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Title:
POLYTETRAFLUOROETHYLENE COMPOSITE FILTER MATERIAL, AND PREPARATION METHOD THEREFOR AND APPLICATION THEREOF
Document Type and Number:
WIPO Patent Application WO/2021/189761
Kind Code:
A1
Abstract:
A polytetrafluoroethylene composite filter material, and a preparation method therefor and an application thereof. The polytetrafluoroethylene composite filter material comprises a support layer and a polytetrafluoroethylene microporous membrane layer; the support layer and the polytetrafluoroethylene microporous membrane layer are composited by an adhesive; the adhesive comprises a two-component polyurethane adhesive, a pore-forming agent, and an inorganic filler. During curing, the pore-forming agent forms an irregular pore structure at a bonding interface, and the inorganic filler prevents the adhesive from entering micropores of the polytetrafluoroethylene membrane; after compositing, the breathability and filter efficiency of the polytetrafluoroethylene microporous membrane are not affected.

Inventors:
LI JIA (CN)
XIAO ZHONGLIANG (CN)
XIAO PING (CN)
LI HUI (CN)
YANG FAN (CN)
CAI CHUNYANG (CN)
Application Number:
PCT/CN2020/110704
Publication Date:
September 30, 2021
Filing Date:
August 24, 2020
Export Citation:
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Assignee:
ZHONGHAO CHENGUANG RES INSTITUTE OF CHEMICAL INDUSTRY CO LTD (CN)
International Classes:
B01D39/14; B01D71/36; B32B27/12
Domestic Patent References:
WO2000056162A12000-09-28
Foreign References:
CN105854414A2016-08-17
CN102068924A2011-05-25
CN108472567A2018-08-31
CN104582949A2015-04-29
CN105814711A2016-07-27
CN104998469A2015-10-28
CN108057279A2018-05-22
Other References:
See also references of EP 4129442A4
Attorney, Agent or Firm:
CN-KNOWHOW INTELLECTUAL PROPERTY AGENT LIMITED (CN)
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