CN104689708A - Formaldehyde-removing and air-purifying filter core based on inclined-hole aluminum honeycomb plate and preparation method thereof - Google Patents

Abstract

The invention discloses a formaldehyde-removing and air-purifying filter core based on an inclined-hole aluminum honeycomb plate. The formaldehyde-removing and air-purifying filter core based on the inclined-hole aluminum honeycomb plate comprises a formaldehyde-removing coating and an aluminum honeycomb plate. The aluminum honeycomb plate is a plate-like body consisting of hexagonal pore passages; and an included angle between each of the hexagonal pore passages and a vertical direction of the front side of the plate-like body is 5-20 degrees. The formaldehyde-removing coating is prepared by coating, drying and solidifying a formaldehyde-removing dope onto inner surfaces of the hexagonal pore passages. The formaldehyde-removing dope is a mixture. Ingredients of the mixture comprise active carbon, calcium peroxide, calcium oxide, manganese dioxide, potassium carbonate, and an adhesive. The invention further discloses a preparation method of the formaldehyde-removing and air-purifying filter core based on the inclined-hole aluminum honeycomb plate. The provided formaldehyde-removing and air-purifying filter core based on the inclined-hole aluminum honeycomb plate is able to achieve a formaldehyde-removing rate of up to 93% within 2.5 minutes, and a formaldehyde-removing rate in the air of up to 100% within 10 minutes. Comparing to grained formaldehyde-removing fillers, the windage resistance is reduced by 98%. The formaldehyde-removing and air-purifying filter core based on the inclined-hole aluminum honeycomb plate is characterized in a high formaldehyde-removing efficiency, a high-temperature resistance, a low air resistance, anti-corrosion property, a long service life, and the like.

Description

A formaldehyde-removing air purification filter element based on inclined-hole aluminum honeycomb plate and preparation method thereof

technical field

The invention relates to a design and preparation method of a formaldehyde-removing air purification filter element. The filter element can be used in various air purifiers, air conditioners and fresh air systems.

Background technique

Modern people spend more than 90% of their time indoors or in cars. In a limited space, the pollution of volatile organic compounds (VOD) seriously endangers the health of modern people. Formaldehyde pollution, as the main VOD pollution, has received extensive attention. The sources of formaldehyde are more complex, mainly including urea-formaldehyde/phenolic resin wood-based panels, or plywood containing formaldehyde, blockboard, medium density fiberboard and particle board, composite flooring; decorative materials containing formaldehyde, such as wallpaper, paint, adhesives; during the manufacturing process Uses formaldehyde and may have residual textile fibers, dyes, cleaning agents, etc.

Due to its chemical activity, formaldehyde can directly destroy the structure of proteins and biomolecules, causing various health effects on the human body. Long-term exposure to low-concentration formaldehyde can cause discomfort in the respiratory system, cause chronic respiratory diseases, and increase the incidence of various cancers, such as nasopharyngeal cancer and colon cancer. High concentrations of formaldehyde can even cause nervous system diseases. Pregnant women, children and the elderly are among the groups most susceptible to formaldehyde. For example, pregnant women living in an environment with excessive formaldehyde for a long time can easily induce neonatal deformities and slow brain development, and even cause miscarriage.

my country's "Indoor Air Quality Standards" formulated by the National Bureau of Quality Supervision, Inspection and Quarantine, the State Environmental Protection Administration, and the Ministry of Health clearly stipulate that the concentration of formaldehyde in the living room must not exceed 0.1 mg/m3. In newly renovated rooms, offices and other places, it is very common for formaldehyde to exceed the standard. The release of formaldehyde from decoration materials is a slow process, and its release period can reach 3-15 years. Therefore, it has become an important choice for modern homes to remove indoor formaldehyde pollution through different purification devices, such as air purifiers, air conditioning systems or fresh air systems.

At present, indoor air purification technology mainly includes three categories. The first type is physical adsorption through porous materials such as activated carbon, clay, and molecular sieves. However, the amount of adsorption is usually limited, and desorption will be caused when the temperature and humidity change. The second category is to catalyze oxidation by photocatalysis or plasma and negative ion technology. But usually these methods are slow to remove formaldehyde and cannot be completely removed. The third type is to directly oxidize formaldehyde through potassium permanganate, calcium peroxide, etc., so as to achieve the purpose of removing formaldehyde. This type of method usually has a fast reaction rate and a high removal rate. Oxidation-based removal of formaldehyde requires a large oxidant load. Its oxidant is supported on millimeter-scale solid particles or other millimeter-scale carriers (such as activated carbon, clay, alumina molecular sieve, etc.). However, although this type of design can ensure high formaldehyde removal efficiency, it causes a lot of wind resistance and wind noise. In particular, it will affect the emission of clean air per unit time of air purifiers, air conditioners and fresh air systems. Especially for the fresh air system, due to its low wind power, the usual formaldehyde removal filter element is likely to cause blockage of its air duct, affecting its normal use. Therefore, it is very necessary to develop a new type of formaldehyde removal filter element with low wind resistance and high purification efficiency.

Contents of the invention

The problem to be solved by the present invention is to propose an innovative solution for the above-mentioned shortcomings in the prior art, especially a formaldehyde-removing air purification filter element based on inclined-hole aluminum honeycomb panels that can quickly and effectively remove formaldehyde in the air.

In order to solve the above problems, the scheme adopted by the present invention is as follows:

A formaldehyde-removing air purification filter element based on oblique-hole aluminum honeycomb panels, including a formaldehyde-removing coating and an aluminum honeycomb panel, the aluminum honeycomb panel is a plate-shaped body composed of hexagonal channels, and the hexagonal channels and the plate-shaped body The included angle in the vertical direction of the front is 5-20 degrees; the formaldehyde removal coating is obtained by drying and curing the formaldehyde removal coating on the inner surface of the hexagonal channel. The formaldehyde removal coating is a mixture, and the mixture component includes activated carbon , calcium peroxide, calcium oxide, manganese dioxide, potassium carbonate, adhesive.

After experiments, the weight ratio range of activated carbon, calcium peroxide, calcium oxide, manganese dioxide, potassium carbonate, and adhesive for each component of the formaldehyde-removing coating is 1: (0.5-2): (0.5-2): (0.01- 0.2): (0.2-0.8): 0.5 has the highest efficiency in removing formaldehyde from the air. Especially when the loading adhesive is preferably acrylate, the effect is better.

The aluminum honeycomb panel of the present invention is a plate-shaped body composed of hexagonal channels, and the angle between the hexagonal channels and the vertical direction of the front of the plate-shaped body is 5-20 degrees, and the maximum diameter of the hexagonal channels is 0.6-2 mm, the thickness of the aluminum honeycomb panel is 0.5-1.5 cm, and when the angle between the hexagonal channel and the vertical direction of the plate is preferably 10 degrees, the formaldehyde removal rate can reach 93% in 2.5 minutes, and the formaldehyde removal rate can reach 100% in 10 minutes. The air resistance of the filter element of the present invention is 1/50 of the air resistance of the filter element in the prior art. And the best balance between air resistance and formaldehyde removal speed can be achieved by changing the inclination angle of the hexagonal channel.

The present invention also provides a method for preparing formaldehyde-removing air purification filter elements based on inclined-hole aluminum honeycomb panels, which solves the technical problem of efficient and stable loading of formaldehyde-removing coatings on aluminum honeycomb panels. The loading capacity on the aluminum honeycomb can reach 5 grams per square centimeter.

A kind of preparation method of formaldehyde-removing air purification filter element based on inclined-hole aluminum honeycomb plate provided by the present invention comprises the following steps:

First, mix activated carbon with calcium peroxide, calcium oxide, and potassium carbonate to obtain a mixture, then add deionized water equal to the weight of the mixture, then add adhesive and manganese dioxide, and mix well to obtain a formaldehyde-removing coating. Manganese has a particle size of less than 1 micron;

Mix the formaldehyde-removing paint and water in a ratio of 1:0.5-1:2 to prepare a formaldehyde-removing paint mixture, immerse the aluminum honeycomb panel in the formaldehyde-removing paint mixture, cover it evenly, and remove the blocked hexagons with a blower The remaining formaldehyde-removing paint mixture in the channels, and then dry the aluminum honeycomb panel loaded with the formaldehyde-removing paint mixture, so that the formaldehyde-removing paint mixture is solidified to form a formaldehyde-removing coating, and naturally cooled to room temperature. The aluminum honeycomb panel is made of A plate-shaped body composed of hexagonal channels, and the angle between the hexagonal channels and the vertical direction of the surface of the plate-shaped body is 5-20 degrees.

In the present invention, it is preferred to mix the formaldehyde-removing paint with water in a ratio of 1:1.

The effect of each component of the formaldehyde-removing coating used in the formaldehyde-removing air purification filter element based on the inclined-hole aluminum honeycomb plate of the present invention is as follows respectively: activated carbon increases the specific surface area after the coating is dried; calcium peroxide is the main component of oxidized formaldehyde; manganese dioxide As a catalyst, oxygen in the air and calcium peroxide can be used to oxidize formaldehyde; calcium oxide can remove excess water and prevent deliquescence; potassium carbonate can neutralize the generated formic acid; acrylate can improve the adhesion of paint on aluminum honeycomb .

When preparing formaldehyde-removing paint, first mix activated carbon with calcium peroxide, calcium oxide, and potassium carbonate to obtain a mixture, then add deionized water equal to the weight of the mixture, and finally add adhesive and manganese dioxide, and mix well. Wherein the particle size of manganese dioxide is less than 1 micron. It must be used immediately after mixing.

It is preferred that the weight ratio range of activated carbon, calcium peroxide, calcium oxide, manganese dioxide, potassium carbonate, and adhesive for each component of the formaldehyde-removing coating is 1: (0.5-2): (0.5-2): (0.01-0.2): (0.2-0.8): 0.5 has the highest efficiency of removing formaldehyde in the air. Especially when acrylate is used as adhesive, the effect is better.

The technical problem to be solved by the present invention is to provide a formaldehyde-removing filter element that is simple, efficient, and has low wind resistance, and is used in air purifiers, air conditioners, and fresh air systems. For a confined space of 10 cubic meters, its formaldehyde removal rate can reach 93% within 2.5 minutes and 100% within 10 minutes.

The invention is a composite material based on an oblique hole aluminum honeycomb air purification filter element for removing formaldehyde. Its matrix is shown in Figure 1, which is a honeycomb aluminum plate. After its surface is loaded with a formaldehyde-removing material layer composed of activated carbon, calcium peroxide, and potassium carbonate, it can be directly used in various air purifiers, air conditioners, and fresh air systems. Aluminum honeycomb can greatly reduce wind resistance, and the design of inclined holes can increase the contact area and contact time between air and formaldehyde removal coating. The special formaldehyde-removing coating attachment process can avoid clogging the aluminum honeycomb channels during the production process. The invention has the advantages of small wind resistance, fast formaldehyde removal speed, high efficiency and thorough removal.

Under the condition of the optimal slanted hole aluminum honeycomb substrate structure and the optimal formaldehyde removal coating ratio, the formaldehyde removal rate can reach 93% in 2.5 minutes, reaching the national standard safety value, and the formaldehyde can be completely removed in 10 minutes. At the same time, the air resistance is reduced by 98% compared with the granular formaldehyde removal filler.

Using the method of the invention can effectively solve the technical problem of efficient and stable loading of formaldehyde-removing coatings on aluminum honeycomb panels, and the loading capacity on aluminum honeycombs with a diameter of 1 mm and a thickness of 1 cm can reach 5 grams per square centimeter.

Description of drawings

Figure 1: Schematic diagram of the structure of an air purification filter element for removing formaldehyde based on inclined-hole aluminum honeycomb panels.

Figure 2: Scanning electron microscope pictures of the microstructure of the formaldehyde-removing coating.

Fig. 3: the present invention compares with prior art, and the filter core of control group selects the filter core of fresh air air purifier, and wind speed is air outlet wind speed value, measures by anemometer, and control group and experiment group measure ten times respectively, normalize with control group average value One, the wind speed of the air purification filter element based on the inclined-hole aluminum honeycomb panel for removing formaldehyde in the present invention is more than 50 times that of the control group.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

In all the embodiments, the aluminum honeycomb panels used in the formaldehyde-removing air purification filter element based on the inclined-hole aluminum honeycomb panels all adopt aluminum substrates with a length and width of 30 cm to 20 cm, and the thickness of the aluminum honeycomb panels is 0.5-1.5 cm. The aluminum substrate is a plate-shaped body composed of hexagonal channels, and the angle between the hexagonal channels and the vertical direction of the front of the plate-shaped body is 5-20 degrees. The components of the formaldehyde removal coating include activated carbon, calcium peroxide, calcium oxide, manganese dioxide, potassium carbonate, and adhesive. The formaldehyde removal coating is coated on the inner surface of the hexagonal channel of the aluminum honeycomb panel and cured to form a formaldehyde removal layer.

Place a fresh air air purifier in the test chamber and use three sets of filter elements. For the convenience of comparison, all filter elements use a special HEPA membrane to remove PM2.5.

All the tests of the present invention are carried out at normal temperature and pressure, namely 23 degrees centigrade and 1 atmospheric pressure, in a test chamber of 10 cubic meters, and the initial formaldehyde concentration is between 0.07-0.15 mg/m3. The air purifier used in the test is a fresh air purifier model, and it is at the highest wind speed when working. The measurement of formaldehyde concentration adopts PPM-400ST formaldehyde measuring instrument.

The filter element preparation steps are as follows:

Step 1: Mix activated carbon, calcium peroxide, calcium oxide and potassium carbonate to prepare a mixture, add deionized water at a ratio of 1:1 to the weight of the mixture, and mix well to obtain a mixed liquid;

Step 2: adding manganese dioxide to the mixed liquid;

Step 3: Add acrylate to the mixed liquid and mix well;

Step 4: Dilute the formaldehyde-removing coating obtained in the above steps with deionized water 1:1, put it into the aluminum honeycomb panel, and dip for 3-5 minutes until the surface of the aluminum honeycomb panel is completely covered with the coating;

Step 5: Use a blower to blow off the residual formaldehyde-removing paint on its surface and blocking the hexagonal channels;

Step 6: Bake in an oven at 160 degrees Celsius for 5 minutes to cure.

Other specific parameters, formaldehyde removal paint ratio and formaldehyde removal effect are shown in the table below.

Table 1. Formaldehyde removal effect of formaldehyde removal filter elements under different ratio conditions

Note: The quality of activated carbon, calcium peroxide, calcium oxide, manganese dioxide, and potassium carbonate in the formula is the amount used when configuring formaldehyde-removing paint, not the actual loading amount. The load can be calculated proportionally from the total load.

Claims (10)

1. A formaldehyde-removing air purification filter element based on inclined-hole aluminum honeycomb panels, including formaldehyde-removing coatings and aluminum honeycomb panels, characterized in that, the aluminum honeycomb panels are plate-shaped bodies made up of hexagonal channels, and the hexagonal The angle between the shaped channel and the vertical direction of the front of the plate-shaped body is 5-20 degrees; the formaldehyde-removing coating is obtained by coating the formaldehyde-removing paint on the inner surface of the hexagonal channel and drying and curing. The formaldehyde-removing paint is a mixture. The mixture components include activated carbon, calcium peroxide, calcium oxide, manganese dioxide, potassium carbonate and adhesive. 2. as claimed in claim 1 based on the oblique hole aluminum honeycomb plate to remove formaldehyde air purification filter element, it is characterized in that, each component activated carbon, calcium peroxide, calcium oxide, manganese dioxide, salt of wormwood, tackiness agent of described formaldehyde removal coating The weight ratio range is 1:(0.5-2):(0.5-2):(0.01-0.2):(0.2-0.8):0.5. 3. The formaldehyde-removing air purification filter element based on inclined-hole aluminum honeycomb panels as claimed in claim 1, wherein the adhesive is acrylate. 4. As claimed in claim 1, based on the inclined-hole aluminum honeycomb panel for removing formaldehyde, the air purification filter element is characterized in that, the maximum diameter of the hexagonal channel of the aluminum honeycomb panel is 0.6-2 mm, and the thickness of the aluminum honeycomb panel is 0.5 mm. -1.5 cm, the angle between the hexagonal channel and the vertical direction of the front of the plate-shaped body is 5-20 degrees. 5. The formaldehyde-removing air purification filter element based on inclined-hole aluminum honeycomb panels as claimed in claim 4, wherein the angle between the hexagonal channels and the vertical direction of the front of the plate-shaped body is 10 degrees. 6. as claimed in claim 1 based on the preparation method of formaldehyde-removing air purification filter element based on inclined hole aluminum honeycomb plate, it is characterized in that comprising the following steps: First, mix activated carbon with calcium peroxide, calcium oxide, and potassium carbonate to obtain a mixture, then add deionized water equal to the weight of the mixture, then add adhesive and manganese dioxide, and mix well to obtain a formaldehyde-removing coating. Manganese has a particle size of less than 1 micron; Mix the formaldehyde-removing paint and water in a ratio of 1:0.5-1:2 to prepare a formaldehyde-removing paint mixture, immerse the aluminum honeycomb panel in the formaldehyde-removing paint mixture, cover it evenly, and remove the blocked hexagons with a blower The remaining formaldehyde-removing paint mixture in the channels, and then dry the aluminum honeycomb panel loaded with the formaldehyde-removing paint mixture, so that the formaldehyde-removing paint mixture is solidified to form a formaldehyde-removing coating, and naturally cooled to room temperature. The aluminum honeycomb panel is made of A plate-shaped body composed of hexagonal channels, and the angle between the hexagonal channels and the vertical direction of the front of the plate-shaped body is 5-20 degrees. 7. method as claimed in claim 6, is characterized in that, the weight ratio ratio range of each component activated carbon, calcium peroxide, calcium oxide, manganese dioxide, salt of wormwood, tackiness agent of described formaldehyde-removing coating is 1:(0.5- 2): (0.5-2): (0.01-0.2): (0.2-0.8): 0.5. 8. The method according to claim 6, wherein the formaldehyde-removing paint is mixed evenly with water in a ratio of 1:1. 9. The method according to claim 6, wherein the maximum diameter of the hexagonal channel of the aluminum honeycomb panel is 0.6-2 mm, the thickness of the aluminum honeycomb panel is 0.5-1.5 cm, and the hexagonal channel The angle with the vertical direction of the front of the aluminum honeycomb panel is 5-20 degrees. 10. The method according to claim 9, wherein the angle between the hexagonal channel and the vertical direction of the front of the aluminum honeycomb panel is 10 degrees.