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Composite material liquid state forming method with superlong open time

A liquid forming and composite material technology, which is applied in the field of continuous fiber reinforced resin matrix composite material forming technology, can solve the problems of high cost of freezing storage, difficult liquid forming process, short pot life, etc., and achieves rapid viscosity increase and increased process. Cost, quick response

Active Publication Date: 2018-06-12
ACC BEIJING SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the fiber volume fraction, the higher the mechanical properties of the liquid-formed composite material, but the greater the difficulty of the liquid-formed process. Therefore, how to manufacture composite materials with low porosity and other defects under the premise of ensuring a high fiber volume fraction Part becomes another limitation of liquid forming technology
[0005] In addition, once the two-component liquid molding resin is mixed, its pot life is generally very short, and the cost of frozen storage is high, which is also a disadvantage of this resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composite material reinforced with carbon fiber plain weave fabric was prepared by RTM closed mold process, and the fiber volume content was 48%. The resin is a mixed resin of E51 and bisphenol F epoxy resin, the curing agent is rosin-based anhydride, and the accelerator is a complex of boron trichloride ethylamine. The area of ​​the composite laminate was prepared to be 30cm×30cm, using 9 layers of carbon cloth, and the amount of rosin anhydride was calculated according to the mass content of the resin in the composite material to be 33g.

[0029] a. Dissolve rosin anhydride in 150ml of 3% sizing agent solution (the solvent is acetone), and after fully stirring, spray it on a carbon cloth with a total area of ​​about 0.81m2. After the solvent is completely volatilized, cut it into a piece of cloth with an area of ​​30cm×30cm There are 9 floors in total.

[0030] b. Lay the cut cloth according to the warp direction and seal it in the RTM mold. Check the tightness ...

Embodiment 2

[0036] The carbon fiber plain weave fabric-reinforced composite material was prepared by the RTM process, and the basic situation was the same as in Example 1, but the fiber volume content was increased to 54.8%. The resin is still a mixed resin of E51 and bisphenol F epoxy resin, the curing agent is rosin-based anhydride, and the accelerator is a complex of boron trichloride ethylamine. The area of ​​the composite laminate was prepared to be 30cm×30cm, using 10 layers of carbon cloth, and the amount of rosin anhydride was calculated according to the mass content of the resin in the composite material to be 28g.

[0037] Dissolve rosin anhydride in 150ml of 3% fixative solution (solvent is acetone), stir well and spray on the total area of ​​about 0.9m 2 After the solvent is completely volatilized, it is cut into 10 layers of cloth with an area of ​​30cm×30cm. All the other steps are as described in Example 1.

[0038] The cured sample has a good appearance, smooth and flat....

Embodiment 3

[0041] Continue to use the RTM process to prepare carbon fiber plain weave fabric reinforced composites, but the fiber volume content is further increased to 60.3%. The resin is a mixed resin of E51 and bisphenol F epoxy resin, the curing agent is rosin-based anhydride, and the accelerator is a complex of boron trichloride ethylamine. The area of ​​the composite laminate was prepared to be 30cm×30cm, using 11 layers of carbon cloth, and the amount of rosin anhydride was calculated according to the mass content of the resin in the composite material to be 24g.

[0042] The rosin anhydride powder is uniformly deposited on a total area of ​​about 0.99m by a fluidized bed method 2 Then use a focused infrared lamp to gradually scan and heat to about 200°C, let the rosin anhydride powder melt and adhere to the surface of the reinforced fabric, and then cut the surface-loaded fabric into a cloth piece with an area of ​​30cm×30cm, a total of 11 layers .

[0043] Subsequent processin...

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Abstract

The invention belongs to a continuous fiber reinforced resin-based composite material forming technology, and relates to a composite material liquid state forming method with the superlong open time.The method comprises the steps that one of reaction components in a resin system is loaded to a fiber prefabricated body in advance, resin and other components are subjected to injection molding in aflowing mode to fill a die on non-reaction conditions, and after die filling succeeds, conditions are changed to cause curing reaction of the reaction components. Compared with the characteristic thatresin viscosity is gradually increased along with time in the die filling process since die filling and curing reaction are carried out synchronously in the in-situ resin transfer molding technology,the technology is off site, resin die filling and curing reaction are separated, and the two processes do not interfere with each other or affect each other. The liquid state molding resin in the technology has no storage period limit in principle and also has no technology open period time limit, and the technology is particularly applicable to machining molding with the composite product fabrichigh body content and long injection molding period.

Description

technical field [0001] The invention belongs to continuous fiber-reinforced resin-based composite material molding technology, and relates to a composite material liquid molding technology with an ultra-long process opening period. Background technique [0002] In the field of molding and processing of continuous fiber reinforced resin matrix composites, liquid molding (Liquid Molding) is recognized as an advanced low-cost manufacturing technology at home and abroad, and it is also a high-efficiency composite molding technology that has developed rapidly in recent years. Liquid molding technology mainly includes vacuum resin suction molding (Vacuum Assistant ResinInfusion, VARI) and resin transfer molding (Resin Transfer Molding, RTM) Large and complex components, and maintain high structural design efficiency, thereby saving manufacturing costs and improving production efficiency. The weight of the composite material parts manufactured by the liquid forming method can cove...

Claims

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Application Information

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IPC IPC(8): B29C70/42B29C70/54
CPCB29C70/42B29C70/54
Inventor 益小苏张旭锋张元晋仝建峰黎迪辉
Owner ACC BEIJING SCI & TECH CO LTD
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