JPS5968334A - Manufacturing method for polyamide resin molded products - Google Patents

Abstract

PURPOSE:To mold and cure a heat-resistant resin molding in a short time, by blending a radiation-polymerizable unsaturated monomer and a radical polymn. inhibitor with a polyamide resin, molding the mixture and irradiating the molding with a radiation. CONSTITUTION:A monomer having a radiation-polymerizable unsaturated double bond, such as diethylene glycol dimethacrylate, a radical polymn. inhibitor such as hydroquinone and a polyamide resin such as nylon 12 are blended together. The mixture is molded into the desired shape, and the molding is irradiated with a radiation to cure it, thus producing the desired polyamide resin molding. By incorporating the monomer having unsaturated double bonds and carrying out irradiation, heat distortion resistance can be greatly improved so that the shape can be retained even when temp. exceeds the m.p. of the polyamide resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a heat-resistant resin molded product, which can cure and mold a polyamide resin whose heat resistance is poor in a short time.

Conventionally, electrical insulating parts that require heat resistance, such as plugs, connectors, and switches used in electric heating appliances, must not melt or deform even at high temperatures, and are made using thermosetting resins such as Bakelite, melamine resin, or engineering resins. Polyamide resin, called plastic, is made by mixing glass fiber with nylon resin to give it heat resistance. However, thermoset resins need to be heated and cured in a mold for a certain period of time, so they cannot be processed in a short time, and their electrical withstand voltage and insulation b' properties are not very good.
Water resistance, chemical resistance, etc. are also inferior to thermoplastic engineering plastics.

On the other hand, thermoplastic 1 cow engineering plasticine is
Although glass fibers were mixed in to improve heat resistance, there was a problem that they would melt if heated above the melting point or heat distortion temperature for a long time.

The present invention is 1) a new invention that eliminates the drawbacks mentioned in IJ, and uses a thermoplastic resin with good heat resistance and maintains its shape even at temperatures above the melting point of the resin.
141E (The purpose is to provide a method for manufacturing Mj resin molded products.

In order to achieve this objective, the present invention combines a monomer having an unsaturated double bond that polymerizes with radiation and a radical polymerization inhibitor into a polyamide resin, and after molding it into a predetermined shape,
The present invention is a method for producing a heat-resistant resin molded product, which comprises curing the molded product by irradiating the molded product with radiation.

A detailed explanation will be given below using examples.

Polyamides are easily polymerized by radiation, such as monomers such as dimecacrylic acid diethylene glycol ester, and radical polymerization inhibitors (to prevent the polymerization of these monomers) during storage or molding of the monomers. For example, benzoquinone, etc.) is blended and fed to an index molding machine,
A polyamide resin molded product is molded under predetermined heating and molding conditions. Set up the molding machine.

In addition to the injection molding method described above, various molding methods can be used as the molding method. As Matamotsuma, the above-mentioned diethylene glycol dimekkurire-1
・In addition to diethylene glycol diacrylate, ethylene glycol diacrylate, ethylene glycol diacrylate, triethylene glycol diacrylate, triethylene glycol diacrylate, divinylbenzene, l-lylyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate. Acrylate, trimethylolpropane trimecacrylate,・-t,
Examples of radical polymerization inhibitors for preventing monomer polymerization include glycerol trimecrylate, allyl acrylate, allyl acrylate, shea, lyl icconate, sia 7lyl fumale 1-1l-lylylphosphate, and dibrobagil maleate. , pyriphosphoric acid, l-
Linitrobenzene, 2,5-dioxy-14,-benzoquinone, 14-naphthoquinone, 1,5-benzoquinone,
Chloranil, 910-phenanthraquinone, tert
-butylcatechol, 1-amino-1-naphthol, hel:roquinone, phenyl-β-+phthylamine, and the like.

Polyamide resins include 12 nylon, 1G nylon, 66 nylon, 6.10 nylon, 612 nylon, and modified products thereof, which are blended with appropriate amounts of antioxidants, flame retardants, pigments, and the like.

Next, we will give an example of 12# nylon. The interest rates A, B, and C of the mixture shown in Table 1 are +1110 mm x thickness 2.
wm x length 50 m, molded into a rod shape of m, 2 MeV
The sample was irradiated with 5 Mrad using an electron beam accelerator of
After applying a load of Kg and leaving it for 1 hour, the deformation meter was dtl.
I decided. The results are shown in Table 2, and as can be seen from the results, molded products of polyamide (12 nylon) resins A and B containing monomers with unsaturated double bonds were Even when the heat deformation resistance exceeds the melting point of nylon 12 (180°C), it is significantly improved. On the other hand, it can be seen that those without irradiation or containing monomers with unsaturated C double bonds cannot maintain their shape at all when heated above their melting point.

As described in detail below, the present invention is for molding a synthetic resin blended with a monomer having unsaturated double bonds, and can be molded quickly and easily using an ordinary injection molding machine.
Furthermore, by using an electron beam accelerator for radiation irradiation, it is possible to provide a method for manufacturing heat-resistant resin molded products with good production efficiency, such as being able to cure in just a few seconds.

Note that 7I41J amide) uJ produced by this production method
II molded products have good dimensional stability, so transformer J
1.1 Half of urethane coated wire that can be wound around a transformer even when used for T4 bobbin etc. Urethane removal temperature by I (4・5
0°C for 12 to 5 seconds).

Claims (1)

[Claims] A polyamide characterized by blending a monomer having an unsaturated double bond that polymerizes with radiation and a radical polymerization inhibitor into a polyamide resin, molding it into a predetermined shape, and then curing the molded product by irradiating it with radiation. Manufacturing method for resin molded products