JPH0751658B2 - Phenolic resin composition for molding and phenolic resin molded product - Google Patents

Description

TECHNICAL FIELD The present invention relates to a molding phenol resin composition, and in particular, shows an excellent reinforcing effect by bast fibers, and individual molded products by colored bast fibers. The present invention relates to a molding phenol resin composition capable of imparting a unique decorative pattern.

The resin composition according to the present invention is difficult to apply not only in conventional phenol resin molded products, but particularly in conventional ordinary natural fiber-reinforced phenolic resin in terms of strength, particularly in terms of strength against repeated impact force. Further, it can be particularly suitably used for various sports equipment parts, ornaments requiring mechanical strength, and the like, for example, golf club heads, gate ball club heads, handles for western umbrellas, and the like.

[Conventional technology and its problems]

Conventionally, it is well known to use natural cellulosic materials such as wood powder, cotton woven cloth strips and cellulosic pulses as a reinforcing agent for phenolic resin molding materials.

However, although the phenol resin molded product reinforced with these reinforcing materials is excellent in heat resistance and static mechanical strength, it is insufficient in strength, for example, for golf club heads to which repeated impacts are applied, and therefore, it cannot be applied. Was considered difficult. Also, when asbestos is used as a reinforcing material, it is far superior to natural fiber-based reinforcing materials in terms of heat resistance and mechanical strength, but asbestos is prohibited because it is dangerous to the human body. Has reached.

In view of the above circumstances, the present inventors have examined various aspects of the reinforcing material for the phenolic resin for molding, and the so-called bast fibers such as 杮, 椏, goose bark of natural cellulosic materials that have been commonly used in the past. It has been found that it is extremely excellent in dynamic mechanical strength, especially in repeated impact force, as compared with the fiber type reinforcing material.

That is, the present invention provides a molding phenol resin composition capable of providing a molded product which is excellent in mechanical strength, which is particularly difficult to obtain with a normal natural fiber reinforced phenol resin molding material, particularly strength against repeated impact force. It is in.

[Means for Solving the Problems]

The present invention is a reinforcing material as a result of diligent examination from a multifaceted point of view of mechanical strength of a molding phenol resin composition having a conventional wood fiber as a reinforcing material, particularly repeated impact strength, and improvement of appearance of a molded product. As a result, it has been found that by using a beaten product of bast fibers such as Japanese pomegranate, Sanpei or goose bark, a molded product having excellent mechanical strength and a unique spot pattern due to a flow pattern on the surface of the molded product can be obtained.

That is, the present invention is a resol type phenolic resin 30-70
40 to 60 parts of fibers selected from the group consisting of parts, beaten sardines, san tsubaki and goose bark, and 0 to 20 parts of other organic fillers,
And a molding phenol resin composition containing 1 to 3 parts of a colorant.

The present invention, beaten sardines, Sanbori or goose bark and other bast fibers are impregnated with a solution type resole phenolic resin, mixed with a pigment, and dried to obtain a molding composition by transfer molding or It is made into a molded product by compression molding.

The molded product obtained in this manner has excellent mechanical strength, which is not obtained with conventional wood-based fibers, particularly excellent repeated impact strength, and exhibits a unique mottled pattern on the surface of the molded product.

The bast fibers such as pomegranate, Sansho or goose bark used in the present invention are the same as conventional wood fibers in that the main component thereof is cellulose, but the degree of polymerization and crystallinity of the cellulose are wood fibers. It is much larger than fiber and has less lignin content that adversely affects strength compared to wood fiber, and has a large content of hemicellulose, which is easily fibrillated during beating, and is easily fibrillated. As a result, the affinity with the phenol resin, which is the matrix resin, is large, and the aspect ratio is larger than that of ordinary wood-based fibers.

The resol type phenolic resin used in the present invention is a liquid type and has a viscosity of about 800 to 1200 cps at room temperature. Usually, a methanol solution type having a solid content of about 60 to 70% is preferably used. In the present invention, if necessary, novolac type phenolic resin, epoxy resin,
An elastomer or the like can be added. In the case of obtaining an article or a part which further requires heat resistance, a novolac type phenol resin or an epoxy resin can be added in the range of 5 to 50 parts with respect to 100 parts of the resol type phenol resin. If elasticity is required,
An elastomer such as nitrile rubber or MBS or a rubber-modified phenol resin can be added in the range of 1 to 10 parts per 100 parts of the resol type phenol resin.

As the other organic filler used in the present invention, conventional wood powder, cotton woven cloth strips, cotton powder, wood fiber such as pulp is used, and the amount thereof is usually 0 to 20 parts, It is preferably 0 to 10 parts. Further, as the colorant, a pigment which is usually used for coloring a phenol resin is used as it is, and examples thereof include a phthalocyanine pigment and an azo pigment.

Further, the phenol resin composition for molding of the present invention may contain a desired amount of a curing accelerator, a release agent, etc., if necessary. As these curing accelerators and mold release agents, those which are themselves used in conventional phenol resin molding compositions can be used. Examples of the curing accelerators include calcium oxide, calcium hydroxide, magnesium hydroxide and the like. Examples of the release agent include metal stearic acid salts such as zinc stearate, calcium stearate and aluminum stearate, natural waxes such as carnauba wax and montan wax, and fatty acid amides.

The molding phenolic resin composition of the present invention generally comprises
Liquid type resol-type phenolic resin is impregnated and mixed with a beaten product of bast fibers such as citrus fruit, Sanpei or goose bark, and the mixture is mixed with a pigment, other organic filler and, if desired, a curing accelerator and A release agent or the like is added, and the mixture is mixed and kneaded for a predetermined time, dried, and then molded into a predetermined shape by transfer molding, compression molding or the like. When mixing and kneading the above-mentioned materials, a general-purpose mixing and kneading machine such as a ball mill and a Hensell mixer can be used. Further, the drying is performed at a temperature of 90 ° C. or less in a hot air circulation dryer.

Next, examples will be shown for the molding phenol resin composition according to the present invention.

Example 1 Kofu fiber 35, which had been boiled and matured with an alkali, washed with water and dried
Part, and 10 parts of softwood pulp into a Hensell mixer, and then 78.6 parts (55 parts as solid content) of methanol solution of resol-type phenol resin (viscosity 1000 cps at room temperature, resin concentration 70% by weight) and water Calcium oxide 2 parts, pigment CY
350 parts by adding 1 part of G-GB (trade name, manufactured by Dainichiseika Co., Ltd.)
After mixing and kneading at rpm for about 10 minutes and at 700 rpm for 5 minutes, the contents were taken out in a wire mesh type tray and dried in a hot air circulation dryer at 90 ° C. for 2 hours to obtain a resin composition.

The mechanical strength of a molded product obtained by compression-molding this resin composition according to JIS 6911 was measured according to JIS 6911. The results are shown in Table-1. In Table 1, the reference example is a molded product made of a resin composition in which the same amount of cotton cloth strip and wood powder are used instead of the kobu fiber.

From the above results, it can be seen that the molded product from the resin composition according to the present invention has excellent mechanical strength. In addition, the molded product from the resin composition according to the present invention has a good appearance because a deep dark green spot pattern which cannot be obtained by artificial coating is formed on the surface thereof.

Example 2 A kneaded resin composition having the same composition as in Example 1 except that C6B (trade name, manufactured by Dainichiseika Co., Ltd.) was used as the pigment instead of the pigment used in Example 1, The resin composition obtained in 1 was mixed at a ratio of 1: 1 and compression-molded. On the surface of the obtained molded product, spotted patterns in which two-colored koi fibers were alternately and randomly dispersed were developed. This appearance was completely different from the conventional two-color coating pattern, and exhibited a pattern that could not be obtained by artificial coating such as depth of color and color dispersion state.

〔The invention's effect〕

As described above, the molding phenol resin composition according to the present invention has excellent mechanical strength not obtained with conventional wood-based fibers, particularly excellent repeated impact strength, and has a unique pattern such as spots on the surface of the molded product. It is also possible to provide a molded product, and it is suitable for articles requiring mechanical strength such as high impact strength and decorativeness, particularly for sports equipment parts and leisure goods.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C08L 61:10) (C08L 61/12 61:14)

Claims (4)

[Claims] 1. A fiber 40 selected from the group consisting of 30 to 70 parts of a resol type phenolic resin, beaten citrus fruit, sanpei and gankin.
A phenol resin composition for molding, which comprises -60 parts, 0-20 parts of other organic fillers, and 1-3 parts of a colorant. 2. A novolac type phenolic resin or an epoxy resin 5 to 50 relative to 100 parts of a resol type phenolic resin.
The phenol resin composition for molding according to claim 1, wherein the phenolic resin composition for molding is formed by mixing 1 part by weight. 3. The molding phenol resin composition according to claim 1, wherein 1 to 10 parts of an elastomer or rubber-modified phenol resin is mixed with 100 parts of the resol type phenol resin. 4. A fiber 40 selected from the group consisting of 30 to 70 parts of a resol type phenolic resin, beaten citrus fruit, sanpei and gankin.
A phenol resin molded product obtained by molding a composition containing -60 parts, 0-20 parts of other organic filler, and 1-3 parts of a colorant.