JPH09137039A - Melamine resin molding material and molded product thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a melamine resin excellent in dimensional stability after heat treatment and molded products therefrom. SOLUTION: The first melamine resin molding material contains a melamine resin, a filler, and a curing agent, in addition, polyethylene glycol and polyethylene glycol diglycidyl ether together. The second melamine resin molding material contains a melamine resin, a filler, and a curing agent, in addition, polyethylene glycol and polypropylene glycol glycidyl ether together. The molded products are prepared by using the first or second melamine resin molding material.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a melamine resin molding material and a molded product thereof.

[0002]

2. Description of the Related Art Melamine resins are obtained by a condensation reaction between melamine and formaldehyde. A melamine resin molding material is obtained by adding a filler, a release agent, a curing agent and the like to the obtained melamine resin varnish. The melamine resin molding material is a thermosetting resin molding material and is excellent in mechanical strength, electrical characteristics, and colorability, and thus has been used in various applications from the past, for example, various electric parts such as wiring equipment and electric equipment and tableware. It is widely used as a material for This melamine resin molding material is injection molded by an injection molding machine or the like to obtain various molded products. The characteristics required for these molded products are not only good appearance, but also dimensional stability after heat treatment, that is, reduction in dimensional change rate after heat treatment. In order to satisfy these requirements, a method of aging the molded product has been required. According to such a method for manufacturing a special molded product, the manufacturing process is complicated, the processing time is long, and the manufacturing is difficult.

Therefore, it has been proposed to add polyethylene glycol diglycidyl ether to the above constituent materials, but in the field of electric parts in recent years, further dimensional stability after heat treatment is required.

[0004]

The present invention has been made in view of the above facts, and an object thereof is to provide a melamine resin molding material excellent in dimensional stability after heat treatment and a molded product thereof. Especially.

[0005]

A melamine-based resin molding material according to claim 1 of the present invention is a melamine resin molding material containing a melamine resin, a filler, and a curing agent. It is characterized in that it contains both glycol and polyethylene glycol diglycidyl ether.

A melamine-based resin molding material according to claim 2 of the present invention is a melamine resin molding material containing a melamine resin, a filler, and a curing agent, wherein the above-mentioned constituent materials, polyethylene glycol, and polypropylene glycol are used. It is characterized in that it also contains diglycidyl ether.

The molded product according to claim 3 of the present invention is characterized by being molded using the melamine resin molding material according to claim 1 or 2.

Polyethylene glycol, which is a constituent material of the above melamine resin molding material, has OH groups at both ends, and since these OH groups are dispersed between the resins without reacting with amino groups, heat shrinkage occurs due to the alloy effect. It is speculated that the rate can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

The melamine resin molding material according to claim 1 of the present invention contains a melamine resin, a filler, and a curing agent. The melamine resin is a melamine resin initial condensate obtained by subjecting melamine and formaldehyde to a condensation reaction. Examples of the filler include pulp and glass fiber,
Examples of the curing agent include phthalic anhydride.

It is essential that the melamine resin molding material of the present invention contains polyethylene glycol (hereinafter referred to as PEG) and polyethylene glycol diglycidyl ether (hereinafter referred to as PEGE) in addition to the above constituent materials. . PEGE effectively functions to make PEG sufficiently compatible with melamine resin. Further, the PEG has OH groups at both ends, and it is presumed that the thermal contraction rate can be reduced by the alloy effect if the OH groups are dispersed between the resins without reacting with the amino groups. Although the content of the PEG is not limited, it is preferably 1 to 6% by weight in the molding material, and the content of PEGE is also preferably 1 to 6% by weight in the molding material.

As a constituent material of the melamine resin molding material of the present invention, a releasing agent such as zinc stearate or a coloring agent such as a pigment may be used together with the above materials, if necessary.

The melamine resin molding material is obtained by, for example, dehydrating and solidifying the melamine resin initial condensate with a dehydrating dryer or the like to obtain a melamine solid resin, and then using a filler, a curing agent, PEG, PEGE, and a releasing agent. The compounded product obtained by adding the mold agent and the like can be obtained by mixing and dispersing, kneading and granulating with a ball mill, a kneader or the like.

The melamine resin molding material according to claim 2 of the present invention is the same as above, and the melamine resin, the filler, and
Contains a curing agent.

It is essential that the melamine resin molding material of the present invention contains polyethylene glycol (hereinafter referred to as PEG) and polypropylene glycol diglycidyl ether (hereinafter referred to as PPGE) together with the above constituent materials. . PPGE effectively functions to make PEG sufficiently compatible with melamine resin. Further, the PEG has OH groups at both ends, and it is presumed that the thermal contraction rate can be reduced by the alloy effect if the OH groups are dispersed between the resins without reacting with the amino groups. Above PEG
Content in the molding material is not limited, but is 1 to 6% by weight.
Is preferable, and the content of PPGE is also preferably 1 to 6% by weight in the molding material.

In the melamine resin molding material, a release agent such as zinc stearate and a coloring agent such as a pigment may be used together with the above materials, if necessary.

A molded product according to claim 3 of the present invention is molded using the melamine resin molding material according to claim 1 or 2. The molded product may be molded using, for example, an injection molding machine. Since the above-mentioned molded article has little dimensional shrinkage due to heat, it is effective for various electric parts such as wiring equipment and electric equipment.

[0018]

【Example】

(Examples 1 to 3, Comparative Examples 1 to 3) Example 1 Melamine solid resin (manufactured by Matsushita Electric Works, Ltd .: trade name CP901)
2) 60 parts by weight, 10 parts by weight of glass fiber (manufactured by Nippon Glass Fiber Co., Ltd .: trade name ESC03B), 30 parts by weight of powder pulp,
0.5 parts by weight of phthalic anhydride and 1.2 parts by weight of zinc stearate are mixed, and PEG is 3% by weight with respect to the entire molding material and PEGE is 5% by weight with respect to the entire molding material.
Added to obtain a blended product.

The resulting blended product was mixed by a ball mill for 1 hour to prepare a mixed powder, and then the temperature was set to 90 by a uniaxial extruder.
The mixture was kneaded at ˜110 ° C., and the kneaded product was pulverized and granulated with a pulverizer to obtain a melamine resin molding material.

Example 2 A melamine resin molding material was obtained in the same manner as in Example 1 except that PEG of Example 1 was blended in an amount of 1.5% by weight based on the whole molding material.

Example 3 A melamine resin molding material was obtained in the same manner as in Example 1 except that PEG of Example 1 was blended in an amount of 5% by weight based on the whole molding material.

Comparative Example 1 Melamine solid resin (trade name CP901 manufactured by Matsushita Electric Works, Ltd.)
2) 60 parts by weight, 10 parts by weight of glass fiber (manufactured by Nippon Glass Fiber Co., Ltd .: trade name ESC03B), 30 parts by weight of powder pulp,
0.5 parts by weight of phthalic anhydride and 1.2 parts by weight of zinc stearate were mixed, and 3% by weight of PEG was added to the entire molding material to obtain a blended product. After that, Example 1
A melamine resin molding material was obtained in the same manner as.

Comparative Example 2 Melamine solid resin (trade name CP901 manufactured by Matsushita Electric Works, Ltd.)
2) 60 parts by weight, 10 parts by weight of glass fiber (manufactured by Nippon Glass Fiber Co., Ltd .: trade name ESC03B), 30 parts by weight of powder pulp,
0.5 parts by weight of phthalic anhydride and 1.2 parts by weight of zinc stearate were mixed, and 5% by weight of PEGE was added to the entire molding material to obtain a blended product. Thereafter, a melamine resin molding material was obtained in the same manner as in Example 1.

Comparative Example 3 Melamine solid resin (trade name CP901, manufactured by Matsushita Electric Works, Ltd.)
2) 60 parts by weight, 10 parts by weight of glass fiber (manufactured by Nippon Glass Fiber Co., Ltd .: trade name ESC03B), 30 parts by weight of powder pulp,
A mixture was obtained by mixing 0.5 parts by weight of phthalic anhydride and 1.2 parts by weight of zinc stearate. After that, Example 1
A melamine resin molding material was obtained in the same manner as.

(Evaluation of Examples 1 to 3 and Comparative Examples 1 to 3) The heat shrinkage rates of the molded articles made from the obtained melamine resin molding materials of Examples 1 to 3 and Comparative Examples 1 to 3 were evaluated. .

The resulting melamine resin molding material was injection molded using an injection molding machine to obtain a JIS test piece as a molded product for measuring the dimensional change rate after heat treatment. Using this molded product, heat treatment was performed at 150 ° C. for 168 hours, and the dimensional change rate (shrinkage rate) before and after the heat treatment was measured by JI.
It was measured based on SK-6911. As shown in Table 1, the results are as follows:
3 to 3 were all as good as 0.35 to 0.68.

[0027]

[Table 1]

(Examples 4 to 5 and Comparative Example 4) Example 4 Melamine solid resin (trade name CP901 manufactured by Matsushita Electric Works, Ltd.)
2) 60 parts by weight, 10 parts by weight of glass fiber (manufactured by Nippon Glass Fiber Co., Ltd .: trade name ESC03B), 30 parts by weight of powder pulp,
0.5 parts by weight of phthalic anhydride and 1.2 parts by weight of zinc stearate are mixed, and PEG is 3% by weight and the PPGE is 5% by weight with respect to the entire molding material.
Added to obtain a blended product. Thereafter, a melamine resin molding material was obtained in the same manner as in Example 1.

Example 5 A melamine resin molding material was obtained in the same manner as in Example 4 except that PEG of Example 4 was blended in an amount of 1.5% by weight based on the whole molding material.

Comparative Example 4 Melamine solid resin (manufactured by Matsushita Electric Works, Ltd .: trade name CP901)
2) 60 parts by weight, 10 parts by weight of glass fiber (manufactured by Nippon Glass Fiber Co., Ltd .: trade name ESC03B), 30 parts by weight of powder pulp,
0.5 parts by weight of phthalic anhydride and 1.2 parts by weight of zinc stearate were mixed, and 5% by weight of PPGE was added to the entire molding material to obtain a blended product. Thereafter, a melamine resin molding material was obtained in the same manner as in Example 4.

(Evaluation of Examples 4 to 5 and Comparative Examples 1 and 4) The heat shrinkage ratios of the molded articles made of the obtained melamine resin molding materials of Examples 4 to 5 and Comparative Examples 1 and 4 are as described above. It evaluated similarly. As shown in Table 2, the result is 0.82 in the comparative example.
In contrast to 0.99%, all of Examples 4 to 5 have 0.37 to
It was a good 0.47.

[0032]

[Table 2]

[0033]

The melamine-based resin molding material according to claim 1 of the present invention contains both PEG and PEGE as constituent materials. Therefore, when the melamine resin molding material of the present invention is used, dimensional stability after heat treatment is obtained. It is possible to obtain a molded product having excellent properties.

Since the melamine-based resin molding material according to claim 2 of the present invention contains both PEG and PPGE as constituent materials, the use of the melamine resin molding material of the present invention provides excellent dimensional stability after heat treatment. A molded product can be obtained.

Since the molded product according to claim 3 of the present invention uses the above-mentioned melamine resin molding material, it has excellent dimensional stability after heat treatment.

Claims (3)

[Claims] 1. A melamine resin molding material containing a melamine resin, a filler, and a curing agent, the composition material comprising:
A melamine resin molding material containing both polyethylene glycol and polyethylene glycol diglycidyl ether. 2. A melamine resin molding material containing a melamine resin, a filler, and a curing agent, the constituent material comprising:
A melamine resin molding material containing both polyethylene glycol and polypropylene glycol diglycidyl ether. 3. A molded article, which is molded using the melamine resin molding material according to claim 1 or 2.