CN115029048A - Water-based epoxy primer for interior decoration of rolling stock and preparation method thereof - Google Patents

Abstract

The invention relates to a water-based epoxy primer for interior decoration of a locomotive and a preparation method thereof, belonging to the technical field of paint preparation.A paint part is prepared by adopting water-based epoxy emulsion, water-based inorganic hybrid organic silicon acrylic resin, a purifying filler, an anti-rust pigment, an auxiliary agent, a cosolvent and deionized water; preparing a curing agent component from a waterborne epoxy curing agent, deionized water and a solvent; the paint and the curing agent are mixed according to the weight ratio of 6:1 during construction, and a proper amount of deionized water can be added during construction to adjust the construction viscosity. The invention is mainly used for the construction of workpieces such as the interior of a locomotive vehicle, the base material of the interior part is carbon steel, aluminum alloy, glass fiber reinforced plastic and the like, the water-based epoxy primer has good adhesive force on the surface of each base material, the paint film is fast to dry and high in hardness, the salt spray resistance and water resistance are good, the discharge amount of VOC is low, and in addition, the paint film is fast to dry and high in initial hardness, so that the invention is suitable for fast loading and transporting of the interior part, and the working efficiency is improved.

Description

Water-based epoxy primer for interior decoration of rolling stock and preparation method thereof

Technical Field

The invention relates to a water-based paint suitable for interior decoration of rolling stock, in particular to a water-based epoxy primer for interior decoration of rolling stock and a preparation method thereof.

Background

With the increase of environmental protection, the coating industry is changed from the former solvent type coating products into water-based coating products, and the water-based coating does not contain organic solvents in the construction process and uses water as a diluent, thereby greatly reducing the VOC emission of coating construction and simultaneously improving the working environment of coating workers. In recent years, the coating in the field of rail transit also starts to be water-based, and particularly, in the coating construction of vehicle interiors, electric appliance cabinets and the like, a paint film is required to have good adhesion to various base materials, the product is more environment-friendly, the discharge of VOC is low, and the paint film has good water resistance, chemical resistance, salt mist resistance and higher paint film hardness. Meanwhile, in the coating process, rapid drying and carrying are needed, and high-efficiency construction efficiency is needed. The traditional solvent-based paint construction has high VOC emission, the TVOC content in the later period is not small, the influence on the body health of drivers and passengers in a vehicle is caused, the problems of slow drying, poor adhesion of a primer on base materials such as aluminum alloy or glass fiber reinforced plastic and the like exist, the quality problem of the coating process is more, and the coating process does not meet the requirement of interior parts of a locomotive vehicle, so that the primer for interior parts of the locomotive vehicle with low VOC is the technical problem to be solved at present.

Disclosure of Invention

The invention aims to provide the water-based epoxy primer which has good adhesive force to a base material, salt mist resistance, water resistance, chemical resistance and high film hardness, and meanwhile, the water-based epoxy primer has low VOC (volatile organic compounds) emission in the product coating process, is quick to dry and can be quickly circulated and carried, thereby meeting the requirements of coating construction processes of interior trims, cabinets and the like of locomotives and vehicles.

The purpose of the invention can be realized by the following technical scheme:

a water-based epoxy primer for interior decoration of rolling stock consists of paint and a curing agent;

the paint comprises the following raw materials in parts by weight: 35-45 parts of water-based epoxy emulsion, 6-8 parts of water-based inorganic hybrid organic silicon acrylic resin, 0.5-0.8 part of fumed silica, 2.0-2.5 parts of anionic polymer dispersant, 0.8-1.0 part of nonionic surfactant, 0.2-0.3 part of polysiloxane defoaming agent, 0.3-0.5 part of polyether siloxane wetting agent, 0.3-0.4 part of acrylate flatting agent, 15-20 parts of purifying filler, 15-20 parts of antirust pigment, 0.3-0.5 part of polyurethane associative thickener, 1.0-1.5 parts of cosolvent, 0.8-1.0 part of flash rust inhibitor and 10-15 parts of deionized water.

The curing agent comprises the following raw materials in parts by weight: 45-50 parts of a water-based epoxy curing agent, 35-45 parts of deionized water and 10-15 parts of propylene glycol methyl ether;

the water-based epoxy primer for the interior decoration of the locomotive vehicle is prepared by the following steps:

firstly, pouring deionized water into a container cylinder according to a formula, placing the container cylinder under a dispersion machine for dispersion, adjusting the rotating speed to be 800-;

secondly, pumping the pre-dispersed slurry into a sand mill by using a diaphragm pump, grinding the pre-dispersed slurry until the fineness is less than or equal to 20 mu m, discharging the material to obtain sand-milled slurry, diluting the water-based inorganic hybrid organic silicon acrylic resin by using propylene glycol methyl ether, adding the diluted water-based inorganic hybrid organic silicon acrylic resin, the water-based epoxy emulsion, the polyether siloxane wetting agent, the acrylate flatting agent and the polyurethane association type thickening agent into the sand-milled slurry, after the material is added, adjusting the rotating speed of a dispersion machine to be 1000-containing materials 1200r/min, stirring the mixture for 10 to 15min, finally adding the anti-flash rust agent and the cosolvent, stirring the mixture for 10 to 15min, filtering the mixture by using a 120-mesh filter screen, and removing mechanical impurities to obtain the paint;

step three, preparation of a curing agent: adding a waterborne epoxy curing agent and deionized water in the formula into a container cylinder, adding propylene glycol methyl ether under stirring, and stirring at the rotation speed of 1000-1200r/min for 5-10min to obtain a curing agent;

fourthly, mixing the paint and the curing agent according to the mass ratio of 6:1 stirring and mixing, and adjusting the construction viscosity by using deionized water to obtain the water-based epoxy primer for the interior decoration of the locomotive vehicle.

Further, the specific process of diluting the water-based inorganic hybrid organic silicon acrylic resin comprises the following steps: and adding propylene glycol methyl ether into the water-based inorganic hybrid organic silicon acrylic resin to ensure that the mass fraction of the water-based inorganic hybrid organic silicon acrylic resin is 75%.

Further, the purifying filler is prepared by the following steps:

step S1, dissolving titanyl sulfate in deionized water, stirring for 8 hours to form 0.4mol/L titanyl sulfate solution, adding diatomite, stirring for 10 minutes, dropwise adding 10% by mass of ammonia water solution under the ice-water bath condition until the pH value is 6, stirring for 15 minutes, performing suction filtration, washing a filter cake with distilled water until no precipitation product is added in the washing solution, dropwise adding 10% by mass of barium chloride solution, drying the filter cake in an oven at 80 ℃ to constant weight, calcining in a muffle furnace at 600 ℃ for 2-3 hours, naturally cooling to room temperature, and taking out to obtain TiO ₂ The dosage ratio of the diatomite to the titanyl sulfate solution is 1 g: 100-120 mL;

step S2, adding absolute ethyl alcohol, distilled water and TiO ₂ Adding the diatomite composite material into a single-neck flask, uniformly stirring, adding a coupling agent KH-590, adjusting the pH to 3-4 by using a hydrochloric acid solution with the concentration of 0.1mol/L, carrying out ultrasonic treatment for 1h, stirring and reacting at 70 ℃ for 6-8h, after the reaction is finished, carrying out suction filtration, washing a filter cake with deionized water until the washing solution is neutral, and drying to obtain the sulfhydrylated TiO ₂ /diatomite composite material, absolute ethyl alcohol, distilled water and TiO ₂ The dosage ratio of the diatomite composite material to the coupling agent KH-590 is 50-60 mL: 20-30 mL: 4.7-5.1 g: 0.15-0.25 g;

step S3, thiolating the TiO ₂ Mixing the diatomite composite material, the sulfydryl-alkyne reaction monomer and DMF (dimethyl formamide) and carrying out ultrasonic oscillation for 20-30min, adding benzoin dimethyl ether and carrying out ultrasonic oscillation for 10min, then radiating for 0.8-1h under a 0.5-1kW high-pressure mercury lamp, after the reaction is finished, carrying out ultrasonic oscillation for 10min, then carrying out reduced pressure suction filtration, washing and drying a filter cake to obtain a purified filler, namely sulfhydrylated TiO ₂ The dosage ratio of the diatomite composite material, the mercapto-alkyne reaction monomer and the DMF is 2.5-2.8 g: 0.2-0.3 g: 30-40mL of benzoin dimethyl ether with the dosage of sulfhydrylation TiO ₂ The mass sum of the diatomite composite material and the mercapto-alkyne reaction monomer is 2-3%.

Further, the mercapto-alkyne reaction monomer is prepared by the following steps:

adding trihydroxymethyl aminomethane, p-toluenesulfonic acid and cyclohexane into a three-neck flask provided with an oil-water separator and a condenser tube, dropwise adding 3-mercaptopropionic acid after magnetic stirring, tracking by TLC until the reaction of the trihydroxymethyl aminomethane is complete, cooling to room temperature, washing with deionized water, extracting with n-hexane, drying an organic layer with anhydrous magnesium sulfate, filtering to remove the anhydrous magnesium sulfate, and removing the n-hexane by rotary evaporation to obtain a mercapto-alkyne reaction monomer, wherein the molar ratio of the trihydroxymethyl aminomethane to the 3-mercaptopropionic acid is 0.1: 0.32-0.35, wherein the dosage of the p-toluenesulfonic acid is 2 percent of the mass sum of the trihydroxymethyl aminomethane and the 3-mercaptopropionic acid.

Furthermore, the cosolvent is one or more of ethylene glycol butyl ether, dipropylene glycol butyl ether and propylene glycol methyl ether which are mixed according to any proportion.

Further, the anti-rust pigment is one or two of zinc phosphate and aluminum tripolyphosphate which are mixed according to any proportion.

The invention has the beneficial effects that:

1. the salt spray resistance of a paint film is more than or equal to 720h, the water resistance (40 ℃) is more than or equal to 48h, a water-based epoxy curing agent is matched with the mixture of water-based epoxy resin and water-based inorganic hybrid organic silicon acrylic resin, epoxy-carboxyl cross-linked paint is generated in cross-linking reaction, the reaction is not only at the chain end of the epoxy resin, but also the intermolecular epoxy group can participate in the reaction, so that the cross-linking is more complete, and the product has high salt spray resistance and water resistance.

2. The adhesive force (lattice division) of a paint film on various base materials (carbon steel, aluminum alloy, glass fiber reinforced plastic and the like) is less than or equal to 1 grade, the water-based inorganic hybrid organic silicon acrylic resin is a novel film-forming substance which is obtained by carrying out hybrid modification on an organic silicon acrylic polymer by an inorganic substance and is similar to an IPN interpenetrating network structure, wherein a plurality of inorganic micromolecules exist, a large number of polar groups have strong attraction force with the surface of the base materials, so that the firmness of the resin and the base materials is good, the paint film has excellent adhesive force on various base materials, and meanwhile, carboxyl in the molecules and epoxy groups in epoxy molecular chains can carry out slow cross-linking reaction.

3. The initial hardness of the paint film is high, the surface drying time of the primer paint film is up to 1-2 hours compared with the surface drying time of the traditional epoxy-polyamide curing system, and the surface drying time of the primer paint film is fast (room temperature 23 ℃): the resin can be dried by touch within 40 minutes, and the hardness at the initial stage is increased quickly by adopting the high-TG-value water-based epoxy resin, so that the shipping period of the workpiece can be shortened.

5. The paint film has stable storage and good anti-sagging performance, the fumed silica and the associative polyurethane thickener are selected, the paint does not settle and agglomerate after long-term storage, and the wet film is not easy to flow and fall during spraying.

6, the VOC content is low, the solvent odor is not generated, the used resin is water-based epoxy emulsion and water-based epoxy curing agent resin with high solid content, the cosolvent dosage is not more than 5 percent, the used solvent is deionized water, the real environment-friendly water-based paint is prepared, and the paint is added with a purifying filler, firstly, diatomite is used as a carrier, titanyl sulfate is used as a titanium source, a precursor is prepared by adopting a hydrolysis precipitation method, and TiO is obtained by calcining ₂ The diatomite composite material overcomes the problem that the traditional titanium dioxide added in paint is easy to agglomerate and difficult to disperse, improves the catalytic degradation of the paint to VOC by utilizing the photocatalytic activity of nano-silica, reduces the content of VOC, ensures the health and harmlessness of the surrounding environment of a paint film, then utilizes a coupling agent KH-590 to modify the surface of the composite material to ensure that the surface of the composite material is rich in sulfhydryl groups, then utilizes click reaction to graft hyperbranched polymer with a large number of active groups at the tail end on the surface of the composite material, and the hyperbranched polymer containsHas unsaturated double bonds and sulfydryl, can be crosslinked and cured with the unsaturated double bonds in the water-based inorganic hybrid organic silicon acrylic resin, improves the compactness of a paint film, and is applied to TiO ₂ A transition layer is formed between the diatomite composite material and the paint, so that the interface defects are reduced, when a paint film is impacted by external force, the purification raw materials can be used as stress dispersion points, the generation of cracks of the paint film is reduced, and the mechanical property of the paint film is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of the preparation of a water-based epoxy primer for interior finishing of a rolling stock according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.

Some of the starting materials used in the following examples:

the aqueous epoxy emulsion is

EP304 epoxy emulsion, produced by Guangdong fig mountain environmental protection science and technology Limited;

aqueous inorganic hybrid ofThe organic silicon acrylic resin is Gturlau ^TM X-150 aqueous inorganic hybrid organic silicon acrylic resin, produced by new Jili aqueous material science and technology (Zhuhai) Co.Ltd;

fumed silica, produced by the company degussa, germany;

anionic polymeric dispersants, manufactured by TEGO, Germany;

nonionic surfactant, produced by Germany winning and creating Special chemical Co., Ltd;

silicone antifoam, produced by BYK, Germany;

polyether siloxane-based wetting agents, manufactured by TEGO, Germany;

the polyurethane associative thickener is

U905 polyurethane associative thickener, produced by Wanhua chemical group, Inc., China;

an acrylate leveling agent, produced by BYK company of Germany;

flash rust inhibitor, tager polymer technologies, inc;

cosolvent, manufactured by Kamm industries, Shanghai;

aqueous epoxy curing agent

GZ04, produced by Guangdong fig mountain environmental protection science and technology Co., Ltd;

propylene glycol methyl ether, manufactured by Kame industries, Shanghai Co., Ltd.

Example 1

This example provides a thiol-alkyne reaction monomer made by the following steps:

adding 0.1mol of tris (hydroxymethyl) aminomethane, p-toluenesulfonic acid and 220mL of cyclohexane into a three-neck flask provided with an oil-water separator and a condenser tube, stirring by magnetic force, dropwise adding 0.32mol of 3-mercaptopropionic acid, tracking by TLC until the tris (hydroxymethyl) aminomethane is reacted completely, cooling to room temperature, washing with deionized water, extracting with n-hexane, drying an organic layer with anhydrous magnesium sulfate, filtering to remove anhydrous magnesium sulfate, and removing the n-hexane by rotary evaporation to obtain a mercapto-alkyne reaction monomer, wherein the dosage of the p-toluenesulfonic acid is 2% of the mass sum of the tris (hydroxymethyl) aminomethane and the 3-mercaptopropionic acid.

Example 2

This example provides a thiol-alkyne reaction monomer made by the following steps:

adding 0.1mol of tris (hydroxymethyl) aminomethane, p-toluenesulfonic acid and 250mL of cyclohexane into a three-neck flask with an oil-water separator and a condenser pipe, dropwise adding 0.35mol of 3-mercaptopropionic acid after magnetic stirring, tracking by TLC until tris (hydroxymethyl) aminomethane completely reacts, cooling to room temperature, washing with deionized water, extracting with n-hexane, drying an organic layer with anhydrous magnesium sulfate, filtering to remove anhydrous magnesium sulfate, and removing n-hexane by rotary evaporation to obtain a mercapto-alkyne reaction monomer, wherein the dosage of p-toluenesulfonic acid is 2% of the sum of the mass of tris (hydroxymethyl) aminomethane and 3-mercaptopropionic acid.

Example 3

The embodiment provides a purification filler, which is prepared by the following steps:

step S1, dissolving titanyl sulfate in deionized water, stirring for 8 hours to form 0.4mol/L titanyl sulfate solution, adding diatomite, stirring for 10 minutes, dropwise adding 10% by mass of ammonia water solution under the ice-water bath condition until the pH value is 6, stirring for 15 minutes, performing suction filtration, washing a filter cake with distilled water until no precipitation product is added in the washing solution, dropwise adding 10% by mass of barium chloride solution, drying the filter cake in an oven at 80 ℃ to constant weight, calcining the filter cake in a muffle furnace at 600 ℃ for 2 hours, naturally cooling to room temperature, and taking out to obtain TiO ₂ The dosage ratio of the diatomite to the titanyl sulfate solution is 1 g: 100 mL;

step S2, mixing 50mL of absolute ethanol, 20mL of distilled water and 4.7g of TiO ₂ Adding the diatomite composite material into a single-neck flask, uniformly stirring, adding 0.15g of coupling agent KH-590, adjusting the pH to 3 by using a hydrochloric acid solution with the concentration of 0.1mol/L, carrying out ultrasonic treatment for 1h, stirring at 70 ℃ for reaction for 6h, after the reaction is finished, carrying out suction filtration, washing a filter cake by using deionized water until a washing solution is neutral, and drying to obtain the sulfhydrylation TiO ₂ A diatomite composite material;

step S32.5g of thiolated TiO ₂ Mixing diatomite composite material, 0.2g of sulfydryl-alkyne reaction monomer in example 1 and 30mL of DMF, performing ultrasonic oscillation for 20min, adding benzoin dimethyl ether, performing ultrasonic oscillation for 10min, radiating for 0.8h under a 0.5kW high-pressure mercury lamp, performing reduced pressure suction filtration after the reaction is finished, performing washing and drying on a filter cake to obtain a purified filler, wherein the dosage of the benzoin dimethyl ether is sulfhydrylated TiO ₂ The mass sum of the diatomite composite material and the mercapto-alkyne reaction monomer is 2 percent.

Example 4

The embodiment provides a purification filler, which is prepared by the following steps:

step S1, dissolving titanyl sulfate in deionized water, stirring for 8h to form 0.4mol/L titanyl sulfate solution, adding diatomite, stirring for 10min, dropwise adding 10% ammonia water solution under the ice-water bath condition until the pH value is 6, stirring for 15min, suction filtering, washing filter cakes with distilled water until no precipitation product is added in the washing solution, drying the filter cakes in an oven at 80 ℃ to constant weight, calcining at 600 ℃ in a muffle furnace for 3h, naturally cooling to room temperature, and taking out to obtain TiO ₂ The dosage ratio of the diatomite to the titanyl sulfate solution is 1 g: 120 mL;

step S2, mixing 60mL of absolute ethanol, 30mL of distilled water and 5.1g of TiO ₂ Adding the diatomite composite material into a single-neck flask, uniformly stirring, adding 0.25g of coupling agent KH-590, adjusting the pH to 4 by using a hydrochloric acid solution with the concentration of 0.1mol/L, carrying out ultrasonic treatment for 1h, stirring at 70 ℃ for reaction for 8h, after the reaction is finished, carrying out suction filtration, washing a filter cake by using deionized water until a washing solution is neutral, and drying to obtain the sulfhydrylation TiO ₂ A diatomite composite material;

step S3, 2.8g of thiolated TiO ₂ Mixing 0.3g of sulfhydryl-alkyne reaction monomer in example 2 and 40mL of DMF, ultrasonically oscillating for 30min, adding benzoin dimethyl ether, ultrasonically oscillating for 10min, radiating for 1h under a 1kW high-pressure mercury lamp, ultrasonically oscillating for 10min after the reaction is finished, decompressing and filtering, washing and drying a filter cake to obtain the purified filler, wherein the amount of the benzoin dimethyl ether is sulfhydrylated TiO ₂ Diatomite composite material3% of the mass of the mercapto-alkyne reaction monomer.

Comparative example 1

The TiO of example 3 ₂ The diatomite composite material is replaced by the nano titanium dioxide, and the other raw materials and the preparation process are the same as those in the example 3.

Comparative example 2

The TiO of example 4 ₂ The diatomite composite material is replaced by diatomite, and the other raw materials and the preparation process are the same as those in example 4.

Comparative example 3

This comparative example is the material obtained in step S2 of example 3.

Example 5

Referring to fig. 1, the embodiment provides a water-based epoxy primer for interior decoration of a rolling stock, which is composed of a paint material and a curing agent;

the paint comprises the following raw materials in parts by weight: 35 parts of water-based epoxy emulsion, 6 parts of water-based inorganic hybrid organic silicon acrylic resin, 0.5 part of fumed silica, 2.0 parts of anionic polymer dispersant, 0.8 part of nonionic surfactant, 0.2 part of polysiloxane defoamer, 0.3 part of polyether siloxane wetting agent, 0.3 part of acrylate flatting agent, 15 parts of purification filler in example 3, 15 parts of aluminum tripolyphosphate, 0.3 part of polyurethane associated thickener, 1.0 part of cosolvent, 0.8 part of flash rust inhibitor and 10 parts of deionized water.

The curing agent comprises the following raw materials in parts by weight: 45 parts of water-based epoxy curing agent, 35 parts of deionized water and 10 parts of propylene glycol methyl ether;

the waterborne epoxy primer for the interior decoration of the locomotive vehicle is prepared by the following steps:

pouring deionized water into a container cylinder according to a formula, placing the container cylinder under a dispersion machine for dispersion, adjusting the rotating speed to 500r/min, sequentially adding an anionic polymer dispersant, fumed silica, a nonionic surfactant, a polysiloxane antifoaming agent, a purification filler and aluminum tripolyphosphate in a stirring state, adjusting the rotating speed of the dispersion machine to 1000r/min after the addition is finished, and stirring for 20min to obtain pre-dispersion slurry;

pumping the pre-dispersed slurry into a sand mill by using a diaphragm pump, grinding the pre-dispersed slurry until the fineness is less than or equal to 20 mu m, discharging to obtain sand-milled slurry, diluting the water-based inorganic hybrid organic silicon acrylic resin by using propylene glycol methyl ether, adding the diluted water-based inorganic hybrid organic silicon acrylic resin, the water-based epoxy emulsion, the polyether siloxane wetting agent, the acrylate flatting agent and the polyurethane associated thickener into the sand-milled slurry, after the feeding is finished, adjusting the rotating speed of a dispersion machine to be 1000r/min, stirring for 10min, finally adding the anti-flash rust agent and the cosolvent, stirring for 10min, filtering by using a 120-mesh filter screen, and removing mechanical impurities to obtain a paint vehicle;

step three, preparation of a curing agent: adding a waterborne epoxy curing agent and deionized water in the formula into a container cylinder, adding propylene glycol methyl ether at 500r/min, and stirring at the rotating speed of 1000r/min for 5min to obtain a curing agent;

fourthly, mixing the paint and the curing agent according to the mass ratio of 6:1 stirring and mixing, and adjusting the construction viscosity by using deionized water to obtain the water-based epoxy primer for the interior decoration of the locomotive vehicle.

The specific process for diluting the water-based inorganic hybrid organic silicon acrylic resin comprises the following steps: and adding propylene glycol methyl ether into the aqueous inorganic hybrid organic silicon acrylic resin to ensure that the mass fraction of the aqueous inorganic hybrid organic silicon acrylic resin is 75 percent.

The cosolvent is dipropylene glycol butyl ether, is an environment-friendly alcohol ether ester high-boiling-point solvent, has excellent dissolving capacity, can reduce the glass transition temperature of an emulsion polymer, and effectively improves the adhesive force of a paint film, and the flash rust inhibitor is an organic carboxylate flash rust inhibitor, can generate a layer of passivation film on the surface of a substrate, prevents air, moisture and the substrate from being subjected to electrochemical corrosion, is different from the traditional nitrite flash rust inhibitor, is not easy to hydrolyze, and ensures the excellent salt spray resistance and water resistance of the paint film.

Example 6

The embodiment provides a water-based epoxy primer for interior decoration of a locomotive vehicle, which consists of paint and a curing agent;

the paint comprises the following raw materials in parts by weight: 40 parts of water-based epoxy emulsion, 7 parts of water-based inorganic hybrid organic silicon acrylic resin, 0.7 part of fumed silica, 2.3 parts of anionic polymer dispersant, 0.9 part of nonionic surfactant, 0.2 part of polysiloxane defoamer, 0.4 part of polyether siloxane wetting agent, 0.3 part of acrylate flatting agent, 18 parts of purifying filler in example 4, 18 parts of antirust pigment, 0.4 part of polyurethane associated thickener, 1.2 parts of cosolvent, 0.9 part of flash rust inhibitor and 12 parts of deionized water.

The curing agent comprises the following raw materials in parts by weight: 48 parts of a water-based epoxy curing agent, 40 parts of deionized water and 12 parts of propylene glycol methyl ether;

the waterborne epoxy primer for the interior decoration of the locomotive vehicle is prepared by the following steps:

pouring deionized water into a container cylinder according to a formula, placing the container cylinder under a dispersion machine for dispersion, adjusting the rotating speed to 700r/min, sequentially adding an anionic polymer dispersant, fumed silica, a nonionic surfactant, a polysiloxane antifoaming agent, a purification filler and an antirust pigment in a stirring state, adjusting the rotating speed of the dispersion machine to 1100r/min after the feeding is finished, and stirring for 25min to obtain pre-dispersion slurry;

pumping the pre-dispersed slurry into a sand mill by using a diaphragm pump, grinding the pre-dispersed slurry until the fineness is less than or equal to 20 mu m, discharging to obtain sand-milled slurry, diluting the water-based inorganic hybrid organic silicon acrylic resin by using propylene glycol methyl ether, adding the diluted water-based inorganic hybrid organic silicon acrylic resin, the water-based epoxy emulsion, a polyether siloxane wetting agent, an acrylate flatting agent and a polyurethane association type thickening agent into the sand-milled slurry, after the feeding is finished, adjusting the rotating speed of a dispersion machine to be 1100r/min, stirring for 12min, finally adding an anti-flash rust agent and a cosolvent, stirring for 12min, filtering by using a 120-mesh filter screen, and removing mechanical impurities to obtain a paint vehicle;

step three, preparation of a curing agent: adding a waterborne epoxy curing agent and deionized water in the formula into a container cylinder, adding propylene glycol methyl ether at 600r/min, and stirring at the rotating speed of 1100r/min for 8min to obtain a curing agent;

fourthly, mixing the paint and the curing agent according to the mass ratio of 6:1 stirring and mixing, and adjusting the construction viscosity by using deionized water to obtain the water-based epoxy primer for the interior decoration of the locomotive vehicle.

The specific process for diluting the water-based inorganic hybrid organic silicon acrylic resin comprises the following steps: and adding propylene glycol methyl ether into the water-based inorganic hybrid organic silicon acrylic resin to ensure that the mass fraction of the water-based inorganic hybrid organic silicon acrylic resin is 75%.

The cosolvent is ethylene glycol monobutyl ether, the rust-proof pigment is zinc phosphate, and the flash rust inhibitor is an organic carboxylate flash rust inhibitor.

Example 7

The embodiment provides a water-based epoxy primer for interior decoration of a rolling stock, which consists of paint and a curing agent;

the paint comprises the following raw materials in parts by weight: 45 parts of water-based epoxy emulsion, 8 parts of water-based inorganic hybrid organic silicon acrylic resin, 0.8 part of fumed silica, 2.5 parts of anionic polymer dispersant, 1.0 part of nonionic surfactant, 0.3 part of polysiloxane defoamer, 0.5 part of polyether siloxane wetting agent, 0.4 part of acrylate flatting agent, 20 parts of purification filler, 20 parts of antirust pigment, 0.5 part of polyurethane associated thickener, 1.5 parts of cosolvent, 1.0 part of flash rust inhibitor and 15 parts of deionized water.

The curing agent comprises the following raw materials in parts by weight: 50 parts of a water-based epoxy curing agent, 45 parts of deionized water and 15 parts of propylene glycol methyl ether;

the waterborne epoxy primer for the interior decoration of the locomotive vehicle is prepared by the following steps:

pouring deionized water into a container cylinder according to a formula, placing the container cylinder under a dispersion machine for dispersion, adjusting the rotating speed to 800r/min, sequentially adding an anionic polymer dispersant, fumed silica, a nonionic surfactant, a polysiloxane antifoaming agent, a purification filler and an antirust pigment under a stirring state, adjusting the rotating speed of the dispersion machine to 1200r/min after the feeding is finished, and stirring for 30min to obtain pre-dispersion slurry;

secondly, pumping the pre-dispersed slurry into a sand mill by using a diaphragm pump, grinding the pre-dispersed slurry until the fineness is less than or equal to 20 mu m, discharging the material to obtain sand-milled slurry, diluting the water-based inorganic hybrid organic silicon acrylic resin by using propylene glycol methyl ether, adding the diluted water-based inorganic hybrid organic silicon acrylic resin, the water-based epoxy emulsion, the polyether siloxane wetting agent, the acrylate flatting agent and the polyurethane associated thickener into the sand-milled slurry, after the feeding is finished, adjusting the rotating speed of a dispersion machine to 1200r/min, stirring for 15min, finally adding the anti-flash rust agent and the cosolvent, stirring for 15min, filtering by using a 120-mesh filter screen, and removing mechanical impurities to obtain a paint vehicle;

step three, preparation of a curing agent: adding a waterborne epoxy curing agent and deionized water in the formula into a container cylinder, adding propylene glycol methyl ether at 800r/min, and stirring at the rotating speed of 1200r/min for 10min to obtain a curing agent;

fourthly, mixing the paint and the curing agent according to the mass ratio of 6:1 stirring and mixing, and adjusting the construction viscosity by using deionized water to obtain the water-based epoxy primer for the interior decoration of the locomotive vehicle.

The specific process for diluting the water-based inorganic hybrid organic silicon acrylic resin comprises the following steps: and adding propylene glycol methyl ether into the water-based inorganic hybrid organic silicon acrylic resin to ensure that the mass fraction of the water-based inorganic hybrid organic silicon acrylic resin is 75%.

The cosolvent is propylene glycol methyl ether, the antirust pigment is aluminum tripolyphosphate, and the flash rust inhibitor is an organic carboxylate flash rust inhibitor.

Comparative example 4

The purification filler of example 5 was replaced with the material of comparative example 1, and the other raw materials and preparation process were the same as example 5.

Comparative example 5

The purification filler in example 6 was replaced by the material in comparative example 2, and the rest of the raw materials and the preparation process were the same as in example 6.

Comparative example 6

The purification packing of example 7 was replaced with the material of comparative example 3, and the remaining raw materials and preparation were the same as in example 7.

The waterborne epoxy primers prepared in examples 5-7 and comparative examples 4-6 were tested and the results are shown in Table 1:

TABLE 1

As can be seen from Table 1, the primers prepared in examples 5 to 7 have higher surface drying and solid drying speeds, higher mechanical properties, and excellent water resistance, solvent resistance and salt spray resistance compared with those of comparative examples 4 to 6.

The waterborne epoxy primers prepared in examples 5-7 and comparative examples 4-6 were tested and tested for harmful substances according to the standard GB18582-2008, and the test results are shown in Table 2:

TABLE 2

As can be seen from Table 2, the paints prepared in examples 5 to 7 have lower VOC and are more environmentally friendly than those prepared in comparative examples 4 to 6, and TiO in the examples ₂ The diatomite composite material can effectively decompose VOC under illumination, and ensures that the internal environment of the vehicle is healthy and friendly.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only of the present invention, and it is intended that the present invention cover modifications, additions, or substitutions by those skilled in the art, without departing from the spirit of the invention or exceeding the scope of the claims.

Claims (7)

1. The water-based epoxy primer for the interior decoration of the locomotive vehicle consists of paint and a curing agent, and is characterized in that the paint comprises the following raw materials in parts by weight: 35-45 parts of water-based epoxy emulsion, 6-8 parts of water-based inorganic hybrid organic silicon acrylic resin, 0.5-0.8 part of fumed silica, 2.0-2.5 parts of anionic polymer dispersant, 0.8-1.0 part of nonionic surfactant, 0.2-0.3 part of polysiloxane defoamer, 0.3-0.5 part of polyether siloxane wetting agent, 0.3-0.4 part of acrylate flatting agent, 15-20 parts of purifying filler, 15-20 parts of antirust pigment, 0.3-0.5 part of polyurethane associative thickener, 1.0-1.5 parts of cosolvent, 0.8-1.0 part of flash rust inhibitor and 10-15 parts of deionized water;

the curing agent comprises the following raw materials in parts by weight: 45-50 parts of a water-based epoxy curing agent, 35-45 parts of deionized water and 10-15 parts of propylene glycol methyl ether;

the purification filler is prepared by the following steps:

thiolated TiO ₂ The diatomite composite material, the mercapto-alkyne reaction monomer and the DMF are mixed and ultrasonically oscillated, benzoin dimethyl ether is added for ultrasonic oscillation, then radiation is carried out for 0.8 to 1 hour under a high-pressure mercury lamp, reduced pressure suction filtration is carried out, and a filter cake is washed and dried to obtain the purified filler.

2. The water based epoxy primer for interior decoration of rolling stock according to claim 1, wherein the mercapto TiO is ₂ The dosage ratio of the diatomite composite material, the mercapto-alkyne reaction monomer and the DMF is 2.5-2.8 g: 0.2-0.3 g: 30-40mL of benzoin dimethyl ether with the dosage of sulfhydrylation TiO ₂ The mass sum of the diatomite composite material and the mercapto-alkyne reaction monomer is 2-3%.

3. The water based epoxy primer for interior decoration of rolling stock according to claim 1, wherein the mercapto TiO is ₂ The diatomite composite material is prepared by the following steps:

adding absolute ethyl alcohol, distilled water and TiO ₂ Mixing the diatomite composite material, adding a coupling agent KH-590, adjusting the pH to 3-4 with a hydrochloric acid solution, carrying out ultrasonic treatment for 1h, stirring and reacting at 70 ℃ for 6-8h, carrying out suction filtration, washing a filter cake with a liquid, and drying to obtain sulfhydrylated TiO ₂ A diatomite composite material.

4. The water-based epoxy primer for interior decoration of rolling stock according to claim 3, wherein the primer is selected from the group consisting of absolute ethanol, distilled water, and TiO ₂ DiatomThe dosage ratio of the soil composite material to the coupling agent KH-590 is 50-60 mL: 20-30 mL: 4.7-5.1 g: 0.15-0.25 g.

5. The water based epoxy primer for interior decoration of rolling stock according to claim 3, wherein TiO is ₂ The diatomite composite material is prepared by the following steps:

dissolving titanyl sulfate in deionized water, stirring for 8h to form 0.4mol/L titanyl sulfate solution, adding diatomite, stirring, dropwise adding ammonia water solution until the pH value reaches 6 under the condition of ice-water bath, stirring, performing suction filtration, washing and drying a filter cake, and calcining in a muffle furnace at 600 ℃ for 2-3h to obtain TiO ₂ A diatomite composite material.

6. The water based epoxy primer for interior decoration of rolling stock according to claim 5, wherein the amount ratio of the diatomaceous earth to the titanyl sulfate solution is 1 g: 100 and 120 mL.

7. The method of preparing a water-based epoxy primer for interior decoration of a rolling stock according to claim 1, wherein the steps are as follows:

pouring deionized water into a container cylinder according to a formula, sequentially adding an anionic polymer dispersant, fumed silica, a non-ionic surfactant, a polysiloxane antifoaming agent, a purifying filler and an antirust pigment under a stirring state, and stirring after the materials are added to obtain pre-dispersed slurry;

pumping the pre-dispersed slurry into a sand mill by using a diaphragm pump, grinding the pre-dispersed slurry until the fineness is less than or equal to 20 mu m, discharging to obtain sand-milled slurry, diluting the water-based inorganic hybrid organic silicon acrylic resin by using propylene glycol methyl ether, adding the diluted water-based epoxy emulsion, a polyether siloxane wetting agent, an acrylate flatting agent and a polyurethane associative thickener into the sand-milled slurry, adding an anti-flash rust agent and a cosolvent after stirring, stirring and filtering to obtain a paint vehicle;

step three, preparation of a curing agent: adding a waterborne epoxy curing agent and deionized water in the formula into a container cylinder, adding propylene glycol monomethyl ether under stirring, and stirring uniformly to obtain a curing agent;

fourthly, mixing the paint and the curing agent according to the mass ratio of 6:1 stirring and mixing, and adjusting the construction viscosity by using deionized water to obtain the water-based epoxy primer for the interior decoration of the locomotive vehicle.

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