CN110903429A - Organic-inorganic composite synthetic resin emulsion for environment-friendly inorganic coating, environment-friendly inorganic coating and preparation method thereof - Google Patents
Organic-inorganic composite synthetic resin emulsion for environment-friendly inorganic coating, environment-friendly inorganic coating and preparation method thereof Download PDFInfo
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention discloses an organic-inorganic composite synthetic resin emulsion for an environment-friendly inorganic coating, the environment-friendly inorganic coating and a preparation method thereof, wherein the organic-inorganic composite synthetic resin emulsion for the environment-friendly inorganic coating is prepared by polymerizing an organic component and an inorganic component at 80-90 ℃ according to the proportion of 0.9-1.1: 1 of solid parts, the organic component is a styrene monomer and an acrylate monomer, and the inorganic component is potassium silicate. The environment-friendly inorganic coating is prepared from water, a defoaming agent, a thickening agent, a dispersing agent, a wetting agent, pigment and filler and organic-inorganic composite synthetic resin emulsion. The invention has the beneficial effects that: under the condition of ensuring that the VOC is not detected, the requirements of washing resistance, fire resistance and stability are met.
Description
Technical Field
The invention relates to the field of decorative materials, in particular to an organic-inorganic composite synthetic resin emulsion for an environment-friendly inorganic coating, an environment-friendly inorganic coating and a preparation method thereof.
Background
As known in the industry, the conventional interior and exterior wall coatings, whether low-grade such as vinyl acetate-acrylic and styrene-acrylic interior wall coatings, styrene-acrylic and pure acrylic exterior wall coatings, or even high-grade silicone-acrylic and fluorocarbon coatings, are widely applied to decorations such as homes, commercial buildings, clubs, entertainment places, office buildings, conference centers, administrative office buildings and the like, and endow buildings with excellent decorative and protective properties.
However, the existing formula also has the following disadvantages:
in order to improve the in-tank corrosion resistance, a preservative is added into the formula, and even a formaldehyde releasing body is contained;
a large amount of antifreeze is added for improving the workability and the low-temperature storage stability; the synthetic resin emulsion … … is added in a larger amount for improving the performance of the coating film; the addition of the raw materials greatly improves the VOC of the product, generates greenhouse effect and is extremely not environment-friendly.
In addition, the addition of a large amount of synthetic resin emulsion greatly reduces the fire resistance of the coating, and the coating cannot be used in occasions with fire-proof requirements, thereby greatly limiting the application field of the coating.
The inorganic coating is prepared from deionized water, cellulose, a dispersing agent, a wetting agent, an antifoaming agent, titanium dioxide, heavy calcium carbonate, talcum powder, emulsion, modified potassium silicate, a stabilizing agent and a hydrophobic agent, wherein the emulsion is styrene-acrylate emulsion, pure acrylic emulsion and silicone acrylic emulsion. The method is characterized in that:
(1) the modified potassium silicate is used as a main binder to replace organic substances with more VOC content in the traditional coating, so that the coating reaches the standard of no VOC detection; the modified potassium silicate enables the coating to be always kept in a higher and stable alkaline range, and the mildew resistance is good;
(2) the modified potassium silicate can react with calcium hydroxide in wall components, water in air, carbon dioxide and the like to generate firmer calcium silicate, calcium carbonate, silicon dioxide and the like, so that the silicate and the wall are integrated and never fall off.
However, the whole formulation design concept continues to use the design method of the conventional emulsion paint, the types of the used raw materials are basically reserved, the emulsion paint is extremely not environment-friendly, and meanwhile, in order to improve the storage stability, although an objective amount of stabilizer is added, the stability is still unsatisfactory.
Disclosure of Invention
For this reason, the applicant has conducted long-term research and repeated experiments, and the technical solutions described below have been generated in this context.
One of the purposes of the invention is to provide an organic-inorganic composite synthetic resin emulsion for an environment-friendly inorganic coating.
The second purpose of the invention is to provide a preparation method of organic-inorganic composite synthetic resin emulsion for environment-friendly inorganic paint.
The invention also aims to provide an environment-friendly inorganic coating which can ensure that the scrubbing resistance, the fire resistance and the stability meet the requirements under the condition of ensuring that VOC is not detected.
The fourth purpose of the invention is to provide the preparation method of the inorganic coating, which can ensure the comprehensive reflection of the technical effect of the environment-friendly inorganic coating through a simple preparation method.
In order to realize one of the purposes of the invention, the adopted technical scheme is as follows:
an organic-inorganic composite synthetic resin emulsion for an environment-friendly inorganic coating is prepared by polymerizing an organic component and an inorganic component at a temperature of 80-90 ℃ according to a mass ratio of 0.9-1.1: 1 of solid parts, wherein the organic component comprises a styrene monomer and an acrylate monomer; the inorganic component is potassium silicate.
In a preferred embodiment of the invention, the organic component and the inorganic component are in a ratio of 1:1 between the parts of solids. The organic and inorganic composite synthetic resin emulsion comprises the following organic components in percentage by weight: 1, the higher the organic component is, the better the storage stability is, the longer the storage period is, but the fire resistance is obviously reduced; the higher the inorganic component is, the better the fire resistance and durability of the coating film is, but the content of the inorganic component is more than 50%, the storage stability of the finished paint is reduced sharply, and the use requirement is difficult to meet.
In a preferred embodiment of the present invention, the solid content of the organic-inorganic composite synthetic resin emulsion is 25 to 35%. The solid content of the organic-inorganic composite synthetic resin emulsion is preferably 30%, which is beneficial to improving the tolerance of formula design; according to the weight percentage, the dosage is about 30 percent of the total weight of the coating, the performance of the coating is influenced too little, the requirements of washing resistance and long-term protection performance of the coating cannot be met, and the requirement of the fire resistance of the coating cannot be met if the dosage is too much, so that the meaning of formula design is lost.
In a preferred embodiment of the present invention, the organic component comprises 2.5 to 6.5 parts of styrene monomer and 3.5 to 14.5 parts of acrylate monomer.
In a preferred embodiment of the present invention, the organic-inorganic composite synthetic resin emulsion for an environmentally friendly inorganic coating material comprises, in parts by weight:
the method for preparing the organic-inorganic composite synthetic resin emulsion for the environment-friendly inorganic coating material as the second aspect of the invention comprises the following steps:
1) preparation of pre-emulsion: uniformly mixing the sodium dodecyl sulfate, the ammonium persulfate and the water, adding a styrene monomer, an acrylate monomer, alkylphenol ethoxylates, vinyl trimethoxy silane and potassium silicate, and uniformly mixing to obtain a pre-emulsion;
2) pre-polymerization: mixing a part of ammonium persulfate and a part of pre-emulsion, and carrying out polymerization reaction to obtain an emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the pre-emulsion into the emulsion prepolymer, and fully reacting to obtain the organic-inorganic composite emulsion.
In a preferred embodiment of the invention, in the step 2), the polymerization reaction is carried out under the condition of stirring at 80-90 ℃ for 30-40 min to obtain the emulsion prepolymer.
In a preferred embodiment of the invention, in the step 3), the sufficient reaction is carried out at 80-90 ℃ for 1.5-2 h with stirring.
The environment-friendly inorganic coating as the third aspect of the invention comprises the following components in parts by weight:
25-35 parts of organic-inorganic composite synthetic resin emulsion.
In a preferred embodiment of the present invention, the organic-inorganic composite synthetic resin emulsion is added in an amount of 30 parts.
In a preferred embodiment of the invention, the dispersant comprises any one or more of the group consisting of NOP KOKAI 5040, 5027, TOO CHEMICAL SUITY, 2500D, Japan.
In a preferred embodiment of the present invention, the defoaming agent comprises any one or more of NXZ of Noppoco, Byk024 of Picker, Germany, and B556 of Edison.
In a preferred embodiment of the invention, the wetting agent comprises any one or more of CF-11, WT, 074, LCN407, of BASF, Germany.
In a preferred embodiment of the invention, the thickener is preferably a cellulosic thickener including any one or more of HBR250 from subluxate usa or HS30000 cellulose from kraelunthracene, germany. Other types of thickeners can affect the storage stability of environmentally friendly inorganic coatings, such as by water separation or gelling.
In a preferred embodiment of the present invention, the pigment and filler includes any one or more of titanium dioxide, ground calcium carbonate and kaolin. Amphoteric pigments and fillers such as alumina, zinc oxide or pigments and fillers containing free calcium, magnesium and the like cannot be used, and the addition of such raw materials can react with inorganic functional groups in the inorganic-organic composite emulsion to cause the product to be gelled.
The preparation method of the environment-friendly inorganic coating as the fourth aspect of the invention comprises the following steps:
the first step is as follows:
firstly, adding water into a dispersion kettle, starting a stirrer, keeping the rotating speed of 500 plus materials at 600rpm/min, adding a defoaming agent with the amount of two thirds of the formula amount, stirring uniformly, slowly adding the thickening agent, increasing the rotating speed to 1200 plus materials at 1300rpm/min, and dispersing at a high speed for 10-15 min until a transparent liquid is clarified;
the second step is that:
reducing the rotation speed to 500-1300 rpm/min, adding the dispersant, wetting agent and pigment filler, increasing the rotation speed to 1200-1300rpm/min, and dispersing at high speed for 40-45 min;
the third step:
reducing the rotating speed to 500-600rpm/min, adding the remaining one third of the defoaming agent for low-speed defoaming, adding the organic-inorganic composite synthetic resin emulsion, and continuing to stir for 10-20min after the material is added until the mixture is uniform, thus obtaining the environment-friendly inorganic coating.
The invention has the beneficial effects that:
the invention changes the defect that the traditional water-based paint needs to be added with various additives in order to facilitate production, storage and use, particularly, organic solvents such as preservatives, film forming additives, antifreeze agents and the like are harmful to human bodies, almost no additive is added, the VOC is close to 0, and the purposes of health, environmental protection and no harm to human bodies are really achieved; meanwhile, the method solves the problems that the inorganic coating prepared by the traditional organic-inorganic binding material mixing method has poor storage stability or needs to add a large amount of stabilizer and other additives, has quite simple and convenient formula and is easy to produce; the storage period is prolonged to more than 1 year from 1-2 months, and the coating film has excellent fire resistance on the basis of keeping the original performance of the coating film, and the fire resistance can reach A level.
Detailed Description
The design principle of the invention is as follows: in the prior art, emulsions and potassium silicate with different proportions are respectively added to serve as binding materials of the coating, and then various pigments, fillers, additives and the like are matched to prepare the inorganic coating, but because the alkalinity of the potassium silicate is too strong, the added emulsions can be gelled and scrapped under the too strong alkalinity condition; the invention adds potassium silicate in the emulsion synthesis process, and the components are subjected to cross-linking reaction in the synthesis process, so that stable organic-inorganic composite synthetic resin emulsion is formed as an inorganic coating binder, the defects of the prior technical scheme are avoided, and the coating film is endowed with better protective decorative performance.
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1:
preparation of an organic-inorganic composite emulsion:
1) preparation of pre-emulsion: adding 1 part by weight of emulsifier sodium dodecyl sulfate and 1.5 parts by weight of ammonium persulfate into 37.45 parts by weight of water, uniformly mixing, adding 3.5 parts by weight of styrene monomer, 12.3 parts by weight of acrylate monomer, 0.5 part by weight of alkylphenol ethoxylate, 2 parts by weight of vinyl trimethoxy silane and 41.75 parts by weight of potassium silicate (40% of solid), and uniformly mixing to obtain a pre-emulsion; (note: adding pre-emulsion with organic-inorganic solid content ratio of 1.1: 120% into water, stirring and reacting at 80 ℃ for 40min to obtain emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the rest pre-emulsion into the emulsion prepolymer, and stirring for reaction for 2 hours at 80 to obtain the organic-inorganic composite emulsion.
Example 2:
preparation of an organic-inorganic composite emulsion:
1) preparation of pre-emulsion: adding 1.5 parts of emulsifier sodium dodecyl sulfate and 1.5 parts by weight of ammonium persulfate into 44.5 parts of water, uniformly mixing, adding 4.0 parts of styrene monomer, 8.2 parts of acrylate monomer, 1.4 parts of alkylphenol ethoxylate, 1.4 parts of vinyl trimethoxy silane and 37.5 parts of potassium silicate (40% of solid), and uniformly mixing to obtain a pre-emulsion; (Note: organic and inorganic solid content ratio 1: 1)
2) Pre-polymerization: adding 40% of ammonium persulfate and 15% of pre-emulsion into water, and stirring and reacting at 90 ℃ for 30min to obtain an emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the rest pre-emulsion into the emulsion prepolymer, and stirring and reacting for 1.5h at 90 ℃ to obtain the organic-inorganic composite emulsion.
Example 3:
preparation of an organic-inorganic composite emulsion:
1) preparation of pre-emulsion: adding 2 parts by weight of emulsifier sodium dodecyl sulfate and 1.0 part by weight of ammonium persulfate into 52.35 parts by weight of water, uniformly mixing, adding 3.4 parts by weight of styrene monomer, 6.5 parts by weight of acrylate monomer, 1.0 part by weight of alkylphenol polyoxyethylene, 1.0 part by weight of vinyl trimethoxy silane and 32.75 parts by weight of potassium silicate (40% of solid), and uniformly mixing to obtain a pre-emulsion; (Note: organic/inorganic solid content ratio 0.91: 1)
2) Pre-polymerization: adding 30% of ammonium persulfate and 18% of pre-emulsion into water, stirring at 85 ℃ and reacting for 40min to obtain emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the rest pre-emulsion into the emulsion prepolymer, and stirring and reacting at 85 ℃ for 1.5h to obtain the organic-inorganic composite emulsion.
Comparative example 1:
preparation of an organic-inorganic composite emulsion:
1)1) preparation of a pre-emulsion: adding 1 part of emulsifier sodium dodecyl sulfate and 2 parts of ammonium persulfate into 57.8 parts of water, uniformly mixing, adding 6.5 parts of styrene monomer, 14.5 parts of acrylate monomer, 1.5 parts of alkylphenol polyoxyethylene, 1.5 parts of vinyl trimethoxy silane and 15.2 parts of potassium silicate (40% of solid), and uniformly mixing to obtain a pre-emulsion;
2) pre-polymerization: adding 40% of ammonium persulfate and 15% of pre-emulsion into water, and stirring and reacting at 90 ℃ for 30min to obtain an emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the rest pre-emulsion into the emulsion prepolymer, and stirring and reacting for 1.5h at 90 ℃ to obtain the organic-inorganic composite emulsion.
Comparative example 2:
preparation of an organic-inorganic composite emulsion:
1) preparation of pre-emulsion: adding 1 part of emulsifier sodium dodecyl sulfate and 0.5 part of ammonium persulfate into 32.5 parts of water, uniformly mixing, adding 1.5 parts of styrene monomer, 3.5 parts of acrylate monomer, 0.5 part of alkylphenol polyoxyethylene, 0.5 part of vinyl trimethoxy silane and 60.0 parts of potassium silicate (40% of solid), and uniformly mixing to obtain a pre-emulsion;
2) pre-polymerization: adding 30% of ammonium persulfate and 18% of pre-emulsion into water, stirring at 85 ℃ and reacting for 40min to obtain emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the rest pre-emulsion into the emulsion prepolymer, and stirring and reacting at 85 ℃ for 1.5h to obtain the organic-inorganic composite emulsion.
Comparative example 3:
preparation of an organic-inorganic composite emulsion:
1) preparation of pre-emulsion: adding 2 parts by weight of emulsifier sodium dodecyl sulfate and 1.5 parts by weight of ammonium persulfate into 28.25 parts by weight of water, uniformly mixing, adding 5.8 parts by weight of styrene monomer, 10.2 parts by weight of acrylate monomer, 1.5 parts by weight of alkylphenol polyoxyethylene, 2.0 parts by weight of vinyl trimethoxy silane and 48.75 parts by weight of potassium silicate (40% of solid), and uniformly mixing to obtain a pre-emulsion;
2) pre-polymerization: adding a part of 20% ammonium persulfate and 20% pre-emulsion into water, stirring at 80 ℃ and reacting for 40min to obtain an emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the rest pre-emulsion into the emulsion prepolymer, and stirring and reacting for 2 hours at 80 ℃ to obtain the organic-inorganic composite emulsion.
Comparative example 4:
preparation of an organic-inorganic composite emulsion:
1) preparation of pre-emulsion: adding 1 part of emulsifier sodium dodecyl sulfate and 1.0 part by weight of ammonium persulfate into 60.25 parts of water, uniformly mixing, adding 2.5 parts of styrene monomer, 7.5 parts of acrylate monomer, 0.5 part of alkylphenol polyoxyethylene, 1.0 part of vinyl trimethoxy silane and 26.25 parts of potassium silicate (40% of solid), and uniformly mixing to obtain a pre-emulsion;
2) pre-polymerization: adding 35% of ammonium persulfate and 18% of pre-emulsion into water, stirring at 85 ℃ and reacting for 35min to obtain emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the rest pre-emulsion into the emulsion prepolymer, and stirring and reacting at 85 ℃ for 1.8h to obtain the organic-inorganic composite emulsion.
Examples 1-3 and comparative examples 1-4 are compared, and some performance indexes are shown in Table 1:
TABLE 1 Key technical index of product
The organic-inorganic composite emulsion obtained by the embodiments 1-3 and the comparative examples 1-4 is applied and tested in performance, except for the comparative examples 1-4, the other performances completely meet the requirements of technical indexes and practical use, and the pure water product is safe and environment-friendly, and is comprehensively analyzed as follows:
the paint has the advantages that the paint has moderate solid content, moderate organic and inorganic matter content, good film forming property, better fire resistance and balanced performance, and the comprehensive performance of the paint is most superior to that of the paint in the embodiment 2; comparative example 1 has too high an organic content, which affects fire resistance, comparative example 2 has too high an inorganic content, the resulting coating is not stable, comparative example 3 has too high a solids content, the resultant emulsion has poor stability, comparative example 4 has too low a solids content, and the resultant emulsion is likewise not stable.
Example 4:
(1) adding 35.3 parts of water into a dispersion kettle, starting a stirrer, keeping the rotating speed at 500rpm/min, adding 0.2 part of B556 defoaming agent, stirring uniformly, slowly adding 0.5 part of thickening agent (cellulose), increasing the rotating speed to 1300rpm/min, and dispersing at a high speed for 10min until a clear transparent liquid is obtained.
(2) Reducing the rotating speed to 500rpm/min, adding 0.6 part of dispersing agent, 0.2 part of wetting agent, 18 parts of titanium dioxide, 15 parts of 800-mesh heavy calcium carbonate and 5 parts of 1250-mesh kaolin, increasing the rotating speed to 1200rpm/min, and dispersing at high speed for 45 min.
(3) Reducing the rotating speed to 600rpm/min, adding 0.2 part of B556 defoaming agent, carrying out low-speed defoaming, adding 25 parts of the organic-inorganic composite synthetic resin emulsion (the solid content is 35%, the organic matter content is 52.3%, and the inorganic matter content is 48.7%) prepared in example 3, and after the addition is finished, continuously stirring for 20min until the mixture is uniform, thereby obtaining the environment-friendly inorganic coating.
Example 5:
(1) adding 33.25 parts of water into a dispersion kettle, starting a stirrer, keeping the rotating speed at 600rpm/min, adding 0.3 part of B556 defoaming agent, stirring uniformly, slowly adding 0.65 part of thickening agent (cellulose), increasing the rotating speed to 1200rpm/min, and dispersing at a high speed for 15min until a clear transparent liquid is obtained.
(2) Reducing the rotating speed to 600rpm/min, adding 0.5 part of dispersing agent, 0.1 part of wetting agent, 18 parts of titanium dioxide, 12 parts of 800-mesh heavy calcium carbonate and 5 parts of 1250-mesh kaolin, increasing the rotating speed to 1300rpm/min, and dispersing at high speed for 40 min.
(3) Reducing the rotating speed to 500rpm/min, adding 0.2 part of B556 defoaming agent, carrying out low-speed defoaming, adding 30 parts of the organic-inorganic composite synthetic resin emulsion (30% of solid content, 50% of organic matter content and 50% of inorganic matter content) prepared in example 2, after the addition is finished, continuously stirring for 20min until the mixture is uniform, and thus obtaining the environment-friendly inorganic coating.
Example 6:
(1) adding 31.55 parts of water into a dispersion kettle, starting a stirrer, keeping the rotation speed at 550rpm/min, adding 0.2 part of B556 defoaming agent, stirring uniformly, slowly adding 0.7 part of thickening agent (cellulose), increasing the rotation speed to 1250rpm/min, and dispersing at a high speed for 12min until a clear transparent liquid is obtained.
(2) Reducing the rotating speed to 500rpm/min, adding 0.4 part of dispersing agent, 0.05 part of wetting agent, 14 parts of titanium dioxide, 13 parts of 800-mesh heavy calcium carbonate and 5 parts of 1250-mesh kaolin, increasing the rotating speed to 1250rpm/min, and dispersing at high speed for 45 min.
(3) Reducing the rotating speed to 600rpm/min, adding 0.1 part of B556 defoaming agent, defoaming at low speed, adding 35 parts of the organic-inorganic composite synthetic resin emulsion (the solid content is 25%, the organic matter content is 47.6%, and the inorganic matter content is 52.4%) prepared in example 1, stirring for 10min after the addition is finished, and obtaining the environment-friendly inorganic coating until the mixture is uniform.
Comparative example 5:
(1) adding 33.25 parts of water into a dispersion kettle, starting a stirrer, keeping the rotating speed at 500rpm/min, adding 0.3 part of B556 defoaming agent, stirring uniformly, slowly adding 0.65 part of thickening agent (cellulose), increasing the rotating speed to 1300rpm/min, and dispersing at a high speed for 10min until a clear transparent liquid is obtained.
(2) Reducing the rotating speed to 500rpm/min, adding 0.5 part of dispersing agent, 0.1 part of wetting agent, 18 parts of titanium dioxide, 12 parts of 800-mesh heavy calcium carbonate and 5 parts of 1250-mesh kaolin, increasing the rotating speed to 1200rpm/min, and dispersing at high speed for 45 min.
(3) Reducing the rotating speed to 600rpm/min, adding 0.2 part of B556 defoaming agent, carrying out low-speed defoaming, adding 30 parts of the organic-inorganic composite synthetic resin emulsion (the solid content is 30%, the organic matter content is 80%, and the inorganic matter content is 20%) prepared in the comparative example 1, and after the addition is finished, continuously stirring for 20min until the mixture is uniform, thus obtaining the environment-friendly inorganic coating.
Comparative example 6:
(1) adding 33.25 parts of water into a dispersion kettle, starting a stirrer, keeping the rotating speed at 600rpm/min, adding 0.3 part of B556 defoaming agent, stirring uniformly, slowly adding 0.65 part of thickening agent (cellulose), increasing the rotating speed to 1200rpm/min, and dispersing at a high speed for 15min until a clear transparent liquid is obtained.
(2) Reducing the rotating speed to 600rpm/min, adding 0.5 part of dispersing agent, 0.1 part of wetting agent, 18 parts of titanium dioxide, 12 parts of 800-mesh heavy calcium carbonate and 5 parts of 1250-mesh kaolin, increasing the rotating speed to 1300rpm/min, and dispersing at high speed for 40 min.
(3) Reducing the rotating speed to 500rpm/min, adding 0.2 part of B556 defoaming agent, defoaming at low speed, adding 30 parts of the organic-inorganic composite synthetic resin emulsion (30 percent of solid content, 20 percent of organic matter content and 80 percent of inorganic matter content) prepared in the comparative example 2, stirring for 20min after the addition is finished, and obtaining the environment-friendly inorganic coating until the mixture is uniform.
Comparative example 7:
(1) adding 33.25 parts of water into a dispersion kettle, starting a stirrer, keeping the rotation speed at 550rpm/min, adding 0.3 part of B556 defoaming agent, stirring uniformly, slowly adding 0.65 part of thickening agent (cellulose), increasing the rotation speed to 1250rpm/min, and dispersing at a high speed for 12min until a clear transparent liquid is obtained.
(2) Reducing the rotating speed to 500rpm/min, adding 0.5 part of dispersing agent, 0.1 part of wetting agent, 18 parts of titanium dioxide, 12 parts of 800-mesh heavy calcium carbonate and 5 parts of 1250-mesh kaolin, increasing the rotating speed to 1250rpm/min, and dispersing at high speed for 45 min.
(3) Reducing the rotating speed to 600rpm/min, adding 0.2 part of B556 defoaming agent, carrying out low-speed defoaming, adding 30 parts of the organic-inorganic composite synthetic resin emulsion (solid content is 39%, organic matter content is 50%, and inorganic matter content is 50%) prepared in comparative example 3, and after the addition is finished, continuously stirring for 10min until the mixture is uniform, thus obtaining the environment-friendly inorganic coating.
Comparative example 8:
(1) adding 33.25 parts of water into a dispersion kettle, starting a stirrer, keeping the rotating speed at 500rpm/min, adding 0.3 part of B556 defoaming agent, stirring uniformly, slowly adding 0.65 part of thickening agent (cellulose), increasing the rotating speed to 1300rpm/min, and dispersing at a high speed for 10min until a clear transparent liquid is obtained.
(2) Reducing the rotating speed to 600rpm/min, adding 0.5 part of dispersing agent, 0.1 part of wetting agent, 18 parts of titanium dioxide, 12 parts of 800-mesh heavy calcium carbonate and 5 parts of 1250-mesh kaolin, increasing the rotating speed to 1250rpm/min, and dispersing at high speed for 45 min.
(3) Reducing the rotating speed to 500rpm/min, adding 0.2 part of B556 defoaming agent, carrying out low-speed defoaming, adding 30 parts of the organic-inorganic composite synthetic resin emulsion (the solid content is 21.0%, the organic matter content is 50% and the inorganic matter content is 50%) prepared in the comparative example 4, continuing stirring for 15min after the addition is finished until the mixture is uniform, and obtaining the environment-friendly inorganic coating.
Comparative example 9:
(1) adding 33.25 parts of water into a dispersion kettle, starting a stirrer, keeping the rotating speed at 580rpm/min, adding 0.3 part of B556 defoaming agent, stirring uniformly, slowly adding 0.65 part of thickening agent (cellulose), increasing the rotating speed to 1300rpm/min, and dispersing at a high speed for 12min until a clear transparent liquid is obtained.
(2) Reducing the rotating speed to 500rpm/min, adding 0.5 part of dispersing agent, 0.1 part of wetting agent, 11.25 parts of potassium silicate, 18 parts of titanium dioxide, 12 parts of 800-mesh heavy calcium carbonate and 5 parts of 1250-mesh kaolin, increasing the rotating speed to 1300rpm/min, and dispersing at high speed for 40 min.
(3) Reducing the rotating speed to 600rpm/min, adding 0.2 part of B556 defoaming agent, defoaming at low speed, adding 9.6 parts of synthetic resin emulsion (the solid content is 47%) (TL-615D of Shanghai Ningshi chemical Co., Ltd.), and continuously stirring for 15min after the addition is finished until the mixture is uniform, thus obtaining the environment-friendly inorganic coating.
The key indexes of the product are detected according to the national standard GB/T9756-2008 synthetic resin emulsion exterior wall coating/GB 8624-2012 building material and product combustion performance grading, and the results are shown in the table 2:
TABLE 2 Key technical index of product
Through application and performance detection, the performance of the environment-friendly inorganic coating obtained by the embodiments 4-6 and the comparative examples 5-9 completely meets the requirements of technical indexes and practical use, the environment-friendly inorganic coating is a pure water product, is safe and environment-friendly, and the performances of other comparative examples are all deficient and are comprehensively analyzed:
the products can be respectively suitable for occasions with different protection requirements, wherein the comprehensive performance of the product is the most excellent in the embodiment 5, and the product is the next in the embodiment 6.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The organic-inorganic composite synthetic resin emulsion for the environment-friendly inorganic coating is characterized by being prepared by polymerizing an organic component and an inorganic component at a temperature of 80-90 ℃ according to a mass ratio of 0.9-1.1: 1 of solid parts, wherein the organic component comprises a styrene monomer, an acrylate monomer and water, and the inorganic component is potassium silicate.
2. The organic-inorganic composite synthetic resin emulsion for an environmentally friendly inorganic coating material as claimed in claim 1, wherein the mass ratio of the organic component to the inorganic component is 1:1 in terms of solid content.
3. The organic-inorganic composite synthetic resin emulsion for an environmentally friendly inorganic coating material as claimed in claim 1, wherein the solid content of the organic-inorganic composite synthetic resin emulsion is 25 to 35%.
4. The organic-inorganic composite synthetic resin emulsion for environment-friendly inorganic paint as claimed in claim 1, wherein the organic component comprises 2.5-6.5 parts of styrene monomer and 3.5-14.5 parts of acrylate monomer.
5. The organic-inorganic composite synthetic resin emulsion for environment-friendly inorganic paint as claimed in claim 1, comprising, in parts by weight:
6. the method for preparing the organic-inorganic composite synthetic resin emulsion for environment-friendly inorganic paint according to claim 5, comprising the steps of:
1) preparation of pre-emulsion: uniformly mixing the sodium dodecyl sulfate, the ammonium persulfate and the water, adding a styrene monomer, an acrylate monomer, alkylphenol ethoxylates, vinyl trimethoxy silane and potassium silicate, and uniformly mixing to obtain a pre-emulsion;
2) pre-polymerization: mixing a part of ammonium persulfate and a part of pre-emulsion, and carrying out polymerization reaction to obtain an emulsion prepolymer;
3) emulsion polymerization: and adding the rest ammonium persulfate and the pre-emulsion into the emulsion prepolymer, and fully reacting to obtain the organic-inorganic composite emulsion.
7. The method for preparing the organic-inorganic composite synthetic resin emulsion for environment-friendly inorganic paint as claimed in claim 6, wherein in the step 2), the polymerization reaction is carried out under the condition of stirring at 80-90 ℃ for 30-40 min to obtain the emulsion prepolymer.
8. The method for preparing the organic-inorganic composite synthetic resin emulsion for environmentally friendly inorganic coating as claimed in claim 6, wherein in the step 3), the sufficient reaction is carried out at 80-90 ℃ for 1.5-2 h under stirring.
9. An environment-friendly inorganic coating is characterized by comprising the following components in parts by weight:
25 to 35 parts of the organic-inorganic composite synthetic resin emulsion according to any one of claims 1 to 5.
10. The method for preparing the environment-friendly inorganic coating material as recited in claim 9, comprising the steps of:
the first step is as follows:
firstly, adding water into a dispersion kettle, starting a stirrer, keeping the rotating speed of 500 plus materials at 600rpm/min, adding a defoaming agent with the amount of two thirds of the formula amount, stirring uniformly, slowly adding the thickening agent, increasing the rotating speed to 1200 plus materials at 1300rpm/min, and dispersing at a high speed for 10-15 min until a transparent liquid is clarified;
the second step is that:
reducing the rotation speed to 500-1300 rpm/min, adding the dispersant, wetting agent and pigment filler, increasing the rotation speed to 1200-1300rpm/min, and dispersing at high speed for 40-45 min;
the third step:
reducing the rotating speed to 500-600rpm/min, adding the remaining one third of the defoaming agent for low-speed defoaming, adding the organic-inorganic composite synthetic resin emulsion, and continuing to stir for 10-20min after the material is added until the mixture is uniform, thus obtaining the environment-friendly inorganic coating.
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