TW297062B - Nonwoven fabrics used as filter with polarization - Google Patents

Abstract

Nonwoven fabrics with polarization is used as filterable materials, mainly including: Unsaturated acid and derivatives, unsaturated cyclic monomer and unsaturatedsilane monomer, At least one of them is modified agent, which comprises 0.005~5 wt% of thermoplastics by polarization films to form opening fibers and plating10~150 g/M2, fibers diameter<80 (muon)m.

Description

^ 07062 A7 B7 V. Description of the invention (1) [Background of the invention] The present invention relates to an electret non-woven filter and its manufacturing method, in particular, an electret and woven filter suitable as an air filter and its manufacturing method . [Explanation of related technologies] Conventional air filters for air conditioners, air cleaners, sweepers, fan heaters, 0A machines, air cleaners for car compartments, etc. are used to remove the ambient atmosphere or introduce them into the machine. Dust, medium smoke, odorous substances, pollen, etc. that are inhaled or discharged into the exhaust outside the machine can clean the environment, or to adjust the operating environment of the machine, various reducers can be used. In terms of filters, it is known that various filters using electret polarized polymer films or thin plates (Japanese Patent Laid-Open No. 5 9-2 5 6 12 2, same as 59-25613, same as 59-25614, same 59-51323, same as 60-17-17). Printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling in this page). Also, if the electret resin film is opened to form a nonwoven fabric, it can be used alone or combined with other components The technology used as a filter has been disclosed (Japanese Patent Laid-Open No. 55-1 3 2 6 15, Japanese Patent Laid-Open No. 55-134621, Japanese Patent No. 56-47299). However, the general tendency of filters made of electret non-woven fabrics is that the initial removal efficiency (scavenger) decreases with time. In accordance with this paper standard, the Chinese National Standard (CNS) A4 specification (210X297 mm) is applied. The A7 B7 is printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. 5. Description of the invention (2) After the manufacture of the non-woven polarized fabric, When measuring the removal efficiency of dust, it can show a very high efficiency. When the removal efficiency is measured again after being temporarily placed, it is often seen that the removal efficiency decreases compared with after the manufacturing. Moreover, the conventionally-known electret non-woven fabric * is required to use a filter with a low pressure loss when used as a filter, and a thinner or lower density is used. Therefore, the mechanical strength becomes insufficient, and there is a problem of cracking and elongation during the secondary processing. [Summary of the Invention] Therefore, the first object of the present invention is to provide an electret non-woven filter which is very suitable as an air filter material, which exhibits high removal efficiency, and since the removal efficiency changes little over a long time, it can be used for a long period of time. Exert excellent removal performance. In addition, the second object of the present invention is to provide a method of processing the aforementioned electret non-woven filter material to obtain an excellent mechanical strength and a high-performance suspect. To achieve the aforementioned first object, the present invention provides an electret Nonwoven filter material, which is at least selected from the group consisting of (a) unsaturated carboxylic acid and its derivatives, (b) unsaturated epoxy monomer, and (c) silicon monomer with olefinic unsaturated bond A denaturant is partially or fully denatured, and an electret film composed of a thermoplastic resin containing a structural unit of 0.005 to 5 wt% of a non-polar polymer as a main component is opened An electret non-woven filter material made from the resulting open fibers. The size of this paper is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) -----..----- ^ Packing ------ order ------ ^ sister (please read first (Notes on the back and then fill out this page) -5-A7 ___B7 printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of the invention (3) In addition, in order to achieve the aforementioned second object, the present invention provides an electrified non-woven fabric. The manufacturing method of the material is at least one selected from the group consisting of (a) unsaturated carboxylic acid and its derivatives, (b) unsaturated epoxy monomer, and (c) silane monomer having an olefinic unsaturated bond A denaturant is partially or fully denatured, and an electret film composed of a thermoplastic resin containing a structural unit of 0.005 to 5 wt% of a non-polar polymer as a main component is given The perforated nonwoven fabric formed by opening the fiber web (web) obtained by fiber opening is supplied to the embossing unit with a unit surface grain of 0.05 to 5 mrrf, and an embossing roller with an embossing area ratio of 2 to 30%. Heating at a temperature dissatisfied with the softening point of the thermoplastic resin and pressing, the partially polarized nonwoven fabric is thermally fused and integrated Cheng. [Brief description of the figure] Circle 1 is a graph illustrating the device used in the removal efficiency measurement in Examples and Comparative Examples. [Detailed Description of the Invention] Hereinafter, the electret non-woven fabric filter of the present invention (hereinafter, referred to as the filter of the present invention) and its manufacturing method will be described in detail. In the filter of the present invention, the electret non-woven fabric is an open fiber obtained by opening an electret film made of thermoplastic resin with an average fiber diameter or average fiber dimension of less than 80, preferably 10 to 7 0 4m open fiber The person who made it. In the present invention, the average fiber diameter or the average fiber width is an appropriate amount (100 or more) of fibers, and a photo of the 30 letter of the microscope is taken. The Chinese national standard (CNS) A4 specification is applied to the ruler paper size (2 丨0〆297mm) (Please read the precautions on the back before filling in this page) Binding · Order 2 妁 062 A7 _B7 _ V. Description of the invention (4) Determine each texture in the photo and calculate according to the following formula : Η Σ d ± i = 1 Average fiber diameter (width) =-η di: dimensional diameter (width), η: total number of fibers, the electret non-woven fabric, the amount of embossing (plating) is 10 ~ 15〇g / m ·, preferably 10 to 50 g / ma, can exhibit high removal efficiency and is extremely effective. The thermoplastic resin that constitutes the open-reel raw material of the electret non-woven fabric is thermoplastic, and is electretized by electret treatment formed into a thin film. If the open fiber is feasible, there is no particular limitation, and it can be a single type. Or a mixture of two or more. In the present invention, the thermoplastic resin is preferably a denatured non-polar polymer as the main component, for example, it may be a non-polar polymer that is partially or completely denatured, or may contain a polar polymer. Printed by the Consumer Cooperative of the Central Bureau of Standards (please read the precautions on the back before filling out this page) The non-polar polymer used in the present invention is usually not particularly limited if it is a non-polar polymer, and it is mostly dielectric loss Dielectric loss tangent; tan5) is below 0.0005 (ASTM D150, 6 0 Η z), the volume inherent resistance (ASTM D 2 5 7 * 2 3 ° C, relative humidity 50%) is 101β ~ 10〇2〇 Qcm range. Specific examples of the non-polar polymer include polyhydrocarbons such as polyethylene and polypropylene, polystyrene, polytetrafluoroethylene, tetrafluoroethylene • hexafluoropropylene copolymer, and the like. Polar polymers are generally not limited if they are polar polymers. The paper size is applicable to the Chinese National Standard (CNS) A4 (210X297 mm) _ 7 A7 B7 printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Inventions Explanation (5) Most of them are dielectric loss exceeding 0.005, and the volume inherent resistance is also in the range of 1012 ~ 10le Ocm. The specific example of the polar polymer is melt-formable, and may contain at least one carboxylic acid group , Ester groups, amino groups, hydroxyl groups, ether groups, eye groups, carbonyl groups or chlorine atoms and other polar thermoplastic resins, especially polyethylene terephthalate, polybutylene terephthalate and other polyesters , Nylon 6, Nylon 66, Nylon 12, etc. Polypropylene, polycarbonate, polymethyl methacrylate, polyethyl acrylate and other propyne-based resins, propylene-styrene-based resin (AS) resins , Propylene-butadiene-styrene resin (ABS resin), polyvinyl chloride, polyvinylidene chloride, polychlorotrifluoroethylene, polyacetal, polypropylene eye, etc., these can be used alone or in two or more . In addition, the denatured non-polar polymer is selected from (a) unsaturated acid and its derivatives, (b) unsaturated epoxy monomers, and (c) silane monomers with a combination of hydrocarbon-like unsaturated bonds A non-polar polymer transformed by groups of at least one denaturant. Furthermore, in the present invention, the meaning of "denaturation" is to introduce the denaturant into the main chain or side chain of the molecule of the non-polar polymer, for example, to make the denaturant random relative to the monomer constituting the non-polar polymer The copolymer is either a block copolymerization, or a denaturant is graft copolymerized to a non-polar polymer. (a) Unsaturated carboxylic acid or its derivatives, such as acrylic acid, methacrylic acid, α-ethyl acrylic acid, maleic acid, trans-butenedioic acid, itaconic acid, citraconic acid, tetrahydrophthalide Acid, methyltetrahydrophthalic acid, inward cis-bicyclo [2.1.1] heptyl_5_ene-2,3-dicarboxylic acid (nazic acid ®), methyl- Inward-looking cis-two-ring [2 paper standard suitable for financial security standards (CNS) A4 ^ fe · (21GX297 read) _ s _ (please read the precautions on the back before filling out this page). Binding. A7 A7 ( 1) B7 V. Description of the invention (6) 2.1) Unsaturated dicarboxylic acids such as heptyl-5-en-2,3-dicarboxylic acid (methyl nicotinate®). Unsaturated dicarboxylic acid derivatives such as acid halides, amides, imines, and anhydride esters of the unsaturated dicarboxylic acids. Specific examples of the unsaturated dicarboxylic acid derivatives include maleic chloride, maleic amine, anhydrous maleic acid, anhydrous citraconic anhydride, monomethyl maleate, and dimethyl maleate. Among them, unsaturated dicarboxylic acids or anhydrides thereof are preferred, and maleic acid, nagic acid, or anhydrides thereof are particularly preferred. (b) There is more than one polymerizable unsaturated bond and epoxy monomer in one molecule of unsaturated epoxy single system. The (b) unsaturated epoxy monomer has, for example, the following formula (1): 〇〇II / \ RC—0—CH? —CH—CH; (Here, R is a polymerizable ethylenically unsaturated bond Hydrocarbon group) Unsaturated glycidyl esters shown, formula (2): 1, — ^ ----- ^ installed ------ ordered ------ ^ (please read the back first Please fill in this page again) R—X—CH〇-CH—CH printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs; (2) (Here, R is the same base as formula (1), X is a CHj ^ O — or one of the divalent groups shown) Unsaturated glycidyl ethers shown, and the general formula (3) This paper scale is applicable to China National Standard (CNS) A4 specification (210X297 mm) Central Standard of the Ministry of Economic Affairs A7 B7 printed by the Bureau ’s Consumer Cooperative V. Description of the invention (7) R1

IR ~ C—CH2 V (3) ......................------------....... Epoxy chain shown Olefins, etc. Specific examples of the (b) unsaturated epoxy monomers are: glycidyl propionate, glycidyl formate, itaconic acid mono- and diglycidyl esters, butane tricarboxylic acid mono-, di- and tri-glycosides Mono- and diglycidyl esters of glycerides, citraconic acid, inward-oriented cis-bicyclo [2.1.1] heptyl- 5-ene-1 2 '3 -dicarboxylic acid (NAG) ® and Diglycidyl ester, inward cis-bicyclo [2,2. 1] heptyl-5-pentene-2-methyl-2,3-dicarboxylic acid (methyl-nagiic acid®) mono- and di-shrinkage Glycerol esters, mono- and diglycidyl esters of allyl succinic acid, glycidyl esters of P-styrene carboxylic acid, allyl glycidyl ether, 2methylallyl glycidyl ether, styrene-P-glycidyl Glycerol ether, 3,4-epoxy-1-butene, 3,4-epoxy-3-methyl-1-butene, 3,4-epoxy-1-pentene, 3,4 An epoxy group 3-methyl-1-pentene, 5, 6-epoxy group 1-hexene, ethylene cyclohexene single oxide and so on. Among them, glycidyl propionate and glycidyl formate are the most popular. (c) Silane monomer having an olefinic unsaturated bond, especially a silane monomer having a hydrolyzable organic group in combination with an olefinic unsaturated bond, such as the following general formulas (4) to (6): R 1 R 2 S i Y 1 Y 2 (4) --------- ί outfit ------ order ------ {line (please read the notes on the back before filling this page ) This paper scale applies the Chinese National Standard (CNS) A4 specification (210X297mm) _ _ A 7 B7 (5 (6 V. Description of the invention (8) R 1 XS i Y 1 Y 2 as shown in the above formula ( 4) ~ (6), R1 and R2 may be rich or different, with an olefinic unsaturated bond, a monovalent group formed by carbon, hydrogen and any ubiquitous oxygen. X is a non-olefinic unsaturated bond Organic groups such as methyl, ethyl, propyl, tetradecyl, deca / 1, phenyl, sulfanyl, tolyl and other groups of monovalent hydrocarbon groups, and these groups are halogen groups ® Substituted hydrocarbon groups are also possible. Y1 'Y2, Y3 are the same or different π hydrolysate groups, specific examples are alkoxy groups such as methoxy, ethoxy, butoxy, methoxyethoxy Ϊ, etc. , Alkoxyalkoxy, Methoxy, Acetyloxy, Propyl Acyloxy groups and oximes such as molybdenum, for example: -0N = (CCH3) 2, -on = chch2c2h5 and -ο N = (CC 6H 5) 2 etc., or substituted amine groups and arylamine groups, For example: -NHC Η 3 '—NHC 2Η 5 and —Ν Η (C βΗ 5) represented by the base, etc., and other organic base paper scales obtained by any arbitrary hydrolysis apply China National Standards (CNS) A4 specifications (210X 297 Mm) -----'------ ^ installed ------ order -------- ^ practice (please read the notes on the back before filling out this page) Central Bureau of Standards, Ministry of Economic Affairs Printed by Employee Consumer Cooperative 11-Printed by the Ministry of Economic Affairs, Central Standards Bureau Employee Consumer Cooperative A7 B7 V. Description of invention (9) Specific examples of the groups represented by R1 and R2 in the aforementioned formulas (4) to (6) are vinyl and vinyl Propyl, butenyl, cyclohexenyl, cyclopentadienyl, etc., especially terminal olefinic unsaturated groups are preferred. Other preferred examples are ester bonding of terminal unsaturated acids: C Η 2 = C ( C Η 2) COO (C Η 2) 3-C Η 2 = C (C Η a) COO (CH 2) 2-0- (c H 2) 3- CH 2 = C (CH 2) C00CH2CH (OH) CH 2 0 (CH 2) 3- such bases. In these bases Vinyl is the best. As the (c) olefinic unsaturated bonded silane monomer, the compound represented by the formula: R 1 S i γ 1 γ 2 γ 3 is preferred, especially Y1 'Y 2 and Y3 It is preferable that the bases are the same organosilicon compound. Among them, ethylene ginsane alkoxysilane is the best, such as ethylene trimethylsilicon, ethylene ginseng (methoxyethoxy) silane, etc. In addition, ethylene methyl diethoxysilane, vinyl phenyl dimethoxysilane, etc. can be used in the same manner. In the present invention, the denatured non-polar polymer, in particular, the denaturant is preferably graft copolymerized with the non-polar polymer. Graft copolymerization of denaturing agent to non-polar polymer, in the manufacture of graft copolymer, that is, denatured non-polarity conforms to the paper size, the Chinese National Standard (CNS) Α4 specification (210X297 mm) 1〇 ---- ---- ^ Installed ------ ordered ----- 'spicy (please read the notes on the back before filling in this page) A7 B7 printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economy V. Description of invention ( ίο) In the case of things, various methods of Zhou Zhiyou can be used without special restrictions. For example, a method of adding a denaturing agent to graft copolymerize after baking a nonpolar polymer, or a method of dissolving a nonpolar polymer in a solvent and adding a denaturing agent to graft copolymerize. In any method for efficient graft copolymerization, it is preferable to carry out the reaction in the presence of a free radical polymerization initiator. Examples of radical polymerization initiators include organic peroxides, organic peresters, and azo compounds. In addition, during the reaction, irradiation with ionizing radiation, ultraviolet rays, etc. can also generate free radicals. In the present invention, the denatured non-polar polymer can be a denaturant of the aforementioned unsaturated carboxylic acid and its derivatives, (b) unsaturated epoxy monomer, or (C) a silane monomer having an olefinic unsaturated bond Any one of the non-polar polymers that are denatured may be a single type, or a combination of two or more types. Furthermore, one molecule may have denatured by two or more types of (a), (b), or (c). The part can also be. Denatured non-polar polymer, the content rate from the structural unit of the denaturant is 0.005 ~ 10% by weight, preferably 0.01 ~ 5% by weight. The content rate of this structural unit exceeds 5% by weight, using the denatured electrode Polymer, producing electret film and electret non-woven filter material, which saturates the charge density, and the performance of electret can be expected to increase even more. In addition, when it exceeds 20% by weight, the film formation is difficult. In the present invention, the content of a part or all of the thermoplastic resin used in the production of the electret film is denatured non-polar polymer, which is 60% by weight or more, preferably 80% by weight or more. In addition, the thermoplastic resin (please read the precautions on the back before filling out this page). Set. This paper standard is applicable to the Chinese National Standard (CNS) Α4 specification (210Χ297 mm) -13-A7 A7 Central Standard of the Ministry of Economic Affairs B7 printed by the Bureau Staff Consumer Cooperative V. Description of the invention (11) In the case of containing polar polymers, the content is 40% by weight or less, preferably 20% by weight or less. Furthermore, in the present invention, it is used Thermoplastic resins, in addition to the aforementioned non-polar polymers, non-polar polymers and denatured non-polar polymers, can be added as needed, such as heat-resistant stabilizers, weather-resistant stabilizers, slip agents, anti-blocking agents, lubricants , Inorganic or organic fillers, dyes, pigments, etc. In the present invention, the electret nonwoven fabric is manufactured by forming the thermoplastic resin into a film shape with or without stretching, and performing a charge treatment while heating to produce an electret film. Secondly, opening the electret film to obtain open dimensions can be carried out according to the method of forming open fibers into a non-woven fabric. The method of forming the thermoplastic resin into a film shape is not particularly limited, and generally, any method of forming a film from such a resin is applicable. For example, blown film forming method, extrusion forming method using T-film, roll rolling method, etc. In addition, when stretching, the stretching process is usually above the softening point or below the melting point of the polymer compound constituting the film, for example, heating to about 110 ~ 150 composition, using a roller, hot plate, furnace, etc., in the longitudinal direction of the film Direction. In this case, the drawing magnification is usually about 5 to 10 times, and the forming stability is good, and it is easy to open the fiber, preferably about 6 to 8 times. The electret treatment may be performed during film formation, and after electret formation, the nonwoven fabric may be performed by an electret method. Here, when electret polarization is performed during film formation, since the efficiency of electret polarization is good, the removal performance is better than that of non-woven electret polarization after molding, which is preferable. This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) (please read the notes on the back before filling out this page) Binding-Order A7 B7 printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 12) The electret system can apply DC voltage to the non-woven fabric or film. The value of the applied DC voltage can be appropriately selected according to the shape of the electrode used, the distance between the electrodes, etc., or the amount of charged electric charge required by the electret nonwoven fabric, the processing speed, etc. For example, when the distance between the electrodes is 8 mm, at least -5 kV, preferably _6--20 kV DC voltage can be applied to the non-woven fabric. The application of the DC voltage can be performed by any method, and there is no particular limitation. For example, a method of passing a non-woven fabric or film through a pair of electrodes to which a DC voltage is applied; a method of applying a corona discharge or a pulse-like high voltage to the surface of the non-woven fabric; a method of applying a DC high voltage on both sides of the surface of the non-woven fabric with other dielectrics. Any other method is acceptable. The temperature of the embossing roller in the heating and nip process is the temperature of the softening point of the thermoplastic resin, which is preferably 5 to 50 ° C lower than the softening point, and more preferably 2 to 0 lower than the softening point 3 Temperature of 0 ° C. When the embossing roller is processed at a temperature exceeding the softening point of the thermoplastic resin, the improvement of the mechanical strength of the electret nonwoven fabric is effective, but there is a risk of loss of charge maintained by the electret nonwoven fabric. When the embossing roller is processed at a temperature higher than 50 ° C than the softening point, there is a possibility that an electret nonwoven fabric having sufficient mechanical strength cannot be obtained. For example, using polypropylene as the electret non-woven fabric of thermoplastic resin, its softening point is about 155 ° C, and the heating and nip treatment of the embossing roller is carried out at a temperature of about 100 0 ~ 150 ° C , The best is about 1 1 5 ~ 1 3 5 ° C temperature. Through the heating and pinching treatment of the embossing roller, the electret nonwoven fabric is softened and thermal fusion is performed throughout, and the determined mechanical strength is found. At this time, it is only connected to the electrified non-woven fabric (please read the precautions on the back before filling in this page)-Binding · Thread This paper size is applicable to China National Standard (〇 阳) 84 specifications (2 丨 0/297 %) _ 15_ A7 B7 printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs V. Invention Description (13) The convex portion of the embossing roller is melted by the pressurized surface (embossed surface) without blocking the convex At the surface (non-embossed part) and inside, the charge remains trapped, and an electrified non-woven filter with excellent removal performance can be obtained. In addition, when the embossing roller is heated and pinched, the open dimension of the molten electrified nonwoven fabric enters the non-melted portion, and the electret nonwoven fabric is strongly integrated, which is effective for preventing self-dusting. In the present invention, the unit area of the embossing section of the embossing roller system used for heating and nip processing is 0. 05 ~ 5m πί, preferably 0. 1 ~ 3mnf, and the embossing area ratio is 2 ~ 3 0% , Preferably 3 ~ 10%. In addition, the number of embossing per unit area is about 0.1 to 1.5 pieces / mirf. Furthermore, the shape of the embossing portion is a cross-sectional shape with a height of 0.1 to 1.0 mm platform, rectangle, etc., and the top is With round, rectangular, square, diamond and other shapes. Using this embossing roller, an embossed portion corresponding to the electret nonwoven fabric was formed. The embossing rate of the filter, that is, the ratio of the embossed portion to the entire surface of the filter is 2 to 30%, preferably 3 to 10%. When the embossing rate of the filter exceeds 30%, the pressure loss will increase, and the dust capture ability of the filter will not be reduced well. On the one hand, if it is less than 2%, the integration of the mesh is not sufficient, so it is not good . The filter of the present invention manufactured by integrating the electret nonwoven fabric into a sheet shape by the pressing and pinching treatment of the embossing roller is usually wound into a reel at a winding speed of 1 to 2 〇m / m η shape. The instrument of the present invention has a high removal efficiency, and its removal efficiency is excellent in long-term stability. At the same time, the contact portion of the electret non-woven fabric and the mesh is thermally fused throughout to have an integrated structure and excellent mechanical strength. Therefore, the size of this paper is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) _ 16 _ (please read the precautions on the back before filling in this page) Binding · Order A7 2W〇62 _ B7 5. Description of the invention (14) 'The filter of the present invention does not cause cracking, elongation, etc. during secondary processing, and is excellent in handleability during secondary processing. In addition, according to the method for manufacturing an electret nonwoven fabric filter material of the present invention, all the charge of the electret nonwoven fabric material is not lost, and the filter material of the aforementioned structure can be manufactured, which is effective. Examples Hereinafter, the present invention will be described more specifically by way of examples and comparative examples, but the present invention is not limited by these examples. In addition, the removal efficiency, retention rate and pressure loss measured in the examples and comparative examples can be measured by the following method. (a) Removal efficiency, retention rate The removal efficiency was measured using the measuring device shown in FIG. First, an aerosol generator (manufactured by Nippon Science and Industry Corporation) 1 supplies NaCi particles (particle size: 0.3 #m), and at the same time, clean air passing through the air filter 2 is supplied to the chamber 3. After the concentration of NaCj? Particles in the chamber 3 becomes a certain concentration (2 ~ 6xlOe), the blower 4 is operated, and the gas in the chamber 3 passes through the flow path 5, and the flow rate is adjusted by the flow regulating valve 6 to attract it. When the passing wind speed measured by the velocimeter 7 becomes a certain speed (1.0 Om / sec), it is arranged in the flow path 5 and is N a C j in the upstream and downstream sides of the electret non-woven filter material 8 to be measured ? Particle concentration C i η and Cou t are measured by a particle counter (manufactured by Rion, KC-01 B) 9 a and 9b, respectively. According to the measurement results (please read the precautions on the back before filling in this page). Binding. _ Printed by the Ministry of Economic Affairs Central Standards Bureau Employee Consumer Cooperative. The paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) ~ 17 -A7 B7 printed by the employee consumer cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. The invention description (15), the removal efficiency can be obtained according to the following formula. Removal efficiency = [l- (Cout / Cin)] xl〇〇 (%) In addition, let the removal efficiency at this time be the initial value Eι, make the same electret non-woven filter material, at 60 ° C 'relative humidity: 80% After the 48-hour accelerated test, the removal efficiency E2 was measured again, and the retention rate of the removal efficiency was determined according to the following formula. Retention rate = (E2 / E1) X100 (%) (b) Pressure loss In the measuring device shown in Fig. 1, a differential pressure gauge 1 〇 was used to measure the electrified non-woven fabric at a passing wind speed of 1 · 〇m / sec The pressure loss of the filter 8 on the upstream side and the downstream side. (Examples 1 to 3, Comparative Examples 1 to 2) (Production of electret nonwoven fabric) The raw material resin or raw resin mixture shown in Table 1 was blended using a blown film forming machine (manufactured by Toshiba Machine (Company), 3 0 Extruder, 80 mm &lt; / &gt; die), forming temperature: 240 ° C, extruder spiral rotation number: forming under the forming condition of 5 4 r pm, the resulting bending width is 3 5 Omm, thickness 3 0 ~ 4 0 // m of the tubular film is continuously cut at both ends to produce two films with a width of 300 mm. J n ί Binding ^ Practice (please read the precautions on the back before filling in this page) This paper size is applicable to China National Standard (CNS) Α4 specifications (210X29 * 7mm) _ 18 _ B7 V. Description of invention (16) will The resulting film is stretched by rollers at a temperature of 110 to 120 ° C at an extension ratio of about 6 to 8 times to become a stretched film with a thickness of 1 1 0 to 2 mm. On the stretched film, the following Under the conditions, electrify the polarization by corona discharge to obtain the electrification film》 Applied voltage: 12kV (DC)

Electrode interval: 27mm Temperature: 2 0 ° C Residence time of corona discharge electrode: 0.8 seconds Change the ratio of the roller rotation speed relative to the film supply speed, and open the extended electret film into a mesh with a needle roller Eye-shaped, rolled into a drum shape. Next, the opening dimension is cut into a fiber length of 7 Omm, and after opening with an opener, it is supplied to a web-dorming machine 'and formed into an electret network. II HI nn ^ i I (Please read the precautions on the back before filling out this page) The paper standard printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs is applicable to the Chinese National Standard (CNS) A4 (210X 297mm) A7 B7 1. Description of the invention (17) Table 1

Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs I Fiber raw material resin or resin composition (content ratio) Average fiber diameter (width) Embossed amount (ju m) (g / πί) 1 Polypropylene 68 25 2 Polypropylene PP / Anhydrous maleic acid modified PP / polycarbonate (90/5/5) 60 25 3 homogenous PP / anhydrous maleic acid modified PP / polycarbonate (90/5/5) 102 25 4 homogenous PP / anhydrous Maleic acid modified PP (95/5) 60 25 This paper scale is applicable to China National Standard (CNS) A4 specification (210X297 mm) _ go J —----- ^ -installation ------ order-- --- ^ Line (please read the precautions on the back before filling in this page) · A7 _______B7 V. Description of invention (is) Table 1 Description of resin

Homogenous polypropylene: MFR: 0.5 g / min (ASTM D 1 2 3 8) Density: 0 · 91g / cm3 Anhydrous maleic acid-modified polypropylene: Anhydrous maleic acid is graft-copolymerized on the same homopolypropylene The denatured person (graft ratio: 3% by weight) polycarbonate: Lexan 1 0 1 resin composition manufactured by General Electric Company was prepared using a tumbler mixor. The electret web was supplied to an embossing roller, and under the conditions shown in Table 2, heat and nip treatment were performed to thermally fuse the electret web to obtain an electret nonwoven filter material. Regarding the obtained electret non-woven filter, the removal efficiency, pressure loss and retention rate were measured, and the results are shown in Table 2. "I --- ^ ----- f. Packing ------ booking ---- -4-k line (please read the precautions on the back before filling in this page) The paper standard printed by the Employee Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs is applicable to the Chinese National Standard (CNS) A4 specification (210x297mm) -21

Α7 7 B V. Description of the invention (/?) Table 2 Fusion conditions removal performance Fiber fusion embossing unit area embossing rate removal efficiency pressure loss retention rate (mm2) (¾) * (¾) (mmH2〇) ⑻ Examples 1 2 Embossing 0.12 5.0 19 2.0 90 Example 2 4 Embossing 0.3 9.0 23 2.5 91 Example 3 4 Embossing 0.12 5.0 15 2.0 87 Comparative Example 1 1 Embossing 0.12 5.0 15 2.6 60 Comparative Example 2 3 Embossing 0.12 1.0 _ * 本 _ 本本 _ 木 氺 I n! 丨 '^ Clothing (please read the precautions on the back before filling out this page). Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs *: Passing wind speed 1 0 0 cm / Measurement under sec conditions &quot;: Unmanufacturable non-woven paper size is applicable to China National Standard (CNS) A4 specification (210 X 297 mm)

Claims (1)

A8 B8 C8 D8 printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 々, patent application 1. An electret nonwoven filter material, characterized by being selected from (a) unsaturated carboxylic acid and its derivatives, (b) unsaturated 005〜 Epoxy monomers, and (c) at least one denaturant grouped with olefinic unsaturated bonded silane monomers is partially or fully denatured, and contains structural units from the denaturant 0. 005 ~ 5% by weight of a non-polar polymer as the main component of a thermoplastic resin formed by electrification film formed by opening fiber obtained by opening fiber. 2. An electret non-woven fabric filter material as claimed in item 1 of the patent application, wherein the thermoplastic resin contains 40% by weight or less of a polar polymer. 3. For the electrified non-woven fabric filter material according to item 1 of the patent application, wherein the average fiber diameter or average width of the aforementioned open fibers is less than 80 m. 4. A method for manufacturing electret non-woven filter material, which has the following processes: (a) unsaturated carboxylic acid and its derivatives, (b) unsaturated epoxy monomer and (c) silane with olefinic unsaturated bonding At least one denaturant grouped by monomers is partially or fully denatured, and is made of a thermoplastic resin containing a non-polar polymer as a main component containing a structural unit of 0.005 to 5 wt% from the denaturant. The electret film was opened to obtain the electret non-woven fabric formed by the open mesh, which was supplied to the embossing roller with a unit area of 0. 05 ~ 5mrri in the embossing section, and the embossing area ratio was 2 ~ 30%. It is heated and clamped at a temperature where the thermoplastic resin is not full of the softening point, so that the electret nonwoven fabric is thermally fused and integrated. This paper scale is applicable to China National Standard (CNS & A4 specifications (210X297mm) _ 23-(please read the precautions on the back before filling out this page).