JPH05230333A - Melamine resin molding material - Google Patents

Abstract

PURPOSE:To obtain the subject molding material meeting the Food Sanitation Law, excellent in transparency, water resistance and resistance to contamination, useful for kitchen equipment, wiring utensils, etc., by impregnating a glycidyl- modified melamine resin in cellophane followed by drying and then addition of a curing agent etc. CONSTITUTION:The objective molding material can be obtained by (A) impregnating a glycidyl-modified melamine resin in pref. 20-50wt.%, based on the resin, of cellophane followed by drying and then (B) incorporation of pref. 0.01-3 pts.wt., based on 100 pts.wt. of the resin, of a curing agent such as phthalic anhydride and pref. 0.01-5 pts.wt., based on 100 pts.wt. of the resin, of a releasant such as a metal salt of fatty acid, and, as necessary, colorant etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melamine resin molding material used for molded articles requiring transparency, such as wiring appliances, electric appliances, kitchen appliances, household articles and miscellaneous goods.

[0002]

2. Description of the Related Art Conventionally, molded products made of urea resin and melamine resin are useful because they are hard and have high stain resistance, but transparent molded products can be obtained with urea resin molding materials. In addition, it cannot be used as tableware, and a transparent molded product cannot be obtained with a melamine resin molding material.

[0003]

As described in the prior art, it is not possible to obtain a transparent molded product from a melamine resin molding material. The present invention has been made in view of the above problems in the prior art, and an object thereof is to provide a melamine resin molding material from which a transparent molded product can be obtained.

[0004]

The present invention is characterized in that cellophane is impregnated with a glycidyl-modified melamine resin, dried, and then a curing agent, a release agent, and if necessary, a coloring agent and the like are added. Since the melamine resin molding material can achieve the above object, the present invention will be described in detail below.

The melamine resin used in the present invention contains 1.2 to 3 mol of formaldehyde and PH8 per mol of melamine.
The melamine resin obtained by reacting at -12 to 60 to 95 ° C is modified with a glycidyl compound, preferably a glycidyl ether epoxy resin. The modification with the glycidyl compound is 5 to 40% by weight of the melamine resin (hereinafter simply referred to as
It is preferable that it is 10 to 30%. For the modification, the melamine resin and the glycidyl compound are added to 60-
It is denatured by heating at 150 ° C. for 0.5-4 hours. This is because if the amount of the glycidyl compound is less than 5%, the transparency tends to decrease, and if it exceeds 40%, the appearance of the molded product tends to deteriorate. Cellophane is not particularly limited, and cellophane in general can be used. The addition amount of cellophane is preferably 20 to 50% of the resin. That is, if it is less than 20%, the drying property tends to deteriorate, and if it exceeds 50%, the flow during molding tends to be small and the moldability tends to deteriorate. As a curing agent, phthalic anhydride or the like is used, and it is preferable to add 0.01 to 3 parts by weight to 100 parts by weight of the resin (hereinafter simply referred to as “part”). As the release agent, fatty acid, fatty acid metal salt,
0.01 to 5 per 100 parts of resin using wax
Partial addition is preferred. In the present invention, cellophane serves as a filler, so that pulp, wood powder, etc. which have been conventionally used as a filler are not used. Further, a colorant is added if necessary. Thus, the above materials are blended, mixed, kneaded,
A melamine resin molding material is obtained by pulverizing and further granulating if necessary. The molding material is molded by compression molding, transfer molding, injection molding or the like.

The present invention will be described below based on examples.

[0007]

Example: Formaldehyde 1. to 1 mol melamine.
To 80 parts of a melamine resin obtained by adding 6 mol and reacting at 85 ° C. for 1 hour with PH9, 20 parts of a glycidyl ether epoxy resin was added and heated at 90 ° C. for 30 minutes to obtain an epoxy-modified melamine resin. Next, 40 parts of cellophane, 0.3 parts of phthalic anhydride, and 0.05 parts of zinc stearate were mixed with 60 parts of the epoxy-modified melamine resin, mixed, kneaded, and pulverized to obtain a melamine resin molding material. Next, the molding material was molded using a transfer molding machine at a mold temperature of 145 ° C. and a molding pressure of 100 Kg / cm ^{2 for a} curing time of 3 minutes to obtain a molded product having a thickness of 1 mm.

[0008]

Comparative Example 1 A melamine resin molding material and a molded product were obtained by the same treatment as in Example except that 40 parts of pulp was used instead of 40 parts of cellophane.

[0009]

[Comparative Example 2] A melamine resin molding material and a molded article were prepared in the same manner as in Example except that 60 parts of urea resin was used instead of 60 parts of epoxy-modified melamine resin and 40 parts of pulp was used instead of 40 parts of cellophane. Obtained.

The performances of the example and the comparative examples 1 and 2 are shown in Table 1.

[0011]

The present invention is constructed as described above.
It was confirmed that the melamine resin molding material having the structure described in the claims has good transparency and water resistance, and was excellent in the present invention.

Claims (1)

[Claims] 1. A melamine resin molding material comprising a cellophane impregnated with a glycidyl-modified melamine resin, dried, and then added with a curing agent, a release agent, and if necessary, a coloring agent.