CN1637082A - Nanometer inorganic powder modified water emulsion wall paint and its prepn - Google Patents
Nanometer inorganic powder modified water emulsion wall paint and its prepn Download PDFInfo
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Abstract
The present invention relates to one kind of nanometer inorganic powder modified water emulsion as multifunctional wall paint and its preparation process. The water emulsion as wall paint features containing nanometer inorganic composite powder in 0.5-5 wt%, and the nanometer inorganic composite powder consists of nanometer zinc oxide 1-5 wt%, other nanometer oxide 1-5 wt% and tourmaline powder 90-98 wt% and is produced through surface treatment. The water emulsion as wall paint is prepared through conventional latex preparing process including mixing, high speed dispersing, regulating and other steps. The water emulsion as wall paint has excellent physical performance, can release negative ion to purify air and kill bacteria to provide people with excellent living environment.
Description
Technical Field
The invention relates to a multifunctional aqueous emulsion wall coating modified by nano inorganic composite powder and a preparation method thereof.
Background
The traditional interior wall coating has the functions of enabling the wall surfaces of rooms, corridors and the like to be smooth and attractive, and enabling the spaces of the rooms and the corridors to be bright due to high light reflectivity. With the development of modern technology and the need to meet various applications, the variety and function of interior wall coatings is constantly increasing. However, due to the common use of the interior wall latex paint, adverse reactions such as irritation, hypodynamia, headache, hypomnesis and the like occur in many countries. The detection result shows that the pollution is related to volatile organic compounds in the architectural coating. At present, research and development of low-VOC latex paints are carried out in all countries around the world, but in a latex paint system, various additives are inevitably required to be added, such as coalescing additives, leveling agents, antifreezing agents, anticorrosion and bactericidal agents and the like which contain organic solvents, so that the reduction of the VOC content is an important and difficult problem. The nano inorganic composite powder material is applied to the coating, can release negative ions to purify air and sterilize for a long time, and can endow new functions to the latex paint, thereby preparing the environment-friendly wall coating.
Disclosure of Invention
The invention aims to provide a multifunctional aqueous emulsion wall coating modified by nano inorganic composite powder and a preparation method thereof. The multifunctional aqueous emulsion wall coating has better conventional physical properties, and utilizes the special functions of the nano inorganic composite powder material to release negative ions to purify air and sterilize for a long time, thereby providing a comfortable environment for people's life.
The water emulsion wall paint of the present invention is characterized in that the water emulsion wall paint contains 0.5 to 5 wt% of nanometer inorganic composite powder.
The nano inorganic composite powder used by the aqueous emulsion wall coating is obtained by surface treatment of 1-5 wt% of nano zinc oxide, 1-5 wt% of other nano oxides (such as oxides of Ti, Ce, K, Na, Al, Zr or La and the like) and 90-98 wt% of tourmaline powder; the surface treatment method is 'nano CaCO' according to the patent application No. 02115029.X3Surface organic hybridization treatment method' for nano CaCO3The composite powder is replaced by the composite powder, and other conditions are the same.
The aqueous emulsion wall coating according to the invention as described above generally comprises the following components: 25-40 wt% of polymer emulsion, 0.5-5 wt% of nano inorganic powder, 15-25 wt% of conventional pigment, 8-15 wt% of filler, 1.6-5 wt% of various additives and the balance of water.
The polymer emulsion can be one or two of styrene-acrylic emulsion, pure acrylic emulsion and silicone acrylic emulsion, and the mutual proportion of the two emulsions is 1/4-4/1 wt. The pigment can be rutile titanium dioxide or anatase titanium dioxide. The filler can be heavy calcium carbonate and talcum powder, and the content of the filler is 5-10 wt% and 3-5 wt% of the total weight of the coating respectively. The auxiliaries generally include: dispersant ammonium polyacrylate water solution, the content is 0.3-1.0% wt of the total amount of the coating; the wetting agent is (poly) phosphate wetting agent or foam-inhibiting nonionic surfactant, and the content of the wetting agent is 0.1-0.3 wt% of the total weight of the coating; the thickening agent is cellulose thickening agent, alkali swelling acrylic emulsion thickening agent and nonionic associative polyurethane thickening agent, and the content of the thickening agent is 0.1-0.4 wt%, 0.1-0.5 wt% and 0.1-1.0 wt% of the total amount of the coating respectively; the mildew inhibitor is 2-n-octyl-4-isothiazoline-3-ketoimidazole or isothiazole derivative, and the content of the mildew inhibitor is 0.1-0.2 wt% of the total amount of the coating; the content of the bactericide hydroxymethyl urea 1, 6 dihydroxy-2-5 diazacyclohexane is 0.1-0.2 wt% of the total weight of the coating; the antifreezing agent is ethylene glycol, propylene glycol or glycerol, and the content of the antifreezing agent is 0.1-0.2 wt% of the total amount of the coating; the film-forming assistant is 2, 2, 4-trimethyl-1, 3-pentanediol methyl ethyl butyrate, benzyl alcohol or propylene glycol phenyl ether, and the content of the film-forming assistant is 0.1-0.2 wt% of the total weight of the coating; the pH regulator is sodium carbonate or 2-amino-2-methyl-1-propanol, and the content of the pH regulator is 0.1-0.2 wt% of the total weight of the coating; the defoaming agent is a polyether modified organic silicon emulsion defoaming agent, and the content of the defoaming agent is 0.4-0.8 wt% of the total amount of the coating.
The preparation method of the water emulsion wall coating comprises the following steps:
(1) premixing: sequentially adding water, a dispersing agent, a wetting agent, a pH regulator, a defoaming agent and a cellulose thickening agent into a paint mixing cylinder at a stirring speed of 250-350 revolutions per minute, uniformly stirring, and adding nano inorganic powder, pigment and filler;
(2) high-speed dispersion: stirring at 1300-1600 rpm for 20-30 min to disperse the pigment/filler particles into primary particles under the action of high-speed shear rate and obtain a stable dispersion state under the action of a dispersion system; then adding an alkali swelling acrylic emulsion thickener, and stirring and dispersing at medium speed of 800-1000 rpm for 10-20 minutes to fully disperse the pigment/filler (to the required fineness);
(3) paint mixing: stirring the obtained slurry at a low speed of 300-400 rpm, adding a polymer emulsion, a defoaming agent, a sterilization and mildew prevention agent and a nonionic associative polyurethane thickener, and stirring for 20-30 minutes at a low speed; the desired aqueous emulsion wall coating is obtained.
The water is generally tap water, and the amount of the water is used for complementing the total amount to 100%.
The product performance test results of the aqueous emulsion wall coating are as follows:
item detection value
1. The container has no hard block and is in a uniform state after being stirred
2. Two-layer barrier-free for construction painting
3. Low temperature stability without deterioration
4. Appearance of paint film coating appearance is normal
5. The drying time (hour) is less than or equal to 2
6. Contrast ratio (white and light) is more than 0.95
7. The water resistance (720 hours) is free from abnormal conditions
8. Alkali resistance (168 hours) has no abnormal condition
9. Scrubbing resistance (once) is more than 5000
10. Stain resistance (% 15 in white and light color)%
11. The coating can resist temperature change (10 times of circulation) without abnormal conditions
12. The sterilization rate (%) of Escherichia coli is more than 99.9%
Staphylococcus aureus>99.9%
Staphylococcus aureus about 80% (without nano zinc oxide but with conventional organic bactericide)
13. Mildew resistance 0 grade
14. No skin irritation
15. Concentration of negative ions (per cm)2) 650～750
16. Volatile organic compounds (g/L)<30
The aqueous emulsion wall paint of the invention not only has better conventional physical properties, but also has the following characteristics because the nano inorganic composite powder is added in the components: (1) the multifunctional aqueous emulsion wall coating is produced by applying the conventional emulsion paint preparation process, and the nano inorganic composite powder subjected to surface treatment can be well dispersed and can show a special nano effect. (2) The nano inorganic composite powder is applied to the water emulsion wall coating, and endows the water emulsion wall coating with new special functions, namely, the water emulsion wall coating releases negative ions to purify air and has long-acting sterilization to ensure that a room has good air quality, thereby providing a comfortable environment for life of people.
Zinc oxide is one of traditional inorganic antibacterial materials, zinc ions are slowly released when the zinc oxide is in contact with bacteria, and the zinc ions have oxidation-reduction property and can react with sulfydryl, carboxyl and hydroxyl of cells to destroy the structure of the zinc oxide, and after entering the cells, enzymes of an electron transfer system are destroyed and react with-SH groups, so that the aim of sterilization is fulfilled. After killing the bacteria, zinc ions can be liberated from the cells and the process is repeated.
The nano zinc oxide is an n-type semiconductor compound, has the antibacterial effect of the traditional zinc oxide, and can absorb short-wave light radiation with energy higher than the forbidden bandwidth (hand gap) of the nano zinc oxide due to the fact that the particle size of the nano zinc oxide reaches the nanometer level, so that electron transition and corresponding holes are generated, the energy is transferred to the surrounding medium, photochemical reaction is induced, the nano zinc oxide has photocatalytic capability, and the following reactions occur under the irradiation of light:
in the formula eCB -And hVB +Respectively representing electrons and holes generated on the surface of the zinc oxide by short-wave light with absorption energy higher than the energy of the forbidden band width of the zinc oxide; CB represents a conduction band (conduction band); VB represents a valence band. e.g. of the typeCB -And hVB +The product of the reaction with oxygen and water, respectively, is O2 -And OH:
according to the photocatalysis theory, the nano zinc oxide only plays a photocatalysis role, is not consumed, can be used permanently in theory and has no secondary pollution to the environment. OH&free radical has reaction energy of 402.8kJ/mol, higher than chemical bond energy of various kinds in organic compound. Therefore, the highly active hydroxyl radicals can be used for oxidative decomposition of various organic substances into harmless CO2And H2And O, so that the microorganism can be killed, and organic nutrients can be decomposed, thereby effectively inhibiting mass propagation of microorganisms such as bacteria and the like and achieving the antibacterial and purifying effects.
The nano inorganic composite powder material also has the function of releasing negative ions, which is caused by the following reactions:
negative ion (H)3O2 -And O2 -) Can neutralize and wrap favorable harmful gas particles of formaldehyde, ammonia and benzene with positive charges to form large ion groups and settle down without floatingFloating in the air poses a hazard to human health. The negative ions released by the nano inorganic composite powder material can well remove peculiar smell, because the negative ions can neutralize oxygen free radicals and oxidizing gases (putrefactive smell) in the air, and the formed electric field can decompose the peculiar smell of organic matters, thereby achieving the aim of purifying the air. The nanometer inorganic composite powder material can also sterilize after releasing negative ions, bacteria mostly have positive charges, and are wrapped, neutralized or oxidized and reduced by the negative ions in the air (the negative ions have higher activity), so that the activity of cell membranes or cell protoplasm active enzymes of the bacteria can be damaged, the proliferation and reproduction conditions and the proliferation capacity of the bacteria can be lost, and the aims of resisting and sterilizing (escherichia coli, staphylococcus aureus, mould and the like) are fulfilled.
Drawings
FIG. 1 shows the tan delta temperature curve of the loss tangent of the latex film formed by the aqueous emulsion wall coating of the invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The first embodiment is as follows:
the formula is as follows: 26.2kg of tap water, 40kg of styrene-acrylic emulsion, 0.5kg of sodium polyacrylate dispersant, 0.1kg of wetting agent, 18kg of rutile titanium dioxide, 8kg of heavy calcium carbonate, 3kg of talcum powder, 1.8kg of nano inorganic powder, 0.5kg of polyether modified organosilicon emulsion defoaming agent, 0.3kg of hydroxyethyl cellulose, 0.3kg of alkali swelling thickener, 0.6kg of hydrophobic modified polyurethane thickener, 0.15kg of pH regulator (2-amino-2-methyl-1-propanol), 0.15kg of mildew inhibitor (2-n-octyl-4-isothiazoline-3-ketoimidazole), 0.1kg of bactericide, 0.2kg of antifreeze (propylene glycol) and 0.1kg of film-forming aid (2, 2, 4-trimethyl-1, 3-pentanediol methyl ethyl butyrate);
the preparation process comprises the following steps: (1) firstly, adding tap water into stainless steel dispersion steel, starting a dispersion machine, weighing various materials according to a formula standard, and sequentially adding a cellulose thickening agent, a dispersing agent, a wetting agent, an 1/2 defoaming agent and a pH regulator at a stirring speed of 250-350 rpm; after stirring evenly, adding the nano inorganic composite powder, the pigment and the filler, and then stirring for 5 minutes;
(2) high-speed dispersion: stirring at a high speed of 1300-1600 rpm for 20-30 minutes, checking that the fineness of pigment/filler slurry is less than 35 μm, adding an alkali thickening agent, stirring at a medium speed of 800-1000 rpm, and dispersing for 10 minutes;
(3) paint mixing: and transferring the obtained slurry into a paint mixing cylinder, slowly stirring at 300-400 rpm, adding the polymer emulsion, the residual 1/2 defoamer, the sterilization mildew preventive and the association type thickener, and slowly stirring for 20-30 minutes to obtain the required multifunctional aqueous emulsion wall coating.
The scrubbing resistant times of the coating film are more than 8000; 99.99% of Escherichia coli resistance and 99.98% of Staphylococcus aureus resistance: anion concentration 736 (pieces/cm)2)。
Example two:
the formula is as follows: 28.5kg of tap water, 24kg of acrylic emulsion, 8kg of silicone acrylic emulsion, 0.7kg of sodium polyacrylate dispersant, 0.15kg of wetting agent, 23kg of anatase titanium dioxide, 7kg of ground calcium carbonate, 5kg of talcum powder, 1.2kg of nano inorganic powder, 0.6kg of polyether modified organic silicon emulsion defoaming agent, 0.25kg of hydroxyethyl cellulose, 0.4kg of alkali swelling thickener, 0.5kg of hydrophobic modified polyurethane thickener, 0.2kg of pH regulator (soda ash), 0.1kg of mildew preventive (isothiazole derivative), 0.15kg of bactericide, 0.1kg of antifreeze (ethylene glycol) and 0.15kg of film-forming additive (propylene glycol phenyl ether);
the preparation process comprises the following steps: (1) firstly, adding tap water into stainless steel dispersion steel, starting a dispersion machine, weighing various materials according to a formula standard, and sequentially adding a cellulose thickening agent, a dispersing agent, a wetting agent, an 1/2 defoaming agent and a pH regulator at a stirring speed of 250-350 rpm; after stirringevenly, adding the nano inorganic composite powder, the pigment and the filler, and then stirring for 5 minutes;
(2) high-speed dispersion: stirring at a high speed of 1300-1600 rpm for 20-30 minutes, checking that the fineness of pigment/filler slurry is less than 35 μm, adding an alkali thickening agent, stirring at a medium speed of 800-1000 rpm, and dispersing for 10 minutes;
(3) paint mixing: and transferring the obtained slurry into a paint mixing cylinder, slowly stirring at 300-400 rpm, adding the polymer emulsion, the residual 1/2 defoamer, the sterilization mildew preventive and the association type thickener, and slowly stirring for 20-30 minutes to obtain the required multifunctional aqueous emulsion wall coating.
The scrubbing resistant times of the coating film are more than 6000 through detection; 99.99% of Escherichia coli resistance and 99.98% of Staphylococcus aureus resistance; negative ion concentration 658 (pieces/cm)2)。
Example three:
the formula is as follows: 31.5kg of tap water, 20kg of styrene-acrylic emulsion, 16kg of pure acrylic emulsion, 0.4kg of sodium polyacrylate dispersant, 0.2kg of wetting agent, 14.4kg of rutile titanium dioxide, 10kg of ground calcium carbonate, 4kg of talcum powder, 1.5kg of nano inorganic powder, 0.4kg of polyether modified organic silicon emulsion defoaming agent, 0.15kg of hydroxyethyl cellulose, 0.5kg of alkali swelling thickener, 0.4kg of hydrophobic modified polyurethane thickener, 0.2kg of pH regulator (2-amino-2-methyl-1-propanol), 0.1kg of mildew inhibitor (2-n-octyl-4-isothiazoline-3-ketoimidazole), 0.2kg of bactericide, 0.15kg of antifreeze agent (glycerol) and 0.1kg of film-forming aid (benzyl alcohol).
The preparation process comprises the following steps: (1) firstly, adding tap water into stainless steel dispersion steel, starting a dispersion machine, weighing various materials according to a formula standard, and sequentially adding a cellulose thickening agent, a dispersing agent, a wetting agent, an 1/2 defoaming agent and a pH regulator at a stirring speed of 250-350 rpm; after stirring evenly, adding the nano inorganic composite powder, the pigment and the filler, and then stirring for 5 minutes;
(2) high-speed dispersion: stirring at a high speed of 1300-1600 rpm for 20-30 minutes, checking that the fineness of pigment/filler slurry is less than 35 μm, adding an alkali thickening agent, stirring at a medium speed of 800-1000 rpm, and dispersing for 10 minutes;
(3) paint mixing: and transferring the obtained slurry into a paint mixing cylinder, slowly stirring at 300-400 rpm, adding the polymer emulsion, the residual 1/2 defoamer, the sterilization mildew preventive and the association type thickener, and slowly stirring for 20-30 minutes to obtain the required multifunctional aqueous emulsion wall coating.
The scrubbing resistant times of the coating film are more than 6000 through detection;99.99% of Escherichia coli resistance and 99.98% of Staphylococcus aureus resistance; anion concentration 705 (pieces/cm)2)。
Example four:
(1) firstly, 50g of tap water is added into a stainless steel dispersion cylinder, a dispersion machine is started, various materials are weighed according to the formula standard, and 0.45g of cellulose thickening agent, 0.45g of sodium polyacrylate dispersing agent, 0.2g of wetting agent, 0.25g of polyether modified organic silicon emulsion defoaming agent and 0.18g of pH regulator are sequentially added under the condition of low-speed stirring (250-350 r/m). After stirring evenly, adding inorganic powder or nano inorganic powder 5.0, and stirring for 5 minutes. (2) Stirring at high speed (1500-1600 rpm) in a high speed stirrer for 30 minutes. (3) 60g of styrene-acrylic emulsion is added into a paint mixing cylinder, slowly stirred (300-400 turns), and added with 1/5 of the obtained slurry, 1.0g of film-forming assistant and 0.15g of defoaming agent. Stirring at a low speed for 20-30 minutes. (4) Filtering, pouring into a polytetrafluoroethylene film to obtain a film with the thickness of about 0.5 mm.
The dynamic visco-elastic spectrum of the film was measured on a dynamic mechanical analyzer model DMA/SDTA861 (see FIG. 1).
In fig. 1, A, B and C are respectively added with inorganic powder with regular particle size, nano inorganic composite powder with surface treatment and nano zinc oxide with surface treatment. The inorganic powder and the nano inorganic composite powder do not contribute to energy loss, but the introduction of the inorganic powder and the nano inorganic composite powder causes different changes of the loss tangent value of the styrene-acrylic emulsion film, which shows that the nano inorganic composite powder subjected to surface treatment used in the invention can be well dispersed in the water emulsion wall paint and can show special nano effect.
Claims (8)
1. A water emulsion wall paint is characterized in that the water emulsion wall paint contains 0.5-5 wt% of nano inorganic composite powder.
2. The coating material of claim 1, wherein the nano inorganic composite powder is composed of 1 to 5% by weight of nano inorganic composite powderThe composite powder is prepared by performing surface treatment on composite powder consisting of zinc oxide, 1-5 wt% of other nano oxides and 90-98 wt% of tourmaline powder; the surface treatment method is 'nano CaCO' according to the patent application No. 02115029.X3Surface organic hybridization treatment method' for nano CaCO3Replacing the composite powder.
3. A coating according to claim 1 or 2, characterized in that it consists of: 25-40 wt% of polymer emulsion, 0.5-5 wt% of nano inorganic powder, 15-25 wt% of conventional pigment, 8-15 wt% of filler, 1.6-5 wt% of various additives and the balance of water.
4. The coating according to claim 3, wherein the polymer emulsion is one or two of styrene-acrylic emulsion, pure acrylic emulsion and silicone-acrylic emulsion, and the proportion of the two emulsions is 1/4-4/1 wt.
5. The paint as claimed in claim 3, wherein the pigment is rutile titanium dioxide or anatase titanium dioxide.
6. The coating according to claim 3, wherein the filler is heavy calcium carbonate and talc, and the content of the filler is 5 to 10 wt% and 3 to 5 wt% of the total amount of the coating, respectively.
7. The coating of claim 3 wherein said auxiliary agent comprises: dispersant ammonium polyacrylate water solution, the content is 0.3-1.0% wt of the total amount of the coating; the wetting agent is (poly) phosphate wetting agent or foam-inhibiting nonionic surfactant, and the content of the wetting agent is 0.1-0.3 wt% of the total weight of the coating; the thickening agent is cellulose thickening agent, alkali swelling acrylic emulsion thickening agent and nonionic associative polyurethane thickening agent, and the content of the thickening agent is 0.1-0.4 wt%, 0.1-0.5 wt% and 0.1-1.0 wt% of the total amount of the coating respectively; the mildew inhibitor is 2-n-octyl-4-isothiazoline-3-ketoimidazole or isothiazole derivative, and the content of the mildew inhibitor is 0.1-0.2 wt% of the total amount of the coating; the content of the bactericide hydroxymethyl urea 1, 6 dihydroxy-2-5 diazacyclohexane is 0.1-0.2 wt% of the total weight of the coating; the antifreezing agent is ethylene glycol, propylene glycol or glycerol, and the content of the antifreezing agent is 0.1-0.2 wt% of the total amount of the coating; the film-forming assistant is 2, 2, 4-trimethyl-1, 3-pentanediol methyl ethyl butyrate, benzyl alcohol or propylene glycol phenyl ether, and the content of the film-forming assistant is 0.1-0.2 wt% of the total weight of the coating; the pH regulator is sodium carbonate or 2-amino-2-methyl-1-propanol, and the content of the pH regulator is 0.1-0.2 wt% of the total weight of the coating; the defoaming agent is a polyether modified organic silicon emulsion defoaming agent, and the content of the defoaming agent is 0.4-0.8 wt% of the total amount of the coating.
8. A process for the preparation of a coating as claimed in any one of claims 1 to 7, which comprises the steps of:
(1) premixing: sequentially adding water, a dispersing agent, a wetting agent, a pH regulator, a defoaming agent and a cellulose thickening agent into a paint mixing cylinder at a stirring speed of 250-350 revolutions per minute, uniformly stirring, and adding nano inorganic powder, pigment and filler;
(2) dispersing at high speed; stirring at a high speed of 1300-1600 rpm for 20-30 minutes, adding an alkali swelling acrylic emulsion thickener, and stirring and dispersing at a medium speed of 800-1000 rpm for 10-20 minutes;
(3) paint mixing: stirring the obtained slurry at a low speed of 300-400 rpm, adding a polymer emulsion, a defoaming agent, a sterilization and mildew prevention agent and a nonionic associative polyurethane thickener, and stirring for 20-30 minutes at a low speed; the desired aqueous emulsion wall coating is obtained.
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| CN103409007B (en) * | 2013-07-03 | 2016-04-06 | 安徽真信涂料有限公司 | A kind of ageing-resistant interior wall coating and preparation method thereof |
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