JPS60101140A - Phenolic resin molding material - Google Patents

Abstract

PURPOSE:The titled molding material having ease of molding, and excellent flexural strength, impact strength, and heat resistance, obtained by incorporating glass fibers having high filament bundle integrity in a specified wt. ratio into a resin composition comprising a phenolic resin, a reinforcement, a filler, a curing agent, etc. CONSTITUTION:A reinforcement, a filler (e.g. a clay), a curing agent (e.g. hexamethylenetetramine), and other additives (e.g. pigments) are incorporated into a phenolic resin. After melting the phenolic resin composition obtained, glass fibers of 1-6mm. in length, having high filament bundle integrity are mixed and dispersed homogeneously therein in an amount of 4-30wt% of the total composition to give the objective phenolic resin molding material. The molding material is easy to mold on injection molding machines, transfer molding machines, etc. Glass fibers having high filament bundle integrity are obtained by applying a sizing in an amount of 0.2-1wt% to the glass filaments which are gathered into a bundle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a phenolic resin molding material. Phenol resin has excellent heat resistance and physical properties, and has traditionally been used as a material for various moldings. Consideration is being given to switching to plastic materials in order to reduce the weight of various metal parts, or to integrate metal parts.

In general, phenolic resin molding materials contain, as fillers, organic materials such as wood flour and pulp, and organic materials such as calcium carbonate, mica, clay, asbestos, and glass fiber, either alone or in combination. For parts requiring heat resistance, dimensional stability, and mechanical strength in pipes, phenolic resin molding materials blended with inorganic fillers based on glass fibers have been used. However, metal parts used in automobiles and the like have been insufficient in terms of strength under heat, side thermal creep resistance, impact resistance, etc. In order to solve these problems, phenolic resin molding materials containing long fiber glass fibers (e.g. Nippon Oil Seal φJl! PG1231) are commercially available, which are kneaded by a kneader 1 or Henschel mixer, etc. 5.4)
The drawback was that injection molding and transfer molding were not possible. In addition, materials manufactured using hot rolls, extruders, etc. have good injection moldability, but glass fibers are sheared and broken, so short fibers (
005-05 Keicho), it could not provide a sufficient reinforcing effect, and had the drawback of being unreliable as a substitute material for metal parts that require high reliability or high loads.

As a result of intensive research in order to solve these problems, the present inventors found that by blending highly converged glass fibers into a phenolic resin composition, mechanical properties such as bending strength and mechanical strength, We have discovered a new phenolic resin molding material that has excellent heat resistance and can be easily molded using thermosetting injection molding machines, transfer molding machines, etc.

Next, the present invention will be explained in detail.

The present invention is a phenolic resin composition obtained by blending a phenolic resin with reinforcing materials, fillers, hardeners, and other additives, and a total composition of highly converged glass fibers with a length of 1.0 to 6.0. It is manufactured by mixing 4 to 30% by weight of Highly focused glass fibers differ depending on the type of focusing agent, but 0
．． Adhesion from 2 to 1,0% by weight - Jt (relative to glass fibers)
is preferred. If the coating amount is less than 0.2 inch, the convergence will be poor, and when mixed uniformly with the phenolic resin composition, the fibers will become entangled with each other and become flocculent, resulting in large strength variations in the resulting molded product, and molding problems. There was a defect in the appearance of the product. Further, when the amount of adhesion is 1.0% or more, the glass fibers are unraveled because they are super-converged, and uniform strength cannot be obtained. Highly focused glass fiber mixture is 4-30% by weight
is within the range of If it was less than 4% by weight, sufficient strength and creep resistance could not be obtained, and if it was more than 30% by weight, bulking was large and injection molding was difficult.

The phenolic resin molding material of the present invention is obtained by thoroughly mixing a phenol resin, a curing agent, a mold release agent, a reinforcing material, a pigment, etc. in advance, and then -transforming and melting the mixture, followed by uniformly mixing and dispersing high-convergence glass fibers. The phenolic resin molding material thus obtained has superior mechanical strength compared to conventional materials, has low IJ-cure properties when heated, and can be molded under the same conditions as conventional molding materials.

The present invention will be explained below based on examples.

Example 1.2, Comparative Example 1.2 According to the formulation table shown in Table 1, after mixing, the mixture was kneaded and pulverized using a hot roll to obtain a phenol resin composition. This composition contained 10% by weight of highly converged glass fibers (Example-1
), 15% by weight (Example-2) for 5 minutes ■ Blender -
to obtain a phenolic resin molding material.

(1) As a result of injection molding Example 1.2, there was no problem in charge performance in the hopper and the moldability was also good.

On the other hand, in Comparative Example 1, continuous molding by injection molding was difficult due to large coverage. Furthermore, the properties of the obtained molded product (mold temperature: 175° C., molding time: 605 ec) have less variation and higher strength than those of Comparative Example 1.

(2) Furthermore, compared to Comparative Example 2, Examples 1 and 2 in which highly converged glass fibers were mixed have higher strength and significantly less deformation due to bending creep at high temperatures.

patent applicant Sumitomo Bakelite Co., Ltd.

Claims (2)

[Claims] (1) A phenolic resin composition containing a phenolic resin, a reinforcing agent, a filler, a curing agent, and other additives has a high concentration of 1, 0 to 6. 4' is made by mixing Oms length glass fiber at 4 to 30% by weight of the total amount! J,g
, a phenolic resin molding material. (2) The phenolic resin molding material according to claim 1, wherein the amount of the binding agent attached to the glass fibers is 0.2 to 1.0 times.