Odor-free antiviral interior wall water paint

Abstract

The invention belongs to the technical field of functional coatings, and particularly relates to an interior wall latex paint with a certain odor removal effect and a preparation method thereof. A polymer used in the interior wall latex paint contains functional acetic acid methyl ethyl methacrylate and a second functional monomer N-isopropylacrylamide, tests show that the interior wall latex paint has a good removal effect on free formaldehyde, and the interior wall latex paint is a functional paint product. In addition, the process route of the used polymer emulsion has the advantages of cheap and easily available raw materials, simple preparation method, mild reaction conditions and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of functional coatings, and in particular relates to an interior wall latex paint with a certain odor-free effect and a preparation method thereof. Background Art

[0002] Latex paint is a green and environmentally friendly paint containing polymers. Its composition generally includes polymer emulsion, fillers, pigments, additives and water. Due to its many advantages such as low cost, less pollution, convenient construction and beautiful appearance, latex paint has been widely used in architectural coatings. Latex paint is mainly divided into the following two categories: interior wall latex paint and exterior wall latex paint.

[0004] As we all know, formaldehyde has become the main source of indoor air pollution. As an important part of interior decoration materials, the formaldehyde content of interior wall latex paint has become a focus of attention. As people's requirements for the health of the living environment are getting higher and higher, the restrictions on formaldehyde content are becoming more and more stringent. This requires that the formaldehyde content in interior wall latex paint should not only be low, but also effectively absorb free formaldehyde overflowed from other indoor objects, such as various furniture.

[0005] However, how to develop interior wall latex paint with multiple functions is a research difficulty in the polymer field at this stage. Summary of the invention

[0006] The invention provides a polymer emulsion that can be used to prepare a multifunctional interior wall latex paint, and a water-based latex paint prepared from the polymer emulsion. When the obtained latex paint is used for interior decoration, it not only has the performance of ordinary latex paint, but also has a relatively low VOC content because the emulsion is prepared in water. More importantly, it can absorb free formaldehyde and has a certain antiviral effect, and is a multifunctional decorative and finishing material with excellent performance.

[0007] The present invention is implemented according to the following scheme:

[0008] A polymer emulsion comprising: a polymer, an initiator, an emulsifier and water;

[0009] The polymer is polymerized from the following monomers: 1) an acrylate monomer accounting for 93-99% of the total weight of the polymer; 2) a first functional monomer ethyl acetate methyl acrylate accounting for 2-7% of the total weight of the polymer; and, 3) a second functional monomer N-isopropylacrylamide accounting for 0.2-0.7% of the total weight of the polymer;

[0010] The initiator is selected from one or more of ammonium persulfate, potassium persulfate, sodium persulfate, azobisisobutyronitrile, azobisisoheptanenitrile and hydrogen peroxide;

[0011] The emulsifier is selected from one or more of SDS, EH-9 and OP-10.

[0012] In one embodiment of the present invention, the acrylic acid ester monomer is selected from at least one of the following: acrylic acid, methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate, butyl acrylate, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, 2-ethylhexyl acrylate, decyl acrylate, lauryl acrylate, isodecyl methacrylate, lauryl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate. Preferably, the acrylic acid ester monomer is selected from acrylic acid, methacrylic acid, methyl methacrylate and butyl acrylate.

[0013] In one embodiment of the present invention, the polymer emulsion further includes a capping agent polydimethylsiloxane and a cross-linking agent aziridine.

[0014] In one embodiment of the present invention, the content of the initiator is 0.1-1% of the total weight of the polymer emulsion, preferably 0.5-0.8%.

[0015] In one embodiment of the present invention, the content of the emulsifier is 0.5-3% of the total weight of the polymer emulsion, preferably 1-2%.

[0016] In one embodiment of the present invention, the content of the end-capping agent polydimethylsiloxane is 0.01 to 0.5% of the total weight of the polymer emulsion, preferably 0.05 to 0.1%.

[0017] In one embodiment of the present invention, the molecular weight of the hydroxyl-terminated polydimethylsilane is 300 to 100,000 g / mol, preferably 500 to 80,000 g / mol.

[0018] In one embodiment of the present invention, the content of the crosslinking agent aziridine is 0.01 to 0.2% by weight of the total weight of the polymer emulsion, preferably 0.05 to 0.1%.

[0019] In one embodiment of the present invention, the solid content of the polymer emulsion is 20-70%, preferably 30-60%.

[0020] In one embodiment of the present invention, the polymer emulsion contains the following components in weight percentage: 45-65% acrylate monomer, 0.5-1% first functional monomer ethyl acetate methyl acrylate, 0.05-0.1% second functional monomer N-isopropyl acrylamide, 0.5-0.8% initiator, 1-2% emulsifier, 0.05-0.1% polydimethylsiloxane, 0.05-0.1% aziridine, and the balance is water.

[0021] In one embodiment of the present invention, the mass ratio of the first functional monomer ethyl acetate methyl acrylate to the second functional monomer N-isopropyl acrylamide is (5-20):1, preferably (8-15):1, and more preferably 10:1.

[0022] The present invention further provides a method for preparing the polymer emulsion, comprising the following steps: adding acrylate monomers, a first functional monomer ethyl acetate methyl acrylate, a second functional monomer N-isopropyl acrylamide, an initiator and an emulsifier into water for heating reaction.

[0023] In one embodiment of the present invention, the temperature range used for the heating reaction is 60-100°C.

[0024] The invention also provides an interior wall latex paint, which comprises the above polymer emulsion and a pigment for latex paint, an auxiliary agent for latex paint and a filler for latex paint.

[0025] In one embodiment of the present invention, the pigment for latex paint is one or more of the following: carbon black, colored organic pigments, metal oxide pigments such as titanium dioxide, zinc oxide, clay, aluminum silicate, zinc oxide, zinc hydroxide, aluminum silicate, magnesium silicate, calcium silicate, amorphous silicon oxide, fumed silica, colloidal silicon oxide, aluminum oxide, aluminum hydroxide, zirconium oxide, cerium oxide, as well as calcium carbonate, magnesium carbonate, kaolin, clay, talc, calcium sulfate, barium sulfate and zinc carbonate.

[0026] In one embodiment of the present invention, the latex paint additive is selected from one or more of the following: a surfactant, a dispersant, a rheology modifier, a defoamer, a film-forming agent or an opacifying agent.

[0027] In one embodiment of the present invention, the filler for latex paint is one or more of the following: graphene-loaded nanosilver, calcium carbonate (lightweight, heavyweight), kaolin, talcum powder, wollastonite powder, precipitated barium sulfate, ultrafine aluminum silicate and mica powder.

[0028] The technical solution provided by the present invention has the following beneficial effects:

[0029] The polymer used in the interior wall latex paint of the present invention contains functional ethyl acetate methyl acrylate and a second functional monomer N-isopropyl acrylamide. It has been tested that the polymer has a good removal effect on free formaldehyde and is a functional coating product.

[0030] In addition, the process route of the polymer emulsion used in the interior wall latex paint of the present invention has the advantages of cheap and readily available raw materials, simple preparation method, mild reaction conditions, etc. DETAILED DESCRIPTION

[0031] In order to better understand the technical solution of the present invention, the content of the present invention is further described below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0032] Some embodiments of the present invention will now be described in the following examples, in which all parts and percentages are by weight unless otherwise specified.

[0033] Polymer emulsion preparation examples 1-5

[0034] Step 1: Add deionized water (accounting for about 90% of the total mass of water) to the reactor 1, then add the emulsifier in sequence, and stir for 30 minutes with a stirrer at room temperature; then add the acrylic ester monomer, functional monomer, crosslinking agent and end-capping agent in sequence, and stir for 30 minutes after the addition of the raw materials is completed to obtain a pre-emulsion.

[0035] Step 2: Add the remaining deionized water and initiator into the reactor 2, stir evenly, then add 2% (mass fraction) of the above-prepared pre-emulsion, heat to 80° C., stir and react for 45 minutes to obtain a seed emulsion.

[0036] Step 3: After the seed emulsion polymerization reaction is completed, the remaining pre-emulsion in reactor 1 is gradually added dropwise to reactor 2 while maintaining the temperature at 80±2°C and stirring. After the addition is completed, the temperature is kept for 3 hours, then cooled to room temperature, and the pH of the system is adjusted to 7.5-8.5 with ammonia water, and the material is obtained.

[0037] The amounts of raw materials used in each example (parts by weight) are shown in Table 1 below:

[0038] Table 1

[0039]

[0040] Note: "-" in the above table means the dosage of this component is 0.

[0041] The polymer obtained in Example 1 was characterized by infrared spectroscopy. -1 The absorption peaks on the left and right are the stretching vibration peaks of CH, 1850cm -1 The left and right absorption peaks are the stretching vibration peaks of NH, 1700cm -1 The absorption peaks on the left and right are the stretching vibration peaks of C=O. The appearance of these characteristic absorption peaks indicates the formation of polymers.

[0042] Comparative Example 1

[0043] The polymer emulsion was prepared under the same conditions as in Example 2, except that the functional monomer ethyl acetate methyl acrylate was replaced with an equal amount of deionized water.

[0044] Comparative Example 2

[0045] Under the same conditions as in Example 2 above, the only difference is that the functional monomer N-isopropylacrylamide is replaced with an equal amount of deionized water to prepare the polymer emulsion.

[0046] Interior wall latex paint preparation example 6-12

[0047] The polymer emulsions prepared in the above examples 1-5, comparative examples 1 and 2 are respectively used to prepare interior wall latex paints 1-7, wherein the polymer emulsion prepared in example 1 is used to prepare interior wall latex paint 1, the polymer emulsion prepared in example 2 is used to prepare interior wall latex paint 2, the polymer emulsion prepared in comparative example 1 is used to prepare interior wall latex paint 6, and so on. First, 6 parts of titanium dioxide, 0.1 parts of graphene-loaded nanosilver particles, 8 parts of film-forming agent DPM and 8.9 parts of water are uniformly mixed with a dispersing mixer at a low speed, and then 0.5 parts of defoaming agent BYK024 are added. Then, the stirring speed is increased to mix the above ingredients, and 75 parts of polymer emulsions and 1.5 parts of thickener BYK-OptifloH3300 are added, and the mixture is uniformly mixed.

[0048] Test Example 1

[0049] The basic properties of the polymer emulsions prepared in Examples 1-5 were tested, and the results are shown in Table 2 below.

[0050] Table 2

[0051]

[0052] Test Example 2

[0053] The formaldehyde removal effects of the interior wall latex paints 1-7 prepared in Examples 1-5 and Comparative Examples 1 and 2 were tested according to the standard method described in "Building Materials Industry Standard of the People's Republic of China JC / T1074-2008". The test results are shown in Table 3 below.

[0054] Table 3

[0055]

[0056] The data in Table 3 show that the interior wall latex paint prepared by the present invention has a certain formaldehyde removal effect, while the interior wall latex paint prepared by the polymer emulsion without adding functional monomers has a very poor formaldehyde removal effect.

[0057] In addition, since a small amount of graphene-loaded nanosilver particles with antibacterial and antiviral effects are added to the above-mentioned latex paint, it also has certain antibacterial and antiviral effects.

[0058] For the purpose of illustration and description, a description of various forms of the invention has been given above. This description is not intended to be exhaustive or to limit the invention to the precise form disclosed. In light of the above teachings, many modifications or variations are possible. The forms discussed have been selected and described to provide the best illustration of the principles of the invention and its practical application, so that those of ordinary skill in the art can utilize the invention in various forms and various modifications suitable for the specific purpose contemplated. When the appended claims are interpreted according to the scope of their fair, legal, and equitable authorization, all such modifications and variations fall within the scope of the invention as determined by the claims.

Claims

1. A polymer emulsion, characterized in that include: polymer, initiator, emulsifier and water; The polymer is polymerized from the following monomers: 1) an acrylate monomer accounting for 93-99% of the total weight of the polymer; 2) a first functional monomer ethyl acetate methyl acrylate accounting for 2-7% of the total weight of the polymer; and, 3) a second functional monomer N-isopropylacrylamide accounting for 0.2-0.7% of the total weight of the polymer; The initiator is selected from one or more of ammonium persulfate, potassium persulfate, sodium persulfate, azobisisobutyronitrile, azobisisoheptanenitrile and hydrogen peroxide; The emulsifier is selected from one or more of SDS, EH-9 and OP-10.

2. The polymer emulsion according to claim 1, characterized in that The acrylic acid ester monomer is selected from at least one of the following: acrylic acid, methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate, butyl acrylate, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, 2-ethylhexyl acrylate, decyl acrylate, lauryl acrylate, isodecyl methacrylate, lauryl methacrylate, hydroxyethyl methacrylate, and hydroxypropyl methacrylate.

3. The polymer emulsion according to claim 1, characterized in that The polymer emulsion also includes a capping agent, polydimethylsiloxane, and a cross-linking agent, aziridine.

4. The polymer emulsion according to claim 1, characterized in that The content of the initiator accounts for 0.1-1% of the total weight of the polymer emulsion.

5. The polymer emulsion according to claim 1, characterized in that The content of the emulsifier accounts for 0.5-3% of the total weight of the polymer emulsion.

6. The polymer emulsion according to claim 3, characterized in that The content of the end-capping agent polydimethylsiloxane accounts for 0.01-0.5% of the total weight of the polymer emulsion.

7. The polymer emulsion according to claim 3, characterized in that The content of the cross-linking agent aziridine accounts for 0.01-0.2% of the total weight of the polymer emulsion.

8. The polymer emulsion according to any one of claims 1 to 7, characterized in that The polymer emulsion contains the following components in weight percentage: 45-65% of acrylate monomers, 0.5-1% of a first functional monomer ethyl acetate methyl acrylate, 0.05-0.1% of a second functional monomer N-isopropyl acrylamide, 0.5-0.8% of an initiator, 1-2% of an emulsifier, 0.05-0.1% of polydimethylsiloxane, 0.05-0.1% of aziridine, and the balance is water.

9. The method for preparing the polymer emulsion according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: adding acrylic acid ester monomer, a first functional monomer ethyl acetate methyl acrylate, a second functional monomer N-isopropyl acrylamide, an initiator and an emulsifier into water for heating reaction.

10. An interior wall latex paint, characterized in that: The invention comprises the polymer emulsion according to any one of claims 1 to 8, and one or more of a pigment for latex paint, an auxiliary agent for latex paint and a filler for latex paint.

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