Filtering material and application thereof

Abstract

The invention discloses a filter material, the filter material comprises a support layer, a deodorization layer and a melt-blown layer, the deodorization layer contains 50-80 wt% of active carbon particles and 5-15 wt% of an amino-containing silicon dioxide carrier, and the active carbon particles contain 5-25 wt% of acid radical groups. The filter material disclosed by the invention is high in removal rate of gases such as ammonia gas, methyl mercaptan, hydrogen sulfide and trimethylamine, and can be applied to removal of peculiar smell of pets.

Description

Technical Field

[0001] The present invention relates to a filter material and its use. Background Art

[0002] In recent years, pets have become an indispensable member of some families. While they bring joy to people, they also bring negative impacts. Since the protein and fat content in pet food is relatively high and their absorption rate is low, the odor of pet excrement is very strong. Pet excrement contains gases such as ammonia, hydrogen sulfide, methane, skatole, and amines. Generally, the existing filters on the market use H12 and H13 precision filter meshes, which are composed of ordinary activated carbon and two layers of non-woven fabric. They can mainly remove pollution sources such as formaldehyde, toluene, and VOC, but it is difficult to remove the gases in pet excrement.

[0003] For example, Chinese Patent Publication No. CN101332385A discloses an air filter material with activated carbon particles clamped between two layers of non-woven fabric. Although this filter material can intercept solid particles such as dust and remove some gases in the air by using the adsorption function of activated carbon, since the activated carbon particles are ordinary activated carbon, they cannot remove gases such as ammonia, methanethiol, hydrogen sulfide, and trimethylamine contained in pet odor. Summary of the Invention

[0004] The object of the present invention is to provide a filter material with a high removal rate of gases such as ammonia, methanethiol, hydrogen sulfide, and trimethylamine.

[0005] The technical solution of the present invention is as follows: The filter material of the present invention includes a support layer, a deodorizing layer, and a melt-blown layer. The deodorizing layer contains 50-80% by weight of activated carbon particles and 5-15% by weight of an amine group-containing silica carrier. The activated carbon particles contain 5-25% by weight of acid radical groups.

[0006] Advantages of the present invention: The filter material of the present invention not only has the characteristics of good low resistance and high capture efficiency, but also has a high removal rate of gases such as ammonia, methanethiol, hydrogen sulfide, and trimethylamine. This filter material can be applied to remove pet odor. Detailed Embodiments

[0007] The filtering material for removing pet odors of the present invention includes a support layer, a deodorizing layer, and a meltblown layer. The deodorizing layer contains 50-80% by weight of activated carbon particles and 5-15% by weight of an amine group-containing silica carrier. The activated carbon particles contain 5-25% by weight of acid radical groups. Since the surface of the activated carbon has abundant slender pore diameters, on the one hand, physical adsorption is achieved in the pores by the force between molecules, and on the other hand, by adding a reagent containing acid radical groups inside the small pores of the activated carbon, chemical adsorption is achieved. If unfixed activated carbon is used in the deodorizing layer and relies solely on physical adsorption of the activated carbon, after long-term use, the captured gas molecules will disperse outward, resulting in secondary odor emission and failing to achieve the purpose of removing odors. Therefore, the deodorizing layer of the present invention contains 50-80% by weight of activated carbon particles, and the activated carbon particles contain 5-25% by weight of acid radical groups. Since the activated carbon particles are acid-activated, a highly porous structure is formed on their surface, and they have abundant functional groups such as hydroxyl groups and carbon oxides, which can react with alkaline gases in the air to neutralize, having a high adsorption capacity and adsorption rate. If the content is less than 5% by weight, there are very few acid radical groups for neutralizing alkaline gases, and the adsorption of alkaline gases such as ammonia and trimethylamine in pet odors by the material changes from a chemical reaction to a physical adsorption. Not only is the adsorption rate slow, but it also causes the re-diffusion of odor gases, thereby reducing the service life of the filtering material; if it is greater than 25% by weight, there are too many acid radical groups in the activated carbon particles, and their hardness is low, and they are damaged due to pressure during the processing of the filter material, resulting in a reduction in the adsorption performance of the filtering material.

[0008] As a carrier, silica has the characteristics of small particle size, large specific surface area, and many pores. Since silica contains silanol groups, a silanol group is a group in which a silicon atom is bonded to a hydrogen atom and an oxygen atom. The silanol groups form an active hydroxyl layer on the surface of silica, making the surface of silica have good hydrophilicity and solubility. In addition, this silica is aminated silica. Since an affinity reaction occurs between amine molecules and aldehyde molecules, which is an irreversible chemical reaction, it can effectively remove aldehyde odors in the air and prevent gas re-diffusion. For example, the carbonyl group on a formaldehyde molecule reacts with the hydrogen atom on an amine molecule to generate harmless formamide and water. Therefore, the filtering material of the present invention contains 5-15% by weight of an amine group-containing silica carrier. If it is less than 5% by weight, the number of carriers dispersed throughout the filter material is small, the reaction rate of adsorbing odor gases is slow, the adsorption amount is small, and the adsorption capacity for methanethiol gas in pet odors is low; if it is greater than 15% by weight, the water absorption performance of the material will increase, resulting in the odor molecules adsorbed in the micropores being emitted with the moisture, losing the effect of removing indoor pet odors.

[0009] The average particle size of the above-mentioned activated carbon particles is preferably 150 to 650 μm. If the average particle size is too large, since the activated carbon particles are hard, the melt-blown layer may be damaged when pressed by the pressure roller, and when the filter material is folded into a filter element, the activated carbon has a tendency to burst out, thus reducing the particulate matter capture efficiency; if it is too small, the activated carbon particles are likely to fall from the gaps in the support layer, with a tendency to cause dust pollution. In order to better ensure the integrity of the cloth surface of each layer in the filter material and the fullness of the activated carbon particles, the average particle size of the activated carbon particles is more preferably 180 to 600 μm.

[0010] The grammage of the above-mentioned deodorizing layer is preferably 100 to 300 g / m 2 . The deodorizing layer is mainly used to adsorb odor gases. The grammage of the deodorizing layer is preferably 100 g / m 2 or more. This can ensure sufficient air contact area, and for gases such as ammonia, methanethiol, hydrogen sulfide, and trimethylamine in pet odors, a deodorizing effect of more than 80% can be achieved; the grammage of the deodorizing layer is preferably 300 g / m 2 or less, which can ensure that the material has an adsorption effect of more than 80% on pet odors, and can maintain a good shape during the folding process without breakage and carbon exposure.

[0011] The above-mentioned acid radical groups are preferably carbonate, acetate, oxalate or phosphate. The activated carbon particles with acid radical groups refer to ordinary activated carbon preferably activated by carbonic acid, acetic acid, oxalic acid or phosphoric acid to form activated carbon particles with a porous structure containing acid radical groups. Since phosphoric acid has good oxidizing properties, it can further oxidize the activated carbon particles, erode the carbon body to form pores, and thus form activated carbon with a rich and porous specific surface area. The surface of this activated carbon is mainly composed of acid groups, which can well adsorb alkaline gases such as ammonia and trimethylamine in pet odors, and no harmful gases will be generated during the treatment of the activated carbon. Therefore, the acid radical group is more preferably phosphate.

[0012] In order to ensure effective odor removal, the pH value of the above-mentioned activated carbon particles is preferably 2.5 or less. Under the action of acidic surface groups, the activated carbon particles are in an acidic state, and can undergo a neutralization reaction with alkaline gas molecules in the air, thus effectively removing the odor of alkaline gases such as ammonia and trimethylamine in the air.

[0013] The specific surface area of the above-mentioned activated carbon particles is preferably 1000 to 2000 m 2 / g. The specific surface area is one of the indicators used to measure the adsorption performance of activated carbon. The specific surface area of activated carbon includes the internal surface area and the external surface area. In fact, the adsorption performance of activated carbon mainly comes from its huge internal surface area. By making it preferably 1000 m 2 / g or more, more preferably 1200 m 2Above / g, activated carbon with effective area can be obtained, and the adsorption capacity for odor is improved. By making it preferably 2000 m 2 / g or less, more preferably 1500 m 2 / g or less, while maintaining a certain strength of the activated carbon, impurities and pollutants other than the target gas in the surrounding environment can be avoided from being adsorbed, thereby increasing the reliability of the material and ensuring its service life.

[0014] The specific surface area of the above-mentioned silica carrier is preferably 400 - 600 m 2 / g. Odor gas is captured through the porous structure of silica. Although the larger the specific surface area of the silica carrier, the better the adsorption capacity, the larger the specific surface area, the more pores on the surface of the carrier. During the process of fitting the filter material, it is prone to be damaged by external force extrusion, resulting in a decrease in adsorption capacity. In order to ensure sufficient contact area with air, actual reaction rate with the removed gas, and the effect of removing odor, the specific surface area of the silica carrier is preferably 400 m 2 / g or more. In order to ensure that the carrier can effectively remove odor and has a certain hardness, the specific surface area is preferably 600 m 2 / g or less.

[0015] The average pore diameter of the above-mentioned silica is preferably 55 - 65 nm. The silica surface has a relatively high pore volume, which can enable gas to diffuse into the pores and have good contact with the gas. In addition, a relatively high pore volume can accommodate a large amount of medicament.

[0016] The above-mentioned support layer is preferably composed of a thermal bonding non-woven fabric with a gram weight between 30 - 100 g / m 2 The raw material for forming the thermal bonding non-woven fabric is preferably PET, PP or PVA fiber, more preferably PET fiber. The thermal bonding non-woven fabric formed by PET fiber has characteristics such as high temperature resistance and high strength. During the processing process, it can prevent the leakage of activated carbon particles. In order to ensure that the filter material has better strength and is not easily damaged, the gram weight of the support layer is more preferably 60 - 80 g / m 2 .

[0017] The above-mentioned meltblown layer is preferably composed of a polypropylene charged meltblown non-woven fabric with an average fiber diameter between 3.0 - 6.0 μm. The fineness of the fiber is represented by the diameter and cross-sectional area of the fiber, or determined by the mass and length of the fiber. The finer the fiber diameter, the larger the specific surface area. The more fibers there are per unit area of the meltblown cloth, the smaller and more complex the gaps between the fibers, and the narrower the pore distribution. Therefore, more particles are captured, thereby improving the filtration efficiency of the filter material.

[0018] The above-mentioned charged meltblown non-woven fabric is preferably a hydroelectret polypropylene meltblown non-woven fabric. The meltblown fabric treated with hydroelectret has a high trapping efficiency. In addition, in order to prevent it from being punctured by activated carbon particles, the grammage of the polypropylene charged meltblown fabric of the present invention is preferably 20-80 g / m 2 .

[0019] The preparation method of the filter material of the present invention includes the following steps:

[0020] (1) Preparation of the support layer: After the PET fibers are carded into a web, they are then subjected to thermal bonding processing to form a thermally bonded non-woven fabric with a grammage of 60-80 g / m 2 .

[0021] (2) Preparation of the meltblown layer: The polypropylene masterbatch containing a nucleating agent is melted at a high temperature and then ejected from a die with fine holes. After being stretched and thinned by hot air, it falls on the surface of the collecting net to form a fiber web. Then, the obtained fiber web is subjected to electret processing to obtain a charged meltblown fabric;

[0022] (3) Preparation of the deodorizing layer: a. Activated carbon added with an acidic agent and ordinary activated carbon are mixed at a weight ratio of 25-60:75-40 to obtain activated carbon particles; b. An aqueous solution of a reagent containing 5-10% by weight of amine groups is sprayed on a silica porous carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and the rubber powder are mixed at a weight ratio of 50-80:5-15:15-35 to obtain a deodorizing adsorbent material;

[0023] (4) Preparation of the filter material: The deodorizing adsorbent material prepared in step (3) and an adhesive are evenly spread on the surface of the support layer, and then passed through a heating zone at 310-370 °C, and pressed by a pressure roller to be bonded to the meltblown layer, and finally the filter material of the present invention is obtained.

[0024] 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.

[0025]

Grammage of the filter material

[0026] In an environment with a normal temperature of 26 °C and a humidity set at 60% RH, according to the JIS L1913 test method, along the width direction of the filter material, 3 samples with a size of 30 cm × 50 cm are taken, weighed respectively, and the weight per unit area is calculated. Then, the average value of the weights of the 3 samples is taken as the grammage of the filter material. The calculation formula for the weight per unit area of each sample is as follows: The calculation formula for the average weight per unit area is as follows: Where:

[0027] g n : The weight of each sample (unit: g);

[0028] G n : The grammage of each sample (weight per unit area) (unit: g / m 2 );

[0029] The average grammage of 3 samples (weight per unit area) (unit: g / m 2 ).

[0030]

Grammage of the support layer

[0031] Number the above 3 filter materials with the size of 30 cm × 50 cm, tear them apart to separate the support layer, deodorizing layer and meltblown layer respectively, put the deodorizing layer particles with different numbers into 3 clean beakers that have been weighed for grammage, and peel off the deodorizing layer particles adhered to the inner surfaces of the support layer and meltblown layer and put them into the corresponding numbered beakers until the peeling is sufficient.

[0032] According to the JIS L1913 test method, weigh the 3 peeled support layer samples with the size of 30 cm × 50 cm, calculate their weight per unit area, and then calculate the average value of the 3 weights as the grammage result of the support layer. The calculation formula for the weight per unit area of each sample is as follows: The calculation formula for the average weight per unit area is as follows: Where:

[0033] g n : The weight of each sample (unit: g);

[0034] G n : The grammage of each sample (weight per unit area) (unit: g / m 2 );

[0035] The average grammage of 3 samples (weight per unit area) (unit: g / m 2 ).

[0036] The grammage of the meltblown layer can be calculated by the same method as above.

[0037]

Grammage of the deodorizing layer

[0038] Weigh the above 3 beakers containing deodorizing layer particles respectively, record the weights, and take their average value to obtain the grammage of the deodorizing layer. That is:

[0039]

Weight of the amine-based agent

[0040] The amino groups in the amino group-containing silica carrier exist as amino compounds, and the amino compounds in the material are determined by ultraviolet-visible spectrophotometry.

[0041] Dry the deodorizing layer mixture obtained by peeling the filter material with a size of 30 cm × 50 cm, accurately weigh 1.00 g of the sample and place it in a triangular flask, add 20 mL of PBST buffer solution to the flask, shake to fully wet the sample, then perform ultrasonic extraction for 0.5 h, and filter; dilute the filtrate to 25 mL with PBST buffer solution; accurately pipette 1 mL of the extract, 1 mL of 5% sodium borate solution and 0.2 mL of 0.5% TNBS solution, then place them in a stoppered test tube and let it stand, and finally measure the absorbance at the maximum absorption wavelength.

[0042] The chemiluminescence intensity at time t is proportional to the analyte concentration c at that time, that is, the chemiluminescence peak intensity is linearly related to the analyte concentration c, that is: Calculate the content of the amino group-containing agent in 1.00 g of the deodorizing layer from the analyte concentration, that is: g (胺基化合物) = c × 25 mL. Perform 3 tests and then take the average value.

[0043]

Weight of silica carrier

[0044] Dry and weigh G the deodorizing layer mixture obtained by peeling the filter material with a size of 30 cm × 50 cm (脱臭层) , place it in a 10% HF (hydrofluoric acid) solution, a 3 - 4-fold stoichiometric ratio is fine, perform magnetic stirring for 12 h, the HF solution can dissolve SiO 2 , filter with a small pore size filter paper to obtain a mixture of activated carbon and trace rubber powder, rinse and wash, and finally dry and weigh, denoted as G 1 . Obtain the weight of the silica carrier through the following calculation formula:

[0045] G (胺基化合物) = g (胺基化合物) × G (脱臭层) ,

[0046] G (二氧化硅载体) = G (脱臭层) - G 1 - G (胺基化合物) .

[0047] Perform 3 tests and then take the average value.

[0048]

Content of amino group-containing silica carrier

[0049] According to the weight G of the amino compound obtained by the above method (胺基化合物) and the weight G of silica (二氧化硅载体)The content of the silica carrier with an amino group is obtained through the following calculation formula:

[0050]

[0051]

Content of activated carbon particles

[0052] The deodorizing layer mixture obtained by peeling off the filter material with a size of 30 cm × 50 cm is dried and weighed as G (脱臭层) , and the calculation formula for the weight of the activated carbon particles is as follows:

[0053] G (活性炭) = G (脱臭层) - G (二氧化硅载体) - G (胺基化合物) ,

[0054] The calculation formula for the content of the activated carbon particles is as follows:

[0055]

Content of acid radical groups

[0056] The deodorizing layer mixture obtained by peeling off the filter material with a size of 30 cm × 50 cm is dried and weighed as G (脱臭层) , and the weight obtained according to the above method is G (活性炭) . The activated carbon particle sample is added to distilled water, and the pH value of the water is adjusted to neutral. Then it is put into an AgNO 3 solution for reaction to fully react to form a yellow Ag 3 PO 4 precipitate. Then nitric acid solution is added to dissolve the yellow precipitate, and then it is filtered with a small-aperture filter paper to obtain pure activated carbon, rinsed, washed, and finally dried and weighed, denoted as G (纯活性炭) . The content of the acid radical groups is:

[0057] G (酸根基团的重量) = G (活性炭) - G (纯活性炭) ,

[0058] Perform 3 tests and then take the average value.

[0059]

pH value

[0060] Weigh 5 g of the powdered sample of the activated carbon prepared by the above method and add it to 10 ml of distilled water. Stir gently and let it stand for 10 min. Measure the pH of the liquid with a TESTER pH meter of Lacom Company. Perform 3 tests and then take the average value. (活性炭)

[0061]

Average particle size of activated carbon particles

[0062] The test is carried out according to the sieve method for the determination of particle size in inorganic chemical products (GB / T 21524-2008).

[0063]

Specific surface area of activated carbon particles

[0064] The activated carbon particles with a weight of G prepared by the above method are tested. (活性炭)

[0065] The test is carried out according to the national standard using the low-temperature nitrogen adsorption BET multi-point method (GB / T 19587-2004). In the range of 5-30% nitrogen partial pressure, the adsorption amount of nitrogen by the adsorbent (powder to be tested) is measured at different nitrogen partial pressure points, the adsorption isotherm is made, and the monolayer saturation adsorption amount corresponding to the surface of the adsorbent being covered with a monolayer of nitrogen molecules is obtained through the BET formula, and then the specific surface area of the activated carbon particles can be calculated. The calculation formula is as follows:

[0066]

[0067] V_m: The volume of activated carbon per unit weight (cm 3 / g);

[0068] N_m: The adsorption capacity of gas molecules in activated carbon (cm 3 / g);

[0069] 10 5 : Unit conversion coefficient.

[0070] The BET specific surface area, N_m and V_m are calculated by a Pettier-Reid analyzer.

[0071]

Specific surface area of silica support

[0072] The test is carried out according to the national standard using the low-temperature nitrogen adsorption BET multi-point method (GB / T 19587-2004). In the range of 5-30% nitrogen partial pressure, the adsorption amount of nitrogen by the adsorbent (powder to be tested) is measured at different nitrogen partial pressure points, the adsorption isotherm is made, and the monolayer saturation adsorption amount corresponding to the surface of the adsorbent being covered with a monolayer of nitrogen molecules is obtained through the BET formula, and then the specific surface area of the silica support can be calculated. The calculation formula is as follows:

[0073]

[0074] V_m: The volume of silica support per unit weight (cm 3 / g);

[0075] N_m: The adsorption capacity of gas molecules in silica support (cm 3 / g);​

[0076] 10 5 : Unit conversion factor.

[0077] The BET specific surface area, N_m, and V_m are calculated by a Pore & Particle Sizer.

[0078]

Average diameter of fibers

[0079] Take 10 square samples with dimensions of approximately 3 mm × 3 mm along the width direction of the filter medium. Place them on the stage of a scanning electron microscope respectively. After randomly selecting any one place of each sample and magnifying it by 1000 - 1500 times, measure the fiber diameters of about 30 fibers. There are a total of 300 fiber diameter values for the 10 samples, and then calculate their average value. The calculation formula is as follows:

[0080] d n : Fiber diameter of each fiber (unit: μm);

[0081] Average fiber diameter (unit: μm);

[0082] n: n = 1, 2, 3, 4, 5...

[0083]

Pressure loss

[0084] Take 5 circular samples with an area of 471 cm 2 along the width direction of the filter medium. Set up the evaluation specimen in the evaluation machine according to the JIS B9908 (2011) test method, and let air flow through the filter material with an area of 301 cm 2 at a wind speed of 3.2 m / min, and record the pressure loss. The pressure loss of the material is obtained from the following calculation formula:

[0085] X n : Pressure loss results measured for 5 samples at one time (unit: Pa);

[0086] Average value of the pressure loss of 5 samples (unit: Pa);

[0087] n: n = 1, 2, 3, 4, 5.

[0088]

Collection efficiency

[0089] Take 5 circular samples with an area of 471 cm 2 along the width direction of the filter medium. Set up the evaluation specimen in the evaluation machine according to the JIS B9908 (2011) test method, and let air flow through the filter material with an area of 301 cm 2The filter material is then fed with Pst particles from the upstream side, and a particle counter is used to measure the number of particles before and after the evaluation of the filter material. The capture efficiency of each sample is obtained from the following calculation formula, and then the average value of the filtration efficiency of 5 materials is calculated. The calculation formula for the capture efficiency of each filter material sample is as follows: γ n = (1 - (C0 / C1)) × 100. The calculation formula for the average value of the capture efficiency of the filter material is as follows:

[0090] C0: The number of particles with a particle size of 0.3 - 0.5 μm after passing through the evaluation filter;

[0091] C1: The number of particles with a particle size of 0.3 - 0.5 μm before passing through the evaluation filter;

[0092] γ n : The capture efficiency result measured once for each sample (unit: %);

[0093] The average value of the capture efficiency of 5 samples (unit: %);

[0094] n: n = 1, 2, 3, 4, 5.

[0095]

Odor removal efficiency

[0096] The test is carried out with reference to "GB / T 18801-2015 Air Purifier". This test method is applicable to gases such as ammonia, methyl mercaptan, hydrogen sulfide, trimethylamine, and TVOC.

[0097] Example 1

[0098] (1) Preparation of the support layer: A thermally bonded non-woven fabric with a basis weight of 60 g / m made of PET fibers is used as the support layer; 2 of the support layer;

[0099] (2) Preparation of the melt-blown layer: A charged melt-blown non-woven fabric with a basis weight of 25 g / m made of polypropylene fibers with an average fiber diameter of 3.6 μm is used as the melt-blown layer; 2 of the melt-blown layer;

[0100] (3) Preparation of the deodorizing layer: a. Activated carbon added with phosphoric acid agent and ordinary activated carbon are mixed at a weight ratio of 30:70 to obtain activated carbon particles; b. An aqueous solution of adipic dihydrazide agent containing 8% by weight is sprayed on the silica porous carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and the rubber powder are mixed at a weight ratio of 50:15:35 to obtain a deodorizing adsorbent material as the deodorizing layer;

[0101] (4) Preparation of the filter material: The deodorant adsorbent material obtained in step (3) and the adhesive are evenly spread on the surface of the support layer, and then passed through a heating area at 250 °C and adhered to the meltblown layer through a pressure roller to finally obtain the filter material of the present invention. The physical properties of each parameter of the filter material of the present invention are shown in Table 1 below.

[0102] Example 2

[0103] The preparation processes of the support layer, the meltblown 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.

[0104] Preparation of the deodorant layer: a. Activated carbon added with a carbonic acid agent and ordinary activated carbon are mixed at a weight ratio of 30:70 to obtain activated carbon particles; b. An aqueous solution of adipic dihydrazide agent containing 8% by weight is sprayed on the silica porous carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and the rubber powder are mixed at a weight ratio of 55:10:35 to obtain a deodorant adsorbent material as the deodorant layer. The physical properties of each parameter of the filter material of the present invention are shown in Table 1 below.

[0105] Example 3

[0106] The preparation processes of the support layer, the meltblown 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.

[0107] Preparation of the deodorant layer: a. Activated carbon added with a phosphoric acid agent and ordinary activated carbon are mixed at a weight ratio of 29:71 to obtain activated carbon particles; b. An aqueous solution of adipic dihydrazide agent containing 8% by weight is sprayed on the silica porous carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and the rubber powder are mixed at a weight ratio of 60:15:25 to obtain a deodorant adsorbent material as the deodorant layer. The physical properties of each parameter of the filter material of the present invention are shown in Table 1 below.

[0108] Example 4

[0109] The preparation processes of the support layer, the meltblown 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.

[0110] Preparation of the deodorant layer: a. Activated carbon added with a phosphoric acid agent and ordinary activated carbon are mixed at a weight ratio of 48:52 to obtain activated carbon particles; b. An aqueous solution of adipic dihydrazide agent containing 8% by weight is sprayed on the silica porous carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and the rubber powder are mixed at a weight ratio of 67:8:25 to obtain a deodorant adsorbent material as the deodorant layer. The physical properties of each parameter of the filter material of the present invention are shown in Table 1 below.

[0111] Example 5

[0112] The preparation processes of the support layer, the meltblown 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.

[0113] Preparation of the deodorizing layer: a. Mix activated carbon added with oxalic acid agent and ordinary activated carbon at a weight ratio of 40:60 to obtain activated carbon particles; b. Spray an aqueous solution containing 8% by weight of adipic dihydrazide agent on the porous silica carrier to obtain an amine-containing silica carrier composition; c. Mix the activated carbon particles in step a, the composition in step b, and the rubber powder at a weight ratio of 55:10:35 to obtain a deodorizing and adsorbing material as the deodorizing layer. The physical properties of each parameter of the filter material of the present invention are shown in Table 1 below.

[0114] Example 6

[0115] The preparation processes of the support layer, the meltblown 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.

[0116] Preparation of the deodorizing layer: a. Mix activated carbon added with phosphoric acid agent and ordinary activated carbon at a weight ratio of 48:52 to obtain activated carbon particles; b. Spray an aqueous solution containing 8% by weight of adipic dihydrazide agent on the porous silica carrier to obtain an amine-containing silica carrier composition; c. Mix the activated carbon particles in step a, the composition in step b, and the rubber powder at a weight ratio of 70:10:20 to obtain a deodorizing and adsorbing material as the deodorizing layer. The physical properties of each parameter of the filter material of the present invention are shown in Table 1 below.

[0117] Example 7

[0118] The preparation processes of the support layer, the meltblown 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.

[0119] Preparation of the deodorizing layer: a. Mix activated carbon added with phosphoric acid agent and ordinary activated carbon at a weight ratio of 37:63 to obtain activated carbon particles; b. Spray an aqueous solution containing 8% by weight of adipic dihydrazide agent on the porous silica carrier to obtain an amine-containing silica carrier composition; c. Mix the activated carbon particles in step a, the composition in step b, and the rubber powder at a weight ratio of 66:9:25 to obtain a deodorizing and adsorbing material as the deodorizing layer. The physical properties of each parameter of the filter material of the present invention are shown in Table 1 below.

[0120] Example 8

[0121] The preparation processes of the support layer, the meltblown 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.

[0122] Preparation of deodorizing layer: a. Activated carbon particles are prepared by mixing activated carbon added with phosphoric acid agent and ordinary activated carbon at a weight ratio of 37:63; b. An aqueous solution of adipic dihydrazide agent containing 8% by weight is sprayed onto a porous silica carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and rubber powder are mixed at a weight ratio of 66:9:25 to obtain a deodorizing and adsorbing material as the deodorizing layer. The physical properties of each parameter of the filter material of the present invention are shown in Table 1 below.

[0123] The filter materials prepared in Examples 1-8 can be applied to remove pet odors.

[0124] Comparative Example 1

[0125] (1) Preparation of support layer: A thermally bonded non-woven fabric with a grammage of 60 g / m 2 made of PET fiber is used as the support layer;

[0126] (2) Preparation of meltblown layer: A charged meltblown non-woven fabric with a grammage of 25 g / m 2 made of polypropylene fibers with an average fiber diameter of 3.6 μm is used as the meltblown layer;

[0127] (3) Preparation of deodorizing layer: a. Activated carbon particles are prepared by mixing activated carbon added with phosphoric acid agent and ordinary activated carbon at a weight ratio of 30:70; b. An aqueous solution of adipic dihydrazide agent containing 8% by weight is sprayed onto a porous silica carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and rubber powder are mixed at a weight ratio of 20:15:65 to obtain a deodorizing and adsorbing material as the deodorizing layer;

[0128] (4) Preparation of filter material: The deodorizing and adsorbing material prepared in step (3) and a polyethylene adhesive are evenly spread on the surface of the support layer, and then passed through a heating zone at 250 °C and pressed by a roller to be bonded to the meltblown layer, finally obtaining the filter material. The physical properties of each parameter of this filter material are shown in Table 2 below.

[0129] Comparative Example 2

[0130] The preparation processes of the support layer, meltblown layer, and filter material are the same as those in Comparative Example 1, and the specific formulations and physical properties are shown in Table 1.

[0131] Preparation of deodorizing layer: a. Activated carbon added with phosphoric acid agent and ordinary activated carbon are mixed at a weight ratio of 5:95 to obtain activated carbon particles; b. An aqueous solution of adipic dihydrazide agent containing 8% by weight is sprayed onto a silica porous carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and rubber powder are mixed at a weight ratio of 50:15:35 to obtain a deodorizing and adsorbing material as the deodorizing layer. The physical properties of each parameter of this filter material are shown in Table 2 below.

[0132] Comparative Example 3

[0133] The preparation processes of the support layer, meltblown layer, and filter material are the same as those in Comparative Example 1, and the specific formulations and physical properties are shown in Table 1.

[0134] Preparation of deodorizing layer: a. Activated carbon added with phosphoric acid agent and ordinary activated carbon are mixed at a weight ratio of 30:70 to obtain activated carbon particles; b. An aqueous solution of adipic dihydrazide agent containing 8% by weight is sprayed onto a silica porous carrier to obtain an amine-containing silica carrier composition; c. The activated carbon particles in step a, the composition in step b, and rubber powder are mixed at a weight ratio of 50:2:48 to obtain a deodorizing and adsorbing material as the deodorizing layer.

[0135] The physical properties of each parameter of this filter material are shown in Table 2 below.

[0136] Table 1

[0137]

[0138] Table 2

[0139]

Claims

1. A filter material, characterized in that: the filter material comprises a support layer, a deodorizing layer, and a meltblown layer, the deodorizing layer contains 50-80% by weight of activated carbon particles and 5-15% by weight of an amine group-containing silica carrier, and the activated carbon particles contain 5-25% by weight of acid radical groups.

2. The filter material according to claim 1, characterized in that: the average particle size of the activated carbon particles is 150-650 μm.

3. The filter material according to claim 1, characterized in that: The grammage of the deodorizing layer is 100 to 300 g / m 2 .

4. The filter material according to claim 1, characterized in that: the acid radical groups are carbonate, acetate, oxalate or phosphate groups.

5. The filter material according to claim 1, characterized in that: the pH value of the activated carbon particles is below 2.

5.

6. The filter material according to claim 1, characterized in that: The specific surface area of the activated carbon particles is 1000 to 2000 m 2 / g.

7. The filter material according to claim 1, characterized in that: The specific surface area of the silica carrier is 400 to 600 m 2 / g.

8. The filter material according to claim 1, characterized in that: The support layer is composed of a thermally bonded non-woven fabric with a gram weight between 30 and 100 g / m 2 2 9. The filter material according to claim 1, characterized in that: the meltblown layer is composed of an electrified meltblown nonwoven fabric of polypropylene fibers with an average diameter between 3.0 and 6.0 μm.

10. Application of the filter material according to claim 1 in removing pet odors.

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