JPS61155410A - Crosslinked fluorocarbon resin molding - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides an electronic h! This invention relates to a cross-linked fluorine-coated molded product that can be used as a container part.

[Il Tescape of Invention]

In recent years, with the development of various electronic devices, higher speed and higher performance have been required for electronic components such as relays, switches, and regulators.

For this reason, a material with a low dielectric constant and high resistance is required, and in this respect, polytetrafluoroethylene resin (PTFE) has electrical properties of low dielectric constant and high resistance, and has excellent chemical resistance and heat resistance. It can be said to be an ideal material. However, PTFE is difficult to use as a component material because it is difficult to process and lacks mpttt strength t.

On the other hand, fluororesins with excellent processability include ethylene-tetraethylene copolymer (ETFE) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP).
) etc. These fluororesins have low electrical permittivity, high resistance, and are excellent in heat resistance and chemical resistance. However, since it has a clear melting point, if it is immersed in a solder bath with a temperature higher than the melting point, such as 300''C, the molded product will be deformed, so it cannot be used as a material for electronic parts.

The present invention is based on studies aimed at retaining the shape of a fluororesin such as ETFE or FEP, which has good processability, even when heated above its melting point, such as by immersion in a solder bath at 300°C.

Generally known methods for crosslinking polymers include (1) crosslinking with organic peroxides, (2) radiation crosslinking, and (3) organic silane crosslinking. In the crosslinking of fluororesin, the melting point of the resin is as high as 260 to 270"C, and the processing temperature (30
The decomposition temperature is 400°C without decomposing even at 0 to 400°C.
Since organic peroxides such as those mentioned above generally do not exist, crosslinking using organic peroxides in (1) cannot be performed.

In addition, in (3) crosslinking with organic silane, it is necessary to graft the alkoxysilane onto the all-polyamide resin, but this method is also impossible because the alkoxysilane will volatilize at temperatures near 300°C.

So, is it possible to create a frame FR by irradiating the fluororesin with radiation? I had a hard time. Radiation includes electron beams, r-rays, etc.
Industrially, it is efficient and advantageous to use electron beam sound, so we considered a method using electron beam irradiation.

First, electron beam irradiation was performed on the fluororesin alone, but there was almost no effect, and when it was immersed in a solder bath at 350''C for 15 seconds, it completely melted.

Is that a crosslinking aid? We have thoroughly investigated the possibility of incorporating it into fluororesin. A well-known polyfunctional monomer was used as the crosslinking aid. Namely, diacrylates such as diethylene glycol diacrylate, dimethacrylates such as ethylene glycol dimethacrylate and dipropylene glycol dimethacrylate, triacrylates such as trimethylolethane triacrylate and trimethylolpropane triacrylate, and trimethylolethane trimethacrylate. , triacrylates such as trimethylolpropane trimethacrylate, triallyl ciaslate, triallyl isocyanurate, diallyl slate, diacrylphate, trimethyl methacrylic ciaslate,
These include trimethyl methacrylic isocyanurate, trimethyl acrylic cyanurate, and trimethyl acrylic isocyanurate.

After adding these crosslinking aids to the fully fluororesin, it was molded into a bobbin and irradiated with an electron beam. Thereafter, it was immersed in a solder bath at 350°C for 15 seconds. As a result, molded products using all of trimethyl methacrylic cyanurate, trimethyl methacryli isocyanurate, trimethyl acrylic cyanurate, trimethyl acrylic isocyanurate, triallyl cyanurate, and triallyl isocyanurate as fi linking agents were immersed in the above solder bath. Even shape 11i-
However, molded products using other crosslinking aids had poor shape retention.

In addition, electron beam irradiated molded products made of fluororesin compositions using trimethyl methacrylic cyanurate, trimethyl methacrylisocyanurate, trimethyl acrylic cyanurate, trimethyl acrylic isocyanurate, triallyl cyanurate, or triallyl isocyanurate as a crosslinking agent. , Is the shape even after solder immersion at 350°C?
was holding it.

Furthermore, when Co was subjected to r-ray irradiation instead of electron beam irradiation, it was found that it did not dissolve even when immersed in a 350'C solder bath for 15 seconds, similar to electron beam irradiation.

[Structure of the invention]

As described above, the cross-linked fluororesin molded product of the present invention has a cross-linked fluororesin with trimethyl methacrylic ciaslate, trimethyl methacrylylisocyanurate, trimethyl acrylic cyanurate, trimethyl acrylic isocyanurate, triallyl cyanurate, or triallyl isocyanurate. ) Since the second cutting is carried out and radiation cross-linking is carried out, the shape does not melt and deform even when heated above the melting point of the fluororesin. It is possible to retain it.

Next, the present invention will be explained in detail using examples.

〔Example〕

Resin composition k, type 1f added with the crosslinking aid shown in Table 1? Using the injection molding geometry of pressure cuff 0, a bobbin for a transformer with the shape shown in Fig. 1 was molded. In Fig. 1, the bottle stand part, (2) is the bobbin body, and (3) is the collar part. .After that, these molded objects were subjected to electron beam application of 2 MeV!!
"Used electron beam t3, 1.0, 25, 35 Mra
d irradiated.

Next, this bobbin was fully wound with enamelled wire, two rows of bottle stands were made, and a power transformer was formed.
The pins and enamel windings were all soldered, and the bobbin shape change noise was investigated, and the results shown in Table 1 were obtained. As a result, all of the molded products irradiated within the dose range of the present invention retained their shape even when immersed in solder.

A bobbin for a transformer that uses the fluororesin composition shown in Table 1 and has the same shape as the actual example? Injection molded. 3. The molded product was subjected to 2 MeV electron beam heating in the same manner as in the example.
The entire sample was irradiated with an electron beam of 1O125.35 Mrad. Next, the enamel electric wire was completely wound around this bobbin, and the wire was completely wound with a pin stand to form a power transformer, and the entire wire was dipped in solder in the same manner as in the example. As a result, it was found that all of the molded products made of the composition of the comparative example, regardless of whether they were unirradiated or fully irradiated, suffered misalignment of the bottle due to immersion in the solder bath, and it was recognized that this would not affect practical use.

Table 1 1) FEP: Tetrafluoroethylene-hexafluoropropylene copolymer (TEFEP: DuPont brand name 2) ETFE
: Ethylene-tetrafluoroethylene copolymer (Tefzel: product name supplied by Du pon') 3) 350
"C-15 seconds immersion ○: No deformation △: Deformation ×: Melting

[Brief explanation of drawings]

FIG. 1 shows the entire molded article (bobbin for a transformer) according to an embodiment of the present invention. (1) is the pin stand part, )2) is the bobbin body, and (3) is the collar part. Figure 1

Claims (1)

[Claims] (1) Tetrafluoroethylene-hexafluoropropylene copolymer or ethylene-tetrafluoroethylene copolymer, triallyl cyanurate, triallyl isocyanurate, trimethyl methacrylic cyanurate, trimethyl methacrylisocyanurate, trimethyl acrylic cyanurate, trimethyl 1. A crosslinked fluororesin molded article, which is a molded article of a fluororesin composition containing a crosslinking aid selected from acrylic isocyanurate, which is crosslinked by irradiation with ionizing radiation.