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Method for improving interlayer toughness of fiber reinforced resin matrix composites

A fiber-reinforced resin and composite material layer technology, which is applied in the field of fiber-reinforced resin-based composite material preparation, can solve problems such as unfavorable process, increased difficulty of process realization, increased viscosity of resin system, etc., and achieves improved comprehensive mechanical properties, interlayer Effects of increased shear strength and interlaminar fracture toughness

Inactive Publication Date: 2013-05-01
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the small size of the filler particles, especially the large specific surface area of ​​nanoparticles, they are easy to agglomerate in the resin matrix and difficult to disperse effectively, which increases the risk of defects in composite materials.
Therefore, in order to obtain better dispersion, it can only be filled with low content (nanoparticle filling content is generally <5wt%), and it is impossible to achieve both good dispersion and high content at the same time to give full play to the strengthening and toughening effect of nanoparticles.
Chinese patent CN101613944B reported a method for improving the impact resistance of carbon fiber reinforced resin-based composites by using liquid molding technology, but this patent directly added nanoparticles into the resin system, resulting in a sharp increase in the viscosity of the resin system, not only failing to achieve a high content of nanoparticles Filling, and it is also not conducive to the infiltration and filling process of the resin on the reinforcement during the production process
Chinese patent CN101284423B reports a method for preparing a carbon nanotube / carbon fiber multi-scale hybrid composite material using liquid forming technology, but this patent can only obtain a low content of carbon nanotubes, and uses electric field induction to prepare preforms and ultrasonic assistance The method of dispersing carbon nanotubes increases the difficulty of process realization, which is not conducive to the promotion and application of this patent achievement
However, it is still relatively difficult to prepare large-area, ultra-thin carbon nanotube non-woven fabrics by suction filtration, which is not conducive to matching with existing processes, and direct intercalation of carbon nanotube non-woven fabrics also increases production costs and product quality. weight, which restricts the popularization and application of this patent
[0005] In summary, the addition of nanoparticles can effectively improve the interlayer toughness of composite materials. From the analysis of the published literature, people's attention is mainly focused on the development of different types of nanoparticles, and how to There are few reports on improving the filling content of nanoparticles, and there is a lack of a universal preparation method

Method used

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  • Method for improving interlayer toughness of fiber reinforced resin matrix composites
  • Method for improving interlayer toughness of fiber reinforced resin matrix composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation of carbon nanotube / carbon fiber unidirectional fabric reinforced epoxy resin-based composite material

[0022] Put 1g of carbon nanotubes, 100ml of acetone, and 200g of epoxy bisphenol A resin in a beaker, and then use the JY92-IIDN ultrasonic continuous flow cell disruptor of Ningbo Xinzhi Biotechnology Co., Ltd. to perform ultrasonic dispersion treatment on it, with a power of 900 watts, stop stirring and ultrasonic after 1 hour, put the mixed solution on a rotary evaporator, remove acetone under reduced pressure, and the acetone obtained can be recycled. The polyamine curing agent is added according to the stoichiometric ratio, and the resin solution containing carbon nanotubes is evenly coated on the single-layer fiber fabric to ensure uniform coating. Then lay the carbon fiber unidirectional fabric into the mold cavity according to the number of layers and structure of the product design, to ensure that it fits tightly with each position of t...

Embodiment 2

[0024] Example 2: After the carbon nanotube / carbon fiber unidirectional fabric preform prepared in Example 1 is sealed and coated with a polytetrafluoroethylene filter membrane with a pore size of 0.45 μm, the molds are closed, and the vacuum-assisted resin transfer molding method is adopted The mold was filled and infiltrated with epoxy bisphenol A resin and polyamine curing agent system at 40°C, and finally cured at 120°C for 1 hour and 180°C for 2 hours. The resin content can be controlled between 20% and 50%, the interlaminar shear strength ILSS of the composite material can be increased by up to 36%, and the type II interlaminar fracture toughness G IIC The maximum increase is 65%.

Embodiment 3

[0025] Embodiment 3: preparation nano-SiO2 / glass fiber square cloth reinforced vinyl resin matrix composite material

[0026] Mix 5g of nano-SiO2 with 200g of vinyl resin and methyl ethyl ketone peroxide curing agent through a homogeneous mixer (Germany IKA-T65D), and evenly coat it on a single-layer glass fiber grid cloth, and then according to the number of layers designed for the product Prepare the preform with the structure to ensure that the preform is closely attached to each position of the cavity to prevent the layup from twisting and wrinkling. Then, a layer of cellulose filter membrane with a pore size of 0.025 μm is coated on the surface of the preform, which can be sealed and mold-closed with adhesive tape.

[0027] The reinforced fabric was then infiltrated a second time with a low-viscosity vinyl resin and methyl ethyl ketone peroxide curing agent system at room temperature by vacuum-assisted liquid transfer molding, and finally cured at 50°C for 3 hours. The ...

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Abstract

The invention relates to a method for improving interlayer toughness of fiber reinforced resin matrix composites. Dispersing low content nano particles into resin conducive to realize the homodisperse of nano particles; through encompassing a filtration film with specific pore diameter scale, scouring of resin towards the nano particles during liquid forming process is decreased; and meanwhile, a suction filtration effect is utilized to enable the particles to concentrate in the interlayers of the composites. The nano particles in resin system are concentrated from low concentration to high concentration, so that the discrepancy between nano particle dispersivity and high content is effectively solved, and the aim of improving the interlayer toughness of the fiber reinforced resin matrix composites is realized.

Description

technical field [0001] The invention relates to a preparation method of a fiber-reinforced resin-based composite material, in particular to a preparation method for improving interlayer toughness of a fiber-reinforced resin-based composite material through in-situ enrichment of nanoparticles, belonging to the technical field of advanced polymer-based composite material manufacturing . Background technique [0002] Fiber-reinforced resin-based composites are the most mature and widely used type of composite materials. This material is composed of chopped or continuous fibers and their fabrics and thermosetting or thermoplastic resin matrix. Because of the composite of heterogeneous materials, the performance of the interface between the fiber and the matrix will directly affect the final performance and function of the composite material. , which is also the focus and difficulty in this field to be solved urgently. In order to improve the interfacial properties of fiber-rei...

Claims

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Application Information

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IPC IPC(8): B29C70/46
Inventor 吴立新马林卓东贤翁子骧
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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