PTFE Board Manufacturers Analyze PTFE Manufacturing Process: PTFE is what we often call PTFE. Below we have made a summary of its manufacturing process. Interested friends can come and have a look!

Polytetrafluoroethylene (English abbreviation Teflon or [PTFE,F4]), is known as/commonly known as "plastic king", Chinese trade name "Teflon", "Teflon", "Teflon", "Teflon", "Teflon", "Teflon" and so on. It is a polymer compound formed by the polymerization of tetrafluoroethylene. It has excellent chemical stability and corrosion resistance (it is one of the best materials for corrosion resistance in the world today. In addition to molten metal sodium and liquid fluorine, it can withstand other All chemicals can not change when boiled in king water, widely used in all kinds of need to resist acid and alkali and organic solvents), sealing, high lubrication non-stick, electrical insulation and good anti-aging endurance, excellent temperature resistance (can work at a temperature of 250 ℃ to -180 ℃ for a long time). Polytetrafluoroethylene itself is not toxic to humans, but one of the raw materials used in the production process, ammonium perfluorooctanoate (PFOA), is considered to be carcinogenic.

It has solved many problems in China's chemical, petroleum, pharmaceutical and other fields. PTFE seals, gaskets, gaskets. PTFE seals, gaskets, sealing gaskets are made of suspension polymerization PTFE resin molding. Compared with other plastics, PTFE has the characteristics of chemical resistance and corrosion resistance, and it has been widely used as a sealing material and filling material.

Used as engineering plastics, it can be made into PTFE tubes, rods, belts, plates, films, etc. It is generally used in corrosion-resistant pipes, containers, pumps, valves, radar, high-frequency communication equipment, radio equipment and so on. The dispersion liquid can be used as an insulating immersion liquid for various materials and an anti-corrosion layer on the surface of metal, glass and pottery. All kinds of PTFE ring, PTFE gasket, PTFE packing, etc. are widely used in all kinds of anti-corrosion pipeline flange sealing. In addition, it can also be used for drawing silk, polytetrafluoroethylene fiber-fluoron (foreign trade name is Teflon).

At present, all kinds of PTFE products have played a pivotal role in the national economy such as chemical industry, machinery, electronics, electrical appliances, military industry, aerospace, environmental protection and bridges.

Polytetrafluoroethylene (PTFE) molding technology PTFE mainly molding, hydraulic, pushing, extrusion, spraying, bonding, welding and winding, the most common molding technology. The first five are directly processed into products with PTFE resin, and the latter three are processed into various products with PTFE plastic plates or thin strips. In addition to rolling method, thermoforming method and other molding methods. Now briefly introduce a variety of molding methods.

Most of the compression molding method uses suspension resin. When the thickness is less than 1.5mm, the dispersion resin is used. The process is as follows: resin-sieving (suspended resin is mashed, loosened and sieved through a 20-mesh sieve)-press (PTFE powder loaded into the mold is under a pressure of 20-235Mpa, compaction and molding by press)-sintering (sintering in a sintering furnace at a temperature of 370 ℃-380 ℃)-molding finished products (after cooling and setting in the mold or free state, they become the required plates, rods, tubes, gaskets and packing products, etc.).

Hydraulic method Hydraulic method, also known as isobaric method or rubber bag method, is the 1 special method for making PTFE products. Hydraulic pressure is applied to the rubber bag to expand PTFE resin to the mold, so that it is compacted and sintered into products. The basic operation process is: place the rubber bag in the outer mold-connect the water pump, filling tap water to make the rubber bag expand into a cylindrical shape-resin is evenly added between the bag and the outer mold-the mold is closed-water is continuously filled to gradually increase the water pressure, when the pressure reaches 12-13Mpa, the water is kept for 30min, and then the water is discharged-decompression, mold removal, sintering and cooling are the preproducts with smooth appearance.

2.3 pushing method is also called paste extrusion molding. Dispersion resin sieved at 20-30 mesh and organic liquid (toluene, petroleum ether, solvent oil, etc.) are prepared into a 1:5 paste mixture, pre-pressed into a thick-walled cylindrical blank, put into a cylinder of a pushing press, heated, pressed and formed with a plunger, dried and sintered at 360-380 ℃, and cooled to obtain tough pushing tubes, rods and other products.

2.4 extrusion molding can be divided into two types: screw extrusion and plunger extrusion. The pre-sintered resin after crushing and sieving is added to the charging cylinder. Through the rotation of the screw or the reciprocating push of the plunger, the raw materials are compacted and transported to the extruder. At 360-400 ℃, various tube and rod products are formed by continuous extrusion, sintering and cooling.

2.5 spraying method has two processes: PTFE emulsion spraying followed by sintering film formation and PTFE resin powder plasma direct spraying film formation.

2.6 bonding method bonding method is the use of treatment solution to destroy the C- F chain on the surface of PTFE, so that the F atoms are separated, leaving the carbon atoms so that the surface can be bonded with the adhesive and the substrate.

2.7 welding method There are two kinds of welding method, the 1 is to use PFA welding rod for hot air welding; the 1 is to use a certain temperature and pressure to fuse the two PTFE plates together.

2.8 Winding method Winding method is the 1 new type of corrosion protection technology with its own characteristics developed in China for many years. Its characteristic is that it can process various complex components and occupies an important position in the corrosion resistant lining process in China. This method is actually the same as the hot press welding method, which relies on the control of temperature and pressure to weld PTFE together, but the difference is that the welding method is single-layer local melting, and the winding method is multi-layer overall melting. The quality requirements of the latter are better than the former.

2.9 rolling method rolling molding can be divided into one-way rolling and multi-directional rolling two processes, after rolling treatment, PTFE diaphragm from the original opaque white, into translucent crystal color. One-way rolling is to reheat the film to a transparent shape and quickly pass through two identically rotating rolls of the calender. Calendering ratio control in the 1.5-2.5 range, the general roller speed 20 r/min. Multi-directional rolling is a molding processing method in which the diaphragm after sintering and quenching is placed on a calender for multi-directional rolling and gradually reducing the film thickness. Wherein the calendering ratio is in the range of 2-2.5. The temperature of the drum should be controlled at 150-200 ℃, and the steam pressure should be 0.5-0.9MPa when the steam is heated. Calendering ratio is an important parameter, too large and too small are not good for products. Sometimes it is necessary to roll repeatedly to press a piece of product.

2.10 Thermoforming Thermoforming is the 1 method of making plastic articles using sheets of thermoplastics as raw materials. When manufacturing, the sheet cut into a certain size and fixed shape is clamped on the frame and heated to a thermal elastic state, and then the pressure is applied to make it close to the mold surface, thus obtaining a shape similar to the surface. After the formed sheet is cooled, it can be taken out of the mold, and after proper trimming, it becomes a product. The pressure applied is primarily by means of a pressure difference between the two sides of the sheet, but may also be by means of mechanical or hydraulic pressure. The basic methods of thermoforming include differential pressure forming, covering forming, plunger-assisted pressure forming, back suction forming, die forming and double-piece thermoforming.