JP2002265752A - Phenolic resin molding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a phenolic resin molding material which excels in abrasion resistance without damaging the heat resistance and dimension stability of a phenolic resin molding material having glass fibers as the major base material. SOLUTION: The phenolic resin molding material comprises, based on the entire molding material, 17-35 wt.% phenolic resin, 10-30 wt.% glass fibers, 30-70 wt.% inorganic substance having a Mohs hardness of >=6.5, and 1-5 wt.% lubricating thermoplastic resin as the lubricant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phenolic resin molding material, and more particularly to a phenolic resin molding material which is excellent in dimensional stability and heat resistance and extremely excellent in abrasion resistance and is suitable as a material for structural parts such as resin pulleys. About the material.

[0002]

2. Description of the Related Art Structural parts such as automobile parts have recently been required to be reduced in size and weight, and phenolic resin molding materials containing glass fiber as a main filler have been used instead of metal materials. I have.

[0003] A phenolic resin molding material in which glass fiber is used as a filler and the content of which is increased has sufficient properties as an alternative to a metal material in terms of heat resistance, dimensional stability and strength. However, when the amount of glass fiber added increases, the abrasion resistance tends to decrease depending on the increase, so that it has been difficult to apply it to applications requiring abrasion resistance such as resin pulleys.

[0004] Under such circumstances, many attempts have been made to improve the abrasion resistance of a phenolic resin molding material containing glass fiber as a filler. For example, Tokuho 6
Japanese Patent No. 45200 discloses an invention of a resin pulley using a novolak type phenol resin as a base resin and glass fibers and glass beads as main fillers.
Japanese Patent No. 70518 discloses an invention of a phenolic resin molding material using aramid fiber, glass fiber and glass powder as a main filler. Further, Japanese Patent Application Laid-Open No. Hei 10-53692 discloses that a glass fiber is used as a main filler. The invention of a phenolic resin molding material using an organic natural material and a lubricant for improving abrasion resistance is disclosed. However,
Since these phenolic resin molding materials use glass fiber as a main filler, they are insufficient for recent demand for further wear resistance. Furthermore, novolak-type phenol resins have a problem that cracks are easily formed, and a material using aramid fiber has a problem that it is difficult to meet the demand for cost reduction.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a phenolic resin molding material containing glass fiber as a main filler, and a phenolic resin molding material capable of improving abrasion resistance without impairing heat resistance and dimensional stability. The purpose is to provide.

[0006]

According to the present invention, a phenol resin is used in an amount of 17 to 35% by weight, a glass fiber is used in an amount of 10 to 30% by weight, and an inorganic substance having a Mohs hardness of 6.5 or more is used. It is a phenolic resin molding material containing up to 70% by weight and 1 to 5% by weight of a lubricating thermoplastic resin as a lubricant.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a phenol resin used in the present invention, a known resin such as a novolak type phenol resin or a resol type phenol resin can be used. When an insert material such as a metal is inserted into the phenolic resin molding material of the present invention when molding an automobile part or the like, a resol-type phenolic resin having excellent thermal shock resistance is more preferable. The amount of the phenolic resin is 17
A range of -35% by weight is preferred. When the blending amount of the phenolic resin is in this range, the kneading property is enhanced, the production of the molding material is facilitated, and the elasticity and wear resistance of the molded article itself are good.

When a novolak-type phenol resin is used as the phenol resin, hexamethylenetetramine is used as a curing agent in an amount of 12 to 2 with respect to the phenol resin.
It is preferable to use 0% by weight.

The glass fiber used in the present invention is not particularly limited in its material, and known glass fibers can be used. The glass fiber is used in the range of 10 to 30% by weight of the whole molding material in order to improve the mechanical strength of the molded product. When the compounding amount of the glass fiber is within this range, mechanical strength and abrasion resistance can be maintained in a well-balanced manner.
As for the glass fiber, it is preferable to use a chopped strand having a fiber length of 1 to 3 mm and a fiber diameter of 5 to 15 μm in order to facilitate the production of a molding material.

[0010] The inorganic substance used in the present invention is an inorganic substance having a Mohs hardness of 6.5 or more, which is 30 to
Used in the range of 70% by weight. When the Mohs hardness of the inorganic substance is 6.5 or more, the inorganic substance is not destroyed, so that it can be prevented from becoming abrasion powder. When the content of the inorganic substance is in this range, mechanical strength and wear resistance can be maintained in a well-balanced manner.

As the inorganic substance having a Mohs hardness of 6.5 or more, generally used silica, zirconia, mullite, alumina or the like can be used.
A mixture of more than one species can be used. As the shape of the inorganic substance, it is preferable to use spherical particles rather than irregularly shaped particles in terms of wear resistance and fluidity of the molding material.

The lubricating thermoplastic resin as a lubricant used in the present invention has a role of further improving abrasion resistance,
It is used in the range of 1 to 5% by weight based on the whole molding material.
When the lubricating thermoplastic resin is in this range, the slipping effect of the molding material can be exhibited, and the kneading property is not affected, so that the molding material can be easily manufactured, and furthermore, there is a cost problem. Is not caused.

As the lubricating thermoplastic resin, a fluororesin or polyethylene can be used. Fine powder having an average particle size of 10 μm or less improves the slipperiness and the abrasion resistance while improving the dispersibility of the resin at the time of kneading. It is preferable in that it can be used. As a fluororesin, for example, ethylene tetrafluoride (trade name: Lubron L-2) manufactured by Daikin Industries, Ltd., and as polyethylene, a commercial name: Miberon XM-221U manufactured by Mitsui Chemicals, Inc. is commercially available. ing.

In the phenolic resin molding material of the present invention, various co-curing agents, pigments, release agents, coupling agents and the like can be used as necessary.

The phenolic resin molding material of the present invention is prepared by mixing and mixing these essential compositions, kneading them using a hot roll, an extruder, or the like, forming them into sheets, or forming them into pellets using a pulverizer or a granulator. And can be manufactured. The obtained phenolic resin molding material is excellent in dimensional stability and heat resistance, and also excellent in wear resistance, and is suitable as a material for structural parts such as resin pulleys.

[0016]

The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In Table 1,
Table 2 shows the mixing ratio of each composition and the characteristics of the obtained phenolic resin molded product.

[0017]

[Table 1]

Examples 1 to 7 The raw materials shown in Table 1 were used and blended at the blending ratios shown in Table 2. The mixed powder was mixed by a Henschel mixer, kneaded by a hot roll and formed into a sheet, and the obtained sheet was pulverized to obtain a molding material.

Next, each molding material was molded into various test pieces, and the molded product was subjected to Taber abrasion, bending strength,
The Charpy impact strength, dimensional change rate and deflection temperature under load were measured.

According to JIS K7205, the wear amount of Taber was measured using CS-17 as a worn wheel, with a load of 1 kg and 60 rp.
The value obtained by dividing the worn mass after 1,000 rotations at m 2 by the specific gravity of the material was determined. The bending strength and the Charpy impact strength were measured according to JIS K 6911. The dimensional change rate was measured at 120 ° C. using a shrinkage test piece according to JIS K 6911.
The dimensional change rate after 1000 hours of treatment was measured. The deflection temperature under load was measured in accordance with JIS K 7207.

As shown in Table 2, Examples 1 to 7 are excellent in abrasion resistance without impairing heat resistance and dimensional stability.

[0022]

[Table 2]

Comparative Examples 1-4 A molding material was prepared and molded into various test pieces in the same manner as in Examples 1-7, and each characteristic was measured. From Table 2, it was difficult to knead Comparative Example 1 because the phenolic resin content was 15% by weight, which was less than the range of the present invention. In Comparative Examples 2 and 3, the mica hardness (Mohs hardness: 2.5 to 3.0) or the potassium titanate whisker (Mohs hardness: 4.0) having a low Mohs hardness was used. . Comparative Example 4 was used as a filler.
Since only glass fiber was used and no other inorganic filler was contained, the amount of wear was remarkably large.

[0024]

As described above, the phenolic resin molding material of the present invention is excellent in heat resistance, dimensional stability and abrasion resistance. Because of these characteristics, the phenolic resin molding material of the present invention is suitable as a material for structural parts such as resin-made pulleys.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor: Ken Nanami 1500, Oji Ogawa, Shimodate City, Ibaraki Pref.

Claims (4)

[Title of the Invention] Phenolic resin molding material [Claims] 1. A phenolic resin of 17 to 35% by weight, a glass fiber of 10 to 30% by weight,
A phenolic resin molding material comprising 30 to 70% by weight of an inorganic substance having a Mohs hardness of 6.5 or more and 1 to 5% by weight of a lubricating thermoplastic resin as a lubricant. 2. The phenolic resin molding material according to claim 1, wherein the inorganic substance is at least one inorganic substance selected from silica, zircon, mullite, and alumina. 3. The phenolic resin molding material according to claim 1, wherein the inorganic substance is spherical silica and / or spherical alumina. 4. The method according to claim 1, wherein the lubricating thermoplastic resin has an average particle size of 1
The phenolic resin molding material according to any one of claims 1 to 3, wherein the phenolic resin molding material is at least one resin selected from the group consisting of fluororesins having a size of 0 µm or less and polyethylene.