JPH0468049A - Amino resin molding material - Google Patents

Abstract

PURPOSE:To prepare the title material contg. no filler and giving a molded article excellent in gloss, water resistance, strengths, etc., by compounding a solid amino resin having a specified methylol group content with a curing agent, a mold release agent, and, if necessary, a colorant. CONSTITUTION:A solid amino resin having a methylol group content of 20-80wt.% is prepd., e.g., by thermally reacting an amino compd. such as urea, melamine, or guanamine with formaldehyde and thermally dehydrating the resulting liq. amino resin under a reduced pressure to solidify it. The solid amino resin is compounded with a curing agent (e.g. phthalic anhydride), a mold release agent (e.g. zinc stearate), and, if necessary, a colorant, giving the title material contg. no filler. The material is suitably used for a wiring tool, an electric appliance, a household article, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an amino resin molding material used for wiring devices, electrical appliances, kitchen appliances, household goods, etc.

[Conventional technology]

Conventionally, molded products obtained from amino resin molding materials have been used for electrical appliances, wiring devices, household goods, etc. due to their excellent arc resistance, tracking resistance, electrical insulation, heat resistance, colorability, surface hardness, solvent resistance, etc. However, since pulp is used as the base material, there are problems with gloss, water resistance, and strength.

[Problem that the invention seeks to solve]

As mentioned in the conventional technology, amino resin molded products have gloss,
There were problems with water resistance and strength. The present invention has been made in view of the above-mentioned problems in the prior art, and its purpose is to provide an amino resin molding material from which molded products with excellent gloss, water resistance, and strength can be obtained.

[Disclosure of the invention]

The present invention is an amino resin characterized in that it is a non-filler obtained by adding a curing agent, a mold release agent, and, if necessary, a coloring agent to a solid amino resin having a methylol group content of 20 to 80% by weight. Since the molding material is a non-filler, gloss, water resistance, and strength can be improved, and the present invention will be described in detail below.

The solid amino resin used in the present invention is a solidified liquid amino resin made by adding formaldehyde to an amino compound such as urea, melamine, or guanamine, and contains 120 to 80% by weight of methylol groups (hereinafter simply referred to as %). ). That is, the methylol group content is 20%.
If it is less than 80%, the gloss will decrease, and if it exceeds 80%, the strength and water resistance will decrease. More preferably, the amount of volatilization after heating and drying the solid amino resin at 180°C for 20 minutes is 3 to 3.
It is desirable that it be 15%. That is, if it is less than 3%, gloss tends to decrease, and if it exceeds 15%, strength and water resistance tend to decrease. Adding 1.2 to 1.6 mol of aldehyde to 1 mol of the above solid amino compound,
P) It is obtained by dehydrating the liquid amino resin obtained by reacting 18 to 9 at 100 to 120°C under reduced pressure. Solid amino resin The amino resin alone may be used, but it may also be a modified amino resin such as epoxy-modified or phenol-modified.The curing agent is hexamine, phthalic anhydride, etc. It is preferable to add 0.01 to 3 parts to 100 parts of resin, and it is preferable to use fatty acids, fatty acid metal salts, etc. as the mold release agent, and add 0.05 to 5 parts to 100 parts of resin. The amino resin molding material thus obtained can be heated and pressure molded by compression molding, extrusion molding, transfer molding, injection molding, etc. to obtain a transparent molded product. Conditions for hot-press molding vary depending on the molding method and are not particularly limited, but it is preferable that the mold temperature is 130 to 180° C. and the molding pressure is 100 to 400 kg/c+fl.

The present invention will be explained below based on examples.

Example 1.4 mol of formaldehyde was added to 1 mol of melamine, and the resulting liquid melamine resin was reacted at 110°C for 60 minutes at pH 8.5.
A solid melamine resin was obtained by heating and dehydrating under reduced pressure at rr. Next, 0.5 parts of phthalic anhydride and 2 parts of zinc stearate were added to 100 parts of the pulverized solid melamine resin to obtain a melamine resin molding material.

Comparative Example: 1 pulp per 200 parts of liquid melamine resin, same as in Example.
00 parts, 0.5 parts of phthalic anhydride, and 2 parts of zinc stearate were added, mixed, dried, and pulverized to obtain a melamine resin molding material.

Comparative Example: 1 pulp per 200 parts of liquid melamine resin, same as in Example.
00 parts, 0.5 parts of phthalic anhydride, and 2 parts of zinc stearate were added, mixed, dried, and pulverized to obtain a melamine resin molding material.

The melamine resin molding materials of Examples and Comparative Examples were molded under a molding pressure of 2.
A molded product was obtained by compression molding at 50 kg/c for 2 minutes at a mold temperature of 150°C, and the performance of this molded product was measured.
It looked like a table.

Table 1 The present invention is constructed as described above. The amino resin molding material having the structure described in the claims has the effect of providing molded products with excellent gloss, water resistance, and strength.

Claims (1)

[Claims] (1) An amino resin characterized by being a non-filler obtained by adding a curing agent and a mold release agent to a solid amino resin having a methylol group content of 20 to 80% by weight, and further adding a coloring agent as necessary. Molding material.