2 Methods of Producing PTFE: Suspension Polymerization VS Dispersion Polymerization

Suspension Polymerization Method Applications

Suspension Polymerization is mainly used to manufacture seals, gaskets, etc. used in the machinery industry, as well as pumps, valves, pipe fittings, and equipment linings used in chemical equipment, as well as electrical insulation parts and films.

Suspension Polymerization raw materials are generally divided into the following three categories:

  1. Fine powder: The average particle diameter is 20~35μm, which can be used for compression molding.
  2. Granulating material: Has good powder flowability and large apparent density. Coarse particles (about 300μm in diameter) are used for automatic compression molding, hydroforming, and can also be used for general compression molding.
  3. Pre-sintered material: It can be processed into thinner and thinner products by the plunger method. Such as rods with a diameter of 5-50mm, pipes with a wall thickness of 3-25mm, etc.

In addition, Suspension Polymerization can also be processed into ultra-fine powder with a fineness of less than 10μm. Mitsui DuPont Fluorochemicals’ DLX-6000 and Asahi Glass’s L-168, L-169, L-170, and L-171 are such products. Their main purpose is as a dry powder lubricant. At present, with the continuous improvement and improvement of performance, this type of resin is gradually expanding its application range.

Dispersion Polymerization Method Applications

Dispersion Polymerization is mainly used to manufacture corrosion-resistant, high-temperature, high-dielectric wires, and wire. In the chemical industry, it is mainly used to manufacture thread-sealed raw material tape, pipeline lining, etc.

  1. High compression ratio powder: Extrusion molding under the condition of compression ratio greater than 2500:1, suitable for processing into thin-walled thin tubes and wire insulation sheaths with a diameter below 2mm and a wall thickness of 0.2-0.5mm.
  2. Medium compression ratio powder: Extrude under the condition of a compression ratio greater than 400:1, suitable for processing into medium-sized thin-walled tubes with a diameter of 2-15mm and a wall thickness of 0.5mm or more.
  3. Low compression ratio powder: Extrusion under the condition of a compression ratio of less than 300:1, suitable for processing into thicker tubes and thick rods with a diameter of 5mm or more for making sealed raw material belts.

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