JPS58142932A - Preparation of phenolic resin molding material - Google Patents

Abstract

PURPOSE:To prepare a molding material having excellent mechanical strength, by compounding glass fibers to kneaded and pulverized phenolic resin molding material. CONSTITUTION:A phenolic resin is mixed with a curing agent, etc. necessary for a molding material and if necessary, a filler other than glass fiber, and kneaded and pulverized. The pulverized material is compounded with 5-20wt% glass fiber, preferably the fiber free from collecting agent and having a diameter of 100-300mu. Since the glass fiber is added to the resin after the resin pulverization process, it is contained in the molding material without being broken or crushed, and fully exhibits its original strength.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a rounded 7-enol resin molding material that provides a phenolic resin molding material with excellent mechanical strength.

For use in automobiles when turning the energizer, clutch, or brake.
Recently, phenolic resins have been increasingly used.

Phenolic resin molding materials used in such parts are required to have excellent mechanical strength at high temperatures, such as rotatability at high temperatures.

Therefore, in the past, asbestos was used as a filling material to avoid meeting the first demand, but as the harmful effects of asbestos were pointed out, alternative filling materials were used. *Glass fiber is considered to be extremely promising as such a substitute.

However, when it is actually used, it becomes clear that, contrary to the IBK, the necessary mechanical strength cannot be obtained.

This invention was made in view of these circumstances, and it uses glass fiber as at least a part of the filler.
To provide a method for producing a phenolic resin molding material, which can produce a phenolic resin molding material having higher strength, for example, 15 cm/cm or more in burr strength and 7 kg-cm/cm" or more in Charpy impact strength. The purpose is to

According to the inventor's research, the reason why the desired effect cannot be obtained even when using glass fibers is as follows. That is, manufacturing process 1 of phenolic resin molding material
1 includes a kneading process and a crushing process as necessary processes, so the glass fibers (glass chops) are shredded during kneading and crushing, and their original strength is not exhibited.

Therefore, in order to manufacture phenolic resin molding materials, the glass fibers were processed by grinding process. As a result, a phenolic resin molding material with excellent mechanical strength can be obtained. This is how this invention was completed.

That is, in this invention, when a phenol resin is blended with materials necessary as a molding material, the mixture is kneaded and crushed to obtain a phenol resin molding material, glass fiber is added in the crushing step 11Klk. The gist is the manufacturing method of resin molding materials. This will be explained in detail below.

The phenolic tree kF1 may be any ordinary one, and is not limited to 41. Therefore, the manufacturing method is also the same.

The phenolic tree WiIK thus obtained is blended with various well-known materials necessary as a molding material. These include curing agents such as methylenetetramine, additives such as stearate, and coloring agents. If necessary, fillers other than glass fiber may be added.

The resulting nine formulations are kneaded and ground as usual. 1N
&The testing and crushing means during the kneading process are all 4 conventional methods.

After the crushing step, the glass fibers are subjected to 11&addition.

The addition means are as known. As glass fiber,
It is preferable that a sizing agent is attached and the number is 1100 to 30G#. However, it is not limited to this, and 1 to 3 m
Al's focus is 9 glass chopped ° Nutland and 4 good. However, the glass chop is difficult to unfocus, and it is difficult to obtain uniform dispersion of the glass.

As for the amount of glass fiber added, if it is less than 5 ml, the effect will be small, and if it exceeds 20 ml, problems such as poor appearance of the molded product may occur, so it is recommended to choose between 5 and 20 ml. The preference is not limited to this.

According to the manufacturing method of the phenolic resin molding material according to the present invention, since the glass fibers are subjected to I& after the pulverization process, the glass fibers are not cut or pulverized, and their original strength is significantly reduced. Demonstrate. Therefore, it is possible to create a phenolic resin molding material with high mechanical strength.

Next, examples will be described together with comparative examples.

Phenol 11 & molding material was obtained by mixing and crushing the Queen's mixture, and then post-adding glass fiber in the amount shown in Table 1 (no post-addition was made in the comparative example).

Novolac type phenolic resin s2 weight IG (MP 90
℃) Hexamethylenetetramine 6 weight Stearin # 1 weight Coloring agent
1 weight ginseng/wood powder
4G weight reference Molded products made using each of the obtained phenolic resin molding materials were examined for bending strength, shear strength, hard impact strength, and appearance.The results are shown in Table 1. It is also better than the comparative example.

! 1 table

Claims (1)

[Claims] (1) When phenolic resin is mixed with materials necessary as a molding material and pulverized to obtain a phenolic resin molding material), glass fibers are heated after the pulverization process*. A method for producing a phenol IIIiI molding material. (As a glass fiber, there is no sizing agent attached.)
0-300. A method for producing a phenolic resin molding material according to claim 1, in which the following is selected. (3) The method for producing a 7-enol resin molding material according to claim 1 or 2, wherein the amount of glass fiber added is selected from 5 to 20% by weight.