Methods for synthesizing, recycling and reprocessing recyclable shape memory thermosetting resin

A thermosetting and memory technology, which is applied in the field of new polymer material synthesis, can solve the problems of harshness, weak reversibility, rare and expensive raw material recovery conditions, etc., and achieve the effects of excellent mechanical properties, cheap and easy-to-obtain reagents, and excellent tensile modulus

Active Publication Date: 2021-03-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these materials have no practical application value due to rare and expensive raw materials or harsh recycling conditions.
[0004] Polyurethane material, usually refers to the polyurethane material (PU) prepared based on the reaction of alcohol hydroxyl group and isocyanate, because of its excellent mechanical properties, weather resistance and dimensional stability, it has become a material widely used in aerospace, electronics, construction and many other fields , however, the weak reversibility of the urethane bond limits the reprocessing performance of polyurethane materials, and basically does not have recycling performance

Method used

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  • Methods for synthesizing, recycling and reprocessing recyclable shape memory thermosetting resin
  • Methods for synthesizing, recycling and reprocessing recyclable shape memory thermosetting resin
  • Methods for synthesizing, recycling and reprocessing recyclable shape memory thermosetting resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Trimethylolpropane tris(3-mercaptopropionate) is used as polythiol, 1,3-bis(1-isocyanato-1-methylethyl)benzene is used as dibasic isocyanate, and N,N - Diisopropylethylamine as a catalyst as an example.

[0058] A recyclable shape-memory polythiourethane thermosetting resin comprising trimethylolpropane tris(3-mercaptopropionate) and 1,3-bis(1-isocyanato-1-methylethyl ) The reaction product of benzene component, the structure of described polythiourethane is:

[0059]

[0060] The synthetic method of above-mentioned recyclable shape-memory polythiourethane thermosetting resin comprises the steps:

[0061] Add 20.84 g of trimethylolpropane tris(3-mercaptopropionate) and 19.16 g of 1,3-bis(1-isocyanato-1-methylethyl)benzene into a beaker equipped with a stirring bar , after mixing evenly, add 40 mg of N,N-diisopropylethylamine and stir evenly, pour the mixture into a polytetrafluoroethylene mold, react at room temperature for 2 hours, and peel the material from the m...

Embodiment 2

[0063] Use trimethylolpropane tris(3-mercaptopropionate) as polythiol, 4,4'-dicyclohexylmethane diisocyanate as diisocyanate, and N,N-diisopropylethylamine as catalyst as an example.

[0064] A recyclable shape-memory polythiourethane thermosetting resin, which is a reaction product comprising trimethylolpropane tris(3-mercaptopropionate) and 4,4'-dicyclohexylmethane diisocyanate components, the The structure of polythiourethane is:

[0065]

[0066] The synthetic method of above-mentioned recyclable shape-memory polythiourethane thermosetting resin comprises the steps:

[0067] Add 31.88g of trimethylolpropane tris(3-mercaptopropionate) and 31.48g of 4,4'-dicyclohexylmethane diisocyanate into a beaker equipped with a stirring bar, mix well, then add 63mg of N , Stir N-diisopropylethylamine evenly, pour the mixture into a polytetrafluoroethylene mold, react at room temperature for 2 hours, peel the material from the mold, and obtain high-strength, colorless and transparen...

Embodiment 3

[0069] Trimethylolpropane tris(3-mercaptopropionate) is used as polythiol, isophorone diisocyanate is used as dibasic isocyanate, and N,N-diisopropylethylamine is used as a catalyst.

[0070] A recyclable shape-memory polythiourethane thermosetting resin, which is a reaction product comprising trimethylolpropane tris (3-mercaptopropionate) and isophorone diisocyanate components, the polythiourethane The structure is:

[0071]

[0072] The synthetic method of above-mentioned recyclable shape-memory polythiourethane thermosetting resin comprises the steps:

[0073] Add 20.84g of trimethylolpropane tris(3-mercaptopropionate) and 17.44g of isophorone diisocyanate into a beaker equipped with a stirring bar. After mixing evenly, add 38mg of N,N-diisocyanate Stir the propylethylamine evenly, pour the mixed solution into a polytetrafluoroethylene mold, react at room temperature for 2 hours, and peel the material from the mold to obtain a high-strength, colorless and transparent sh...

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Abstract

The invention discloses methods for synthesizing, recycling and reprocessing recyclable shape memory polythiourethane thermosetting resin. The polythiourethane thermosetting resin is mainly prepared from mercaptan and isocyanate as main raw materials, and the recycling reprocessing is realized by utilizing the dynamics of thiocarbamate bonds in the polythiourethane thermosetting resin. The synthesis method comprises the following steps: uniformly mixing mercaptan, isocyanate and a catalyst according to a certain molar ratio, and conducting reacting at room temperature for 1-3 hours to obtain the high-strength colorless transparent shape memory polythiourethane thermosetting resin. The recycling and reprocessing method comprises the following steps: putting the prepared polythiourethane material into chloroform, adding excessive mercaptan to dissolve the material to form a transparent and uniform solution, then adding isocyanate for reaction to form a gel, and conducting crushing, drying and hot-pressing to realize recycling and reprocessing of the material, or subjecting the prepared polythionocarbamate material to crushing and hot pressing, so as to achieve material recycling andreprocessing.

Description

technical field [0001] The application belongs to the field of synthesis of new polymer materials, and in particular relates to a method for synthesizing, recycling and reprocessing a high-strength, high-transparency, and recyclable shape-memory polythiourethane thermosetting resin. Background technique [0002] Thermosetting resins have excellent mechanical properties, solvent resistance and thermal stability due to their highly covalent cross-linking, and are widely used in many fields such as aerospace, medical treatment and transportation. However, unlike thermoplastic resins that can be reprocessed, thermosetting plastics are usually hard to be injected or reprocessed after being cured in a mold, so that the thermosetting resin material cannot be reused after deformation or damage, causing great harm. environmental pollution. [0003] In recent years, efforts have been made to develop various methods for the recovery and reuse of chemically crosslinked thermosetting re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/76C08G18/38
CPCC08G18/7642C08G18/758C08G18/755C08G18/3876
Inventor 张彦峰崔晨晖陈兴幸马丽钟倩云
Owner XI AN JIAOTONG UNIV
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