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Aromatic polyimine thermosetting resin and preparation method thereof

A thermosetting and polyimine technology, applied in the field of thermosetting resins, can solve the problems of difficult recycling of composite materials, inability to melt and plasticize, waste of resources, etc., and achieve controllable and adjustable reaction process, good hydrophobicity, and mild preparation reaction conditions Effect

Active Publication Date: 2018-10-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with thermoplastic resins, thermosetting resins generally form prepolymers first, and the potential functional groups in them continue to react to form a crosslinked structure and solidify during molding. This transformation is irreversible. It cannot be melted and plasticized when heated, and it is also insoluble. Composite materials are difficult to recycle
Waste is usually used as filler, landfill or incineration, which not only causes a huge waste of resources, but also brings serious environmental pollution
Therefore, the problem that composite materials are difficult to recycle needs to be solved urgently

Method used

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  • Aromatic polyimine thermosetting resin and preparation method thereof
  • Aromatic polyimine thermosetting resin and preparation method thereof
  • Aromatic polyimine thermosetting resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 80mmol tris[(4-formylphenoxy)-methyl]ethane and 120mmol 4,4'-bis(4-aminophenoxy)diphenyl sulfone into 250ml N-methylpyrrolidone solvent, in Stir and react at 60°C for 1 hour, then coat the reaction pre-polymerization solution on a horizontal glass plate, and dry at 120°C for 1 hour to obtain a sheet-like material. Put multiple sheets of material into a mold for hot pressing under the conditions of 180°C and 5MPa to obtain polyimide resin sheets with different thicknesses. The tensile strength, Young's modulus and elongation at break of the resin are 118Mpa, 3.5Gpa and 7% respectively, and the bending strength and modulus reach 138MPa and 3.1Gpa respectively. The glass transition temperature is 155°C, the 5wt% thermal decomposition temperature is 430°C, and the contact angle with water is 103°. Add 30g of resin to 200ml of N-methylpyrrolidone dissolved in 17.5g of 4,4'-bis(4-aminophenoxy)diphenyl sulfone, place it at 60°C for 6h, the resin is completely dissolved, t...

Embodiment 2

[0035] Add 80 mmol tris[(4-formylphenoxy)-methyl]ethane and 120 mmol 2,2'-bis[4-(4-aminophenoxyphenyl)]propane to 300 ml dimethyl sulfoxide In a solvent, stir and react at 90°C for 0.1h, then coat the reaction prepolymer on a horizontal glass plate, and dry at 120°C for 1h to obtain a sheet-like material. Put multiple sheets of material into a mold for hot pressing under the conditions of 220°C and 15MPa to obtain polyimide resin sheets with different thicknesses. The tensile strength, Young's modulus and elongation at break of the resin are 95Mpa, 3.3Gpa and 11% respectively, and the bending strength and modulus reach 124MPa and 2.9Gpa respectively. The glass transition temperature is 221°C, the thermal decomposition temperature of 5wt% is 440°C, the contact angle with water is 95°, and the water absorption rate is 0.2wt%. Add 30g of resin to 200ml of dimethyl sulfoxide dissolved in 21g of 2,2'-bis[4-(4-aminophenoxyphenyl)]propane, place it at 40°C for 36h, the resin is comp...

Embodiment 3

[0037] Add 80mmol tris[(4-formylphenoxy)-methyl]ethane and 120mmol 2,2'-bis[4-(4-aminophenoxyphenyl)]propane into 600ml ethanol solvent, Stir and react at 50°C for 1.5h, a yellow precipitate precipitated at the bottom, filter, and dry at 120°C for 2h to obtain a yellow powder. The powder is evenly added into the mold for hot pressing under the conditions of 220°C and 10MPa to obtain polyimide resin plates with different thicknesses. The tensile strength, Young's modulus and elongation at break of the resin are 93Mpa, 3.2Gpa and 10.7% respectively, and the bending strength and modulus reach 122MPa and 2.8Gpa respectively. The glass transition temperature is 213°C, the thermal decomposition temperature of 5wt% is 436°C, the contact angle with water is 95°, and the water absorption rate is 0.2wt%. Add 30g of resin to 200ml of ethanol dissolved in 21g of 2,2'-bis[4-(4-aminophenoxyphenyl)]propane, place it at 50°C for 12h, the resin is completely dissolved, then add 14.8g of tris[...

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Abstract

The invention discloses aromatic polyimine thermosetting resin and a preparation method thereof. The preparation method comprises the following steps: 1) uniformly dissolving an aromatic aldehyde andan aromatic amine in an aprotic solvent, and stirring for reaction at 20 to 100 DEG C for 0.05 to 5 hours to obtain a prepolymer precipitate or a prepolymer solution; 2) filtering and drying the prepolymer precipitate or drying the prepolymer solution, then placing the prepolymer solution in a mold for hot press forming at 150 to 250 DEG C under 1 to 20 MPa to obtain the thermosetting resin havinga structural formula of formula I, wherein R1 and R2 are benzene ring-containing aromatic structures. The thermosetting resin has excellent mechanical properties, heat resistance and hydrophobic properties, the preparation method has the advantages of simple process, adjustable controllable reaction process and high yield, and the obtained resin can be recycled and reused, and is suitable for expanding production.

Description

technical field [0001] The invention relates to the field of thermosetting resins, in particular to an aromatic polyimide thermosetting resin and a preparation method thereof. Background technique [0002] Carbon fiber reinforced epoxy resin-based composites have the characteristics of high specific strength and specific stiffness, good corrosion resistance, and stable structural dimensions. They have been widely used in high-tech fields such as aerospace, wind power, and transportation. However, compared with thermoplastic resins, thermosetting resins generally form prepolymers first, and the potential functional groups in them continue to react to form a cross-linked structure and solidify during molding. This transformation is irreversible. Composites are difficult to recycle. Waste is usually used as filler, landfill or incineration, which not only causes a huge waste of resources, but also brings serious environmental pollution. Therefore, the problem that composite m...

Claims

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Application Information

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IPC IPC(8): C08G12/08C08J11/08C08L61/22
CPCC08G12/08C08J11/08C08J2361/22Y02W30/62
Inventor 袁彦超贾雷赵建青刘述梅
Owner SOUTH CHINA UNIV OF TECH
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