JPH07102576B2 - Manufacturing method of thermosetting resin molding material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a thermosetting resin molding material suitable for molding automobile parts and the like.

Conventional technology Conventionally, thermosetting resin molding materials that contain a filler in a thermosetting resin such as phenolic resin are molded products that are superior in heat resistance, that is, mechanical strength when heated, compared to thermoplastic resin molding materials. Can be manufactured.

In recent years, thermosetting resin molding materials have been reviewed in order to reduce the weight, reduce the number of manufacturing steps, and reduce the cost by substituting plastic materials for metal materials.

Generally, a thermosetting resin molding material is used by blending an organic substance such as wood powder and pulp, an inorganic fiber such as asbestos and glass fiber, and an inorganic powder such as calcium carbonate and talc as a filler. Of these fillers, organic substances such as wood powder and pulp are not used for applications requiring heat resistance,
Inorganic fibers and powders are used for such applications.
In particular, thermosetting resin molding materials containing glass fibers are
Molded products with excellent heat resistance can be manufactured.

The thermosetting resin molding material containing the filler is obtained by mixing and kneading the both, but the one containing glass fiber as the filler has the following problems.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention A thermosetting resin molding material containing glass fiber as a filler tends to be insufficient in the above kneading, and when injection molding is performed using this material, the material is hard to fall off smoothly from the hopper. In addition, it takes a long time to weigh the shot. This tendency is particularly remarkable when the glass fiber content is large.

An object of the present invention is to provide a thermosetting resin molding material containing glass fiber as a filler, which has good hopper removal property and short measuring time.

Means for Solving the Problems In order to solve the above problems, the method for producing a thermosetting resin molding material according to the present invention is a method of mixing and kneading a filler containing glass fibers and a thermosetting resin, and adding aluminum silicate. It is characterized by being mixed.

Action Aluminum silicate acts to loosen the bundle of compounded glass fibers, and improves the dispersibility of the glass fibers in the thermosetting resin during mixing and kneading. As a result, the lack of kneading due to the incorporation of glass fibers is eliminated, and a uniform molding material is obtained. As a result, the hopper dropping property is improved and the measuring time is shortened.

Examples The thermosetting resin used in the present invention is a phenol resin (novolak type, resol type), epoxy resin, polyester resin, polyimide resin, or the like.

As the aluminum silicate, an inorganic compound containing this as a main component may be used, but the particle size thereof is preferably 20 μm or less.

Glass fiber has a diameter of 6 ~ 13μ, which is used for normal FRP,
A length of about 3 to 12 mm can be used.

Additives such as a release agent and a curing agent are added to these, and the mixture is kneaded with a roll or the like and then pulverized to obtain a desired thermosetting resin molding material.

The details will be described below.

Examples 1 to 4 and conventional example Novolak type phenol resin (SP95 ° C.), glass fiber (length 3 mm), glass powder, in the compounding ratio shown in Table 1.
90-100 aluminum silicate using a roll kneader
The mixture was kneaded and kneaded at 3 ° C. for 3 minutes. Then, it cooled and pulverized and the phenol resin molding material was obtained.

Table 1 also shows the results of evaluating the hopper falling property and the measuring time of this molding material. As for the hopper dropping property, 1 kg of the molding material was put into a funnel-shaped jig having a diameter of the T portion opening of 5 cm, an inclination angle of 60 ° and a height of 30 cm, and the time required for flowing out from the lower opening was measured. Weighing time is 30 Using an injection molding machine, the time was measured when the cylinder temperature was set to 90 ° C / 50 ° C and the screw rotation speed was set to 30 rpm.

Effect of the Invention As described above, in the method according to the present invention, when the filler containing the glass fiber and the thermosetting resin are mixed and kneaded, by incorporating aluminum silicate, the dispersibility of the glass fiber is improved. Get better. As a result, it is possible to obtain a molding material which has a good hopper dropping property during injection molding and has a short resin measuring time.

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Claims (1)

[Claims] 1. A thermosetting material comprising glass fiber as a filler, which is mixed and kneaded with a thermosetting resin to form a molding material, and aluminum silicate is blended at the time of mixing and kneading. Manufacturing method of resin molding material.