CN113499636B - Formaldehyde-removing color-changing framework and preparation method thereof - Google Patents

Formaldehyde-removing color-changing framework and preparation method thereof Download PDF

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CN113499636B
CN113499636B CN202110734231.5A CN202110734231A CN113499636B CN 113499636 B CN113499636 B CN 113499636B CN 202110734231 A CN202110734231 A CN 202110734231A CN 113499636 B CN113499636 B CN 113499636B
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changing
formaldehyde
framework
mass fraction
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CN113499636A (en
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尤健明
汪颜开
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Tongxiang Jianmin Filter Materials Co ltd
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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
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B01D39/04—Organic material, e.g. cellulose, cotton
    • 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
    • B01D53/02—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 by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • 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
    • B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
    • B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
    • B01J20/0288—Halides of compounds other than those provided for in B01J20/046
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • 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
    • B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • 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
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • 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
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/16—Alumino-silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
    • B01J20/28011—Other properties, e.g. density, crush strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28023—Fibres or filaments
    • 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
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
    • 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
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0464—Impregnants
    • 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
    • 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
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1275—Stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s

Abstract

A formaldehyde-removing color-changing framework and a preparation method thereof belong to the technical field of indoor air purification. The color-changing adsorption material consists of a framework filtering material and a color-changing adsorption material, wherein the framework filtering material is a fiber material prepared by mixing one or more of modified polypropylene, modified polyethylene, polyester, polyamide and polyurethane; the color-changing adsorption material is prepared from a color-changing reagent and an adsorption material by an impregnation method. According to the formaldehyde-removing color-changing framework and the preparation method thereof, the color-changing framework has the effect of removing indoor formaldehyde, the highest formaldehyde removal rate can reach 89%, the use condition of the material can be seen, the color-changing framework is convenient to replace, and the color-changing framework can be compounded with melt-blown, electrostatic cotton, a PTFE (polytetrafluoroethylene) film, glass fibers and empty filter paper, is non-toxic and harmless, is safe and environment-friendly, and is convenient for large-scale production.

Description

Formaldehyde-removing color-changing framework and preparation method thereof
The invention belongs to the technical field of indoor air purification, and particularly relates to a formaldehyde-removing color-changing framework and a preparation method thereof.
Background
Formaldehyde is one of common gases causing indoor environmental pollution and is a class I carcinogen. The excessive concentration of formaldehyde causes nausea, vomiting and other discomforts in human body, and the long-term contact with formaldehyde is considered to be one of the causes of leukemia. In the latest air purifier standard GB/T18801-2015, formaldehyde is determined as one of the tested pollutant gases, and the indoor formaldehyde concentration needs to be below 0.1 ppm.
The existing formaldehyde-removing color-changing material, namely the color-changing adsorbing material of patent application No. 202010642823, can repeatedly and continuously adsorb formaldehyde and the preparation method thereof, adopts alcohol ammonia and deionized water to prepare a formaldehyde reactant, and reduces the PH of the reaction to enable a color developing agent to develop color to prepare the adsorption property sponge. The adsorption material obtained by the preparation method is difficult to judge the service life of the filter material due to repeated color change, and the sponge is thick and difficult to be used after being compounded with other filter materials.
The purple pellets for removing formaldehyde on the market can be changed from purple to yellow in the using process, and the formaldehyde is removed by utilizing the strong oxidizing property of potassium permanganate. Potassium permanganate has strong oxidizing property, and in the use process of the filter material, the potassium permanganate can not contact with the glue with reducing property, so that the application range is greatly reduced.
The formaldehyde and color change removal material is difficult to be compounded with solid pollutant removal materials such as melt-blown, electrostatic cotton and PTFE stretching films, so that the application range of the material is limited.
Most of the existing commonly used composite materials for adsorbing formaldehyde remove formaldehyde by adopting a mode of mixing activated carbon which is bonded by glue between two layers of non-woven fabrics, and the use condition of the composite materials cannot be visually seen.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to design and provide the formaldehyde-removing color-changing framework and the technical scheme of the preparation method thereof, the color-changing framework has the effect of removing indoor formaldehyde, the formaldehyde removal rate can reach 89% at most, the use condition of the material can be seen, the replacement is convenient, and the color-changing framework can be compounded with melt-blown, electrostatic cotton, a PTFE (polytetrafluoroethylene) film, glass fibers and hollow filter paper, is nontoxic and harmless, is safe and environment-friendly, and is convenient for large-scale production.
The formaldehyde-removing color-changing framework is characterized in that: the color-changing adsorption material is composed of a framework filtering material and a color-changing adsorption material, wherein the framework filtering material is a fiber material prepared by mixing one or more of modified polypropylene, modified polyethylene, polyester and polyamide; the color-changing adsorption material is prepared from a color-changing reagent and an adsorption material by a dipping method; the color-changing reagent is a mixed solution of ammonium salt and acetylacetone with the pH of 4-6.8, the ammonium salt is one or a mixture of more than one of ammonium acetate, ammonium chloride and ammonium oxalate, and the reagent for regulating the pH is one or two of phosphoric acid and acetic acid, wherein the mass fraction of the ammonium salt is 20-45%, and the mass fraction of the acetylacetone is 0.2-2%; the adsorbing material is one or a mixture of more than one of porous alumina, porous silica, titanium dioxide and molecular sieves.
The formaldehyde-removing color-changing framework is characterized in that the framework filtering material and the color-changing adsorbing material are combined in a hot rolling or thermal bonding mode.
The formaldehyde-removing color-changing framework is characterized in that the pH value of a color-changing reagent is 4.5-6.5, and preferably the pH value is 5-6.
The formaldehyde-removing color-changing framework is characterized in that the mass fraction of ammonium salt is 25-40%, preferably 30-35%; the mass fraction of acetylacetone is 0.2-2%, preferably 1-1.2%.
The formaldehyde-removing color-changing framework is characterized in that: the gram weight of the framework filter material is 40-150g/m 2 The tensile strength is more than 50N/cm in MD direction, more than 45N/cm in CD direction, and the air permeability is 1800-5000L/m 2 .s。
The formaldehyde-removing color-changing framework is characterized in that: the gram weight of the framework filter material is 40-150g/m 2 Preferably a grammage of 70-90g/m 2 (ii) a Air permeability of 2500-3500L/m 2 .s。
The preparation method of the formaldehyde-removing color-changing framework is characterized by comprising the following steps:
1) Firstly adding ammonium salt into deionized water according to a certain proportion, stirring, adding acetylacetone after complete dissolution, and finally adjusting the pH value to 4-6.5, wherein the mass fraction of the ammonium salt is 20-45%, and the mass fraction of the acetylacetone is 0.2-2%;
2) Mixing and soaking the prepared solution and an adsorbing material for 0.5-5 h, filtering, and drying at 50-120 ℃ to form a color-changing adsorbing material;
3) The framework filtering material and the color-changing adsorbing material are combined in a hot rolling or heat bonding mode to prepare the color-changing adsorbing material.
The preparation method of the formaldehyde-removing color-changing framework is characterized in that in the step 3): mixing 40-150g/m 2 The framework filtering material and the color-changing adsorbing material are thermally bonded through a non-woven hot rolling mill, a powder scattering device is arranged at the front end of the hot rolling mill, the color-changing adsorbing material and hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 5-10% of the total weight, the hot melt adhesive powder is uniformly scattered on the framework filtering material in a powder scattering mode, then the framework filtering material and the hot melt adhesive powder are hot-rolled through a hot rolling roll, the temperature of the hot rolling mill is controlled to be 120-220 ℃, the pressure of the roll is adjusted to be 40-120N/mm, and then the final product is obtained through natural cooling at room temperature.
The preparation method of the formaldehyde-removing color-changing framework is characterized in that in the step 3): the color-changing adsorption material is fully mixed with the hot melt adhesive powder, wherein the hot melt adhesive powder accounts for 6-9% of the total weight, and preferably accounts for 7-8% of the total weight.
The preparation method of the formaldehyde-removing color-changing framework is characterized in that in the step 3): the temperature of the hot rolling mill is controlled at 140-200 ℃, preferably 160-170 ℃; the pressure of the rolls is adjusted to 50-100N/mm, preferably 60-80N/mm.
The acetylacetone in the formaldehyde-removing color-changing framework can react with formaldehyde to generate a stable compound, and the reaction formula is as follows:
Figure 850216DEST_PATH_IMAGE002
the formaldehyde-removing color-changing framework material and the production method thereof have the following beneficial effects:
1. the formaldehyde-removing color-changing framework has the effect of removing indoor formaldehyde, can change from white to yellow in the using process, enables a user to see the using condition of the material, and ensures timely replacement.
2. 100cm according to the invention 2 Under 32LPM, the formaldehyde-removing color-changing framework material has a removal rate of over 90% in 1 h.
3. The formaldehyde-removing color-changing framework comprises a formaldehyde-removing color-changing adsorption material and a framework filtering material, the formaldehyde-removing color-changing adsorption material and the framework filtering material are combined together in a hot rolling or thermal bonding mode, the used area and the gram weight are easy to adjust, the framework can be folded, and the manufacturing of a filtering device is convenient.
4. The formaldehyde-removing color-changing framework can be compounded with melt-blown, electrostatic cotton, a PTFE (polytetrafluoroethylene) film, glass fibers and hollow filter paper, and the preparation process is non-toxic and harmless, safe and environment-friendly, and is convenient for large-scale production.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following described embodiments are exemplary, are intended to be illustrative of the present invention, and are not to be construed as limiting the invention.
Example 1:
adding ammonium chloride into deionized water according to a certain proportion, stirring, adding acetylacetone after completely dissolving, and adjusting the pH value to 4 by using phosphoric acid to form a mixed solution, wherein the mass fraction of the ammonium chloride is 20%, and the mass fraction of the acetylacetone is 0.2%. And mixing and soaking the mixed solution and the porous alumina powder for 0.5h, and then drying at 50 ℃.
The dried alumina powder and hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 5 percent of the total weight, the powder spreading device uniformly spreads the mixture on the polyester framework material, and the gram weight of the polyester framework material is 40g/m 2 Tensile strength of 51N/cm in MD direction, 47N/cm in CD direction, and air permeability of 5000L/m 2 S, passing through a hot rolling roller, adjusting the hot rolling temperature to 220 ℃, adjusting the pressure of the roller to 40N/mm, and then cooling to obtain the formaldehyde-removing color-changing framework material with the gram weight of 47g/m 2 。
Example 2:
adding ammonium chloride into deionized water according to a certain proportion, stirring, adding acetylacetone after completely dissolving, and adjusting the pH value to 5.5 by using phosphoric acid to form a mixed solution, wherein the mass fraction of the ammonium chloride is 30%, and the mass fraction of the acetylacetone is 1%. Mixing the mixed solution with alumina powder, soaking for 1 hr, and drying at 90 deg.C.
The dried alumina powder and the hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 7 percent of the total weight, the mixture is uniformly sprinkled on a polyester framework material by a dusting device, and the gram weight of the polyester framework material is 60g/m 2 Tensile strength of 65N/cm in MD direction, 55N/cm in CD direction, and air permeability of 4000L/m 2 S, passing through a hot rolling roller, adjusting the hot rolling temperature to 180 ℃, adjusting the pressure of the roller to 70N/mm, and then cooling to obtain the formaldehyde-removing color-changing framework material with the gram weight of 75g/m 2 。
Example 3:
adding ammonium acetate into deionized water according to a certain proportion, stirring, adding acetylacetone after completely dissolving, and adjusting the pH value to 6.5 by using acetic acid to form a mixed solution, wherein the mass fraction of the ammonium acetate is 45%, and the mass fraction of the acetylacetone is 2%. Mixing the mixed solution with alumina powder, soaking for 5 hr, and drying at 120 deg.C.
The dried alumina powder and hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 10 percent of the total weight, the mixture is uniformly sprinkled on a polyester framework material by a dusting device, and the gram weight of the polyester framework material is 150g/m 2 The tensile strength in the MD direction is 118N/cm, the CD direction is 98N/cm, and the air permeability is 1800L/m 2 S, passing through a hot rolling roller, adjusting the hot rolling temperature to 180 ℃, adjusting the pressure of the roller to 120N/mm, and then naturally cooling to obtain the formaldehyde-removing color-changing framework material with the gram weight of 208g/m 2 。
Example 4:
adding ammonium acetate into deionized water according to a certain proportion, stirring, adding acetylacetone after completely dissolving, and adjusting the pH value to 6 by using acetic acid to form a mixed solution, wherein the mass fraction of the ammonium acetate is 30%, and the mass fraction of the acetylacetone is 1.2%. Mixing the mixed solution with titanium dioxide powder, soaking for 2 hr, and drying at 80 deg.C.
The dried titanium dioxide powder and hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 7 percent of the total weight, the powder scattering device uniformly scatters the mixture on the modified polypropylene framework material, and the gram weight of the modified polypropylene framework material is 90g/m 2 The tensile strength in the MD direction was 87N/cm, the CD direction was 75N/cm, and the air permeability was 3400L/m 2 S, passing through a hot rolling roller, adjusting the hot rolling temperature to 140 ℃, adjusting the pressure of the roller to 80N/mm, and then cooling to obtain the formaldehyde-removing color-changing framework material with the gram weight of 108g/m 2 。
Example 5:
adding ammonium acetate into deionized water according to a certain proportion, stirring, adding acetylacetone after completely dissolving, and adjusting the pH value to 6 by using phosphoric acid to form a mixed solution, wherein the mass fraction of the ammonium acetate is 35%, and the mass fraction of the acetylacetone is 2%. Mixing and soaking the mixed solution and titanium dioxide powder for 2h, and then drying at 120 ℃.
The dried porous silica powder and hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 10 percent of the total weight, and the mixture is uniformly sprinkled on a dusting deviceOn the modified polypropylene skeleton material, the gram weight of the modified polypropylene skeleton material is 90g/m 2 The tensile strength in the MD direction was 87N/cm, the CD direction was 75N/cm, and the air permeability was 3400L/m 2 S, passing through a hot rolling roller, adjusting the hot rolling temperature to 180 ℃, adjusting the pressure of the roller to 80N/mm, and then cooling to obtain the formaldehyde-removing color-changing framework material with the gram weight of 109g/m 2 。
Example 6:
adding ammonium chloride into deionized water according to a certain proportion, stirring, adding acetylacetone after completely dissolving, and adjusting the pH value to 6 by using acetic acid to form a mixed solution, wherein the mass fraction of the ammonium chloride is 35%, and the mass fraction of the acetylacetone is 2%. Mixing the mixed solution with titanium dioxide powder, soaking for 5 hr, and drying at 50 deg.C.
The dried titanium dioxide powder and hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 10 percent of the total weight, the mixture is uniformly sprinkled on the polyamide framework material by a dusting device, and the gram weight of the polyamide framework material is 120g/m 2 Tensile strength of 90N/cm in MD direction, 81N/cm in CD direction, and air permeability of 2900L/m 2 S, passing through a hot rolling roller, adjusting the hot rolling temperature to 180 ℃, adjusting the pressure of the roller to 80N/mm, and then cooling to obtain the formaldehyde-removing color-changing framework material with the gram weight of 141g/m 2 。
Example 7:
adding ammonium acetate into deionized water according to a certain proportion, stirring, adding acetylacetone after completely dissolving, and adjusting the pH value to 6 by using acetic acid to form a mixed solution, wherein the mass fraction of the ammonium acetate is 35%, and the mass fraction of the acetylacetone is 1.2%. Mixing and soaking the mixed solution and ZSM-5 molecular sieve powder for 2 hours, and then drying at 90 ℃.
The dried ZSM-5 molecular sieve powder and hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 8 percent of the total weight, the powder scattering device uniformly scatters the mixture on the modified polyethylene framework material, and the gram weight of the modified polyethylene framework material is 90g/m 2 Tensile strength of 75N/cm in MD direction, 67N/cm in CD direction, and air permeability of 3200L/m 2 S, passing through hot rolling roller at 120 deg.C, adjusting pressure of the roller to 80N/mm, and cooling to obtain the bone with formaldehyde removed and color changedFrame material with a grammage of 112g/m 2 。
Comparative example 1
The alumina powder and the hot melt adhesive powder are fully mixed, the hot melt adhesive powder accounts for 7 percent of the total weight, the powder scattering device uniformly scatters the mixture on the polyester framework material, and the gram weight of the polyester framework material is 60g/m 2 Tensile strength of 65N/cm in MD direction, 55N/cm in CD direction, and air permeability of 4000L/m 2 S, passing through a hot rolling roller, adjusting the hot rolling temperature to 180 ℃ and the pressure of the roller to 70N/mm, and then cooling to obtain a framework material with the gram weight of 71g/m 2 。
The advantageous effects of the present invention are further illustrated by the same test data below, see table 1.
Figure DEST_PATH_IMAGE004
Table 1 the results show that: the adsorbing material can enhance the formaldehyde removal performance after being impregnated with the color-changing reagent; the loading capacity of the color-changing adsorbing material on the framework filtering material can be improved by increasing the pressure of the hot rolling rod; the more the loading capacity of the color-changing adsorbing material loaded on the framework filtering material is, the stronger the formaldehyde removing capability is.
The formaldehyde removal rate test method comprises the following steps: at 1m 3 Testing with simulator in warehouse, and testing the length of 100cm 2 The color-changing framework material for removing formaldehyde is arranged in a sealing bag and is placed on a simulator, a micro-sample injector of 50 mu l is used for absorbing a proper amount of formaldehyde solution, the formaldehyde solution is dripped into a crucible through an external needle tube, and a fan and a heating crucible switch are turned on; after the formaldehyde solution is evaporated to dryness, closing a heating crucible switch, stirring by a fan until the concentration of formaldehyde does not rise any more, reading the gas concentration in the cabin by a monitor, and carrying out the topdressing on the gas concentration as the initial concentration (0 h/min) of formaldehyde, wherein the initial concentration is 1 +/-0.2 mg/m; after sampling, taking out the sample from the self-sealing bag, placing the sample in the middle of a test chamber, and timing; sampling points are taken, the sampling interval time is 5min, and the testing time is 1h in total;
the formaldehyde removal rate = [ (initial concentration of formaldehyde in the cabin-concentration of formaldehyde in the cabin at a certain time) ÷ initial concentration of formaldehyde in the cabin ] × 100%.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims (10)

1. The formaldehyde-removing color-changing framework is characterized in that: the color-changing adsorption material consists of a framework filtering material and a color-changing adsorption material, wherein the framework filtering material is a fiber material prepared by mixing one or more of modified polypropylene, modified polyethylene, polyester and polyamide; the color-changing adsorption material is prepared from a color-changing reagent and an adsorption material by a dipping method; the color-changing reagent is a mixed solution of ammonium salt and acetylacetone with the pH of 4-6.8, the ammonium salt is one or a mixture of more than one of ammonium acetate, ammonium chloride and ammonium oxalate, and the reagent for regulating the pH is one or two of phosphoric acid and acetic acid, wherein the mass fraction of the ammonium salt is 20-45%, and the mass fraction of the acetylacetone is 0.2-2%; the adsorption material is one or a mixture of more than one of porous alumina, porous silica, titanium dioxide and a molecular sieve;
the gram weight of the framework filter material is 40-150g/m 2 The tensile strength is more than 50N/cm in MD direction, more than 45N/cm in CD direction, and the air permeability is 1800-5000L/m 2 .s；
The preparation method comprises the following steps:
1) Adding ammonium salt into deionized water according to a certain proportion, stirring, adding acetylacetone after completely dissolving, and finally adjusting the pH value to 4-6.5, wherein the mass fraction of the ammonium salt is 20-45%, and the mass fraction of the acetylacetone is 0.2-2%;
2) Mixing and soaking the prepared solution and an adsorbing material for 0.5-5 h, filtering, and drying at 50-120 ℃ to form a color-changing adsorbing material;
3) The framework filtering material and the color-changing adsorbing material are prepared by hot rolling: 40-150g/m 2 The framework filtering material and the color-changing adsorbing material are thermally bonded through a non-woven hot rolling mill, the front end of the hot rolling mill is provided with a powder scattering device for thermally melting the color-changing adsorbing material and the color-changing adsorbing materialAfter the rubber powder is fully mixed, the hot melt rubber powder accounts for 5-10% of the total weight, is uniformly scattered on the framework filter material in a powder scattering mode, and then is subjected to hot rolling by a hot rolling roll, the temperature of the hot rolling mill is controlled to be 120-220 ℃, the pressure of the roll is adjusted to be 40-120N/mm, and then the final product is obtained after natural cooling at room temperature.
2. The formaldehyde-scavenging color-changing scaffold of claim 1, wherein the pH of the color-changing agent is from 4.5 to 6.5.
3. The formaldehyde-scavenging color-changing scaffold according to claim 1, wherein the pH of the color-changing agent is 5 to 6.
4. The formaldehyde-removing color-changing skeleton as claimed in claim 1, wherein the mass fraction of ammonium salt is 25-40%, and the mass fraction of acetylacetone is 0.2-2%.
5. The formaldehyde-removing color-changing skeleton as claimed in claim 1, wherein the mass fraction of ammonium salt is 30-35%, and the mass fraction of acetylacetone is 1-1.2%.
6. The formaldehyde-removing color-changing skeleton as claimed in claim 1, wherein: air permeability of 2500-3500L/m 2 .s。
7. The formaldehyde-removing color-changing skeleton according to claim 1, wherein: the gram weight of the framework filter material is 70-90g/m 2 。
8. The formaldehyde-removing color-changing skeleton as claimed in claim 1, wherein in step 3): the color-changing adsorption material is fully mixed with the hot melt adhesive powder, and the hot melt adhesive powder accounts for 6-9% of the total weight.
9. The formaldehyde-removing color-changing skeleton as claimed in claim 1, wherein in step 3): the temperature of the hot rolling mill is controlled at 140-200 ℃, and the pressure of the roller is adjusted to 50-100N/mm.
10. The formaldehyde-removing discoloring skeleton of claim 1, wherein in step 3): controlling the temperature of the hot rolling mill at 160-170 ℃; the pressure of the roller is adjusted to 60-80N/mm.
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CN100486687C (en) * 2007-06-21 2009-05-13 广西大学 Plastic-skeleton bentonite bentonite composite adsorbent and its production
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CN104888532B (en) * 2014-03-05 2017-03-15 江苏创云环保科技有限公司 A kind of filtering material and preparation method and purposes for air cleaner
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