Background
The building exterior wall tile can play a certain role in beautifying cities, and at the end of the last century, the building exterior wall tile is popular, but after decades of wind blowing and sun drying and acid rain erosion, the brick surface has the problems of dirt, cracking, falling off and the like, so that the attractiveness of the building exterior wall surface is influenced, and the problem of water leakage of buildings comes along with the problem, so that the renovation of the exterior wall tile is particularly important.
At present, there are two ways to renovate exterior wall tiles: 1. removing the ceramic tile and rolling and coating finish paint; 2. directly coating putty on the surface of the ceramic tile and rolling and coating finish paint. Obviously, the first mode is time-consuming and labor-consuming and has high construction strength. Therefore, in recent years, efforts have been made to develop a paint for renovating tiles, which can be directly applied to the surface of old tiles. However, the coating has certain problems, such as low adhesion, easy coating falling off, low surface gloss, insufficient waterproof performance and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the waterproof coating with high adhesive force and high surface gloss, which can be applied to coating and renovating the surface of the exterior wall tile.
In order to achieve the purpose, the invention provides the following technical scheme:
the waterproof coating for the outer wall comprises the following components in parts by weight:
further, the polymer emulsion is prepared by emulsion polymerization of two or more of methyl methacrylate, butyl acrylate, methyl acrylate, hydroxypropyl methacrylate and glycidyl methacrylate and one or more of trifluoroethyl acrylate, hexafluoroisopropyl methacrylate, hexafluorobutyl methacrylate and perfluoroalkyl ethyl acrylate.
Further, the bactericidal preservative is isothiazolinone.
Further, the surfactant is sodium carboxymethyl cellulose.
Further, the filler is formed by compounding micron-sized titanium dioxide, calcium carbonate, mica powder and kaolin according to the mass ratio of 6:2:1: 1.
Further, the antifreeze is one of propylene glycol, ethylene glycol or polyethylene glycol.
Further, the film forming auxiliary agent is one or more of ethylene glycol butyl ether, dodecyl alcohol ester, propylene glycol phenyl ether, dipropylene glycol butyl ether and dibutyl phthalate.
Further, the defoaming agent is a polysiloxane-based defoaming agent.
A method for preparing the exterior wall waterproof coating material, which comprises the following steps:
1) weighing the components according to the proportion;
2) adding a pH regulator into a part of water, regulating the pH value to 8-9, then adding a polymer emulsion, a surfactant and a sterilizing preservative, and stirring and dispersing for 30min at the rotating speed of 1000 r/m;
3) then adding ethylene oxide-propylene oxide block copolymer, filler and another half water, and stirring at a high speed of 1500r/m for 15 min;
4) and finally, reducing the speed to 200r/m, adding the antifreeze agent, the film forming additive and the defoamer while stirring, and uniformly mixing to obtain the waterproof coating.
Compared with the prior art, the invention has the beneficial effects that: the waterproof coating prepared by copolymerizing the acrylate monomer and the acrylate fluorine-containing monomer to prepare the emulsion and compounding the emulsion with the filler and various functional additives has excellent adhesive force on the surface of the ceramic tile, improves the self-cleaning and stain-resistant properties, has obvious glossiness when coated on the surface of the ceramic tile, and plays a certain role in urban beautification; the invention has the advantages of easily obtained raw materials, low cost, simple process, economy and environmental protection.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example (b): a process for preparing the waterproof coating for the outer wall comprises the following steps:
1) adding 0.5-1 part of pH regulator into 10-20 parts of water, regulating the pH value to 8-9, then adding 30-40 parts of polymer emulsion, 0.5-1 part of surfactant and 0.1-0.3 part of bactericidal preservative, and stirring and dispersing for 30min at the rotating speed of 1000 r/m;
2) then adding 4-8 parts of ethylene oxide-propylene oxide segmented copolymer, 28-42 parts of filler and 10-20 parts of water, and stirring at a high speed of 1500r/m for 15 min;
3) and finally, reducing the speed to 200r/m, adding 1.5-2 parts of an antifreeze agent, 3.5-4 parts of a film forming additive and 2.5-3.5 parts of a defoaming agent while stirring, and uniformly mixing to obtain the waterproof coating.
The polymer emulsion is prepared by emulsion polymerization of an acrylate monomer and an acrylate fluorine-containing monomer, wherein the acrylate monomer is preferably two or more of methyl methacrylate, butyl acrylate, methyl acrylate, hydroxypropyl methacrylate and glycidyl methacrylate; the acrylate fluorine-containing monomer is preferably one or more of trifluoroethyl acrylate, hexafluoroisopropyl methacrylate, hexafluorobutyl methacrylate and perfluoroalkyl ethyl acrylate.
The emulsion polymerization may be carried out by the following steps: adding 0.5-1 part of initiator, 2-3 parts of emulsifier and 0.1-0.3 part of sodium bicarbonate into a reaction bottle to prepare an aqueous solution, and heating to 70-80 ℃; weighing 10-20 parts of acrylate monomer and 5-15 parts of acrylate fluorine-containing monomer in a glass bottle, uniformly mixing, slowly dropwise adding the mild monomer into the aqueous solution, and stirring for reacting for 1-1.5 h.
Wherein the emulsifier is one of nonylphenol polyoxyethylene ether NP series, octylphenol polyoxyethylene ether OP series and alkylbenzene sulfonate; the initiator is ammonium persulfate or sodium persulfate.
Further, the bactericidal preservative is isothiazolinone.
Furthermore, the surfactant is sodium carboxymethylcellulose which is easily dispersed in water to form a transparent colloidal solution, helps the polymer emulsion and the filler to be dispersed in water, and can be used as a thickening agent, an emulsifying agent and a binder, so that the functions are strong and the dosage is small.
Further, the filler is formed by compounding micron-sized titanium dioxide, calcium carbonate, mica powder and kaolin according to the mass ratio of 6:2:1: 1.
Further, the antifreeze is one of propylene glycol, ethylene glycol or polyethylene glycol.
Further, the film forming auxiliary agent is one or more of ethylene glycol butyl ether, dodecyl alcohol ester, propylene glycol phenyl ether, dipropylene glycol butyl ether and dibutyl phthalate.
Further, the defoaming agent is a polysiloxane-based defoaming agent.
Example 1:
1) adding 0.5 part of pH regulator into 10 parts of water, regulating the pH value to 8-9, then adding 30 parts of polymer emulsion, 0.5 part of sodium carboxymethylcellulose and 0.1 part of bactericidal preservative, and stirring and dispersing for 30min at the rotating speed of 1000 r/m;
2) then adding 5 parts of ethylene oxide-propylene oxide segmented copolymer, 28 parts of filler and 10 parts of water, and stirring at a high speed of 1500r/m for 15 min;
3) and finally, reducing the speed to 200r/m, adding 1.5 parts of antifreeze agent, 3.5 parts of film-forming additive and 2.5 parts of defoaming agent while stirring, and uniformly mixing to obtain the waterproof coating.
Wherein the polymer emulsion: adding 0.5 part of ammonium persulfate, 2 parts of nonylphenol polyoxyethylene ether NP-10 and 0.1 part of sodium bicarbonate into a reaction bottle to prepare an aqueous solution, and heating to 70 ℃; weighing 8 parts of methyl methacrylate, 4 parts of butyl acrylate and 10 parts of trifluoroethyl acrylate in a glass bottle, uniformly mixing, slowly dropwise adding the mild monomer into the aqueous solution, and stirring for reacting for 1 hour.
Example 2:
1) adding 0.6 part of pH regulator into 12 parts of water, regulating the pH value to 8-9, then adding 35 parts of polymer emulsion, 0.6 part of sodium carboxymethylcellulose and 0.1 part of bactericidal preservative, and stirring and dispersing for 30min at the rotating speed of 1000 r/m;
2) then adding 5 parts of ethylene oxide-propylene oxide segmented copolymer, 33 parts of filler and 15 parts of water, and stirring at a high speed of 1500r/m for 15 min;
3) and finally, reducing the speed to 200r/m, adding 1.7 parts of antifreeze agent, 3.8 parts of film-forming additive and 2.7 parts of defoaming agent while stirring, and uniformly mixing to obtain the waterproof coating.
Wherein the polymer emulsion: adding 0.6 part of ammonium persulfate, 2 parts of nonylphenol polyoxyethylene ether OP-10 and 0.1 part of sodium bicarbonate into a reaction bottle to prepare an aqueous solution, and heating to 70 ℃; weighing 7 parts of methyl methacrylate, 5 parts of butyl acrylate and 12 parts of trifluoroethyl acrylate in a glass bottle, uniformly mixing, slowly dropwise adding the mild monomer into the aqueous solution, and stirring for reacting for 1 hour.
Example 3:
1) adding 0.7 part of pH regulator into 16 parts of water, regulating the pH value to 8-9, then adding 38 parts of polymer emulsion, 0.5 part of sodium carboxymethylcellulose and 0.1 part of bactericidal preservative, and stirring and dispersing for 30min at the rotating speed of 1000 r/m;
2) then 6 parts of ethylene oxide-propylene oxide segmented copolymer, 38 parts of filler and 20 parts of water are added and stirred at a high speed of 1500r/m for 15 min;
3) and finally, reducing the speed to 200r/m, adding 2.0 parts of antifreeze agent, 4.0 parts of film forming additive and 3.2 parts of defoaming agent while stirring, and uniformly mixing to obtain the waterproof coating.
Wherein the polymer emulsion: adding 0.8 part of ammonium persulfate, 3 parts of nonylphenol polyoxyethylene ether OP-10 and 0.1 part of sodium bicarbonate into a reaction bottle to prepare an aqueous solution, and heating to 80 ℃; in a glass bottle, 8 parts of methyl methacrylate, 5 parts of methyl acrylate, 2 parts of hydroxypropyl methacrylate and 15 parts of hexafluoroisopropyl methacrylate were weighed and mixed uniformly, the moderating monomer was slowly dropped into the above aqueous solution, and the reaction was stirred for 1 hour.
The primers prepared in examples 1-3 were subjected to performance tests with reference to JG/T210-2018 film-forming exterior wall primer type I standard, and the results are recorded in Table 1.
TABLE 1
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Example 1
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Example 2
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Example 3
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Water resistance
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No abnormal condition for 96h
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No abnormal condition for 96h
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No abnormal condition for 96h
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Alkali resistance
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No abnormal condition for 48 hours
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No abnormal condition for 48 hours
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No abnormal condition for 48 hours
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Water permeability/mL
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0.21
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0.20
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0.15 |
The exterior wall waterproof coating prepared by the invention has excellent water resistance, alkali resistance and waterproof performance. Meanwhile, the coating has good glossiness, and does not bubble, peel or crack after being coated for six days.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.