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

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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 i

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

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Example Embodiment

[0032] Example 1

[0033] 80mmol of tris[(4-aldehyde phenoxy)-methyl]ethane and 120mmol of 4,4'-bis(4-aminophenoxy)diphenyl sulfone were added to 250ml of N-methylpyrrolidone solvent, in The reaction was stirred at 60° C. for 1 hour, and then the reaction prepolymerization solution was coated on a horizontal glass plate, and dried at 120° C. for 1 hour to obtain a sheet-like material. Put a plurality of sheet materials into a mold for hot pressing, and the conditions are 180° C. and 5 MPa to obtain polyimide resin sheets of different thicknesses. The tensile strength, Young's modulus and elongation at break of the resin are 118Mpa, 3.5Gpa and 7%, respectively, and the flexural strength and modulus are 138MPa and 3.1Gpa, respectively. The glass transition temperature was 155°C, the 5 wt% thermal decomposition temperature was 430°C, and the contact angle with water was 103°. 30g of resin was added to 200ml of N-methylpyrrolidone in which 17.5g of 4,4'-bis(4-aminophenoxy)diphen...

Example Embodiment

[0034] Example 2

[0035] 80 mmol of tris[(4-aldophenoxy)-methyl]ethane and 120 mmol of 2,2'-bis[4-(4-aminophenoxyphenyl)]propane were added to 300 ml of dimethylsulfoxide In the solvent, the reaction was stirred at 90° C. for 0.1 h, and then the reaction prepolymerization solution was coated on a horizontal glass plate, and dried at 120° C. for 1 h to obtain a sheet-like material. Put a plurality of sheet materials into a mold for hot pressing, and the conditions are 220° C. and 15 MPa to obtain polyimide resin sheets of different thicknesses. The tensile strength, Young's modulus and elongation at break of the resin are 95Mpa, 3.3Gpa and 11%, respectively, and the flexural 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%. 30g resin was added to 21g 2,2'-bis[4-(4-aminophenoxyphenyl)]propane...

Example Embodiment

[0036] Example 3

[0037] 80mmol of tris[(4-aldehyde phenoxy)-methyl]ethane and 120mmol of 2,2'-bis[4-(4-aminophenoxyphenyl)]propane were added to 600ml of ethanol solvent, in The reaction was stirred at 50 °C for 1.5 h, and a yellow precipitate was precipitated at the bottom, filtered, and dried at 120 °C for 2 h to obtain a yellow powder. The powder is uniformly added into the mold for hot pressing, and the conditions are 220° C. and 10 MPa to obtain polyimide resin sheets of 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 flexural strength and modulus reach 122MPa and 2.8Gpa, respectively. The glass transition temperature was 213°C, the thermal decomposition temperature of 5wt% was 436°C, the contact angle with water was 95°, and the water absorption rate was 0.2wt%. 30g of resin was added to 21g of 2,2'-bis[4-(4-aminophenoxyphenyl)]propane dissolved in 200ml of ethanol, p...

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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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