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Preparation method and application of fiber-reinforced thermoplastic composite material

A technology of fiber reinforcement and composite materials, applied in the field of composite materials, to achieve the effects of avoiding aging and rust, good aging resistance, and improving stiffness

Active Publication Date: 2012-11-14
株洲时代工程塑料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above three methods of preparing fiber-reinforced thermoplastic composites can obtain composite materials with higher stiffness, but due to the safety problems of railway fastener system components, they have higher requirements for the stiffness of materials, which limits the fiber-reinforced thermoplastic composites. Application of thermoplastic composites in railway fastening system components

Method used

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  • Preparation method and application of fiber-reinforced thermoplastic composite material
  • Preparation method and application of fiber-reinforced thermoplastic composite material
  • Preparation method and application of fiber-reinforced thermoplastic composite material

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preparation example Construction

[0022] The embodiment of the present invention discloses a preparation method of a fiber-reinforced thermoplastic composite material, comprising the following steps:

[0023] impregnating the fiber in a melt including thermoplastic resin to obtain a prepreg tape;

[0024] The prepreg tape is braided to obtain a fiber-reinforced thermoplastic composite material.

[0025] According to the present invention, in the process of preparing the fiber-reinforced thermoplastic composite material, a prepreg tape is firstly prepared. The prepreg tape is a prepreg tape in which fibers are impregnated in resin. In order to bond well with the resin, the fibers are preferably surface-treated, so that the fibers are dispersed in the resin at the level of monofilaments, so as to bond well with the resin. The surface treatment agent for the fiber surface treatment preferably includes but not limited to one or more of silanes, titanates, aluminates, organic chromium complexes, phosphoric acid e...

Embodiment 1

[0039] After 45wt% of the glass fiber is treated with a titanate surface treatment agent, it enters a preheating oven at 140°C for preheating, and at the same time, 55wt% of the polypropylene resin is plasticized in the extruder, and the heating temperature of the extruder is At 180°C, the polypropylene resin is plasticized and extruded to the die through the extruder. The preheated glass fiber enters the die with a fiber dispersion device. The temperature of the die is 230°C. In the die, the glass fiber is Dispersed and fully impregnated with polypropylene resin; after the fully impregnated glass fiber leaves the die, it is rolled into a pre-impregnated tape by the pressing roller group. Under the traction of the traction motor, the pre-impregnated tape enters the braiding machine at 0° and 90° Orthogonal weaving is carried out in the direction, and a sheet material with a two-dimensional or three-dimensional orientation structure is woven to obtain a fiber-reinforced thermopl...

Embodiment 2

[0041] After 50wt% of the glass fiber is treated with an aluminate surface treatment agent, it enters a preheating oven at 160°C for preheating, and at the same time, 50wt% of the nylon 6 resin is plasticized in the extruder, and the heating temperature of the extruder is 200°C, Nylon 6 resin is plasticized and extruded to the die through the extruder. The preheated glass fiber enters the die with a fiber dispersion device. The temperature of the die is 260°C. In the die, the glass fiber is Dispersed and fully impregnated with nylon 6 resin; after the fully impregnated glass fiber leaves the die, it is rolled into a pre-impregnated tape by a roller group, and under the traction of the traction motor, the pre-impregnated tape enters the weaving machine for weaving, and is woven into two A sheet with a one-dimensional or three-dimensional orientation structure is obtained to obtain a fiber-reinforced thermoplastic composite material, and the traction speed of the traction motor i...

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Abstract

The invention provides a preparation method of a fiber-reinforced thermoplastic composite material, which comprises the following steps: impregnating fibers in a melt containing a thermoplastic resin, thereby obtaining a preimpregnated belt; and knitting the preimpregnated belt to obtain the fiber-reinforced thermoplastic composite material. The continuous-fiber-reinforced thermoplastic composite material is formed by a knitting technique to obtain the composite material in a three-dimensional structure, so that the composite material has high rigidity in both horizontal and longitudinal directions, thereby greatly enhancing the rigidity of the thermoplastic composite material. The invention also provides application of the fiber-reinforced thermoplastic composite material in preparing railway fastener system components. The experimental result indicates that the tensile strength of the fiber-reinforced thermoplastic composite material is 450-690 MPa, the tensile modulus is 25000-36000 MPa, the bending strength is 780-850 MPa, and the bending modulus is 25000-40000 MPa.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation method and application of fiber-reinforced thermoplastic composite materials. Background technique [0002] With the development of industry and the acceleration of people's life rhythm, high-speed rail, subway and light rail have become indispensable means of transportation for people to travel. Due to the continuous increase of train speed, the requirements for the strength and stiffness of railway fastener system components continue to increase. The strength and rigidity to meet the requirements of the track structure. [0003] Railway fastener system components include backing plate, gauge baffle, embedded seat, embedded casing, insulating gauge block, height adjustment backing plate and other parts. Many parts of the railway fastener system in the prior art are processed by metal, such as QT450-10 steel is often used in the preparation of the back...

Claims

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Application Information

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IPC IPC(8): C08J5/06C08L23/12C08L23/06C08L59/00C08L67/00C08L77/00C08L71/12C08L71/08C08K7/06C08K3/04C08K7/14C08K7/10
Inventor 黄安民张伟张瑜李旭武邓凯桓
Owner 株洲时代工程塑料科技有限责任公司
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