Liquid phenolic-type cyanate resin suitable for RTM (resin transfer molding) process

A technology of phenolic cyanate and phenolic resin, which is applied in the field of liquid cyanate resin and can solve problems such as short gel time

Inactive Publication Date: 2013-01-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has the shortcomings of short gelation time of the monomer and the generation of smoke and gas

Method used

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  • Liquid phenolic-type cyanate resin suitable for RTM (resin transfer molding) process
  • Liquid phenolic-type cyanate resin suitable for RTM (resin transfer molding) process
  • Liquid phenolic-type cyanate resin suitable for RTM (resin transfer molding) process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] After melting 1636g of phenol, put it in a three-neck glass flask equipped with a thermometer, reflux condenser and stirring device, raise the temperature to 70°C and add 87g of dilute sulfuric acid (10%). 652g of formaldehyde (37% aqueous solution) was added in batches, and the temperature was raised to 90°C for 6 hours. Neutralize to neutral with 10% sodium hydroxide solution. After cooling to room temperature, the crude product of phenolic resin was obtained. The crude product was vacuum rotary evaporated from room temperature to 150°C until no phenol vapor was present, then cooled to room temperature to obtain a brown yellow phenolic resin.

[0034] The obtained phenolic resin had an average molecular weight of 310 and a melting point of 60°C.

Embodiment 2

[0036] Get 200g acetone and add in the three-neck glass flask of thermometer, reflux condenser and stirring device, cool to-10 ℃, get 50g cyanogen bromide and phenolic resin in 20g example 1 and dissolve in acetone. 40 g of triethylamine was gradually added dropwise, and after the dropwise addition was completed, the temperature was raised to 5°C for 2 hours of reaction. After standing for 1 h, the salt was removed by filtration, and the crude product was obtained after distilling off acetone. Extract the crude product with dichloromethane, wash the extract with 5% hydrochloric acid, and separate the organic phase; wash three times with deionized water, then dry with magnesium sulfate; filter and distill off the solvent to obtain a liquid cyanate resin.

[0037] Phenolic cyanate resin has an average molecular weight of 390, a viscosity of 600cP at 20°C, and a thermal curing temperature of 200-300°C.

Embodiment 3

[0039] Get 200g of acetone and add in the three-neck glass flask of thermometer, reflux condenser and stirring device, cool to-10 ℃, get 50g of cyanogen bromide and 30g of phenolic resin in example 1 and dissolve in acetone. 40 g of triethylamine was gradually added dropwise, and after the dropwise addition was completed, the temperature was raised to 5°C for 2 hours of reaction. After standing for 1 h, the salt was removed by filtration, and the crude product was obtained after evaporating acetone. Extract the crude product with dichloromethane, wash the extract with 5% hydrochloric acid, and separate the organic phase; wash three times with deionized water, then dry with magnesium sulfate; filter and distill off the solvent to obtain a liquid cyanate resin.

[0040] Phenolic cyanate resin has an average molecular weight of 380, a viscosity of 580cP at 20°C, and a thermal curing temperature of 200-300°C.

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Abstract

The invention discloses a liquid phenolic-type cyanate resin suitable for RTM (resin transfer molding) and a preparation method of the liquid phenolic-type cryanate resin. Thermoplastic phenolic resin with low molecular weight is taken as a matrix, and reacts with cyanogen bromide to prepare the liquid cyanate resin under base catalysis. A material with good heat resistance is obtained from the phenolic-type cyanate resin disclosed by the invention by thermocuring and catalytic curing, and the phenolic-type cyanate resin is suitable for being used as a heat-resistant composite material matrix resin.

Description

technical field [0001] The invention relates to a thermosetting phenolic cyanate resin suitable for molding at room temperature and a preparation method thereof. Specifically, a low-molecular-weight phenolic resin is prepared by acid-catalyzed polymerization, and then a liquid cyanate resin suitable for RTM molding is prepared under alkali catalysis resin. technical background [0002] Cyanate ester resins have important application prospects in the fields of aerospace and electronic materials, including flame retardant materials, rocket shell materials, flame retardant fibers, and carbon-carbon composite material matrices. Phenolic cyanate resin is one of the best high-temperature resin materials with the best ablation resistance. It has good heat resistance, mechanical properties, dielectric properties and good process performance [Li Wenfeng, Chen Chun, Wang Guojian. Phenolic cyanic acid Research and Application of Ester Resin. Materials Review. 2006, 6:46]. However, th...

Claims

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Application Information

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IPC IPC(8): C08G8/28
Inventor 朱海荣王明存
Owner BEIHANG UNIV
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