Teflon dynamic low temperature plasma surface modified long-acting hydrophilic membrane and its preparation method

Abstract

The invention relates to a teflon dynamic low temperature plasma surface modified long-acting hydrophilic membrane and its preparation method. The teflon dynamic low temperature plasma surface modified long-acting hydrophilic membrane is composed of three layered structures: an interface layer is a teflon membrane (1) of 0.025-1mm thickness, and each of the upper and lower surfaces of the teflon membrane is coated with a layer of low temperature plasma hydrophilic membrane (2) (3) of 10-300nm thickness. The hydrophilic membrane provided by the invention has advantages of simple structure, reasonable design, good surface hydrophilic effect, long maintenance time of the hydrophilic effect, high production efficiency and no influence of the preparation process on the environment, and can meet requirements on printing, gluing, bonding and compounding with other materials.

Description

(1) Technical field [0001] The invention relates to a polytetrafluoroethylene dynamic low-temperature plasma surface modified long-acting hydrophilic membrane and a preparation method thereof. (2) Background technology [0002] Polytetrafluoroethylene (PTFE) material has excellent comprehensive properties and has the reputation of "King of Plastics". However, due to its highly symmetrical molecular structure, high crystallinity and no active groups, its surface energy is very low (19dyns / cm), the surface is extremely hydrophobic (the contact angle with water exceeds 100°). This extremely low surface activity and non-stickiness have seriously affected the application of PTFE in bonding, printing and dyeing, biocompatibility, etc., especially limiting the compounding of PTFE films and other materials. [0003] At present, the commonly used method for PTFE surface treatment is wet chemical treatment, that is, naphthalene-sodium and ammonia-sodium solution treatment. The surf...

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Problems solved by technology

[0002] Polytetrafluoroethylene (PTFE) material has excellent comprehensive properties and has the reputation of "King of Plastics". However, due to its highly symmetrical molecular structure, high crystallinity and no active groups, its surface energy is very low (19dyns / cm), the surface is extremely hydrophobic (the contact angle with water exceeds 100°)

This extremely low surface activity and non-stickiness have seriously affected the application of PTFE in bonding, printing and dyeing, biocompatibility, etc., especially limiting the composite of PTFE film and other materials.

[0003] At present, the commonly used method for PTFE surface treatment is wet chemical treatment, that is, naphthalene-sodium and ammonia-sodium solution treatment. The surface resistivity of PTFE decreases at high temperature, and the bonding performance of the material will be seriously reduced when exposed to sunlight for a long time; a large amount of harmful waste liquid will be generated during the treatment process, which not only seriously pollutes the environment, but also increases the treatment cost of the enterprise, which does not comply with environmental protection policies

[0006] However, the existing low-temperature plasma surface treatment is basically a static treatment, which is not suitable for mass production of film products. In addition, the maintenance time of the hydrophilic effect after treatment is relatively short, generally only a few hours to a few weeks

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