CN105879698A

CN105879698A - Mildew-resistant membrane

Info

Publication number: CN105879698A
Application number: CN201410603034.XA
Authority: CN
Inventors: 郭江明
Original assignee: Hangzhou An Pulu Film Science And Technology Ltd
Current assignee: Hangzhou An Pulu Film Science And Technology Ltd
Priority date: 2014-10-30
Filing date: 2014-10-30
Publication date: 2016-08-24

Abstract

The invention discloses a mildew-resistant membrane, which comprises a membrane body, a support material and a base material. The membrane body is made of ePTFE membrane, whose surface has been subjected to a super hydrophobic treatment so as to form embossments (micrometer level), the roughness of mildew-resistant membrane surface is increased, the contact angle between the mildew-resistant membrane surface and water is larger than 150 degrees, the roll angle is less than 10 degrees; after the super hydrophobic treatment, the oleophobic grade of the mildew-resistant membrane can reach 7 to 8 grade; the mildew-resistant grade can reach 1 or 0 grade, spores cannot grow on the surface; the support material can be PET, PP, PE, a composite material of PP and PE, a composite material of PP and PET, or a composite material of PET and PE; and the base material can be non-woven cloth, gridding cloth, or woven fabric. The filtration accuracy range of the mildew-resistant membrane is 0.02 to 5 [mu]m; the thickness is in a range of 0.5 to 15 [mu]m, and the ventilation amount is 80 to 100 L/m2.s.

Description

A kind of mildew-resistant film

Technical field

The present invention relates to a kind of mildew-resistant film, particularly a kind of ePTFE mildew-resistant film.

Background technology

Mildew-resistant ePTFE membrane is mainly used on the electronic unit of outdoor communication base station, mainly RRU, wave filter, and tower is put, combiner, power amplifier, duplexer, antenna, sensor etc..

Owing to being chronically at open air, so each electronic unit must fully seal to stop rainwater, dust etc..Life-time service silica gel or sealing ring; there will be and seal tired problem; the sealing cavity of these electronic units is often in a unbalanced state of inside and outside differential pressure, it is contemplated that the service life of base station, balance inside and outside differential pressure was the most critically important substantially more than 5 years.It addition, a lot of radio-frequency (RF) component optimum working temperatures are a narrow scope, therefore, in the case of using ePTFE ventilated membrane to be prevented from longtime running, inside cavity temperature is too high.

For being in the communication base station in the case of high humility, easy mould growth, mycete is attached to suitable surface and quickly breeds.No matter the parts of the most almost all of outdoor communication base station, be passive or active to be desirable that mildew-resistant.For ePTFE ventilated membrane, the mycete on surface is likely to result in seal failure.Because mycete can block fenestra, also can block air duct, cause Air permenbility to decline, and then cause inside and outside differential pressure to rise.

The mildew-resistant of diaphragm processes, and having a variety of selection, super-hydrophobic process is one of them.Super-hydrophobic i.e. water droplet is spherical on surface, and contact angle is more than 150 degree.Owing to need to ensure the Air permenbility of film, so super-hydrophobic process can be done on the surface of ePTFE membrane, i.e. the roughness by increasing film surface increases the contact angle of liquid and film surface.

At present, the ePTFE membrane that communication base station is used mostly does not does mildew-resistant and processes, or after mildew-resistant process, grade is not up to the standard of communication electronic unit, therefore, ensureing Air permenbility, while degree of protection and film-strength, the mildew-resistant grade reaching higher becomes those skilled in the art's problem demanding prompt solution.

Summary of the invention

The invention provides a kind of mildew-resistant film, including film main body, backing material.Wherein film main body is ePTFE membrane, its surface is through super-hydrophobic process, form micron-sized projection, adding the roughness on described mildew-resistant film surface, make the mildew-resistant film surface contact angle with water more than 150 °, roll angle is less than 10 °, diaphragm degree of protection after super-hydrophobic process reaches IP67 or IP68, oleophobic grade reaches 7～8 grades, and mildew-resistant grade reaches 1 or 0 grade, makes the spore cannot be in superficial growth；Backing material can be PET, PP, PE, PP and PE composite, PP and PET composite material, PET Yu PE composite；The filtering accuracy scope of this mildew-resistant film is in 0.02 μm～5 μm, and thickness is in 0.2～0.25 μm, and Air permenbility is in the range of 1200～2600ml@70mbar.

Accompanying drawing explanation

Fig. 1 is the present invention super-hydrophobic process rear film surface and Liquid contact angle schematic diagram.

Fig. 2 is the membrane surface contact angle schematic diagram not doing super-hydrophobic process.

Detailed description of the invention

Fig. 1 is the present invention super-hydrophobic process rear film 3 surface and Liquid contact angle schematic diagram, and mildew-resistant film 3 surface is after super-hydrophobic process, and diaphragm 3 surface roughness increases, and forms micron-sized projection 2, and therefore liquid is bigger with the contact angle γ 1 on mildew-resistant diaphragm 3 surface；Fig. 2 is the diaphragm 6 surface contact angle schematic diagram not doing super-hydrophobic process, and owing to roughness is relatively low, liquid is less with the contact angle θ 4 on diaphragm 6 surface.

As shown in Figure 1 and Figure 2, when contact angle 1,4 is less, liquid can enter along the hole on diaphragm 3,6 surface, thus combines together with surface, makes diaphragm 3,6 surface can be wetted；And when contact angle 1,4 is bigger, inserted by gas in the projection 2,5 of diaphragm 3,6 surface micrometre-grade, thus liquid is not easily accessible in hole.

It addition, the present invention is separately added into PET, PP, PE, PP and PE composite, backing materials different with PET composite material, PET Yu PE composite etc. for PP, the mildew-resistant film of varying strength requirement is made all to be met.

Embodiment described above is only to be described the preferred embodiment of the present invention, is not defined the scope of the present invention, and on the premise of without departing from inventive concept of the present invention, any obvious replacement all should fall within the scope of protection of the present invention.

Claims

1. a mildew-resistant film, it is characterised in that include film main body, backing material and base material；

Described film main body is ePTFE membrane, it is characterised in that surface, through super-hydrophobic process, is formed micro-on the surface of described mildew-resistant film The projection of meter level, adds the roughness on described mildew-resistant film surface, makes described mildew-resistant film surface be more than 150 ° with the contact angle of water, Roll angle is less than 10 °；

Described backing material is combined with each other with described film main body, it is characterised in that material can be PET, PP, PE, PP With PE composite, PP and PET composite material, PET Yu PE composite；

Described base material can be non-woven fabrics, grid, woven fabric.

Mildew-resistant film the most according to claim 1, its feature reaches IP67 or IP68 at its degree of protection, and oleophobic grade reaches 7～8 Level, mildew-resistant grade is 1 or 0 grade.

Mildew-resistant film the most according to claim 1, it is characterised in that filtering accuracy is in 0.02 μm～5 μ m, and thickness exists In 0.05～0.40mm, Air permenbility is 200～6000ml/min/cm²In the range of@70mbar.