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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

AI Technical Summary

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 properties under different wavelengths of ultraviolet light, and the material has good mechanical properties. The tensile strength reaches 26-28 MPa, and the elongation at break reaches 860-920%. However, this technology can only be repaired under specific wavelengths of ultraviolet light. Harsh conditions and defects with a maximum repair efficiency of only 70%

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

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Experimental program
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Effect test

Embodiment 1

[0038]A method for preparing a self-healing polyurethane elastomer based on multiple dynamic reversible actions, comprising the following process steps:

[0039] Step 1, mix and stir 4.44g isophorone diisocyanate (IPDI) and 20.00g polybutylene adipate (PBA) 2000 evenly, add 0.1g dibutyltin dilaurate in a water bath with a temperature of 80°C Heated and stirred for 4 hours to obtain a prepolymer;

[0040] Step 2: Add 1.24g of 4,4'-diaminodiphenyl disulfide (DTDA) into 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 boric acid into the prepolymer, stop heating and stir for 15min:

[0042] Step 4: After the product obtained in step 3 is mixed and stirred evenly, it is poured into a mold, vacuum defoamed, solidified and formed at 60°C, kept for 1d, and vacuum-dried at 80°C for 24h to constant weight to obtain a self- Repair polyurethane elastomers.

[0043] figure 1 A flow chart for pr...

Embodiment 2

[0048] A method for preparing a self-healing polyurethane elastomer based on multiple dynamic reversible actions, comprising the following process steps:

[0049] Step 1, 3.48g of toluene diisocyanate (TDI) and 20.00g of polybutylene adipate (PBA) 2000 were mixed and stirred evenly, and 0.05g of stannous octoate was added and heated and stirred in a water bath at a temperature of 70°C for 3 hours. get prepolymer;

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

[0051] Step 3, add 0.44g boric acid into the prepolymer, stop heating and stir for 10min:

[0052] Step 4: After the product obtained in step 3 is mixed and stirred evenly, it is poured into a mold, vacuum defoamed, solidified and formed at 60°C, kept for 1d, and vacuum-dried at 70°C for 16h to constant weight to obtain a self- Repair polyurethane elastomers.

Embodiment 3

[0054] A method for preparing a self-healing polyurethane elastomer based on multiple dynamic reversible actions, comprising the following process steps:

[0055] Step 1, mix 3.36g 1,6-hexamethylene diisocyanate (HDI) and 20.00g polybutylene adipate (PBA) 2000 and stir evenly, add 0.07g dibutyltin dilaurate at a temperature of 70°C heated and stirred in a water bath for 3 hours to obtain a prepolymer;

[0056] Step 2: Add 1.24g of 4,4'-diaminodiphenyl disulfide (DTDA) into 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 boric acid into the prepolymer, stop heating and stir for 10min:

[0058] Step 4: After the product obtained in step 3 is mixed and stirred evenly, it is poured into a mold, vacuum defoamed, solidified and formed at 60°C, kept for 1d, and vacuum-dried at 70°C for 16h to constant weight to obtain a self- Repair polyurethane elastomers.

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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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