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Preparation method of solventless polyurethane containing disulfide bond and having dual self repair of hydrophobicity and mechanical properties

A solvent-free polyurethane and disulfide bond technology, which is applied in the field of polyurethane, can solve the problems of shortening the service life of materials, affecting material performance, and destroying the appearance of materials, etc., and achieves the effect of mild repair conditions, long solution time, and excellent mechanical properties

Inactive Publication Date: 2019-07-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The microphase separation structure of polyurethane makes polyurethane have better biocompatibility than other polymer materials. It is used in medical devices, construction and textiles. However, in practical applications, polyurethane products suffer from mechanical damage caused by friction, collision and bending. Damage will destroy the appearance of the material, affect the performance of the material, and ultimately shorten the service life of the material
At present, most traditional polyurethanes are solvent-based, the materials are not environmentally friendly, and the manufacturing process is not ecological, which is harmful to the health of industrial workers and the environment.

Method used

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  • Preparation method of solventless polyurethane containing disulfide bond and having dual self repair of hydrophobicity and mechanical properties
  • Preparation method of solventless polyurethane containing disulfide bond and having dual self repair of hydrophobicity and mechanical properties
  • Preparation method of solventless polyurethane containing disulfide bond and having dual self repair of hydrophobicity and mechanical properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Under the protection of an inert gas, mix two polyols (mass ratio 1:1) of isophorone diisocyanate, polyethylene adipate diol and polypropylene glycol (mass ratio 1:1) with a molar ratio of 2:1 , After reacting at 75°C for 1 hour, add a catalyst, and react for 2 hours to obtain a terminal isocyanate prepolymer;

[0033] Step 2: Under the protection of an inert gas, add hydroxyl-terminated fluorinated polysiloxane with a viscosity of 500cp to the prepolymer in the above 1), the dosage is 10% of the mass of polyisocyanate and polyol, and stir at 75°C After 1.5 hours, a polymer with fluorine-containing polysiloxane segments attached to the main chain was prepared.

[0034] Step 3: Under the protection of inert gas, add 2-hydroxyethyl disulfide to the prepolymer in the above 2), wherein the molar ratio of polyisocyanate, polyol and disulfide is 2:1:1, 75°C Stir the reaction for 0.5h. After the -NCO content is consumed, use Fourier transform infrared to detect it to ...

Embodiment 2

[0036] Step 1: Under the protection of an inert gas, mix two polyols (mass ratio 1:1) of isophorone diisocyanate, polyethylene adipate diol and polypropylene glycol (mass ratio 1:1) with a molar ratio of 2:1 , after reacting at 80°C for 1.5h, add a catalyst, and react for 2h to obtain a terminal isocyanate prepolymer;

[0037] Step 2: Under the protection of an inert gas, add hydroxyl-terminated fluorinated polysiloxane with a viscosity of 500cp to the prepolymer in the above 1), the dosage is 10% of the mass of polyisocyanate and polyol, and stir at 80°C 2h, to obtain a polymer with fluorine-containing polysiloxane segments attached to the main chain.

[0038] Step 3: Under the protection of inert gas, add 2-hydroxyethyl disulfide to the prepolymer in the above 2), wherein the molar ratio of polyisocyanate, polyol and disulfide is 2:1:1, 80°C Stir the reaction for 0.5h, and when the -NCO content is consumed, detect it with Fourier transform infrared to ensure the complete re...

Embodiment 3

[0040] Step 1: Under the protection of an inert gas, mix two polyols (mass ratio 1:1) of isophorone diisocyanate, polyethylene adipate diol and polypropylene glycol (mass ratio 1:1) with a molar ratio of 2:1 , After reacting at 85°C for 1.5h, add a catalyst, and react for 2.5h, to obtain a terminal isocyanate prepolymer;

[0041] Step 2: Under the protection of an inert gas, add hydroxyl-terminated fluorinated polysiloxane with a viscosity of 400cp to the prepolymer in the above 1), the dosage is 10% of the mass of polyisocyanate and polyol, and stir at 85°C After 2.5 hours, a polymer with fluorine-containing polysiloxane segments attached to the main chain was obtained.

[0042] Step 3: Under the protection of inert gas, add 2-hydroxyethyl disulfide to the prepolymer in the above 2), wherein the molar ratio of polyisocyanate, polyol and disulfide is 2:1:1, 85°C Stir the reaction for 1 hour, and when the -NCO content is consumed, detect it with Fourier transform infrared to e...

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Abstract

The invention discloses a preparation method of solventless polyurethane containing a disulfide bond and having dual self repair of hydrophobicity and mechanical properties. The method comprises the following steps: performing a reaction on a terminal isocyanate terminated prepolymer, hydroxyl terminated fluoropolysiloxane and a disulfide containing a dynamic covalent bond to synthesize the self-repair solventless polyurethane having low surface energy and containing the disulfide bond; and the dual self repair of hydrophobicity and mechanical properties of the material is realized based on three characteristics of a photoreversible reaction of the disulfide bond, promotion of self repair by a hydrogen bond and the low surface energy of fluorosilicone. The preparation method provided by the invention is novel, and has a simple process and high practicability, and the material prepared by the method has excellent hydrophobicity and mechanical properties; the fracture surface of the material can be repaired as before after heating or UV illumination for a certain period of time, and the repaired surface still has hydrophobicity; and the preparation method has high repair efficiency,can prolong the service life of the material, and has good application prospects.

Description

technical field [0001] The present invention relates to the technical field of polyurethane, in particular to a solvent-free polyurethane with double hydrophobicity and mechanical self-healing and a preparation method thereof. Background technique [0002] The microphase separation structure of polyurethane makes polyurethane have better biocompatibility than other polymer materials. It is used in medical devices, construction and textiles. However, in practical applications, polyurethane products suffer from mechanical damage caused by friction, collision and bending. Damage will destroy the appearance of the material, affect the performance of the material, and ultimately shorten the service life of the material. At present, most of the traditional polyurethanes are solvent-based, the materials are not environmentally friendly, and the manufacturing process is not ecological, which is harmful to the health of industrial workers and the environment. Therefore, the developm...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/12C08G18/40C08G18/42C08G18/48C08G18/32
CPCC08G18/12C08G18/4018C08G18/4238C08G18/4825C08G18/66C08G18/61C08G18/3855C08G18/3868
Inventor 罗晓民胡文杰冯见艳袁晨高同乐吴佳华董明倩
Owner SHAANXI UNIV OF SCI & TECH
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