The invention provides a preparation method of a high-precision
coating filter material. According to the preparation method, the
filter material can be well combined with PTFE (
Polytetrafluoroethylene), and the performances of the
filter material can be improved. The method comprises the following steps: (1) carrying out heat cleaning treatment, namely, performing the heat cleaning treatment on the filter material and removing various assistants on the surface of the filter material at high temperature; (2) performing immersion treatment, that is, performing PTFE immersion treatment on the filter material after heat cleaning treatment; (3) baking,
drying, and carrying out
heat setting on the filter material after immersion treatment sequentially; (4)
coating the filter material after
heat setting; and (5) performing volatilization,
drying,
sintering and
heat setting on the filter material after
coating treatment sequentially. According to the preparation method of the high-precision coating filter material, the filter material is subjected to heat cleaning treatment before immersion treatment, thus, wiredrawing impregnating compound remained on the surface of the
fiber can be effectively removed, and the fabric strength can be ensured not to be lost; the acidic and alkali resistances, the
water resistance, the
oxidation resistance and the abrasion and folding resistances of the filter material can be effectively improved, and the service life of the filter material can be prolonged.