Process and application of ptfe color film

PTFE(TEFLON) color film is a new type of c-grade insulation material with excellent comprehensive performance, which is suitable for special requirements, such as electrical instruments marked by color or wire insulation, etc. It is an indispensable and important material in radio industry, aviation industry and cutting-edge electronic science and technology. In the early application of PTFE plastic insulated wire and cable, it was only limited to the internal wiring and lead wiring of electrical and electronic equipment in the high-temperature area of aircraft, ships and other engine rooms in the military field. With the promotion of preparation technology, PTFE has been gradually extended to civil electrical and electronic equipment installation lines in general high-temperature environment. In the past, domestic PTFE films were mostly natural colors of materials (because PTFE films are not easy to be colored). In order to distinguish the incoming and outgoing lines of different transmission signals and make them easy to be distinguished, coating method had to be used for coloring.

With the domestic PTFE color film production reaching a certain scale, through improving the process, the performance indexes of the products are mostly up to the level of similar foreign products. However, at present domestic PTFE color film products have obvious deficiencies in color sense and other aspects of appearance, such as uneven distribution of color spots and other problems. With the development of the new PTFE color film preparation technology and the continuous improvement of users' flame retardant requirements for wires and cables, PTFE color film insulated wires and cables have been applied more and more widely in high-rise buildings, motor vehicles, computer local area network, subway and other non-high-temperature environments.

Production process of ptfe color film:

 (1) pretreatment of PTFE resin raw materials

PTFE suspended fine resin was placed in a constant greenhouse at 20℃ ~ 23℃ for 24 hours for pretreatment.

(2) pretreatment of pigments

Put the inorganic pigment in the drying dish of 2O℃ ~ 23℃ for more than 24 hours to be used.

(3) color

A certain amount of pre-treated PTFE suspended fine resin was added to the rammer, and a certain amount of pre-treated inorganic pigment was added to mix at high speed to disperse the pigment evenly, and the resin was loose to facilitate the molding process.

(4) mold

The dyed colored PTFE fine material was added into the mold by cold pressing process, and the 40 000g PTFE colored fine material resin was pressed into the blank on the 100 ton automatic pressure machine at the 2O MPa molding single pressure. During the pressing, attention was paid to exhaust gas to avoid the crack of the blank material.

(5) sintering

Will suppress good color embryo of high temperature sintering furnace, heating at a rate of about 5 ℃ / h o to 330 ℃, heat preservation, 3 h, then rising at a rate of about 25 ℃ / h to about 380 ℃, insulation 10 ~ 14 h, and then cooling at a rate of about 20 ~ 25 ℃ / h to 320 ℃, the heat preservation 3 ~ 4 h, the final cooling at a rate of about 5 ℃ o/h to 15 ℃, o shut electric natural cooling to room temperature, out of color products.

(6) turning into a film

The sintered preforms of color products are turned into thin film preforms by special lathe. The membrane blank is 0.1 mm×100 mm× greater than 300 m(thickness × width × length).

(7) calendering orientation

The color directional blank after turning is processed by the hot roll directional calender (see FIG. 3) and becomes directional degree of 1.5 ~ 1.8, thickness 0.05 mm semi-directional film, hot roll temperature control in about 100℃.

(8) trimming

Let's make the thickness 0.05 mm semi-directional color film with special cutting machine processing into 0.PTFE color film with 05 mm×90 mm× greater than 10m(thickness × width × length).

(9) inspection of packaging

The processed PTFE colored film will be sampled for internal performance inspection, and the appearance and size inspection of the film will be conducted at the same time. The qualified products will be packaged in PVC film bags with inspection certificate attached.