CN112569906A - Preparation method of non-woven fabric with adsorption function - Google Patents

Preparation method of non-woven fabric with adsorption function Download PDF

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CN112569906A
CN112569906A CN202011324677.2A CN202011324677A CN112569906A CN 112569906 A CN112569906 A CN 112569906A CN 202011324677 A CN202011324677 A CN 202011324677A CN 112569906 A CN112569906 A CN 112569906A
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woven fabric
activated carbon
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ammonium chloride
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李磊
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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Abstract

The invention relates to the technical field of non-woven fabrics, and discloses a preparation method of a non-woven fabric with an adsorption function. Firstly, preparing chitosan-activated carbon composite powder; then adding polyvinyl acetate emulsion and lauryl sodium sulfate surfactant into deionized water, stirring and dissolving to obtain bonding impregnation liquid, and immersing the non-woven fabric into the bonding impregnation liquid to obtain an infiltrated non-woven fabric; and finally, horizontally placing the soaked non-woven fabric, spraying chitosan-activated carbon composite powder on the upper surface of the non-woven fabric, squeezing the non-woven fabric by using a compression roller, and then drying the non-woven fabric in an oven to obtain the chitosan-activated carbon composite powder. According to the invention, the chitosan-activated carbon composite powder is bonded on the surface of the non-woven fabric through the adhesive, the adhesive can not cause the blockage of micropores on the surface of the activated carbon, and the adsorption performance of the non-woven fabric on formaldehyde is further improved.

Description

Preparation method of non-woven fabric with adsorption function
Technical Field
The invention relates to the technical field of non-woven fabrics, in particular to a preparation method of a non-woven fabric with an adsorption function.
Background
The quality of indoor air can directly influence people's life and work, and from the perspective of energy saving, the degree of obturation improves among the modern building, and the imperfection of central air conditioning ventilation facility leads to indoor pollutant can't in time follow indoor discharge, is detained in indoor, causes the deterioration of indoor air quality. The degree of indoor air pollution is 2-3 times more severe than that of outdoor air pollution, and in some cases, can even be more than 100 times. At present, more than 300 pollutants can be detected indoors, and 68% of diseases of human bodies are related to the pollutants. Common pollutants in indoor air include formaldehyde, ammonia, benzene, Total Volatile Organic Compounds (TVOC), stone radioactivity, lead pollution, environmental smoke and the like. How to eliminate these volatile organic compounds and reduce the threat to human health has become a hot issue of research. The indoor air environment with excellent quality not only achieves proper hot and humid conditions, but also can provide natural and fresh air without adverse effects on body health for indoor personnel, so that the indoor personnel can live and work in a healthy and comfortable environment. The current treatment method for indoor air pollution comprises the following steps: adsorption, absorption, nanomaterial photocatalysis, and biological filtration, among which adsorption is a commonly used method. The adsorption method is to utilize the physical action between pollutant molecules and adsorption molecules to enrich the pollutant on the surface of the adsorbent to remove the pollutant. The adsorption method is one of indoor VOC treatment technologies which are widely applied at present. Common adsorbents consist of: activated carbon, activated carbon fiber, zeolite, molecular sieve, porous clay ore, activated alumina, silica gel and the like, wherein activated carbon, activated alumina containing potassium permanganate and composite activated carbon fiber are most commonly used.
Chinese patent publication No. CN107297199 discloses a material containing cellulose for purifying air in a vehicle and a preparation process thereof, which comprises the steps of mixing activated carbon, an antibacterial agent and a binder, adding water after mixing, stirring uniformly to obtain a mixed solution, soaking a framework non-woven fabric in the mixed solution, rolling the soaked framework non-woven fabric, then putting the framework non-woven fabric in a drying oven for drying, and compounding the framework non-woven fabric and a polypropylene air filter cloth through a heat seal process to obtain a filtering and adsorbing material; also, for example, chinese patent publication No. CN107261745 discloses a material for purifying air in a vehicle containing PVA and a preparation method thereof, which comprises mixing activated carbon particles, an antibacterial agent and a binder, adding water, stirring uniformly to obtain a mixed solution, uniformly coating the mixed solution on the surface of a non-woven fabric by a roll, and drying to prepare an activated carbon non-woven fabric.
Directly mix the active carbon that has adsorption performance and adhesive among the above-mentioned patent technical scheme, the adhesive adhesion can cause the micropore jam on active carbon surface on active carbon's surface, and then causes the adsorption performance decline of adsorption material.
Disclosure of Invention
The invention provides a preparation method of a non-woven fabric with an adsorption function, aiming at overcoming the technical problem that the adsorption performance of the non-woven fabric is reduced due to the fact that an adhesive is adhered to the surface of activated carbon to block activated carbon micropores. According to the invention, the chitosan-activated carbon composite powder is bonded on the surface of the non-woven fabric through the adhesive, the adhesive can not cause the blockage of micropores on the surface of the activated carbon, and the adsorption performance of the non-woven fabric on formaldehyde is further improved.
In order to achieve the purpose, the invention adopts the following technical scheme: a preparation method of non-woven fabric with adsorption function comprises the following steps:
s1, adding carboxymethyl chitosan and sodium bicarbonate into deionized water, stirring and dissolving to prepare a mixed solution, adding ethyl acetate, span 80 and sodium dodecyl sulfate into liquid paraffin, stirring and dispersing uniformly to obtain an oil phase solution, dropwise adding the mixed solution into the oil phase solution, heating to 40-50 ℃, stirring and reacting for 20-30min, then adding modified activated carbon powder, stirring and mixing uniformly, adjusting the pH value of a solution system to 9-10, adding glutaraldehyde, heating to 80-85 ℃, keeping the temperature and reacting for 1-3h, filtering, washing and drying to obtain chitosan-activated carbon composite powder;
s2, adding the polyvinyl acetate emulsion and the lauryl sodium sulfate surfactant into deionized water, stirring and dissolving to obtain bonding impregnation liquid, and immersing the non-woven fabric into the bonding impregnation liquid for 20-30min to obtain an infiltrated non-woven fabric;
s3, horizontally placing the soaked non-woven fabric, spraying chitosan-activated carbon composite powder on the upper surface of the non-woven fabric, squeezing the non-woven fabric by using a press roll, and then drying in an oven to obtain the chitosan-activated carbon composite non-woven fabric.
In the prior art, the method for preparing the adsorbing material by combining the non-woven fabric with the activated carbon comprises the steps of mixing the activated carbon and the binder to form a binding solution, and then soaking the non-woven fabric material into the binding solution to enable the activated carbon to be adhered to the surface of the non-woven fabric, but the finishing mode has a plurality of defects, and in the mixing process of the activated carbon and the binder, the binder is easy to coat on the surface of the activated carbon to cause micropore blockage on the surface of the activated carbon, so that the adsorption performance on formaldehyde is greatly reduced; on the other hand, the activated carbon is relatively dispersed in the binding solution, and the number of the activated carbon bound to the surface of the non-woven fabric is limited when the non-woven fabric is taken out after being soaked in the binding solution, so that the formaldehyde adsorption performance of the non-woven fabric material is further influenced. The invention aims to overcome the problems, and adopts a method that non-woven fabrics are firstly immersed into aqueous solution of a binder, so that the surface of the non-woven fabrics is coated with a viscose layer, then chitosan-activated carbon composite powder is sprayed on the surface of the non-woven fabrics, and the chitosan-activated carbon composite powder is tightly combined with the non-woven fabrics in a compression roller squeezing mode, so that the method can not cause the blockage of activated carbon micropores, and the surface of the non-woven fabrics can be combined with more adsorption particles compared with the prior art, thereby improving the formaldehyde adsorption performance of the non-woven fabrics.
Because the active carbon volume is less, carry out the squeeze rolling in-process to the non-woven fabrics through the compression roller, can extrude the inside of embedding non-woven fabrics surface adhesive layer with active carbon, lead to the effective adsorption area on active carbon surface to reduce, influence the adsorption effect of active carbon to formaldehyde. The invention uses chitosan-activated carbon composite powder to replace activated carbon powder, the chitosan-activated carbon composite powder is characterized in that chitosan microspheres are used as a carrier of activated carbon, the chitosan microspheres are subjected to thermal decomposition under the action of pore-forming agents of ethyl acetate and sodium bicarbonate to generate gas, the prepared chitosan microspheres have larger pore diameter structures, the activated carbon is deposited and combined on the surfaces and inside the pore diameters of the chitosan microspheres, so as to prepare the chitosan-activated carbon composite powder, the chitosan-activated carbon composite powder is embedded into the surface adhesive layer of the non-woven fabric in the extrusion rolling process of the non-woven fabric by a compression roller, so that the chitosan-activated carbon composite powder is combined on the surfaces of the non-woven fabric, and the activated carbon combined inside the large pore diameters of the chitosan microspheres cannot be embedded into the surface adhesive layer of the non-woven fabric, so as to improve the effective adsorption area of the activated carbon, thereby improving the formaldehyde adsorption effect of the non-woven fabric material; on the other hand, compared with the method of directly combining the activated carbon powder on the surface of the non-woven fabric by combining the chitosan-activated carbon composite powder on the surface of the non-woven fabric, more activated carbon powder can be combined on the surface of the non-woven fabric, and the adsorption performance of the non-woven fabric material on formaldehyde is further improved.
Preferably, the mass ratio of the carboxymethyl chitosan to the sodium bicarbonate in the step S1 is 1: 0.1-0.5.
Preferably, the volume ratio of the mixed solution to the oil phase solution in the step S1 is 1: 3-6.
Preferably, the addition amount of glutaraldehyde in step S1 is 4-8wt% of carboxymethyl chitosan.
Preferably, the drying temperature in the step S1 is 60 to 70 ℃.
Preferably, the mass percentage of the polyvinyl acetate emulsion in the adhesive impregnation liquid in the step S2 is 10-15%.
Preferably, the preparation method of the modified activated carbon powder comprises the following steps: adding epoxypropyl dodecyl diethyl ammonium chloride into deionized water, stirring and dissolving to prepare an epoxypropyl dodecyl diethyl ammonium chloride aqueous solution, heating in a water bath to 70-80 ℃, adding activated carbon into the epoxypropyl dodecyl diethyl ammonium chloride aqueous solution, then adding a tin tetrachloride catalyst, reacting for 1-3h under the stirring condition, filtering, washing and drying to obtain the modified activated carbon powder.
The method for preparing the chitosan-activated carbon composite powder adds the activated carbon powder in the preparation process of the chitosan microspheres, and the activated carbon powder and the chitosan microspheres have no good bonding performance, so that the number of the activated carbon loaded on the chitosan microspheres is reduced. Therefore, the invention further modifies the activated carbon, and epoxy groups on the molecules of the epoxypropyl dodecyl diethyl ammonium chloride and hydroxyl groups on the surface of the activated carbon are subjected to ring-opening reaction, so that the epoxypropyl dodecyl diethyl ammonium chloride is grafted on the surface of the activated carbon, the surface of the activated carbon is positively charged, and more activated carbon is combined with the chitosan microspheres under the action of electrostatic attraction due to the negative charge of the loaded carboxyl groups on the chitosan microspheres, so that the loading capacity of the chitosan microspheres on the activated carbon is improved, and the adsorption performance on formaldehyde is improved.
Preferably, the mass ratio of the activated carbon to the epoxypropyl dodecyl diethyl ammonium chloride is 1: 0.3-0.6.
Preferably, the addition amount of the tin tetrachloride catalyst is 3-6wt% of the epoxypropyldodecyl diethyl ammonium chloride.
Therefore, the invention has the following beneficial effects: 1) the binder in the non-woven fabric prepared by the invention can not cause the blockage of activated carbon micropores, and the adsorption performance to formaldehyde is improved; 2) compared with the prior art, the non-woven fabric of the invention can combine more activated carbon adsorption particles, thereby further improving the formaldehyde adsorption performance.
Drawings
FIG. 1 is a bar graph comparing the formaldehyde adsorption rates of the nonwoven materials of the examples of the present invention and the comparative examples.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples. In the present invention, unless otherwise specified, raw materials, equipment, and the like used are commercially available or commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified. The non-woven fabric used in the specific embodiment is hydrophilic polypropylene non-woven fabric, 80g/m2Manufactured by Dongguan friend reputation industries, Inc.; the polyvinyl acetate emulsion has solid content of 30-40%, viscosity of 6000pa.s and pH value of 4-6.
Example 1
The preparation method of the modified activated carbon powder comprises the following steps:
adding epoxypropyl dodecyl diethyl ammonium chloride into deionized water, stirring and dissolving to prepare an epoxypropyl dodecyl diethyl ammonium chloride aqueous solution with the mass concentration of 3%, heating in a water bath to 80 ℃, adding activated carbon into the epoxypropyl dodecyl diethyl ammonium chloride aqueous solution, wherein the mass ratio of the activated carbon to the epoxypropyl dodecyl diethyl ammonium chloride is 1:0.5, then adding a tin tetrachloride catalyst, wherein the addition amount of the tin tetrachloride catalyst is 5 wt% of the epoxypropyl dodecyl diethyl ammonium chloride, reacting for 2.5h under the stirring condition, and filtering, washing and drying to obtain the modified activated carbon powder.
The preparation method of the non-woven fabric with the adsorption function comprises the following steps:
s1, adding carboxymethyl chitosan and sodium bicarbonate into deionized water, stirring and dissolving to prepare a mixed solution, wherein the mass ratio of the carboxymethyl chitosan to the sodium bicarbonate is 1:0.4, the mass concentration of the carboxymethyl chitosan in the mixed solution is 5%, adding ethyl acetate, span 80 and sodium dodecyl sulfate into liquid paraffin, the mass ratio of the ethyl acetate, the span 80, the sodium dodecyl sulfate and the liquid paraffin is 1:3:0.5:30, stirring and dispersing uniformly to obtain an oil phase solution, dripping the mixed solution into the oil phase solution, wherein the volume ratio of the mixed solution to the oil phase solution is 1:6, heating to 40 ℃, stirring and reacting for 25min, then adding modified activated carbon powder, the mass ratio of the modified activated carbon powder to the carboxymethyl chitosan is 1:3, stirring and mixing uniformly, adjusting the pH of the solution system to 10, adding glutaraldehyde, the addition amount of the glutaraldehyde is 7 wt% of the carboxymethyl chitosan, heating to 85 ℃, reacting for 2.5h under heat preservation, filtering, washing, and then drying in an oven at 70 ℃ for 2h to obtain chitosan-activated carbon composite powder;
s2, adding polyvinyl acetate emulsion and a sodium dodecyl sulfate surfactant into deionized water, stirring and dissolving to obtain a bonding impregnation liquid, wherein the mass concentration percentage of the polyvinyl acetate emulsion in the bonding impregnation liquid is 13%, the mass concentration percentage of the sodium dodecyl sulfate in the bonding impregnation liquid is 1.5%, and soaking the non-woven fabric in the bonding impregnation liquid for 25min to obtain a soaked non-woven fabric;
s3, horizontally placing the soaked non-woven fabric, and spraying chitosan-activated carbon composite powder on the upper surface of the non-woven fabric, wherein the spraying amount is 50g/m2And squeezing the non-woven fabric by using a compression roller, and drying the non-woven fabric in an oven at 60 ℃ for 3 hours to obtain the non-woven fabric.
Example 2
The preparation method of the modified activated carbon powder comprises the following steps:
adding epoxypropyl dodecyl diethyl ammonium chloride into deionized water, stirring and dissolving to prepare an epoxypropyl dodecyl diethyl ammonium chloride aqueous solution with the mass concentration of 3%, heating in a water bath to 70 ℃, adding activated carbon into the epoxypropyl dodecyl diethyl ammonium chloride aqueous solution, wherein the mass ratio of the activated carbon to the epoxypropyl dodecyl diethyl ammonium chloride is 1:0.4, then adding a tin tetrachloride catalyst, wherein the addition amount of the tin tetrachloride catalyst is 4 wt% of the epoxypropyl dodecyl diethyl ammonium chloride, reacting for 1.5h under the stirring condition, and filtering, washing and drying to obtain the modified activated carbon powder.
The preparation method of the non-woven fabric with the adsorption function comprises the following steps:
s1, adding carboxymethyl chitosan and sodium bicarbonate into deionized water, stirring and dissolving to prepare a mixed solution, wherein the mass ratio of the carboxymethyl chitosan to the sodium bicarbonate is 1:0.2, the mass concentration of the carboxymethyl chitosan in the mixed solution is 5%, adding ethyl acetate, span 80 and sodium dodecyl sulfate into liquid paraffin, the mass ratio of the ethyl acetate, the span 80, the sodium dodecyl sulfate and the liquid paraffin is 1:3:0.5:30, stirring and dispersing uniformly to obtain an oil phase solution, dripping the mixed solution into the oil phase solution, wherein the volume ratio of the mixed solution to the oil phase solution is 1:3, heating to 50 ℃, stirring and reacting for 22min, then adding modified activated carbon powder, the mass ratio of the modified activated carbon powder to the carboxymethyl chitosan is 1:3, stirring and mixing uniformly, adjusting the pH of the solution system to 9, adding glutaraldehyde, the addition amount of the glutaraldehyde is 5 wt% of the carboxymethyl chitosan, heating to 80 ℃, reacting for 1.5h while keeping the temperature, filtering, washing, and then drying in an oven at 60 ℃ for 2h to obtain chitosan-activated carbon composite powder;
s2, adding polyvinyl acetate emulsion and a sodium dodecyl sulfate surfactant into deionized water, stirring and dissolving to obtain a bonding impregnation liquid, wherein the mass concentration percentage of the polyvinyl acetate emulsion in the bonding impregnation liquid is 12%, the mass concentration percentage of the sodium dodecyl sulfate in the bonding impregnation liquid is 1.5%, and soaking the non-woven fabric in the bonding impregnation liquid for 23min to obtain a soaked non-woven fabric;
s3, horizontally placing the soaked non-woven fabric, and spraying chitosan-activated carbon composite powder on the upper surface of the non-woven fabric, wherein the spraying amount is 50g/m2And squeezing the non-woven fabric by using a compression roller, and drying the non-woven fabric in an oven at 60 ℃ for 3 hours to obtain the non-woven fabric.
Example 3
The preparation method of the modified activated carbon powder comprises the following steps:
adding epoxypropyl dodecyl diethyl ammonium chloride into deionized water, stirring and dissolving to prepare an epoxypropyl dodecyl diethyl ammonium chloride aqueous solution with the mass concentration of 3%, heating in a water bath to 75 ℃, adding activated carbon into the epoxypropyl dodecyl diethyl ammonium chloride aqueous solution, wherein the mass ratio of the activated carbon to the epoxypropyl dodecyl diethyl ammonium chloride is 1:0.6, then adding a tin tetrachloride catalyst, wherein the addition amount of the tin tetrachloride catalyst is 6wt% of the epoxypropyl dodecyl diethyl ammonium chloride, reacting for 3 hours under the stirring condition, and filtering, washing and drying to obtain the modified activated carbon powder.
The preparation method of the non-woven fabric with the adsorption function comprises the following steps:
s1, adding carboxymethyl chitosan and sodium bicarbonate into deionized water, stirring and dissolving to prepare a mixed solution, wherein the mass ratio of the carboxymethyl chitosan to the sodium bicarbonate is 1:0.5, the mass concentration percentage of the carboxymethyl chitosan to the mixed solution is 5%, adding ethyl acetate, span 80 and sodium dodecyl sulfate into liquid paraffin, the mass ratio of the ethyl acetate, the span 80, the sodium dodecyl sulfate and the liquid paraffin is 1:3:0.5:30, stirring and dispersing uniformly to obtain an oil phase solution, dripping the mixed solution into the oil phase solution, wherein the volume ratio of the mixed solution to the oil phase solution is 1:5, heating to 45 ℃, stirring and reacting for 30min, then adding modified activated carbon powder, the mass ratio of the modified activated carbon powder to the carboxymethyl chitosan is 1:3, stirring and mixing uniformly, adjusting the pH of the solution system to 9.5, adding glutaraldehyde, the addition amount of the glutaraldehyde is 8wt% of the carboxymethyl chitosan, heating to 83 ℃, reacting for 3 hours under the condition of heat preservation, filtering, washing, and then drying in a drying oven at 65 ℃ for 2 hours to obtain chitosan-activated carbon composite powder;
s2, adding polyvinyl acetate emulsion and lauryl sodium sulfate surfactant into deionized water, stirring and dissolving to obtain bonding impregnation liquid, wherein the mass concentration percentage of the polyvinyl acetate emulsion in the bonding impregnation liquid is 15%, the mass concentration percentage of the lauryl sodium sulfate is 1.5%, and soaking the non-woven fabric in the bonding impregnation liquid for 30min to obtain soaked non-woven fabric;
s3, soakingThe non-woven fabric is placed horizontally, and chitosan-activated carbon composite powder is sprayed on the upper surface of the non-woven fabric, wherein the spraying amount is 50g/m2And squeezing the non-woven fabric by using a compression roller, and drying the non-woven fabric in an oven at 60 ℃ for 3 hours to obtain the non-woven fabric.
Example 4
The preparation method of the modified activated carbon powder comprises the following steps:
adding epoxypropyl dodecyl diethyl ammonium chloride into deionized water, stirring and dissolving to prepare an epoxypropyl dodecyl diethyl ammonium chloride aqueous solution with the mass concentration of 3%, heating in a water bath to 75 ℃, adding activated carbon into the epoxypropyl dodecyl diethyl ammonium chloride aqueous solution, wherein the mass ratio of the activated carbon to the epoxypropyl dodecyl diethyl ammonium chloride is 1:0.3, then adding a tin tetrachloride catalyst, wherein the addition amount of the tin tetrachloride catalyst is 3 wt% of the epoxypropyl dodecyl diethyl ammonium chloride, reacting for 1h under the stirring condition, and filtering, washing and drying to obtain the modified activated carbon powder.
The preparation method of the non-woven fabric with the adsorption function comprises the following steps:
s1, adding carboxymethyl chitosan and sodium bicarbonate into deionized water, stirring and dissolving to prepare a mixed solution, wherein the mass ratio of the carboxymethyl chitosan to the sodium bicarbonate is 1:0.1, the mass concentration percentage of the carboxymethyl chitosan to the mixed solution is 5%, adding ethyl acetate, span 80 and sodium dodecyl sulfate into liquid paraffin, the mass ratio of the ethyl acetate, the span 80, the sodium dodecyl sulfate and the liquid paraffin is 1:3:0.5:30, stirring and dispersing uniformly to obtain an oil phase solution, dripping the mixed solution into the oil phase solution, wherein the volume ratio of the mixed solution to the oil phase solution is 1:5, heating to 45 ℃, stirring and reacting for 20min, then adding modified activated carbon powder, the mass ratio of the modified activated carbon powder to the carboxymethyl chitosan is 1:3, stirring and mixing uniformly, adjusting the pH of the solution system to 9.5, adding glutaraldehyde, the addition amount of the glutaraldehyde is 4 wt% of the carboxymethyl chitosan, heating to 83 ℃, reacting for 1h under heat preservation, filtering, washing, and then drying in a drying oven at 65 ℃ for 2h to obtain chitosan-activated carbon composite powder;
s2, adding polyvinyl acetate emulsion and lauryl sodium sulfate surfactant into deionized water, stirring and dissolving to obtain bonding impregnation liquid, wherein the mass concentration percentage of the polyvinyl acetate emulsion in the bonding impregnation liquid is 10%, the mass concentration percentage of the lauryl sodium sulfate is 1.5%, and soaking the non-woven fabric in the bonding impregnation liquid for 20min to obtain soaked non-woven fabric;
s3, horizontally placing the soaked non-woven fabric, and spraying chitosan-activated carbon composite powder on the upper surface of the non-woven fabric, wherein the spraying amount is 50g/m2And squeezing the non-woven fabric by using a compression roller, and drying the non-woven fabric in an oven at 60 ℃ for 3 hours to obtain the non-woven fabric.
Comparative example 1
Comparative example 1 is different from example 1 in a method for preparing a nonwoven fabric comprising the steps of:
s1, adding polyvinyl acetate emulsion and a sodium dodecyl sulfate surfactant into deionized water, stirring and dissolving to obtain a bonding impregnation liquid, wherein the mass concentration percentage of the polyvinyl acetate emulsion in the bonding impregnation liquid is 13%, the mass concentration percentage of the sodium dodecyl sulfate in the bonding impregnation liquid is 1.5%, and soaking the non-woven fabric in the bonding impregnation liquid for 25min to obtain a soaked non-woven fabric;
s2, horizontally placing the soaked non-woven fabric, and spraying activated carbon powder on the upper surface of the non-woven fabric, wherein the spraying amount is 50g/m2And squeezing the non-woven fabric by using a compression roller, and drying the non-woven fabric in an oven at 60 ℃ for 3 hours to obtain the non-woven fabric.
Comparative example 2
Comparative example 2 is different from example 1 in that the activated carbon powder is not modified.
Detecting the adsorption performance of the non-woven fabric material:
the method detects the formaldehyde adsorption performance of the non-woven fabric in the sealed space by a chemical method, thereby indirectly evaluating the adsorption performance of the non-woven fabric material. Cutting nonwoven fabric into 5cm × 5cm, drying in oven at 50 deg.C for 2 hr, placing the nonwoven fabric in sealed glass dish, injecting formaldehyde gas into the glass dish, wherein the initial concentration of injected formaldehyde is about T0Putting the mixture into a constant temperature incubator to keep the temperature at 25 ℃ for 24h, and then testing the mixture in a glass dishConcentration of Formaldehyde is T1Calculating the absorption rate w of formaldehyde1Each group of samples was tested 3 times and the average was calculated. The formaldehyde absorption was calculated as follows: w is a1＝(T0-T1)/T0X is 100%; wherein, w1Represents the formaldehyde absorption (%), T0Denotes the initial concentration of formaldehyde in the glass dish, T1The concentration of formaldehyde gas in the glass dish after 24h is indicated.
Figure BDA0002793935520000071
Tests show that the adsorption performance of the non-woven fabric material of the embodiment on formaldehyde is obviously superior to that of the non-woven fabric adsorption material of the comparative example and the conventional commercially available non-woven fabric adsorption material. The adsorption performance of the non-woven fabric material on formaldehyde is superior to that of comparative example 1, and the evidence proves that the carboxymethyl chitosan microsphere loaded activated carbon is used for preparing the chitosan-activated carbon composite powder, the composite powder is combined on the surface of the non-woven fabric, and the activated carbon is directly combined on the surface of the non-woven fabric, so that the non-woven fabric material has a better adsorption effect on formaldehyde. The adsorption performance of the non-woven fabric material on formaldehyde is better than that of the non-woven fabric material in the comparative example 2, and the active carbon powder after modification treatment is proved to be incapable of further improving the adsorption performance on formaldehyde.
The raw materials and equipment used in the invention are all common raw materials and equipment in the field if no special description is given; the methods used in the present invention are conventional in the art unless otherwise specified. The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical solution of the present invention, and any simple modification, change and equivalent replacement made on the above embodiment according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (9)

1. A preparation method of non-woven fabric with adsorption function is characterized by comprising the following steps:
s1, adding carboxymethyl chitosan and sodium bicarbonate into deionized water, stirring and dissolving to prepare a mixed solution, adding ethyl acetate, span 80 and sodium dodecyl sulfate into liquid paraffin, stirring and dispersing uniformly to obtain an oil phase solution, dropwise adding the mixed solution into the oil phase solution, heating to 40-50 ℃, stirring and reacting for 20-30min, then adding modified activated carbon powder, stirring and mixing uniformly, adjusting the pH value of a solution system to 9-10, adding glutaraldehyde, heating to 80-85 ℃, keeping the temperature and reacting for 1-3h, filtering, washing and drying to obtain chitosan-activated carbon composite powder;
s2, adding the polyvinyl acetate emulsion and the lauryl sodium sulfate surfactant into deionized water, stirring and dissolving to obtain bonding impregnation liquid, and immersing the non-woven fabric into the bonding impregnation liquid for 20-30min to obtain an infiltrated non-woven fabric;
s3, horizontally placing the soaked non-woven fabric, spraying chitosan-activated carbon composite powder on the upper surface of the non-woven fabric, squeezing the non-woven fabric by using a press roll, and then drying in an oven to obtain the chitosan-activated carbon composite non-woven fabric.
2. The method of claim 1, wherein the mass ratio of carboxymethyl chitosan to sodium bicarbonate in step S1 is 1: 0.1-0.5.
3. The method of claim 1, wherein the volume ratio of the mixed solution to the oil phase solution in step S1 is 1: 3-6.
4. The method of claim 1, wherein the glutaraldehyde is added in an amount of 4-8wt% based on the carboxymethyl chitosan in the step S1.
5. The method of claim 1, wherein the drying temperature in the step S1 is 60-70 ℃.
6. The method of claim 1, wherein the polyvinyl acetate emulsion in the adhesive impregnation liquid in step S2 is 10-15% by mass.
7. The method for preparing the non-woven fabric with the adsorption function according to claim 1, wherein the method for preparing the modified activated carbon powder comprises the following steps: adding epoxypropyl dodecyl diethyl ammonium chloride into deionized water, stirring and dissolving to prepare an epoxypropyl dodecyl diethyl ammonium chloride aqueous solution, heating in a water bath to 70-80 ℃, adding activated carbon into the epoxypropyl dodecyl diethyl ammonium chloride aqueous solution, then adding a tin tetrachloride catalyst, reacting for 1-3h under the stirring condition, filtering, washing and drying to obtain the modified activated carbon powder.
8. The method for preparing the non-woven fabric with the adsorption function according to claim 7, wherein the mass ratio of the activated carbon to the epoxypropyl dodecyl diethyl ammonium chloride is 1: 0.3-0.6.
9. The method for preparing a non-woven fabric with an adsorption function according to claim 7, wherein the addition amount of the tin tetrachloride catalyst is 3-6wt% of the epoxypropyldodecyldiethylammonium chloride.
CN202011324677.2A 2020-11-23 2020-11-23 Preparation method of non-woven fabric with adsorption function Withdrawn CN112569906A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113863010A (en) * 2021-11-04 2021-12-31 苏州工业园区安泽汶环保技术有限公司 Preparation method and application of non-woven fabric composite material with formaldehyde adsorption function
CN114347575A (en) * 2021-12-14 2022-04-15 江苏奥特隆新材料有限公司 Production process and equipment of medical activated carbon non-woven fabric

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113863010A (en) * 2021-11-04 2021-12-31 苏州工业园区安泽汶环保技术有限公司 Preparation method and application of non-woven fabric composite material with formaldehyde adsorption function
CN114347575A (en) * 2021-12-14 2022-04-15 江苏奥特隆新材料有限公司 Production process and equipment of medical activated carbon non-woven fabric

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