A, and the self-healing solvent-free polyurethane synthetic leather bass containing the double selenium bond is synthesized. The preparation method specifically includes the following steps: (1) the polyol is prepared as a soft segment, prepolymer end capped by an isocyanate group and the double selenium glycol containing a dynamic covalent bond are prepared as a hard segment, and self-healing polyurethane containing the double selenium bond is prepared; and (2) the self-healing solvent-free polyurethane syntheticleather bass is prepared. According to the preparation method of the photoreversible self-healing solvent-free polyurethane synthetic leather bass containing the double selenium bond, self-healing solvent-free polyurethane synthetic leather is prepared by adjusting the components and proportions of hard and soft segments, the preparation method is novel, the obtained material has excellent performance, the high tensile strength and breaking elongation are achieved, and under mild light, raw materials can be repaired from damage in a short time; durability and reliability of the material are enhanced, the cost of the material can be lowered, and the service life of the material is prolonged.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, and in particular relates to a photoreversible solvent-free self-healing polyurethane composition, a synthetic leather base and a preparation method. Background technique [0002] A large amount of solvents are used in the processing of traditional solvent-based polyurethane synthetic leather, which endangers the health of processing workers and causes environmental pollution. Solvent residues in the finished product will affect the quality of the product and cause harm to users and the environment. It is easy to cause product safety problems. It can be replaced The development and research of solvent-based polyurethane has gradually become a hot spot, which has greatly promoted the development of solvent-free polyurethane. Solvent-free polyurethane does not involve the emission of solvents and VOC content, which is in line with relevant national policies. Based on the concept of green enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32D06N3/14
Inventor 罗晓民胡文杰冯见艳
Owner SHAANXI UNIV OF SCI & TECH
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