JPH04345650A - Phenol resin molding material - Google Patents

Abstract

PURPOSE:To prepare the title material having a good balance among heat resistance, mechanical strengths, abrasion resistance, and electrical properties by compounding a specific resin, a glass fiber, a natural org. fiber, and potassium titanate as the main components. CONSTITUTION:The title material is prepd. by compounding at least one resin selected from the group consisting of a phenol resin, a xylene resin, and a xylene-modified phenol resin with 5-40wt.% (based on the material, the same applies hereunder) glass fiber, 5-30wt.% natural org. fiber, and 1-30wt.% potassium titanate. A pref. glass fiber is obtd. by binding monofilaments with a diameter of 2-30mum to form a strand and cutting the strand to 0.1-25mm length. An example of potasium titanate is one prepd. by allowing potassium titanate (K2O.8TiO2) to grow in fiber form.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides heat resistance, mechanical strength,
Concerning phenolic resin molding materials with excellent wear resistance and electrical properties.

0002

BACKGROUND OF THE INVENTION Phenol resins are widely used as molding materials mixed and kneaded with fillers, plasticizers, colorants, mold release agents, and the like.

Generally, phenolic resin molding materials use wood flour as the main filler, and therefore have drawbacks in heat resistance, mechanical strength, abrasion resistance, and the like. To improve this drawback, there are methods using inorganic materials such as asbestos, calcium carbonate, and talc as fillers. Although this improves heat resistance, it has drawbacks in mechanical strength and abrasion resistance. In order to improve this, graphite and molybdenum disulfide are used as fillers, but although the wear resistance is improved, there are drawbacks in mechanical strength and electrical properties. In an attempt to improve this, products using glass fiber as a filler have high heat resistance and mechanical strength, but have a drawback in abrasion resistance (especially abrasion of the mating metal material). Furthermore, those using natural organic fibers as fillers have good mechanical strength and abrasion resistance, but lack heat resistance. Under these circumstances, a well-balanced phenolic resin molding material having excellent heat resistance, mechanical strength, abrasion resistance, and electrical properties has been sought.

0004

[Problems to be Solved by the Invention] An object of the present invention is to provide a well-balanced phenolic resin molding material with excellent heat resistance, mechanical strength, abrasion resistance, and electrical properties that eliminates the above-mentioned drawbacks. It is.

[0005]

[Means for Solving the Problems] The present invention is based on extensive research aimed at achieving the above object, and as a result, it has been discovered that the molding material described below has characteristics that achieve the above object.

That is, the present invention provides (a) one or more resins selected from phenolic resins, xylene resins, and xylene-modified phenolic resins, (b) glass fibers, (c) natural organic fibers, and ( d) A phenolic resin molding material characterized by containing potassium titanate as a main component, containing 5 to 40% by weight of glass fiber based on the molding material.
Natural organic fiber 5-30% by weight, potassium titanate 1
It is a well-balanced phenolic resin molding material containing up to 30% by weight and excellent in heat resistance, mechanical strength, abrasion resistance, and electrical properties.

[0007] As (a) one or more resins selected from phenol resins, xylene resins and xylene-modified phenol resins used in the present invention, the following may be mentioned. As the phenolic resin, for example, phenols such as phenol and cresol, or phenols modified with molasses, lignin, xylene, naphthalene, or petroleum aromatic hydrocarbons, and formalin or paraformaldehyde are blended in an appropriate molar ratio. , a novolac-type phenolic resin initial condensate, a resol-type phenolic resin initial condensate, and a mixture of a novolak-type phenol resin initial condensate and a resol-type phenolic resin initial condensate, which are obtained by reaction under a catalyst. Examples of the xylene resin or xylene-modified phenol resin include xylene formaldehyde resin or xylene-modified phenol resin obtained by reacting xylene formaldehyde resin with phenol or alkylphenol.

[0008] As the glass fiber (b) used in the present invention, a strand obtained by converging single fibers having a diameter of 2 to 30 μm and cutting it into pieces of 0.1 to 25 mm can be mentioned.

[0009] Examples of the natural organic fiber (c) used in the present invention include cotton flock, α-cellulose, flax, hemp, jute, cotton woven fabric, and fluff powder.

Further, as (d) potassium titanate used in the present invention, for example, potassium octitanate (K2O.
8TiO2) grown into fibers manufactured by Otsuka Chemical Co., Ltd.
The product name is "Thymos".

As described above, the present invention comprises (a) one or more resins selected from phenolic resins, xylene resins, and xylene-modified phenolic resins, (b) glass fibers, (c) organic natural fibers, and (d) A phenolic resin molding material whose main component is potassium titanate, and the blending ratio of each component will be explained below.

The blending ratio of glass fiber is 5 to 40% by weight based on the molding material. If it is less than 5% by weight, the mechanical strength will be weak, and if it exceeds 40% by weight, the abrasion resistance will be poor, which is not preferable. It is preferably 15 to 25% by weight. The blending ratio of natural organic fibers is 5 to 3 to the molding material.
If it is 0% by weight and less than 5% by weight, the mechanical strength will be weak;
If it exceeds 30% by weight, heat resistance deteriorates, which is not preferable. It is preferably within the range of 8 to 20% by weight. The mixing ratio of potassium titanate is 1 to 30% by weight based on the molding material. If it is less than 1% by weight, it has no effect on wear resistance and heat resistance, and if it exceeds 30% by weight, the mechanical strength is poor, which is not preferable. Therefore, each component is limited within the above range.

In addition to the above, the phenolic resin molding material of the present invention may optionally contain additives such as a curing agent, a coloring agent, a curing accelerator, a flame retardant, a mold release agent, a lubricant, a coupling agent, and a plasticizer. can be blended.

The molding material of the present invention is usually produced as follows. A predetermined amount of resin, glass fiber, natural organic fiber, potassium titanate, a curing agent and other additives as necessary are added and mixed, uniformly dispersed, heated and kneaded in a kneader, and then cooled and solidified. It is crushed into a suitable size using a crusher to obtain a phenolic resin molding material.

[0015]

[Examples] The present invention will be specifically explained below with reference to Examples, but the present invention is not limited to these Examples. Hereinafter, "%" means "% by weight".

Example 1 45% novolac type phenolic resin, 7% hexamethylenetetramine, 20% glass fiber, 10% cotton flock.
, 10% of potassium octatitanate, and 8% of other additives were mixed at room temperature, kneaded at 90 to 110°C, and cooled.
It was crushed to obtain a phenolic resin molding material. The obtained molding material was molded and cured by compression molding and injection molding in a mold heated to 170°C to obtain a molded product. Various properties of this molded article were measured and are shown in Table 1.

Example 2 40% novolak type phenolic resin, 5% xylene modified phenolic resin, 7% hexamethylenetetramine,
Mix 20% glass fiber, 10% cotton flock, 10% potassium octatitanate, and 8% other additives at room temperature,
After kneading at ~110°C, the mixture was cooled and pulverized to obtain a phenolic resin molding material. A molded article was made from the obtained molding material in the same manner as in Example 1, and its properties were measured and are shown in Table 1.

Example 3 50% resol type phenolic resin, 15% glass fiber,
A molding material was obtained using 15% cotton woven fabric, 15% potassium octitanate, and 5% other additives in the same manner as in Example 1, and then a molded article was made and its properties were measured and are shown in Table 1.

Comparative Example 1 A molding material was obtained in the same manner as in Example 1 using 50% novolac type phenolic resin, 8% hexamethylenetetramine, 35% wood flour, and 7% other additives, and then a molded article was prepared. The characteristics were measured and are shown in Table 1.

Comparative Example 2 40% resol-type phenolic resin, 10% xylene-modified phenolic resin, 15% glass fiber, 15% cotton woven fabric, 15% kaolin clay, and 5% other additives were molded in the same manner as in Example. I got the material. Next, a molded article was made and its properties were measured and are shown in Table 1. It was recognized that the present invention is superior in all cases.

[0021]

[Table 1] ◎ mark: Particularly good, ○ mark: Good, △ mark: Slightly poor, × mark...
Inferior.

[0022]

Effects of the Invention As is clear from the above explanation and Table 1, the phenolic resin molding material of the present invention has high heat resistance, high mechanical strength, excellent wear resistance and electrical properties, and has extremely well-balanced properties. It is a good molding material.

Claims (2)

[Claims] Claim 1: (a) selected from phenolic resins, xylene resins and xylene-modified phenolic resins
A phenolic resin molding material characterized in that its main components are one or more resins, (b) glass fiber, (c) natural organic fiber, and (d) potassium titanate. [Claim 2] Glass fiber 5 to 4 for the molding material
The phenolic resin molding material according to claim 1, containing 0% by weight, 5-30% by weight of natural organic fibers, and 1-30% by weight of potassium titanate.