Self-repairing polyurethane elastomer based on multiple dynamic reversible effects, and preparation method thereof

A polyurethane elastomer, self-healing technology, applied in the field of functional polyurethane, can solve problems such as harsh conditions, and achieve the effects of improving mechanical strength, high self-healing efficiency, and mild self-healing conditions

Active Publication Date: 2019-11-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Literature Chinese invention patent application CN109111562A discloses another self-healing polyurethane and its preparation method and self-healing method, using the principle of reversible dimer formation of 4-methylumbelliferone under the irradiation of ultraviolet light of different wavelengths so that the material can It has self-healing propertie

Method used

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  • Self-repairing polyurethane elastomer based on multiple dynamic reversible effects, and preparation method thereof
  • Self-repairing polyurethane elastomer based on multiple dynamic reversible effects, and preparation method thereof
  • Self-repairing polyurethane elastomer based on multiple dynamic reversible effects, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1

[0038] A preparation method of self-healing polyurethane elastomer based on multiple dynamic reversible effects, including the following process steps:

[0039] Step 1. Mix 4.44g isophorone diisocyanate (IPDI) and 20.00g polybutylene adipate (PBA) 2000 and stir evenly, add 0.1g dibutyltin dilaurate in a water bath at a temperature of 80℃ Heat and stir the reaction for 4h to obtain the prepolymer;

[0040] Step 2. Add 1.24g of 4,4'-diaminodiphenyl disulfide (DTDA) to the prepolymer, react at 80°C for 1 hour, and dilute with 10ml of acetone during this period to prevent gelation;

[0041] Step 3. Add 0.44g of boric acid to the prepolymer, and stir for 15 minutes with the heating stopped:

[0042] Step 4. After the product obtained in step 3 is evenly mixed and stirred, it is poured into a mold, vacuum degassed, cured at 60°C and molded, kept for 1 d, and dried in vacuum at 80°C for 24 hours to constant weight to obtain a self-contained product based on multiple dynamic...

Example Embodiment

[0047] Example 2

[0048] A preparation method of self-healing polyurethane elastomer based on multiple dynamic reversible effects, including the following process steps:

[0049] Step 1. Mix 3.48g of toluene diisocyanate (TDI) and 20.00g of polybutylene adipate (PBA) 2000 and stir uniformly, add 0.05g of stannous octoate and heat and stir in a water bath at 70°C for 3h. Get the prepolymer;

[0050] Step 2. Add 1.24g of 4,4'-diaminodiphenyl disulfide (DTDA) to the prepolymer, react at 70°C for 1 hour, and dilute with 10ml of N,N-dimethylacetamide during the period to prevent gelation;

[0051] Step 3. Add 0.44g of boric acid to the prepolymer, and stir for 10 minutes under stopping heating:

[0052] Step 4. After the product obtained in step 3 is mixed and stirred uniformly, it is poured into a mold, vacuum degassed, cured at 60°C, and molded, kept for 1 d, and dried in vacuum at 70°C for 16 hours to constant weight to obtain an autoclave based on multiple dynamic reversible effects. ...

Example Embodiment

[0053] Example 3

[0054] A preparation method of self-healing polyurethane elastomer based on multiple dynamic reversible effects, including the following process steps:

[0055] Step 1. Mix 3.36g of 1,6-hexamethylene diisocyanate (HDI) and 20.00g of polybutylene adipate (PBA) 2000 and stir evenly, add 0.07g of dibutyltin dilaurate at a temperature of 70℃ Heat and stir in the water bath for 3h to obtain the prepolymer;

[0056] Step 2. Add 1.24g of 4,4'-diaminodiphenyl disulfide (DTDA) to the prepolymer, react at 70°C for 1 hour, and dilute with 10ml of N,N-dimethylformamide during this period to prevent gelation;

[0057] Step 3. Add 0.44g of boric acid to the prepolymer, and stir for 10 minutes under stopping heating:

[0058] Step 4. After the product obtained in step 3 is evenly mixed and stirred, it is poured into a mold, vacuum degassed, cured at 60°C, and molded, kept for 1d, and dried in vacuum at 70°C for 16 hours to a constant weight to obtain a self-reversible effect based ...

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Abstract

The invention discloses a self-repairing polyurethane elastomer based on multiple dynamic reversible effects, and a preparation method thereof. The preparation method comprises: uniformly mixing and stirring diisocyanate and polyester diol, adding a catalyst, and carrying out a heating stirring reaction for 3-5 h in an oil bath with a temperature of 60-80 DEG C to obtain a prepolymer; adding a disulfide chain extender into the obtained prepolymer mixed solution, carrying out a heating stirring reaction for 0.5-1 h in an oil bath with a temperature of 60-80 DEG C, and adding a solvent to control the viscosity of the reactant so as to prevent gelling; and adding a cross-linking chain extender, carrying out a reaction, pouring into a mold, standing for 16-24 h at a temperature of 60-80 DEG C,and carrying out curing molding. According to the present invention, the obtained self-repairing polyurethane elastomer has the tensile strength of 23.3 MPa at the optimal self-repairing efficiency of 99%, and can be used as the structural material in the fields of vehicles, medical use, buildings, protective materials and the like.

Description

technical field [0001] The invention belongs to the field of functional polyurethane, in particular to a self-repairing polyurethane elastomer based on multiple dynamic reversible actions and a preparation method thereof. Background technique [0002] Self-healing polymer materials can spontaneously repair part or all of the internal and surface damages generated in the process of forming, processing and using, so as to eliminate the hidden dangers caused by material damage to a large extent and prolong the life of materials. Therefore, it has become a continuous hot spot in the research and development of polymer materials in the past ten years. The current research and development of self-healing polymer systems mainly focus on intrinsic self-healing polymer materials that rely on their own reversible chemical or physical actions for repair. Molecular segments are required to have good mobility (flexible molecular chains, low molecular weight, amorphous, weak cross-linkin...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/38
CPCC08G18/3868C08G18/3897C08G18/4238C08G18/6633
Inventor 卢珣盛叶明程波周佳辉秦锐
Owner SOUTH CHINA UNIV OF TECH
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