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Method for modifying cyanate ester resin by hydroxyl-terminated polybutadiene

A technology of hydroxyl-terminated polybutadiene and cyanate resin, which is applied in the field of modified cyanate resin with hydroxyl-terminated polybutadiene, can solve the problem that the toughness of cyanate resin has not been improved, and the toughness of cyanate resin has not been improved. Obtain fundamental improvement and other problems, achieve good comprehensive mechanical properties, improve curing process, and maintain the effect of thermal stability

Inactive Publication Date: 2010-09-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent 200610029669.9 proposes a method of modifying cyanate resin with polytetrafluoroethylene to improve the dielectric properties and mechanical properties of the system; although the strength of the cyanate resin is improved in this method, the Resilience has not been fundamentally improved
Chinese invention patent 200610096622.4 proposes a preparation method of cyanate resin / carbon fiber composite material to improve the mechanical properties and flame retardant properties of the system; although the mechanical properties and flame retardant properties of the cyanate resin have been improved by this method, but Cyanate resin toughness has not been improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: In a reactor equipped with stirring, add 9g of bisphenol A cyanate resin and 1g of high cis-hydroxyl-terminated polybutadiene with a number average molecular weight of 2000, heat to 110°C, melt and stir to mix evenly . The DSC reaction peak temperature of the resin system is 260°C (20°C / min heating rate, nitrogen atmosphere); the modified resin system is pre-polymerized at 110°C for 30min, and placed in an oven according to 130°C / 2h+150°C / 2h +180°C / 2h + 200°C / 2h curing process, so that the modified cyanate resin with excellent performance can be obtained. The impact strength of cast body is 6.8kJ / m 2 , The initial temperature of thermal decomposition is 405°C.

Embodiment 2

[0015] Example 2: In a reactor equipped with stirring, add 8 g of bisphenol E cyanate resin and 2 g of low cis-terminated hydroxyl polybutadiene with a number average molecular weight of 3000, heat to 110 ° C, melt, stir and mix evenly . The DSC reaction peak temperature of the resin system is 265°C (20°C / min heating rate, nitrogen atmosphere); the modified resin system is pre-polymerized at 110°C for 10 minutes, and placed in an oven according to 130°C / 2h+150°C / 2h +180°C / 2h + 200°C / 2h curing process, so that the modified cyanate resin with excellent performance can be obtained. The impact strength of cast body is 7.3kJ / m 2 , The initial temperature of thermal decomposition is 390°C.

Embodiment 3

[0016] Example 3: In a reactor equipped with stirring, add 7 g of tetramethyl bisphenol F type cyanate resin and 3 g of high vinyl type hydroxyl-terminated polybutadiene with a number average molecular weight of 5000, heat to 120 ° C, Melt and stir to mix well. The DSC reaction peak temperature of the resin system is 289°C (20°C / min heating rate, nitrogen atmosphere); the resin system is pre-polymerized at 120°C for 60 minutes, and placed in an oven according to 130°C / 2h+150°C / 2h+180 ℃ / 2h+200℃ / 2h curing process, thus can obtain the modified cyanate resin with excellent performance. The impact strength of cast body is 8.5kJ / m 2 , The initial temperature of thermal decomposition is 384°C.

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Abstract

The invention relates to a method for modifying cyanate ester resin by hydroxyl-terminated polybutadiene, which comprises the following steps: adding hydroxyl-terminated polybutadiene rubber into the cyanate ester resin with the addition quantity of 5 to 30 weight percent; heating and melting the mixture to be uniformly mixed; heating the mixture to 120+ / -15DEG C for pre-polymerization for 10 to 60 min; carrying out casting and curing; uniformly heating at 130 to 200 DEG C for 7 to 10h for curing; and obtaining the modified cyanate ester resin with good performance. The modified system improves the curing process of the resin system, reduces the curing temperature of the resin system, shortens of the curing time, reduces the manufacture cost of the materials, the impact toughness of the cured modified cyanate ester resin is obviously improved, and the thermal stability is maintained. Because the modification system has good compatibility, the modification system does not need solvents, and the invention belongs to a direct method with the advantages of no pollution and simple operation.

Description

technical field [0001] The invention relates to a method for modifying cyanate resin with hydroxyl-terminated polybutadiene, which can improve the toughness of cyanate resin, maintain the thermal stability of cyanate resin, and improve the use of the resin system in high-frequency and high-speed aerospace electronics. Comprehensive performance in many fields such as printed circuit boards of equipment, aerospace structural components, stealth materials, high-performance radome and communication satellites. Background technique [0002] Cyanate resin is a new type of resin with great potential. Under the action of heating or catalyst, it can undergo cyclotrimerization reaction to generate a large number of triazine ring structures. High glass transition temperature, high heat resistance; triazine ring structure has high cross-linking density, high crystallinity, low polarity, low water absorption, and low hygroscopicity; it can form chemical bonds with hydroxyl groups on the ...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08L79/04C08L9/00C08L15/00
Inventor 胡柏星马万翔刘靖王薇薇
Owner NANJING UNIV
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