Environment-friendly water-based paint for removing formaldehyde and preparation method of environment-friendly water-based paint

Abstract

The invention discloses environment-friendly water-based paint for removing formaldehyde and a preparation method of the environment-friendly water-based paint. A nanoscale formaldehyde-removing functional material is added into the water-based paint, so that free formaldehyde in furniture boards and air is decomposed; according to the environment-friendly water-based paint, pure water is used as a solvent, benzene series and TVOC are not generated, free formaldehyde in artificial boards is eliminated, and pollution of the benzene series and the TVOC is avoided. After an artificial board is coated with the environment-friendly water-based paint, the formaldehyde removal rate is 77.8-90.5%; after the formaldehyde is introduced for 48 hours, the removal rate of the formaldehyde is 76.3-88.1%; after the E1-grade artificial board is coated with the environment-friendly water-based paint, the E0-grade standard can be met, it is guaranteed that the concentration of formaldehyde in indoor air meets the national specified indoor formaldehyde concentration limiting value requirement, modulation through a diluent and the like is not needed in the using process, formaldehyde removing and paint brushing can be completed at a time, working hours are saved, cost is reduced, and the environment-friendly water-based paint has good application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to an environmentally friendly water-based paint for removing formaldehyde and a preparation method thereof. Background Art

[0002] At present, in the field of residential decoration, harmful substances such as formaldehyde, benzene, and total volatile organic compounds (TVOC) released by various decoration materials have seriously affected the daily lives of residents. Long-term exposure to indoor environments containing harmful substances such as formaldehyde will expose the human body to various health risks, and in severe cases, may even endanger life safety. Therefore, it is very important to manage the indoor air quality of renovated living spaces and newly purchased furniture. This process aims to effectively eliminate harmful gases released by new furniture and decoration materials, ensure that the concentration of harmful substances in the room is controlled within the range that meets human health standards, and thus protect the health and well-being of residents.

[0003] Indoor air pollution in renovated living spaces and newly purchased furniture mainly comes from two sources of pollutant emissions: first, the finishing materials used for decoration or furniture surfaces, including common wall coatings and paints on furniture surfaces, which often contain benzene compounds and total volatile organic compounds (TVOC), which are known pollutants that are harmful to human health; second, adhesives used to bond different materials are also an important source of pollution. These adhesives release harmful gases during the curing process, which has an adverse effect on indoor air quality.

[0004] In response to the problem of pollutants in surface coating materials, the industry has turned to environmentally friendly coatings as a solution, such as pollution-free wall coatings and water-based paints used for wood surface treatment. The research and development and application of these environmentally friendly coatings have reached a level of being basically non-toxic and pollution-free. Take a Chinese invention patent with application number 200410075486.1 and application date of December 14, 2004 as an example. The patent is called "Water-based wood paint with bactericidal, antibacterial and air-purifying functions". Its innovation lies in providing a water-based paint that has bactericidal and antibacterial functions and can effectively purify the air. Furniture painted with this water-based paint can effectively avoid the pollution of indoor air by harmful gases such as benzene and total volatile organic compounds (TVOC) contained in traditional paints, thereby showing excellent indoor environmental protection performance.

[0005] At present, the pollutants in adhesives, especially formaldehyde, have not been completely removed according to the existing technology. However, by accurately controlling the amount of harmful substances and adopting optimized production processes, the content and release of toxic and harmful substances such as formaldehyde can be reduced to the lowest level. In terms of removing indoor harmful gases, one of the commonly used methods is to use formaldehyde removers to degrade formaldehyde pollutants in the indoor environment. For example, a Chinese invention patent with application number 01133329 and application date October 23, 2001, introduces a product called "formaldehyde remover". The remover is an aqueous solution composed of triethanolamine, sodium metabisulfite, disodium ethylenediaminetetraacetic acid, 2,3,4,5,6-pentahydroxyacetaldehyde and distilled water. The application method of the formaldehyde remover is indoor spraying. However, given that the release of formaldehyde in indoor furniture is a continuous and slow process, and spraying can only provide a short-term effect, in order to effectively reduce the formaldehyde concentration, it is necessary to spray repeatedly for a long time. This method is not only cumbersome to operate, but also has unsatisfactory actual effect.

[0006] Conventional water-based paint applied to the surface of wood has a certain effect of blocking formaldehyde release, but its sealing efficiency is limited. For artificial boards painted with water-based paint, the formaldehyde release can be reduced by about 20%. E0-grade artificial boards painted with environmentally friendly water-based paint can ensure that the concentration of formaldehyde in indoor air is within a safe level to a certain extent. However, in order to ensure the health and safety of the indoor environment, the concentration of toxic and harmful substances such as formaldehyde, benzene, TVOC, etc. released by decoration materials and furniture must be lower than the environmental protection standard limit. Although the application of environmentally friendly water-based paint has a certain mitigating effect, since a large amount of formaldehyde is still released into the air, other alternative measures must be explored and taken to effectively solve this problem. Summary of the invention

[0007] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0008] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0009] Therefore, the purpose of the present invention is to overcome the deficiencies in the prior art and provide an environmentally friendly water-based paint for removing formaldehyde, wherein, based on the mass fraction of the environmentally friendly water-based paint raw materials, the paint comprises:

[0010] 40-45 parts of polymer emulsion, 28-35 parts of functional pigments and fillers, 0.4-0.6 parts of dispersants, 0.5-0.7 parts of wetting and flattening agents, 0.4-0.6 parts of thixotropic agents, 0.1-0.4 parts of antifoaming agents, 0.1-0.4 parts of defoaming agents, 0.07-0.14 parts of thickeners, 2.2-6 parts of wax emulsions, 0.01-0.09 parts of nano-grade formaldehyde removal functional materials, and 14-20 parts of deionized water;

[0011] Wherein, the nano-scale formaldehyde removal functional material includes one or both of Pt@ZIF-8 and platinum nanoparticles, and the particle size of the nano-scale formaldehyde removal functional material is 1 to 3 nm.

[0012] As a preferred embodiment of the environmentally friendly water-based paint for removing formaldehyde described in the present invention, the dispersant includes one or more of an organic phosphate dispersant, a polyvinyl alcohol dispersant, and a polycarboxylic acid dispersant.

[0013] As a preferred embodiment of the environmentally friendly water-based paint for removing formaldehyde described in the present invention, the defoaming agent includes one or more of alcohol defoaming agents, ether defoaming agents, phosphate defoaming agents, and silicone defoaming agents; the antifoaming agent includes one or more of polyether antifoaming agents, silicone antifoaming agents, and high molecular polymer antifoaming agents.

[0014] As a preferred embodiment of the environmentally friendly water-based paint for removing formaldehyde described in the present invention, the wetting and flattening agent includes one or more of HY-5030 wetting agent, HY-5057 wetting agent, and HY-6086 wetting agent.

[0015] As a preferred embodiment of the environmentally friendly water-based paint for removing formaldehyde described in the present invention, the thixotropic agent includes one or both of Attagel 50 and AQ-600.

[0016] As a preferred embodiment of the environmentally friendly water-based paint for removing formaldehyde described in the present invention, the thickener includes one or more of a cellulose thickener, a polyacrylate thickener, and an associative polyurethane thickener.

[0017] As a preferred embodiment of the environmentally friendly water-based paint for removing formaldehyde described in the present invention, the wax emulsion includes one or both of polyacrylate wax emulsion and polyurethane wax emulsion.

[0018] As a preferred embodiment of the environmentally friendly water-based paint for removing formaldehyde described in the present invention, the functional pigments and fillers include one or more of calcium carbonate, titanium dioxide, and lead powder, and the polymer emulsion is one or both of water-based acrylic emulsion and water-based polyurethane emulsion.

[0019] Another object of the present invention is to overcome the deficiencies in the prior art and provide a method for preparing the environmentally friendly water-based paint for removing formaldehyde.

[0020] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0021] The dispersant, part of the antifoaming agent, part of the defoaming agent, the wetting and flattening agent, the thixotropic agent, the wax emulsion and deionized water are mixed and stirred to prepare a mixed solution I;

[0022] Adding polymer emulsion and functional pigments and fillers into the mixed solution I, stirring and dispersing to obtain a slurry;

[0023] Nano-scale formaldehyde removal functional material, remaining antifoaming agent and remaining defoaming agent are added to the slurry, stirred, and a thickener is added, stirred evenly to obtain an environmentally friendly water-based paint.

[0024] As a preferred embodiment of the method for preparing the formaldehyde-removing environmentally friendly water-based paint of the present invention, the amount of the antifoaming agent in the mixed solution I is 1 / 3 to 1 / 2 of the total amount of the antifoaming agent, and the amount of the defoaming agent is 1 / 3 to 1 / 2 of the total amount of the defoaming agent.

[0025] Beneficial effects of the present invention:

[0026] (1) The present invention adds nano-scale formaldehyde removal functional materials to the water-based paint, which can decompose free formaldehyde in furniture boards and the air; the environmentally friendly water-based paint uses pure water as a solvent and does not produce benzene and TVOC produced by ordinary paints. It can not only eliminate free formaldehyde in artificial boards, but also avoid pollution from benzene and TVOC.

[0027] (2) After the environmentally friendly water-based paint of the present invention is applied to the artificial board, the formaldehyde removal rate is 77.8-90.5%; after the formaldehyde is introduced for 48 hours, the formaldehyde removal rate of the environmentally friendly water-based paint applied to the artificial board is 76.3-88.1%; after the environmentally friendly water-based paint is applied to the surface of the E1-grade artificial board, it can reach the E0-grade standard, ensuring that the concentration of formaldehyde in the indoor air meets the national indoor formaldehyde concentration limit requirements. The environmentally friendly water-based paint of the present invention can effectively absorb and decompose to remove excess formaldehyde gas in the environment, ensuring a fresh indoor environment after decoration.

[0028] (3) The environmentally friendly water-based paint of the present invention can remove formaldehyde at room temperature, is non-toxic and harmless, has excellent washability and stain resistance, and is easy to construct. After using the environmentally friendly water-based paint of the present invention for interior decoration, harmful gases can be reduced to a minimum, meeting the requirements of the indoor environment, and no diluent or the like is required for preparation during use. The method of use is simple, and formaldehyde removal and paint application can be completed in one step, eliminating the cumbersome process of first spraying a formaldehyde remover on ordinary oil-based paint and then applying paint after drying, thereby saving work time and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0030] Figure 1 This is a schematic diagram of the nanoscale formaldehyde removal functional material in Example 1 of the present invention. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] The Pt@ZIF-8 used in the present invention is synthesized according to the following method:

[0035] 205.0 mg 2-methylimidazole was dissolved in 75 mL methanol under magnetic stirring, and the concentration of 2-methylimidazole was 0.33 mol / L. 744.0 mg Zn(NO3)2·6H2O was weighed and dissolved in 80 mL methanol under magnetic stirring, and the molar ratio of 2-methylimidazole to Zn(NO3)2·6H2O was 1:1. The above two solutions were mixed evenly under magnetic stirring, allowed to stand at 4°C for 60 minutes, centrifuged, washed twice with methanol, and the sample was dried in vacuum at 60°C overnight to obtain ZIF-8;

[0036] 200.0 mg ZIF-8 was weighed and dispersed in 50 mL methanol under magnetic stirring. The concentration of ZIF-8 was 4 g / L. 50.0 mg chloroplatinic acid hexahydrate was added and stirred at room temperature for 2 h. 25.0 mg sodium borohydride was added. The mass ratio of ZIF-8, H2PtCl6·6H2O and NaBH4 was 8:2:1. After reaction reduction, Pt@ZIF-8 was obtained by centrifugation. Pt@ZIF-8 was a platinum ultrafine nanocluster of 1-3 nm.

[0037] The platinum nanoparticles used in Examples 4-6 of the present invention have a particle size of 2-3 nm and are purchased from Aladdin Reagent Company.

[0038] The common water-based paint components used in the present invention are: emulsion A 85%, deionized water 3.8%, ester alcohol 125.0%, silicon dioxide 0.5%, Twin41000 0.5%, QS-102 1.0%, AF-013A 0.6%, MD-2000 3.0%, DL-2020B 0.6% (emulsion A: butyl acrylate 60 parts, methacrylate 30 parts, methyl methacrylate 10 parts, itaconic acid 5.0 parts, styrene 4.0 parts, diacetone acrylamide 1-3 parts, adipic acid dihydrazide 1-2 parts, sodium lauryl sulfate 1-2 parts, ammonium persulfate 0.1-0.5 parts, water in appropriate amount, other additives in appropriate amount).

[0039] Example 1

[0040] This embodiment provides a method for preparing an environmentally friendly water-based paint that removes formaldehyde.

[0041] 40 parts of acrylic emulsion, 0.4 parts of polyvinyl alcohol dispersant, 0.5 parts of HY-5030 wetting agent, 0.4 parts of AQ-600 thixotropic agent, 0.03 parts of DF-106 antifoaming agent, 0.03 parts of polyethylene glycol defoaming agent and 14 parts of deionized water were mixed and stirred to prepare a mixed solution I;

[0042] Add 2.2 parts of BH-801 polypropylene wax emulsion and 28 parts of Lithopone functional pigment filler into the mixed solution I, and stir and disperse to obtain a slurry;

[0043] Add 0.01 parts of Pt@ZIF-8, 0.07 parts of DF-106 antifoaming agent, and 0.07 parts of polyethylene glycol defoaming agent to the slurry, stir, add 0.07 parts of XL-108 associative polyurethane thickener, stir evenly to obtain an environmentally friendly water-based paint.

[0044] Nano-scale formaldehyde removal functional materials eliminate free formaldehyde in the board and air. Formaldehyde will be decomposed into CO2 and H2O on the surface of platinum nanoclusters. Figure 1 shown.

[0045] Example 2

[0046] This embodiment provides a method for preparing an environmentally friendly water-based paint that removes formaldehyde.

[0047] 42.5 parts of acrylic emulsion, 0.5 parts of polyvinyl alcohol dispersant, 0.6 parts of HY-5030 wetting agent, 0.5 parts of AQ-600 thixotropic agent, 0.125 parts of DF-106 antifoaming agent, 0.125 parts of polyethylene glycol defoaming agent and 17 parts of deionized water were mixed and stirred to prepare a mixed solution I;

[0048] Add 4.1 parts of BH-801 polypropylene wax emulsion and 31.5 parts of mica powder functional pigment filler into the mixed solution I, and stir and disperse to obtain a slurry;

[0049] Add 0.02 parts of Pt@ZIF-8, 0.125 parts of DF-106 antifoaming agent, and 0.125 parts of polyethylene glycol defoaming agent to the slurry, stir, add 0.10 parts of XL-108 associative polyurethane thickener, stir evenly to obtain an environmentally friendly water-based paint.

[0050] Example 3

[0051] This embodiment provides a method for preparing an environmentally friendly water-based paint that removes formaldehyde.

[0052] 45 parts of acrylic emulsion, 0.6 parts of polyvinyl alcohol dispersant, 0.7 parts of HY-5030 wetting agent, 0.6 parts of AQ-600 thixotropic agent, 0.2 parts of DF-106 antifoaming agent, 0.2 parts of polyethylene glycol defoaming agent and 20 parts of deionized water were mixed and stirred to prepare a mixed solution I;

[0053] Add 6 parts of BH-801 polypropylene wax emulsion and 35 parts of mica powder functional pigment filler into the mixed solution I, and stir and disperse to obtain a slurry;

[0054] Add 0.03 parts of Pt@ZIF-8, 0.2 parts of DF-106 antifoaming agent, and 0.2 parts of polyethylene glycol defoaming agent to the slurry, stir, add 0.14 parts of XL-108 associative polyurethane thickener, stir evenly to obtain an environmentally friendly water-based paint.

[0055] Example 4

[0056] This embodiment provides a method for preparing an environmentally friendly water-based paint that removes formaldehyde.

[0057] 40 parts of acrylic emulsion, 0.4 parts of polyvinyl alcohol dispersant, 0.5 parts of HY-5030 wetting agent, 0.4 parts of AO-600 thixotropic agent, 0.03 parts of DF-106 antifoaming agent, 0.03 parts of polyethylene glycol defoaming agent, and 14 parts of deionized water were mixed and stirred to prepare a mixed solution I;

[0058] Add 2.2 parts of BH-801 polypropylene wax emulsion and 28 parts of mica powder functional pigment filler into the mixed solution I, and stir and disperse to obtain a slurry;

[0059] 0.03 parts of platinum nanoparticles, 0.07 parts of DF-600 antifoaming agent, and 0.07 parts of polyethylene glycol defoaming agent were added to the slurry, and stirred. 0.7 parts of XL-108 associative polyurethane thickener were added, and stirred evenly to obtain an environmentally friendly water-based paint.

[0060] Example 5

[0061] This embodiment provides a method for preparing an environmentally friendly water-based paint that removes formaldehyde.

[0062] 42.5 parts of acrylic emulsion, 0.5 parts of polyvinyl alcohol dispersant, 0.6 parts of HY-5030 wetting agent, 0.5 parts of AQ-600 thixotropic agent, 0.125 parts of DF-106 antifoaming agent, 0.125 parts of polyethylene glycol defoaming agent and 17 parts of deionized water were mixed and stirred to prepare a mixed solution I;

[0063] Add 4.1 parts of BH-801 polypropylene wax emulsion and 31.5 parts of mica powder functional pigment filler into the mixed solution I, and stir and disperse to obtain a slurry;

[0064] Add 0.06 parts of platinum nanoparticles, 0.125 parts of DF-600 antifoaming agent, and 0.125 parts of polyethylene glycol defoaming agent to the slurry, stir, add 0.10 parts of XL-108 associative polyurethane thickener, stir evenly to obtain an environmentally friendly water-based paint.

[0065] Example 6

[0066] This embodiment provides a method for preparing an environmentally friendly water-based paint that removes formaldehyde.

[0067] 45 parts of acrylic emulsion, 0.6 parts of polyvinyl alcohol dispersant, 0.7 parts of HY-5030 wetting agent, 0.6 parts of AQ-600 thixotropic agent, 0.2 parts of DF-106 antifoaming agent, 0.2 parts of polyethylene glycol defoaming agent and 20 parts of deionized water were mixed and stirred to prepare a mixed solution I;

[0068] Add 6 parts of BH-801 polypropylene wax emulsion and 35 parts of mica powder functional pigment filler into the mixed solution I, and stir and disperse to obtain a slurry;

[0069] Add 0.09 parts of platinum nanoparticles, 0.2 parts of DF-106 antifoaming agent, and 0.2 parts of polyethylene glycol defoaming agent to the slurry, stir, add 0.14 parts of XL-108 associative polyurethane thickener, stir evenly to obtain an environmentally friendly water-based paint.

[0070] The performance of the environmentally friendly water-based paint in Comparative Examples 1-6.

[0071] 1) Determine the formaldehyde removal rate of the environmentally friendly water-based paint in Examples 1-6 after coating the artificial board.

[0072] Under the conditions of temperature of 20±2℃ and relative humidity of 50±10%, the test is carried out in accordance with the requirements of "Class I" (coating materials with decorative functions) in the standard JC / T 1074-2008 "Purification Performance of Coating Materials with Indoor Air Purification Function", specifically:

[0073] Seven 25 cm x 25 cm artificial boards (7 cm boards) purchased from the market were numbered "1", "2", "3", "4", "5", "6", and "7" respectively, and placed in a 20L glass sealed test chamber for 24 hours. The formaldehyde concentration in each sealed chamber was measured and recorded using an American interscan 4160 formaldehyde detector;

[0074] Take out No. 1-7 artificial boards, No. 1-6 artificial boards are painted with the environmentally friendly water-based paint in Examples 1-6 respectively, and No. 7 artificial board is painted with ordinary water-based paint, and they are painted once every 2 hours, for a total of three times. After being thoroughly dried for 48 hours, they are placed in the test chamber respectively. After being sealed for 24 hours, the formaldehyde concentration in the test chamber is measured and recorded using a 4160 formaldehyde detector.

[0075] The formaldehyde removal rates of the artificial boards coated with different paints after being sealed for 24 hours are shown in Table 1.

[0076] Table 1 Comparison of formaldehyde removal rate after painting of artificial boards

[0077] Test Chamber <![CDATA[Initial formaldehyde concentration mg / m 3 > <![CDATA[Formaldehyde concentration mg / m after 24h 3 > Clearance % 1 2.17 0.40 81.6 2 2.26 0.32 85.8 3 2.20 0.21 90.5 4 2.21 0.49 77.8 5 2.23 0.41 81.6 6 2.21 0.32 85.5 7 2.19 1.80 17.8

[0078] As shown in Table 1, the formaldehyde concentration of the uncoated panels in the test chamber was maintained at 2.20 mg / m 3 Compared with the results of the board without any coating, ordinary water-based paint also has a certain formaldehyde removal effect, which is caused by the sealing effect of water-based paint. The sealing effect is proportional to the thickness of the paint film applied with water-based paint. In this experiment, it was applied three times and the effect reached 17.8%.

[0079] The environmentally friendly water-based paint of Examples 1-6 has a formaldehyde removal rate of 77.8-90.5% after coating the artificial board. When the nano-grade formaldehyde removal functional material is Pt@ZIF-8, the formaldehyde removal effect of the environmentally friendly water-based paint after coating is significantly better than that of the purchased platinum nanoparticles. The effect of the environmentally friendly water-based paint of Examples 1-6 is 4.5-5 times that of ordinary water-based paint, which is much better than that of ordinary water-based paint and reaches a relatively ideal level.

[0080] 2) Determine the formaldehyde removal rate in a confined space by the artificial board coated with the environmentally friendly water-based paint in Examples 1-6.

[0081] At 20±2°C and relative humidity of 50±10%, according to the requirements of "Class I" (coating materials with decorative functions) in the standard JC / T 1074-2008 "Purification Performance of Indoor Air Purification Function Coating Materials", No. 1-6 artificial boards were painted with the environmentally friendly water-based paint in Examples 1-6, and No. 7 artificial board was painted with ordinary water-based paint. 35.0±0.25μL (2.18mg / m 3) Analyze pure formaldehyde. After sealing for 48 hours at room temperature, use a 4160 formaldehyde detector to detect the formaldehyde concentration in the sealed container and record it.

[0082] According to the numerical standard of the 4160 formaldehyde detector: the measured value is the international standard value ppm, while the standard in my country is milligrams per cubic meter (mg / m 3 ), the measured value of the 4160 formaldehyde detector needs to be converted into mg / cubic meter to understand the formaldehyde content in indoor air.

[0083] After formaldehyde was introduced into a confined space for 48 hours, the formaldehyde removal rates of artificial boards painted with different paints are shown in Table 2.

[0084] Table 2 Comparison of formaldehyde removal rates of painted artificial boards in confined spaces

[0085] Test Chamber <![CDATA[Initial formaldehyde concentration mg / m 3 > <![CDATA[Formaldehyde concentration mg / m after 48h 3 > Clearance % 1 2.23 0.45 79.8 2 2.26 0.37 83.6 3 2.18 0.26 88.1 4 2.28 0.54 76.3 5 2.24 0.45 80.0 6 2.25 0.36 84.0 7 2.21 3.75 -69.7

[0086] It can be seen from Table 2 that the ordinary water-based paint applied in the No. 7 experimental chamber can only block the release of a small amount of formaldehyde and cannot remove excess formaldehyde in the environment.

[0087] The environmentally friendly water-based paint of Examples 1-6 has a formaldehyde removal rate of 76.3-88.1% after coating the artificial board.

[0088] The Pt@ZIF-8 or platinum nanoparticles in the plates in the No. 1-6 test chambers not only catalyze and remove the formaldehyde gas in the plates, but also adsorb and remove the formaldehyde gas in the test chambers; the Pt@ZIF-8 or platinum nanoparticles in the plates in the No. 1-6 test chambers not only catalyze and remove the formaldehyde gas in the plates, but also adsorb and remove the formaldehyde gas in the test chambers; therefore, even if there is excess formaldehyde gas in the indoor environment, the surface coating of the environmentally friendly water-based paint of Example 1-6 can effectively adsorb and decompose and remove the excess formaldehyde gas in the environment, ensuring a fresh indoor environment after decoration. This is something that ordinary water-based paint cannot achieve.

[0089] The national maximum limit for indoor formaldehyde concentration is 0.10 mg / m 3 .

[0090] Effect analysis of the environmentally friendly water-based paint in Example 1: If calculated based on a formaldehyde removal rate of 81.6%, after using the environmentally friendly water-based paint in Example 1 of the present invention, the formaldehyde emission of the E1-grade artificial board is less than 0.3 mg / L, which is much lower than the 0.5 mg / L standard of the E0 grade. It can be ensured that the concentration of formaldehyde in the air after using this artificial board is less than 0.1 mg / m 3 safety standards.

[0091] After the environmentally friendly water-based paint in Examples 1-6 of the present invention is applied to the surface of the E1-grade artificial board, the formaldehyde removal rate can reach 75-90%. The formaldehyde emission of the E1-grade artificial board is reduced to 0.3 mg / L, which is lower than the 0.5 mg / L of the E0-grade, and the formaldehyde concentration in the indoor air can be guaranteed to be lower than the safety standard of 0.1 mg / m 3 level to meet the requirements of the indoor environment.

[0092] Comparative Example 1

[0093] The difference between this comparative example and Example 2 is that 0.02 parts of Pt@ZIF-8 are replaced by 0.1 parts of platinum carbon (Pt 10%, size 10-20 nm) to prepare a water-based paint.

[0094] Comparative Example 2

[0095] The difference between this comparative example and Example 2 is that 0.02 parts of Pt@ZIF-8 are replaced by 0.2 parts of platinum carbon (Pt 10%, size 10-20 nm) to prepare a water-based paint.

[0096] Comparative Example 3

[0097] The difference between this comparative example and Example 2 is that 0.02 parts of Pt@ZIF-8 are replaced by 0.1 parts of nano-platinum powder (Pt 99.9%, size 30-50 nm) to prepare a water-based paint.

[0098] Comparative Example 4

[0099] The difference between this comparative example and Example 2 is that 0.02 parts of Pt@ZIF-8 are replaced by 0.2 parts of nano-platinum powder (Pt 99.9%, size 30-50 nm) to prepare water-based paint.

[0100] Comparative Example 5

[0101] The difference between this comparative example and Example 2 is that 0.02 parts of Pt@ZIF-8 are replaced by 0.1 parts of sponge platinum (Pt>99.95%, size 5-10 microns) to prepare a water-based paint.

[0102] Comparative Example 6

[0103] The difference between this comparative example and Example 2 is that 0.02 parts of Pt@ZIF-8 are replaced by 0.2 parts of sponge platinum (Pt>99.95%, size 5-10 microns) to prepare water-based paint.

[0104] The properties of the water-based paints in Comparative Examples 1-6 were determined.

[0105] 1) Determine the formaldehyde removal rate of the water-based paint in Comparative Examples 1-6 after coating the artificial board.

[0106] Under the conditions of temperature of 20±2℃ and relative humidity of 50±10%, the test is carried out in accordance with the requirements of "Class I" (coating materials with decorative functions) in the standard JC / T 1074-2008 "Purification Performance of Coating Materials with Indoor Air Purification Function", specifically:

[0107] Six 25 cm x 25 cm artificial boards (7 cm boards) purchased from the market were numbered "8", "9", "10", "11", "12" and "13" respectively, and placed in a 20L glass sealed test chamber for 24 hours. The formaldehyde concentration in each sealed chamber was measured and recorded using an American interscan 4160 formaldehyde detector;

[0108] Take out No. 8-13 artificial boards, and paint No. 8-13 artificial boards with the water-based paint in Comparative Examples 1-6 respectively, once every 2 hours, for a total of three times. After being thoroughly dried for 48 hours, put them into the test chamber respectively. After being sealed for 24 hours, the formaldehyde concentration in the test chamber is measured and recorded using a 4160 formaldehyde detector.

[0109] The formaldehyde removal rates of the artificial boards coated with different paints after being sealed for 24 hours are shown in Table 3.

[0110] Table 3 Comparison of formaldehyde removal rate after painting of artificial boards

[0111] Test Chamber <![CDATA[Initial formaldehyde concentration mg / m 3 > <![CDATA[Formaldehyde concentration mg / m after 24h 3 > Clearance % 8 2.25 1.30 42.2 9 2.30 1.16 49.6 10 2.19 1.56 28.8 11 2.26 1.42 37.2 12 2.28 1.86 18.4 13 2.25 1.83 18.7

[0112] It can be seen from Table 3 that the formaldehyde removal rate of the water-based paint of Comparative Examples 1-6 after coating the artificial boards is 18.4-49.6%, and the formaldehyde removal effect of the environmentally friendly water-based paint of Example 2 after coating is significantly better than that of Comparative Examples 1-6.

[0113] 2) Determine the formaldehyde removal rate in a confined space by the artificial boards coated with the water-based paint in Comparative Examples 1-6.

[0114] At 20±2℃ and relative humidity 50±10%, according to the requirements of "Class I" (coating materials with decorative functions) in the standard JC / T 1074-2008 "Purification Performance of Indoor Air Purification Function Coating Materials", No. 8-13 artificial boards were painted with the water-based paint in Comparative Examples 1-6, and 35.0±0.25μL (2.18mg / m 3 ) Analyze pure formaldehyde. After sealing for 48 hours at room temperature, use a 4160 formaldehyde detector to detect the formaldehyde concentration in the sealed container and record it.

[0115] According to the numerical standard of the 4160 formaldehyde detector: the measured value is the international standard value ppm, while the standard in my country is milligrams per cubic meter (mg / m 3), the measured value of the 4160 formaldehyde detector needs to be converted into mg / cubic meter to understand the formaldehyde content in indoor air.

[0116] After formaldehyde was introduced into a confined space for 48 hours, the formaldehyde removal rates of the artificial boards painted with different paints are shown in Table 4.

[0117] Table 4 Comparison of formaldehyde removal rates of painted artificial boards in confined spaces

[0118]

[0119]

[0120] As shown in Table 4, the formaldehyde removal rate of the water-based paints of Comparative Examples 1-6 after coating the artificial boards is -63.8 to 18.6%. The formaldehyde removal rate of the environmentally friendly water-based paint of Example 2 is significantly higher than that of Comparative Examples 1-6.

[0121] The national maximum limit for indoor formaldehyde concentration is 0.10 mg / m 3 .

[0122] Analysis of the sealing effect of water-based paint in Comparative Examples 1-6: The formaldehyde emission standard of E1-grade artificial board is 1.5 mg / L. After three coats of water-based paint, the formaldehyde removal rate is calculated based on the highest value of 18.6%. The formaldehyde emission of E1-grade artificial board is reduced to 1.22 mg / L, which does not reach the 0.5 mg / L of E0 grade. Therefore, it cannot be guaranteed that the formaldehyde concentration in the air after use is lower than the safety standard of 0.1 mg / m3.

[0123] Therefore, the size of platinum nanoclusters affects the effect of decomposing formaldehyde. The smaller the size, the stronger the ability to decompose formaldehyde.

[0124] In summary, the present invention adds nano-scale formaldehyde removal functional materials to the water-based paint, and the nano-scale formaldehyde scavenger can decompose the free formaldehyde in the furniture board and the air; the environmentally friendly water-based paint uses pure water as a solvent, and will not produce benzene and TVOC produced by ordinary paints, which can not only eliminate the free formaldehyde in the artificial board, but also avoid the pollution of benzene and TVOC; the environmentally friendly water-based paint has a formaldehyde removal rate of 77.8-90.5% after coating the artificial board; after the formaldehyde is introduced for 48 hours, the formaldehyde removal rate of the environmentally friendly water-based paint after coating the artificial board is 76.3-88.1%, and the environmentally friendly water-based paint can reach the E0 standard after coating the surface of the E1-level artificial board, ensuring that formaldehyde in the indoor air The medium concentration meets the national indoor formaldehyde concentration limit requirements. The environmentally friendly water-based paint of the present invention can effectively absorb and decompose to remove excess formaldehyde gas in the environment, ensuring a fresh indoor environment after decoration; the environmentally friendly water-based paint can remove formaldehyde at room temperature, is non-toxic and harmless, has excellent washability and stain resistance, and is easy to construct. The use of the environmentally friendly water-based paint of the present invention after indoor decoration can reduce harmful gases to a minimum and meet the requirements of the indoor environment. When used, it does not need to be prepared with a diluent, etc. The method of use is simple, and formaldehyde removal and paint application can be completed in one step, eliminating the cumbersome process of first spraying a formaldehyde remover on ordinary oil-based paint and then painting after drying, thereby saving work time and reducing costs.

[0125] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An environmentally friendly water-based paint for removing formaldehyde, characterized in that: The environmentally friendly water-based paint raw materials include: 40-45 parts of polymer emulsion, 28-35 parts of functional pigments and fillers, 0.4-0.6 parts of dispersants, 0.5-0.7 parts of wetting and flattening agents, 0.4-0.6 parts of thixotropic agents, 0.1-0.4 parts of antifoaming agents, 0.1-0.4 parts of defoaming agents, 0.07-0.14 parts of thickeners, 2.2-6 parts of wax emulsions, 0.01-0.09 parts of nano-grade formaldehyde removal functional materials, and 14-20 parts of deionized water; Wherein, the nano-scale formaldehyde removal functional material includes one or both of Pt@ZIF-8 and platinum nanoparticles, and the particle size of the nano-scale formaldehyde removal functional material is 1 to 3 nm.

2. The environmentally friendly water-based paint for removing formaldehyde as claimed in claim 1, characterized in that: The dispersant includes one or more of an organic phosphate dispersant, a polyvinyl alcohol dispersant, and a polycarboxylic acid dispersant.

3. The environmentally friendly water-based paint for removing formaldehyde as claimed in claim 1, characterized in that: The defoaming agent includes one or more of alcohol defoaming agents, ether defoaming agents, phosphate defoaming agents, and silicone defoaming agents, and the antifoaming agent includes one or more of polyether antifoaming agents, silicone antifoaming agents, and high molecular polymer antifoaming agents.

4. The environmentally friendly water-based paint for removing formaldehyde as claimed in claim 1, characterized in that: The wetting and smoothing agent includes one or more of HY-5030 wetting agent, HY-5057 wetting agent, and HY-6086 wetting agent.

5. The environmentally friendly water-based paint for removing formaldehyde as claimed in claim 1, characterized in that: The thixotropic agent includes one or both of Attagel 50 and AQ-600.

6. The environmentally friendly water-based paint for removing formaldehyde as claimed in claim 1, characterized in that: The thickener includes one or more of a cellulose thickener, a polyacrylate thickener, and an associative polyurethane thickener.

7. The environmentally friendly water-based paint for removing formaldehyde as claimed in claim 1, characterized in that: The wax emulsion includes one or both of polyacrylate wax emulsion and polyurethane wax emulsion.

8. The environmentally friendly water-based paint for removing formaldehyde as claimed in claim 1, characterized in that: The functional pigment and filler include one or more of calcium carbonate, titanium dioxide, and lead powder, and the polymer emulsion is one or both of water-based acrylic emulsion and water-based polyurethane emulsion.

9. The method for preparing the environmentally friendly water-based paint for removing formaldehyde as claimed in claim 8, characterized in that: include, The dispersant, part of the antifoaming agent, part of the defoaming agent, the wetting and flattening agent, the thixotropic agent, the wax emulsion and deionized water are mixed and stirred to prepare a mixed solution I; Adding polymer emulsion and functional pigments and fillers into the mixed solution I, stirring and dispersing to obtain a slurry; Nano-scale formaldehyde removal functional material, remaining antifoaming agent and remaining defoaming agent are added to the slurry, stirred, and a thickener is added, stirred evenly to obtain an environmentally friendly water-based paint.

10. The method for preparing the environmentally friendly water-based paint for removing formaldehyde according to claim 9, characterized in that: The amount of the antifoaming agent in the mixed solution I is 1 / 3 to 1 / 2 of the total amount of the antifoaming agent, and the amount of the defoaming agent is 1 / 3 to 1 / 2 of the total amount of the defoaming agent.

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