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Epoxy resin for prepreg, prepreg, fiber-reinforced composite material, and processes for producing these

A composite material and fiber-reinforced technology, which is applied in the field of short-time manufacturing by compression molding, can solve the problems of FRP mechanical properties, deterioration of appearance, and heavy grinding work, and achieve easy manufacturing, superior mechanical properties, high The effect of mechanical properties

Inactive Publication Date: 2007-04-11
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] 1) The above-mentioned grinding operations are labor intensive;
[0023] 2) Continuous reinforcing fibers will also be worn off during grinding, thereby further reducing the mechanical and functional physical properties of the above-mentioned outer plate
Therefore, there is a problem that it cannot be applied to outer panels such as automobile outer panels that need to be matched with other parts because the value of the entire product will be lowered.
Then, not only the appearance will be deteriorated due to the coil bending of the surface part, but also the mechanical properties of FRP will be reduced because the internal coil bending will be caused by the disordered arrangement of the reinforcing fibers in this part.
Therefore, the production of FRP by compression molding is limited to the case of using SMC or the like disclosed in JP-A-10-95048

Method used

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  • Epoxy resin for prepreg, prepreg, fiber-reinforced composite material, and processes for producing these
  • Epoxy resin for prepreg, prepreg, fiber-reinforced composite material, and processes for producing these
  • Epoxy resin for prepreg, prepreg, fiber-reinforced composite material, and processes for producing these

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0323] The composition ratio shown in Table 1 was mixed until uniform, and the epoxy resin composition was prepared. With a simple roller coater, the mass of resin per unit area is 33.7g / m 2 This epoxy resin composition is uniformly coated on release paper to form a resin layer. Attach the resin layer to 125g / m 2 After aligning both sides of a sheet-like object formed by aligning carbon fiber (TR50S, tensile modulus of elasticity: 240GPa) made by Mitsubishi Rayon Co., Ltd. in one direction, it is heated with a roller at 100°C and a linear pressure of 2kg / cm And pressurizing, so that the epoxy resin composition is impregnated into the carbon fiber, and the mass per unit area of ​​the fiber is 125g / m 2 (The resin content is 35% by mass) prepreg.

[0324] The gel time at 130°C and the usable period of the prepregs obtained from the epoxy resin compositions of Examples 1 to 10 were evaluated. As a result, the gel time was less than or equal to 200 seconds. Adhesiveness can be maintain...

Embodiment 11～20

[0327] Except for mixing to be uniform at the composition ratio shown in Table 2, the prepreg was produced in the same manner as in Example 1, and evaluated.

[0328] The prepregs obtained from the epoxy resin compositions of Examples 11 to 20 also had a gel time of 200 seconds or less, and a usable period of 21 days or more could be confirmed.

[0329] The physical properties of flat composite materials (FRP sheet physical properties) are also the same, with 0° bending strength exceeding 160kg / mm 2 , 90° bending strength exceeds 10kg / mm 2 , Showing good physical properties.

Embodiment 21

[0331] In the composition shown in Example 21 of Table 3, the epoxy resin of component B and the amine component (DDS) were mixed at room temperature, and then heated at 150°C to partially react to prepare a viscosity of 30 to 90 at 90°C. Poise (component B-2). This reactant, A component, and C, D component were mixed in the composition ratio shown in Example 21 of Table 3 until uniform, and the epoxy resin composition was prepared. With a simple roller coater, the mass of resin per unit area is 33.7g / m 2 This epoxy resin composition is uniformly coated on release paper to form a resin layer. Attach the resin layer to 125g / m 2 After aligning both sides of a sheet-like object formed by aligning carbon fiber (TR50S, tensile modulus of elasticity: 240GPa) made by Mitsubishi Rayon Co., Ltd. in one direction, it is heated with a roller at 100°C and a linear pressure of 2kg / cm And pressurizing, so that the epoxy resin composition is impregnated into the carbon fiber, and the mass per un...

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Abstract

The present invention provides an excellent method capable of producing a fiber-reinforced composite material molded article having high strength and excellent appearance in a short period of time using a compression molding method. The manufacturing method of the fiber-reinforced composite molded article includes the steps of: adjusting the temperature of the forming mold to the curing temperature of the thermosetting resin or higher; A step of forming a substantially continuous reinforcing fiber impregnated with a thermosetting resin (surface area S1 on one side); followed by a step of closing the forming mold to fill the entire interior of the forming mold with the forming material; compression molding so that S1 / S2 is 0.8 to 1 A step of.

Description

[0001] This application is a Chinese patent application whose original application date is November 28, 2003, the application number is 2003800104284.9, and the invention title is "Epoxy resin for prepreg, prepreg, fiber-reinforced composite material and its manufacturing method" Divisional application. Technical field [0002] The invention relates to an epoxy resin composition, a thermosetting resin composition, a prepreg, a fiber-reinforced composite material, and a manufacturing method thereof. The epoxy resin of the present application is an epoxy resin composition particularly suitable for prepregs, and can be cured in a short time at a relatively low temperature. As a result, it can be used to obtain an excellent prepreg that has excellent mechanical properties and can be stored for a long time at room temperature. Furthermore, the thermosetting resin composition of the present invention is suitable for high-speed molding, and can exhibit high mechanical properties with resp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/02B29C43/52B29C43/32B29C43/36B29C70/40C08L63/00C08K7/00C08J5/24B29K105/06
Inventor 高野恒男柳濑明正酒井正沼田喜春伊藤彰浩田口真仁村松纯一后藤和也古贺一城
Owner MITSUBISHI CHEM CORP