Deodorizing filter material

Abstract

The invention discloses a deodorization filter material which comprises a supporting layer, a deodorization layer and an antibacterial melt-blown non-woven fabric layer, and the deodorization layer contains 5-40 wt% of activated carbon containing metal cations, 5-20 wt% of activated carbon containing acid radical ions and 5-40 wt% of amine compound added carriers. The deodorization filter material disclosed by the invention not only has a high odor removal rate, but also has the characteristics of high antibacterial rate and capability of inhibiting secondary odor after being used for a long time, and can be applied to the field of air filtration.

Description

Technical Field

[0001] The present invention relates to a deodorizing filter medium. Background Art

[0002] With the progress of the times, air pollution has become increasingly serious, and people's requirements for the quality of the living environment have gradually increased. Therefore, air purification products are used more and more widely, such as household air purifiers, central air-conditioning air purification systems, automotive air-conditioning filters, masks, etc. Since purifiers are consumable household appliances, after long-term use, the filter media in the purifiers adsorb a large amount of harmful gases and dust, and are prone to generate secondary odors. In particular, purifiers using ordinary filter media have no antibacterial effect, and will become a breeding ground for bacteria and fungi after long-term use, causing secondary pollution.

[0003] For example, Chinese Patent Publication No. CN103861558A discloses an air filtration material containing activated carbon and its production method. Although the filter medium containing activated carbon can remove solid particles such as dust, organic gases, and acidic and alkaline harmful gases, that is, based on the physical adsorption ability of activated carbon, the above gas components are not adsorbed by chemical methods, so affected by environmental factors such as temperature and humidity changes, the released odor components emit a foul smell, which will cause secondary odors during use.

[0004] Another example is Chinese Patent Publication No. CN108635965A, which discloses a filter medium with the function of removing smoke odor. Although the filter medium has a good removal effect on acidic and alkaline gases, the deodorizing layer only has a physical adsorption effect on aldehyde gases and the adsorption efficiency is low. In addition, the filter medium uses conventional meltblown and does not have antibacterial effects, and is also prone to generate secondary odors after long-term use. Summary of the Invention

[0005] The purpose of the present invention is to provide a deodorizing filter medium that not only has a high removal rate of odors, but also has a high antibacterial rate and can inhibit secondary odors after long-term use.

[0006] The technical solution of the present invention is as follows: The filter medium of the present invention includes a support layer, a deodorizing layer, and an antibacterial meltblown non-woven fabric layer. The deodorizing layer contains 5-40% by weight of activated carbon containing metal cations, 5-20% by weight of activated carbon containing acid radical ions, and 5-40% by weight of an amine compound-impregnated carrier.

[0007] The beneficial effects of the present invention: The deodorizing filter medium of the present invention not only has a high removal rate of odors, but also has a high antibacterial rate and can inhibit secondary odors after long-term use. The deodorizing filter medium of the present invention can be applied to the field of air filtration. Detailed Embodiments

[0008] The deodorizing filter material of the present invention includes a support layer, a deodorizing layer, and an antibacterial melt-blown non-woven fabric layer. The deodorizing layer contains 5-40% by weight of activated carbon containing metal cations, 5-20% by weight of activated carbon containing acid radical ions, and 5-40% by weight of an amine compound adhering carrier.

[0009] The above-mentioned support layer is preferably a thermally bonded non-woven fabric. Since the papermaking non-woven fabric contains a large amount of water-soluble adhesives, such as acrylic resin, which has a pungent odor, it is not preferred.

[0010] In the above-mentioned deodorizing layer, due to the rich slender pores on the surface of the activated carbon, on the one hand, physical adsorption is realized in the pores by the force between molecules, and on the other hand, chemical adsorption is realized by adding a medicament containing metal cations and a medicament containing acid radical ions inside the small pores of the activated carbon. If the deodorizing layer uses activated carbon without added medicament, relying entirely on physical adsorption, after long-term use, when the odor physically adsorbed by the activated carbon is saturated, the odor will be released again, resulting in secondary odor generation. The metal cations and acid radical ions in the deodorizing layer are present in different activated carbons and will not react with each other. The content of the activated carbon containing metal cations is 5-40% by weight, and the content of the activated carbon containing acid radical ions is 5-20% by weight. The activated carbon containing metal cations is alkaline and can adsorb acidic gases; the activated carbon containing acid radical ions is acidic and can adsorb alkaline gases. If the content of the activated carbon containing metal cations is less than 5% by weight, the adsorption amount of acidic gases is too low to fully adsorb the acidic gases in the odor; if it is greater than 40% by weight, although the deodorizing layer has a high adsorption amount of acidic gases, the addition amounts of the activated carbon containing acid radical ions and the amine compound adhering carrier will be relatively reduced, resulting in a low adsorption amount of alkaline and aldehyde gases. If the content of the activated carbon containing acid radical ions is less than 5% by weight, the adsorption amount of alkaline gases is low; if it is greater than 20% by weight, although the deodorizing layer has a high adsorption amount of alkaline gases, the contents of the activated carbon containing metal cations and the amine compound carrier will be reduced, resulting in too low adsorption amounts of acidic and aldehyde gases. Considering the high adsorption rate of gases, the deodorizing layer preferably contains 20-30% by weight of the activated carbon containing metal cations and preferably contains 10-20% by weight of the activated carbon containing acid radical ions.

[0011] The deodorizing layer of the present invention contains 5 to 40% by weight of an amine compound-attached carrier. The amine compound can chemically adsorb aldehydes. The carrier is preferably porous particles of iron trioxide, titanium dioxide, manganese dioxide or silica. Since the porous silica particles are a collection of tiny particles, they have a larger surface area, sufficient voids, and are not easily blocked. Therefore, when the amine compound agent is added to the porous particle polymer, the aldehyde gas reacts with the amine compound agent, so that the deodorizing layer adsorbs more aldehyde gas. If the content is less than 5% by weight, the adsorption amount of aldehyde gas is low, and the effective area of the reaction field as an added drug cannot be ensured, resulting in secondary odor generation of water-soluble odor components. If the content is greater than 40% by weight, although the deodorizing layer has a high adsorption amount of aldehyde gas, the amount of activated carbon attached with metal cations and acid radicals is correspondingly reduced. Therefore, the adsorption amount of acidic and alkaline gases is low, resulting in low air purification ability of the filter material. Considering the high adsorption rate of gases, the deodorizing layer preferably contains 20 to 30% by weight of an amine compound-attached carrier.

[0012] The above metal cations are preferably at least one of sodium ions, potassium ions, aluminum ions, and copper ions. The metal cations are derived from alkali metal compound agents. Considering that no pollution is generated to the environment after reacting with acidic gases, and the stronger the metallicity, the stronger the alkalinity, aluminum hydroxide agent or sodium carbonate agent is preferred. Since hydroxide and carbonate are alkaline and hydrogen ion is acidic, the hydroxide ion and hydrogen ion neutralize to form water, and the carbonate and hydrogen ion neutralize to produce water and carbon dioxide. The metal ion and chloride ion form a salt.

[0013] The above acid radicals are preferably at least one of bicarbonate, chlorate, phosphate, and nitrate. Considering that no pollution is generated to the environment after reacting with alkaline gases, hydrochloric acid agent, sulfuric acid agent or phosphoric acid agent is preferred.

[0014] To improve the formaldehyde removal performance, the amine compound of the present invention is preferably at least one of aniline, methylene triamine, aminoguanidine, and acrylamide. Considering that the product is not easily volatile after reacting with aldehyde gas, the amine compound is more preferably aniline, acrylamide or methylene triamine, and further preferably acrylamide.

[0015] The grammage of the above deodorizing layer is preferably 150 to 500 g / m 2 . If the grammage of the deodorizing layer is too low, the filter material cannot effectively remove the odor in the air and has a short service life. If the grammage of the deodorizing layer is too high, the resistance of the filter material is large, and there are easily phenomena of carbon leakage and meltblown breakage during the processing of the filter material.

[0016] The average pore diameter of the above-mentioned activated carbon is preferably 2 to 50 nm. By making the average pore diameter 2 nm or more, more preferably 10 nm or more, gas is easily diffused into the pores and reacts sufficiently with the agent attached to the activated carbon; by making the average pore diameter 50 nm or less, more preferably 30 nm or less, the number of pores is large and the pore surface area is large, ensuring more gas adsorption.

[0017] The pore volume of the above-mentioned carrier is preferably 1 ml / g or more. The carrier refers to a single-particle aggregate, and aldehyde gas is chemically adsorbed by an amine compound, which can inhibit the secondary odor of water-soluble odor components. If the pore volume of the carrier is too small, the adsorbed aldehyde gas is very little, and an excessive amount of activated carbon is required to meet the general formaldehyde removal requirements, which will lead to an increase in the resistance of the filter material and a decrease in the filtration performance.

[0018] The above-mentioned antibacterial melt-blown non-woven fabric layer preferably contains antibacterial electret masterbatch. The antibacterial melt-blown non-woven fabric has good antibacterial effects. After the filter material is used for a long time, it can adsorb a large amount of dust and odor, inhibit the growth of bacteria and fungi, and reduce the secondary odor generated by the filter material. If the non-woven fabric is an ordinary melt-blown non-woven fabric, it is more likely to breed bacteria and fungi after long-term use in a warm and humid environment, resulting in complex and unpleasant odors.

[0019] The above-mentioned antibacterial electret masterbatch preferably contains a metal or metal oxide, and the metal oxide is preferably an oxide formed by one or more selected from copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum, and tungsten. Considering the stable physical and chemical properties, high temperature resistance, and low cost, the metal oxide is preferably alumina, zinc oxide, or copper oxide.

[0020] The preparation method of the deodorizing filter material of the present invention preferably includes the following steps:

[0021] (1) Preparation of the support layer: Mix and card ordinary polyester fiber, core-sheath type polyester fiber, and functional polyester fiber into a web. Using a thermoplastic polymer, after the fiber web is heated, the fibers or hot-melt powders on the surface of the core-sheath type polyester fiber are softened and melted, and adhesion occurs between the fibers. After cooling and strengthening, a thermally bonded non-woven fabric is obtained;

[0022] (2) Preparation of the deodorizing layer: After the coconut shell activated carbon is activated by steam, an alkaline agent and an acidic agent are added into the pores of the activated carbon to obtain activated carbon particles. Then, an amine compound is added to the porous particle carrier to obtain an amine compound-added carrier. Then, the activated carbon particles, the amine compound-added carrier, and the rubber powder are uniformly mixed in proportion to obtain a mixed activated carbon;

[0023] (3) Preparation of the antibacterial melt-blown non-woven fabric layer: Using the melt-blown process, put the polyester chips mixed with metal oxides into the hopper. After the chips are melted at high temperature by a screw extruder and extruded, they are then drawn into short fibers by hot air and formed into an antibacterial melt-blown non-woven fabric after laying the web;

[0024] (4) Preparation of the deodorizing filter medium: First, evenly sprinkle an adhesive on the thermally bonded non-woven fabric, then evenly sprinkle the mixed activated carbon. Heat it in an oven at 120 - 160 °C for 20 - 30 s to melt the adhesive, and then cover the mixed activated carbon with an antibacterial melt-blown non-woven fabric layer to finally obtain the deodorizing filter medium of the present invention.

[0025] The present invention will be described in more detail through the following examples and comparative examples. However, the protection scope of the present invention is not limited to the examples, and the physical properties in the examples are measured by the following methods.

[0026]

Content of activated carbon containing metal cations

[0027] Take a 10 cm × 10 cm filter medium sample, put it in an oven and heat it at 160 °C for 5 min. Then peel off the support layer and the melt-blown layer of the filter medium to obtain the deodorizing layer. Then weigh 10 g of the deodorizing layer and place it in a triangular flask. Pour 5% hydrochloric acid, mix it under electromagnetic stirring for 30 min, wash it with distilled water, separate it by precipitation method, and wash it repeatedly. Calculate the weight M1 of the added 5% hydrochloric acid, and thus calculate the content M2 of the activated carbon containing metal cations. The calculation formula is as follows:

[0028]

Content of activated carbon containing acid radical ions

[0029] Take a 10 cm × 10 cm filter medium sample, put it in an oven and heat it at 160 °C for 5 min. Then peel off the support layer and the melt-blown layer of the filter medium to obtain the deodorizing layer. Then weigh 10 g of the deodorizing layer and place it in a triangular flask. Pour 3% caustic alkali, mix it under electromagnetic stirring for 30 min, wash it with distilled water, separate it by precipitation method, and wash it repeatedly. Calculate the weight M2 of the added 3% caustic alkali, and thus calculate the content M3 of the activated carbon containing acid radical ions. The calculation formula is as follows:

[0030]

Content of the carrier with amine compound added

[0031] Take a 10 cm × 10 cm filter medium sample, put it in an oven and heat it at 160 °C for 5 min. Then peel off the support layer and the melt-blown layer of the filter medium to obtain the deodorizing layer. Then weigh 10 g of the deodorizing layer and place it in a triangular flask. Add hydrofluoric acid to the mixed deodorizing layer. The hydrofluoric acid will dissolve the multi-particle polymer carrier, and calculate the weight M4 of the added hydrofluoric acid. Thus, the content of the carrier with amine compound added is obtained. The calculation formula is as follows:

[0032]

Gram weight of the deodorizing layer

[0033] Take a 10 cm × 10 cm filter media sample, place it in an oven and heat at 160 °C for 5 min. Then peel off the support layer and the meltblown layer of the filter media, and weigh the obtained deodorizing layer.

[0034]

Average pore diameter of activated carbon

[0035] Take a 10 cm × 10 cm filter media sample, place it in an oven and heat at 160 °C for 5 min. Then peel off the support layer and the meltblown layer of the filter media to obtain the deodorizing layer. Weigh 10 g of the deodorizing layer and place it in a conical flask. Add hydrofluoric acid to the mixed deodorizing layer. The hydrofluoric acid will dissolve the multi-particle polymer carrier. The remaining sample is rinsed with distilled water and dried to obtain activated carbon. Place the activated carbon in a conical flask, pour 5% hydrochloric acid and 3% caustic soda respectively, mix for 30 min under magnetic stirring, wash with distilled water, separate by precipitation method, and wash repeatedly until the washing water is neutral (methyl orange test) to obtain activated carbon without added agents. Then use the nitrogen adsorption method: Select 10 g of activated carbon. At the liquid nitrogen temperature, the adsorption amount of nitrogen on the solid surface depends on the relative pressure of nitrogen (P / P0), where P is the partial pressure of nitrogen and P0 is the saturated vapor pressure of nitrogen at the liquid nitrogen temperature. When P / P0 is in the range of 0.05 - 0.35, the adsorption characteristics of the sample conform to the BET equation. When P / P0 ≥ 0.4, due to the occurrence of capillary condensation phenomenon, that is, nitrogen begins to condense in the pores of the particles, use the isothermal adsorption characteristic curve of nitrogen and the NLDFT analysis model to calculate the pore diameter of the activated carbon.

[0036]

Pore volume of the carrier

[0037] Take a 10 cm × 10 cm filter media sample, place it in an oven and heat at 160 °C for 5 min. Then peel off the support layer and the meltblown layer of the filter media to obtain the deodorizing layer. Then add deionized water and place it in the oven to dry. After that, a thin and brittle layer of carbon will adhere to the silica. Scrape off the carbon with a spatula to obtain the carrier without added agents. Then use the nitrogen adsorption method: Select 10 g of the carrier. At the liquid nitrogen temperature, the adsorption amount of nitrogen on the solid surface depends on the relative pressure of nitrogen (P / P0), where P is the partial pressure of nitrogen and P0 is the saturated vapor pressure of nitrogen at the liquid nitrogen temperature. When P / P0 is in the range of 0.05 - 0.35, the adsorption characteristics of the sample conform to the BET equation. When P / P0 ≥ 0.4, due to the occurrence of capillary condensation phenomenon, that is, nitrogen begins to condense in the pores of the particles, use the isothermal adsorption characteristic curve of nitrogen and the t2plot method to calculate the pore volume of the carrier.

[0038]

Odor removal efficiency

[0039] Pass the odor gas stream at a flow rate of 0.1 m / s through a size of 8 cm 2For the sample, measure the odor volume M1 (ppm) before passing the sample through the test, and measure the odor volume M2 after passing the sample through the test 30 minutes after ventilation. Calculate the odor removal efficiency according to the following calculation formula, and the calculation formula is as follows:

[0040]

Secondary odor index

[0041] Select a place far away from the malodorous smell, indoors with a temperature of 20 - 26 °C and capable of ventilation. Place a circular filter media sample with a size of 301 cm 2 into a metal jig to fix it inside the purifier. Place the purifier equipped with the test filter media in a 3 m 3 chamber. Keep the purifier turned on, and then sequentially add acetic acid and yeast solution to the acetic acid and yeast generator, allowing them to volatilize and be absorbed by the filter media to achieve the purpose of pollutant loading. Move the purifier after the loading and adsorption is completed to an ordinary 3 m 3 chamber, turn it on and operate for 2 - 3 weeks. Finally, clean the chamber, collect the gas at the air outlet of the purifier, and then select 6 - 7 panelists aged 18 - 45 years old, non-smokers with normal sense of smell, and score according to the following odor levels. Finally, summarize and calculate the average value. The odor levels are as follows:

[0042] Level 5: Strongly pungent smell, extremely uncomfortable;

[0043] Level 4: Obvious smell, strongly uncomfortable;

[0044] Level 3: Obvious smell, slightly uncomfortable;

[0045] Level 2: Slight smell, but can be felt, slightly uncomfortable;

[0046] Level 1: Slight smell, but can be felt, no discomfort;

[0047] Level 0: No smell.

[0048]

Bacteriostatic rate

[0049] Take 1 g of the test sample, place it for 24 hours under the conditions of a temperature of 23 ± 3 °C and a humidity of 50 ± 5% RH, and perform high-pressure sterilization treatment. Then inoculate 0.2 ml of a mixed solution of Staphylococcus aureus and Escherichia coli. The initial bacterial solution concentration is C1. After 24 hours of inoculation, the bacterial solution concentration is C2. The calculation formula for the bacteriostatic rate is as follows:

[0050]

[0051] Example 1

[0052] (1) Preparation of the support layer: Mix ordinary polyester fiber, core-sheath type polyester fiber, antibacterial polyester fiber, and flame-retardant polyester fiber, card them into a web, cool and reinforce to obtain a thermally bonded non-woven fabric;

[0053] (2) Preparation of the deodorizing layer: First, coconut shell activated carbon with an average pore diameter of 30 nm is activated by steam. Then, 30 g of sodium carbonate reagent and 30 g of hydrochloric acid reagent are dissolved in water until the solution is transparent, sprayed onto 100 g of activated carbon, stirred evenly for 30 min, and then dried to obtain activated carbon containing sodium carbonate reagent and activated carbon containing hydrochloric acid reagent. Then, 10 g of acrylamide reagent is dissolved in water until the solution is transparent, sprayed onto 100 g of silica particles with an average pore diameter of 1.2 ml / g, stirred evenly for 30 min, and then dried to obtain acrylamide-impregnated silica. Then, the activated carbon containing sodium carbonate reagent, the activated carbon containing hydrochloric acid reagent, the acrylamide-impregnated silica, and a polyethylene resin adhesive are mixed according to a weight ratio of 40:15:25:20 to obtain a mixed activated carbon;

[0054] (3) Preparation of the antibacterial meltblown nonwoven fabric layer: Using the meltblown process, polypropylene resin chips containing zinc oxide are put into the hopper. The chips are extruded after being melted at a high temperature by a screw extruder, and then drawn into short fibers by hot air. After laying the web, an antibacterial meltblown nonwoven fabric is formed;

[0055] (4) Preparation of the filter medium: First, a layer of 7 g / m 2 of polyethylene resin powder is evenly sprinkled on the thermally bonded nonwoven fabric. Then, the mixed activated carbon is evenly sprinkled on the thermally bonded nonwoven fabric at 150 g / m 2 . After heating in an oven at 120 °C for 20 s, the antibacterial meltblown nonwoven fabric is covered on the mixed activated carbon, and finally the deodorizing filter medium of the present invention is obtained. The parameters and physical properties of each component in the filter medium are shown in Table 1 below.

[0056] Example 2

[0057] The preparation processes of the support layer, the antibacterial meltblown nonwoven fabric layer, and the filter medium are the same as those in Example 1. The specific formulations and physical properties are shown in Table 1.

[0058] Preparation of the deodorizing layer: First, coconut shell activated carbon with an average pore diameter of 15 nm is activated by steam. Then, 30 g of sodium carbonate reagent and 30 g of hydrochloric acid reagent are dissolved in water until the solution is transparent, sprayed onto 100 g of activated carbon, stirred evenly for 30 min, and then dried to obtain activated carbon containing sodium carbonate reagent and activated carbon containing hydrochloric acid reagent. Then, 10 g of acrylamide reagent is dissolved in water until the solution is transparent, sprayed onto 100 g of silica particles with an average pore diameter of 1.2 ml / g, stirred evenly for 30 min, and then dried to obtain acrylamide-impregnated silica. Then, the activated carbon containing sodium carbonate reagent, the activated carbon containing hydrochloric acid reagent, the acrylamide-impregnated silica, and a polyethylene resin adhesive are mixed according to a weight ratio of 40:10:20:30 to obtain a mixed activated carbon. The parameters and physical properties of the deodorizing filter medium of the present invention are shown in Table 1 below.

[0059] Example 3

[0060] The preparation processes of the support layer, antibacterial melt-blown non-woven fabric layer, and filter medium are the same as those in Example 1, and the specific formulations and physical properties are shown in Table 1.

[0061] Preparation of the deodorizing layer: First, coconut shell activated carbon with an average pore diameter of 15 nm is activated by steam. Then, 30 g of sodium carbonate reagent and 30 g of hydrochloric acid reagent are dissolved in water until the solution is transparent, sprayed on 100 g of activated carbon, stirred evenly for 30 min, and then dried to obtain activated carbon containing sodium carbonate reagent and activated carbon containing hydrochloric acid reagent. Then, 10 g of acrylamide reagent is dissolved in water until the solution is transparent, sprayed on 100 g of silica particles with an average pore diameter of 1.2 ml / g, stirred evenly for 30 min, and then dried to obtain acrylamide-impregnated silica. Then, the activated carbon containing sodium carbonate reagent, the activated carbon containing hydrochloric acid reagent, acrylamide-impregnated silica, and a polyethylene resin binder are mixed in a weight ratio of 40:5:35:20 to obtain a mixed activated carbon. The physical properties of the various parameters of the deodorizing filter medium of the present invention are shown in Table 1 below.

[0062] Example 4

[0063] The preparation processes of the support layer, antibacterial melt-blown non-woven fabric layer, and filter medium are the same as those in Example 1, and the specific formulations and physical properties are shown in Table 1.

[0064] Preparation of the deodorizing layer: First, coconut shell activated carbon with an average pore diameter of 15 nm is activated by steam. Then, 30 g of sodium carbonate reagent and 30 g of hydrochloric acid reagent are dissolved in water until the solution is transparent, sprayed on 100 g of activated carbon, stirred evenly for 30 min, and then dried to obtain activated carbon containing sodium carbonate reagent and activated carbon containing hydrochloric acid reagent. Then, 10 g of acrylamide reagent is dissolved in water until the solution is transparent, sprayed on 100 g of silica particles with an average pore diameter of 1.2 ml / g, stirred evenly for 30 min, and then dried to obtain acrylamide-impregnated silica. Then, the activated carbon containing sodium carbonate reagent, the activated carbon containing hydrochloric acid reagent, acrylamide-impregnated silica, and a polyethylene resin binder are mixed in a weight ratio of 20:20:40:20 to obtain a mixed activated carbon. The physical properties of the various parameters of the deodorizing filter medium of the present invention are shown in Table 1 below.

[0065] Example 5

[0066] The preparation processes of the support layer, antibacterial melt-blown non-woven fabric layer, and filter medium are the same as those in Example 1, and the specific formulations and physical properties are shown in Table 1.

[0067] Preparation of deodorizing layer: First, activate coconut shell activated carbon with an average pore diameter of 15 nm by steam. Then, dissolve 30 g of potassium carbonate reagent and 30 g of sulfuric acid reagent in water until the solution is transparent. Spray it on 100 g of activated carbon, stir evenly for 30 min, and then dry to obtain activated carbon containing potassium carbonate reagent and activated carbon containing sulfuric acid reagent. Then, dissolve 10 g of aniline reagent in water until the solution is transparent. Spray it on 100 g of silica particles with an average pore diameter of 1.2 ml / g, stir evenly for 30 min, and then dry to obtain aniline-impregnated silica. Then, mix the activated carbon containing potassium carbonate reagent, the activated carbon containing sulfuric acid reagent, the aniline-impregnated silica, and a polyethylene resin binder in a weight ratio of 40:10:20:30 to obtain a mixed activated carbon. The physical properties of each parameter of the deodorizing filter material of the present invention are shown in Table 1 below.

[0068] Example 6

[0069] The preparation processes of the support layer, the antibacterial melt-blown non-woven fabric layer, and the filter material are the same as those in Example 1, and the specific formulations and physical properties are shown in Table 1.

[0070] Preparation of deodorizing layer: First, activate coconut shell activated carbon with an average pore diameter of 15 nm by steam. Then, dissolve 30 g of aluminum hydroxide reagent and 30 g of phosphoric acid reagent in water until the solution is transparent. Spray it on 100 g of activated carbon, stir evenly for 30 min, and then dry to obtain activated carbon containing aluminum hydroxide reagent and activated carbon containing phosphoric acid reagent. Then, dissolve 10 g of methylene triamine reagent in water until the solution is transparent. Spray it on 100 g of silica particles with an average pore diameter of 1.2 ml / g, stir evenly for 30 min, and then dry to obtain methylene triamine-impregnated silica. Then, mix the activated carbon containing aluminum hydroxide reagent, the activated carbon containing phosphoric acid reagent, the methylene triamine-impregnated silica, and a polyethylene resin binder in a weight ratio of 40:10:20:30 to obtain a mixed activated carbon. The physical properties of each parameter of the deodorizing filter material of the present invention are shown in Table 1 below.

[0071] Example 7

[0072] The preparation processes of the support layer, the antibacterial melt-blown non-woven fabric layer, and the filter material are the same as those in Example 1, and the specific formulations and physical properties are shown in Table 1.

[0073] Preparation of deodorizing layer: First, coconut shell activated carbon with an average pore diameter of 20 nm is activated by steam. Then, 30 g of sodium carbonate reagent and 30 g of hydrochloric acid reagent are dissolved in water until the solution is transparent, and the solution is sprayed on 100 g of activated carbon and stirred evenly for 30 min, followed by drying to obtain activated carbon containing sodium carbonate reagent and activated carbon containing hydrochloric acid reagent. Then, 10 g of acrylamide reagent is dissolved in water until the solution is transparent, and the solution is sprayed on 100 g of silica particles with an average pore diameter of 2.0 ml / g and stirred evenly for 30 min, followed by drying to obtain acrylamide-impregnated silica. Then, the activated carbon containing sodium carbonate reagent, the activated carbon containing hydrochloric acid reagent, acrylamide-impregnated silica, and a polyethylene resin adhesive are mixed in a weight ratio of 10:20:40:30 to obtain a mixed activated carbon. The physical properties of each parameter of the deodorizing filter material of the present invention are shown in Table 1 below.

[0074] Comparative Example 1

[0075] (1) Preparation of the support layer: Ordinary polyester fiber, core-sheath type polyester fiber, antibacterial polyester fiber, and flame-retardant polyester fiber are mixed and carded into a web, cooled and consolidated to obtain a thermally bonded non-woven fabric.

[0076] (2) Preparation of the deodorizing layer: First, coconut shell activated carbon with an average pore diameter of 30 nm is activated by steam. Then, 30 g of sodium carbonate reagent and 30 g of hydrochloric acid reagent are dissolved in water until the solution is transparent, and the solution is sprayed on 100 g of activated carbon and stirred evenly for 30 min, followed by drying to obtain activated carbon containing sodium carbonate reagent and activated carbon containing hydrochloric acid reagent. Then, 10 g of acrylamide reagent is dissolved in water until the solution is transparent, and the solution is sprayed on 100 g of silica particles with an average pore diameter of 1.2 ml / g and stirred evenly for 30 min, followed by drying to obtain acrylamide-impregnated silica. Then, the activated carbon containing sodium carbonate reagent, the activated carbon containing hydrochloric acid reagent, acrylamide-impregnated silica, and a polyethylene resin adhesive are mixed in a weight ratio of 50:15:15:20 to obtain a mixed activated carbon.

[0077] (3) Preparation of the antibacterial melt-blown non-woven fabric layer: Using the melt-blown process, polypropylene resin chips containing zinc oxide are put into the hopper. The chips are extruded after being melted at high temperature by a screw extruder, and then drawn into short fibers by hot air, and a web is formed to obtain an antibacterial melt-blown non-woven fabric.

[0078] (4) Preparation of the filter material: First, a layer of 7 g / m 2 of polyethylene rubber powder is evenly sprinkled on the thermally bonded non-woven fabric, and then the mixed activated carbon is evenly sprinkled on the thermally bonded non-woven fabric at 150 g / m 2 . After heating in an oven at 120 °C for 20 s, the antibacterial melt-blown non-woven fabric is covered on the mixed activated carbon, and finally the filter material is obtained. The parameters and physical properties of the filter material are shown in Table 1 below.

[0079] Comparative Example 2

[0080] The preparation processes of the support layer, antibacterial meltblown non-woven fabric layer, and filter medium are the same as those in Comparative Example 1, and the specific formulations and physical properties are shown in Table 1.

[0081] Preparation of the deodorizing layer: First, coconut shell activated carbon with an average pore diameter of 30 nm is activated by steam. Then, 30 g of sodium carbonate reagent and 30 g of hydrochloric acid reagent are dissolved in water until the solution is transparent, sprayed onto 100 g of activated carbon, stirred evenly for 30 min, and then dried to obtain activated carbon containing sodium carbonate reagent and activated carbon containing hydrochloric acid reagent. Then, 10 g of acrylamide reagent is dissolved in water until the solution is transparent, sprayed onto 100 g of silica particles with an average pore diameter of 1.2 ml / g, stirred evenly for 30 min, and then dried to obtain acrylamide-impregnated silica. Then, the activated carbon containing sodium carbonate reagent, the activated carbon containing hydrochloric acid reagent, acrylamide-impregnated silica, and a polyethylene resin binder are mixed in a weight ratio of 10:30:40:20 to obtain a mixed activated carbon. The physical properties of each parameter of this filter medium are shown in Table 2 below.

[0082] Comparative Example 3

[0083] The preparation processes of the support layer, antibacterial meltblown non-woven fabric layer, and filter medium are the same as those in Comparative Example 1, and the specific formulations and physical properties are shown in Table 1.

[0084] Preparation of the deodorizing layer: First, coconut shell activated carbon with an average pore diameter of 30 nm is activated by steam. Then, 30 g of sodium carbonate reagent and 30 g of hydrochloric acid reagent are dissolved in water until the solution is transparent, sprayed onto 100 g of activated carbon, stirred evenly for 30 min, and then dried to obtain activated carbon containing sodium carbonate reagent and activated carbon containing hydrochloric acid reagent. Then, 10 g of acrylamide reagent is dissolved in water until the solution is transparent, sprayed onto 100 g of silica particles with an average pore diameter of 1.2 ml / g, stirred evenly for 30 min, and then dried to obtain acrylamide-impregnated silica. Then, the activated carbon containing sodium carbonate reagent, the activated carbon containing hydrochloric acid reagent, acrylamide-impregnated silica, and a polyethylene resin binder are mixed in a weight ratio of 15:15:50:20 to obtain a mixed activated carbon. The physical properties of each parameter of this filter medium are shown in Table 2 below.

[0085] Table 1

[0086]

[0087] Table 2

[0088]

Claims

1. A deodorizing filter medium, characterized in that: the filter medium comprises a support layer, a deodorizing layer, and an antibacterial melt-blown nonwoven fabric layer, and the deodorizing layer contains 5-40% by weight of activated carbon containing metal cations, 5-20% by weight of activated carbon containing acid radical ions, and 5-40% by weight of an amine compound adhering carrier.

2. The deodorizing filter medium according to claim 1, characterized in that: the metal cations are at least one of sodium ions, potassium ions, aluminum ions, and copper ions.

3. The deodorizing filter medium according to claim 1, characterized in that: the acid radical ions are at least one of carbonate, chlorate, phosphate, and nitrate.

4. The deodorizing filter medium according to claim 1, characterized in that: the amine compounds are at least one of aniline, methylene triamine, aminoguanidine, and acrylamide.

5. The deodorizing filter medium according to claim 1, characterized in that: The grammage of the deodorizing layer is 150 to 500 g / m 2 .

6. The deodorizing filter medium according to claim 1, characterized in that: the average pore diameter of the activated carbon is 2-50 nm.

7. The deodorizing filter medium according to claim 1, characterized in that: the pore volume of the carrier is 1 ml / g or more.

8. The deodorizing filter medium according to claim 1, characterized in that: the antibacterial melt-blown nonwoven fabric layer contains antibacterial electret masterbatch.

9. The deodorizing filter medium according to claim 8, characterized in that: the antibacterial electret masterbatch contains metal or metal oxide.

10. The deodorizing filter medium according to claim 9, characterized in that: the metal oxide is an oxide formed by one or more selected from copper, cobalt, aluminum, nickel, zinc, palladium, molybdenum, and tungsten.

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