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Porous fiber-reinforced composite and method for preparing same

A technology of fiber reinforcement and composite materials, applied in textiles, papermaking, non-woven fabrics, etc., can solve problems such as restrictions and reduced dispersion

Inactive Publication Date: 2017-12-01
LG HAUSYS LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when introducing a process of producing a reinforcing fiber mat through a wet or dry process, there is a limit to improving the strength by modifying the reinforcing fiber, so it is not necessary to optimize the production process of the conventional powder or short fiber type Modification of thermoplastic resins
In addition, in the case of ordinary thermoplastic resins, they are chemically hydrophobic or have a specific gravity lighter than water, so in the process of forming a felt, the dispersibility is significantly reduced, so it is difficult to apply fibrous thermoplastic resins to wet papermaking processes

Method used

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  • Porous fiber-reinforced composite and method for preparing same
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  • Porous fiber-reinforced composite and method for preparing same

Examples

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preparation example Construction

[0066] In another example of the present invention, a method for preparing a porous fiber-reinforced composite material is provided. The method for preparing the porous fiber-reinforced composite material includes: dispersing reinforcing fibers and bicomponent polymer fibers in an acidic aqueous solution to prepare a step of a size solution; a step of forming a web using the above-mentioned size solution through a wet papermaking process; and a step of heat-treating and drying the formed above-mentioned web.

[0067] The above-mentioned porous fiber-reinforced composite material can be produced by the above-mentioned method for producing a porous fiber-reinforced composite material.

[0068] figure 2 A case where the porous fiber-reinforced composite material 20 is produced by applying heat and pressure to the reinforcing fibers 4 and the bicomponent polymer fibers 5 by the above-mentioned method for producing the porous fiber-reinforced composite material is shown.

[0069]...

Embodiment 1

[0104] As a bicomponent polymer fiber, a fiber in which the polyester core and the low-melting point polyester sheath have a weight ratio of 50:50, the fiber having a length of 5 mm and a thickness of 4 denier ( denier) (section diameter of about 20 μm) to ensure water dispersibility. As the glass fiber, a coated glass fiber with a cross-sectional diameter of 13 μm was cut to a length of 13 mm, and prepared so as to be suitable for water dispersion. 40 parts by weight of the above-mentioned glass fiber and 60 parts by weight of the above-mentioned bicomponent polymer fiber were blended, and stirred for 1 hour in an aqueous solution whose pH was adjusted to 2 with hydrochloric acid. At this time, the fiber total amount of the glass fiber and the bicomponent polymer fiber was 2 g per 1 L of water. The wet papermaking process is performed so that the aqueous slurry thus subjected to the stirring process is formed into a web in a headbox by a vacuum suction device. After the web...

Embodiment 2

[0106] In the same manner as in Example 1, the glass fibers used in Example 1 were replaced with glass fibers that were specially coated with silane on the surface to improve the bonding force with the polyester resin. After preparing a thin sheet of porous fiber reinforced composite material, followed by molding the preformed plate in the same method as in Example 1, at 200°C, in an infrared oven, preheat for 2 minutes to expand, and return to normal temperature The molded product is completed by applying pressure after the mold transfer.

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Abstract

Provided is a porous fiber-reinforced composite comprising: first fibrous particles; second fibrous particles; and a binder for binding the first fibrous particles and the second fibrous particles, wherein the first fibrous particles are bound to the second fibrous particles by the binder to form an irregular network structure having pores, wherein the first fibrous particles are formed of inorganic or organic fibers, and wherein the second fibrous particles contain a first thermoplastic resin and the binder contains a second thermoplastic resin, the melting point of the first thermoplastic resin being higher than that of the second thermoplastic resin.

Description

technical field [0001] The present invention relates to porous fiber reinforced composite material and its preparation method. Background technique [0002] Conventional thermoplastic composite materials include a thermoplastic resin composed of reinforcing fibers such as glass fibers or carbon fibers exhibiting high rigidity and a matrix. This thermoplastic composite material exhibits higher mechanical properties than general thermoplastic resin materials, so it is widely used as a raw material for automobiles and construction. In the past, thermoplastic composite raw materials were mainly prepared by mixing reinforcing fibers with thermoplastic resins and then molding them through extrusion or molding processes. Recently, in order to improve strength and productivity, dry needle punching processes or wet papermaking processes have been used to preferentially prepare materials containing Raw materials in the form of mats of reinforcing fibers, after which composites are pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K7/02C08J5/04C08L101/00C08K7/22
CPCD04H1/732C08J5/047D04H1/4218D04H1/5412D04H1/5418
Inventor 安承贤韩庆锡郑胜文
Owner LG HAUSYS LTD