CN108129963B

CN108129963B - Air purifier and decorative painting with remove formaldehyde function

Info

Publication number: CN108129963B
Application number: CN201711438923.5A
Authority: CN
Inventors: 何平
Original assignee: Hangzhou Bomei Culture Co ltd
Current assignee: Hangzhou Bomei Culture Co ltd
Priority date: 2017-12-26
Filing date: 2017-12-26
Publication date: 2020-08-04
Anticipated expiration: 2037-12-26
Also published as: CN108129963A

Abstract

The invention discloses an air purifier with a formaldehyde removing function, which comprises a shell; the invention also discloses a decorative picture with the function of removing formaldehyde, which comprises a picture frame, a back plate and a drawing board, wherein the picture frame, the back plate and the drawing board form a shell of the decorative picture; the air purifier and the decorative picture are provided with an air inlet and an air outlet on the shell, a plurality of layers of catalytic catalyst films are stretched at intervals in the shell, and air channels are formed in gaps among the catalytic catalyst films; the preparation method of the catalytic catalyst membrane comprises the following steps: (1) coating the UV curing coating containing the catalytic catalyst particles on a base film, and preheating the coating by adopting infrared light, wherein the preheating temperature is 50-130 ℃, and the preheating time is 5 s-5 min; (2) after preheating, ultraviolet light is used for curing. The air purifier has small volume and high formaldehyde removal efficiency.

Description

Air purifier and decorative painting with remove formaldehyde function

Technical Field

The invention relates to the field of air purification, in particular to an air purifier and a decorative painting with a formaldehyde removing function.

Background

The decoration materials usually contain pollutants harmful to human health, such as formaldehyde, toluene, TVOC and the like, and the formaldehyde content in the house which is just decorated exceeds the standard. At present, the formaldehyde removal technology is mainly divided into two types, one is physical formaldehyde removal, and the other is chemical formaldehyde removal. For example:

(1) window opening and ventilation: ventilation of a newly finished house is the most effective method for removing formaldehyde, and air with higher formaldehyde concentration is continuously exchanged to the outside through windowing.

(2) Green plant adsorption: after a few months of ventilation, the indoor formaldehyde concentration can be greatly reduced, pollutants enter a slow release process, the formaldehyde release period is as long as 15 years, and some people can cultivate some plants such as chlorophytum comosum, scindapsus aureus, agave, sansevieria trifasciata, ivy and the like indoors, wherein green plants have certain adsorption capacity on formaldehyde, but the adsorption area is very limited, and the adsorption efficiency is extremely low.

(3) Activated carbon adsorption: the activated carbon has the efficacy of adsorbing harmful substances such as formaldehyde, but the activated carbon only adsorbs the harmful substances without decomposition, has limited adsorption quantity, is very easy to saturate and needs to be frequently replaced, otherwise, the activated carbon with saturated adsorption can become a new pollution source to emit the harmful substances outwards, and secondary pollution is caused.

(4) Adsorbing the diatom ooze: the diatom ooze has strong adsorbability and ion exchange property, and has the functions of removing peculiar smell, preventing fire and retarding fire, adjusting humidity, sterilizing and disinfecting, insulating heat, saving energy, reducing noise and the like. The porous structure of diatom ooze makes it possible to adsorb formaldehyde and various organic volatile matters, but similar to activated carbon, diatom ooze can only adsorb organic volatile matters but cannot decompose them.

(5) A formaldehyde scavenger: the formaldehyde scavenger can only temporarily seal a pollution source to prevent formaldehyde from volatilizing in a short time, and pollutants are released again after a sealing layer is damaged, so the formaldehyde scavenger cannot completely remove formaldehyde pollution at all.

(6) An air purifier: the principle of present air purifier is mostly:

the first is that: after the air passes through the filter screen layer in the purifier, most pollutants and particulate matters are adsorbed by the filter screen material, and clean air is discharged. Most of the filter screens are activated carbon filter screens, can only passively adsorb formaldehyde, and need to be replaced periodically, so that the cost is high;

secondly, the following steps: the air purifier is internally provided with a catalytic catalyst net or a catalytic catalyst plate, and the existing catalytic catalyst net or catalytic catalyst plate has larger wind resistance, poorer light transmittance and insufficient illumination, so that the efficiency of catalyzing and degrading formaldehyde is not high; on the other hand, the conventional catalytic catalyst net or catalytic catalyst plate is obtained by directly and simply spraying or painting a catalyst liquid on a substrate net or plate, and a catalytic catalyst layer thereon is unevenly distributed and easily comes off.

(7) Removing formaldehyde by using a photocatalyst: the photocatalyst is a general name of a material with a photocatalytic function represented by nano-scale titanium dioxide, and has a photocatalytic effect under the action of light to generate active oxygen and hydroxyl radicals, so that harmful substances such as formaldehyde, benzene and TVOC in indoor air can be effectively degraded to generate nontoxic and harmless carbon dioxide and water, and secondary pollution cannot be generated.

In the prior art, liquid containing photocatalyst is sprayed or brushed on the surface of furniture or an indoor object through a spray gun or manual brushing to form a nano-screen-shaped protective layer, but the thickness of the protective layer is not uniform, the sprayed photocatalyst liquid is sticky after being dried, is easy to be stained with dust, and has certain corrosivity on furniture metal accessories.

Disclosure of Invention

The invention provides an air purifier with a formaldehyde removing function, which is small in size and high in formaldehyde removing efficiency.

The invention provides the following technical scheme:

an air purifier with a formaldehyde removing function comprises a shell, wherein an air inlet and an air outlet are formed in the shell, a plurality of layers of catalytic catalyst membranes are stretched in the shell at intervals, and air channels are formed in gaps among the catalytic catalyst membranes;

the preparation method of the catalytic catalyst membrane comprises the following steps:

(1) coating the UV curing coating containing the catalytic catalyst particles on a base film, and preheating the coating by adopting infrared light, wherein the preheating temperature is 50-130 ℃, and the preheating time is 5 s-5 min;

(2) after preheating, ultraviolet light is used for curing.

The invention also discloses a decorative picture with the formaldehyde removing function, which comprises a picture frame, a back plate and a drawing board, wherein the picture frame, the back plate and the drawing board form a decorative picture shell, the shell is provided with an air inlet and an air outlet, a plurality of layers of catalytic catalyst films are stretched in the shell at intervals, and gaps among the catalytic catalyst films form air channels;

(2) after preheating, ultraviolet light is used for curing.

Air enters from the air inlet and is discharged from the air outlet after passing through the gap between the catalytic catalyst films. When the air passes through the gap between the catalytic catalyst films, harmful substances (such as formaldehyde) in the air can be rapidly contacted with the catalytic catalyst particles to be catalytically degraded on the surface of the catalytic catalyst, so that the air is purified.

In order to enhance ventilation, an exhaust fan is also arranged in the shell.

The catalytic catalyst film is thin, and multiple layers can be arranged in a small space, so that the contact area of the catalytic catalyst and air is greatly increased, and the purification efficiency of the air purifier is improved; on the other hand, in the existing UV paint curing process, the UV curing paint coated on the substrate is directly subjected to UV photocuring, the catalytic catalyst can be uniformly wrapped in the paint resin layer after curing, only a small amount of the catalytic catalyst floats on the surface of the coating, and the catalytic catalyst wrapped in the paint resin layer cannot be contacted with air and cannot catalyze and degrade harmful gas molecules in the air, so that the catalytic degradation efficiency of the coating cured by the conventional method is low, the invention preheats the coating by adopting infrared light before the UV photocuring of the coating, rapidly reduces the viscosity of the coating, fully wets and levels the liquid resin in the coating and the substrate, simultaneously promotes solid catalytic catalyst particles to migrate to the surface of the coating and float on the surface of the coating, and then carries out ultraviolet photocuring, and most of the catalytic catalyst particles are fixed on the surface of the coating after the UV curing of the coating, can contact with the air, greatly improves the whole catalytic degradation efficiency of the coating, thereby improving the purification efficiency of the air purifier.

The decorative painting with the formaldehyde removing function integrates the air purifier and the interior of the decorative painting, and skillfully combines the functions of beautifying the environment and purifying the environment.

The catalytic catalyst is a photocatalyst-free catalyst.

The catalytic catalyst is a photocatalyst, and a light source is arranged in the shell.

The photocatalyst is nano titanium dioxide (such as Desmoset P25 gas phase nano titanium dioxide with the average particle size of 20nm, nano titanium dioxide with the model number of XQG05 of Shanghai Chongqing industry company, titanium dioxide with the model number of EFUT-C05 of Shanghai Yifu industry company and the like), and the photocatalyst is composite nano titanium dioxide (such as photocatalyst without the model number of L S L-G808F of Guangdong university industrial micro molecule research room).

The photocatalyst without light is different from the catalysis mechanism of the nano titanium dioxide light, has strong adsorbability, can generate point-to-point transfer of the characteristics of nano particles as long as the photocatalyst contacts with air, generates high-energy translocation reaction, can catalyze harmful gas to be decomposed into water and carbon dioxide under the condition of light or no light, and can permanently release negative oxygen ions without the photocatalyst to play a role in air purification.

Preferably, the particle size of the catalytic catalyst is 1-20 nm; more preferably, the particle size of the catalytic catalyst is 1-10 nm.

Preferably, the basement membrane is a transparent plastic film, and the catalyst is a photocatalyst.

When the basement membrane is transparent plastic film, the catalytic catalyst membrane is light-transmitting, and light source light can penetrate through the multiple layers of catalytic catalyst membranes, so that the illumination efficiency is improved, and the volume of the air purifier can be further reduced.

Preferably, the thickness of the base film is 10-20 microns, and the thickness of the coating on the surface of the base film is 3-15 microns.

The catalytic catalyst film is less strong when the base film is thin. When the thickness of the coating is less than 3 microns, the coating is too thin to completely cover the surface of the substrate, and the catalytic catalyst particles are not uniformly distributed, so that the overall catalytic performance of the coating is influenced; when the coating thickness is more than 15 microns, the coating is too thick, catalytic catalyst particles migrating on the surface of the coating are saturated, other catalytic catalysts are buried in the coating, the catalytic efficiency cannot be further improved along with the increase of the thickness, the cost is increased, and waste is caused.

Preferably, the distance between two adjacent catalytic catalyst membranes is 0.5 to 10 mm.

When the pitch is small, although the total surface area of the catalytic catalyst membrane can be increased, the wind resistance is increased; when the interval is great, the total surface area of catalysis catalyst membrane is less relatively, and air purifier's purification efficiency is not high.

Further preferably, the distance between two adjacent catalytic catalyst membranes is 0.5-5 mm; more preferably, the distance is 1-3 mm.

The interval can compromise windage and air purifier's purification efficiency simultaneously when 1~ 3 millimeters.

Preferably, in the step (1), the preheating temperature is 60-80 ℃, and the preheating time is 10-60 s.

The preheating temperature and the preheating time can influence the migration effect of the catalytic catalyst particles, and when the temperature is lower than 50 ℃, the catalytic catalyst particles cannot be fully migrated to the surface of the coating; at temperatures above 130 c, on the one hand, a small amount of the components in the coating volatilize to a fraction, producing fumes and affecting the properties of the cured coating, and on the other hand, at temperatures too high for preheating, the properties of the substrate are affected. When the preheating temperature and the preheating time are adopted, the catalytic catalyst particles can be fully transferred to the surface of the coating layer, and the performances of the coating layer and the substrate cannot be influenced.

Preferably, in the step (2), the wavelength of the ultraviolet light is 300-400 nm, and the energy of the ultraviolet light is 150-500 mJ/cm.

Preferably, before step (1), the method further comprises performing corona treatment on the surface of the substrate film to make the surface tension of the substrate greater than 38 dynes/cm.

Corona treatment of the substrate film surface can increase the adhesion between the coating and the substrate.

Preferably, the UV curing coating containing the catalytic catalyst particles comprises the following raw materials in parts by mass based on 100 parts by mass:

after the UV curing coating is cured, the UV coating is soft and has good adhesion, and the UV curing coating has good adhesion fastness to various transparent plastic films such as PET, PVDF, PVC, treated PP, PE and the like; the shrinkage rate of the UV coating is extremely low, and the curling or deformation of a substrate cannot be caused; the UV coating has high elongation at break, and the UV coating does not crack or fall off during the bending, stretching or compounding process of the substrate and other substrates (such as aluminum ceilings).

Preferably, the photosensitive polymer is at least one of hyperbranched polyester acrylate with 6-8 functionality; the number average molecular weight of the photosensitive polymer is 700-3500.

Further preferably, the hyperbranched polyester acrylate is UV7200 or UV7-4X of Qianzyo corporation in Zhongshan, B-570 or B-574 of Boxing technology, EB-81 or EB-837 of Cyanid corporation in USA, or 6361-100 or 6362-100 of Changxing Chemicals in Taiwan.

Preferably, the thermoplastic resin is a polymer or copolymer of acrylate, methacrylate, butyl methacrylate or methyl methacrylate.

The thermoplastic resin is mainly used for improving the contractibility and the flexibility of the UV coating and enhancing the adhesive force of the UV coating to different plastic substrates. The thermoplastic resin is solid powder or particles, and can be mixed with the rest components after being dissolved by the low-viscosity photosensitive prepolymer or the photosensitive monomer, wherein the dissolving temperature is 40-70 ℃, and the content of the thermoplastic resin is 30-50%.

More preferably, the thermoplastic resin is an iso-butyl methacrylate polymer or a butyl methacrylate copolymer; the weight average molecular weight of the butyl methacrylate polymer is 70000-90000 (such as AR-500 of Taiwan co-Ltd., Tg 42 ℃, weight average molecular weight 80000), and the weight average molecular weight of the butyl methacrylate copolymer is 100000-200000 (such as HY-10 of Guangzhou Haoyi chemical industry, the softening point is more than 110 ℃, and the acid value is less than 1mg KOH/g).

The photoactive monomer is at least one of isobornyl acrylate (IBOA), isobornyl methacrylate (IBOMA), ethoxylated tetrahydronapthyl acrylate (TH (EO) FA), 1, 6-hexanediol diacrylate (HDDA) and propoxylated neopentyl glycol diacrylate (NPG2 PODA).

The photoactive monomer is mainly used for adjusting the viscosity of the coating and the performance of a coating curing film.

The photosensitizer is at least one of 1-hydroxycyclohexyl benzophenone (184), 2-hydroxy-2-methyl-1-phenyl-1-acetone (1173) and 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO).

The filler is talcum powder with the granularity of 800-2000 meshes, fumed silica or polypropylene wax powder with the grain size of 2-10 microns.

The defoaming agent is a product which is commercially available at present, such as 201 methyl silicone oil and the like.

The dispersant is an acidic group-containing copolymer or a solution thereof; such as BYK-110, BYK-111, BYK-160 or BYK-168, modified acrylate copolymers such as BYK-2000, BYK-2009, and the like.

The UV curing coating with the formaldehyde removing function can be obtained by mixing and grinding the raw materials.

Compared with the prior art, the invention has the beneficial effects that:

the catalytic catalyst film in the air purifier is thin, and a plurality of layers of catalytic catalyst films can be arranged in a small space, so that the contact area of the catalytic catalyst and air is greatly increased, and the purification efficiency of the air purifier is improved; on the other hand, when the catalytic catalyst film is prepared, before the coating is subjected to UV photocuring, infrared light is firstly adopted to preheat the coating, so that the viscosity of the coating is rapidly reduced, liquid resin in the coating is fully wetted and leveled with a substrate, solid catalytic catalyst particles are promoted to migrate to the surface of the coating and float on the surface of the coating, then the coating is completely cured by ultraviolet light irradiation, after the UV curing, most of the catalytic catalyst particles are fixed on the surface of the coating and can be in contact with air, and the surface of the coating is in a matte or semi-matte state, so that the catalytic degradation efficiency of the whole coating is greatly improved, and the purification efficiency of an air purifier is improved.

Drawings

FIG. 1 is a schematic structural view of a decorative painting with formaldehyde removal function;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic diagram of a method for preparing a catalytic membrane.

Detailed Description

The invention will be described in further detail below with reference to the drawings and examples, which are intended to facilitate the understanding of the invention without limiting it in any way.

As shown in figures 1 and 2, the decorative picture with the formaldehyde removing function comprises a picture frame 1, a back plate 2 and a drawing board 3, wherein the picture frame 1, the back plate 2 and the drawing board 3 form a shell of the decorative picture and enclose an air purification space. The shell is provided with an air inlet and an air outlet, a plurality of layers of catalytic catalyst films 4 are stretched at intervals in the shell, and air channels are formed in gaps among the catalytic catalyst films 4.

The thickness of the decorative picture is 40-50 mm, and the distance between adjacent catalytic catalyst films 4 is 1-3 mm.

In order to enhance ventilation, exhaust fans 5 are arranged at the air inlet and the air outlet.

The catalytic catalyst film 4 comprises a base film and a UV curing coating layer coated and cured on the surface of the base film, wherein the UV curing coating contains catalytic catalyst particles.

The catalyst may be a photocatalyst, which is a composite nano-titania (such as L S L-G808F, model number of Micromolecule research laboratory of Guangdong university of industry), or a photocatalyst, such as nano-titania (such as Desgase P25 gas phase nano-titania, average particle size of 20 nm; XQG05 nano-titania of Shanghai Xiqing industries, model number of EFUT-C05, model number of Shanghai Yifu industries, etc.).

When the catalyst is a photocatalyst, a light source is needed in the shell and can be arranged on the inner side of the periphery of the back plate or the picture frame.

When the catalyst is a photocatalyst, the substrate film is preferably a transparent plastic film, such as a PET film, so that the catalyst film is transparent, and the light of the light source can penetrate through several layers of catalyst films, thereby improving the utilization efficiency of the light source.

If the UV curing coating coated on the substrate is directly subjected to UV photocuring, the catalytic catalyst can be uniformly wrapped inside the coating resin layer and cannot be contacted with air, only a small amount of the catalytic catalyst floats on the surface of the coating, and only when the catalytic catalyst is contacted with harmful gas molecules in the air, the catalytic degradation can be carried out on the coating, so that the overall catalytic degradation efficiency of the coating is low when the coating is cured by adopting a conventional method.

According to the invention, before UV photocuring of the coating, infrared light is adopted to preheat the coating, so that the viscosity of the coating is rapidly reduced, liquid resin in the coating is fully wetted and leveled with a substrate, solid catalytic catalyst particles are promoted to migrate to the surface of the coating and float on the surface of the coating, then the coating is fully cured by ultraviolet irradiation, after UV curing, most catalytic catalyst particles are fixed on the surface of the coating and can fully contact with air, and the surface of the coating is in a matte or semi-matte state, so that the catalytic degradation efficiency of the whole coating is greatly improved, as shown in figure 3.

The specific implementation mode of the formula of the UV curing coating and the curing method thereof is as follows:

example 1

The formula of the UV curing coating comprises: 15 parts of hyperbranched polyester acrylate (UV 7200 of Zhongshan Qianzyo company), 16 parts of thermoplastic resin (IBMA polymer AR-500 of butyl methacrylate IBMA of Taiwan Co., Ltd.), 55 parts of IBOA, 3.0 parts of 1-hydroxycyclohexyl phenyl ketone, 1.5 parts of Desmoset P25 nanometer titanium dioxide, 6.5 parts of 1250-mesh superfine talcum powder, BYK-1112 parts of dispersing agent and 0.5 part of 201 methyl silicone oil defoaming agent.

And (2) stirring 15 parts of the thermoplastic resin and 50 parts of IBOA for 4.5 hours at 50 ℃, mixing with the rest components after complete dissolution and uniformly stirring at high speed, and grinding by three rollers to a certain fineness to obtain the UV coating with the formaldehyde removal function.

Coating, preheating and UV curing conditions: the surface tension of the PET film (thickness 15 microns) after corona treatment is 42 dyne/cm, and the front and back surfaces are coated with the coating by UV, and the thickness is 5 microns. The IR preheat temperature was 70 deg.C, the preheat time was 20 seconds, and the UV curing energy was 300 mJ/cm.

Example 2

The formula of the UV curing coating comprises: 20 parts of hyperbranched polyester acrylate (B-570 of Boxing science and technology), 15 parts of thermoplastic resin (HY-10 of Guangzhou Haoye chemical industry), 54 parts of HDDA (high-density polyethylene) 2.0 parts of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO), 2.5 parts of Texaco P25 nano titanium dioxide, 5 parts of fumed silica, BYK-1101 parts of a dispersing agent and 0.5 part of a 201 methyl silicone oil defoaming agent.

And (3) stirring 15 parts of the thermoplastic resin and 54 parts of HDDA for 3.5 hours at 50 ℃, mixing with the rest components after complete dissolution and uniformly stirring at a high speed, and grinding by three rollers to a certain fineness to obtain the UV coating with the formaldehyde removing function.

Coating, preheating and UV curing conditions: the surface tension of the PET film (thickness 15 microns) after corona treatment is 42 dyne/cm, and the front and back surfaces are coated with UV coating, and the thickness is 5 microns. The IR preheat temperature was 70 deg.C, the preheat time was 20 seconds, and the UV curing energy was 300 mJ/cm.

Example 3

The formula of the UV curing coating comprises: 20 parts of hyperbranched polyester acrylate (B-570 of Boxing science and technology), 15 parts of thermoplastic resin (HY-10 of Guangzhou Haoye chemical industry), 52 parts of HDDA (high-density polyethylene) 2.0 parts of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO), 3.5 parts of Texaco P25 nano titanium dioxide, 6 parts of fumed silica, BYK-1101 parts of a dispersing agent and 0.5 part of a 201 methyl silicone oil defoaming agent.

And (2) stirring 15 parts of the thermoplastic resin and 52 parts of HDDA for 3.5 hours at 50 ℃, mixing with the rest components after complete dissolution and uniformly stirring at a high speed, and grinding by three rollers to a certain fineness to obtain the UV coating with the formaldehyde removing function.

Example 4

The formula of the UV curing coating comprises: 25 parts of hyperbranched polyester acrylate (100 of Taiwan Changxing chemical 6361-), 15 parts of thermoplastic resin (IBMA polymer AR-500 of butyl methacrylate IBMA of Taiwan Proco., Ltd.), 25 parts of HDDA, 25 parts of IBOA, 2.0 parts of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO), 1.5 parts of 5-nanometer XQG 05-nanometer titanium dioxide of Shanghai Xiongqing industries, 5 parts of polypropylene wax powder (average particle size of 10 micrometers), 1111 parts of dispersant BYK-1111 and 0.5 part of 201 methyl silicone oil defoamer.

And (2) stirring 15 parts of the thermoplastic resin, 25 parts of HDDA (high-density polyethylene) and 25 parts of IBOA (ethylene-butylene-adipate) at 50 ℃ for 3.5 hours, mixing the thermoplastic resin with the rest components after complete dissolution, uniformly stirring at a high speed, and grinding by three rollers to a certain fineness to obtain the UV coating with the formaldehyde removal function.

Example 5

The UV coating was formulated according to the coating formulation of example 4.

Coating, preheating and UV curing conditions: the surface tension of the PET film (thickness 15 microns) after corona treatment is 42 dyne/cm, and the front and back surfaces are coated with UV coating, and the thickness is 15 microns. The IR preheat temperature was 70 deg.C, the preheat time was 10 seconds, and the UV curing energy was 300 mJ/cm.

Example 6

The formula of the UV curing coating comprises 20 parts of hyperbranched polyester acrylate (B-570 of Boxing science and technology), 15 parts of thermoplastic resin (HY-10 of Kao-Yi chemical engineering of Guangzhou), 54 parts of HDDA (Haoya), 2.0 parts of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO), 2.5 parts of photocatalyst-free (composite nano titanium dioxide L S L-G808F), 5 parts of fumed silica, BYK-1101 parts of a dispersing agent and 0.5 part of a 201 methyl silicone oil defoaming agent.

Example 7

The formula of the UV curing coating comprises 20 parts of hyperbranched polyester acrylate (B-570 of Boxing science and technology), 15 parts of thermoplastic resin (HY-10 of Kao-Yi chemical engineering of Guangzhou), 54 parts of HDDA (Haoya), 2.0 parts of 2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide (TPO), 5.0 parts of photocatalyst-free (composite nano titanium dioxide L S L-G808F), 5 parts of fumed silica, BYK-1101 parts of a dispersing agent and 0.5 part of a 201 methyl silicone oil defoaming agent.

Comparative example 1

The UV coating was formulated according to the coating formulation of example 3.

Coating and UV curing conditions: the surface tension of the PET film (thickness 15 microns) after corona treatment is 42 dyne/cm, and the front and back surfaces are coated with UV coating, and the thickness is 5 microns. UV light curing was carried out without IR preheating, with UV curing energy of 300 mJ/cm.

Evaluation of UV Formaldehyde removal film Performance

First, appearance evaluation

The appearance of the cured film was evaluated by visual inspection.

Good: the cured coating is uniform and consistent, and has good transparency

Difference: the cured coating was not uniform and generally transparent.

Second, evaluation of adhesion

The adhesion of the ink layer to the glass was measured according to the adhesion test method of GB4677.7-84, tape stripping method. 100% is the best, 0% is the worst.

Third, formaldehyde purification efficiency

Sample preparation: the coatings of examples 1 to 5 and comparative example 1 were applied to both sides of a PET film having an area of 0.25 square meter, and subjected to IR preheating and UV curing as required.

The test conditions are as follows: 4 plastic film samples, the volume of the experimental chamber is 1 cubic meter, the test temperature is 25 ℃, and the relative humidity is 59 percent. Under the same condition, the formaldehyde purification efficiency is calculated according to the measured formaldehyde gas termination concentration (mg/cubic meter) of the comparison chamber and the test chamber after the indoor daylight lamp is used for 24 hours, and the test result is shown in table 1.

TABLE 1

From the data in table 1, it can be seen that infrared preheating can greatly improve the catalytic efficiency of the coating.

The above-mentioned embodiments are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions, equivalents, etc. made within the scope of the principles of the present invention should be included in the scope of the present invention.

Claims

1. An air purifier with a formaldehyde removing function comprises a shell, wherein an air inlet and an air outlet are formed in the shell, and the air purifier is characterized in that a plurality of layers of catalytic catalyst membranes are stretched in the shell at intervals, and air channels are formed in gaps among the catalytic catalyst membranes; the catalytic catalyst is a photocatalyst, and a light source is arranged in the shell;

(1) coating the UV curing coating containing the catalytic catalyst particles on a base film, and preheating the coating by adopting infrared light, wherein the preheating temperature is 50-130 ℃, and the preheating time is 5 s-5 min; the base film is a transparent plastic film;

(2) after preheating, ultraviolet light is adopted for curing;

the UV curing coating containing the catalytic catalyst particles comprises the following raw materials in parts by mass based on 100 parts by mass:

15-35 parts of a photosensitive polymer;

10-25 parts of thermoplastic resin;

35-65 parts of a photoactive monomer;

1-5 parts of a photosensitizer;

1-8 parts of a catalytic catalyst;

5-10 parts of a filler;

0.1-5 parts of a dispersing agent;

0-1 part of a defoaming agent;

the photosensitive polymer is at least one of hyperbranched polyester acrylate with 6-8 functionality.

2. The air purifier of claim 1, wherein the thickness of the substrate film is 10-20 microns, and the thickness of the coating on the surface of the substrate film is 3-15 microns.

3. The air purifier of claim 1, wherein a distance between two adjacent catalytic catalyst membranes is 0.5 to 10 mm.

4. The air purifier according to claim 1, wherein in the step (1), the preheating temperature is 60-80 ℃ and the preheating time is 10-60 s.

5. The air cleaner of claim 1, further comprising, prior to step (1), corona treating the surface of the substrate to a surface tension of greater than 38 dynes/cm.

6. A decorative picture with a formaldehyde removing function comprises a picture frame, a back plate and a drawing board, wherein the picture frame, the back plate and the drawing board form a shell of the decorative picture, and the shell is provided with an air inlet and an air outlet; the catalytic catalyst is a photocatalyst, and a light source is arranged in the shell;