JPH07150007A - Phenolic resin molding material - Google Patents

Abstract

PURPOSE:To obtain a phenolic resin molding material good in the surface appearance after cut, low in the wear of a cutting edge used for cutting the molding material, thus excellent in longterm cuttability. CONSTITUTION:This phenolic resin molding material can be obtained by incorporating 100 pts.wt. of phenolic resin with 70-200 pts.wt. of coconut shell flour wholly passable through a 200-mesh sieve and <=50 pts.wt. of another organic filler wholly passable through 100-mesh sieve.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phenol resin molding material having good machinability during cutting, less wear of a cutting edge, excellent long-term machinability, and good appearance after cutting. Is.

[0002]

2. Description of the Related Art Heretofore, phenolic resin molding materials have mainly used wood powder or pulp as an organic filler, and have also incorporated an inorganic filler if necessary. When using wood flour or pulp,
The machinability is good, but the appearance of the cut surface is very poor. Further, when an inorganic filler is blended, the appearance of the cutting surface is improved, but there is a problem that the cutting blade is heavily worn and the long-term machinability is poor.

[0003]

The present invention has been made as a result of various studies in order to solve the above-mentioned problems of the prior art, and the purpose thereof is to obtain good machinability during cutting. Also, the wear of the cutting edge is low, and it has excellent long-term machinability.
Another object of the present invention is to provide a phenol resin molding material having a good appearance after cutting.

[0004]

The present invention is a phenol resin molding material in which a phenol resin and coconut shell powder as a filler and other organic filler are blended, and the coconut shell is added to 100 parts by weight of the phenol resin. Powder is 70 ~
200 parts by weight and 50 parts by weight or less of other organic fillers are blended. Preferably, the coconut shell powder used has a particle size of 200 mesh, and the other organic fillers are 100 mesh. It is a phenol resin molding material characterized by being all-through.

The coconut shell powder used is preferably all 200 mesh, and when coconut shell powder with a particle size larger than 200 mesh is used, the appearance after cutting becomes poor. The amount of coconut shell powder is 1 phenol resin
It is preferable to add 70 to 200 parts by weight to 100 parts by weight. It is more preferably 100 to 150 parts by weight. When the amount is 70 parts by weight or less, the amount of resin in the material is large, burrs are generated during molding, and moldability tends to be poor. When the amount is 200 parts by weight or more, the productivity of the molding material often deteriorates.

Other organic fillers used in the present invention include, for example, wood flour, pulp, crushed cloth, fir shell powder, wheat shell powder, coconut shell powder, walnut powder and coffee shell powder. It is preferable that all of these fillers are 100 mesh. If the particle size is larger than 100 mesh, the appearance after cutting will deteriorate. Further, the blending amount of these fillers is preferably 50 parts by weight or less, and more preferably 5 to 40 parts by weight. 5
If it is 0 parts by weight or more, the appearance after cutting may be deteriorated,
In some cases, the wear of the cutting blade is large, and long-term machinability is deteriorated. Two or more kinds of these organic base materials may be used in combination. A molding material is obtained by adding a lubricant, a coloring agent, a curing catalyst and the like to a material composed of such a phenol resin and a filler and kneading the mixture by heating.

[0007]

In the present invention, since the coconut shell powder used has a fine particle size of 200 mesh throughout, the molded article using the molding material of the present invention has a good appearance, and also the appearance after cutting. Is smooth, and whitening of the cut surface does not occur due to irregular reflection on the surface. Furthermore, by using a 200 mesh all-through type, the dispersibility of the coconut shell powder is improved, and it is easy to disperse it uniformly in the molding material, and it is easy to be highly filled, and the sparse part in the molded product is deteriorated. Thus, a uniform cutting surface can be obtained without a speckled pattern on the cutting surface.

By using another organic filler as a part, workability and moldability at the time of heating and kneading can be made as good as those of conventional molding materials. Further, since the inorganic filler is not used, wear of the cutting blade during cutting is reduced, and a phenol resin molding material having excellent long-term machinability and low specific gravity can be obtained.

[0009]

EXAMPLES Next, the present invention will be explained based on Examples and Comparative Examples. Here, "part" means "part by weight". The materials and formulations shown in Table 1 were kneaded with a heating roll to obtain a phenol resin molding material.

[0010]

[Table 1]

Comparative Example 1 is a case where the mixing ratio of the coconut shell powder and the wood powder of Example 1 was changed. Comparative Example 2 is a case where coconut shell powder is not used and wood powder and a crushed cloth are used as the organic filler. Example 1 is a case where coconut shell powder, wood powder and a crushed cloth were used in combination. In Example 2, when coconut shell powder and wood powder were used in combination, a long-term cutting test was performed on the molding materials obtained in each Example and Comparative Example. The results obtained at that time are shown in Table 2.

[0012]

[Table 2]

[Measurement Method] (1) Appearance of Molded Article: Visual observation. (2) Long-term machinability: A cylindrical molded product of 100φ × 60 mm is set on a lathe, and the surface of the cylindrical molded product is cut by a blade coated with a diamond at a cutting thickness of 0.5 mm, a rotation speed of 3000 rpm, and a blade feed speed of 0.5 mm. It was continuously cut under the condition of / sec, and the number of white lines on the cutting surface was taken as the long-term machinability. (3) Cutting blade wear amount: Continuous cutting under the above cutting conditions,
The difference between the original weight of the cutting blade and the weight of the blade after 200 continuous cuttings was determined. (4) Appearance of cutting surface: The cutting surface during cutting was visually confirmed. All tests use unused cutting blades.

[0014]

The phenol resin molding material using the coconut shell powder according to the present invention has good machinability, and particularly when using 200 mesh full coconut shell powder and 100 mesh full other organic filler. It is possible to provide a molding material having a good surface appearance after cutting, little wear of a cutting blade, and excellent long-term machinability.

Claims (2)

[Claims] 1. A phenol resin molding material comprising a phenol resin and coconut shell powder as a filler and another organic filler, wherein the coconut shell powder is 70 to 200 parts by weight per 100 parts by weight of the phenol resin. And other organic fillers are 50 parts by weight or less, a phenol resin molding material. 2. The phenol resin molding material according to claim 1, wherein the coconut shell powder has a particle size of 200 mesh all-through and the other organic filler has 100 mesh all-through.