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Heat-curable resin composition, fiber-reinforced molding material and molded article

A resin composition and fiber-reinforced technology, which is applied in the field of moldings, can solve problems such as insufficient dispersion of fiber-reinforced materials, poor mechanical strength of moldings, and increased preparation processes, and achieve light weight, excellent low-pressure formability, and remarkable Thixotropic effect

Inactive Publication Date: 2011-01-26
ASAHI YUKIZAI KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even with the method described in Patent Document 2, two types of thermosetting resin compositions must be prepared in order to form the low-specific-gravity SMC layer and the high-strength SMC layer, which increases the number of manufacturing steps and greatly reduces productivity.
Also, on the surface side of the SMC, especially on the surface portion of the low-specific-gravity SMC layer side, the fiber reinforcement material is not sufficiently dispersed, resulting in problems such as poor mechanical strength or poor surface smoothness of the resulting molded body.

Method used

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  • Heat-curable resin composition, fiber-reinforced molding material and molded article
  • Heat-curable resin composition, fiber-reinforced molding material and molded article
  • Heat-curable resin composition, fiber-reinforced molding material and molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-

[0070] 40 parts by mass of resole phenolic resin (trade name: AKP-012; manufactured by Asahi Organic Materials Co., Ltd.) and 17 parts by mass as a hollow filler have a dense packing density of 0.43 g / cm 3 Glass spheres (trade name: Z-60; manufactured by Tokai Kogyo Co., Ltd.), 12 parts by mass densely packed with a bulk density of 0.81g / cm 3Kaolin (trade name: HA; manufactured by Sanyo Clay Industry Co., Ltd.), 0.6 parts by mass of calcium hydroxide as a curing accelerator (thickener), 1 part by mass of zinc stearate as a release agent, and 0.5 parts by mass 3-Glycidoxypropyltrimethoxysilane as a silane coupling agent was stirred and mixed with a Hand Mixer for about 10 minutes to prepare a paste for SMC as a thermosetting resin composition. Then, the viscosity and thixotropic index of the obtained paste were measured as described above, and the results were viscosity (25° C.): 54000 mPa·s and thixotropic index: 1.82, respectively.

[0071] Then, using the SMC preparation de...

Embodiment 2

[0074] In embodiment 2, it is 0.79g / cm to use close-packed bulk density 3 Kaolin (trade name: FY86; manufactured by Fujilight Industry Co., Ltd.), embodiment 3 uses a dense packing bulk density of 1.15g / cm 3 Kaolin (trade name: TP; Sanyo Clay Industry Co., Ltd. system) instead of the dense packing of Example 1 has a bulk density of 0.81g / cm 3 Kaolin, except that, in the same manner as in Example 1, a paste for SMC as a thermosetting resin composition was prepared, and the viscosity and thixotropic index of the paste were measured. The results are shown in Table 1 below. In addition, SMC was prepared using the obtained paste and glass fiber, and the volume content of each raw material (phenolic resin, hollow filler, kaolin, and glass fiber) was the same as the volume content of each raw material in Example 1 above. This SMC was evaluated for its low-pressure formability, and the results are shown in Table 1 below. In addition, a molded body was produced using this SMC. Then,...

Embodiment 4-

[0076] 43 parts by mass of resol resin (trade name: AKP-012; manufactured by Asahi Organic Materials Co., Ltd.) and 11 parts by mass are used as hollow fillers. The bulk density is 0.25 g / cm 3 Glass spheres (trade name: T-36; manufactured by Tokai Kogyo Co., Ltd.), 13 parts by mass densely packed with a bulk density of 0.81 g / cm 3 Kaolin (trade name: HA; manufactured by Sanyo Clay Industry Co., Ltd.), 0.6 parts by mass of calcium hydroxide as a curing accelerator (thickener), 1 part by mass of zinc stearate as a release agent, and 0.5 parts by mass 3-glycidoxypropyltrimethoxysilane as a silane coupling agent, and stirred and mixed with a hand mixer for about 10 minutes to prepare a paste for SMC as a thermosetting resin composition. Then, the viscosity and thixotropic index of the paste obtained as above were measured, and the obtained results are shown in Table 1 below. In addition, SMC was prepared by impregnating the paste into glass fibers at the content shown in Table 1 ...

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Abstract

Provided are molded articles made of a fiber-reinforced material which are lightweight and have superior surface smoothness and mechanical strength, heat-curable resin compositions that are favorably used in the manufacture of said molded articles, and fiber-reinforced molding materials that are used in manufacturing said molded articles and have a superior low-pressure moldability. As a heat-curable resin composition to be used in the fiber-reinforced molding material, that which comprises a heat-curable resin, a hollow filler with packed bulk density of 0.24-0.45 g / cm3, and kaolin clay with packed bulk density of 0.60-1.20 g / cm3 as essential components was used.

Description

technical field [0001] The present invention relates to a thermosetting resin composition that is particularly useful as a binder for fibrous substrates, a fiber-reinforced molding material obtained using the composition, and a molded article obtained by molding and curing the fiber-reinforced molding material. Background technique [0002] Conventionally, as is well known, moldings made of fiber-reinforced molding materials called FRP have excellent mechanical strength and durability, so they can be used, for example, as bathtubs, water storage tanks, purification tanks, exterior and interior Housing-related parts for decorative panels, vehicle-related parts, advertising boards, pleasure boats, bobbins, etc. [0003] As the above-mentioned fiber-reinforced molding material, the following composite material can be used, and the composite material is prepared as follows: add an inorganic filler to a thermosetting resin, and add additives such as a curing accelerator and a mol...

Claims

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Application Information

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IPC IPC(8): C08L101/00B29B11/16C08J5/04C08K3/34C08K7/02C08K7/22C08L61/06
CPCC08J5/24C08J5/043C08J2361/06C08J5/10B29B11/16C08J5/244C08J5/249
Inventor 筱原宽文
Owner ASAHI YUKIZAI KOGYO CO LTD
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