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Impact-resistant epoxy resin-based glass fiber composite high in interlaminar fracture toughness

An epoxy resin matrix and epoxy resin technology, which is applied in the field of high-rise fracture toughness and impact-resistant epoxy resin-based glass fiber composite materials, can solve the problems of poor impact resistance and low interlayer toughness of composite materials, and achieve excellent impact resistance. The effect of performance, simple and easy operation process, good interlaminar fracture toughness and impact resistance

Inactive Publication Date: 2018-08-28
AVIC BASIC TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of low toughness of the above-mentioned dicyandiamide cured epoxy system leading to low interlayer toughness and poor impact resistance of the composite material, and provides a high-toughness impact-resistant epoxy / dicyandiamide resin composition and its composite material preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 90 parts by mass of bisphenol A type liquid epoxy resin D.E.R.331, 10 parts by mass of bisphenol A type solid epoxy resin D.E.R.662, 6 parts by mass of dicyandiamide, 4 parts by mass of 4,4 -di(N,N-dimethyl)urea diphenylmethane, 4 parts by mass of nano-rubber particles, dried at 100°C for 3 hours, to remove moisture and volatiles therein; under stirring conditions, the solid epoxy ring Add epoxy resin to liquid epoxy resin, heat at 120°C for 30 minutes, until the solid epoxy resin is completely dissolved to obtain component G, add nano-rubber particles into component G in proportion, and use the three-roll method to complete the powder rubber in the ring. Dispersion in oxygen resin yielded a translucent composition H. Add the curing agent and the accelerator to the composition H according to the proportion. After preliminary mixing, stir and disperse for 40 minutes to fully mix the components to obtain a high toughness and impact resistant epoxy resin system 1.

[0034...

Embodiment 2

[0037] 80 parts by mass of bisphenol A type liquid epoxy resin D.E.R.331, 5 parts by mass of glycidylamine epoxy resin AG-80, 15 parts by mass of bisphenol A type solid epoxy resin D.E.R.662, 8 parts by mass Parts of dicyandiamide, 2 parts by mass of 4,4-bis(N,N-dimethyl)diphenylmethane urea, 6 parts by mass of nano-rubber particles, dried at 105°C for 3h, and removed Moisture and volatile matter; under stirring conditions, add the solid epoxy epoxy resin to the liquid epoxy resin, at 120°C for 40 minutes until the solid epoxy resin is completely dissolved to obtain component G, and add nano-rubber particles into the group according to the proportion In part G, the dispersion of the powdered rubber in the epoxy resin was accomplished using the three-roll method, resulting in a translucent composition H. Add the curing agent and the accelerator to the composition H according to the proportion. After preliminary mixing, stir and disperse for 10 minutes to fully mix the component...

Embodiment 3

[0041] With the bisphenol A type liquid epoxy resin E-54 of 80 parts by mass, the glycidylamine epoxy resin AG-80 of 10 parts by mass, the bisphenol A type solid epoxy resin CYD-017 of 10 parts by mass, 5 parts by mass of dicyandiamide, 3 parts by mass of 3-(4-chlorophenyl)-1,1-dimethylurea, 8 parts by mass of nano-rubber particles, dried at 95°C for 4h, removed The moisture and volatile matter in it; under the condition of stirring, add the solid epoxy epoxy resin into the liquid epoxy resin, 25min at 140°C until the solid epoxy resin is completely dissolved to obtain component G, and add the nano-rubber particles in proportion Into component G, the dispersion of powder rubber in epoxy resin was completed by three-roll method, and a translucent composition H was obtained. Add the curing agent and the accelerator to the composition H according to the proportion. After preliminary mixing, stir and disperse for 20 minutes to fully mix the components to obtain a high-toughness an...

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Abstract

The invention belongs to the technical fields of high-performance epoxy resin and application of high-performance epoxy resin composites, and relates to an impact-resistant epoxy resin-based glass fiber composite high in interlaminar fracture toughness. The impact-resistant epoxy resin-based glass fiber composite comprises, by mass, 60-100 parts of liquid epoxy resin, 0-40 parts of solid epoxy resin, 2-15 parts of nanometer rubber particles, 1.0-12 parts of dicyandiamide curing agent and 0.5-6 parts of accelerator. Epoxy resin is prepared through shearing, dispersion and mixing, the impact strength of the system is 31 kJ / m<2> or above, the highest impact strength can reach 50 kJ / m<2> or above, and the epoxy resin composite is high in impact toughness. The epoxy resin / glass fiber compositeprepared from the epoxy resin system is high in interlaminar toughness and impact resistance, the mode I interlaminar fracture toughness can reach 1706 J / m<2> or above, and compared with a common epoxy resin / glass fiber composite, the mode I interlaminar fracture toughness is increased by 60%; the compression strength of the epoxy resin / glass fiber composite obtained after impact can reach 260 MPaor above, and compared with the common epoxy resin / glass fiber composite, the compression strength is increased by 62%.

Description

technical field [0001] The invention belongs to the technical field of application of high-performance epoxy resin and its composite material, and relates to an epoxy resin-based glass fiber composite material with fracture toughness and impact resistance between high layers. Background technique [0002] Epoxy resin is an epoxy oligomer containing more than two epoxy groups in one molecule, which can form a three-dimensional crosslinked network thermosetting material when it reacts with a curing agent. Epoxy resin has good mechanical properties, electrical properties, corrosion resistance and processability, and is widely used in various fields such as coatings, electrical insulation materials, adhesives and composite materials. Dicyandiamide is a commonly used latent curing agent for epoxy resin, with good stability, long storage period, and good use. It is a commonly used curing agent for epoxy resin and its composite materials. However, the dicyandiamide epoxy resin cur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L21/00C08K7/14C08G59/56C08G59/40C08J5/04
CPCC08G59/4021C08G59/56C08J5/043C08J2363/00C08L63/00C08L2201/10C08L2205/025C08L2205/03C08L21/00C08K7/14
Inventor 李亚锋洪旭辉邢丽英陈祥宝
Owner AVIC BASIC TECH RES INST
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