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Prefabricated fabric for liquid condition shaping composite material and preparation thereof

A composite material and liquid forming technology, which is applied in the field of composite material manufacturing, can solve the problems affecting the combination and non-existence of the fiber-matrix interface, and achieve the effect of small impact and reduced usage

Active Publication Date: 2008-07-16
BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This prefabrication method commonly used today has several drawbacks: (1) residual solvents in the preform may introduce defects in the final product; (2) the surface of the reinforcing fibers is usually optimized for the resin matrix to improve interface properties , and after the fiber surface is covered with a sizing agent, it may affect the combination of the fiber-matrix interface; (3) Even if a non-solvent dry powder is used for sizing, there are still distribution forms, distribution states, and layers of the sizing agent on the surface of the fabric. However, there is no unified understanding and technical solutions to these problems at home and abroad at present.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Prefabricated fabric for liquid condition shaping composite material and preparation thereof
  • Prefabricated fabric for liquid condition shaping composite material and preparation thereof

Examples

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preparation example Construction

[0027] The method for preparing a prefabricated fabric for liquid forming composite materials as described above is characterized in that the preparation steps are as follows:

[0028] 1. Adhesion and toughening layer;

[0029] 1.1. Prepare the precursor material of the toughening layer, prepare the toughening component in the form of glue, powder, film, hot melt adhesive or fabric, and exist independently or attached to the lining paper or lining cloth.

[0030] 1.2. Adhering the toughening layer precursor material to one or both surfaces of the base fiber fabric, the method adopted is: the glue is coated with a solution; the powder is coated with hot-melt coating or powder coating; the film is composited with film; The hot-melt adhesive adopts hot-melt coating or hot-press transfer; the fabric adopts fabric compounding or hot-melt coating to form a continuous toughening layer or a discrete toughening layer with a certain pattern.

[0031] 2. Adhesive shaping layer;

[0032] ...

Embodiment 1

[0036] Preparation of the toughening layer: Polyethersulfone (PES) was dissolved in tetrahydrofuran (THF) to prepare a 5% solution. On the solution scraping film machine, evenly scrape the PES solution onto the backing paper, and obtain a toughened film after the solvent evaporates. Adjust the height of the knife edge of the scraping film to control the surface density of the toughened film to 20g / m 2 . Trimming and winding to obtain a continuous PES film with a width of about 900mm.

[0037] Place the SW280 plain glass fabric on the stainless steel conveyor belt, and the PES film is unwound and adsorbed on the upper surface of the glass fabric. The fabric covered with PES film moves forward and passes under the THF spraying device. After being dissolved by THF, the PES film closely adheres to the surface of the glass fabric and shrinks as the solvent volatilizes, leaving a gap between adjacent glass strands. out of the gap. After the solvent is volatilized, it is wound up...

Embodiment 2

[0041] Preparation of toughening layer: Add polyetherimide (PEI) resin powder into water dissolved with emulsifier and thickener to prepare a slurry with a viscosity of about 10 000 cPoise and a solid content of about 35%. The slurry is coated on the G827 unidirectional carbon fiber fabric through a rotary screen engraved with a specified pattern on the slurry point coating machine, and passed through a high-temperature oven at 380 ° C to melt and bond the PEI powder on the surface of the carbon fiber fabric. By designing the pattern of the rotary screen, the surface density of the sizing agent is controlled to 10g / m 2 . So far, the compounding of the toughening layer is completed. (A typical toughening layer pattern is shown in Figure 3).

[0042] Preparation of the shaping layer: carboxy-terminated nitrile rubber (CTBN) particles and AG80 epoxy resin were mixed in a weight ratio of 5:100, and then cryogenically frozen and pulverized to make shaping agent particles. On the...

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Abstract

The invention belongs to a composite material manufacturing technology which relates to a liquid molding prefabrication fabric and a preparation method thereof. The prefabrication fabric of the invention comprises a basal fiber fabric and is characterized in that: a toughening layer is adhered on one surface or two surfaces of the basal fiber fabric. The preparation method of the invention includes the steps: the toughening layer is conglutinated; a molding layer is conglutinated. The prefabrication fabric of the invention has both the interlayer selectivity toughening and molding functions, and realizes the high toughness modification of the composite material while keeping the composite material liquid molding performance and the good fabric prefabrication molding performance.

Description

technical field [0001] The invention belongs to composite material manufacturing technology, and relates to a prefabricated fabric for liquid forming and a preparation method thereof. Background technique [0002] High performance and low cost have become the main direction of composite material development. In terms of low-cost technology for composite materials, liquid molding technology represented by technologies such as resin transfer molding (RTM) and resin film infiltration (RFI) is one of the mainstream low-cost technologies for advanced composite materials. The main advantage of RTM or RFI is the ability to manufacture parts with complex configurations with high fiber volume content and maintain high structural design efficiency. For example, on the US F-22 aircraft, about 360 load-bearing structures accounting for about 45% of the weight of the non-skin composite structure were manufactured with RTM technology, achieving a weight reduction of 40% and a cost reduct...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): D06N7/00D06N3/00D06Q1/00B32B33/00
Inventor 益小苏安学锋张明唐邦铭马宏毅刘刚
Owner BEIJING AVIATION MATERIAL INST NO 1 GRP CORP CHINA AVIATION IND
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