WO2018209799A1

WO2018209799A1 - Formaldehyde-removing and moldproof coating for filter materials and preparation method therefor

Info

Publication number: WO2018209799A1
Application number: PCT/CN2017/093753
Authority: WO
Inventors: 肖永祥; 施志泉
Original assignee: 南通美亚新型活性炭制品有限公司
Priority date: 2017-05-17
Filing date: 2017-07-20
Publication date: 2018-11-22
Also published as: CN107903666A

Abstract

A formaldehyde-removing and moldproof coating for filter materials, consisting of the following components in parts by weight: 50-65 parts of water; 10-15 parts of pseudo boehmite; 10-15 parts of zeolite powder; a thickening agent consisting of 0.2-0.4 part of carboxymethyl cellulose sodium; 5-8 parts of a self-crosslinking acrylic emulsion; 4-7 parts of an amine-based formaldehyde removing agent; 3-5 parts of activated carbon or 5-7 parts of an aqueous pigment paste; and 0.5-0.7 part of an antibacterial agent. The coating is prepared by stirring and mixing the components in a certain sequence until uniform. The prepared coating is sprayed onto an air filter material or applied to an air filter material through dip-coating and then the filter material is dried at 80-110℃, so that a common filter material can have the formaldehyde removing effect.

Description

Aldehyde-proof mold-proof coating for filter material and preparation method thereof

Technical field

The invention relates to the field of aldehyde removal technology, in particular to an aldehyde-removing mold-proof coating for a filter material and a preparation method thereof.

Background technique

Air purifiers, also known as "air cleaners", air purifiers, purifiers, are capable of adsorbing, decomposing or converting various air pollutants (generally including PM2.5, dust, pollen, odor, formaldehyde, etc.). , bacteria, allergens, etc., products that effectively improve air cleanliness, mainly divided into household, commercial, industrial, and building.

Formaldehyde is a small molecule that is volatile and highly polar, and has high toxicity and is very harmful to humans. At present, domestic interior decoration materials such as phenolic, urea-formaldehyde and melamine-formaldehyde resin adhesives are widely used. When the sheet is produced, the hot pressing time is shortened, resulting in high formaldehyde emission, and releasing a large amount of free formaldehyde in the indoor closed environment, which is harmful to the human body.

Traditional activated carbon, bamboo charcoal and other materials have good adsorption capacity for non-polar or weakly polar molecules with large molecular weight, but the removal of small polar and strong polar pollutants such as formaldehyde is not satisfactory.

The state has forced the introduction of the CADR value of formaldehyde in air purifiers. After the CCM value is required, higher requirements are imposed on formaldehyde removal. Traditional indoor aldehyde removal coatings can only function in a large area, and it is difficult to achieve high CADR values and CCM values in such a small space of the air purifier filter material. Other applications such as photocatalysts, manganese dioxide, and precious metal catalysts have problems such as the need for light irradiation, low CADR values, and high cost, which are difficult to promote. The surface catalyzed aldehyde reaction of the powder greatly accelerates the fixation of formaldehyde, which not only solves the above problems, but also It is also extremely convenient to apply after being made into a coating. It is a new type of high performance aldehyde removal coating.

There are many different technologies and media in the air purifier that enable it to provide clean and safe air to the user. Commonly used air purification technologies include: adsorption technology, negative (positive) ion technology, catalytic technology, photocatalytic technology, superstructure photomineralization technology, HEPA high efficiency filtration technology, electrostatic dust collection technology, etc.; material technology mainly includes: photocatalyst, activated carbon, Synthetic fiber, HEAP high efficiency material, negative ion generator, etc. The existing air purifiers are mostly compounded, that is, a plurality of purification technologies and material media are simultaneously used.

Air purifiers are widely used in households, especially in the indoor environment after home decoration, there is a large amount of formaldehyde, dust, etc., which poses potential harm to the human body. The use of air purifiers can greatly shorten the emission time of harmful gases. However, in the process of use, since the filter screen of the air purifier is in direct contact with the outside air for a long time, the residual of harmful substances is easily generated on the surface of the filter screen, and the filter screen is disposed inside the device, which is difficult to clean, resulting in deposition of harmful substances. Filter the net, which in turn causes secondary pollution of indoor air. In the past, aldehyde-removing coatings were generally only suitable for indoor wall paints, and a large construction area was required to achieve better results.

Summary of the invention

The object of the present invention is to provide an effective solution for reducing the deposition of harmful substances, avoiding secondary pollution of indoor air by the air purifier during use, optimizing the air purification effect, and improving the use efficiency of the device to solve the problems raised in the above background art.

In order to achieve the above object, the present invention provides the following technical solution: a aldehyde-removing and anti-mold coating for a filter material, which is composed of the following components by weight: 50-65 parts of water, 10-15 parts of pseudo-boehmite, zeolite 10-15 parts of powder, thickener: sodium carboxymethyl cellulose 0.2-0.4 parts of self-crosslinking acrylic emulsion 5-8 parts, 4-7 parts of amine aldehyde removal agent, 3-5 parts of activated carbon or water-based color paste 5-7 parts, 0.5-0.7 parts of antibacterial agent.

Preferably, the pseudoboehmite is an aluminum hydroxide dry glue containing 400-800 mesh through holes.

Preferably, the zeolite powder is a natural mordenite or synthetic faujasite powder having a particle size of 400-800 mesh.

Preferably, the activated carbon has a particle size of from 600 to 800 mesh.

Preferably, the antibacterial agent is polyhexamethylene monophosphonium phosphate.

Preferably, the amine deacetalizer is 2-imidazolidinone.

Preferably, the self-crosslinking acrylic emulsion is a one-component thermally self-crosslinking acrylic emulsion.

The method for preparing the filter material for removing aldehyde and mildewproof paint comprises the following steps:

(1) mixing 15 parts of water with all activated carbon and antibacterial agent for 20 minutes to form a suspension;

(2) Stir the remaining water with pseudo-boehmite, white carbon black, add 2-imidazolidinone for 30-40 minutes, then add activated carbon antibacterial agent suspension for 3-7 minutes, then carboxymethyl fiber Sodium, stir for 5-8 minutes, and finally add the acrylic emulsion and stir evenly to prepare the coating;

(3) spraying or impregnating the prepared paint onto the air filter material, and drying the filter material at 80-110 ° C, so that the ordinary filter material has the effect of removing formaldehyde.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The invention effectively reduces the deposition of harmful substances, prevents the air purifier from polluting the indoor air twice during use, optimizes the air purification effect, and improves the equipment use efficiency. The invention imparts an excellent initial formaldehyde purification rate and a high cumulative purification amount to an activated carbon filter material or a common non-woven fabric and a paper substrate which do not have good formaldehyde purification ability, and increases the raw material cost. The spraying process is simple and the material added value is high.

(2) The aldehyde-free mildew-proof coating of the present invention has a low-density, high-specific surface area zeolite powder, and the pseudo-boehmite dry powder can uniformly load 2-imidazolidinone or other amine-containing compound to provide a large reaction area. It is easy to react with formaldehyde. The Lewis acid group on the surface of the zeolite and the pseudoboehmite catalyzes the condensation of the aldehyde amine, making the reaction more rapid. The amount of emulsion added is small, the amount of emulsion is rare, and it is not easy to form a film when it is dry. It forms a point bond after heating, and self-crosslinks. After curing, the coating layer is loose and porous, the gas is more easily penetrated, and is resistant to water. The prepared paint and color paste can have a plurality of colors, and the organic content is small, odorless, and the spray-drying process is simple.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described below. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The invention provides a technical solution: a aldehyde-removing and anti-mold coating for a filter material, which is composed of the following components by weight: 50-65 parts of water, 10-15 parts of pseudo-boehmite, zeolite powder 10-15 , thickener: sodium carboxymethyl cellulose 0.2-0.4 parts of self-crosslinking acrylic emulsion 5-8 parts, 4-7 parts of amine deacetal, 3-5 parts of activated carbon or 5-7 parts of aqueous paste , antibacterial agent 0.5-0.7 parts.

Among them, the pseudo-boehmite is 400-800 mesh, and the aluminum hydroxide dry glue containing the mesopores and large pores functions to adsorb the amine deodorant dispersed in water, thereby improving the surface area of the reaction and having a catalytic effect. 400-800 mesh zeolite powder is natural mordenite or synthetic faujasite Powder, role: adsorption of amine deodorizer dispersed in water, improve the surface area of the reaction, while having a catalytic effect. Activated carbon 600-800 mesh, role: coloring, antibacterial agent carrier. The antibacterial agent is polyhexamethylene monophosphonium phosphate. The amine deacetal is 2-imidazolidinone, which is inexpensive and odorless. The self-crosslinking acrylic emulsion is a one-component thermal self-crosslinking acrylic emulsion, which does not contain APEO, has a tg of about 25 degrees Celsius, does not form a film after curing at room temperature, forms a point bond after heating and self-crosslinks, so that the coating has water resistance.

In addition to the formaldehyde effect test, the substrate: 120X120X10mm, 5mm 楞 high activated carbon paper corrugated substrate, 20g.

In addition to aldehyde coatings,

2 cubic meters sealed experimental chamber, 12038 fan, 3000 rpm.

experimental method

The activated carbon corrugated substrate was dipped in the coating, weighed after drying, and the material was weighted to 32 g.

The activated carbon corrugated substrate or the corrugated after the coating is dried, and is fixed on the 12038 fan after regaining moisture.

Initial efficiency test: The formalin solution was injected onto the heating plate of the sealed test chamber to fill the chamber with formaldehyde gas, about 1.4 ± 0.1 ppm.

After the concentration is stable, turn on the fan, adjust to 3000±200 rpm, and record the data with a formaldehyde detector.

Cumulative Purification - Cycle Attenuation Experiment: In addition, 26 times the initial efficiency experiment of formalin was injected onto the sealed experimental chamber heating plate, and the fan was turned on to 3000 ± 200 rpm for 24 hours.

The attenuated experimental sample was taken out and allowed to stand at room temperature for 24 hours.

Attenuation efficiency experiment: The test was again performed under the initial efficiency condition, and the data was recorded with a formaldehyde detector.

Experimental data is as follows

Activated carbon substrate without coating

The initial efficiency of the loaded coating:

Attenuation efficiency of the loaded coating:

Advantages of the invention:

In the past, aldehyde-removing coatings were generally only suitable for indoor wall paints, and a large construction area was required to achieve better results.

The invention imparts an excellent initial formaldehyde purification rate and a high cumulative purification amount to an activated carbon filter material or a common non-woven fabric and a paper substrate which do not have good formaldehyde purification ability, increases the raw material cost, and has a simple spraying process and a material added value. high.

Low-density, high specific surface area zeolite powder, pseudo-boehmite dry powder can uniformly load 2-imidazolidinone or other amine-containing compounds, providing a large reaction area and easy to react with formaldehyde. The Lewis acid group on the surface of the zeolite and the pseudoboehmite catalyzes the condensation of the aldehyde amine, making the reaction more rapid. The amount of emulsion added is small, the amount of emulsion is rare, and it is not easy to form a film when it is dry. It forms a point bond after heating, and self-crosslinks. After curing, the coating layer is loose and porous, the gas is more easily penetrated, and is resistant to water. The prepared paint and color paste can have a plurality of colors, and the organic content is small and odorless. Spray-drying process is simple,

After actual measurement, the coating-coated corrugated filter material has a high formaldehyde removal rate and a high cumulative purification amount. Simple process, very suitable for indoor

While the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art And variants, the scope of the invention is attached The requirements and their equivalents are limited.

Claims

The invention relates to an aldehyde-removing and anti-mold coating for a filter material, which is characterized by comprising the following components by weight: 50-65 parts of water, 10-15 parts of pseudoboehmite, 10-15 parts of zeolite powder, thickening Agent: sodium carboxymethyl cellulose 0.2-0.4 parts of self-crosslinking acrylic emulsion 5-8 parts, 4-7 parts of amine deacetal, 3-5 parts of activated carbon or 5-7 parts of aqueous paste, antibacterial agent 0.5 -0.7 parts.
The aldehyde-free mold-proof coating for a filter material according to claim 1, wherein the pseudo-boehmite is an aluminum hydroxide dry glue containing 400-800 mesh through holes.
The aldehyde-removing and anti-mold coating for a filter according to claim 1, wherein the zeolite powder is a natural mordenite or a synthetic faujasite powder having a particle size of 400 to 800 mesh.
The aldehyde-free mold-proof coating for a filter material according to claim 1, wherein the activated carbon has a particle size of 600 to 800 mesh.
The aldehyde-free mold-proof coating for a filter material according to claim 1, wherein the antibacterial agent is polyhexamethylene monophosphonium phosphate.
The aldehyde-removing and anti-mold coating for a filter according to claim 1, wherein the amine-based aldehyde removing agent is 2-imidazolidinone.
The aldehyde-free mold-proof coating for a filter material according to claim 1, wherein the self-crosslinking acrylic emulsion is a one-component heat self-crosslinking acrylic emulsion.
A method for preparing an aldehyde-free mold-proof coating for a filter material according to claim 1, comprising the steps of:

(1) mixing 15 parts of water with all activated carbon and antibacterial agent for 20 minutes to form a suspension;

(2) stirring the remaining water with pseudo-boehmite, white carbon black, and adding 2-imidazolidine Ketone stirring for 30-40 minutes, then adding activated carbon antibacterial agent suspension for 3-7 minutes, then sodium carboxymethyl cellulose, stirring for 5-8 minutes, and finally adding acrylic emulsion to stir evenly to obtain the coating;

(3) Spraying or dipping the prepared paint onto the air filter material, and drying the filter material at 80-110 ° C, so that the ordinary filter material has the effect of removing formaldehyde.