CN108373715B

CN108373715B - Coating with formaldehyde purification function and preparation method thereof

Info

Publication number: CN108373715B
Application number: CN201610901436.7A
Authority: CN
Inventors: 秦素洁
Original assignee: 秦素洁
Current assignee: SUZHOU MAIMAOSI SENSOR TECHNOLOGY Co.,Ltd.
Priority date: 2016-10-17
Filing date: 2016-10-17
Publication date: 2020-06-23
Anticipated expiration: 2036-10-17
Also published as: CN108373715A

Abstract

The invention belongs to the technical field of air purification, and relates to a coating with a formaldehyde purification function and a preparation method thereof. Specifically, the coating comprises the following components in parts by weight: 1-3.4 parts of formaldehyde purifying agent, 3-13 parts of base material, 0.05-0.1 part of defoaming agent, 0.05-0.1 part of flatting agent and 0.01-0.05 part of pH regulator, wherein: the formaldehyde purifying agent comprises the following components in parts by weight: 1-13 parts of polyvinylpyrrolidone, 1-10 parts of water-soluble macromolecular compound, 4-42 parts of chiral amino alcohol, 1-7 parts of titanium dioxide, 1-7 parts of stannic oxide, 1-7 parts of silicon dioxide, 2-6 parts of magnesium oxide, 1-13 parts of activated carbon, 1-9 parts of soluble weak acid salt and 500-800 parts of solvent. The coating disclosed by the invention can be used for quickly, stably and efficiently purifying formaldehyde, the raw materials are cheap and easy to obtain, and the process is simple, convenient and feasible, and is suitable for large-scale popularization and application.

Description

Coating with formaldehyde purification function and preparation method thereof

Technical Field

The invention belongs to the technical field of air purification, and relates to a coating with a formaldehyde purification function and a preparation method thereof.

Background

Formaldehyde is a protoplasm toxic substance and can be combined with amino in protein to generate formylated protein. The influence of formaldehyde on human health comprises abnormal smell, respiratory tract irritation, abnormal lung function, central nervous system influence, abnormal immune function and damage to intracellular genetic materials, and the harm is serious and unappreciable. Therefore, the concentration of formaldehyde in the indoor air cannot be more than 0.08mg/m according to the national standard³While the concentration of formaldehyde in the air of public places is not more than 0.12mg/m³。

At present, indoor formaldehyde pollution becomes the most main indoor air pollution problem in China and seriously harms the life health of people. In daily life, the coating is widely applied to decoration processes, most of the existing common coatings can release harmful substances such as formaldehyde and the like, and the health of the indoor environment cannot be guaranteed.

The method for treating formaldehyde pollution has become one of the hot spots in environmental pollution treatment research, and researchers have proposed various methods for treating formaldehyde pollution, including ventilation, plant purification, physical adsorption, and the like. However, the existing methods can not solve the problem of formaldehyde pollution quickly, efficiently and thoroughly. As a hidden killer in daily life of people, formaldehyde increasingly seriously harms the health of human bodies, and the common physical formaldehyde removal methods such as dilution, adsorption and the like cannot meet the requirements of people on the indoor air quality. Therefore, the research on a novel coating capable of efficiently and rapidly purifying formaldehyde is a problem to be solved urgently at present.

Chinese patent CN 102002290A discloses a formaldehyde-resistant interior wall coating, wherein the functional material is diatomite with a porous structure, but the functional material can only realize the adsorption of formaldehyde and cannot achieve the purpose of elimination. Chinese invention patent CN 104629516 a discloses a coating capable of removing formaldehyde, wherein the formaldehyde removing component is a disubstituted enol, which can adsorb formaldehyde through hydrogen bond association or remove formaldehyde through reaction of enol hydroxyl and formaldehyde, but the hydrogen bond association is weak and is easily affected by external environment, and the stability is poor, so that adsorbed formaldehyde is desorbed to cause secondary pollution, while the reaction of enol hydroxyl and formaldehyde is usually performed in alkaline environment, and on the premise that no alkaline substance is provided in the coating and carbon dioxide is contained in the air, the reaction cannot be continuously performed, and further, the long-acting purification effect of formaldehyde is affected. The invention patent CN 104845481A discloses a formaldehyde-removing environment-friendly coating, wherein a formaldehyde trapping agent is a 2-imidazolidinone compound, the compound has a not ideal formaldehyde removing effect, cannot meet the requirement of long-acting and efficient formaldehyde absorption, has an irritation effect on eyes, skin, mucous membranes (such as respiratory mucosa) and the like, and can pose a potential threat to human health if not used properly.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a coating which is quick, efficient, stable and free of secondary pollution risk and has a formaldehyde purification function and a preparation method thereof.

Specifically, the invention adopts the following technical scheme:

a coating with a formaldehyde purification function comprises the following components in parts by weight: 1-3.4 parts of formaldehyde purifying agent, 3-13 parts of base material, 0.05-0.1 part of defoaming agent, 0.05-0.1 part of flatting agent and 0.01-0.05 part of pH regulator.

In the coating with the formaldehyde purifying function, the formaldehyde purifying agent consists of the following components in parts by weight: 1-13 parts of polyvinylpyrrolidone, 1-10 parts of water-soluble macromolecular compound, 4-42 parts of chiral amino alcohol, 1-7 parts of titanium dioxide, 1-7 parts of stannic oxide, 1-7 parts of silicon dioxide, 2-6 parts of magnesium oxide, 1-13 parts of activated carbon, 1-9 parts of soluble weak acid salt and 500-800 parts of solvent.

Preferably, the formaldehyde scavenger consists of the following components in parts by weight: 2-10 parts of polyvinylpyrrolidone, 2-8 parts of water-soluble macromolecular compound, 10-30 parts of chiral amino alcohol, 1-4 parts of titanium dioxide, 1-4 parts of stannic oxide, 1-4 parts of silicon dioxide, 3-5 parts of magnesium oxide, 3-10 parts of activated carbon, 2-5 parts of soluble weak acid salt and 550-700 parts of solvent.

More preferably, the formaldehyde scavenger consists of the following components in parts by weight: 5 parts of polyvinylpyrrolidone, 4 parts of water-soluble macromolecular compound, 20 parts of chiral amino alcohol, 1 part of titanium dioxide, 1 part of tin dioxide, 1 part of silicon dioxide, 4 parts of magnesium oxide, 6 parts of activated carbon, 4 parts of soluble weak acid salt and 600 parts of solvent.

In the formaldehyde scavenger, the water-soluble polymer compound is selected from any one of polyethylene glycol (PEG), Polyacrylamide (PAM), polyacrylic acid (PAA), carboxymethyl cellulose (CMC), polyethylene oxide (PEO), polyvinyl alcohol (PVA), and polymethacrylic acid (PMAA), or a mixture thereof in any proportion.

In the formaldehyde purifying agent, the chiral amino alcohol is a racemate formed by mixing two kinds of enantiomer molecules in an equimolar mode, and is selected from any one of 1, 2-dimethylaminoethanol, 2, 3-dimethylaminopropanol, 1, 2-diethylaminoethanol, 1, 2-diphenylaminoethanol, 1,2, 2-triphenyl-1, 2-diaminoethanol, 2, 2-diethyl-1, 2-diaminoethanol and N-methyl-N-ethylaminotributyl alcohol or a mixture of the two enantiomers in any proportion, and the structural formula is shown as follows.

In the formaldehyde scavenger, the soluble weak acid salt is alkaline after ionization, and is selected from any one of carbonate, bicarbonate, sulfite, silicate and saturated monocarboxylic acid salt or a mixture thereof in any proportion.

In the above formaldehyde scavenger, the solvent may be either an inorganic solvent or an organic solvent; when the solvent is an inorganic solvent, water is preferred; when the solvent is an organic solvent, ethanol is preferred.

The coating with the formaldehyde purification function comprises various forms of latex paint, printing ink and the like. When the coating is emulsion paint, the base material is water base material selected from any one of water polyurethane resin, water acrylic resin, water epoxy resin, water silicone acrylic resin and water fluorocarbon resin or mixture of any proportion thereof.

In the coating material with formaldehyde purification function, the defoaming agent is selected from any one of emulsified silicone oil, high alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane or a mixture of any proportion thereof.

In the coating with formaldehyde purification function, the leveling agent is selected from any one of an acrylate leveling agent, an organic silicon leveling agent (such as silicone oil, polydimethylsiloxane, polyether polyester modified organic siloxane and alkyl modified organic siloxane) and a fluorocarbon leveling agent or a mixture of the two in any proportion.

In the coating with formaldehyde purification function, the pH regulator is selected from any one of 2-amino-2-methyl-1-propanol, N-methylethanolamine and N, N-dimethylethanolamine or a mixture of the two in any proportion.

A preparation method of a coating with a formaldehyde purification function comprises the following steps:

1) adding polyvinylpyrrolidone with a formula amount into a solvent with a formula amount, stirring at 20-85 ℃ to dissolve the polyvinylpyrrolidone, adding a water-soluble high molecular compound with a formula amount, and continuously stirring at a constant temperature to dissolve the water-soluble high molecular compound to obtain a solution A;

2) mixing titanium dioxide, tin dioxide, silicon dioxide, magnesium oxide, activated carbon, soluble weak acid salt and chiral amino alcohol according to the formula ratio to obtain a mixture B;

3) adding the mixture B obtained in the step 2) into the solution A obtained in the step 1), uniformly dispersing in a stirring or ultrasonic vibration mode to obtain a mixture C, and filtering through a 200-300-mesh filter screen to obtain a formaldehyde purifying agent;

4) adding the formaldehyde purifying agent obtained in the step 3) into a base material with a formula amount, dispersing at a rotating speed of 1000-1500 rpm, adding a defoaming agent with the formula amount in the dispersing process, then increasing the rotating speed to 4000-5500 rpm, continuously dispersing for 30-60 minutes, then reducing the rotating speed to 1000-1500 rpm, adding a leveling agent with the formula amount, continuously dispersing for 10-30 minutes, finally adding a pH regulator with the formula amount, uniformly dispersing, enabling the pH value of the system to reach 7-11.5, and filtering through a 200-300-mesh filter screen to obtain the coating with the formaldehyde purifying function.

In the above preparation method, the stirring is performed by a mechanical stirring device or a magnetic stirring device.

In the above production method, the dispersion is carried out by a high-speed disperser.

In the coating with the formaldehyde purification function, the activated carbon is used as an adsorption carrier in the formaldehyde purification agent due to the high chemical stability and large specific surface area; the chiral amino alcohol can perform aldol condensation reaction with formaldehyde under the alkaline and/or catalytic condition, thereby achieving the effect of purifying formaldehyde; the magnesium oxide can absorb water and carbon dioxide in the air to generate basic magnesium carbonate, so that an alkaline environment is provided for aldol condensation reaction, and the solid state of the composite material cannot be influenced after the magnesium oxide absorbs moisture; titanium dioxide, tin dioxide, silicon dioxide and the like are used as catalysts due to the catalytic performance of the titanium dioxide, the tin dioxide, the silicon dioxide and the like, so that the efficiency of aldol condensation reaction is improved, and the formaldehyde removal capability of the composite material is enhanced; as a binder, polyvinylpyrrolidone and a water-soluble polymer can combine the components together in a uniform and stable manner, and promote the efficient reaction of the formaldehyde purifying agent and formaldehyde.

Compared with the prior art, the coating with the formaldehyde purification function can realize the rapid adsorption of formaldehyde, can eliminate the formaldehyde through chemical reaction, avoids the risk of secondary pollution, and has the characteristics of rapidness, stability and high efficiency in the whole purification process. In addition, the production raw materials for preparing the coating are cheap and easy to obtain, the preparation process is simple and easy to implement, and the coating is suitable for large-scale popularization and application and has great market prospect.

Drawings

FIG. 1 is a schematic diagram showing the effect of purifying formaldehyde in air by using the coating product of the present invention.

Detailed Description

The technical solution of the present invention will be further described with reference to the accompanying drawings and specific embodiments. Unless otherwise indicated, the instruments, materials, reagents and the like used in the following examples are all available by conventional commercial means.

Example 1: and (3) preparing the coating with the formaldehyde purification function.

1) Adding 1g of polyvinylpyrrolidone into 500g of deionized water, mechanically stirring at 80 ℃ to dissolve the polyvinylpyrrolidone, adding 1g of polyacrylamide, and continuously stirring at constant temperature to dissolve the polyacrylamide to obtain a solution A;

2) mixing 1g of titanium dioxide, 1g of tin dioxide, 1g of silicon dioxide, 2g of magnesium oxide, 1g of activated carbon, 1g of sodium carbonate and 4g of 1, 2-dimethylaminoethanol to obtain a mixture B;

3) adding the mixture B obtained in the step 2) into the solution A obtained in the step 1), uniformly dispersing in a mechanical stirring manner to obtain a mixture C, and filtering by using a 200-mesh filter screen to obtain a formaldehyde purifying agent;

4) adding the formaldehyde purifying agent obtained in the step 3) into 1.8kg of water-based silicone-acrylic resin, dispersing at the rotating speed of 1500rpm, adding 30g of emulsified silicone oil in the dispersing process, then increasing the rotating speed to 5500rpm, continuing to disperse for 30 minutes, then reducing the rotating speed to 1500rpm, adding 30g of acrylate flatting agent 837, continuing to disperse for 30 minutes, finally adding 6g of 2-amino-2-methyl-1-propanol, after uniform dispersion, enabling the pH value of the system to reach 8, and filtering through a 200-mesh filter screen to obtain the coating with the formaldehyde purifying function.

Example 2: and (3) preparing the coating with the formaldehyde purification function.

1) Adding 13g of polyvinylpyrrolidone into 6.5kg of absolute ethyl alcohol, mechanically stirring at 60 ℃ to dissolve the polyvinylpyrrolidone, adding 10g of polyethylene oxide, and continuously stirring at constant temperature to dissolve the polyethylene oxide to obtain a solution A;

2) mixing 7g of titanium dioxide, 6g of tin dioxide, 5g of silicon dioxide, 6g of magnesium oxide, 13g of activated carbon, 9g of sodium bicarbonate and 42g of 1, 2-diethylaminoethanol to obtain a mixture B;

3) adding the mixture B obtained in the step 2) into the solution A obtained in the step 1), uniformly dispersing in a mechanical stirring manner to obtain a mixture C, and filtering by using a 300-mesh filter screen to obtain a formaldehyde purifying agent;

4) adding the formaldehyde purifying agent obtained in the step 3) into 5.5kg of water-based acrylic resin, dispersing at the rotating speed of 1000rpm, adding 400g of polydimethylsiloxane in the dispersing process, then increasing the rotating speed to 4000rpm, continuing to disperse for 30 minutes, then reducing the rotating speed to 1000rpm, adding 400g of acrylate flatting agent 837, continuing to disperse for 30 minutes, finally adding 80g N-methylethanolamine, after uniform dispersion, enabling the pH value of the system to reach 8.5, and filtering through a 300-mesh filter screen to obtain the coating with the formaldehyde purifying function.

Example 3: and (3) preparing the coating with the formaldehyde purification function.

1) Adding 2g of polyvinylpyrrolidone into 1.6kg of deionized water, magnetically stirring at 25 ℃ to dissolve the polyvinylpyrrolidone, adding 2g of polymethacrylic acid, and continuously stirring at constant temperature to dissolve the polymethacrylic acid to obtain a solution A;

2) mixing 4g of titanium dioxide, 4g of tin dioxide, 4g of silicon dioxide, 3g of magnesium oxide, 3g of activated carbon, 2g of sodium sulfite and 10g of 1,2, 2-triphenyl-1, 2-diaminoethanol to obtain a mixture B;

3) adding the mixture B obtained in the step 2) into the solution A obtained in the step 1), uniformly dispersing in a magnetic stirring manner to obtain a mixture C, and filtering by using a 200-mesh filter screen to obtain a formaldehyde purifying agent;

4) adding the formaldehyde purifying agent obtained in the step 3) into 5kg of water-based epoxy resin, dispersing at the rotating speed of 1200rpm, adding 25g of polyoxypropylene glycerol ether in the dispersing process, then increasing the rotating speed to 5000rpm, continuing to disperse for 30 minutes, then reducing the rotating speed to 1200rpm, adding 25g of acrylate flatting agent 837, continuing to disperse for 30 minutes, finally adding 25g of N, N-dimethylethanolamine, uniformly dispersing, enabling the pH value of the system to reach 10, and filtering through a 200-mesh filter screen to obtain the coating with the formaldehyde purifying function.

Example 4: and (3) preparing the coating with the formaldehyde purification function.

1) Adding 10g of polyvinylpyrrolidone into 6kg of absolute ethyl alcohol, magnetically stirring at 40 ℃ to dissolve the polyvinylpyrrolidone, adding 8g of carboxymethyl cellulose, and continuously stirring at constant temperature to dissolve the carboxymethyl cellulose to obtain a solution A;

2) mixing 3g of titanium dioxide, 4g of tin dioxide, 5g of silicon dioxide, 5g of magnesium oxide, 10g of activated carbon, 5g of sodium silicate, 10g of 1,2, 2-triphenyl-1, 2-diaminoethanol and 20g of 2, 3-dimethylaminopropanol to obtain a mixture B;

3) adding the mixture B obtained in the step 2) into the solution A obtained in the step 1), uniformly dispersing in a magnetic stirring manner to obtain a mixture C, and filtering by using a 300-mesh filter screen to obtain a formaldehyde purifying agent;

4) adding the formaldehyde purifying agent obtained in the step 3) into 12kg of water-based epoxy resin, dispersing at the rotating speed of 1400rpm, adding 100g of polyoxyethylene polyoxypropylene ether in the dispersing process, then increasing the rotating speed to 4800rpm, continuing to disperse for 30 minutes, then reducing the rotating speed to 1400rpm, adding 100g of acrylate flatting agent 837, continuing to disperse for 30 minutes, finally adding 50g N-methylethanolamine, after uniform dispersion, enabling the pH value of the system to reach 9.5, and filtering through a 300-mesh filter screen to obtain the coating with the formaldehyde purifying function.

Example 5: and (3) preparing the coating with the formaldehyde purification function.

1) Adding 5g of polyvinylpyrrolidone into 3kg of deionized water, mechanically stirring at 80 ℃ to dissolve the polyvinylpyrrolidone, adding 2g of polyacrylic acid and 2g of polyethylene glycol, and continuously stirring at constant temperature to dissolve the polyacrylic acid to obtain a solution A;

2) mixing 2g of titanium dioxide, 2g of tin dioxide, 2g of silicon dioxide, 4g of magnesium oxide, 6g of activated carbon, 4g of sodium acetate, 5g of 1, 2-dimethylaminoethanol and 15g N-methyl-N-ethylaminotributyl alcohol to obtain a mixture B;

4) adding the formaldehyde purifying agent obtained in the step 3) into 4kg of waterborne polyurethane resin, dispersing at the rotating speed of 1500rpm, adding 50g of emulsified silicone oil in the dispersing process, then increasing the rotating speed to 5500rpm, continuing to disperse for 30 minutes, then reducing the rotating speed to 1500rpm, adding 50g of acrylate flatting agent 837, continuing to disperse for 30 minutes, finally adding 25g of 2-amino-2-methyl-1-propanol, after uniform dispersion, enabling the pH value of the system to reach 8.5, and filtering through a 200-mesh filter screen to obtain the coating with the formaldehyde purifying function.

Example 6: the formaldehyde purification effect of the coating is tested.

The coatings in examples 1 to 5 were respectively coated on a 30cmx30cm wood board, and dried to obtain a test sample (thickness 3mm), and meanwhile, the aldehyde-removing product was prepared according to the method described in CN 104845481 a, and also coated on a 30cmx30cm wood board, and dried to obtain a parallel control (thickness 3 mm).

Respectively placing the wood boards coated with the formaldehyde removal products at the central positions of a closed experimental device, immediately closing a device door after adding 3.3 mul of 30% formaldehyde liquid, opening a heating table, starting a fan for stirring, uniformly distributing formaldehyde gas in the whole experimental device, simultaneously recording the concentration of the formaldehyde gas in the experimental device in real time by using a formaldehyde sensor, and calculating the formaldehyde removal rate (%) according to the following formula: formaldehyde removal rate ═ C₀-C_t)/C₀× 100% of C₀As an initial content, C_tThe corresponding experimental results are shown in fig. 1 for the real-time content at a certain time.

As can be seen from figure 1, the curve of the existing product for removing formaldehyde is basically linear, and shows a situation of uniform removal along with the time, and the formaldehyde removal rate can reach about 13% when the experimental time is 40 minutes. Compared with the prior art, the coating can reach a formaldehyde removal rate of more than 80 percent within 2 to 6 minutes of the first experiment. Therefore, the coating of the invention has the function of quickly and efficiently purifying formaldehyde. In addition, the coating can be used for formaldehyde purification in the day and at night, can exert the effect without depending on the existence of titanium dioxide and other photocatalysts, has long duration, and has the technical problems that the raw materials are non-toxic and harmless to the body, secondary pollution cannot be caused, and the like.

Claims

1. A coating with a formaldehyde purification function comprises the following components in parts by weight: 1-3.4 parts of formaldehyde purifying agent, 3-13 parts of base material, 0.05-0.1 part of defoaming agent, 0.05-0.1 part of flatting agent and 0.01-0.05 part of pH regulator; wherein:

the formaldehyde purifying agent comprises the following components in parts by weight: 1-13 parts of polyvinylpyrrolidone, 1-10 parts of water-soluble macromolecular compound, 4-42 parts of chiral amino alcohol, 1-7 parts of titanium dioxide, 1-7 parts of stannic oxide, 1-7 parts of silicon dioxide, 2-6 parts of magnesium oxide, 1-13 parts of activated carbon, 1-9 parts of soluble weak acid salt and 500-800 parts of solvent;

the chiral amino alcohol is selected from any one of 1, 2-dimethylaminoethanol, 2, 3-dimethylaminopropanol, 1, 2-diethylaminoethanol, 1, 2-diphenylaminoethanol, 1,2, 2-triphenyl-1, 2-diaminoethanol and 2, 2-diethyl-1, 2-diaminoethanol or a mixture of any proportion thereof;

the soluble weak acid salt is selected from any one of carbonate, bicarbonate, sulfite, silicate and saturated monocarboxylic acid salt or a mixture of the carbonate, the bicarbonate, the sulfite, the silicate and the saturated monocarboxylic acid salt in any proportion.

2. The coating with formaldehyde-purifying function according to claim 1, characterized in that:

the water-soluble high molecular compound is selected from any one of polyethylene glycol, polyacrylamide, polyacrylic acid, carboxymethyl cellulose, polyethylene oxide, polyvinyl alcohol and polymethacrylic acid or a mixture of any proportion thereof.

3. The coating with formaldehyde-purifying function according to claim 1, characterized in that:

the solvent is water or ethanol.

4. The coating with formaldehyde-purifying function according to claim 1, characterized in that:

the base material is selected from any one of water-based polyurethane resin, water-based acrylic resin, water-based epoxy resin, water-based silicone-acrylic resin and water-based fluorocarbon resin or a mixture of the water-based urethane resin, the water-based acrylic resin, the water-based epoxy resin, the water-based silicone-acrylic resin and the water-based fluorocarbon resin in any proportion.

5. The coating with formaldehyde-purifying function according to claim 1, characterized in that:

the defoaming agent is selected from any one of emulsified silicone oil, a higher alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane or a mixture of the polyoxyethylene glycerol ether and the polydimethylsiloxane in any proportion;

the leveling agent is selected from any one of an acrylate leveling agent, an organic silicon leveling agent and a fluorocarbon leveling agent or a mixture of the organic silicon leveling agent and the fluorocarbon leveling agent in any proportion;

the pH regulator is selected from any one of 2-amino-2-methyl-1-propanol, N-methylethanolamine and N, N-dimethylethanolamine or a mixture of the two in any proportion.

6. A method for preparing the coating with formaldehyde-purifying function according to any one of claims 1 to 5, comprising the steps of:

7. The method of claim 6, wherein:

the stirring is accomplished by a mechanical stirring device or a magnetic stirring device.

8. The method of claim 6, wherein:

the dispersion is accomplished by a high speed disperser.