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Method for producing molded article and preform of molded article

A manufacturing method and technology of preforms, applied in the field of manufacture of molded products and preforms of molded products, can solve the problems of material infiltration and failure to obtain the target coating layer, etc., achieve excellent liquid repellency and high degree of design freedom Effect

Pending Publication Date: 2020-11-10
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, for the purpose of further reducing the weight of fiber-reinforced composite materials, a structure having predetermined mechanical properties and consisting of resin, reinforcing fibers, and voids has been proposed (see, for example, Patent Document 2). When a coating layer is provided on such a structure having continuous voids in the thickness direction for the purpose of stability, etc., there is a problem that the material constituting the coating layer penetrates and the target coating layer cannot be obtained.

Method used

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  • Method for producing molded article and preform of molded article
  • Method for producing molded article and preform of molded article
  • Method for producing molded article and preform of molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] As the above step (I), paint 1 is spray-coated three times on the surface of the precursor (a) of the porous body (A), and dried for 30 minutes to form a coating material 1 on the precursor (a). film layer (B) to obtain a preform. Table 1 shows the surface roughness Ra1 and adhesion of the film layer (B) of the obtained preform.

[0155] Next, a molded article is obtained by passing the preform through the following steps (II-1) to (II-5) as the above-mentioned step (II). Table 1 shows the characteristics of the molded article obtained in Example 1.

[0156] Step (II-1): The preform was placed in the cavity of a press molding mold preheated to 200° C., and the mold was closed.

[0157] Step (II-2): After maintaining for 120 seconds, a pressure of 3 MPa was applied and further maintained for 60 seconds.

[0158] Step (II-3): The cavity of the mold was opened, and a metal spacer was inserted at the end thereof to adjust so that the thickness of the molded product was 3...

Embodiment 2

[0162] The coating material 2 was spray-coated twice on the surface of the precursor (a) and dried for 1 hour to form a thin film layer (B) of the coating material 2 on the precursor (a) to obtain a preform. Table 1 shows the surface roughness Ra1 and adhesion of the film layer (B) of the obtained preform.

[0163] Next, the obtained preform was subjected to steps (II-1) to (II-5) in the same manner as in Example 1, thereby obtaining a molded article. Table 1 shows properties of the molded article obtained in Example 2.

Embodiment 3

[0165] Paint 3 was applied once on the surface of the precursor (a) using a roller, and dried in a dryer at a furnace temperature of 50°C for 1 hour to form a thin film of paint 3 on the precursor (a). layer (B) to obtain a preform. Table 1 shows the surface roughness Ra1 and adhesion of the film layer (B) of the obtained preform.

[0166] Next, the obtained preform was subjected to steps (II-1) to (II-5) in the same manner as in Example 1, thereby obtaining a molded article. Table 1 shows properties of the molded article obtained in Example 3.

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Abstract

Provided is a method for manufacturing molded articles having excellent stiffness and lightness, and improved design and liquid-repellency by means of a simple process. The present invention is a method for manufacturing the molded article in which a thin film layer (B) is formed on the surface of a porous body (A), and involves orderly performing the following steps (I)-(II) of obtaining a preform by forming the thin film layer (B) on the surface of a precursor (a) of the porous body (A) and expanding the precursor (a) to mold the precursor on the porous body (A).

Description

technical field [0001] The present invention relates to a method for producing a molded article excellent in designability and liquid repellency, and to a preform of the molded article. Background technique [0002] In recent years, fiber-reinforced composite materials obtained by compounding reinforcing fibers and matrix resins have been widely used in industrial products such as automobiles, aircraft, and sporting goods as structures with improved mechanical properties and light weight. Products using fiber-reinforced composite materials are coated by painting or the like for the purpose of imparting designability and liquid repellency. As a technique for forming a coating layer on a fiber-reinforced composite material, a technique has been proposed in which a preform in which a resin layer composed of a thermosetting resin and a solid additive is laminated on a prepreg layer is heated to The matrix resin and the thermosetting resin of the resin layer are cured to form a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B5/18B29B11/00B29C44/06B29C70/18B29C70/40B32B5/28C08J5/04C08J7/04C08J9/00C08J7/043C08J7/056
CPCB29B11/00B29C44/06B32B5/18B32B5/28C08J2323/12C08J2423/12C08J2400/22C08J2463/02C08J5/042C08J7/042C08J7/043C08J7/056B29C44/08B29C70/42B29C70/12B29C70/086C08J9/365C08J9/0085B29C70/18B29C70/40
Inventor 藤冈圣筱原光太郎本间雅登
Owner TORAY IND INC
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