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Method for improving bonding quality of foams and fabrics applied in liquid molding process

A liquid forming and bonding quality technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of foam and fabric layering, increase the difficulty of process implementation, and easy moisture absorption, etc., to achieve Improved bonding quality, strong adaptability, and the effect of solving technical bottlenecks

Active Publication Date: 2014-05-14
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foam slotting or opening puts forward higher requirements for foam processing, and the use of sutures increases the difficulty of process implementation, and sutures are generally made of organic fibers such as aramid fiber and nylon, which are prone to moisture absorption, which will cause foam and Fabric bonded layering
In practical applications, these methods have major problems, which limit the application of the liquid molding process with a sandwich structure in high-performance aerospace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: use a brush to apply the unsaturated polyester body on the lower surface of the polyurethane foam, and place the foam on the pre-laid EW220 glass cloth; After laying the EW220 glass cloth, it is encapsulated, injected, cured, and demoulded according to the original plan, and the bonding quality between the foam and the fabric is greatly improved.

Embodiment 2

[0024] Example 2: VARI molding foam sandwich structure composite material was manufactured by using VARI molding medium-temperature curing epoxy resin, G803 carbon fiber fabric, and polymethacrylimide (PMI) 51WF foam.

[0025] 1) Pre-polymerize the original VARI molding high-temperature curing epoxy resin at 80°C for 150 minutes, and apply and scrape 300g / m on the film machine 2 The resin film is ready for use;

[0026] 2) Heat the PMI 51WF foam to 125°C for 60 minutes to remove moisture and then cool it for use;

[0027] 3) Use tools such as an electric iron to evenly spread the prepared film on the PMI foam;

[0028] 4) Lay up, package, inject and solidify the treated PMI foam according to the original method.

[0029] The bonding quality of the foam and the fabric of the composite material manufactured by the method is good, and the non-destructive test is passed.

Embodiment 3

[0030] Example 3: VARI molding foam sandwich structure composite material was manufactured using VARI molding high temperature curing epoxy resin, glass fiber NCF fabric, polymethacrylimide (PMI) 71WF foam.

[0031] 1) Due to the low viscosity of the resin, it is not suitable for direct coating; and it is difficult to prepare the film by scraping on the film machine after prepolymerization. After analyzing and comparing the physical and chemical properties, choose SY-14C high temperature epoxy resin compatible with the original resin Membrane improvement;

[0032] 2) Heat the PMI 71WF foam to 125°C for 60 minutes to remove moisture and then cool it for use;

[0033] 3) Spread the SY-14C film evenly on the PMI foam with tools such as an electric iron;

[0034] 4) Lay up, package, inject and solidify the treated PMI foam according to the original method.

[0035] The non-destructive testing and anatomical analysis of the composite material produced by this method show that the...

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PUM

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Abstract

The invention belongs to the field of composite material preparation, and relates to a method for improving the bonding quality of foams and fabrics applied in a liquid molding process. The method is characterized in that aiming at the characteristic that the molding pressure of the liquid molding (vacuum auxiliary resin penetration) process is low, a method for physically coating molding resins or bonding resin adhesive films is adopted to improve the bonding quality of foam sandwich composite materials, especially certain special fabrics (such as non-buckling fabrics). In the process of implementing the method, no special treatment is required to be performed on foams, therefore, the method is strong in adaptability. In the method disclosed by the invention, an adhesive film for sticking is prepared through directly coating or pre-polymerizing resin bodies or resins compatible with the resin bodies on the surfaces of foams, therefore, the interface bonding quality of foam sandwich composite materials prepared by using a vacuum auxiliary resin penetration molding process is improved on the premise of not changing or slightly adjusting the parameters of the liquid molding (vacuum auxiliary resin penetration) process.

Description

technical field [0001] The invention belongs to the preparation technology of composite materials, and relates to a method suitable for liquid forming technology to improve the bonding quality of foam and fabric. Background technique [0002] In the new generation of aerospace vehicles, the proportion of fiber-reinforced resin-based composite materials in the structural weight has increased significantly, and the use of parts has become more extensive. However, the manufacturing cost of composite materials remains high. The use of liquid molding technology can effectively reduce cost. Vacuum-assisted resin infiltration molding process has great advantages for manufacturing various thin-walled composite parts of aerospace due to its fast molding speed, low requirements for equipment, and relatively low mold cost. , the applied thin-walled composite parts are usually sandwich structures. In the vacuum-assisted resin infiltration process, especially for some fabric forms (suc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B7/12B32B27/12
Inventor 李晔钟翔屿张连旺张明包建文陈祥宝
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS