CN111253822A - Rust conversion type environment-friendly coating and preparation method thereof - Google Patents
Rust conversion type environment-friendly coating and preparation method thereof Download PDFInfo
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- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
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Abstract
The invention provides a rust conversion type environment-friendly coating and a preparation method thereof, wherein the rust conversion type environment-friendly coating is prepared from the following raw materials in parts by weight: 70-90 parts of acrylic emulsion, 8-13 parts of polymerization inhibitor, 0.5-2 parts of film-forming assistant, 0.1-1 part of surfactant, 0.1-1 part of defoaming agent, 1-5 parts of cosolvent, 3-6 parts of deionized water and 0.1-0.3 part of thickening agent, wherein the acrylic emulsion is acidic emulsion, and the prepared rust conversion type environment-friendly coating is acidic coating and reacts with the rust of the substrate to ensure that the rust is converted again and is combined with the substrate more tightly, so that the excellent adhesive force is ensured, the APE is not contained, the content of VOC is extremely low, the coating agent is suitable for the national requirements on environment-friendly large environment, and simultaneously, a large amount of manpower and material resources can be saved for coating and maintaining large-scale equipment. The coating prepared by the formula is simple and convenient to use, has good matching performance, and does not influence later-stage coating.
Description
Technical Field
The invention relates to the field of chemical anti-corrosion coatings, in particular to a rust conversion type environment-friendly coating and a preparation method thereof.
Background
The maintenance difficulty and the maintenance cost of large buildings and equipment (steel structures, pipelines, storage tanks and the like) are extremely high, and particularly the polishing treatment of base materials and the rust removal difficulty and the rust removal importance of high-rise and large members reaching a certain service life occupy an extremely important position in the whole maintenance process. In addition, in response to the requirements of national environmental protection situation in recent years, the standards for the VOC content of the coating are stricter and more attention is paid to the health condition of engineering personnel.
Disclosure of Invention
In view of the problems of the prior art, the present invention is directed to a rust conversion type eco-friendly paint and a method for preparing the same,
the object of the invention is achieved in the following way:
the rust conversion type environment-friendly coating is prepared from the following raw materials in parts by weight: 70-90 parts of acrylic emulsion, 8-13 parts of polymerization inhibitor, 0.5-2 parts of film-forming additive, 0.1-1 part of surfactant, 0.1-1 part of defoaming agent, 1-5 parts of cosolvent, 3-6 parts of deionized water and 0.1-0.3 part of thickening agent.
The composition is characterized by comprising the following raw materials in parts by weight: 75-85 parts of acrylic resin, 9-12 parts of polymerization inhibitor, 0.8-1.6 parts of film-forming additive, 0.3-0.8 part of surfactant, 0.2-0.8 part of defoaming agent, 2-4 parts of cosolvent, 4-5 parts of deionized water and 0.2 part of thickening agent.
The polymerization inhibitor is at least one of citric acid, tannic acid and oxalic acid; the film forming agent is at least one of Texanol, DPnP and DPnB; the surfactant is any one of polyether nonionic surfactant and quaternary ammonium salt surfactant;
the defoaming agent is alkynediol; the cosolvent is at least one of ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether and propylene glycol dibutyl ether; the thickener is polyurethane thickener.
The acrylic emulsion is prepared from the following raw materials in parts by weight: 6-8 parts of methyl methacrylate, 15-20 parts of butyl acrylate, 1-1.5 parts of acrylic monomer, 10-15 parts of butyl acetate, 1-1.3 parts of polyvinylidene chloride, 0.1-0.3 part of first nonionic emulsifier, 0.3-0.5 part of second nonionic emulsifier, 0.2-0.8 part of first initiator, 1-3 parts of second initiator and 45-55 parts of deionized water.
The first nonionic emulsifier is one of polyvinyl alcohol and alkylphenol ethoxylates, the second nonionic emulsifier is one of epichlorohydrin and polyoxyethylene octyl phenol ether-10, the first initiator is one of potassium persulfate and potassium permanganate, and the second initiator is one of benzoyl peroxide and terephthaloyl dichloride.
The preparation method of the rust conversion type environment-friendly coating comprises the following steps:
preparation of acrylic emulsion:
(1) taking a reaction container, weighing 40% of the total weight of deionized water according to a formula, adding a first initiator and a first nonionic emulsifier, uniformly stirring at a high speed, slowly adding methyl methacrylate, butyl acrylate and butyl acetate into the container, and stirring at a high speed for 25-35 minutes to obtain a monomer pre-emulsion A;
(2) taking another reaction vessel, adding 60% of deionized water, placing a second nonionic emulsifier and a second initiator into the vessel, adding an acrylic monomer, dispersing, heating to 55-65 ℃ at the speed of a dispersion machine of 500-; obtaining acrylic emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing acrylic emulsion according to the formula ratio;
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding a polymerization inhibitor according to the formula amount, wherein the speed of the dispersion machine is 500-;
(5) mixing the film-forming additive, the surfactant, the defoaming agent and the cosolvent together according to the formula amount, and slowly adding the mixture into the mixed solution in the step (4) at a rate of 2.5-3.5 ml/min;
(6) and (3) mixing deionized water and a thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (5) to obtain the rust conversion type environment-friendly coating.
The high-speed stirring time in the step (1) is 30 minutes, the speed of a dispersing machine in the step (2) is 550 revolutions per minute, and then the temperature is raised to 60 ℃; slowly dripping the pre-emulsion A, completely dripping the pre-emulsion A within 2h, continuously heating to 80 ℃, and preserving the heat for 2 h.
The speed of the disperser in the step (4) is 550 revolutions per minute.
Compared with the prior art, the pure water environment-friendly coating disclosed by the invention is prepared by modifying acrylic emulsion, changing the acrylic emulsion into emulsion with strong acidity through slow dispersion, and reacting the emulsion with the rust of the substrate to ensure that the rust is converted again and is combined with the substrate more tightly, so that the coating not only ensures excellent adhesive force, but also does not contain APE (ammonium paratungstate), has extremely low VOC (volatile organic compound) content, meets the national requirements on environment-friendly large environment, and can save a large amount of manpower and material resources for coating and maintaining large-scale equipment. The coating prepared by the formula is simple and convenient to use, has good matching performance, and does not influence later-stage coating.
Drawings
FIG. 1 shows the effect of the coating of the invention after 1000h of neutral salt spray.
FIG. 2 shows the effect of a commercial paint after 400h of neutral smoke.
FIG. 3 is a graph showing the rust conversion effect of the paint of the present invention.
FIG. 4 is a graph showing the rust conversion effect of a commercially available paint.
Detailed Description
The rust conversion type environment-friendly coating is prepared from the following raw materials in parts by weight: 70-90 parts of acrylic resin, 8-13 parts of polymerization inhibitor, 0.5-2 parts of film-forming additive, 0.1-1 part of surfactant, 0.1-1 part of defoaming agent, 1-5 parts of cosolvent, 3-6 parts of deionized water and 0.1-0.3 part of thickening agent.
Preferably, the rust conversion type environment-friendly coating is prepared from the following raw materials in parts by weight: 75-85 parts of acrylic resin, 9-12 parts of polymerization inhibitor, 0.8-1.6 parts of film-forming additive, 0.3-0.8 part of surfactant, 0.2-0.8 part of defoaming agent, 2-4 parts of cosolvent, 4-5 parts of deionized water and 0.2 part of thickening agent.
Preferably, the polymerization inhibitor is at least one of citric acid, tannic acid and oxalic acid;
the film forming agent is at least one of Texanol, DPnP and DPnB, such as DOWDPNP of Dow and DOWDPNB of Dow;
the surfactant is one of polyether nonionic surfactant and quaternary ammonium salt surfactant, such as fatty alcohol polyoxyethylene ether HIG6400 of new body-linking material, and octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate of Sangda chemical Co., Ltd;
the defoaming agent is acetylenic diol which is 120 produced by Daliangyhe;
the cosolvent is at least one of ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether and propylene glycol dibutyl ether;
the thickener is a polyurethane thickener such as 1152 from BASF.
The acrylic emulsion is prepared from the following raw materials in parts by weight: 6-8 parts of methyl methacrylate, 15-20 parts of butyl acrylate, 1-1.5 parts of acrylic monomer, 10-15 parts of butyl acetate, 1-1.3 parts of polyvinylidene chloride, 0.1-0.3 part of first nonionic emulsifier, 0.3-0.5 part of second nonionic emulsifier, 0.2-0.8 part of first initiator, 1-3 parts of second initiator and 45-55 parts of deionized water.
Preferably, the first nonionic emulsifier is one of polyvinyl alcohol and alkylphenol ethoxylates,
the second nonionic emulsifier is one of epichlorohydrin and polyoxyethylene octyl phenol ether-10,
the first initiator is one of potassium persulfate and potassium permanganate,
the second initiator is one of benzoyl peroxide and terephthaloyl.
The preparation method of the rust conversion type environment-friendly coating comprises the following steps:
preparation of acrylic emulsion:
(1) taking a reaction container, weighing 40% of the total weight of deionized water according to a formula, adding a first initiator and a first nonionic emulsifier, uniformly stirring at a high speed, slowly adding methyl methacrylate, butyl acrylate and butyl acetate into the container, and stirring at a high speed for 25-35 minutes to obtain a monomer pre-emulsion A;
(2) taking another reaction vessel, adding 60% of deionized water, placing a second nonionic emulsifier and a second initiator into the vessel, adding an acrylic monomer, dispersing, heating to 55-65 ℃ at the speed of a dispersion machine of 500-; obtaining acrylic emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing acrylic emulsion according to the formula ratio;
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding a polymerization inhibitor according to the formula amount, wherein the speed of the dispersion machine is 500-;
(5) mixing the film-forming additive, the surfactant, the defoaming agent and the cosolvent together according to the formula amount, and slowly adding the mixture into the mixed solution in the step (4) at a rate of 2.5-3.5 ml/min;
(6) and (3) mixing deionized water and a thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (5) to obtain the rust conversion type environment-friendly coating.
Example 1
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 18 jin of deionized water according to the formula, adding 0.2 jin of first initiator and 0.1 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 6 jin of methyl methacrylate, 15 jin of butyl acrylate, 10 jin of butyl acetate and 1 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 25 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 27 jin of deionized water, adding 0.3 jin of second nonionic emulsifier, 1 jin of second initiator and 1 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 500 r/min, then raising the temperature to 60 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2h, then continuing to raise the temperature to 80 ℃, and then preserving the heat for 2h to obtain the acrylic emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 70 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 8 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 500 r/min;
(5) uniformly mixing 0.5 jin of film-forming additive, 0.1 jin of surfactant, 0.1 jin of defoaming agent and 1 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 2.5 ml/min;
(6) and (3) uniformly mixing 3 jin of deionized water and 0.1 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is polyvinyl alcohol, the second nonionic emulsifier is epichlorohydrin, the first initiator is potassium persulfate, the second initiator is benzoyl peroxide, the polymerization inhibitor is citric acid, the film-forming agent is Texanol, the surfactant is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, the defoaming agent is acetylenic diol, the cosolvent is ethylene glycol butyl ether, and the thickening agent is 1152 produced by BASF.
Example 2
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 22 jin of deionized water according to the formula, adding 0.8 jin of first initiator and 0.3 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 8 jin of methyl methacrylate, 20 jin of butyl acrylate, 15 jin of butyl acetate and 1.3 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 35 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 33 jin of deionized water, adding 0.5 jin of second nonionic emulsifier, 3 jin of second initiator and 1.5 jin of acrylic acid monomer into the vessel, dispersing, wherein the speed of a dispersion machine is 510 r/min, heating to 65 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2.5h, continuously heating to 85 ℃, and then keeping the temperature for 2.5h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 90 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 13 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 500 r/min;
(5) uniformly mixing 2 jin of film-forming additive, 1 jin of surfactant, 1 jin of defoamer and 5 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution in the step (4) at a rate of 3.5 ml/min;
(6) and (4) uniformly mixing 6 jin of deionized water and 0.3 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is polyoxyethylene octylphenol ether-10, the first initiator is potassium permanganate, the second initiator is terephthaloyl, the polymerization inhibitor is tannic acid, the film forming agent is DPnP, the surfactant is fatty alcohol polyoxyethylene ether, the defoaming agent is acetylenic diol, the cosolvent is ethylene glycol butyl ether, and the thickening agent is 1152 produced by BASF.
Example 3
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 20 jin of deionized water according to the formula, adding 0.5 jin of first initiator and 0.2 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, 7 jin of methyl methacrylate, 18 jin of butyl acrylate, 12 jin of butyl acetate and 1.1 jin of polyvinylidene chloride monomer are slowly added into the container in turn, and the mixture is stirred at a high speed for 26 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 30 jin of deionized water, adding 0.4 jin of second nonionic emulsifier, 2 jin of second initiator and 1.2 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 520 rpm, then raising the temperature to 63 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 1.6h, then continuously raising the temperature to 84 ℃, and then preserving the temperature for 1.9h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 75 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 9 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 520 r/min;
(5) uniformly mixing 0.8 jin of film-forming additive, 0.3 jin of surfactant, 0.2 jin of defoaming agent and 2 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 2.6 ml/min;
(6) and (3) uniformly mixing 4 jin of deionized water and 0.2 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is epichlorohydrin, the first initiator is potassium permanganate, the second initiator is benzoyl peroxide, the polymerization inhibitor is tannic acid, the film forming agent is DPnB, the surfactant is fatty alcohol polyoxyethylene ether, the defoaming agent is acetylenic diol, the cosolvent is propylene glycol methyl ether, and the thickening agent is 1152 produced by BASF.
Example 4
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 18 jin of deionized water according to the formula, adding 0.8 jin of first initiator and 0.3 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 6 jin of methyl methacrylate, 15 jin of butyl acrylate, 10 jin of butyl acetate and 1.3 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 28 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 27 jin of deionized water, adding 0.3 jin of second nonionic emulsifier, 1 jin of second initiator and 1.1 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 530 r/min, raising the temperature to 61 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2.4h, continuously raising the temperature to 80 ℃, and then preserving the heat for 2.1h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 85 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 12 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 530 r/min;
(5) uniformly mixing 1.6 jin of film-forming additive, 0.8 jin of surfactant, 0.8 jin of defoaming agent and 4 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 2.8 ml/min;
(6) and (4) uniformly mixing 5 jin of deionized water and 0.2 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is polyvinyl alcohol, the second nonionic emulsifier is epichlorohydrin, the first initiator is potassium permanganate, the second initiator is benzoyl peroxide, the polymerization inhibitor is tannic acid, the film-forming agent is DPnP, the surfactant is fatty alcohol polyoxyethylene ether, the defoaming agent is acetylenic diol, the cosolvent is propylene glycol dibutyl ether, and the thickening agent is 1152 produced by BASF.
Example 5
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 18 jin of deionized water according to the formula, adding 0.6 jin of first initiator and 0.2 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, 7 jin of methyl methacrylate, 16 jin of butyl acrylate, 15 jin of butyl acetate and 1.2 jin of polyvinylidene chloride monomer are slowly added into the container in turn, and stirred at high speed for 30 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 28 jin of deionized water, adding 0.4 jin of second nonionic emulsifier, 2 jin of second initiator and 1.2 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 600 r/min, raising the temperature to 59 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2.3h, continuously raising the temperature to 82 ℃, and then preserving the heat for 2.3h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 72 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 9 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 540 r/min;
(5) uniformly mixing 1 jin of film-forming additive, 0.5 jin of surfactant, 0.5 jin of defoaming agent and 5 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 2.9 ml/min;
(6) and (3) uniformly mixing 3 jin of deionized water and 0.1 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is polyoxyethylene octylphenol ether-10, the first initiator is potassium persulfate, the second initiator is terephthaloyl, the polymerization inhibitor is oxalic acid, the film-forming agent is DPnP, the surfactant is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, the defoaming agent is acetylenic diol, the cosolvent is diethylene glycol butyl ether, and the thickening agent is 1152 produced by BASF; the polymerization inhibitor can also be the mixture of citric acid and oxalic acid, or the mixture of tannic acid and oxalic acid; the film-forming agent can also be a mixture of Texanol and DPnP, or a mixture of DPnP and DPnB; the cosolvent can also be a mixture of diethylene glycol butyl ether and ethylene glycol butyl ether, or a mixture of diethylene glycol butyl ether and propylene glycol methyl ether, or a mixture of diethylene glycol butyl ether, propylene glycol methyl ether and propylene glycol dibutyl ether.
Example 6
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 22 jin of deionized water according to the formula, adding 0.4 jin of first initiator and 0.1 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 8 jin of methyl methacrylate, 20 jin of butyl acrylate, 14 jin of butyl acetate and 1.2 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 32 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 33 jin of deionized water, adding 0.5 jin of second nonionic emulsifier, 3 jin of second initiator and 1.5 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 520 rpm, then raising the temperature to 57 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2 hours, then continuously raising the temperature to 78 ℃, and then preserving the temperature for 2.2 hours to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 74 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 10 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 550 r/min;
(5) uniformly mixing 1.5 jin of film-forming additive, 0.6 jin of surfactant, 0.6 jin of defoaming agent and 4 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 3.5 ml/min;
(6) and (4) uniformly mixing 5 jin of deionized water and 0.3 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is polyvinyl alcohol, the second nonionic emulsifier is epichlorohydrin, the first initiator is potassium persulfate, the second initiator is terephthaloyl, the polymerization inhibitor is citric acid, the film-forming agent is Texanol, the surfactant is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, the defoaming agent is acetylenic diol, the cosolvent is ethylene glycol butyl ether, and the thickening agent is 1152 produced by BASF.
Example 7
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 22 jin of deionized water according to the formula, adding 0.2 jin of first initiator and 0.3 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 6 jin of methyl methacrylate, 19 jin of butyl acrylate, 13 jin of butyl acetate and 1.1 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 34 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 32 jin of deionized water, adding 0.3 jin of second nonionic emulsifier, 1 jin of second initiator and 1.4 jin of acrylic acid monomer into the vessel, dispersing, wherein the speed of a dispersion machine is 540 r/min, heating to 55 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 1.7h, continuously heating to 76 ℃, and then keeping the temperature for 2.4h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 88 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 13 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 560 r/min;
(5) uniformly mixing 0.6 jin of film-forming additive, 0.7 jin of surfactant, 0.7 jin of defoaming agent and 3 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 3.3 ml/min;
(6) and (4) uniformly mixing 6 jin of deionized water and 0.2 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is polyvinyl alcohol, the second nonionic emulsifier is epichlorohydrin, the first initiator is potassium persulfate, the second initiator is terephthaloyl, the polymerization inhibitor is oxalic acid, the film-forming agent is Texanol, the surfactant is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, the defoaming agent is acetylenic diol, the cosolvent is propylene glycol methyl ether, and the thickening agent is 1152 produced by BASF.
Example 8
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 21 jin of deionized water according to the formula, adding 0.8 jin of first initiator and 0.2 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, 7 jin of methyl methacrylate, 18 jin of butyl acrylate, 11 jin of butyl acetate and 1 jin of polyvinylidene chloride monomer are slowly added into the container in turn, and the mixture is stirred at a high speed for 27 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 32 jin of deionized water, adding 0.4 jin of second nonionic emulsifier, 2 jin of second initiator and 1.3 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 560 r/min, raising the temperature to 65 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 1.9h, then continuously raising the temperature to 74 ℃, and then preserving the temperature for 2.5h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 86 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 12 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 570 r/min;
(5) uniformly mixing 0.8 jin of film-forming additive, 0.5 jin of surfactant, 0.8 jin of defoaming agent and 2 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 3.1 ml/min;
(6) and (3) uniformly mixing 4 jin of deionized water and 0.1 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is polyoxyethylene octylphenol ether-10, the first initiator is potassium permanganate, the second initiator is benzoyl peroxide, the polymerization inhibitor is tannic acid, the film forming agent is DPnB, the surfactant is fatty alcohol polyoxyethylene ether, the defoaming agent is acetylenic diol, the cosolvent is propylene glycol dibutyl ether, and the thickening agent is 1152 produced by BASF.
Example 9
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 21 jin of deionized water according to the formula, adding 0.7 jin of first initiator and 0.1 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 8 jin of methyl methacrylate, 17 jin of butyl acrylate, 13 jin of butyl acetate and 1.2 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 29 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 31 jin of deionized water, adding 0.5 jin of second nonionic emulsifier, 3 jin of second initiator and 1.2 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 580 r/min, then raising the temperature to 55 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2.1h, then continuously raising the temperature to 72 ℃, and then preserving the heat for 1.8h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 84 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 11 jin of polymerization inhibitor at 580 r/min;
(5) uniformly mixing 1.2 jin of film-forming additive, 0.2 jin of surfactant, 0.6 jin of defoaming agent and 1 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 2.9 ml/min;
(6) and (3) uniformly mixing 3 jin of deionized water and 0.3 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is polyvinyl alcohol, the second nonionic emulsifier is polyoxyethylene octyl phenol ether-10, the first initiator is potassium permanganate, the second initiator is benzoyl peroxide, the polymerization inhibitor is tannic acid, the film forming agent is DPnP, the surfactant is fatty alcohol polyoxyethylene ether, the defoaming agent is acetylenic diol, the cosolvent is ethylene glycol butyl ether, and the thickening agent is 1152 produced by BASF.
Example 10
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 20 jin of deionized water according to the formula, adding 0.6 jin of first initiator and 0.2 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 6 jin of methyl methacrylate, 15 jin of butyl acrylate, 12 jin of butyl acetate and 1.1 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 31 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 31 jin of deionized water, adding 0.3 jin of second nonionic emulsifier, 1 jin of second initiator and 1 jin of acrylic acid monomer into the vessel, dispersing, raising the temperature to 56 ℃ after the speed of a dispersion machine is 590 rpm, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2.3h, continuously raising the temperature to 75 ℃, and then preserving the temperature for 1.6h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 82 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 10 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 590 r/min;
(5) uniformly mixing 1.4 jin of film-forming additive, 0.4 jin of surfactant, 1 jin of defoaming agent and 5 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 2.7 ml/min;
(6) and (4) uniformly mixing 5 jin of deionized water and 0.2 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is polyvinyl alcohol, the second nonionic emulsifier is polyoxyethylene octyl phenol ether-10, the first initiator is potassium permanganate, the second initiator is benzoyl peroxide, the polymerization inhibitor is tannic acid, the film forming agent is DPnB, the surfactant is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, the defoaming agent is acetylenic diol, the cosolvent is propylene glycol methyl ether, and the thickening agent is 1152 produced by BASF.
Example 11
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 18 jin of deionized water according to the formula, adding 0.5 jin of first initiator and 0.3 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, 7 jin of methyl methacrylate, 20 jin of butyl acrylate, 11 jin of butyl acetate and 1.3 jin of polyvinylidene chloride monomer are slowly added into the container in turn, and stirred at high speed for 33 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 28 jin of deionized water, adding 0.4 jin of second nonionic emulsifier, 2 jin of second initiator and 1.1 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 560 r/min, raising the temperature to 58 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2.2h, then continuously raising the temperature to 77 ℃, and then preserving the heat for 2.4h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 80 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 8 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 600 r/min;
(5) uniformly mixing 1.8 jin of film-forming additive, 0.6 jin of surfactant, 0.9 jin of defoaming agent and 3 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 2.5 ml/min;
(6) and (4) uniformly mixing 6 jin of deionized water and 0.1 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is epichlorohydrin, the first initiator is potassium persulfate, the second initiator is benzoyl peroxide, the polymerization inhibitor is tannic acid, the film-forming agent is DPnB, the surfactant is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, the defoaming agent is acetylenic diol, the cosolvent is propylene glycol methyl ether, and the thickening agent is 1152 produced by BASF.
Example 12
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 19 jin of deionized water according to the formula, adding 0.4 jin of first initiator and 0.1 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 8 jin of methyl methacrylate, 16 jin of butyl acrylate, 10 jin of butyl acetate and 1.2 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 35 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 29 jin of deionized water, adding 0.5 jin of second nonionic emulsifier, 3 jin of second initiator and 1.3 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 520 rpm, then raising the temperature to 60 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2.4h, then continuously raising the temperature to 79 ℃, and then preserving the heat for 1.8h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 78 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 13 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 520 r/min;
(5) uniformly mixing 1.6 jin of film-forming additive, 0.8 jin of surfactant, 0.6 jin of defoaming agent and 1 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 3 ml/min;
(6) and (3) uniformly mixing 4 jin of deionized water and 0.2 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is epichlorohydrin, the first initiator is potassium persulfate, the second initiator is benzoyl peroxide, the polymerization inhibitor is oxalic acid, the film-forming agent is Texanol, the surfactant is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, the defoaming agent is acetylenic diol, the cosolvent is propylene glycol dibutyl ether, and the thickening agent is 1152 produced by BASF.
Example 13
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 19 jin of deionized water according to the formula, adding 0.3 jin of first initiator and 0.2 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 6 jin of methyl methacrylate, 18 jin of butyl acrylate, 14 jin of butyl acetate and 1.1 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 25 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 28 jin of deionized water, adding 0.4 jin of second nonionic emulsifier, 1 jin of second initiator and 1.4 jin of acrylic acid monomer into the vessel, dispersing, wherein the speed of a dispersion machine is 540 r/min, heating to 62 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2.5h, continuously heating to 80 ℃, and then keeping the temperature for 2.5h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 76 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 12 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 540 r/min;
(5) uniformly mixing 1.4 jin of film-forming additive, 0.9 jin of surfactant, 0.4 jin of defoaming agent and 2 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 3.2 ml/min;
(6) and (3) uniformly mixing 3 jin of deionized water and 0.3 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is polyoxyethylene octylphenol ether-10, the first initiator is potassium persulfate, the second initiator is terephthaloyl, the polymerization inhibitor is oxalic acid, the film forming agent is Texanol, the surfactant is octadecyl dimethyl hydroxyethyl quaternary ammonium nitrate, the defoaming agent is acetylenic diol, the cosolvent is propylene glycol dibutyl ether, and the thickening agent is 1152 produced by BASF.
Example 14
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 18 jin of deionized water according to the formula, adding 0.2 jin of first initiator and 0.3 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, slowly adding 7 jin of methyl methacrylate, 19 jin of butyl acrylate, 15 jin of butyl acetate and 1 jin of polyvinylidene chloride monomer into the container in turn, and stirring at high speed for 30 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction vessel, adding 27 jin of deionized water, adding 0.3 jin of second nonionic emulsifier, 2 jin of second initiator and 1.5 jin of acrylic acid monomer into the vessel, dispersing, raising the speed of a dispersion machine to 500 r/min, raising the temperature to 64 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 1.8h, then continuously raising the temperature to 83 ℃, and then preserving the temperature for 1.5h to obtain acrylic acid emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 74 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 10 jin of polymerization inhibitor at the same time, wherein the speed of the dispersion machine is 560 r/min;
(5) uniformly mixing 1.3 jin of film-forming additive, 0.7 jin of surfactant, 0.2 jin of defoaming agent and 4 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) at a rate of 3.4 ml/min;
(6) and (3) uniformly mixing 4 jin of deionized water and 0.1 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is polyoxyethylene octylphenol ether-10, the first initiator is potassium permanganate, the second initiator is benzoyl peroxide, the polymerization inhibitor is citric acid, the film forming agent is Texanol, the surfactant is fatty alcohol polyoxyethylene ether, the defoaming agent is acetylenic diol, the cosolvent is diethylene glycol butyl ether, and the thickening agent is 1152 produced by BASF.
Example 15
Preparation of acrylic emulsion:
(1) taking a reaction container, weighing 20 jin of deionized water according to the formula, adding 0.8 jin of first initiator and 0.3 jin of first nonionic emulsifier, and uniformly stirring at a high speed; then, 7 jin of methyl methacrylate, 18 jin of butyl acrylate, 12 jin of butyl acetate and 1.2 jin of polyvinylidene chloride monomer are slowly added into the container in turn, and stirred at high speed for 30 minutes to obtain monomer pre-emulsion A;
(2) taking another reaction container, adding 30 jin of deionized water, adding 0.3 jin of second nonionic emulsifier, 3 jin of second initiator and 1.5 jin of acrylic acid monomer into the container, dispersing, raising the speed of a dispersion machine to 580 r/min, then raising the temperature to 62 ℃, slowly adding the pre-emulsion A obtained in the step (1), completely dripping the pre-emulsion A within 2h, then continuously raising the temperature to 80 ℃, and then preserving the temperature for 2h to obtain acrylic emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing 90 jin of acrylic emulsion according to the formula amount step (2);
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding 8 jin of polymerization inhibitor at 580 r/min;
(5) uniformly mixing 2 jin of film-forming additive, 0.1 jin of surfactant, 1 jin of defoaming agent and 1 jin of cosolvent according to the formula amount, and adding the mixture into the mixed solution in the step (4) at a rate of 3 ml/min;
(6) and (4) uniformly mixing 6 jin of deionized water and 0.1 jin of thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (4) to obtain the rust conversion type environment-friendly coating.
The first nonionic emulsifier is alkylphenol ethoxylates, the second nonionic emulsifier is polyoxyethylene octylphenol ether-10, the first initiator is potassium permanganate, the second initiator is terephthaloyl, the polymerization inhibitor is tannic acid, the film forming agent is DPnP, the surfactant is fatty alcohol polyoxyethylene ether, the defoaming agent is acetylenic diol, the cosolvent is diethylene glycol butyl ether, and the thickening agent is 1152 produced by BASF.
The acrylic emulsion prepared in the embodiment of the invention is acidic, and different conventional coatings carry out neutralization reaction on the acrylic emulsion, so that anaerobic bacteria are easily bred in an acidic environment, a high-molecular chain segment of the acrylic emulsion is damaged, the acrylic emulsion is corrupted, and the acrylic emulsion is smelly, therefore, polyvinyl alcohol, epoxy chloropropane, polyoxyethylene octyl phenol ether-10 and alkylphenol polyoxyethylene ether compounds are selected as emulsifying agents, the water quality (the electrolytic rate is less than or equal to 2) and the preparation steps are strictly controlled, and a proper dispersion rotating speed (500 plus 600 revolutions per minute) is selected when the acrylic emulsion is dispersed, so that the structure of the acidic acrylic emulsion obtained by copolymerization is tight, and the oxygen damage can be avoided, and the pH value of the prepared rust conversion environment-friendly coating is 2-3.5; too high rotational speed can bring great shearing force production degree of difficulty increase, causes to splash, influences the distribution of getting into emulsion particle size, and too low rotational speed can not form sufficient shearing force, and emulsion particle size is too big or inhomogeneous, influences emulsion effect and storage stability.
The rust is mainly composed of ferric oxide hydrate Fe2O3·nH2O and iron hydroxide (FeO (OH), Fe (OH)3) And (4) forming. Other metals are also oxidized, but are not commonly referred to as "rust". After a sufficient time, the iron will completely oxidize to rust in the presence of sufficient oxygen and water. Rust has no dense texture. Water and oxygen can penetrate the rust and continue to rust the iron inside. In order to prevent rust, a dense surface layer capable of preventing rust is required. After the rust conversion type environment-friendly coating is coated on the rusty substrate surface, rust can react with the acid coating to convert the rust (ferric oxide) into stable salt, and the stable salt is mixed with the substrate into a whole, so that the adhesive force is strong. Compared with the common emulsion, the product has different reasons for forming adhesion and antirust principle, and not only is a layer of coating floating on the surface of a base material, but also becomes a part of the base material after reacting with the base material. After the rust conversion coating is dried, the next coating can be carried out by using the common water-based anticorrosive coating, so that the rust prevention effect of the base material is further improved, and the rust conversion coating can be protected.
The rust conversion coating prepared by the embodiment of the invention has diversified construction processes, and can be sprayed, brushed or dipped; can react with residual rust to ensure that the rust exists stably and is not rusted any more, the rust conversion effect is ensured, the film thickness is not less than 40um, and when the film thickness is 80-100um, the salt spray resistance effect is optimal and can reach 800-1000 h; low-temperature baking, faster drying speed and higher rust conversion efficiency. FIG. 1 is a graph showing the effect of the coating of the present invention after being applied to an iron material and after a neutral salt spray for 1000 hours, compared to FIG. 2, which is a graph showing the effect of a commercially available coating after a neutral salt spray for 400 hours; FIG. 3 shows the rust conversion effect of the coating of the present invention applied to a rusty substrate, and FIG. 4 shows the rust conversion effect of a commercially available material. It can be seen that the neutral smoke resistance time of the present invention is better than that of the common commercially available materials, and the rust conversion effect is good.
Claims (8)
1. A rust conversion type environment-friendly coating is characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 70-90 parts of acrylic emulsion, 8-13 parts of polymerization inhibitor, 0.5-2 parts of film-forming additive, 0.1-1 part of surfactant, 0.1-1 part of defoaming agent, 1-5 parts of cosolvent, 3-6 parts of deionized water and 0.1-0.3 part of thickening agent.
2. The rust conversion-type eco-friendly coating material according to claim 1, characterized in that: the composition is characterized by comprising the following raw materials in parts by weight: 75-85 parts of acrylic resin, 9-12 parts of polymerization inhibitor, 0.8-1.6 parts of film-forming additive, 0.3-0.8 part of surfactant, 0.2-0.8 part of defoaming agent, 2-4 parts of cosolvent, 4-5 parts of deionized water and 0.2 part of thickening agent.
3. The rust conversion-type eco-friendly coating material according to claim 2, characterized in that:
the polymerization inhibitor is at least one of citric acid, tannic acid and oxalic acid;
the film forming agent is at least one of Texanol, DPnP and DPnB;
the surfactant is any one of polyether nonionic surfactant and quaternary ammonium salt surfactant;
the defoaming agent is alkynediol;
the cosolvent is at least one of ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether and propylene glycol dibutyl ether;
the thickener is polyurethane thickener.
4. The rust-converting, environmentally friendly coating according to claim 3, characterized in that: the acrylic emulsion is prepared from the following raw materials in parts by weight: 6-8 parts of methyl methacrylate, 15-20 parts of butyl acrylate, 1-1.5 parts of acrylic monomer, 10-15 parts of butyl acetate, 1-1.3 parts of polyvinylidene chloride, 0.1-0.3 part of first nonionic emulsifier, 0.3-0.5 part of second nonionic emulsifier, 0.2-0.8 part of first initiator, 1-3 parts of second initiator and 45-55 parts of deionized water.
5. The rust-converting, environmentally friendly coating according to claim 4, characterized in that:
the first nonionic emulsifier is one of polyvinyl alcohol and alkylphenol polyoxyethylene,
the second nonionic emulsifier is one of epichlorohydrin and polyoxyethylene octyl phenol ether-10,
the first initiator is one of potassium persulfate and potassium permanganate,
the second initiator is one of benzoyl peroxide and terephthaloyl.
6. The method for preparing a rust conversion type environmental protection paint according to any one of claims 1 to 5, characterized in that:
the steps are as follows:
preparation of acrylic emulsion:
(1) taking a reaction container, weighing 40% of the total weight of deionized water according to a formula, adding a first initiator and a first nonionic emulsifier, uniformly stirring at a high speed, slowly adding methyl methacrylate, butyl acrylate and butyl acetate into the container, and stirring at a high speed for 25-35 minutes to obtain a monomer pre-emulsion A;
(2) taking another reaction vessel, adding 60% of deionized water, placing a second nonionic emulsifier and a second initiator into the vessel, adding an acrylic monomer, dispersing, heating to 55-65 ℃ at the speed of a dispersion machine of 500-; obtaining acrylic emulsion;
the preparation method of the B rust conversion type environment-friendly coating comprises the following steps:
(3) weighing acrylic emulsion according to the formula ratio;
(4) dispersing the acrylic emulsion by a dispersion machine, and slowly adding a polymerization inhibitor according to the formula amount, wherein the speed of the dispersion machine is 500-;
(5) mixing the film-forming additive, the surfactant, the defoaming agent and the cosolvent together according to the formula amount, and slowly adding the mixture into the mixed solution in the step (4) at a rate of 2.5-3.5 ml/min;
(6) and (3) mixing deionized water and a thickening agent according to the formula amount, and adding the mixture into the mixed solution obtained in the step (5) to obtain the rust conversion type environment-friendly coating.
7. The method of preparing a rust conversion coating according to claim 6, characterized in that: the high-speed stirring time in the step (1) is 30 minutes, the speed of a dispersing machine in the step (2) is 550 revolutions per minute, and then the temperature is raised to 60 ℃; slowly dripping the pre-emulsion A, completely dripping the pre-emulsion A within 2h, continuously heating to 80 ℃, and preserving the heat for 2 h.
8. The method of preparing a rust conversion coating according to claim 6, characterized in that: the speed of the disperser in the step (4) is 550 revolutions per minute.
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| CN112175470A (en) * | 2020-10-29 | 2021-01-05 | 中山市中卓科技有限公司 | Benzene-free antistatic coating and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112175470A (en) * | 2020-10-29 | 2021-01-05 | 中山市中卓科技有限公司 | Benzene-free antistatic coating and preparation method thereof |
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