The waterproof treatment of filter materials and PTFE immersion treatment have similarities and differences. The two use different chemical treatment agents to achieve different treatment effects through impregnation, rolling, high-temperature drying, and baking. The production processes of the two are basically the same.
- The difference lies in the fact that the effective ingredients of the treatment agent are different
Fluorine based water repellent agents are generally used for waterproofing treatment. The water repellent component is a perfluoroalkyl acrylate copolymer, which can form a thin film with low surface tension on the fiber surface during high-temperature baking, making the surface tension of the fabric less than that of water and oil, thus achieving good water and oil repellent effects.
The PTFE immersion treatment uses a suspension dispersion made of polytetrafluoroethylene powder, which solidifies on the surface of fibers and filter media during high-temperature baking.
The weight change of the product after chemical treatment is different
After waterproof treatment, the chemical active ingredients generally increase the weight of filter media by 0.8% -1.2%, while after PTFE immersion treatment, the chemical active ingredients generally increase the weight of filter media by 5% -10%.
The surface state of filter media after chemical treatment is different
After waterproof treatment, the surface structure of the filter material remained basically unchanged. After PTFE immersion treatment, there was obvious adhesion of the treatment agent on the surface of the filter material, which changed the original surface structure of the filter material, making the surface of the filter material smoother and the pores smaller.
- Differences in usage functions:
The key to waterproofing treatment is to improve the waterproof performance of the filter material, which has an anti condensation effect during use. It can improve the surface cleaning effect to a certain extent. PTFE impregnation treatment has a certain waterproof performance, mainly to improve the corrosion resistance of the filter material. At the same time, due to the smoothness of the filter material surface and the reduction of pores, the filtration and ash cleaning performance of the filter material is improved to a certain extent.
The ideal state of PTFE in filter media: PTFE is coated on the surface of glass fibers to form a complete membrane, but in reality, some PTFE accumulates in the gaps between the glass fibers, and local fibrosis occurs to achieve both good adhesion and good breathability.