Modified benzoxazine resin capable of using for RTM and process for preparing same

A technology of benzoxazine and resin, which is applied in the field of modified benzoxazine resin and its preparation, can solve problems such as difficult RTM process, and achieve the effects of improving crosslinking density, excellent physical and mechanical properties, and low hygroscopicity

Inactive Publication Date: 2003-10-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing benzoxazine intermediates all use resin solution or solid powder to form composite products, which is difficult to use in RTM process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031]1. With phenol 47.0g, aniline 46.5g, formaldehyde aqueous solution (37%) 81.1g, sodium hydroxide solution (10%) 3ml, add in the reactor that has thermometer, agitator and reflux condenser, at temperature 80 ℃ After 5 hours of reflux reaction, the temperature was lowered, and the layers were separated. The upper layer of water was separated, and the lower layer of liquid was vacuum extracted to remove the solvent to obtain a light yellow viscous benzoxazine intermediate. The liquid intermediate has a viscosity of 180 cp at a temperature of 50° C., and the viscosity does not change after a constant temperature of 50° C. for 2 hours, and a viscosity of 150 cp after a constant temperature of 80° C. for 5 hours.

[0032] 2. with diphenylmethanediamine 49.5g, formaldehyde aqueous solution (37%) 81.1g, phenol 47.0g, sodium hydroxide (10%) 3ml, ethanol 35ml, toluene 88ml, add in the same equipment of embodiment 1, at temperature After reflux reaction at 80°C for 5 hours, the tem...

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Abstract

A modified benzoxazine resin able to be used for RTM is prepared through feeding low-voscosity benzoxazine intermediate and epoxy resin (or arylacetylene resin) proportionally into a reactor, mixing,reaction at 50-100 deg.C for 5-10 min, adding catalyst, and reaction for 5-10 min. It can also be prepared from low-viscosity benzoxazine intermediate and bimaleimide resin.

Description

1. Technical field [0001] The invention relates to a modified benzoxazine resin which can be used for resin transfer molding (Resin Transfer Molding, RTM) molding and a preparation method thereof, belonging to the field of fiber-reinforced resin-based composite materials and processing. 2. Background technology [0002] The RTM process is a resin-based composite material processing technology developed rapidly in the 1990s. Its basic process is: inject a liquid low-viscosity, solvent-free thermosetting resin into the mold cavity, and impregnate the reinforcement pre-fixed in the mold cavity. The material is preformed, cured at a certain temperature, and processed into a product after demoulding. The RTM process is easy to control the content and structure of reinforcing fibers, the product surface quality is good, the dimensional accuracy is high, and the mechanical properties are outstanding. It can produce high-performance large-scale parts with complex shapes, high produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/06
Inventor 顾宜向海王劲凌鸿朱蓉琪盛兆碧
Owner SICHUAN UNIV
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