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High temperature-resistant epoxy resin for composite material prepreg, and synthesis technology thereof

An epoxy resin and composite material technology, applied in the field of composite materials, can solve the problems of low temperature resin fluidity not as good as epoxy resin, double horse resin, long curing time, low temperature, etc., to achieve high impact toughness and short curing time , good infiltration effect

Active Publication Date: 2019-08-16
汉硕高新材料(天津)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current epoxy resin system for prepregs takes a long time to cure, and the use temperature is lower than 250°C. For the use of composite materials in an environment exceeding 250°C, the existing epoxy resin can no longer meet the requirements.
In the use of high temperature resistant composite material prepreg resin, bismaleimide resin is usually selected as the main substrate of the resin, but the curing time of bismaleimide resin is long and the process is complicated, and the flow of low temperature resin Not as strong as epoxy resin
[0004] Trisphenolyl methane triglycidyl ether is mostly used in adhesives due to its high viscosity and high temperature resistance, such as a Chinese invention patent - a high temperature resistant flame retardant epoxy adhesive (CN 104726045B); It is used in the field of prepreg, but because of its high viscosity and poor impregnation with fibers, the amount added does not exceed 20% of the total resin, and the temperature resistance of the obtained resin does not exceed 250°C

Method used

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  • High temperature-resistant epoxy resin for composite material prepreg, and synthesis technology thereof
  • High temperature-resistant epoxy resin for composite material prepreg, and synthesis technology thereof
  • High temperature-resistant epoxy resin for composite material prepreg, and synthesis technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]45g of trisphenol-based methane triglycidyl ether, 65g of triglycidyl p-aminophenol, 35g of o-cresol novolac epoxy resin with an epoxy value of 0.45 and 30g of modified polyethersulfone were mixed and dissolved at 120°C to obtain A transparent and uniform mixture, then mix the above epoxy resin with 25g of thermoplastic polyimide resin 5218 and 50g of curing agent 4,4-diaminodiphenylsulfone in a high-speed mixer, the stirring temperature is 80°C, and the stirring speed is 3000r / min, so that the curing agent and the like are uniformly dispersed in the epoxy resin to obtain the epoxy resin composition described in the invention.

[0040] Take a small amount of Example 1 to obtain the epoxy resin composition, and use a rotational rheometer to test its rheological properties at elevated temperature. Other compositions are vacuum degassed and poured into PTFE molds. Put the mold in an oven to cure at 150°C for 1 hour, then at 180°C for 3 hours, and at 250°C for 1-3 hours. S...

Embodiment 2

[0042] Contrast resin 6360

[0043] Mix 65g of triglycidyl p-aminophenol and 35g of o-cresol novolac epoxy resin with an epoxy value of 0.45 and stir and dissolve at 120°C to obtain a transparent and uniform mixture, then add 25g of the above epoxy resin to curing agent 4,4 - Diaminodiphenyl sulfone was stirred and mixed in a high-speed mixer, the stirring temperature was 80°C, and the stirring speed was 3000r / min, so that the curing agent and the like were uniformly dispersed in the epoxy resin, and the comparative resin 6360 was obtained. Put the mold in an oven to cure at 150°C for 1 hour, then at 180°C for 3 hours, and at 250°C for 1-3 hours.

Embodiment 3

[0045] Double Horse Resin

[0046] N,N'-4,4'-diphenyl-bismaleimide 35g (component A), N,N'-2,6-toluene-bismaleimide 30g (component B) , 2,2'-diallyl bisphenol A35g (component C), thermoplastic toughening agent 20g,

[0047] Put A, B, and C into the reaction kettle, stir evenly, vacuumize and heat to 110°C, keep warm for about 10 minutes, until the three components are completely melted, then cool to 80°C, add D component to the cooled Heat the temperature to 90°C in the mixture, keep the mixture at 80°C to 90°C for 15 minutes (with vacuum), and then cool to room temperature to obtain bis-horse resin. Curing: 4 hours at 190°C, 16 hours at 230°C.

[0048] Rheological properties and performance test methods of cured products are as follows:

[0049] The rheological test adopts the Discovery HR-2 rheometer of TA Company, and tests in the air environment, the test temperature range is 60-200 degrees, the heating rate is 5 °C / min, and the shear rate is 2s-1.

[0050] The glass t...

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Abstract

A high temperature-resistant high toughness epoxy resin for a composite material prepreg is obtained by mixing and heating 20-70 wt% of an epoxy resin, 10-30 wt% of a toughening agent and 10-40 wt% ofa curing agent; and the viscosity of the high temperature-resistant high toughness epoxy resin obtained by mixing and heating above materials at 50-75 DEG C is 16000-25000 mPa.S, and the glass transition temperature Tg (DMA) is greater than 330 DEG C. The glass transition temperature of the high temperature-resistant resin prepared from an epoxy resin matrix is greater than 300 DEG C, so the heatresistance of the resin is excellent; the epoxy resin has a low curing temperature and a short curing time, so reduction of the production cost is reduced; the obtained resin and fibers can be well infiltrated, so the obtained prepreg has excellent performances; and the composite material has excellent mechanical properties and a high impact toughness.

Description

technical field [0001] The invention belongs to the field of composite materials, in particular to carbon fiber or glass fiber composite materials, in particular to an epoxy resin used for composite material prepregs and a synthesis process. Background technique [0002] Prepreg (prepreg) is a fiber-reinforced composite manufactured by combining fibers and a matrix whose main component is resin. Carbon fiber-reinforced composites containing carbon fibers and resins are excellent in mechanical properties and are widely used in general industrial applications such as sporting goods, aircraft, and automobiles. These carbon fiber reinforced composites form prepregs by aligning the filaments of carbon fibers and impregnating thermosetting resins in the carbon fibers with alignment properties such as woven carbon cross and connected carbon filaments. Fiber-reinforced plastics (FRP) with excellent mechanical properties and stiffness can be manufactured by laminating and forming pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L61/04C08L81/06
CPCC08L63/00C08L2205/035C08L2205/025C08L2201/08C08L61/04C08L81/06
Inventor 周易辛媛
Owner 汉硕高新材料(天津)有限公司
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