阅读说明：本技术 一种超快干铸管防腐漆制备方法 (Preparation method of anticorrosive paint for ultrafast dry cast pipe ) 是由 王鸿忠 于 2021-06-30 设计创作，主要内容包括：本发明公开了一种超快干铸管防腐漆制备方法。本发明先用八甲基环四硅氧烷和三氟氯乙烯混合后制得硅氧烷乙烯混合物,将硅氧烷乙烯混合物、硫酸钡和轻体碳酸钙一起在高压聚合反应釜中混合反应后,对叔碳酸乙烯进行改性,再用改性后的叔碳酸乙烯酯对醋酸乙烯和BF-9011丙烯酸分散体的混合物再次进行改性,通过加入水性膨润土、消泡剂等助剂,搅拌均匀后,研磨、调节pH值后,检验性能合格,过滤,包装,制得基体为改性醋酸乙烯和丙烯酸分散体混合物的超快干铸管防腐漆。本发明制备的超快干铸管防腐漆具有超快干、耐腐蚀和强拉伸的效果。(The invention discloses a preparation method of an ultrafast dry cast pipe anticorrosive paint. The invention firstly mixes octamethylcyclotetrasiloxane and chlorotrifluoroethylene to prepare siloxane ethylene mixture, mixes the siloxane ethylene mixture, barium sulfate and light calcium carbonate together in a high-pressure polymerization reaction kettle for reaction, modifies ethylene versatate, modifies the mixture of vinyl acetate and BF-9011 acrylic acid dispersoid again by the modified ethylene versatate, adds auxiliary agents such as water-based bentonite and defoaming agent, uniformly stirs, grinds, adjusts the pH value, tests the performance to be qualified, filters and packages to prepare the ultrafast dry cast pipe anticorrosive paint with the matrix of the mixture of modified vinyl acetate and acrylic acid dispersoid. The ultra-fast dry cast pipe anticorrosive paint prepared by the invention has the effects of ultra-fast drying, corrosion resistance and strong stretching.)

1. The preparation method of the anticorrosive paint for the ultrafast dry cast pipe is characterized by mainly comprising the following preparation steps of:

(1) preparing modified vinyl versatate: mixing a mixed aqueous solution of sodium carbonate, ammonium perfluorooctanoate and ammonium persulfate with chlorotrifluoroethylene in a high-pressure reaction kettle for reaction, adding octamethylcyclotetrasiloxane and an aqueous solution of sodium bisulfite for reaction to obtain a siloxane ethylene mixture, continuing mixing and reacting the siloxane ethylene mixture, vinyl versatate and deionized water in a high-pressure polymerization reaction kettle, adding barium sulfate and light calcium carbonate for mixing to obtain modified vinyl versatate;

(2) preparation of vinyl acetate-acrylic copolymer: mixing vinyl acetate and BF-9011 acrylic acid dispersoid, uniformly stirring to obtain mixed emulsion, adding distilled water and polyvinyl alcohol, mixing, adding sodium dodecyl sulfate and light calcium carbonate after reaction, stirring, heating and reacting to obtain a vinyl acetate-acrylic copolymer;

(3) preparing the anticorrosive paint for the ultrafast dry cast pipe: mixing deionized water, vinyl acetate-acrylate copolymer and modified vinyl versatate, adding auxiliary agents such as water-based bentonite and defoaming agent, uniformly stirring, grinding, adjusting the pH value, inspecting the qualified performance, filtering and packaging.

2. The preparation method of the ultrafast dry cast pipe anticorrosive paint according to claim 1, wherein the preparation method of the modified vinyl versatate in the step (1) comprises the following steps: adding sodium carbonate, ammonium perfluorooctanoate, ammonium persulfate and deionized water into a high-pressure reaction kettle, mixing according to the mass ratio of 3:1:2: 6-5: 1:2:6 to prepare an aqueous solution, adding chlorotrifluoroethylene accounting for 0.5-0.8 times of the mass of the aqueous solution, sealing a kettle cover, introducing nitrogen accounting for 0.4-0.7 Mpa, discharging the nitrogen after reacting for 2-3 hours, vacuumizing the reaction kettle by using a circulating water pump, starting a stirrer, setting the rotating speed to be 500rpm, adding octamethylcyclotetrasiloxane accounting for 0.3-0.5 times of the mass of the chlorotrifluoroethylene and sodium bisulfite aqueous solution accounting for 4% of the mass fraction accounting for 0.2-0.3 times of the mass of the chlorotrifluoroethylene into the reaction kettle at the temperature of 25-30 ℃ to react for 10-12 hours to prepare a siloxane ethylene mixture, mixing the siloxane ethylene mixture, tertiary vinyl carbonate and the deionized water into the high-pressure polymerization reaction kettle according to the mass ratio of 2:2: 5-2: 4:5, stirring uniformly at room temperature, mixing barium sulfate with the mass of the siloxane ethylene mixture being 0.2-0.3 times that of the siloxane ethylene mixture and light calcium carbonate with the mass of the siloxane ethylene mixture being 0.2-0.3 times that of the siloxane ethylene mixture, adding the mixture into a kettle, sealing the reaction kettle, introducing nitrogen to replace air, vacuumizing, heating in a water bath at 60-70 ℃ for 2-4 hours, stopping heating after the reaction is finished, and continuing stirring until the emulsion is cooled to room temperature to obtain the modified tertiary ethylene carbonate.

3. The preparation method of the ultrafast dry cast pipe anticorrosive paint according to claim 1, wherein the preparation method of the vinyl acetate-acrylic copolymer in the step (2) is as follows: firstly, mixing and stirring vinyl acetate and BF-9011 acrylic acid dispersoid uniformly according to the mass ratio of 2: 3-2: 5 to obtain mixed emulsion, and storing for later use; adding distilled water 1-3 times of the mass of the mixed emulsion and polyvinyl alcohol 0.3-0.5 times of the mass of the mixed emulsion into a four-mouth flask provided with a mechanical stirrer, a thermometer, a reflux condenser tube and a constant-pressure dropping funnel, carrying out mixed reaction, heating to 90-100 ℃, keeping the temperature for 2-3 h, cooling to 65-60 ℃, uniformly mixing and stirring sodium dodecyl sulfate 0.1-0.2 times of the mass of the mixed emulsion, light calcium carbonate 0.2-0.3 times of the mass of the mixed emulsion and polyvinyl alcohol 0.3-0.5 times of the mass of the mixed emulsion at the temperature, adding the mixed emulsion, emulsifying for 30-40 min, adding barium sulfate 0.2-0.3 times of the mass of the polyvinyl alcohol, heating to 60-70 ℃, keeping the temperature for 1-2 h, vacuumizing for 1-1.5 h, cooling and vacuumizing at the same time, and discharging after the temperature is reduced to 30-40 ℃ to obtain the vinegar-propylene copolymer.

4. The preparation method of the anticorrosive paint for the ultrafast dry cast pipe according to claim 1, wherein the preparation method of the anticorrosive paint for the ultrafast dry cast pipe in the step (3) comprises the following steps: mixing deionized water, vinyl acetate-acrylate copolymer and modified vinyl versatate according to a mass ratio of 5:2: 2-5: 4:4, adding the mixture into a dispersion cylinder, adding 4% of water-based bentonite accounting for 0.2-0.3 times of the mass of the vinyl acetate-acrylate copolymer and an antifoaming agent accounting for 0.2-0.3 times of the mass of the vinyl acetate-acrylate copolymer, uniformly stirring, adding carbon black, iron black, zinc phosphate, aluminum tripolyphosphate, an antirust pigment, mica iron oxide and wollastonite powder while stirring, uniformly dispersing, sanding to a fineness of 20-30 mu m, transferring into a paint mixing cylinder, adding an anticorrosion mildew inhibitor, a curing agent and an anti-flash rust agent while stirring, adjusting the pH value of the paint to be neutral by using a pH regulator while stirring, adding a thickening agent accounting for 0.2-0.3 times of the mass of the vinyl acetate-acrylate copolymer after uniform stirring, filtering and packaging after the performance is qualified, thereby obtaining the ultradry cast pipe anticorrosion paint.

5. The preparation method of the ultrafast-dry cast pipe anticorrosive paint according to claim 4, characterized in that the mass ratio of the vinyl acetate-acrylic copolymer, the carbon black, the iron black, the zinc phosphate, the aluminum tripolyphosphate, the antirust pigment, the mica iron oxide and the wollastonite powder is 5:1:1:1:1: 1; the mass ratio of the vinyl acetate-acrylic copolymer to the anti-corrosion and anti-mildew agent to the curing agent to the anti-flash rust agent is 12:1:3: 1.

6. The preparation method of the ultrafast dry cast pipe anticorrosive paint according to claim 1, characterized in that the ultrafast dry cast pipe anticorrosive paint prepared by the preparation method of the ultrafast dry cast pipe anticorrosive paint mainly comprises, by weight, 50-70 parts of modified vinyl versatate, 50-70 parts of vinyl acetate-acrylate copolymer, 10-20 parts of curing agent, 5-10 parts of anticorrosion mildew preventive and 5-10 parts of flash rust preventive.

7. The paint of claim 6, wherein the modified vinyl versatate is prepared by modifying vinyl versatate with a mixture of siloxane and ethylene.

8. The paint of claim 7, wherein the siloxane vinyl mixture is prepared by mixing octamethylcyclotetrasiloxane and chlorotrifluoroethylene.

9. The paint as claimed in claim 8, wherein the vinyl acetate-co-polymer is prepared by mixing vinyl acetate and BF-9011 acrylic acid dispersion.

10. The paint as claimed in claim 9, wherein the curing agent is one of meta-phenylenediamine and aminoethyl piperazine; the antiseptic and mildew-proof agent is one of sodium benzoate and potassium sorbate; the flash rust prevention agent is CK20 flash rust prevention agent.

Technical Field

The invention relates to the technical field of new materials, in particular to a preparation method of an ultrafast dry cast pipe anticorrosive paint.

Background

With the change of science and technology, the technology of corrosion prevention of cast pipes also enters a new stage. Firstly, the corrosion-resistant work is actively changed from passive work, the corrosion-resistant material is developed according to the process requirements, so that the corrosion-resistant material and a new construction method are continuously emerged, the volatile organic compound content of the existing dry cast pipe corrosion-resistant paint is higher, the drying speed is lower, at present in industrial production, some manufacturers can only dry by heating, so that not only time is wasted, but also energy is wasted, and in view of the reasons, the special significance is achieved in researching and developing the ultrafast dry cast pipe corrosion-resistant paint.

Disclosure of Invention

The invention aims to provide a preparation method of an ultrafast dry cast pipe anticorrosive paint, which aims to solve the problems in the prior art.

In order to solve the technical problems, the invention provides the following technical scheme: the anti-corrosion paint for the ultra-fast dry cast pipe is characterized by mainly comprising the following preparation steps:

(1) preparing modified vinyl versatate: mixing a mixed aqueous solution of sodium carbonate, ammonium perfluorooctanoate and ammonium persulfate with chlorotrifluoroethylene in a high-pressure reaction kettle for reaction, adding octamethylcyclotetrasiloxane and an aqueous solution of sodium bisulfite for reaction to obtain a siloxane ethylene mixture, continuing mixing and reacting the siloxane ethylene mixture, vinyl versatate and deionized water in a high-pressure polymerization reaction kettle, adding barium sulfate and light calcium carbonate for mixing to obtain modified vinyl versatate;

(2) preparation of vinyl acetate-acrylic copolymer: mixing vinyl acetate and BF-9011 acrylic acid dispersoid, uniformly stirring to obtain mixed emulsion, adding distilled water and polyvinyl alcohol, mixing, adding sodium dodecyl sulfate and light calcium carbonate after reaction, stirring, heating and reacting to obtain a vinyl acetate-acrylic copolymer;

(3) preparing the anticorrosive paint for the ultrafast dry cast pipe: mixing deionized water, vinyl acetate-acrylate copolymer and modified vinyl versatate, adding auxiliary agents such as water-based bentonite and defoaming agent, uniformly stirring, grinding, adjusting the pH value, inspecting the qualified performance, filtering and packaging.

Further, the preparation method of the modified vinyl versatate in the step (1) comprises the following steps: adding sodium carbonate, ammonium perfluorooctanoate, ammonium persulfate and deionized water into a high-pressure reaction kettle, mixing according to the mass ratio of 3:1:2: 6-5: 1:2:6 to prepare an aqueous solution, adding chlorotrifluoroethylene accounting for 0.5-0.8 times of the mass of the aqueous solution, sealing a kettle cover, introducing nitrogen accounting for 0.4-0.7 Mpa, discharging the nitrogen after reacting for 2-3 hours, vacuumizing the reaction kettle by using a circulating water pump, starting a stirrer, setting the rotating speed to be 500rpm, adding octamethylcyclotetrasiloxane accounting for 0.3-0.5 times of the mass of the chlorotrifluoroethylene and sodium bisulfite aqueous solution accounting for 4% of the mass fraction accounting for 0.2-0.3 times of the mass of the chlorotrifluoroethylene into the reaction kettle at the temperature of 25-30 ℃ to react for 10-12 hours to prepare a siloxane ethylene mixture, mixing the siloxane ethylene mixture, tertiary vinyl carbonate and the deionized water into the high-pressure polymerization reaction kettle according to the mass ratio of 2:2: 5-2: 4:5, stirring uniformly at room temperature, mixing barium sulfate with the mass of the siloxane ethylene mixture being 0.2-0.3 times that of the siloxane ethylene mixture and light calcium carbonate with the mass of the siloxane ethylene mixture being 0.2-0.3 times that of the siloxane ethylene mixture, adding the mixture into a kettle, sealing the reaction kettle, introducing nitrogen to replace air, vacuumizing, heating in a water bath at 60-70 ℃ for 2-4 hours, stopping heating after the reaction is finished, and continuing stirring until the emulsion is cooled to room temperature to obtain the modified tertiary ethylene carbonate.

Further, the preparation method of the vinyl acetate-acrylic copolymer in the step (2) comprises the following steps: firstly, mixing and stirring vinyl acetate and BF-9011 acrylic acid dispersoid uniformly according to the mass ratio of 2: 3-2: 5 to obtain mixed emulsion, and storing for later use; adding distilled water 1-3 times of the mass of the mixed emulsion and polyvinyl alcohol 0.3-0.5 times of the mass of the mixed emulsion into a four-mouth flask provided with a mechanical stirrer, a thermometer, a reflux condenser tube and a constant-pressure dropping funnel, carrying out mixed reaction, heating to 90-100 ℃, keeping the temperature for 2-3 h, cooling to 65-60 ℃, uniformly mixing and stirring sodium dodecyl sulfate 0.1-0.2 times of the mass of the mixed emulsion, light calcium carbonate 0.2-0.3 times of the mass of the mixed emulsion and polyvinyl alcohol 0.3-0.5 times of the mass of the mixed emulsion at the temperature, adding the mixed emulsion, emulsifying for 30-40 min, adding barium sulfate 0.2-0.3 times of the mass of the polyvinyl alcohol, heating to 60-70 ℃, keeping the temperature for 1-2 h, vacuumizing for 1-1.5 h, cooling and vacuumizing at the same time, and discharging after the temperature is reduced to 30-40 ℃ to obtain the vinegar-propylene copolymer.

Further, the preparation method of the ultrafast dry cast pipe anticorrosive paint in the step (3) comprises the following steps: mixing deionized water, vinyl acetate-acrylate copolymer and modified vinyl versatate according to a mass ratio of 5:2: 2-5: 4:4, adding the mixture into a dispersion cylinder, adding 4% of water-based bentonite which is 0.2-0.3 times of the mass of the vinyl acetate-acrylate copolymer and an antifoaming agent which is 0.2-0.3 times of the mass of the vinyl acetate-acrylate copolymer, uniformly stirring, adding carbon black, iron black, zinc phosphate, aluminum tripolyphosphate, an antirust pigment, mica iron oxide and wollastonite powder while stirring, uniformly dispersing, sanding to a fineness of 20-30 mu m, transferring into a paint mixing cylinder, adding an anticorrosion mildew inhibitor, a curing agent and an anti-flash rust agent while stirring, adjusting the pH value of the paint to be neutral by using a pH regulator while stirring, uniformly stirring, then adjusting to a proper viscosity by using a thickening agent, filtering after the performance is qualified, and packaging to obtain the ultra-fast dry casting pipe anticorrosion paint.

Further, the mass ratio of the vinyl acetate-acrylic copolymer to the carbon black to the iron black to the zinc phosphate to the aluminum tripolyphosphate to the antirust pigment to the mica iron oxide to the wollastonite powder is 5:1:1:1:1: 1; the mass ratio of the vinyl acetate-acrylic copolymer to the anti-corrosion and anti-mildew agent to the curing agent to the anti-flash rust agent is 12:1:3: 1.

Further, the ultrafast dry cast pipe anticorrosive paint prepared by the preparation method of the ultrafast dry cast pipe anticorrosive paint mainly comprises, by weight, 50-70 parts of modified vinyl versatate, 50-70 parts of vinyl acetate-acrylic copolymer, 10-20 parts of curing agent, 5-10 parts of anticorrosive mildew inhibitor and 5-10 parts of flash rust inhibitor.

Furthermore, the modified ethylene versatate is prepared by modifying ethylene versatate with siloxane ethylene mixture.

Further, the siloxane vinyl mixture is prepared by mixing octamethylcyclotetrasiloxane and chlorotrifluoroethylene.

Further, the vinyl acetate-acrylic copolymer is prepared by mixing vinyl acetate and BF-9011 acrylic acid dispersoid.

Further, the curing agent is one of m-phenylenediamine and aminoethyl piperazine; the antiseptic and mildew-proof agent is one of sodium benzoate and potassium sorbate; the flash rust prevention agent is CK20 flash rust prevention agent.

Compared with the prior art, the invention has the following beneficial effects:

the invention firstly prepares vinyl versatate modified by mixing octamethylcyclotetrasiloxane and chlorotrifluoroethylene, and then modifies the mixture of vinyl acetate and BF-9011 acrylic acid dispersoid by using the modified vinyl versatate to prepare the ultrafast dry cast pipe anticorrosive paint with the matrix of the mixture of the modified vinyl acetate and the BF-9011 acrylic acid dispersoid.

The tertiary carbon group in the vinyl versatate is of an umbrella structure, and when the vinyl versatate is grafted on the vinyl acetate-propylene copolymer, the hydrophilic ester group and carboxyl in the molecular chain of the vinyl versatate can be shielded, so that the impermeability of the product can be improved; when the temperature is high, the generation rate of free radicals in the vinyl acetate-acrylic copolymer is accelerated, so that the vinyl acetate-acrylic copolymer is converted into latex particles, and the modified vinyl versatate grafted on the surface of the vinyl acetate-acrylic copolymer is attracted by the free radicals to coat the vinyl acetate-acrylic copolymer, so that the distance between particles of the vinyl acetate-acrylic copolymer is reduced, and the drying speed of a coating film is accelerated; and when the curing agent is dispersed into the particles, part of the curing agent is dispersed between the vinyl acetate-acrylate copolymer and the modified vinyl versatate, so that the crosslinking degree is improved, the particle spacing of the modified vinyl acetate-acrylate copolymer is reduced, the drying time of a coating film is shortened, and the effect of ultra-fast drying is achieved.

After the residual octamethylcyclotetrasiloxane after the vinyl versatate is modified is mixed with chlorotrifluoroethylene, a fluorosilicone emulsion with a porous core-shell structure and a narrow particle size can be formed, and when the anticorrosive paint prepared by the invention is rained, silicon hydroxyl generated by hydrolysis of siloxane groups after fluorosilicone emulsion molecules in a coating film and vinyl versatate react in water can react with hydroxyl on the surface of metal, so that the wet adhesion of the coating film is improved, and the corrosion resistance is enhanced; the octamethylcyclotetrasiloxane component in the fluorosilicone emulsion is not only crosslinked with a molecular chain segment in the vinyl acetate-acrylic copolymer, but also adsorbed on the vinyl acetate-acrylic copolymer and tightly connected with the vinyl acetate-acrylic copolymer, so that the tensile strength of a coating film is enhanced.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to more clearly illustrate the method provided by the present invention, the following examples are provided, and the test method for each index of the ultrafast dry cast pipe anticorrosive paint manufactured in the following examples is as follows:

corrosion resistance: the corrosion resistance tests are carried out on the ultrafast dry cast pipe anticorrosive paint prepared by the components of example 1, example 2 and comparative example 1; the electrochemical test adopts a three-electrode system, the auxiliary electrode is a platinum electrode, the reference electrode is a saturated calomel electrode, the working electrode is a stainless steel sheet with the thickness of 1cm multiplied by 1cm, the corrosion medium is a sodium chloride solution with the mass fraction of 3.5%, and the corrosion potential E of the ultrafast dry cast pipe anticorrosive paint prepared by the components of the examples 1, 2 and 1 are measured after the ultrafast dry cast pipe anticorrosive paint is soaked in the sodium chloride solution with the mass fraction of 3.5% for 20min_coorThe more positive, the higher the corrosion resistance.

Quick drying: carrying out quick drying test on the ultrafast dry cast pipe anticorrosive paint prepared from the components of example 1, example 2 and comparative example 1; the film forming time of the ultrafast dry cast pipe anticorrosive paint prepared by the components of example 1, example 2 and comparative example 1 is respectively timed under normal temperature and normal pressure, and the shorter the timing is, the better the quick drying property is.

Example 1

The anti-corrosion paint for the ultra-fast dry cast pipe is characterized by mainly comprising the following preparation steps:

(1) preparing modified vinyl versatate: mixing a mixed aqueous solution of sodium carbonate, ammonium perfluorooctanoate and ammonium persulfate with chlorotrifluoroethylene in a high-pressure reaction kettle for reaction, adding octamethylcyclotetrasiloxane and an aqueous solution of sodium bisulfite for reaction to obtain a siloxane ethylene mixture, continuing mixing and reacting the siloxane ethylene mixture, vinyl versatate and deionized water in a high-pressure polymerization reaction kettle, adding barium sulfate and light calcium carbonate for mixing to obtain modified vinyl versatate;

(2) preparation of vinyl acetate-acrylic copolymer: mixing vinyl acetate and BF-9011 acrylic acid dispersoid ester, uniformly stirring to obtain a mixed emulsion, adding distilled water and polyvinyl alcohol, mixing, adding sodium dodecyl sulfate and light calcium carbonate after reaction, stirring, heating and reacting to obtain a vinyl acetate-acrylic copolymer;

(3) preparing the anticorrosive paint for the ultrafast dry cast pipe: mixing deionized water, vinyl acetate-acrylate copolymer and modified vinyl versatate, adding auxiliary agents such as water-based bentonite and defoaming agent, uniformly stirring, grinding, adjusting the pH value, inspecting the qualified performance, filtering and packaging.

Further, the preparation method of the modified vinyl versatate in the step (1) comprises the following steps: adding sodium carbonate, ammonium perfluorooctanoate, ammonium persulfate and deionized water into a high-pressure reaction kettle, mixing according to a mass ratio of 5:1:2:6 to prepare an aqueous solution, adding chlorotrifluoroethylene with the mass of 0.8 time of that of the aqueous solution, sealing a kettle cover, introducing nitrogen with the pressure of 0.7Mpa, reacting for 3 hours, then discharging the nitrogen, vacuumizing the reaction kettle by using a circulating water pump, starting a stirrer, setting the rotating speed at 500rpm, adding octamethylcyclotetrasiloxane with the mass of 0.5 time of that of the chlorotrifluoroethylene and sodium bisulfite aqueous solution with the mass fraction of 4 percent with the mass of 0.3 time of that of the chlorotrifluoroethylene into the high-pressure polymerization kettle at 30 ℃, uniformly stirring at room temperature, mixing barium sulfate with the mass of 0.3 time of the siloxane ethylene mixture and light calcium carbonate with the mass of 0.3 time of the siloxane ethylene mixture into the kettle according to a mass ratio of 2:4:5, and (3) sealing the reaction kettle, introducing nitrogen to replace air, vacuumizing, heating in a water bath at 70 ℃ for 4h, stopping heating after the reaction is finished, and continuously stirring until the emulsion is cooled to room temperature to obtain the modified vinyl versatate.

Further, the preparation method of the vinyl acetate-acrylic copolymer in the step (2) comprises the following steps: firstly, mixing and stirring vinyl acetate and BF-9011 acrylic acid dispersoid uniformly according to the mass ratio of 2:5 to obtain mixed emulsion, and storing for later use; adding distilled water with the mass being 3 times of that of the mixed emulsion and polyvinyl alcohol with the mass being 0.5 time of that of the mixed emulsion into a four-neck flask provided with a mechanical stirrer, a thermometer, a reflux condenser tube and a constant pressure dropping funnel for mixing reaction, heating to 100 ℃, keeping the temperature for 3 hours, cooling to 60 ℃, mixing and stirring sodium dodecyl sulfate with the mass being 0.2 time of that of the mixed emulsion, light calcium carbonate with the mass being 0.3 time of that of the mixed emulsion and polyvinyl alcohol with the mass being 0.5 time of that of the mixed emulsion uniformly at the temperature, adding the mixed emulsion, emulsifying for 40 minutes, adding barium sulfate with the mass being 0.3 time of that of the polyvinyl alcohol, heating to 70 ℃, keeping the temperature for 2 hours, vacuumizing for 1.5 hours, cooling and vacuumizing at the same time, and discharging after the temperature is reduced to 40 ℃ to obtain the vinyl acetate-propylene copolymer.

Further, the preparation method of the ultrafast dry cast pipe anticorrosive paint in the step (3) comprises the following steps: mixing deionized water, vinyl acetate-acrylate copolymer and modified vinyl versatate according to the mass ratio of 5:4:4, adding 4% of water-based bentonite with the mass of 0.3 time of that of the vinyl acetate-acrylate copolymer and an antifoaming agent with the mass of 0.3 time of that of the vinyl acetate-acrylate copolymer into a dispersion cylinder, uniformly stirring, adding carbon black, iron black, zinc phosphate, aluminum tripolyphosphate, an antirust pigment, mica iron oxide and wollastonite powder while stirring, uniformly dispersing, sanding to the fineness of 30 mu m, transferring into a paint mixing cylinder, adding sodium benzoate, m-phenylenediamine and a CK20 flash rust inhibitor while stirring, adjusting the pH value of the paint to be neutral by using a pH regulator while stirring, uniformly stirring, adjusting the pH value to be proper by using a thickening agent after stirring uniformly, filtering and packaging after the performance is qualified, thus obtaining the ultrafast-dried cast pipe anticorrosive paint.

Further, the mass ratio of the vinyl acetate-acrylic copolymer to the carbon black to the iron black to the zinc phosphate to the aluminum tripolyphosphate to the antirust pigment to the mica iron oxide to the wollastonite powder is 5:1:1:1:1: 1; the mass ratio of the vinyl acetate-acrylic copolymer to the sodium benzoate to the m-phenylenediamine to the CK20 flash rust inhibitor is 12:1:3: 1.

Furthermore, the ultrafast dry cast pipe anticorrosive paint prepared by the preparation method mainly comprises, by weight, 70 parts of modified vinyl versatate, 70 parts of vinyl acetate-acrylate copolymer, 20 parts of curing agent, 10 parts of anticorrosive mildew inhibitor and 10 parts of flash rust inhibitor.

Example 2

The anti-corrosion paint for the ultra-fast dry cast pipe is characterized by mainly comprising the following preparation steps:

(1) preparing modified vinyl versatate: mixing a mixed aqueous solution of sodium carbonate, ammonium perfluorooctanoate and ammonium persulfate with chlorotrifluoroethylene in a high-pressure reaction kettle for reaction, adding octamethylcyclotetrasiloxane and an aqueous solution of sodium bisulfite for reaction to obtain a siloxane ethylene mixture, continuing mixing and reacting the siloxane ethylene mixture, vinyl versatate and deionized water in a high-pressure polymerization reaction kettle, adding barium sulfate and light calcium carbonate for mixing to obtain modified vinyl versatate;

(2) preparation of vinyl acetate-acrylic copolymer: mixing vinyl acetate and BF-9011 acrylic acid dispersoid, uniformly stirring to obtain mixed emulsion, adding distilled water and polyvinyl alcohol, mixing, adding sodium dodecyl sulfate and light calcium carbonate after reaction, stirring, heating and reacting to obtain a vinyl acetate-acrylic copolymer;

(3) preparing the anticorrosive paint for the ultrafast dry cast pipe: mixing deionized water, vinyl acetate-acrylate copolymer and modified vinyl versatate, adding auxiliary agents such as water-based bentonite and defoaming agent, uniformly stirring, grinding, adjusting the pH value, inspecting the qualified performance, filtering and packaging.

Further, the preparation method of the modified vinyl versatate in the step (1) comprises the following steps: adding sodium carbonate, ammonium perfluorooctanoate, ammonium persulfate and deionized water into a high-pressure reaction kettle, mixing according to the mass ratio of 3:1:2:6 to prepare an aqueous solution, adding chlorotrifluoroethylene with the mass of 0.5 time of that of the aqueous solution, sealing a kettle cover, introducing nitrogen with the mass ratio of 0.4Mpa, discharging the nitrogen after reacting for 2 hours, vacuumizing the reaction kettle by using a circulating water pump, starting a stirrer, setting the rotating speed at 500rpm, adding octamethylcyclotetrasiloxane with the mass of 0.3 time of that of the chlorotrifluoroethylene and sodium bisulfite aqueous solution with the mass fraction of 4 percent with the mass of 0.2 time of that of the chlorotrifluoroethylene into the reaction kettle at 25 ℃, mixing the siloxane ethylene mixture, vinyl versatate and deionized water into the high-pressure polymerization reaction kettle according to the mass ratio of 2:2:5, stirring uniformly at room temperature, mixing barium sulfate with the mass of the siloxane ethylene mixture and light calcium carbonate with the mass of 0.2 time of the siloxane ethylene mixture into the kettle, and (3) sealing the reaction kettle, introducing nitrogen to replace air, vacuumizing, heating in a water bath at 60 ℃ for 2h, stopping heating after the reaction is finished, and continuously stirring until the emulsion is cooled to room temperature to obtain the modified vinyl versatate.

Further, the preparation method of the vinyl acetate-acrylic copolymer in the step (2) comprises the following steps: firstly, mixing and stirring vinyl acetate and BF-9011 acrylic acid dispersoid uniformly according to the mass ratio of 2:3 to obtain mixed emulsion, and storing for later use; adding distilled water 1 time of the mass of the mixed emulsion and polyvinyl alcohol 0.3 time of the mass of the mixed emulsion into a four-neck flask provided with a mechanical stirrer, a thermometer, a reflux condenser tube and a constant pressure dropping funnel, mixing and reacting, heating to 90 ℃, keeping the temperature for 2 hours, cooling to 65 ℃, mixing and stirring sodium dodecyl sulfate 0.1 time of the mass of the mixed emulsion, light calcium carbonate 0.2 time of the mass of the mixed emulsion and polyvinyl alcohol 0.3 time of the mass of the mixed emulsion uniformly at the temperature, adding the mixed emulsion, emulsifying for 30 minutes, adding barium sulfate 0.2 time of the mass of the polyvinyl alcohol, heating to 60 ℃, keeping the temperature for 1 hour, vacuumizing for 1 hour, cooling and vacuumizing simultaneously, discharging after the temperature is reduced to 30 ℃, and obtaining the vinyl acetate-acrylic copolymer.

Further, the preparation method of the ultrafast dry cast pipe anticorrosive paint in the step (3) comprises the following steps: mixing deionized water, vinyl acetate-acrylate copolymer and modified vinyl versatate according to the mass ratio of 5:2:2, adding 4% of water-based bentonite with the mass of 0.2 time of that of the vinyl acetate-acrylate copolymer and an antifoaming agent with the mass of 0.2 time of that of the vinyl acetate-acrylate copolymer into a dispersion cylinder, uniformly stirring, adding carbon black, iron black, zinc phosphate, aluminum tripolyphosphate, an anti-rust pigment, mica iron oxide and wollastonite powder while stirring, uniformly dispersing, sanding to the fineness of 20 mu m, transferring into a paint mixing cylinder, adding sodium benzoate, m-phenylenediamine and a CK20 flash rust inhibitor while stirring, adjusting the pH value of the paint to be neutral by using a pH regulator while stirring, uniformly stirring, adjusting the pH value to be proper by using a thickening agent after stirring uniformly, testing the performance to be qualified, filtering and packaging to obtain the ultrafast dry casting pipe anticorrosive paint.

Further, the mass ratio of the vinyl acetate-acrylic copolymer to the carbon black to the iron black to the zinc phosphate to the aluminum tripolyphosphate to the antirust pigment to the mica iron oxide to the wollastonite powder is 5:1:1:1:1: 1; the mass ratio of the vinyl acetate-acrylic copolymer to the sodium benzoate to the m-phenylenediamine to the CK20 flash rust inhibitor is 12:1:3: 1.

Furthermore, the ultrafast dry cast pipe anticorrosive paint prepared by the preparation method mainly comprises, by weight, 50 parts of modified vinyl versatate, 50 parts of vinyl acetate-acrylate copolymer, 10 parts of curing agent, 5 parts of anticorrosive mildew inhibitor and 5 parts of flash rust inhibitor.

Comparative example 1

The formulation of comparative example 1 was the same as example 1. The preparation method of the ultra-fast dry cast pipe anticorrosive paint is different from that of the example 1 only in that the preparation process of the step (1) is not carried out, and the rest of the preparation steps are the same as the example 1.

Comparative example 2

The formulation of comparative example 1 was the same as example 1. The preparation method of the ultra-fast dry cast pipe anticorrosive paint is different from that of the example 1 only in that the preparation process of the step (2) is not carried out, and the rest of the preparation steps are the same as those of the example 1.

Effect example 1

The following table 1 shows the results of the corrosion resistance test of the anticorrosive paint for ultrafast dry cast pipes obtained in examples 1 and 2 of the present invention and comparative example 1.

TABLE 1

As can be seen from the above table, the corrosion resistance of examples 1 and 2 is better, which indicates that the siloxane groups formed by the reaction between the fluorosilicone emulsion molecules in the coating film and the vinyl versatate can be hydrolyzed in water to generate silicon hydroxyl groups, which can react with the hydroxyl groups on the metal surface, thereby improving the wet adhesion of the coating film and enhancing the corrosion resistance.

Effect example 2

The following table 2 shows the results of the quick-drying performance test of the anticorrosive paint for ultrafast dry cast pipes obtained in examples 1 and 2 of the present invention and comparative example 2.

TABLE 2

	Time (min)
		Example 1	45
Example 2	40
		Comparative example 2	95

As can be seen from the above table, the fast drying property in examples 1 and 2 is good, which indicates that the generation rate of free radicals in the vinyl acetate-acrylic copolymer is increased, so that the vinyl acetate-acrylic copolymer is converted into latex particles, and the modified vinyl versatate grafted on the surface of the vinyl acetate-acrylic copolymer is attracted by the free radicals to coat the vinyl acetate-acrylic copolymer, so that the distance between particles of the vinyl acetate-acrylic copolymer is reduced, and the drying speed of a coating film is increased; and when the curing agent is dispersed into the particles, part of the curing agent is dispersed between the vinyl acetate-acrylate copolymer and the modified vinyl versatate, so that the crosslinking degree is improved, the particle spacing of the modified vinyl acetate-acrylate copolymer is reduced, the drying time of a coating film is shortened, and the effect of ultra-fast drying is achieved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.