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A photoreversible hydrophobic self-healing solvent-free polyurethane and its preparation method

A solvent-free polyurethane and self-repairing technology, applied in the field of polyurethane, can solve the problems of undurable and self-cleaning performance of the coating, achieve excellent mechanical properties and hydrophobic properties, prolong the service life, and repair the effect of mild conditions

Active Publication Date: 2021-06-29
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 solvents used in the traditional preparation of polyurethane, undurable coating and poor self-cleaning performance, and the repair conditions are mild, and only need to be irradiated with visible light for a short period of time, avoiding the high temperature required for traditional self-repair , long-term and ultraviolet light and other strong stimulating conditions, the preparation method is fast, efficient and harmless

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Under the protection of inert gas, mix 10g of isophorone diisocyanate (IPDI) and 23.4g of polypropylene glycol (Mn=6000) evenly, and react at 65°C for 3h, measure the content of -NCO in the system to determine the reaction The end point, obtained-NCO content is the terminal isocyanate prepolymer of 10%;

[0027] Step 2: Under magnetic stirring in an ice bath, add selenium powder into 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 8h and cool to room temperature, extract, and use anhydrous Na 2 SO 4 dry. Purification by column chromatography affords diselenodiol.

[0028] Step 3: Under the protection of inert gas, add diselenediol and hydroxyl-terminated fluorinated polysiloxane to the prepolymer in the abov...

Embodiment 2

[0030] Step 1: Under the protection of inert gas, mix 10g of isophorone diisocyanate (IPDI) and 21.6g of polypropylene glycol (Mn=6000) evenly, and react at 75°C for 3h, measure the content of -NCO in the system to determine the reaction The end point, the prepared-NCO content is a terminal isocyanate prepolymer of 11%;

[0031] Step 2: Under magnetic stirring in an ice bath, add selenium powder into 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 8h and cool to room temperature, extract, and use anhydrous Na 2 SO 4 dry. Purification by column chromatography affords diselenodiol.

[0032] Step 3: Under the protection of an inert gas, add diselenide and hydroxyl-terminated fluoropolysiloxane to the prepolymer in the above 2...

Embodiment 3

[0034] Step 1: Under the protection of inert gas, mix 10g of isophorone diisocyanate (IPDI) and 19.3g of polypropylene glycol (Mn=6000) evenly, and react at 80°C for 3 hours, measure the content of -NCO in the system to determine the reaction At the end point, the obtained-NCO content is a terminal isocyanate prepolymer of 12%;

[0035] 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 4 dry. Purification by column chromatography affords diselenodiol.

[0036] Step 3: Under the protection of an inert gas, add diselenediol and hydroxyl-terminated fluoropolysiloxane to the prepolymer in the...

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Abstract

The invention discloses a preparation method of photoreversible hydrophobic self-healing solvent-free polyurethane based on double-selenium dynamic covalent bonds. The three substances of fluoropolysiloxane are reacted to synthesize a hydrophobic self-healing solvent-free polyurethane containing diselenium bonds with low surface energy. The material is based on the dynamic reversible characteristics of double selenium dynamic covalent bonds, low surface energy and hydrophobicity of rough structure; the invention prepares solvent-free polyurethane with hydrophobicity and self-healing by adjusting the composition and ratio of soft and hard segments , the preparation method is novel, the obtained material has excellent properties, and has high mechanical properties. Under mild light, the raw material can be repaired from damage in a short time, and the hydrophobic property will also be restored. It has dual mechanical and hydrophobic properties. The characteristics of repair can prolong the service life of the material, and can be applied in fields such as synthetic leather, packaging and building materials.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to a photoreversible hydrophobic self-healing solvent-free polyurethane and a preparation method thereof. Background technique [0002] Polyurethane resin can adjust the formula combination by changing the chemical structure and variety of raw materials to prepare products with various properties and uses, which are used in aviation, construction and textiles. Traditional solvent-based polyurethanes involve solvents in the process of preparation and use The release of harmful substances is harmful to health, which greatly promotes the research of solvent-free polyurethane. The production process of solvent-free polyurethane is simple, does not use any solvent, and has excellent properties such as high mechanical strength, wear resistance, aging resistance, good elasticity, and strong reworkability. , a viable alternative to solvent-based polyurethanes. These applied products a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C09D175/08C08G18/61C08G18/48C08G18/32
Inventor 罗晓民胡文杰冯见艳
Owner SHAANXI UNIV OF SCI & TECH
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