JPH10330585A - Phenolic resin molding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a phenolic resin molding material having a good melt flowability without detriment to the mechanical characteristics and molded appearance by compounding a phenolic resin with glass fibers pretreated with a size contg. wax as a part thereof. SOLUTION: This molding material is prepd. by compounding 100 pts.wt. phenolic resin with 50-200 pts.wt. glass fibers pretreated with a size contg. wax as a part thereof. Wax used is pref. selected from among a fatty acid wax, an ester wax, an amide wax or a salt thereof, a paraffin wax, or mixtures of these waxes and pref. has an m.p. of 40-100 deg.C. In the production process of the glass fibers, only the surface of the fiber is effectively wetted by wax by using a size contg. wax; therefore, the melt flowability of the resultant molding material can be improved with a smaller amt. of wax than in the case when wax is compounded into the molding material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass fiber-filled phenolic resin molding material having good flowability at the time of melting without deteriorating mechanical properties and appearance of a molded product.

[0002]

2. Description of the Related Art Conventionally, a glass fiber-filled phenolic resin molding material uses a low-viscosity phenolic resin in order to improve the fluidity of the molding material when it is melted, prolongs the flow during the materialization process of the molding material, and adds wax. However, there have been problems such as the curability of the molding material being reduced, the appearance of the molded product being deteriorated, and the mechanical strength being being reduced.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a glass fiber-filled phenolic resin molding material having good flowability at the time of melting without deteriorating mechanical properties and appearance of a molded product.

[0004]

The present invention focuses on a glass fiber sizing agent used as a filler, and uses 50 to 2 glass fibers containing wax as a part of the sizing agent.
The present invention relates to a phenolic resin molding material characterized in that it is added in an amount of 00 parts by weight. In the present invention, the wax used as a part of the glass fiber sizing agent preferably has a melting point of 40 to 100 ° C., and is preferably a fatty acid wax or an ester wax, but the type is not particularly limited.

As a method of improving the mechanical strength of a molding material, a method of blending a fibrous organic or inorganic substrate is known. In particular, glass fiber is used as an effective means for various kinds of molding materials. Have been. However, compounding a fibrous base material increases the viscosity of the material at the time of melting, which makes it difficult to mold a molded article having a complicated shape or increases the load on the molding machine. It is considered that the melt viscosity is increased because the fibrous base material has a higher resistance when flowing than a powdery or spherical raw material.

[0006] Conventionally, a wax has been blended into the molding material to improve the fluidity of the material at the time of melting and molding and the releasability at the time of molding. The addition of wax to the material had problems such as deterioration of mechanical properties and deterioration of the appearance of a molded product. However, the present invention has solved this problem.

In the present invention, the glass fiber used for the filler is mixed with a wax in a part of a sizing agent in advance in the production process, so that only the surface of the glass fiber is effectively treated with the wax for improving the fluidity. It can be wet. For this reason, compared with the case where wax is incorporated into the molding material as a part of the formulation, the amount of wax used may be smaller, the mechanical properties are less reduced, the appearance of the molded article is less deteriorated, and the flow of the molding material during melting is small. Performance can be improved.

The wax used in the present invention is a thermosetting resin molding material which is conventionally used as a mold release agent, and is a fatty acid wax, an ester wax, an amide wax or a metal salt thereof. , And paraffin wax or a mixture thereof is preferably used.

[0009] The wax used in the present invention preferably has a melting point of 40 to 100 ° C. Preferred examples of the fatty acid wax include stearic acid, and the ester wax includes carnauba wax, but the type is not particularly limited. When the melting point is 40 ° C. or lower, there is a problem such as solidification of the material at room temperature, which is not preferable. When the melting point is 100 ° C. or higher, the melting start temperature of the molding material is 1
Considering the temperature around 00 ° C., the fluidity is not sufficiently improved, and is not appropriate.

The molding method for obtaining a molded article from the phenolic resin molding material according to the present invention can be applied to any of compression molding, transfer molding, injection molding and the like, and is not particularly limited.

[0011]

EXAMPLES The raw materials shown in Table 1 were heated and kneaded by a mixing roll in a predetermined mixture, and pulverized to produce a molding material. For the obtained molding material, the spiral flow and the melting torque of the material were measured by Labo Plastomill of Toyo Seiki Co., Ltd. Next, a test piece (JIS K 6911) was formed by transfer molding at 175 ° C. for 3 minutes. The bending strength (normal temperature, 120 ° C. when heated) was measured using this test piece. The appearance of the molded product is 50φ × in the same way as the bending strength.
A 3 mm test piece was molded and the appearance was visually determined.
The results are shown in the lower column of Table 1.

[0012]

[Table 1]

[0013]

As is apparent from the above results, the phenolic resin molding material of the present invention can improve the flowability of the molding material during melting without deteriorating the mechanical properties and appearance of the molded product. It is easy to mold a molded article having a complicated shape, and the load on the molding machine can be reduced.
Therefore, it is suitable as an industrial phenolic resin molding material.

Claims (2)

[Claims] 1. A glass fiber containing wax as a part of a sizing agent in 100 to 100 parts by weight of a phenol resin.
A phenolic resin molding material, which is added in an amount of 0 parts by weight. 2. The phenolic resin molding material according to claim 1, wherein the melting point of the wax is 40 to 100 ° C.