Molding shrinkage rate: 3.1-5.0% Molding temperature: 330-380°C Sintering conditions: The best temperature should not exceed 385°C, otherwise the molecules will be necrotic and affect the quality.
Material properties
Long-term use temperature of -200--260 degrees, excellent chemical corrosion resistance, corrosion resistance to all chemicals, the lowest friction coefficient among plastics, and good electrical properties, its electrical insulation is not affected by temperature, It is known as the "Plastic King". 2. In a transparent or translucent state, the higher the crystallinity, the worse the transparency. The raw materials are mostly powdery resins or concentrated dispersions, which have extremely high molecular weight and are thermoplastic polymers with high crystallinity. 3. Suitable for making corrosion-resistant parts, anti-friction wear parts, seals, insulating parts and medical equipment parts 1 K)
Formability
1. Crystalline material, low moisture absorption.
2. Poor fluidity, easy to decompose, and produces corrosive gas during decomposition. The molding temperature should be strictly controlled, the mold should be heated, and the gating system should have resistance to material flow.
should be small.
3. Powder resin is often formed by powder powder metallurgy and sintering method. The sintering temperature is 360-375 degrees, and can not exceed 410 degrees. Emulsion resins are usually processed by cold extrusion and sintering, which can form an anti-corrosion layer on the surface of the article. If the transparency and toughness of the product are required, rapid cooling should be adopted. Extrusion molding can also be adopted, and pipes, rods and profiles can be extruded.
4. The melt viscosity of PTFE is very high, and the melt viscosity decreases with the increase of shear stress, showing the characteristics of its non-Newtonian fluid.
5. Secondary processing can be hot-pressed composite, welded, bonded, strengthened, mechanically processed, etc. to obtain the final product.
6. It is best to use curve sintering in the first step for drying at 120 degrees, and the second step such as filling graphite or two-fluid ink for temperature treatment at 250 degrees. The third step is to process it once at 345 degrees, the fourth step is to process it at 375 degrees, and the fifth step is not to cool down too fast
