KR20220096430A - porous fluorine resin composite and filter unit - Google Patents

porous fluorine resin composite and filter unit Download PDF

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Publication number
KR20220096430A
KR20220096430A KR1020200188845A KR20200188845A KR20220096430A KR 20220096430 A KR20220096430 A KR 20220096430A KR 1020200188845 A KR1020200188845 A KR 1020200188845A KR 20200188845 A KR20200188845 A KR 20200188845A KR 20220096430 A KR20220096430 A KR 20220096430A
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South Korea
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porous
ptfe
membrane
electron beam
fluororesin composite
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KR1020200188845A
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Korean (ko)
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김성철
조원준
심용기
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(주)코멤텍
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0081—After-treatment of organic or inorganic membranes
    • B01D67/009—After-treatment of organic or inorganic membranes with wave-energy, particle-radiation or plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/30—Polyalkenyl halides
    • B01D71/32—Polyalkenyl halides containing fluorine atoms
    • B01D71/36—Polytetrafluoroethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/12—Chemical modification
    • C08J7/123—Treatment by wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

Abstract

The present invention relates to a porous fluorine resin composite having a first porous PTFE membrane, a second porous PTFE membrane, and a plurality of air permeable support materials, wherein the first PTFE porous film is positioned upstream in the flow direction of a fluid more than the second PTFE porous film, the first PTFE porous film is physically and chemically modified simultaneously on the surface by irradiation with electron beams, and a porous fluorine resin film subjected to post-heat treatment and surface treatment with electron beams is provided to have high collection efficiency and low pressure loss.

Description

전자빔으로 표면 처리된 불소수지 다공질막을 구비한 다공성 불소수지 복합체 및 이를 구비한 필터 유닛{porous fluorine resin composite and filter unit}A porous fluororesin composite having a fluororesin porous membrane surface-treated with an electron beam and a filter unit having the same

본 발명은 전자빔으로 표면 처리된 불소수지 다공질막을 구비한 다공성 불소수지 복합체 및 이를 구비한 필터 유닛에 관한 것이다.The present invention relates to a porous fluororesin composite having a fluororesin porous membrane surface-treated with an electron beam, and a filter unit having the same.

종래, PTFE 다공질막은, 에어 필터 여과재로서 다양한 분야에서 사용되고 있다. 진애 포집 성능이 우수한 PTFE 다공질막은, 분진이 적은 곳에서의 사용(예를 들어, 클린룸 내에서의 사용)에는 매우 적합하다. 그러나, 외기 처리 공조용 또는 터빈용 흡기 필터와 같은 대기 티끌의 여과에 사용하면, PTFE 다공질막의 표층부에서만 부유 분진을 포집하고, 그 결과 막힘을 일으켜 압력 손실이 상승하는 경우가 있었다. 그래서, 공기의 흐름의 상류측에, 부직포 등의 통기성 부재를 프리필터층으로서 설치함으로써, 미리 큰 분진을 포집하고, PTFE 다공질막의 막힘을 방지하여 에어 필터 여과재의 장수명화를 도모하는 시도가 이루어져 있다(특허문헌 1). 그러나, 특허문헌1에 기재된 에어 필터 여과재에서는, 프리필터층을 두껍게 하지 않으면 PTFE 다공질막의 막힘 방지 효과가 얻어지지 않기 때문에, 제조 비용이 높아진다고 하는 문제가 있었다. 또한, 프리필터층을 두껍게 하면, 에어 필터 여과재의 플리트 가공(연속된 W자 형상의 접힘)이 곤란해진다고 하는 문제도 있었다.Conventionally, a PTFE porous membrane is used in various fields as an air filter filtration material. The PTFE porous membrane excellent in dust collection performance is very suitable for use in a place with little dust (for example, use in a clean room). However, when used for filtration of atmospheric dust, such as for outdoor air treatment air conditioning or turbine intake filters, suspended dust is collected only on the surface layer of the porous PTFE membrane, resulting in clogging and pressure loss in some cases. Therefore, by providing a breathable member such as a nonwoven fabric as a pre-filter layer on the upstream side of the air flow, an attempt has been made to collect large dust in advance, prevent clogging of the PTFE porous membrane, and increase the life of the air filter medium ( Patent Document 1). However, in the air filter medium described in Patent Document 1, since the effect of preventing clogging of the PTFE porous membrane is not obtained unless the pre-filter layer is thickened, there is a problem that the manufacturing cost becomes high. Moreover, when the pre-filter layer was thickened, there also existed a problem that the pleat processing (continuous W-shaped folding|folding) of an air filter medium became difficult.

분진에 의한 PTFE 다공질막의 막힘을 방지하는 방법으로서, 제1 PTFE 다공질막과 제2 PTFE 다공질막을 적층하고, 제2 PTFE 다공질막의 평균 구멍 직경이 제1 PTFE 다공질막의 평균 구멍 직경보다 크고, 제1 PTFE 다공질막보다 공기의 흐름의 상류측에 제2 PTFE 다공질막을 배치한 에어 필터 여과재가 제안되어 있다(특허문헌2). 특허문헌 2에 의하면, 제2 PTFE 다공질막이 분진 중의 직경이 큰 것을 포집하는 프리필터로서 기능하여, 에어 필터 여과재의 압력 손실의 상승이 억제되는 것이 기재되어 있다(단락 [0006]). 특허문헌 2의 에어 필터 여과재는, 입자 직경 0.1 내지 0.2㎛의 다분산 디옥틸프탈레이트(DOP)를 사용하여 포집 효율을 측정하고 있다는 점에서 명백한 바와 같이, 압력 손실의 상승이 억제되도록, PTFE 다공질막의 평균 구멍 직경이 제어되어 있다.A method of preventing clogging of a PTFE porous membrane by dust, wherein a first PTFE porous membrane and a second PTFE porous membrane are laminated, the average pore diameter of the second PTFE porous membrane is larger than the average pore diameter of the first PTFE porous membrane, and the first PTFE An air filter medium in which a second PTFE porous membrane is disposed on the upstream side of the air flow from the porous membrane has been proposed (Patent Document 2). According to Patent Document 2, it is described that the second porous PTFE membrane functions as a pre-filter for collecting particles having a large diameter in the dust, thereby suppressing an increase in the pressure loss of the air filter medium (paragraph [0006]). The air filter medium of Patent Document 2 uses polydisperse dioctylphthalate (DOP) with a particle diameter of 0.1 to 0.2 µm to measure the collection efficiency, so that the increase in pressure loss is suppressed. The average hole diameter is controlled.

<선행문헌><Prior literature>

(특허문헌 1) 일본 특허 공개 제2000-300921호 공보(Patent Document 1) Japanese Patent Laid-Open No. 2000-300921

(특허문헌 2) 일본 특허 공개 제2001-170424호 공보(Patent Document 2) Japanese Patent Laid-Open No. 2001-170424

본 발명은 후열처리하고 전자빔으로 표면 처리된 불소수지 다공질막을 구비하여, 높은 포집 효율과 낮은 압력 손실을 갖는 다공성 불소수지 복합체 및 이를 구비한 필터 유닛을 제공하는 것을 목적으로 한다.An object of the present invention is to provide a porous fluororesin composite having a fluororesin porous membrane subjected to post-heat treatment and surface treatment with an electron beam, the porous fluororesin composite having high collection efficiency and low pressure loss, and a filter unit having the same.

상기의 과제 및 추가적 과제에 대하여 아래에서 자세히 서술한다.The above tasks and additional tasks will be described in detail below.

상기의 과제를 해결하기 위한 수단으로서,As a means for solving the above problems,

본 발명은, 제1 PTFE다공질막, 제2 PTFE다공질막 및 복수의 통기성 지지재를 구비한 다공성 불소수지 복합체이며, 상기 제1PTFE다공질막은 상기 제2PTFE 다공질막보다 유체의 흐름 방향에서 상류에 위치하며, 상기 제1PTFE다공질막은 전자빔을 조사하여 표면을 물리적 개질 및 화학적 개질이 동시에 이루어진, 다공성 불소수지 복합체를 제공한다.The present invention is a porous fluororesin composite having a first porous PTFE membrane, a second porous PTFE membrane, and a plurality of breathable support materials, wherein the first porous PTFE membrane is located upstream in the flow direction of the fluid than the second porous PTFE membrane, , The first PTFE porous membrane provides a porous fluororesin composite in which physical and chemical modification of the surface of the first PTFE porous membrane is simultaneously made by irradiating electron beams.

또한, 상기 제1PTFE다공질막은 PTFE 미분말에 액상 윤활제를 가한 혼합물을 소정 방향으로 연장되는 시트상으로 성형하고, 상기 시트상 성형체를 폭 방향으로 3 내지 40배로 연신하고, 상기 연신된 시트상 성형체로부터 액상 윤활제를 제거한 후에, PTFE의 융점 이상의 온도에서 상기 길이 방향으로 5 내지 20배, 100-200℃에서 폭방향으로 5-20배로 연신한 후에 PTFE의 융점 이상의 온도로 후열처리하고, 전자빔을 조사하여 제조된, 다공성 불소수지 복합체를 제공한다.In addition, the first PTFE porous membrane is formed by molding a mixture obtained by adding a liquid lubricant to a fine PTFE powder into a sheet extending in a predetermined direction, and stretching the sheet-like molded body 3 to 40 times in the width direction, and liquid phase from the stretched sheet-like molded body After removing the lubricant, after stretching 5 to 20 times in the longitudinal direction at a temperature above the melting point of PTFE and 5 to 20 times in the width direction at 100-200° C., post heat treatment at a temperature above the melting point of PTFE, and irradiating electron beam to provide a porous fluororesin composite.

또한, 상기 제1PTFE다공질막에 조사된 전자빔은, 전자빔 에너지 10~500 keV 및 전자빔의 조사량 1×1016　내지1×1019　electrons/cm2 인, 다공성 불소수지 복합체를 제공한다.In addition, the electron beam irradiated to the first PTFE porous membrane is an electron beam energy of 10 to 500 keV and an irradiation amount of the electron beam of 1×10 16 to 1×10 19 electrons/cm 2 , providing a porous fluororesin composite.

또한, 상기 다공성 불소수지 복합체를 포함하는 필터 유닛을 제공한다.In addition, it provides a filter unit comprising the porous fluororesin composite.

본 발명의 일실시예에 따른 다공성 불소수지 복합체 및 이를 구비한 필터 유닛은 후열처리하고 전자빔으로 표면 처리된 불소수지 다공질막을 구비하여, 높은 포집 효율과 낮은 압력 손실을 갖는다.The porous fluororesin composite and the filter unit having the same according to an embodiment of the present invention include a fluororesin porous membrane surface-treated with an electron beam after post-heat treatment, so that it has high collection efficiency and low pressure loss.

상기의 효과 및 추가적 효과에 대하여 아래에서 자세히 서술한다.The above effects and additional effects will be described in detail below.

이하, 본 발명의 일부 실시예들을 예시적인 도면을 통해 상세하게 설명한다. 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 대해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 또한, 본 발명의 실시예를 설명함에 있어, 관련된 공지 구성 또는 기능에 대한 구체적인 설명이 본 발명의 실시예에 대한 이해를 방해한다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function interferes with the understanding of the embodiment of the present invention, the detailed description thereof will be omitted.

본 발명의 실시예의 구성요소를 설명하는 데 있어서, 제1, 제2, A, B, (a), (b) 등의 용어를 사용할 수 있다. 이러한 용어는 그 구성요소를 다른 구성요소와 구별하기 위한 것일 뿐, 그 용어에 의해 해당 구성 요소의 본질이나 차례 또는 순서 등이 한정되지 않는다. 또한, 다르게 정의되지 않는 한, 기술적이거나 과학적인 용어를 포함해서 여기서 사용되는 모든 용어들은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의해 일반적으로 이해되는 것과 동일한 의미를 가진다. 일반적으로 사용되는 사전에 정의되어 있는 것과 같은 용어들은 관련 기술의 문맥상 가지는 의미와 일치하는 의미를 가진 것으로 해석되어야 하며, 본 출원에서 명백하게 정의하지 않는 한, 이상적이거나 과도하게 형식적인 의미로 해석되지 않는다. In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the nature, order, or order of the elements are not limited by the terms. In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

본 발명의 일실시예에 따른 다공성 불소수지 복합체는, 제1 PTFE다공질막, 제2 PTFE다공질막 및 복수의 통기성 지지재를 구비한 다공성 불소수지 복합체이며, 상기 제1PTFE다공질막은 상기 제2PTFE 다공질막보다 유체의 흐름 방향에서 상류에 위치하며, 상기 제1PTFE다공질막은 전자빔을 조사하여 표면을 물리적 개질 및 화학적 개질이 동시에 이루어져 높은 포집 효율과 낮은 압력 손실을 갖는다.The porous fluororesin composite according to an embodiment of the present invention is a porous fluororesin composite having a first porous PTFE membrane, a second porous PTFE membrane, and a plurality of breathable support materials, wherein the first porous PTFE membrane is the second porous PTFE membrane It is located upstream in the flow direction of the fluid, and the first PTFE porous membrane has high collection efficiency and low pressure loss because the surface is physically and chemically modified by irradiating an electron beam.

상기 제1PTFE다공질막은 PTFE 미분말에 액상 윤활제를 가한 혼합물을 소정 방향으로 연장되는 시트상으로 성형하고, 상기 시트상 성형체를 폭 방향으로 3 내지 40배로 연신하고, 상기 연신된 시트상 성형체로부터 액상 윤활제를 제거한 후에, PTFE의 융점 이상의 온도에서 상기 길이 방향으로 5 내지 20배, 100-200℃에서 폭방향으로 5-20배로 연신한 후에 PTFE의 융점 이상의 온도로 후열처리하고, 전자빔을 조사하여 제조될 수 있다. 후열처리하고 전자빔을 조사하는 것에 의해 평균 구멍 직경을 크게, 막 두께를 두껍게 하면서도 높은 포집 효율과 낮은 압력 손실을 양립 가능하게 한다.The first PTFE porous membrane is formed by molding a mixture obtained by adding a liquid lubricant to a fine PTFE powder into a sheet extending in a predetermined direction, stretching the sheet-like molded body 3 to 40 times in the width direction, and extracting a liquid lubricant from the stretched sheet-like molded body. After removal, after stretching 5 to 20 times in the longitudinal direction at a temperature above the melting point of PTFE and 5 to 20 times in the width direction at 100-200 ° C. have. By post-heating and irradiating with an electron beam, the average pore diameter is increased and the film thickness is increased, while achieving both high collection efficiency and low pressure loss.

특히, 상기 제1PTFE다공질막에 조사된 전자빔은, 전자빔 에너지 10~500 keV 및 전자빔의 조사량 1×1016　내지1×1019　electrons/cm2 범위 내인 것이 좋다.In particular, the electron beam irradiated to the first PTFE porous film may have an electron beam energy of 10 to 500 keV and an irradiation amount of the electron beam of 1×10 16 to 1×10 19 electrons/cm 2 within the range.

한편, 본 발명은 상기 다공성 불소수지 복합체를 포함하는 필터 유닛을 포함한다. 필터 유닛의 구조는 제한되지 않으며, 다양할 수 있다. 상기 다공성 불소수지 복합체는 절곡되는 절곡부가 존재할 수 있다.On the other hand, the present invention includes a filter unit including the porous fluororesin composite. The structure of the filter unit is not limited and may vary. The porous fluororesin composite may have a bent portion to be bent.

이상, 본 발명에 따른 실시예들을 첨부된 도면을 참조하여 상세하게 설명하였다. 그러나, 본 발명의 실시예가 반드시 상술한 실시예에 의하여 한정되는 것은 아니고, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에 의한 다양한 변형 및 균등한 범위에서의 실시가 가능함은 당연하다고 할 것이다. 그러므로, 본 발명의 진정한 권리범위는 후술하는 청구범위에 의하여 정해진다고 할 것이다.Above, embodiments according to the present invention have been described in detail with reference to the accompanying drawings. However, the embodiments of the present invention are not necessarily limited by the above-described embodiments, and it will be natural that various modifications and implementations in equivalent ranges are possible by those of ordinary skill in the art to which the present invention pertains. . Therefore, the true scope of the present invention will be determined by the claims to be described later.

Claims (4)

제1 PTFE다공질막, 제2 PTFE다공질막 및 복수의 통기성 지지재를 구비한 다공성 불소수지 복합체이며,
상기 제1PTFE다공질막은 상기 제2PTFE 다공질막보다 유체의 흐름 방향에서 상류에 위치하며,
상기 제1PTFE다공질막은 전자빔을 조사하여 표면을 물리적 개질 및 화학적 개질이 동시에 이루어진, 다공성 불소수지 복합체.
It is a porous fluororesin composite having a first porous PTFE membrane, a second porous PTFE membrane, and a plurality of breathable support materials,
The first porous PTFE membrane is located upstream in the flow direction of the fluid than the second porous PTFE membrane,
The first PTFE porous membrane is a porous fluororesin composite in which the surface is physically and chemically modified by irradiating an electron beam.
 제1항에 있어서,
상기 제1PTFE다공질막은 PTFE 미분말에 액상 윤활제를 가한 혼합물을 소정 방향으로 연장되는 시트상으로 성형하고, 상기 시트상 성형체를 폭 방향으로 3 내지 40배로 연신하고, 상기 연신된 시트상 성형체로부터 액상 윤활제를 제거한 후에, PTFE의 융점 이상의 온도에서 상기 길이 방향으로 5 내지 20배, 100-200℃에서 폭방향으로 5-20배로 연신한 후에 PTFE의 융점 이상의 온도로 후열처리하고, 전자빔을 조사하여 제조된, 다공성 불소수지 복합체.
The method of claim 1,
The first PTFE porous membrane is formed by molding a mixture obtained by adding a liquid lubricant to a fine PTFE powder into a sheet extending in a predetermined direction, stretching the sheet-like molded body 3 to 40 times in the width direction, and extracting a liquid lubricant from the stretched sheet-like molded body. After removal, after stretching 5 to 20 times in the longitudinal direction at a temperature above the melting point of PTFE and 5 to 20 times in the width direction at 100-200° C., post-heat treatment at a temperature above the melting point of PTFE, Porous fluororesin composite.
 제1항에 있어서,
상기 제1PTFE다공질막에 조사된 전자빔은, 전자빔 에너지 10~500 keV 및 전자빔의 조사량 1×1016　내지1×1019　electrons/cm2 인, 다공성 불소수지 복합체.
The method of claim 1,
The electron beam irradiated to the first PTFE porous membrane is an electron beam energy of 10 to 500 keV and an irradiation amount of the electron beam of 1×10 16 to 1×10 19 electrons/cm 2 , a porous fluororesin composite.
 제1항 내지 제3항 중 어느 한 항의 다공성 불소수지 복합체를 포함하는 필터 유닛.A filter unit comprising the porous fluororesin composite of any one of claims 1 to 3.
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