JPH05230334A - Amino resin molding material - Google Patents

Abstract

PURPOSE:To obtain the subject molding material excellent in dimensional stability, impact resistance, resistance to contamination and color clearness, useful for wiring utensils, etc., by using a specific solid amino resin. CONSTITUTION:The objective molding material can be obtained by using a solid amino resin which is obtained by incorporating (A) an amino resin solution with (B) pref. 1-30 pts.wt., based on 100 pts.wt. of the resin, of a polyethylene glycol (ca.400 in polymerization degree) followed by heating ar reduced pressures to effect dehydration. This molding material is pref. incorporated with a curing agent, releasant, filler, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amino resin molding material for obtaining wiring products, electric appliances, kitchen appliances, household products, miscellaneous goods, etc., particularly moldings requiring dimensional stability and impact resistance. is there.

[0002]

2. Description of the Related Art Conventionally, molded articles made of urea resin and melamine resin are useful because they are hard and have high stain resistance, but there is a problem in that they have low dimensional stability. For this reason, a phenol resin molded product is used in this field, but there is a problem that it has no bright color.

[0003]

As described in the prior art, the amino resin molding material has a problem in that although it is possible to obtain a light-colored molded product, the dimensional stability is low.
The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide an amino resin molding material from which a molded article having excellent dimensional stability can be obtained.

[0004]

Means for Solving the Problems The present invention is an amino resin molding material characterized by using a solid amino resin obtained by adding polyethylene glycol to an amino resin solution and then heating and dehydrating under reduced pressure. The present invention will be described in detail below.

As the amino resin used in the present invention, all amino resins such as urea resin, melamine resin and guanamine resin can be used. The amino resin was dehydrated by heating under reduced pressure after adding polyethylene glycol in the form of an amino resin solution. It is used as a solid amino resin. The amount of polyethylene glycol is preferably 1 to 30 parts with respect to 100 parts by weight of amino resin (hereinafter simply referred to as "part"). That is, if it is less than 1 part, it is difficult to improve the dimensional stability.
This is because the water resistance tends to decrease when the content exceeds the range.
The type of polyethylene glycol is not particularly limited, but it is desirable to use one having a degree of polymerization of about 4000. The amino resin also includes a modified amino resin such as epoxy modified or phenol modified. 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”). Fatty acids, fatty acid metal salts, waxes and the like are used as the release agent, and it is preferable to add 0.05 to 5 parts to 100 parts of the resin. As the filler and the reinforcing agent, pulp, wood powder, glass fiber, calcium carbonate, talc and the like are used.
Further, a colorant is added if necessary. Thus, the above-mentioned materials are blended, mixed, kneaded, pulverized, and further granulated as required to obtain an amino resin molding material. 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 1 1.6 mol of formaldehyde was added to 1 mol of melamine, and 100 parts of a melamine resin solution obtained by reacting at 85 ° C. for 1 hour with PH9 was added with polyethylene glycol (PEG 4000, Sanyo Kasei Co., Ltd.). Two
After adding and dispersing parts, the mixture was heated and dehydrated under reduced pressure at a vacuum degree of 100 TORR to obtain a solid modified melamine resin. Next, 70 parts of the solid modified melamine resin, 30 parts of pulp, 0.3 parts of phthalic anhydride.
Parts, zinc stearate 0.8 parts and stearic acid amide 0.2 parts were mixed, mixed, kneaded and pulverized to obtain a modified melamine resin molding material. Next, using a transfer molding machine, the molding material is subjected to a mold temperature of 145 ° C. and a molding pressure of 100 kg.
/ Cm ² curing time was 3 minutes to obtain a molded product.

[0008]

Example 2 A modified melamine resin molding material and a molded product were obtained in the same manner as in Example 1 except that the amount of polyethylene glycol in Example 1 was changed to 15 parts.

[0009]

Example 3 A modified melamine resin molding material and a molded article were obtained in the same manner as in Example 1 except that the amount of polyethylene glycol in Example 1 was changed to 30 parts.

[0010]

[Comparative Example] A modified melamine resin molding material and a molded product were obtained in the same manner as in Example 1 except that the polyethylene glycol of Example 1 was not used.

The performances of Examples 1 to 3 and Comparative Example are as shown in Table 1. The post-shrinkage ratio is the dimensional change ratio after the molded product is treated at 110 ° C. for 7 days.

[0012]

The present invention is constructed as described above.
It was confirmed that the amino resin molding material having the structure described in the claims has good dimensional stability and is excellent in the present invention.

Claims (1)

[Claims] 1. An amino resin molding material comprising a solid amino resin obtained by adding polyethylene glycol to an amino resin solution and then dehydrating under reduced pressure.