Fiber material for air purification and method for manufacturing cigarette filter tip by using fiber material

Abstract

The invention relates to the technical field of adsorption materials, in particular to a fiber material for air purification and a method for manufacturing a cigarette filter tip by using the fiber material. A preparation method of the fiber material for air purification comprises the following steps: (1) adsorbent modification: placing an adsorbent in an acid solution for reaction, and preparing a modified adsorbent after the reaction is finished; (2) reacting the modified adsorbent with tea polyphenol to prepare a reactant M; (3) reacting inulin with citric acid to obtain a reactant N; (4) reacting the reactant M with the reactant N to prepare sol P; and (5) dissolving the sol P in an organic solvent to obtain a spinning solution, drafting and spinning to obtain a fiber material, and the solid content of the spinning solution is 10-30%. The fiber material for air purification provided by the invention has excellent air pollutant filtering effect and mechanical properties, can be recycled, and has wide application prospects in preparation of air filtering materials or protection equipment.

Description

Technical Field

[0001] The invention relates to the technical field of adsorption materials, and in particular to a fiber material for air purification and a method for manufacturing a cigarette filter using the fiber material. Background Art

[0002] Air is the life gas that humans rely on for survival. The human body breathes more than 20,000 times a day on average, and the amount of air intake required is maintained at 15-20m 3 In order to maintain normal life functions. However, with the rapid development of modern industry and transportation, the composition of the atmosphere has changed dramatically, and air pollution has become increasingly serious, becoming the biggest environmental problem facing the world today. Air pollution mainly refers to suspended inorganic / organic fine particles (PM) and volatile organic compounds (VOCs). VOCs include NH3, COx, toxic sulfur oxides (SOx), nitrogen oxides (NOx), benzene and other volatile organic compounds.

[0003] As early as 2013, the International Agency for Research on Cancer (IARC) identified outdoor air pollution as a new class of carcinogens, with the same carcinogenicity level as smoking, breathing formaldehyde, and eating moldy food. The Lancet Commission on Pollution and Health released a survey in 2017 showing that in 2015 alone, as many as 7 million premature deaths worldwide were related to air pollution, of which about 40% were caused by indoor air pollution and the rest died from ambient air pollution. The 2019 State of the Global Air report estimated that air pollution shortens life expectancy by 20 months.

[0004] Therefore, it is necessary to vigorously develop air filtration materials to reduce the serious harm caused by air pollution to humans and the environment and solve the above technical problems. Summary of the invention

[0005] One of the purposes of the present application is to provide a method for preparing a fiber material for air purification. The fiber material prepared by this method can solve or alleviate the problems existing in the above-mentioned prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides a method for preparing a fiber material for air purification using the following technical scheme:

[0007] A method for preparing a fiber material for air purification comprises the following steps:

[0008] (1) Adsorbent modification, placing the adsorbent in an acidic solution for reaction, and obtaining a modified adsorbent after the reaction is completed;

[0009] (2) reacting the modified adsorbent with tea polyphenols to obtain a reactant M;

[0010] (3) reacting inulin with citric acid to obtain reactant N;

[0011] (4) reacting reactant M with reactant N to obtain sol P;

[0012] (5) dissolving the sol P in an organic solvent to obtain a spinning solution, and obtaining a fiber material through drawing and spinning. The organic solvent is selected from cyclohexanone, dimethylformamide, N,N-dimethylformamide, N,N-dimethylacetamide or tetrahydrofuran; the solid content of the spinning solution is 10 to 30%.

[0013] Preferably, in step (1), the adsorbent is placed in an acidic solution for reaction at 25 to 50° C., and after the reaction is completed, the modified adsorbent is obtained by washing and drying. The adsorbent is at least one of aerogel, activated alumina, silica gel, and molecular sieves. The acidic solution is a trichloroacetic acid solution or a mellitic acid solution, and the mass fraction of the trichloroacetic acid solution or the mellitic acid solution is 0.1 to 5%. The mass ratio of the adsorbent to the acid in the acidic solution is 8 to 12:1.

[0014] Further preferably, during the reaction, a polycarboxylic acid polyamine glutaraldehyde polymer is added, and the mass ratio of the polycarboxylic acid polyamine glutaraldehyde polymer to the adsorbent is 0.01-0.1:1; the polycarboxylic acid polyamine glutaraldehyde polymer is prepared by the following steps: adipic acid and butene glycol in a molar ratio of 1.0-1.2:1.0 are reacted at 160-180°C for 1-12h, then, stirred evenly after addition, glutaraldehyde is added at 40-55°C and the reaction is continued for 1-8h; the mass ratio of water to butene glycol is 10-20, and the molar ratio of butene glycol to glutaraldehyde is 1.0:1.0-1.2.

[0015] Preferably, in step (2), at 50-100° C., the modified adsorbent and tea polyphenols are reacted in an aqueous solution containing a catalytic system to obtain a reactant M, and the mass ratio of the modified adsorbent to the tea polyphenols is 1:0.5-5; the catalytic system comprises a hydrogen-type molecular sieve, a super absorbent resin and tannic acid; the mass ratio of the hydrogen-type molecular sieve, the super absorbent resin and tannic acid is 1:0.5-2:0.5-2, and the mass ratio of the hydrogen-type molecular sieve to the tea polyphenols is 0.01-0.1:1.

[0016] Further preferably, the super absorbent resin is polyacrylic acid resin, starch acrylate polymer, starch-acrylonitrile graft copolymer or acrylamide-acrylonitrile-acrylic acid terpolymer.

[0017] Preferably, in step (3), at 50-100° C., inulin and citric acid are reacted in a mixed solution comprising a hydrazine sulfate solution and a sodium hydroxide solution to obtain reactant N; the mass ratio of inulin to citric acid is 1:5-10, the mass ratio of hydrazine sulfate to sodium hydroxide is 0.5-1:1, and the mass ratio of citric acid to citric acid is 0.5-1:1.

[0018] The mass ratio to the mixed solution is 1:5~15.

[0019] Preferably, in step (4), reactant M and reactant N are reacted in an aqueous solution comprising acetic acid and glacial acetic acid at 30-50° C. to obtain sol P, wherein the volume ratio of acetic acid to glacial acetic acid is 1:1, and the mass fraction of acetic acid is 0.1-5%, and the mass ratio of reactant M to reactant N is 1-3:7-9.

[0020] The second purpose of the present application is to provide a fiber material for air purification, which can solve or alleviate the problems existing in the above-mentioned prior art.

[0021] In order to achieve the above-mentioned purpose, the fiber material for air purification provided in the present application adopts the following technical solution:

[0022] A fiber material for air purification is prepared by adopting the preparation method of the fiber material for air purification.

[0023] The third purpose of this application is to provide an application of fiber material for air purification.

[0024] In order to achieve the above-mentioned purpose, the fiber material for air purification provided in the present application adopts the following technical solution:

[0025] Use of the fiber material for air purification as described above in preparing air purification materials, air filter materials, protective equipment or filter tips.

[0026] A fourth object of the present application is to provide a fiber material for air purification for use in making cigarette filters.

[0027] In order to achieve the above-mentioned purpose, the application of a fiber material for air purification provided in the present application in making a cigarette filter adopts the following technical solution:

[0028] A method for making a cigarette filter using the fiber material for air purification as described above comprises the following steps: at room temperature, 10-60 parts of fiber material, 5-15 parts of modified adsorbent, 5-20 parts of tea polyphenols, 5-20 parts of inulin, 1-10 parts of bacillus, 1-10 parts of streptomyces, 5-15 parts of soybean protein and 10-60 parts of water are mixed, and then the mixture is fed into an extruder, and the feeding section, melting section and puffing heating temperatures are controlled to fully puff and shape the mixture to obtain a cigarette filter.

[0029] Beneficial effects:

[0030] (1) The present invention first modifies the adsorbent to obtain a modified adsorbent with -COOH on the surface. During the modification process, a polycarboxylic acid polyamine glutaraldehyde polymer is added to make the adsorbent more evenly dispersed in the acidic solution, thereby avoiding incomplete surface modification of the adsorbent due to agglomeration. The present invention reacts the modified adsorbent with tea polyphenols to prepare a reactant M. The -OH on the surface of the tea polyphenols and the -COOH on the surface of the modified adsorbent form a chemical bond through a chemical reaction, thereby connecting the tea polyphenols on the surface of the modified adsorbent. The catalytic system for the reaction of the modified adsorbent with the tea polyphenols includes a hydrogen-type molecular sieve, a super absorbent resin and tannic acid. The reaction is catalyzed by reusable hydrogen-type molecular sieves and super absorbent resins, which accelerates the reaction speed while saving energy and protecting the raw materials. Inulin reacts with citric acid to obtain a reactant N, which then reacts with the reactant M to form a network inter-transfer structure.

[0031] (2) The fiber material of the present invention has an excellent interception effect on air pollutants while maintaining excellent mechanical properties.

[0032] (3) The raw materials of the fiber material of the present invention, tea polyphenols, inulin and citric acid, are all green and degradable materials, which reduce resource waste, save costs, are environmentally friendly, and can effectively alleviate the pollution problem of disposable protective products.

[0033] (4) The fiber material for air purification provided by the present invention has excellent air pollutant filtering effect and mechanical properties, and has broad application prospects in the preparation of air filtering materials or protective equipment. DETAILED DESCRIPTION

[0034] The present application is described in detail below in conjunction with embodiments. Each example is provided by way of explanation of the present application but does not limit the present application. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as a part of an embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention should belong to the scope of protection of the embodiments of the present invention.

[0035] A method for preparing a fiber material for air purification comprises the following steps:

[0036] (1) Adsorbent modification, placing the adsorbent in an acidic solution for reaction, and obtaining a modified adsorbent after the reaction is completed;

[0037] (2) reacting the modified adsorbent with tea polyphenols to obtain a reactant M;

[0038] (3) reacting inulin with citric acid to obtain reactant N;

[0039] (4) reacting reactant M with reactant N to obtain sol P;

[0040] (5) dissolving the sol P in an organic solvent to obtain a spinning solution, and obtaining a fiber material through drawing and spinning. The organic solvent is selected from cyclohexanone, dimethylformamide, N,N-dimethylformamide, N,N-dimethylacetamide or tetrahydrofuran; the solid content of the spinning solution is 10 to 30%.

[0041] Page 4

[0042] Preferably, in step (1), the adsorbent is placed in an acidic solution for reaction at 25 to 50° C., and after the reaction is completed, the modified adsorbent is obtained by washing and drying. The adsorbent is at least one of aerogel, activated alumina, silica gel, and molecular sieves. The acidic solution is a trichloroacetic acid solution or a mellitic acid solution, and the mass fraction of the trichloroacetic acid solution or the mellitic acid solution is 0.1 to 5%. The mass ratio of the adsorbent to the acid in the acidic solution is 8 to 12:1.

[0043] Further preferably, during the reaction, a polycarboxylic acid polyamine glutaraldehyde polymer is added, and the mass ratio of the polycarboxylic acid polyamine glutaraldehyde polymer to the adsorbent is 0.01-0.1:1; the polycarboxylic acid polyamine glutaraldehyde polymer is prepared by the following steps: adipic acid and butene glycol in a molar ratio of 1.0-1.2:1.0 are reacted at 160-180°C for 1-12h, then, stirred evenly after addition, glutaraldehyde is added at 40-55°C and the reaction is continued for 1-8h; the mass ratio of water to butene glycol is 10-20, and the molar ratio of butene glycol to glutaraldehyde is 1.0:1.0-1.2.

[0044] Preferably, in step (2), at 50-100° C., the modified adsorbent and tea polyphenols are reacted in an aqueous solution containing a catalytic system to obtain a reactant M, and the mass ratio of the modified adsorbent to the tea polyphenols is 1:0.5-5; the catalytic system comprises a hydrogen-type molecular sieve, a super absorbent resin and tannic acid; the mass ratio of the hydrogen-type molecular sieve, the super absorbent resin and tannic acid is 1:0.5-2:0.5-2, and the mass ratio of the hydrogen-type molecular sieve to the tea polyphenols is 0.01-0.1:1.

[0045] Further preferably, the super absorbent resin is polyacrylic acid resin, starch acrylate polymer, starch-acrylonitrile graft copolymer or acrylamide-acrylonitrile-acrylic acid terpolymer.

[0046] Preferably, in step (3), at 50-100° C., inulin and citric acid are reacted in a mixed solution comprising a hydrazine sulfate solution and a sodium hydroxide solution to obtain reactant N; the mass ratio of the inulin to the citric acid is 1:5-10, the mass ratio of the hydrazine sulfate to the sodium hydroxide is 0.5-1:1, and the mass ratio of the citric acid to the mixed solution is 1:5-15.

[0047] Preferably, in step (4), reactant M and reactant N are reacted in an aqueous solution comprising acetic acid and glacial acetic acid at 30-50° C. to obtain sol P, wherein the volume ratio of acetic acid to glacial acetic acid is 1:1. The mass fraction of acetic acid is 0.1-5%, and the mass ratio of reactant M to reactant N is 1-3:7-9.

[0048] A fiber material for air purification is prepared by adopting the preparation method of the fiber material for air purification.

[0049] Use of the fiber material for air purification as described above in preparing air purification materials, air filter materials, protective equipment or filter tips.

[0050] A method for making a cigarette filter using the fiber material for air purification as described above comprises the following steps: at room temperature, 20-60 parts of fiber material, 5-15 parts of modified adsorbent, 5-20 parts of tea polyphenols, 5-20 parts of inulin, 1-10 parts of bacillus, 1-10 parts of streptomyces, 5-15 parts of soybean protein and 30-60 parts of water are mixed, and then the mixture is fed into an extruder, and the feeding section, melting section and puffing heating temperatures are controlled to fully puff and shape the mixture to obtain a cigarette filter.

[0051] Example 1

[0052] A method for preparing a fiber material for air purification comprises the following steps:

[0053] (1) Adsorbent modification: placing the aerogel in a trichloroacetic acid solution at 25° C. for reaction, washing and drying after the reaction to obtain a modified adsorbent, wherein the mass fraction of the trichloroacetic acid solution is 0.1%; and the mass ratio of the aerogel to the trichloroacetic acid is 8:1.

[0054] (2) At 50° C., the modified adsorbent and tea polyphenols are reacted in an aqueous solution containing a catalytic system to obtain a reactant M, wherein the mass ratio of the modified adsorbent to the tea polyphenols is 1:0.5; the catalytic system comprises a hydrogen-type molecular sieve, a super absorbent resin and tannic acid; the mass ratio of the hydrogen-type molecular sieve, the super absorbent resin and the tannic acid is 1:0.5:0.5, and the mass ratio of the hydrogen-type molecular sieve to the tea polyphenols is 0.01:1; and the super absorbent resin is a polyacrylic acid resin.

[0055] (3) At 50° C., reacting inulin with citric acid in a mixed solution including a hydrazine sulfate solution and a sodium hydroxide solution to obtain reactant N; the mass ratio of inulin to citric acid is 1:5, the mass ratio of hydrazine sulfate to sodium hydroxide is 0.5:1, and the mass ratio of citric acid to the mixed solution is 1:5.

[0056] (4) At 30° C., reactant M and reactant N are reacted in an aqueous solution including acetic acid and glacial acetic acid to obtain sol P, wherein the volume ratio of acetic acid to glacial acetic acid is 1:1. The mass fraction of acetic acid is 0.1%, and the mass ratio of reactant M to reactant N is 1:9.

[0057] (5) Sol P is dissolved in dimethylformamide to obtain a spinning solution, and a fiber material is obtained through drawing and spinning. The solid content of the spinning solution is 10%.

[0058] Example 2

[0059] A method for preparing a fiber material for air purification comprises the following steps:

[0060] (1) Adsorbent modification: at 30°C, activated alumina (Naco Corporation, 99% content) was placed in a trichloroacetic acid solution, and a polycarboxylic acid polyamine glutaraldehyde polymer was added to react. After the reaction, the modified adsorbent was obtained by washing and drying. The mass fraction of trichloroacetic acid in the trichloroacetic acid solution was 1%; the activated alumina was placed in a trichloroacetic acid solution, and a polycarboxylic acid polyamine glutaraldehyde polymer was added to react.

[0061] The mass ratio of aluminum to trichloroacetic acid is 9:1. The mass ratio of polycarboxylic acid polyamine glutaraldehyde polymer to adsorbent is 0.03:1; the polycarboxylic acid polyamine glutaraldehyde polymer is prepared by the following steps: adipic acid and butenediol in a molar ratio of 1.0:1.0 are reacted at 160°C for 6 hours, then, after adding and stirring evenly, glutaraldehyde is added at 40°C and the reaction is continued for 2 hours; the mass ratio of water to butenediol is 10, and the molar ratio of butenediol to glutaraldehyde is 1.0:1.0.

[0062] (2) At 60° C., the modified adsorbent and tea polyphenols are reacted in an aqueous solution containing a catalytic system to obtain a reactant M, wherein the mass ratio of the modified adsorbent to the tea polyphenols is 1:1; the catalytic system includes a hydrogen-type molecular sieve, a super absorbent resin and tannic acid; the mass ratio of the hydrogen-type molecular sieve, the super absorbent resin and the tannic acid is 1:0.5:0.5, and the mass ratio of the hydrogen-type molecular sieve to the tea polyphenols is 0.01:1; the super absorbent resin is a polyacrylic acid resin.

[0063] (3) At 50° C., reacting inulin with citric acid in a mixed solution including a hydrazine sulfate solution and a sodium hydroxide solution to obtain reactant N; the mass ratio of inulin to citric acid is 1:5, the mass ratio of hydrazine sulfate to sodium hydroxide is 0.5:1, and the mass ratio of citric acid to the mixed solution is 1:5.

[0064] (4) At 30° C., reactant M and reactant N are reacted in an aqueous solution including acetic acid and glacial acetic acid to obtain sol P, wherein the volume ratio of acetic acid to glacial acetic acid is 1:1; the mass fraction of acetic acid is 0.1%, and the mass ratio of reactant M to reactant N is 1:9.

[0065] (5) Sol P is dissolved in cyclohexanone to obtain a spinning solution, and a fiber material is obtained through drawing and spinning. The solid content of the spinning solution is 20%.

[0066] Example 3

[0067] A method for preparing a fiber material for air purification comprises the following steps:

[0068] (1) Adsorbent modification: at 40°C, silica gel (purchased from Tianjin Zhengyuan Haoye) was placed in a mellitic acid solution (solvent water), and polycarboxylic acid polyamine glutaraldehyde polymer was added to react. After the reaction, the modified adsorbent was obtained by washing and drying. The mass fraction of the mellitic acid solution was 3%; the mass ratio of silica gel to mellitic acid was 10:1. The mass ratio of polycarboxylic acid polyamine glutaraldehyde polymer to the adsorbent was 0.07:1; the polycarboxylic acid polyamine glutaraldehyde polymer was obtained by the following steps: adipic acid and butene glycol in a molar ratio of 1.1:1.0 were reacted at 170°C for 10 hours, then, after adding, stirred evenly, glutaraldehyde was added at 50°C and continued to react for 6 hours to obtain the adsorbent; the mass ratio of water to butene glycol was 15, and the molar ratio of butene glycol to glutaraldehyde was 1.0:1.1.

[0069] (2) At 80° C., the modified adsorbent and tea polyphenols are reacted in an aqueous solution containing a catalytic system to obtain a reactant M, wherein the mass ratio of the modified adsorbent to the tea polyphenols is 1:2; the catalytic system comprises a hydrogen-type molecular sieve, a super absorbent resin and tannic acid; the mass ratio of the hydrogen-type molecular sieve, the super absorbent resin and the tannic acid is 1:1:1, and the mass ratio of the hydrogen-type molecular sieve to the tea polyphenols is 0.05:1; and the super absorbent resin is an acrylamide-acrylonitrile-acrylic acid terpolymer.

[0070] (3) At 80° C., reacting inulin with citric acid in a mixed solution including a hydrazine sulfate solution and a sodium hydroxide solution to obtain reactant N; the mass ratio of inulin to citric acid is 1:8, the mass ratio of hydrazine sulfate to sodium hydroxide is 0.8:1, and the mass ratio of citric acid to the mixed solution is 1:10.

[0071] (4) At 40° C., reactant M and reactant N are reacted in an aqueous solution including acetic acid and glacial acetic acid to obtain sol P, wherein the volume ratio of acetic acid to glacial acetic acid is 1:1; the mass fraction of acetic acid is 2.5%, and the mass ratio of reactant M to reactant N is 2:8.

[0072] (5) Sol P is dissolved in N,N-dimethylformamide to obtain a spinning solution, and a fiber material is obtained through drawing and spinning. The solid content of the spinning solution is 25%.

[0073] Example 4

[0074] A method for preparing a fiber material for air purification comprises the following steps:

[0075] (1) Adsorbent modification: at 50°C, a molecular sieve (3A molecular sieve) is placed in a mellitic acid solution, and a polycarboxylic acid polyamine glutaraldehyde polymer is added to react. After the reaction is completed, the modified adsorbent is obtained by washing and drying. The mass fraction of the mellitic acid solution is 5%; the mass ratio of the adsorbent to the acid in the acidic solution is 12:1. The mass ratio of the polycarboxylic acid polyamine glutaraldehyde polymer to the adsorbent is 0.1:1; the polycarboxylic acid polyamine glutaraldehyde polymer is obtained by the following steps: adipic acid and butene glycol in a molar ratio of 1.2:1.0 are reacted at 180°C for 12h, then, after adding, the mixture is stirred evenly, and glutaraldehyde is added at 55°C and the reaction is continued for 8h to obtain the modified adsorbent; the mass ratio of water to butene glycol is 20, and the molar ratio of butene glycol to glutaraldehyde is 1.0:1.2.

[0076] (2) At 100° C., the modified adsorbent and tea polyphenols are reacted in an aqueous solution containing a catalytic system to obtain a reactant M, wherein the mass ratio of the modified adsorbent to the tea polyphenols is 1:5; the catalytic system comprises a hydrogen-type molecular sieve, a super absorbent resin and tannic acid; the mass ratio of the hydrogen-type molecular sieve, the super absorbent resin and the tannic acid is 1:2:1, and the mass ratio of the hydrogen-type molecular sieve to the tea polyphenols is 0.1:1; and the super absorbent resin is a polyacrylic acid resin.

[0077] (3) At 100° C., reacting inulin with citric acid in a mixed solution including a hydrazine sulfate solution and a sodium hydroxide solution to obtain reactant N; the mass ratio of inulin to citric acid is 1:10, the mass ratio of hydrazine sulfate to sodium hydroxide is 1:1, and the mass ratio of citric acid to the mixed solution is 1:15.

[0078] (4) At 50°C, reactant M and reactant N are reacted in an aqueous solution comprising acetic acid and glacial acetic acid to obtain sol P, wherein the volume ratio of acetic acid to glacial acetic acid is 1:1; and the mass fraction of acetic acid is

[0079] 5%, the mass ratio of reactant M to reactant N is 3:7.

[0080] (5) Sol P is dissolved in tetrahydrofuran to obtain a spinning solution, and a fiber material is obtained through drawing and spinning. The solid content of the spinning solution is 30%.

[0081] Example 5

[0082] A method for making a cigarette filter using a fiber material for air purification comprises the following steps:

[0083] At room temperature, the fiber material 58 prepared in Example 1, the modified adsorbent 5 prepared in Example 1, tea polyphenols 5, inulin 5, Bacillus 1, Streptomyces 1, soy protein 5 and water 20 are mixed and then fed into an extruder. The feeding section, melting section and puffing heating temperatures are controlled, and the cigarette filter is obtained after sufficient puffing and shaping.

[0084] Example 6

[0085] A method for making a cigarette filter using a fiber material for air purification comprises the following steps:

[0086] At room temperature, the fiber material 40 prepared in Example 2, the modified adsorbent 5 prepared in Example 2, tea polyphenols 5, inulin 5, Bacillus 5, Streptomyces 5, soy protein 5 and water 30 are mixed and then fed into an extruder. The feeding section, melting section and puffing heating temperatures are controlled, and the cigarette filter is obtained after sufficient puffing and shaping.

[0087] Example 7

[0088] A method for making a cigarette filter using a fiber material for air purification comprises the following steps:

[0089] At room temperature, the fiber material 30 prepared in Example 3, the modified adsorbent 10 prepared in Example 3, tea polyphenols 10, inulin 5, Bacillus 2.5, Streptomyces 2.5, soy protein 10 and water 30 are mixed and then fed into an extruder. The feeding section, melting section and puffing heating temperatures are controlled, and the cigarette filter is obtained after sufficient puffing and shaping.

[0090] Example 8

[0091] A method for making a cigarette filter using the fiber material for air purification as described above comprises the following steps:

[0092] At room temperature, the fiber material 40 prepared in Example 4, the modified adsorbent 5 prepared in Example 4, tea polyphenols 10, inulin 5, Bacillus 10, Streptomyces 5, soy protein 5 and water 20 are mixed and then fed into an extruder. The feeding section, melting section and puffing heating temperatures are controlled, and the cigarette filter is obtained after sufficient puffing and shaping.

[0093] Comparative Example 1

[0094] A method for preparing a fiber material for air purification comprises the following steps:

[0095] (1) Adsorbent modification: placing the aerogel in a trichloroacetic acid solution at 25° C. for reaction, washing and drying after the reaction to obtain a modified adsorbent, wherein the mass fraction of the trichloroacetic acid solution is 0.1%; and the mass ratio of the aerogel to the trichloroacetic acid is 8:1.

[0096] (2) At 50° C., the modified adsorbent and tea polyphenols are reacted in an aqueous solution containing a catalytic system to obtain a reactant M, wherein the mass ratio of the modified adsorbent to the tea polyphenols is 1:0.5; the catalytic system comprises a hydrogen-type molecular sieve, a super absorbent resin and tannic acid; the mass ratio of the hydrogen-type molecular sieve, the super absorbent resin and the tannic acid is 1:0.5:0.5, and the mass ratio of the hydrogen-type molecular sieve to the tea polyphenols is 0.01:1; and the super absorbent resin is a polyacrylic acid resin.

[0097] (3) The reactant M is dissolved in dimethylformamide to obtain a spinning solution, and a fiber material is obtained by drawing and spinning. The solid content of the spinning solution is 10%.

[0098] Comparative Example 2

[0099] A method for preparing a fiber material for air purification comprises the following steps:

[0100] (1) At 50° C., inulin and citric acid are reacted in a mixed solution including a hydrazine sulfate solution and a sodium hydroxide solution to obtain a reactant N; the mass ratio of inulin to citric acid is 1:5, the mass ratio of hydrazine sulfate to sodium hydroxide is 0.5:1, and the mass ratio of citric acid to the mixed solution is 1:5.

[0101] (2) The reactant N is dissolved in dimethylformamide to obtain a spinning solution, and a fiber material is obtained by drawing and spinning. The solid content of the spinning solution is 10%.

[0102] Comparative Example 3

[0103] A method for preparing a fiber material for air purification comprises the following steps:

[0104] (1) Adsorbent modification: placing the aerogel in a trichloroacetic acid solution at 25° C. for reaction, washing and drying after the reaction to obtain a modified adsorbent, wherein the mass fraction of the trichloroacetic acid solution is 0.1%; and the mass ratio of the aerogel to the trichloroacetic acid is 8:1.

[0105] (2) At 50° C., the modified adsorbent, tea polyphenols, inulin and citric acid are reacted in a mixed solution of a hydrazine sulfate solution and a sodium hydroxide solution to obtain a reactant O, wherein the mass ratio of the modified adsorbent to the tea polyphenols is 1:0.5; the mass ratio of inulin to citric acid is 1:5; the mass ratio of hydrazine sulfate to sodium hydroxide is 0.5:1; the mass ratio of citric acid to the mixed solution is 1:5; and the mass ratio of tea polyphenols to citric acid is 1:7.

[0106] (5) The reactant O is dissolved in dimethylformamide to obtain a spinning solution, and a fiber material is obtained through drawing and spinning. The solid content of the spinning solution is 10%.

[0107] Comparative Examples 4-6

[0108] Page 10

[0109] The fiber materials obtained in Comparative Examples 1-3 were made into cigarette filters using the method of Example 5.

[0110] Characterization and analysis

[0111] The fiber materials obtained in Examples 1-4 and Comparative Examples 1-3 were tested for their adsorption properties (placed at 20 m 3 The results of the mechanical property tests are shown in Table 1.

[0112] Table 1 Test results of adsorption and mechanical properties of fiber materials

[0113]

[0114] It can be seen from Table 1 that the fiber material prepared by the present invention has a good adsorption effect on VOC, formaldehyde and benzene, and maintains excellent mechanical properties.

[0115] The cigarette filters prepared in Examples 5-8 of the present invention and Comparative Examples 4-6 were tested for performance. The release of total particulate matter, nicotine and water in mainstream cigarette smoke was measured according to the methods of GB / T19609-2004 "Determination of total particulate matter and tar by conventional analytical smoking machine for cigarettes", GB / T23355-2009 "Gas chromatography method for determination of nicotine in total particulate matter of cigarettes" and GB / T23203.1-2013 "Determination of moisture in total particulate matter of cigarettes Part 1: Gas chromatography". The results are shown in Table 2.

[0116] Table 2 Cigarette filter performance test results

[0117]

[0118]

[0119] It can be seen from Table 2 that the cigarette filters prepared in Examples 5-8 of the present invention are able to adsorb harmful substances in cigarettes with significant effects.

[0120] The degradation rate of the cigarette filter prepared in the present invention was tested according to ISO 14855. The results showed that the degradation rate of the cigarette filter prepared in Examples 5 to 8 of the present invention reached 97.6% within 60 days, indicating that the degradation effect was very good.

[0121] The raw materials of the fiber material of the present invention, tea polyphenols, inulin and citric acid, are all green and degradable materials, which reduce resource waste, save costs, are environmentally friendly, and can effectively alleviate the pollution problem of disposable protective products. The fiber material of the present invention has an excellent interception effect on air pollutants, and at the same time, it also maintains excellent mechanical properties. The fiber material for air purification provided by the present invention has excellent air pollutant filtering effect and mechanical properties, and has broad application prospects in the preparation of air filter materials or protective equipment.

[0122] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0123] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a fiber material for air purification, characterized in that: The following steps are involved: (1) Adsorbent modification, placing the adsorbent in an acidic solution for reaction, and obtaining a modified adsorbent after the reaction is completed; (2) reacting the modified adsorbent with tea polyphenols to obtain a reactant M; (3) reacting inulin with citric acid to obtain reactant N; (4) reacting reactant M with reactant N to obtain sol P; (5) dissolving the sol P in an organic solvent to obtain a spinning solution, and obtaining a fiber material through drawing and spinning. The organic solvent is selected from cyclohexanone, dimethylformamide, N,N-dimethylformamide, N,N-dimethylacetamide or tetrahydrofuran; the solid content of the spinning solution is 10 to 30%.

2. The method for preparing a fiber material for air purification according to claim 1, characterized in that: In step (1), the adsorbent is placed in an acidic solution for reaction at 25 to 50° C., and after the reaction is completed, the modified adsorbent is obtained by washing and drying. The adsorbent is at least one of aerogel, activated alumina, silica gel, and molecular sieves. The acidic solution is a trichloroacetic acid solution or a mellitic acid solution, and the mass fraction of the trichloroacetic acid solution or the mellitic acid solution is 0.1 to 5%. The mass ratio of the adsorbent to the acid in the acidic solution is 8 to 12:

1.

3. The method for preparing a fiber material for air purification according to claim 2, characterized in that: During the reaction, a polycarboxylic acid polyamine glutaraldehyde polymer is added, and the mass ratio of the polycarboxylic acid polyamine glutaraldehyde polymer to the adsorbent is 0.01-0.1:1; the polycarboxylic acid polyamine glutaraldehyde polymer is prepared by the following steps: adipic acid and butene glycol in a molar ratio of 1.0-1.2:1.0 are reacted at 160-180°C for 1-12h, then, after adding, the mixture is stirred evenly, and glutaraldehyde is added at 40-55°C and the reaction is continued for 1-8h to obtain the obtained product; the mass ratio of water to butene glycol is 10-20, and the molar ratio of butene glycol to glutaraldehyde is 1.0:1.0-1.

2.

4. The method for preparing a fiber material for air purification according to claim 1, characterized in that: In step (2), at 50-100° C., the modified adsorbent and tea polyphenols are reacted in an aqueous solution containing a catalyst system to obtain a reactant M, wherein the mass ratio of the modified adsorbent to the tea polyphenols is 1:0.5-5; the catalyst system comprises a hydrogen-type molecular sieve, a super absorbent resin and tannic acid; the mass ratio of the hydrogen-type molecular sieve, the super absorbent resin and tannic acid is 1:0.5-2:0.5-2, and the mass ratio of the hydrogen-type molecular sieve to the tea polyphenols is 0.01-0.1:

1.

5. The method for preparing a fiber material for air purification according to claim 4, characterized in that: The highly water-absorbent resin is polyacrylic acid resin, starch acrylate polymer, starch-acrylonitrile graft copolymer or acrylamide-acrylonitrile-acrylic acid terpolymer.

6. The method for preparing a fiber material for air purification according to claim 1, characterized in that: In step (3), inulin and citric acid are reacted in a mixed solution including a hydrazine sulfate solution and a sodium hydroxide solution at 50 to 100° C. to obtain reactant N; the mass ratio of the inulin to the citric acid is 1:5 to 10, the mass ratio of the hydrazine sulfate to the sodium hydroxide is 0.5 to 1:1, and the mass ratio of the citric acid to the mixed solution is 1:5 to 15.

7. The method for preparing a fiber material for air purification according to claim 1, characterized in that: In step (4), reactant M and reactant N are reacted in an aqueous solution comprising acetic acid and glacial acetic acid at 30-50° C. to obtain sol P, wherein the volume ratio of the acetic acid to the glacial acetic acid is 1:1; the mass fraction of the acetic acid is 0.1-5%, and the mass ratio of the reactant M to the reactant N is 1-3:7-9.

8. A fiber material for air purification, characterized in that: The fiber material is prepared by the method for preparing the fiber material for air purification as described in any one of claims 1 to 7.

9. Use of the fiber material for air purification according to claim 8 in the preparation of air purification materials, air filter materials, protective equipment or filter tips.

10. A method for making a cigarette filter using a fiber material for air purification as claimed in claim 8, characterized in that: The method comprises the following steps: at room temperature, 10-60 parts of fiber material, 5-15 parts of modified adsorbent, 5-20 parts of tea polyphenols, 5-20 parts of inulin, 1-10 parts of bacillus, 1-10 parts of streptomyces, 5-15 parts of soybean protein and 10-60 parts of water are mixed, and then the mixture is fed into an extruder, and the feeding section, melting section and puffing heating temperatures are controlled, and the cigarette filter tip is obtained after sufficient puffing and shaping.

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