CN113058374A - Formaldehyde removal filter screen and preparation method and application thereof - Google Patents
Formaldehyde removal filter screen and preparation method and application thereof Download PDFInfo
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- CN113058374A CN113058374A CN202110316913.4A CN202110316913A CN113058374A CN 113058374 A CN113058374 A CN 113058374A CN 202110316913 A CN202110316913 A CN 202110316913A CN 113058374 A CN113058374 A CN 113058374A
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
- B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
- B01D46/525—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material which comprises flutes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention discloses a formaldehyde removal filter screen and a preparation method and application thereof. The formaldehyde removing filter screen comprises: the filter body is wavy, and the material of the filter body comprises non-woven fabrics of which the fiber surfaces are coated with graft copolymers of organic polymers and amino acids; and a frame disposed at the periphery of the filter body. When air flows through the filter screen, the surface of the fiber in the non-woven fabric in the filter screen is coated with the graft copolymer of the organic polymer and the amino acid, and the active amino group in the graft copolymer reacts with formaldehyde to generate harmless hydroxymethyl derivatives, so that formaldehyde pollutants in the air are fixed, and the aim of purifying the air is fulfilled.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to a formaldehyde removal filter screen and a preparation method and application thereof.
Background
In the indoor space of people working and living, the air not only contains a large amount of particles, such as dust, smoke dust, powder and the like, but also contains a large amount of gaseous volatile organic pollutants, such as nitrogen oxides, ozone, formaldehyde, toluene, xylene and the like. Among them, formaldehyde is a main pollutant of indoor air pollution caused by decoration and furniture, has the characteristics of slow release and persistent pollution, is determined as a carcinogenic and teratogenic substance by the world health organization, and can cause nasopharyngeal carcinoma and leukemia. According to survey, most of indoor formaldehyde concentration exceeds the sanitary standard, and particularly, the formaldehyde concentration exceeding the standard is more obvious in a newly decorated room. Therefore, people pay more attention to the indoor formaldehyde pollution condition. In addition to improving air quality by means of natural or mechanical ventilation, the use of indoor air purification products is also a common approach. At present, the formaldehyde-removing air filter in the market mainly comprises a filter screen filled with activated carbon particles, a filter screen sandwiched with carbon cloth and a photocatalyst filter screen.
The filter screen filled with the active carbon particles mostly adopts columnar active carbon particles, and harmful gases such as formaldehyde and the like are adsorbed by utilizing the porous structure and a large amount of surface area of the active carbon, but the filter screen has the defects of low purification efficiency, large resistance, fast adsorption saturation, easy desorption and the like. However, under the action of a certain external force, such as during loading, transportation, and carrying, the filter screen filled with activated carbon particles is easily damaged to generate powder pollution such as activated carbon powder, and the filter screen does not have the function of removing particulate matters, and if the filter screen is stacked with a pleated filter core of particulate matters for use, the thickness of the composite filter screen is greatly increased, and the structural design of the product is affected. In addition, activated carbon is easily affected with damp, breeding bacteria and generating peculiar smell.
The carbon-sandwiched cloth filter screen is prepared by spraying fine activated carbon particles between a particulate removing filter material (such as polypropylene melt-blown non-woven fabric) and a support material (such as PET non-woven fabric) and then carrying out processes of pleating, glue injection and the like, but has the defects of large resistance, poor formaldehyde adsorption, easy desorption, secondary pollution generation and the like. In addition, the main problems of carbon cloth clamping are that the gram weight needs to be increased when the adsorption efficiency and the service life are improved, the resistance is large, the expansion area of the melt-blown cloth is small due to the large thickness, the dust holding capacity is reduced, and the like.
The photocatalyst filter screen mostly adopts nanometer titanium dioxide as a catalyst, when no ultraviolet light is irradiated, formaldehyde is not thoroughly decomposed, the purification efficiency is low, and if the photocatalyst filter screen is matched with an ultraviolet lamp for use, ozone pollution is easily generated, and secondary damage is caused to a human body.
In order to further improve the formaldehyde gas removal efficiency of the filter screen, researchers load transition metal oxides such as manganese oxide on a carrier material to form a formaldehyde removal filter screen. CN106345409A, CN106423147A load the manganese oxide in active carbon or clay material respectively, and pack these active carbon or clay granule that load the manganese oxide in honeycomb frame and form and remove the formaldehyde filter screen, however, the windage of this kind of packing particulate matter type filter screen is big, and is general to the removal effect of formaldehyde, does not possess and removes the particulate matter function, if fold the use with the particulate matter filter core with this filter screen, can greatly increase the thickness of compound filter screen, influence the structural design of product, in addition, the active carbon easily wets, easily reduces manganese oxide activity and breeds the bacterium. CN103480267A adopts an in-situ reduction method to synthesize manganese oxide in one step, and the manganese oxide is loaded on fiber material base materials such as filter cotton, but the bonding force between the manganese oxide and the base materials is weak, the loading capacity is low, and the waste of effective active substances is serious. In addition, in the loading process, the manganese oxide is easy to agglomerate and agglomerate, so that the catalytic decomposition activity of the manganese oxide on formaldehyde is reduced, and meanwhile, the formaldehyde removal activity of the manganese oxide is obviously reduced in a high-humidity environment.
Therefore, there is a need to develop an improved filter screen for removing formaldehyde, which can improve the efficiency of removing formaldehyde gas, and can be used in high temperature and high humidity environment, avoid the problems of deactivation, migration and falling off of formaldehyde removing active substances in high humidity environment, and prolong the service life of the filter screen.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the formaldehyde removing filter screen which has high formaldehyde gas removing efficiency and long service life.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a formaldehyde removing filter screen, which comprises:
the filter body is wavy, and the material of the filter body comprises non-woven fabrics of which the fiber surfaces are coated with graft copolymers of organic polymers and amino acids;
and a frame disposed at the periphery of the filter body.
The fiber surface of the non-woven fabric in the filter screen is coated with the graft copolymer of organic polymer and amino acid, and when air flows through the filter screen, the active amino group in the graft copolymer reacts with formaldehyde in the air to generate harmless hydroxymethyl derivatives, so that formaldehyde pollutants in the air are fixed, and the aim of refreshing the air is fulfilled.
In some embodiments, the chemical structure of the graft copolymer of an organic polymer and an amino acid is represented by formula (I):
in the formula (I), R is H or
m is an integer of 0 or more.
In some embodiments, the graft copolymer of an organic polymer and an amino acid is at least one of a graft copolymer of polyvinyl alcohol and glycine, and a graft copolymer of polyvinyl alcohol and alanine.
In some embodiments, the non-woven fabric is one of a polyester non-woven fabric, a polypropylene non-woven fabric and a nylon non-woven fabric, preferably a polyester non-woven fabric, and the gram weight of the polyester non-woven fabric is 30-120 g/m2. The terylene nonwoven fabric has high air permeability and low windThe characteristics of resistance, high tensile strength and good stiffness can not influence the characteristics of the original filtering bottom layer, such as wind resistance, dust adsorption performance and service life, and simultaneously, the novel filter has the characteristics of wind pressure resistance and difficult deformation.
In some embodiments, the material of the filtering main body further includes electret melt-blown nonwoven fabric.
In some embodiments, the frame is made of at least one of paper, plastic, metal, and spun lace cotton.
In a second aspect, the present invention further provides a preparation method of the formaldehyde removal filter screen described in the above embodiment, where the preparation method includes the following steps:
1) preparing a non-woven fabric with the fiber surface coated with a graft copolymer of an organic polymer and amino acid: dipping the non-woven fabric in a solution containing a graft copolymer of an organic polymer and an amino acid at the temperature of 80-100 ℃ for 1-5 min, and drying to obtain the non-woven fabric with the fiber surface coated with the graft copolymer of the organic polymer and the amino acid;
2) preparing the non-woven fabric prepared in the step 1) into a wavy filter main body;
3) and cutting the filtering main body according to the required size, and bonding the frame to the periphery of the filtering main body.
In some embodiments, the solution containing the graft copolymer of an organic polymer and an amino acid comprises the following components in percentage by weight:
1-20 percent of graft copolymer of organic polymer and amino acid
0 to 0.2 percent of sodium chloride
The balance of water.
In some embodiments, in the step 2), the corrugated filter body is formed by pleating the non-woven fabric obtained in the step 1). The non-woven fabrics are pleated to form a plurality of pleats to obtain a wavy filtering main body, so that the contact area of air and the filter screen is larger when the air flows through the filter screen, and the filtering and absorbing capacity and formaldehyde purifying capacity of the filter screen on impurities in the air are enhanced. Meanwhile, the contact area of the air and the filter screen is large, so that the impurities adsorbed on the filter screen in unit area are less, the purification service life of the filter screen is indirectly prolonged, and the frequency of cleaning or replacing the filter screen is reduced.
In some embodiments, in the step 2), the wavy filter body is formed by pleating a filter cloth obtained by compounding the non-woven fabric obtained in the step 1) with an electret melt-blown non-woven fabric. The non-woven fabric with the fiber surface coated with the graft copolymer of the organic polymer and the amino acid is compounded with the electret melt-blown non-woven fabric, and the electrostatic adsorption principle can be utilized to effectively filter and adsorb particulate matters in the air, so that the air purification effect of the filter screen is enhanced.
In some embodiments, the method for compounding the nonwoven fabric obtained in step 1) with the electret melt-blown nonwoven fabric is one of hot melt adhesive compounding, pressure-sensitive adhesive compounding and ultrasonic compounding.
In a third aspect, the present invention further provides an air treatment device, which includes a housing, wherein an air inlet is disposed on the housing, and the air inlet is provided with the formaldehyde removal filter screen according to the above embodiment.
Air fully contacts with the formaldehyde removal filter screen after passing through the air inlet, the graft copolymer of the organic polymer and the amino acid on the filter main body captures and chemically bonds formaldehyde molecules in the air through active amino, and the air forms clean air after passing through the filter screen. The air treatment device has high formaldehyde purification efficiency and long service life of the filter screen, can be used in a high-temperature and high-humidity environment, and avoids the problems of inactivation, migration and falling of formaldehyde removal active substances in a high-humidity environment.
In some embodiments, the air treatment device is an air purifier or an air conditioning indoor unit.
Compared with the prior art, the invention has the beneficial effects that:
(1) the formaldehyde-removing active substance amino acid is fixed on the organic polymer chain segment in a chemical bonding mode, is not easy to migrate and fall off, and is beneficial to prolonging the service life of the formaldehyde-removing filter screen and widening the application scene of the formaldehyde-removing filter screen;
(2) the graft copolymer of the organic polymer and the amino acid in the filter screen has the characteristics of moisture resistance, high temperature resistance and strong adhesive force, and can be used in a high-temperature and high-humidity environment;
(3) the graft copolymer of the organic polymer and the amino acid of the filter screen captures and chemically bonds formaldehyde molecules in the air through active amino groups, so that secondary pollution is avoided;
(4) the graft copolymer of the organic polymer and the amino acid is coated on the fiber surface of the non-woven fabric, can fully contact with the air, and effectively improves the removal capability of the filter screen on formaldehyde in the air;
(5) the non-woven fabric coated with the graft copolymer of the organic polymer and the amino acid on the surface has small thickness, low wind resistance and excellent flexibility, is convenient to manufacture filters in various shapes, and is suitable for various air treatment devices.
Drawings
FIG. 1 is a top view of the formaldehyde removal screen of example 1;
FIG. 2 is a cross-sectional view of the formaldehyde removal screen of FIG. 1 taken along section line A-A;
FIG. 3 is a schematic cross-sectional view of a nonwoven fabric fiber surface-coated with an amino acid graft-modified organic polymer;
FIG. 4 is a top view of the formaldehyde removal screen of example 3;
FIG. 5 is a cross-sectional view of the formaldehyde removal screen of FIG. 4 taken along section line A-A;
wherein, 1-a formaldehyde removal filter screen; 2-a filter body; 3-a frame; 4-electret melt-blown nonwoven fabric; 5-non-woven fabric with the surface of the fiber coated with graft copolymer of organic polymer and amino acid; 6-a fibrous matrix; 7-graft copolymers of organic polymers and amino acids.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It will be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a formaldehyde removal filter screen, which comprises:
the filter body is wavy, and the material of the filter body comprises non-woven fabrics of which the fiber surfaces are coated with graft copolymers of organic polymers and amino acids;
and the frame is arranged on the periphery of the filtering main body and used for fixing the filtering main body.
When air flows through the filter screen, the surface of the fiber in the non-woven fabric in the filter screen is coated with the graft copolymer of the organic polymer and the amino acid, and the active amino group in the graft copolymer reacts with formaldehyde to generate harmless hydroxymethyl derivatives, so that formaldehyde pollutants in the air are fixed, and the aim of purifying the air is fulfilled.
In some embodiments, the amino acid in the graft copolymer of an organic polymer and an amino acid includes, but is not limited to, at least one of glycine, lysine, alanine, and cysteine.
In some embodiments, the chemical structure of the graft copolymer of an organic polymer and an amino acid is represented by formula (I):
in the formula (I), R is H or
m is an integer of 0 or more.
In some embodiments, the graft copolymer of the organic polymer and the amino acid is at least one of a graft copolymer of polyvinyl alcohol and glycine and a graft copolymer of polyvinyl alcohol and alanine, which is more favorable for improving the removal capability of the filter screen on formaldehyde in the air compared with other kinds of graft copolymers.
In some embodiments, the non-woven fabric is one of a polyester non-woven fabric, a polypropylene non-woven fabric and a nylon non-woven fabric, preferably a polyester non-woven fabric, and the gram weight of the polyester non-woven fabric is 30-120 g/m2. Compared with other types of non-woven fabrics, the terylene non-woven fabric has the characteristics of high air permeability, low wind resistance, high tensile strength and good stiffness, and the characteristics of the original filtering bottom layer, such as wind resistance, can not be influencedDust adsorption performance, long service life, wind pressure resistance and difficult deformation.
In some embodiments, the material of the filtering main body further includes electret melt-blown nonwoven fabric, which can effectively filter and adsorb particles in the air.
In some embodiments, the frame is made of at least one of paper, plastic, metal, and spun lace cotton.
The invention also provides a preparation method of the formaldehyde removal filter screen, which comprises the following steps:
1) preparing a non-woven fabric with the fiber surface coated with a graft copolymer of an organic polymer and amino acid: dipping the non-woven fabric in a solution containing a graft copolymer of an organic polymer and an amino acid at the temperature of 80-100 ℃ for 1-5 min, and drying to obtain the non-woven fabric with the fiber surface coated with the graft copolymer of the organic polymer and the amino acid;
2) preparing the non-woven fabric prepared in the step 1) into a wavy filter main body;
3) and cutting the filtering main body according to the required size, and bonding the frame to the periphery of the filtering main body.
In some embodiments, the solution containing the graft copolymer of an organic polymer and an amino acid comprises the following components in percentage by weight:
1-20 percent of graft copolymer of organic polymer and amino acid
0 to 0.2 percent of sodium chloride
The balance of water.
By adding an appropriate amount of sodium chloride, the viscosity of a solution containing a graft copolymer of an organic polymer and an amino acid can be reduced.
In some embodiments, in order to ensure that the nonwoven fabric is sufficiently wetted, the graft copolymer of the organic polymer and the amino acid can be sufficiently coated on the fiber surface of the nonwoven fabric, and in the step 1), the weight ratio of the nonwoven fabric to the solution containing the graft copolymer of the organic polymer and the amino acid is 1: 1-1: 50.
In some embodiments, in the step 2), the corrugated filter body is formed by pleating the non-woven fabric obtained in the step 1). The non-woven fabrics forms a plurality of folds through pleating processing, forms wavy filtration main part for the area of contact of air and filter screen is great when this filter screen of flowing through, thereby reinforcing filter screen to impurity's in the air filtration adsorption efficiency and formaldehyde purification ability. Meanwhile, the contact area of the air and the filter screen is large, so that the impurities adsorbed on the filter screen in unit area are less, the purification service life of the filter screen is indirectly prolonged, and the frequency of cleaning or replacing the filter screen is reduced.
In some embodiments, in the step 2), the wavy filter body is formed by pleating a filter cloth obtained by compounding the non-woven fabric obtained in the step 1) with an electret melt-blown non-woven fabric. With the compounding of non-woven fabrics and electret melt-blown non-woven fabrics, can utilize the electrostatic adsorption principle, carry out effective filtration, absorption to the particulate matter in the air, be favorable to strengthening the purifying effect of filter screen to the air.
In some embodiments, the electret meltblown nonwoven fabric is selected from one of F7, F8, F9, H10, H11, H12, and H13, preferably H11, while ensuring a low wind resistance of the screen while effectively filtering particulates from the air.
In some embodiments, the method for compounding the nonwoven fabric obtained in step 1) with the electret melt-blown nonwoven fabric is one of hot melt adhesive compounding, pressure-sensitive adhesive compounding and ultrasonic compounding.
The invention also provides an air treatment device which comprises a shell, wherein the shell is provided with an air inlet, and the air inlet is provided with the formaldehyde removal filter screen.
The air passes through the air inlet of the air treatment device and then fully contacts with the formaldehyde removal filter screen, the graft copolymer of the organic polymer and the amino acid on the filter main body captures and chemically bonds formaldehyde molecules in the air through active amino, and the air forms clean air after passing through the filter screen. The air treatment device has high formaldehyde purification efficiency and long service life of the filter screen, can be used in a high-temperature and high-humidity environment, and avoids the problems of inactivation, migration and falling of formaldehyde removal active substances in a high-humidity environment.
In some embodiments, the air treatment device is an air purifier or an air conditioning indoor unit.
In order to more clearly and specifically describe a formaldehyde removal filter screen and a preparation method thereof provided in the embodiments of the present invention, the following description will be made with reference to specific embodiments.
The following examples and comparative examples are illustrative of the starting materials used:
the graft copolymer of polyvinyl alcohol and glycine is prepared by self, and the preparation method comprises the following steps: heating and dissolving polyvinyl alcohol (PVA) in dimethyl sulfoxide (DMSO), then dropwise adding concentrated sulfuric acid to adjust the pH value to 3-4, then adding glycine powder, reacting for 16 hours at 110-120 ℃, and finally filtering, recrystallizing and purifying to obtain the graft copolymer of the polyvinyl alcohol and the glycine.
The graft copolymer of polyvinyl alcohol and alanine is prepared by self, and the preparation method comprises the following steps: heating and dissolving PVA in DMSO, then dropwise adding concentrated sulfuric acid to adjust the pH value to 3-4, then adding alanine powder, reacting for 16 hours at 110-120 ℃, and finally filtering, recrystallizing and purifying to obtain the graft copolymer of polyvinyl alcohol and alanine.
Example 1
The formaldehyde removing filter screen 1 of the present embodiment is shown in fig. 1-3, and comprises:
the filter body 2 is wavy, and the material of the filter body comprises an electret melt-blown non-woven fabric 4 and a non-woven fabric 5 of which the fiber surface is coated with a graft copolymer of an organic polymer and amino acid; the fiber in the non-woven fabric 5 with the fiber surface coated with the graft copolymer of the organic polymer and the amino acid comprises a fiber matrix 6 and the graft copolymer 7 of the organic polymer and the amino acid from inside to outside;
and the frame 3 is arranged on the periphery of the filtering main body 2 and is fixedly bonded through hot melt adhesive.
The preparation method of the formaldehyde removal filter screen comprises the following steps:
1) preparing a non-woven fabric with the surface of the fiber coated with a graft copolymer of an organic polymer and glycine:
the gram weight is 40g/m2Of non-woven arrangement of polyester fibres at 90 DEG CSoaking in a mixed solution containing a graft copolymer of an organic polymer and glycine for 5min, and drying by a hot air type dryer to obtain the non-woven fabric with the surface of the fiber coated with the graft copolymer of polyvinyl alcohol and glycine;
wherein the weight ratio of the polyester non-woven fabric to the mixed solution is 1: 30;
the mixed solution comprises the following components in percentage by weight: 8 percent of graft copolymer of polyvinyl alcohol and glycine, 0.05 percent of sodium chloride and 91.95 percent of water;
2) preparing a wavy filter body:
compounding the non-woven fabric prepared in the step 1) with an H11-grade electret melt-blown non-woven fabric through ultrasonic waves to obtain filter cloth, and pleating the filter cloth to prepare a wavy filter main body;
3) the filter body is cut according to the required size, and the frame is bonded to the periphery of the filter body through hot melt adhesive.
Example 2
The structure and the preparation method of the filter screen for removing formaldehyde in this embodiment are substantially the same as those in embodiment 1, except that the preparation method of the filter screen for removing formaldehyde in this embodiment comprises the following steps:
1) preparing a non-woven fabric with the surface of the fiber coated with the graft copolymer of the organic polymer and the alanine:
the gram weight is 40g/m2The polyester non-woven fabric is soaked in a mixed solution containing a graft copolymer of an organic polymer and alanine at the temperature of 95 ℃ for 5min, and is dried by a hot air type dryer to obtain the non-woven fabric of which the surface of the fiber is coated with the graft copolymer of polyvinyl alcohol and alanine;
wherein the weight ratio of the polyester non-woven fabric to the mixed solution is 1: 30;
the mixed solution comprises the following components in percentage by weight: 8 percent of graft copolymer of polyvinyl alcohol and alanine, 0.05 percent of sodium chloride and 91.95 percent of water;
2) preparing a wavy filter body:
compounding the non-woven fabric prepared in the step 1) with an H11-grade electret melt-blown non-woven fabric through ultrasonic waves to obtain filter cloth, and pleating the filter cloth to prepare a wavy filter main body;
3) the filter body is cut according to the required size, and the frame is bonded to the periphery of the filter body through hot melt adhesive.
Example 3
The formaldehyde removing filter screen 1 of the present embodiment is shown in fig. 4-5, and comprises:
the filter body 2 is wavy, and the material of the filter body comprises non-woven fabrics 5 of which the fiber surfaces are coated with graft copolymers of organic polymers and amino acids; the fiber in the non-woven fabric 5 with the fiber surface coated with the graft copolymer of the organic polymer and the amino acid is shown in figure 2 and comprises a fiber matrix 6 and a graft copolymer 7 of the organic polymer and the amino acid from inside to outside;
and the frame 3 is arranged on the periphery of the filtering main body 2 and is fixedly bonded through hot melt adhesive.
The preparation method of the formaldehyde removal filter screen 1 comprises the following steps:
1) preparing a non-woven fabric with the surface of the fiber coated with a graft copolymer of an organic polymer and glycine:
the gram weight is 40g/m2The polyester non-woven fabric is soaked in a mixed solution containing a graft copolymer of organic polymers and glycine at the temperature of 90 ℃ for 5min, and is dried by a hot air type dryer to obtain the non-woven fabric with the surface of the fiber coated with the graft copolymer of polyvinyl alcohol and glycine;
wherein the weight ratio of the polyester non-woven fabric to the mixed solution is 1: 30;
the mixed solution comprises the following components in percentage by weight: 8 percent of graft copolymer of polyvinyl alcohol and glycine, 0.05 percent of sodium chloride and 91.95 percent of water;
2) preparing a wavy filter body:
pleating the non-woven fabric prepared in the step 1) to prepare a wavy filter main body;
3) the filter body is cut according to the required size, and the frame is bonded to the periphery of the filter body through hot melt adhesive.
Example 4
The structure and the manufacturing method of the filter screen for removing formaldehyde in this embodiment are substantially the same as those in embodiment 3, except that in step 1) of the manufacturing method of the filter screen for removing formaldehyde in this embodiment,
the gram weight is 40g/m2The polyester non-woven fabric is soaked in a mixed solution containing a graft copolymer of organic polymers and glycine at the temperature of 90 ℃ for 5min, and is dried by a hot air type dryer to obtain the non-woven fabric with the surface of the fiber coated with the graft copolymer of polyvinyl alcohol and glycine;
wherein the weight ratio of the polyester non-woven fabric to the mixed solution is 1: 30;
the mixed solution comprises the following components in percentage by weight: 15 percent of graft copolymer of polyvinyl alcohol and glycine, 0.1 percent of sodium chloride and 84.5 percent of water.
Example 5
The structure and the manufacturing method of the filter screen for removing formaldehyde in this embodiment are substantially the same as those of embodiment 3, except that in step 1) of the manufacturing method of the filter screen for removing formaldehyde in this embodiment,
the gram weight is 40g/m2The polyester non-woven fabric is soaked in a mixed solution containing a graft copolymer of organic polymers and amino acids at 90 ℃ for 5min, and is dried by a hot air type dryer to obtain the non-woven fabric of which the surface of the fiber is coated with the graft copolymer of polyvinyl alcohol and amino acids;
wherein the weight ratio of the polyester non-woven fabric to the mixed solution is 1: 30;
the mixed solution comprises the following components in percentage by weight: 10% of a graft copolymer of polyvinyl alcohol and alanine, 10% of a graft copolymer of polyvinyl alcohol and glycine, 0.2% of sodium chloride and 79.8% of water;
2) preparing a wavy filter body:
pleating the non-woven fabric prepared in the step 1) to prepare a wavy filter main body;
3) the filter body is cut according to the required size, and the frame is bonded to the periphery of the filter body through hot melt adhesive.
Comparative example 1
The structure and the preparation method of the formaldehyde removal filter screen of the comparative example are substantially the same as those of example 3, except that in step 1) of the preparation method of the formaldehyde removal filter screen of the comparative example, the mixed solution comprises the following components in percentage by weight: 8% of glycine, 0.05% of sodium chloride and 91.95% of water.
Comparative example 2
The structure and the preparation method of the formaldehyde removal filter screen of the comparative example are substantially the same as those of example 3, except that in step 1) of the preparation method of the formaldehyde removal filter screen of the comparative example, the mixed solution comprises the following components in percentage by weight: 4% of glycine, 4% of polyvinyl alcohol, 0.05% of sodium chloride and 91.95% of water.
The formaldehyde removing filter screens of the above examples and comparative examples were subjected to performance tests according to the following methods:
(1) air purification capability: assembling a formaldehyde removal filter screen near an air inlet of an air purifier or an indoor unit of an air conditioner, and testing the clean air quantity of formaldehyde and the clean air quantity of particulate matters according to GB/T18801-2015;
(2) attenuation of formaldehyde removal performance: and (3) testing the attenuation result of the formaldehyde removal performance of the filter screen after the filter screen for removing formaldehyde is treated for 12 hours at the temperature of 60 ℃ in the environment of 90% RH.
The results of the performance test of the formaldehyde removal screens of the examples and comparative examples are shown in table 1.
TABLE 1
From the above results, it is understood that the filter screen of the present invention has high efficiency of purifying formaldehyde in the air, and after the filter screen is treated in a high temperature and high humidity environment, the filter screen has reduced formaldehyde removal performance and a long service life. When the filtering main body of the filter screen adopts the non-woven fabric and the electret melt-blown non-woven fabric of which the fiber surfaces are coated with the graft copolymer of the organic polymer and the amino acid, the filter screen can effectively filter and adsorb the particles in the air by utilizing the electrostatic adsorption principle, thereby enhancing the purifying effect of the filter screen on the air particles.
From the results of example 3 and comparative examples 1-2, it is known that the aldehyde-removing active substance amino acid is fixed on the organic polymer chain segment by chemical bonding to form a graft copolymer, the active amino group in the graft copolymer can capture and chemically bond formaldehyde molecules in the air, the formaldehyde purification efficiency is high, and the formaldehyde-removing filter screen can be used in high-temperature and high-humidity environment, and is beneficial to prolonging the service life of the formaldehyde-removing filter screen.
From the results of examples 3 to 5, it is clear that the type and concentration of the graft copolymer of the organic polymer and the amino acid are preferable, and the formaldehyde purification efficiency of the filter can be adjusted.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The utility model provides a remove formaldehyde filter screen which characterized in that includes:
the filter body is wavy, and the material of the filter body comprises non-woven fabrics of which the fiber surfaces are coated with graft copolymers of organic polymers and amino acids;
and a frame disposed at the periphery of the filter body.
2. The formaldehyde removing filter screen according to claim 1, wherein the chemical structural formula of the graft copolymer of the organic polymer and the amino acid is shown as formula (I):
in the formula (I), R is H or
m is an integer of 0 or more;
the graft copolymer of the organic polymer and the amino acid is preferably at least one of a graft copolymer of polyvinyl alcohol and glycine and a graft copolymer of polyvinyl alcohol and alanine.
3. The formaldehyde removal screen of claim 1, having at least one of the following characteristics (a) - (c):
(a) the non-woven fabric is one of polyester non-woven fabric, polypropylene non-woven fabric and nylon non-woven fabric, preferably polyester non-woven fabric, and the gram weight of the polyester non-woven fabric is 30-120 g/m2；
(b) The material of the filtering main body also comprises electret melt-blown non-woven fabric;
(c) the frame is made of at least one of paper, plastic, metal and spunlace cotton.
4. The method for preparing the formaldehyde removal filter screen according to any one of claims 1 to 3, which is characterized by comprising the following steps:
1) preparing a non-woven fabric with the fiber surface coated with a graft copolymer of an organic polymer and amino acid: dipping the non-woven fabric in a solution containing a graft copolymer of an organic polymer and an amino acid at the temperature of 80-100 ℃ for 1-5 min, and drying to obtain the non-woven fabric with the fiber surface coated with the graft copolymer of the organic polymer and the amino acid;
2) preparing the non-woven fabric prepared in the step 1) into a wavy filter main body;
3) and cutting the filtering main body according to the required size, and bonding the frame to the periphery of the filtering main body.
5. The method for preparing the formaldehyde-removing filter screen according to claim 4, wherein the solution containing the graft copolymer of the organic polymer and the amino acid comprises the following components in percentage by weight:
1-20 percent of graft copolymer of organic polymer and amino acid
0 to 0.2 percent of sodium chloride
The balance of water.
6. The method for preparing the formaldehyde removal filter screen according to claim 4, wherein in the step 2), the wavy filter main body is formed by pleating the non-woven fabric obtained in the step 1).
7. The method for preparing the formaldehyde removal filter screen according to claim 4, wherein the wavy filter body is formed by pleating a filter cloth obtained by compounding the non-woven fabric obtained in the step 1) with an electret melt-blown non-woven fabric.
8. The method for preparing the formaldehyde removal filter screen according to claim 7, wherein the compounding method of the non-woven fabric obtained in the step 1) and the electret melt-blown non-woven fabric is one of hot melt adhesive compounding, pressure-sensitive adhesive compounding and ultrasonic compounding.
9. An air treatment device, which is characterized by comprising a shell, wherein an air inlet is arranged on the shell, and the formaldehyde removal filter screen of any one of claims 1 to 3 is arranged at the air inlet.
10. The air treatment device of claim 9, wherein the air treatment device is an air purifier or an air conditioning indoor unit.
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