JPH07157636A - Phenol resin molding material - Google Patents

Abstract

PURPOSE:To obtain a phenol resin molding material which gives a coated molding excellent in adhesion between the substrate and the coating film without detriment to mold release characteristics. CONSTITUTION:This molding material is prepd. by compounding a phenol resin compsn. comprising 100 pts.wt. phneol resin, 10-90 pts.wt. org. ingredients, and 0-70 pts.wt. inorg. ingredients with a mold release agent comprising 0.2-4 pts.wt. higher alcohol having an m.p. of 50-70 deg.C) (e.g. stearyl alcohol) alone or together with 0.1-4 pts.wt. higher fatty acid having an m.p. of 40-80 deg.C (e.g. stearic acid).

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 capable of obtaining a molded article having good coating adhesion.

[0002]

BACKGROUND OF THE INVENTION Phenolic resin molding materials are used in heavy electrical fields, electrical parts,
It is widely used in various molded products such as kitchen parts, lacquerware substrates, automobile ashtrays, etc.
I am painting. Such a coated molded product has a problem that the coating film peels off when it is used at room temperature or high temperature and high humidity, or when the molded product is coated after being stored for a long time, the paint pops off and is not coated. ing. Therefore, conventionally, the amount of the release agent blended is reduced or a high melting point (180 to 220 ° C.) release agent such as barium stearate or sodium stearate is blended. Although coating adhesion of these materials is improved, it has not reached the point where the coating film does not peel off, and there are also problems such as poor release from the mold during molding of the molded product. The current situation.

[0003]

SUMMARY OF THE INVENTION The object of the present invention is to blend a specific mold release agent in combination so as to prevent the paint from popping even after coating the molded product after long-term storage or to prevent the coating film from being coated. Another object of the present invention is to provide a phenol resin molding material which does not peel off and does not peel off the coating film even if the coated formed product is used for a long time under high temperature and high humidity.

[0004]

The present invention relates to 100 parts by weight of a phenol resin, wood powder, pulp, coconut husk powder,
Phenolic resin composition comprising 10 to 90 parts by weight of organic base material such as chaff powder, crushed cloth, laminated plate powder, plywood powder and inorganic base material such as calcium carbonate, clay, glass fiber, metal hydroxide and the like. As a release agent, the melting point of 50 to 50
0.2-4 parts by weight of higher alcohol at 70 ° C., or 0.1-4 parts by weight of a releasing agent such as higher fatty acid having a melting point of 40-80 ° C. blended, and phenol resin molding It is a material.

In the present invention, as the phenol resin, a novolac type phenol resin is preferably used in terms of easiness of manufacturing a molding material and cost, and has a number average molecular weight of 500 to 12
It is usually used as a solid product of No. 00 because it has good moldability, but it is not particularly limited to this and may be a resol type phenol resin or a mixture of both. Further, it may be modified with xylene or alkylphenol.

The characteristic feature of the higher alcohol used in the present invention is that it has a melting point of 50 to 70 ° C. Although the intended purpose can be sufficiently achieved even if the higher alcohol is blended alone, in addition to this, it is preferable to use a release agent such as a higher fatty acid having a melting point of 40 to 80 ° C in combination with good release properties. It is preferable in terms of paintability, and its blending ratio is usually such that the melting point is 50 to 70.
Melting point is 40 to 8 with respect to 1 part by weight of higher alcohol at ℃
The release agent at 0 ° C is 0.2 to 4 parts by weight. If the amount of the latter is less than this range, the effect of adding the releasing agent is small, and if it is more than the above range, there may be a problem in paintability.

The total amount of the higher alcohol having a melting point of 50 to 70 ° C. and the releasing agent having a melting point of 40 to 80 ° C. is 0.6 to 6 parts by weight with respect to 100 parts by weight of the phenol resin, and the melting point is The blending amount of the higher alcohol at 50 to 70 ° C. is 0.2 to 4 parts by weight with respect to 100 parts by weight of the phenol resin, and the releasing agent having a melting point of 40 to 80 ° C. is 0.1 to 4 parts by weight. . If the amount of these mold release agents is less than this, the mold release from the mold at the time of molding becomes poor, and if it is more than these, mold stains occur and the appearance of the molded product is impaired.

In the present invention, examples of the higher alcohol having a melting point of 50 to 70 ° C. include stearyl alcohol,
There are heptadecyl alcohol, nonadecyl alcohol, and the like, and as the release agent having a melting point of 40 to 80 ° C., higher fatty acids such as stearic acid and palmitic acid, and carnauba wax.

The molding method for obtaining a molded product using the molding material from the phenolic resin molding material according to the present invention is not limited to transfer molding, compression molding, injection molding and the like.

[0010]

In general, phenolic resin molding materials include, in addition to phenolic resin, a curing agent, an organic base material, an inorganic base material and a linear higher fatty acid as a release agent, a linear higher fatty acid metal salt, an ester wax, or the like. Is mixed alone.
These release agents have poor compatibility with phenolic resins,
Bleed from the inside of the molded product to the surface of the molded product due to moisture in the molded product after molding or moisture due to moisture absorption. As a result, the coating adhesion becomes poor, and the coating film peels off or the coating material pops off and the coating becomes impossible.

The polarity of the higher alcohol having a melting point of 50 to 70 ° C. used in the present invention is in the middle of the polarities of the higher fatty acid and the phenol resin and has good compatibility with the releasing agent such as the phenol resin and the higher fatty acid. is there. For this reason, it is considered that the coating adhesion is excellent because the inside of the molded product does not bleed to the surface of the molded product due to the moisture in the molded product or the moisture due to moisture absorption. Further, the releasing agents such as higher alcohols and higher fatty acids used in the present invention have melting points of 50 to 70 ° C. and 40 to 80 ° C., respectively, and the normal mold temperature 1
Since the temperature is lower than 50 to 180 ° C., it is melted in the mold at the time of molding, which is also excellent in releasing from the mold and releasing from the mold.

Therefore, it is considered that the phenolic resin molding material of the present invention is excellent in coating adhesion and can be easily released from the mold during molding. When these two types of release agents are used together, the amount of each release agent can be reduced,
Since the total amount of both mold release agents may be small, stains on the mold are less likely to occur and the coatability of the molded product is further improved.

[0013]

EXAMPLES The raw materials shown in Table 1 were heat-kneaded with a mixing roll in a predetermined composition and pulverized to produce a molding material. The obtained molding material was evaluated for coating adhesion (cross-cut method) and releasability. The results are shown in the lower column of Table 1.

[0014]

[Table 1]

(Measurement method) Coating adhesion (cross-cut method): 100 bases are formed on the surface of a coated molded product with a cutter knife, and a cellophane tape is adhered onto the 1 mm square to form a cellophane tape. It is peeled off at an angle of about 30 degrees, and how many squares of 1 mm square are peeled off is measured.

Releasability: 100 × 60 in injection molding
A box-shaped molded product having a size of 50 mm was molded, and its releasability and the releasability of burrs generated in an air vent having a thickness of 0.05 mm were evaluated.

[0017]

EFFECTS OF THE INVENTION When a molded product coated with the phenolic resin molding material of the present invention is molded, a molded product excellent in coating adhesion can be obtained without impairing mold releasability. It is suitable as a resin molding material.

Claims (2)

[Claims] 1. A phenol resin composition comprising 100 parts by weight of a phenol resin, 10 to 90 parts by weight of an organic base material and 0 to 70 parts by weight of an inorganic base material, and having a melting point of 50 to 70 ° C. per 100 parts by weight of the phenol resin. Higher alcohol 0.2
A phenol resin molding material characterized by being mixed in an amount of up to 4 parts by weight. 2. A phenol resin composition comprising 100 parts by weight of a phenol resin, 10 to 90 parts by weight of an organic base material and 0 to 70 parts by weight of an inorganic base material, and having a melting point of 50 to 70 ° C. per 100 parts by weight of the phenol resin. Higher alcohol 0.2
-4 parts by weight and 0.1 to 4 parts by weight of a releasing agent such as a higher fatty acid having a melting point of 40 to 80 ° C are blended, and a phenol resin molding material.