Composite filter material for gas mask and preparation method of composite filter material

Abstract

According to the composite filter material for the gas mask and the preparation method of the composite filter material, the composite filter material is mainly prepared from the cobalt-nickel oxide loaded zeolite molecular sieve material, the copper oxide loaded activated carbon material and the small-particle-size crushed sponge, the modified zeolite molecular sieve and the modified activated carbon material are evenly loaded on the crushed sponge, and the modified zeolite molecular sieve and the modified activated carbon material are uniformly loaded on the crushed sponge by controlling the loading capacity. The prepared composite filter material for the gas mask can have a good adsorption effect on solid smoke particles and carbon monoxide generated in a fire at the same time, an excellent protection effect can be achieved within 45 min, cobalt-nickel oxide and copper oxide are matched to form an excellent conversion performance on poisonous gas of carbon monoxide, and meanwhile, the composite filter material for the gas mask can be used as a fire protection material for the gas mask. Load modification can provide the zeolite molecular sieve and the activated carbon with good dispersion capacity on the sponge pieces, reduce agglomeration, and can be stably suspended in the sponge pieces, and through mutual cooperation of the zeolite molecular sieve and the activated carbon, an excellent isolation effect on solid smoke particles can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of anti-gas filter materials, and in particular relates to a composite filter material for a gas mask and a preparation method thereof. Background Art

[0002] Among various disasters, fire is one of the major disasters that most frequently and commonly threatens public safety and social development.

[0003] During a fire, building materials, furniture, clothes, cloth, plastic and other combustibles are not fully burned, producing a large amount of harmful gases and a mixture of solid particles to form a large amount of black smoke. Among them, smoke suspended in the air will be retained deep in the lungs when inhaled, causing inflammation, hindering the body's oxygen supply function, and seriously affecting the health of the lungs. What is more serious is that the concentration of carbon monoxide (CO) in the smoke produced by the combustion of commonly used building materials can reach 2.5%. CO is a highly toxic gas. Even if the carbon monoxide at a lower concentration is absorbed by the human body, it will combine with hemoglobin in the blood to form carboxyhemoglobin, which will cause hemoglobin to lose its oxygen-carrying ability and function, causing tissue suffocation in a short period of time, and in severe cases, death.

[0004] In the event of a fire, both rescuers and the rescued are very important to protect against solid smoke particles and carbon monoxide. Gas masks are a commonly used fire protection equipment, but many firefighting gas masks currently only prevent some activated carbon particles. Activated carbon cannot have a good adsorption effect on solid smoke particles and carbon monoxide, and cannot buy a longer time for fire protection.

[0005] Therefore, it is of great significance to develop a composite filter material for gas masks that can simultaneously have a good adsorption effect on solid smoke particles and carbon monoxide produced in a fire. Summary of the invention

[0006] The purpose of the present invention is to provide a composite filter material for gas masks and a preparation method thereof in view of the problem that the gas masks used in the prior art for fire cannot have a good adsorption effect on solid smoke particles and carbon monoxide. The gas filter material is mainly prepared from cobalt-nickel oxide-loaded zeolite molecular sieve material, iron oxide-loaded activated carbon material and sponge crushed. The composite filter material for gas masks can simultaneously have a good adsorption effect on solid smoke particles and carbon monoxide generated in the fire, and the preparation method is simple and easy to promote.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A composite filter material for a gas mask is prepared from the following raw materials, measured by weight: 5 to 15 parts of modified zeolite molecular sieve; 5 to 15 parts of modified activated carbon; and 15 to 30 parts of sponge crumbs; the particle size of the sponge crumbs is less than 1 mm, wherein the modified zeolite molecular sieve is a cobalt-nickel oxide-loaded zeolite molecular sieve material; and the modified activated carbon is a copper oxide-loaded activated carbon material.

[0009] The composite filter material for gas masks provided by the present invention is mainly prepared from cobalt-nickel oxide-loaded zeolite molecular sieve material, copper oxide-loaded activated carbon material and sponge crumbs with small particle size, wherein the modified zeolite molecular sieve and the modified activated carbon material are uniformly loaded on the sponge crumbs, and by controlling the loading amount, the prepared composite filter material for gas masks can simultaneously have a good adsorption effect on solid smoke dust particles and carbon monoxide generated in a fire, and can achieve an excellent protective effect within 45 minutes, wherein the coordination of cobalt-nickel oxide and copper oxide forms an excellent conversion performance for the toxic gas carbon monoxide, and at the same time, the loading modification can provide the zeolite molecular sieve and the activated carbon with good dispersibility on the sponge crumbs, reduce agglomeration, and can stably suspend in the sponge crumbs, and through the mutual coordination of the zeolite molecular sieve and the activated carbon, an excellent isolation effect can be achieved on the solid smoke dust particles, and the composite filter material has high practical value and is easy to promote.

[0010] Furthermore, the particle size of the sponge crumbs is 0.4-1 mm. Through a lot of research by the inventors, it is found that the particle size of the sponge crumbs plays a close role in the adsorption effect of the composite filter material. Preferably, the particle size of the sponge crumbs is 0.5 mm-1 mm.

[0011] Furthermore, the weight ratio of the modified zeolite molecular sieve to the modified activated carbon is 0.5 to 2:1. After extensive research by the inventors, it was found that the weight ratio of the modified zeolite molecular sieve to the modified activated carbon is a key factor affecting the adsorption effect of the composite filter material. A weight ratio that is too low or too high will cause the adsorption effect to deteriorate. Preferably, the weight ratio of the modified zeolite molecular sieve to the modified activated carbon is 1 to 2:1.

[0012] Furthermore, the modified zeolite molecular sieve is mainly prepared by the following method: adding the zeolite molecular sieve into a cobalt nitrate solution, stirring, and performing a first impregnation, wherein the first impregnation time is more than 4 hours;

[0013] The zeolite molecular sieve after the first impregnation is taken out and directly added into the nickel nitrate solution, stirred, and then impregnated for the second time, and the second impregnation time is more than 3 hours;

[0014] The zeolite molecular sieve impregnated for the second time is taken out, dried and calcined to prepare a modified zeolite molecular sieve;

[0015] Wherein, the diameter of the zeolite molecular sieve is 50-150 meshes; the concentration of the cobalt nitrate solution is 0.035-0.065 mol / L; and the concentration of the nickel nitrate is 0.3-0.8 mol / L.

[0016] The study found that the modified zeolite molecular sieve prepared by separate impregnation of cobalt nitrate solution and nickel nitrate solution has better adsorption effect.

[0017] Furthermore, the first immersion time is 4 to 8 hours; the second immersion time is 3 to 5 hours.

[0018] Furthermore, the calcination process is to increase the temperature to 550-700° C. at a heating rate of 5-10° C. and calcine for 6-12 hours.

[0019] Furthermore, the modified activated carbon is mainly prepared by the following method: adding activated carbon to a copper nitrate solution and reacting at a hydrothermal temperature of 150 to 180° C. for 6 to 12 hours, taking out the solution, and calcining the solution under nitrogen protection to obtain modified activated carbon.

[0020] Furthermore, the volume ratio of the activated carbon to the copper nitrate solution is 1:2-3; the concentration of the copper nitrate solution is 0.8-1.5 mol / L; the calcination temperature is 350-450° C., and the calcination time is 4-8 hours.

[0021] Another object of the present invention is to provide a method for preparing the above-mentioned gas mask composite filter material.

[0022] A method for preparing a composite filter material for a gas mask comprises the following steps: adding modified activated carbon into a polyethylene glycol 200 solvent and mixing, then adding sponge crumbs and a modified zeolite molecular sieve into the mixed solution, fully stirring, filtering, and drying to obtain the composite filter material for the gas mask.

[0023] The preparation method of the composite filter material for gas masks provided by the present invention comprises the following steps: adding modified activated carbon into polyethylene glycol 200 solvent and mixing, then adding sponge crumbs and modified zeolite molecular sieve into the mixed solution, fully stirring, filtering, and drying to obtain the composite filter material for gas masks. The preparation method of the composite filter material is simple, low in cost, and easy to promote.

[0024] Another object of the present invention is to provide a kind of needle-punched cotton for gas mask comprising the above-mentioned composite filter material.

[0025] A needle-punched cotton for a gas mask is prepared by the following steps:

[0026] Step 1, adding the above-mentioned gas mask composite filter material into anhydrous ethanol, and ultrasonically dispersing it to obtain a mixed solvent;

[0027] Step 2, soaking the original needle-punched cotton in the mixed solvent obtained in step 1, and drying it to obtain the needle-punched cotton for gas mask;

[0028] Wherein, in step 1, the weight ratio of the composite filter material for gas masks to anhydrous ethanol is 1:4-8; in the obtained needle-punched cotton for gas masks, the weight ratio of the composite filter material is 30%-50%.

[0029] The present invention provides a needle-punched cotton for a gas mask. The composite filter material provided by the present application is loaded on a needle-punched nonwoven fabric, which can achieve a better anti-gas filtering effect.

[0030] Furthermore, the original needle-punched cotton is prepared by the following method:

[0031] S1, putting the raw polyester fiber into a cotton mixing box for loosening and mixing, and then transporting it to a middle warehouse cotton mixing box to mix the cotton layer evenly by vibration;

[0032] S2, using a carding machine to comb the surface layer obtained in S1 into a single fiber state, and then form a mesh fiber layer, which is assembled into fiber strips and transported to a web laying machine;

[0033] S3, using a web laying machine to lay the fiber strips, and after the web is formed, it is transported to a needle punching machine;

[0034] S4, using a needle punching machine to pre-reinforce the fiber web to form a grey cloth, and then using a barb with barbed hooks on the edges of the cross section to reinforce the fiber web again, repeatedly puncturing, and then performing a hot rod forming process and a roll process to obtain the original needle-punched cotton.

[0035] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0036] 1. The composite filter material for gas masks provided by the present invention is mainly prepared from cobalt-nickel oxide-loaded zeolite molecular sieve material, copper oxide-loaded activated carbon material and small-particle sponge crumbs, wherein the modified zeolite molecular sieve and the modified activated carbon material are uniformly loaded on the sponge crumbs, and by controlling the loading amount, the prepared composite filter material for gas masks can simultaneously have a good adsorption effect on solid smoke particles and carbon monoxide generated in a fire, and can achieve an excellent protective effect within 45 minutes, wherein the combination of cobalt-nickel oxide and copper oxide forms an excellent conversion performance for carbon monoxide toxic gas, and at the same time, the loading modification can provide the zeolite molecular sieve and the activated carbon with good dispersibility on the sponge crumbs, reduce agglomeration, and can be stably suspended in the sponge crumbs, and through the mutual cooperation of the zeolite molecular sieve and the activated carbon, an excellent isolation effect can be achieved for the solid smoke particles, and the practical value is high and it is easy to promote.

[0037] 2. The preparation method of the composite filter material for gas masks provided by the present invention comprises the following steps: adding modified activated carbon to polyethylene glycol 200 solvent and mixing, then adding sponge crumbs and modified zeolite molecular sieves to the mixed solution, stirring fully, filtering, and drying to obtain the composite filter material for gas masks. The preparation method of the composite filter material is simple, low in cost, and easy to promote. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] Example 1

[0040] Preparation of modified zeolite molecular sieves

[0041] Prepare the raw materials: zeolite molecular sieve with a diameter of 100 mesh; cobalt nitrate solution with a concentration of 0.04 mol / L and nickel nitrate solution with a concentration of 0.5 mol / L.

[0042] Add the zeolite molecular sieve into the cobalt nitrate solution, stir, and perform the first impregnation. The first impregnation time is 6 hours.

[0043] The zeolite molecular sieve after the first impregnation was taken out and directly added into the nickel nitrate solution, stirred, and then impregnated for the second time. The second impregnation time was 4 hours;

[0044] The zeolite molecular sieve impregnated for the second time was taken out, dried, and then heated to 450° C. at a heating rate of 8° C. and calcined for 10 h to prepare a modified zeolite molecular sieve.

[0045] Preparation of modified activated carbon

[0046] Preparation: activated carbon and a copper nitrate solution with a concentration of 1.0 mol / L; wherein the volume ratio of the activated carbon to the copper nitrate solution is 1:2.5.

[0047] The activated carbon was added to the copper nitrate solution and reacted at a hydrothermal temperature of 145°C for 8 hours. The solution was taken out and calcined under nitrogen protection at a temperature of 400°C for 6 hours to obtain modified activated carbon.

[0048] Preparation of composite filter media

[0049] Preparation: 10 parts of modified zeolite molecular sieve, 10 parts of modified activated carbon, and 20 parts of sponge crumbs; the particle size of the sponge crumbs is 0.6 mm.

[0050] The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs and modified zeolite molecular sieve are added into the mixed solution, and the mixture is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0051] Example 2

[0052] Preparation of modified zeolite molecular sieves

[0053] Prepare the raw materials: zeolite molecular sieve with a diameter of 50 mesh; cobalt nitrate solution with a concentration of 0.035 mol / L and nickel nitrate solution with a concentration of 0.3 mol / L.

[0054] Add the zeolite molecular sieve into the cobalt nitrate solution, stir, and perform the first impregnation. The first impregnation time is 4 hours.

[0055] The zeolite molecular sieve after the first impregnation was taken out and directly added into the nickel nitrate solution, stirred, and then impregnated for the second time. The second impregnation time was 3 hours;

[0056] The zeolite molecular sieve impregnated for the second time was taken out, dried, and then heated to 550° C. at a heating rate of 5° C. and calcined for 6 hours to prepare a modified zeolite molecular sieve.

[0057] Preparation of modified activated carbon

[0058] Preparation: activated carbon and a copper nitrate solution with a concentration of 0.8 mol / L; wherein the volume ratio of the activated carbon to the copper nitrate solution is 1:2.

[0059] The activated carbon was added into the copper nitrate solution and reacted at a hydrothermal temperature of 150°C for 6 hours. The solution was taken out and calcined under nitrogen protection at a temperature of 350°C for 4 hours to obtain modified activated carbon.

[0060] Preparation of composite filter media

[0061] Preparation: 5 parts of modified zeolite molecular sieve; 10 parts of modified activated carbon; 15 parts of sponge crumbs; the particle size of the sponge crumbs is 0.4 mm.

[0062] The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs and modified zeolite molecular sieve are added into the mixed solution, and the mixture is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0063] Example 3

[0064] Preparation of modified zeolite molecular sieves

[0065] Prepare the raw materials: zeolite molecular sieve with a diameter of 150 mesh; cobalt nitrate solution with a concentration of 0.065 mol / L and nickel nitrate solution with a concentration of 0.8 mol / L.

[0066] Add the zeolite molecular sieve into the cobalt nitrate solution, stir, and perform the first impregnation. The first impregnation time is 8 hours.

[0067] The zeolite molecular sieve after the first impregnation was taken out and directly added into the nickel nitrate solution, stirred, and then impregnated for the second time. The second impregnation time was 5 hours;

[0068] The zeolite molecular sieve impregnated for the second time was taken out, dried, and then heated to 700° C. at a heating rate of 10° C. and calcined for 12 h to prepare a modified zeolite molecular sieve.

[0069] Preparation of modified activated carbon

[0070] Preparation: activated carbon and copper nitrate solution with a concentration of 1.5 mol / L; wherein the volume ratio of the activated carbon to the copper nitrate solution is 1:3.

[0071] The activated carbon was added to the copper nitrate solution and reacted at a hydrothermal temperature of 180°C for 12 hours. The solution was taken out and calcined under nitrogen protection at a temperature of 450°C for 8 hours to obtain modified activated carbon.

[0072] Preparation of composite filter media

[0073] Preparation: 15 parts of modified zeolite molecular sieve; 7.5 parts of modified activated carbon; 25 parts of sponge crumbs; the particle size of the sponge crumbs is 1 mm.

[0074] The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs and modified zeolite molecular sieve are added into the mixed solution, and the mixture is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0075] Example 4

[0076] Preparation of modified zeolite molecular sieves

[0077] Prepare the raw materials: zeolite molecular sieve with a diameter of 120 mesh; cobalt nitrate solution with a concentration of 0.06 mol / L and nickel nitrate solution with a concentration of 0.7 mol / L.

[0078] Add the zeolite molecular sieve into the cobalt nitrate solution, stir, and perform the first impregnation. The first impregnation time is 5 hours;

[0079] The zeolite molecular sieve after the first impregnation was taken out and directly added into the nickel nitrate solution, stirred, and then impregnated for the second time. The second impregnation time was 3.5 hours;

[0080] The zeolite molecular sieve impregnated for the second time was taken out, dried, and then heated to 650° C. at a heating rate of 6° C. and calcined for 8 h to prepare a modified zeolite molecular sieve.

[0081] Preparation of modified activated carbon

[0082] Preparation: activated carbon and copper nitrate solution with a concentration of 1.2 mol / L; wherein the volume ratio of the activated carbon to the copper nitrate solution is 1:2.2.

[0083] Activated carbon was added to copper nitrate solution and reacted at a hydrothermal temperature of 170°C for 9 hours. The solution was taken out and calcined under nitrogen protection at a temperature of 420°C for 5 hours to obtain modified activated carbon.

[0084] Preparation of composite filter media

[0085] Preparation: 15 parts of modified zeolite molecular sieve; 10 parts of modified activated carbon; 30 parts of sponge crumbs; the particle size of the sponge crumbs is 0.8 mm.

[0086] The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs and modified zeolite molecular sieve are added into the mixed solution, and the mixture is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0087] Comparative Example 1

[0088] In Comparative Example 1, activated carbon is used as the anti-poison adsorption filter material.

[0089] Comparative Example 2

[0090] Comparative Example 2: A mixture of the modified zeolite molecular sieve and modified activated carbon in Example 1 is used as an anti-poison adsorption filter material and is compounded according to the proportions of Example 1.

[0091] Comparative Example 3

[0092] The composite filter material provided in Comparative Example 3 does not contain modified zeolite molecular sieve compared to Example 1. The modified activated carbon prepared by the same method as Example 1 is used, and the specific preparation process is as follows:

[0093] Preparation: 20 parts of modified activated carbon; 20 parts of sponge crumbs; the particle size of the sponge crumbs is 0.6 mm.

[0094] The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs are added into the mixed solution, which is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0095] Comparative Example 4

[0096] The composite filter material provided in Comparative Example 4 does not contain modified activated carbon compared to Example 1. The modified zeolite molecular sieve prepared by the same method as Example 1 is used, and the specific preparation process is as follows:

[0097] Preparation: 20 parts of modified zeolite molecular sieve; 20 parts of sponge crumbs; the particle size of the sponge crumbs is 0.6 mm.

[0098] The modified zeolite molecular sieve is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs are added into the mixed solution, which is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0099] Comparative Example 5

[0100] The zeolite molecular sieve provided in Comparative Example 5 is an unmodified material, and the modified activated carbon is prepared by the same method as in Example 1.

[0101] Preparation of composite filter media

[0102] Preparation: 10 parts of zeolite molecular sieve, 10 parts of modified activated carbon, and 20 parts of sponge crumbs; the particle size of the sponge crumbs is 0.6 mm.

[0103] The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crushed and zeolite molecular sieve are added into the mixed solution, which is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0104] Comparative Example 6

[0105] The activated carbon provided in Comparative Example 6 is an unmodified material, and the modified zeolite molecular sieve is prepared by the same method as in Example 1.

[0106] Preparation of composite filter media

[0107] Preparation: 10 parts of modified zeolite molecular sieve, 10 parts of activated carbon, and 20 parts of sponge crumbs; the particle size of the sponge crumbs is 0.6 mm.

[0108] The activated carbon is added into the polyethylene glycol 200 solvent and mixed, and then the sponge crumbs and the modified zeolite molecular sieve are added into the mixed solution, and the mixture is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0109] Comparative Example 7

[0110] Comparative Example 7 uses the modified zeolite molecular sieve and modified activated carbon prepared by the same method as Example 1; the difference is that the addition ratio between the modified zeolite molecular sieve and the modified activated carbon is changed, as shown below.

[0111] Comparative Example 7-Group A

[0112] Preparation of composite filter media

[0113] Preparation: 4.6 parts of modified zeolite molecular sieve, 15.4 parts of modified activated carbon, and 20 parts of sponge crumbs; the particle size of the sponge crumbs is 0.6 mm.

[0114] The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs and modified zeolite molecular sieve are added into the mixed solution, and the mixture is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0115] Comparative Example 7-Group B

[0116] Preparation of composite filter media

[0117] Preparation: 15 parts of modified zeolite molecular sieve, 5 parts of modified activated carbon, and 20 parts of sponge crumbs; the particle size of the sponge crumbs is 0.6 mm.

[0118] The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs and modified zeolite molecular sieve are added into the mixed solution, and the mixture is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

[0119] Comparative Example 8

[0120] Compared with Example 1, Comparative Example 8 changes the preparation process of the modified zeolite molecular sieve, and the preparation process and raw material ratio of the modified activated carbon and the composite filter material are exactly the same as those of Example 1.

[0121] Preparation of modified zeolite molecular sieves

[0122] Prepare the raw materials: zeolite molecular sieve with a diameter of 100 mesh; cobalt nitrate solution with a concentration of 0.04 mol / L and nickel nitrate solution with a concentration of 0.5 mol / L.

[0123] Add the zeolite molecular sieve into the mixed solution of cobalt nitrate solution and nickel nitrate, stir, and soak for 6 hours;

[0124] The impregnated zeolite molecular sieve was taken out, dried, and then heated to 450° C. at a heating rate of 8° C. and calcined for 10 hours to prepare a modified zeolite molecular sieve.

[0125] Test Case

[0126] A test device is provided, comprising a first box and a second box of the same volume, wherein a conduit is arranged between the first box and the second box, the diameter of the conduit is 5 cm, a filter wall formed by filter material is arranged in the middle of the conduit, the length of the filter wall is 5 cm, and the side of the filter wall is in close contact with the interior of the conduit.

[0127] The filter materials containing sponge crumbs in Examples 1-4 and Comparative Examples 1-8 are used to form filter walls, and the filter materials without sponge crumbs are prepared with the same mass as that used for the filter wall formed in Example 1, and filled into a filter box of a suitable size to form a filter wall.

[0128] Smoke generated by incomplete combustion of oil, carbon monoxide and air are continuously added into the first box, wherein the light reduction rate of the smoke reaches 60% obs / m and the concentration of carbon monoxide is 5%. The second box is initially kept in a vacuum state.

[0129] Under positive pressure conditions, the gas in the first box is controlled at 0.4L / min.cm 2 The air flow flows into the second box at a specific speed.

[0130] After 45 minutes, the gas filtered by the filter wall was tested for content. The specific test results are shown in Table 1. There was basically no concentration below 0.0025%.

[0131] Table 1

[0132]

[0133]

[0134] From the test results in Table 1, it can be seen that by using the composite filter material for gas masks provided by the present application, the modified zeolite molecular sieve and the modified activated carbon material are evenly loaded on the sponge crumbs. By controlling the loading amount, the prepared composite filter material for gas masks can simultaneously have a good adsorption effect on the solid smoke particles and carbon monoxide generated in the fire, and can achieve excellent protection within 45 minutes.

[0135] Comparative Example 1 uses only activated carbon as an anti-toxic filter material. From the test results, it can be seen that it has a poor adsorption effect on both solid particles and carbon monoxide. Comparative Example 2 does not use sponge crushing, and the zeolite molecular sieve and activated carbon have poor dispersibility and high agglomeration, which makes the adsorption conversion effect of the prepared composite filter material poor. Comparative Examples 3 and 4 did not add modified zeolite molecular sieves and modified activated carbon, respectively, and the adsorption effect of the composite filter material was poor. Comparative Examples 5 and 6 used unmodified zeolite molecular sieves and unmodified activated carbon, respectively. Comparative Example 7 adjusted the addition ratio of modified zeolite molecular sieves and modified activated carbon in the preparation process of composite filter materials. Comparative Example 8 adjusted the impregnation method of cobalt nitrate and nickel nitrate solutions in the preparation process of modified zeolite molecular sieves. The test results show that they will affect the adsorption effect of the composite filter material.

[0136] It can be seen that the composite filter material for gas masks provided by the present application, the combination of cobalt nickel oxide and copper oxide forms excellent conversion performance for carbon monoxide toxic gas. At the same time, the load modification can provide zeolite molecular sieve and activated carbon with good dispersion ability on sponge crumbs, reduce agglomeration, and can be stably suspended in the sponge crumbs. Through the mutual cooperation of zeolite molecular sieve and activated carbon, it can have an excellent isolation effect on solid smoke particles, has high practical value, and is easy to promote.

[0137] Example 5

[0138] Preparation of raw needle-punched cotton

[0139] S1, putting the raw polyester fiber into a cotton mixing box for loosening and mixing, and then transporting it to a middle warehouse cotton mixing box to mix the cotton layer evenly by vibration;

[0140] S2, using a carding machine to comb the surface layer obtained in S1 into a single fiber state, and then form a mesh fiber layer, which is assembled into fiber strips and transported to a web laying machine;

[0141] S3, using a web laying machine to lay the fiber strips, and after the web is formed, it is transported to a needle punching machine;

[0142] S4, using a needle punching machine to pre-reinforce the fiber web to form a grey cloth, and then using a barb with barbed hooks on the edges of the cross section to reinforce the fiber web again, repeatedly puncturing, and then performing a hot rod forming process and a roll process to obtain the original needle-punched cotton.

[0143] The original needle-punched cotton was cut into sheets with a diameter of 5 cm and a thickness of 1 cm.

[0144] Preparation of needle-punched cotton for gas masks

[0145] Step 1, adding the composite filter material for the gas mask prepared in Example 1 into anhydrous ethanol, and performing ultrasonic dispersion to obtain a mixed solvent;

[0146] Step 2, soaking the original needle-punched cotton in the mixed solvent obtained in step 1, and drying it to obtain the needle-punched cotton for gas mask;

[0147] Wherein, in step 1, the weight ratio of the composite filter material for gas masks to anhydrous ethanol is 1:5; in the obtained needle-punched cotton for gas masks, the weight ratio of the composite filter material is 40%.

[0148] Preferably, the weight ratio of the composite filter material for gas masks to anhydrous ethanol is 1:4-8; in the obtained needle-punched cotton for gas masks, the weight ratio of the composite filter material is 30%-50%.

[0149] Through research, it is found that loading the composite filter material provided in the present application on a needle-punched nonwoven fabric can achieve a better anti-virus filtering effect.

[0150] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite filter material for a gas mask, characterized in that: The following raw materials are included in parts by weight: 5-15 parts of modified zeolite molecular sieve; 5-15 parts of modified activated carbon; 15-30 portions of sponge crumbs; The particle size of the sponge crumbs is less than 1 mm; Wherein, the modified zeolite molecular sieve is a cobalt-nickel oxide-loaded zeolite molecular sieve material; and the modified activated carbon is a copper oxide-loaded activated carbon material.

2. The composite filter material for a gas mask according to claim 1, characterized in that: The weight ratio of the modified zeolite molecular sieve to the modified activated carbon is 0.5 to 2:

1.

3. The composite filter material for a gas mask according to claim 1, characterized in that: The modified zeolite molecular sieve is mainly prepared by the following method: Add the zeolite molecular sieve into the cobalt nitrate solution, stir, and perform the first impregnation, the first impregnation time is more than 4 hours; The zeolite molecular sieve after the first impregnation is taken out and directly added into the nickel nitrate solution, stirred, and then impregnated for the second time, and the second impregnation time is more than 3 hours; The zeolite molecular sieve impregnated for the second time is taken out, dried and calcined to prepare a modified zeolite molecular sieve; Wherein, the diameter of the zeolite molecular sieve is 50-150 meshes; the concentration of the cobalt nitrate solution is 0.035-0.065 mol / L; and the concentration of the nickel nitrate is 0.3-0.8 mol / L.

4. The composite filter material for a gas mask according to claim 3, characterized in that: The first immersion time is 4 to 8 hours; the second immersion time is 3 to 5 hours.

5. The composite filter material for a gas mask according to claim 3, characterized in that: The calcination process is to increase the temperature to 550-700°C at a rate of 5-10°C and calcine for 6-12h.

6. The composite filter material for a gas mask according to claim 1, characterized in that: The modified activated carbon is mainly prepared by the following method: Add activated carbon to copper nitrate solution and react at a hydrothermal temperature of 150-180° C. for 6-12 hours. Take out the solution and calcine the solution under nitrogen protection to obtain modified activated carbon.

7. The composite filter material for a gas mask according to claim 6, characterized in that: The volume ratio of the activated carbon to the copper nitrate solution is 1:2-3; the concentration of the copper nitrate solution is 0.8-1.5 mol / L; The calcination temperature is 350-450°C, and the calcination time is 4-8 hours.

8. A method for preparing a composite filter material for a gas mask as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: The modified activated carbon is added into polyethylene glycol 200 solvent and mixed, and then sponge crumbs and modified zeolite molecular sieve are added into the mixed solution, and the mixture is fully stirred, filtered and dried to obtain a composite filter material for a gas mask.

9. A needle-punched cotton for a gas mask, characterized in that: The method comprises the following steps: Step 1, adding the composite filter material for a gas mask as described in any one of claims 1 to 7 into anhydrous ethanol, and ultrasonically dispersing the mixture to obtain a mixed solvent; Step 2, soaking the original needle-punched cotton in the mixed solvent obtained in step 1, and drying it to obtain the needle-punched cotton for gas mask; Wherein, in step 1, the weight ratio of the composite filter material for gas masks to anhydrous ethanol is 1:4-8; in the obtained needle-punched cotton for gas masks, the weight ratio of the composite filter material is 30%-50%.

10. The needle-punched cotton for gas mask according to claim 9, characterized in that: The original needle-punched cotton is prepared by the following method: S1, putting the raw polyester fiber into a cotton mixing box for loosening and mixing, and then transporting it to a middle warehouse cotton mixing box to mix the cotton layer evenly by vibration; S2, using a carding machine to comb the surface layer obtained in S1 into a single fiber state, and then form a mesh fiber layer, which is assembled into fiber strips and transported to a web laying machine; S3, using a web laying machine to lay the fiber strips, and after the web is formed, it is transported to a needle punching machine; S4, using a needle punching machine to pre-reinforce the fiber web to form a grey cloth, and then using a barb with barbed hooks on the edges of the cross section to reinforce the fiber web again, repeatedly puncturing, and then performing a hot rod forming process and a roll process to obtain the original needle-punched cotton.

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