PE breathable film with high strength and high barrier filtering performance and composite fabric prepared from PE breathable film

Abstract

The invention discloses a PE breathable film with high strength and high barrier filtering performance and a composite fabric prepared from the PE breathable film. The PE breathable film has the thickness of 7-30 microns, the air permeability of 20-100 s/100 ml, the porosity of 40-70%, the needling strength of 2.0 N or above, the longitudinal breaking strength of 15 N/25 mm or above, the transverse breaking strength of 15 N/25 mm or above, the filtering efficiency of 99.97% or above and the hydrostatic pressure resistance of 450 cm H2O or above. The preparation method of the PE breathable film comprises the following steps of: blending polyethylene and a plasticizer through an extruder to form a homogeneous phase blend, and sequentially carrying out sheet casting, two-way stretching, extraction, heat setting and rolling on the homogeneous phase blend to obtain the PE breathable film. The problem of poor pore diameter consistency of a breathable film can be greatly improved, the transverse mechanical strength of the breathable film is improved, meanwhile, the effective blocking path of the breathable film is prolonged, and therefore the filtering efficiency and reliability are improved. The composite fabric prepared by using the PE breathable film has more excellent bidirectional mechanical strength and more efficient barrier filtering performance compared with a fabric compounded by using an inorganic additive breathable film.

Description

technical field [0001] The invention belongs to the technical field of breathable membranes, and specifically relates to a PE breathable membrane with high strength and high barrier filtration performance and a composite fabric thereof. Background technique [0002] At present, medical protective clothing is a necessary protective clothing to ensure the safety of medical staff, public health workers, patients, and those who enter the infected area due to hospital visits. Its role also includes isolating germs, harmful ultrafine dust, acid-base non-toxic solution, etc., to ensure the safety of the life and work of the relevant personnel, while keeping the environment clean. The performance indicators of medical protective clothing mainly refer to protection, comfort, physical and mechanical properties, etc. Among them, protection is the most important performance requirement for medical protective clothing, mainly including liquid barrier, microbial barrier, and particulate ...

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems caused by inorganic fillers such as poor uniformity of air-permeable membrane pore size, low mechanical strength, especially low transverse strength, short barrier path and limited protective effect, the purpose of the present invention is to provide a PE breathable membrane with high strength and high barrier filtration performance. The preparation process of the PE gas-permeable membrane is similar to that of the wet-process lithium-ion battery separator, both of which adopt the thermally induced phase separation method; based on the wet-process membrane process, the improved formula and optimized production process produce a PE breathable membrane that can be used for protection

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