Bonding and curing process of expanded polytetrafluoroethylene membrane

Abstract

The invention discloses a bonding and curing process of an expanded polytetrafluoroethylene membrane, comprising: using FEP (fluorinated ethylene propylene) emulsion as a binder, brushing the FEP emulsion among a plurality of stacked e-PTFE (expanded polytetrafluoroethylene) porous membrane, and bonding the plurality of porous membranes into a sheet of certain thickness to obtain a membrane composite; fixing the membrane composite between two plate-frame fixing clamps; placing the membrane composite along with the clamps in an oven, and heating at 65-250 DEG C in a segmental gradient manner; curing at high temperature and then cooling.By using the FEP emulsion as the binder, the problem of bonding difficulty is solved; by using segmental gradient heating, the problem of removing an emulsifier in the binder is effectively solved; by designing the plate-frame fixing clamps, fixing the membrane composite between the two plate-frame fixing clamps and carrying out segmental gradient heating and high-temperature curing, the problem that the e-PTFE porous membranes experience micropore loss after being heated is solved effectively.

Description

technical field [0001] The invention belongs to the technical field of medical beauty products manufacturing, and relates to a bonding and aging process of expanded polytetrafluoroethylene diaphragms. Background technique [0002] Expanded polytetrafluoroethylene (e-PTFE) is a new type of medical polymer material. Due to its unique microporous structure, general plastic molding processing methods are not suitable for processing this product. In the industry, high-temperature stretching and shaping methods are generally used to produce microporous structures, but the products obtained by such processing methods are generally membrane materials below 1mm, and the thickness requirements of the plastic implant products required are generally around 4-12mm. Based on the above characteristics, it is necessary to use a special process to laminate and bond several diaphragms into a sheet with a certain thickness. [0003] The following difficulties exist in the bonding technology o...

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Problems solved by technology

[0004] 1. The bonding between e-PTFE is extremely difficult, and the binder with complex chemical composition may affect the product quality

[0005] 2. Since the membrane is stretched under heating conditions to produce a microporous structure, it will shrink back under heating conditions and the micropores will disappear

[0007] There is also a lack of a bonding method for expanded polytetrafluoroethylene diaphragms that can effectively solve the above-mentioned difficult problems in the prior art.

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