Water-based anticorrosive paint and application thereof in automobile corrosion prevention

Abstract

The invention relates to the technical field of water-based anticorrosive coatings, and discloses a water-based anticorrosive coating which comprises the following components: 50-60 parts of modified water-based polyurethane, 10-30 parts of acrylic polyurethane, 10-15 parts of a coalescing agent, 30-35 parts of a defoaming agent, 9-18 parts of a flatting agent, 11-20 parts of ferrotitanium powder and 7-16 parts of an ultraviolet light absorber, and further comprises application of the water-based anticorrosive coating in corrosion prevention of automobiles. Comprising the following steps that firstly, a to-be-sprayed steel plate is taken, oil stains on the surface of the steel plate are cleaned away through alcohol, after the steel plate is wiped dry through absorbent gauze, oxide on the surface is polished and removed through abrasive paper for use; by adding the ferrotitanium powder and the preservative, the coating is good in adhesive force, extremely high in shielding effect and excellent in corrosion resistance, damage to automobile parts caused by high temperature can be reduced through cooperation of the modified waterborne polyurethane and the acrylic polyurethane coating, and the problem that the automobile parts are prone to rusting is solved.

Description

Technical Field

[0001] The invention relates to the technical field of anti-corrosion coatings, in particular to a water-based anti-corrosion coating and application thereof in automobile anti-corrosion. Background Art

[0002] With the rapid development of the automobile industry, there are countless cars of various series and brands on the market. Therefore, users have more room to choose products, and the market competition is more intense. In today's era, when consumers choose automobile products, in addition to paying attention to brand and appearance as in the past, durability is also one of the main indispensable factors in automobile coatings.

[0003] At present, most automobile parts are made of metal materials, and metal materials generally have corrosion problems. When metal parts move in a corrosive gas or liquid environment, chemical corrosion or electrochemical corrosion occurs on the friction surface to generate a corrosion layer. Continued friction will cause it to peel off and cause parts damage. The corrosion of vehicle metal parts will not only reduce their quality and life, but also due to their abnormal corrosion, damaged parts are very likely to cause traffic accidents, and even cause the tragedy of vehicle destruction and death. Therefore, an automotive water-based anti-corrosion coating is proposed. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a water-based anti-corrosion coating and its application in automobile corrosion protection, which solves the common corrosion problem of existing metal automobile parts, which not only reduces their quality and lifespan, but also causes traffic accidents due to abnormal corrosion and damage to parts, and even causes tragedies such as vehicle destruction and loss of life.

[0006] (II) Technical solution

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A water-based anticorrosive coating comprises the following components: 50-60 parts of modified water-based polyurethane, 10-30 parts of acrylic polyurethane, 10-15 parts of film-forming aid, 30-35 parts of defoaming agent, 9-18 parts of leveling agent, 11-20 parts of iron-titanium powder, 7-16 parts of ultraviolet absorber, 11-23 parts of preservative and 13-19 parts of deionized water.

[0009] Further, the following steps are included:

[0010] S1: Initial mixing: deionized water, film-forming aid, modified waterborne polyurethane and acrylic polyurethane are placed in a container, heated to 35-55°C, and dispersed at 4500-6500r / min for 25-35min to obtain a preliminary film-forming material;

[0011] S2: reaction, adding the above-obtained raw materials into a reaction kettle, adding iron titanium powder, leveling agent, ultraviolet absorber and defoaming agent, adjusting the heating temperature to 180-190°C, the stirring speed to 600-700r / min, the reaction time to 4-8 minutes, and set aside;

[0012] S3: Anticorrosive treatment: adding the above raw materials to the preservative, ultrasonically stirring for 20-30 minutes, and stirring evenly to obtain a mixed slurry;

[0013] S4: Adjust viscosity and pH value: adjust the viscosity and pH value of the coating according to product requirements;

[0014] S5: Filtration and impurity removal: use filtering equipment to filter the stirred coating to remove solid particles, impurities and unreacted substances;

[0015] S6: Packaging: Packaging the produced water-based anti-corrosion coating.

[0016] On the basis of the above, the preparation method of the modified waterborne polyurethane in S1 is as follows: a certain amount of oligomer polyol is added to the reactor, vacuum dehydration is performed at 110°C for 1-2h, acetone is added to the oligomer polyol in an amount of 1.5 to 3.5 times the mass of the oligomer polyol, and polyisocyanate is added dropwise at 55 to 80°C in an amount of 0.5 to 2 times the mass of the oligomer polyol, and the reaction is performed for 1-2h; a small amount of catalyst is added to the reaction solution in the above step, and a hydrophilic chain extender with a mass fraction of 5% to 30% of the oligomer polyol and 0.1% to 6% of a small amount of A mixture of a sub-chain extender and 6%-33% of a modifier tung oil anhydride ester polyol is reacted for 3-5h; after cooling the reaction solution in the previous step to 40-55°C, 4%-36% of the mass fraction of the oligomer polyol is added as a salt-forming agent triethylamine, and the reaction is carried out for 20-45min; after the reaction solution is cooled to 30-45°C again, deionized water 2.5 times to 4.5 times the mass of the oligomer polyol is added under high-speed stirring, and the acetone is removed under reduced pressure after emulsification and dispersion for 25-45min to obtain a tung oil anhydride ester polyol modified waterborne polyurethane emulsion.

[0017] As a further scheme of the present invention, the film-forming aid in S1 is a composition of dimethyl sulfoxide and ethylene glycol, the defoaming agent in S2 is any one or both of GPE type polyoxyethylene polyoxypropylene glycerol ether or modified silicone defoaming agent, the leveling agent is one of fluorocarbon modified acrylate leveling agent, silicone leveling agent and acrylate leveling agent, the ultraviolet absorber is one of triazine ultraviolet absorber UV 400 and ultraviolet absorber 1130Tinuvin1130, and the automotive coating preservative in S3 is any one or both of chlorinated rubber heavy anticorrosive coating and chlorinated rubber anticorrosive paint.

[0018] Furthermore, in S4, the viscosity is adjusted by adding an appropriate amount of water, and the pH value is adjusted by using a pH adjuster, the pH adjuster includes an inorganic neutralizer and an organic amine, the inorganic neutralizer is selected from one of ammonia water, potassium hydroxide and sodium hydroxide, and the organic amine is 2-amino-2-methyl-1-propanol.

[0019] On the basis of the above, the filtering equipment in S5 includes a filter screen or a filter. Products that do not meet the fineness standards need to be re-dispersed or ground. The filtered paint liquid can be packaged according to the specifications. S6 usually uses sealed containers such as barrels or cans. The paint needs to be stored in a dry and cool place to avoid direct sunlight and extreme temperature changes.

[0020] As a further embodiment of the present invention, the present invention further comprises an application of a water-based anticorrosive coating in automobile anticorrosion, comprising the following steps:

[0021] First, take the steel plate to be sprayed, use alcohol to clean the oil on the surface of the steel plate, wipe it dry with degreased gauze, and then use sandpaper to polish and remove the oxide on the surface for later use;

[0022] Then use an air spray gun to spray a layer of primer on the steel surface with a wet film thickness of 45-280μm, then evenly disperse the self-repairing microcapsules on the primer, and spray a layer of topcoat after it is completely dried with a wet film thickness of 80-400μm.

[0023] Furthermore, the spraying pressure is 500-850 KPa, the angle of the spray gun is 25-95°, the spraying distance is 15-55 cm, and the moving speed of the spray gun is 15-38 cm / s.

[0024] (III) Beneficial effects

[0025] Compared with the prior art, the present invention provides a water-based anti-corrosion coating and its application in automobile anti-corrosion, which has the following beneficial effects:

[0026] 1. The modified waterborne polyurethane and acrylic polyurethane coatings of the present invention are matched to be resistant to high temperatures, thereby being able to adapt to the working conditions of the automobile exhaust system, effectively protecting the surface of the automobile frame and parts, reducing damage caused by high temperatures, and extending the service life of automobile parts. This coating meets environmental protection requirements, is friendly to human health and the environment, and is an effective solution to the problem of rust on automobile parts.

[0027] 2. The present invention adds ferrotitanium powder to make the coating have excellent weather resistance and environmental protection performance, can withstand the test of various adverse climatic conditions, is not easy to change color and fall off, and has good dispersibility. It is more uniform when mixed with other materials, avoiding the problems of color difference and particles in the coating. In addition, ferrotitanium powder can also enhance the hardness, density and corrosion resistance of the paint film, and the stability, anti-settling and anti-rust performance of the produced coating are significantly improved. With the use of preservatives, the coating has good adhesion, strong shielding effect and excellent anti-corrosion performance.

[0028] 3. The defoaming agent in the present invention is used to suppress the bubbles generated in the paint liquid during the production process, and make the generated bubbles escape from the liquid surface and break. The leveling agent improves the construction performance of the paint to form a flat and smooth coating. The ultraviolet absorber can improve the weather resistance of the coating, extend the service life, reduce color changes, maintain stable physical properties, and improve safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic diagram of the process mechanism of a method for preparing a water-based anti-corrosion coating. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example 1

[0032] Reference Figure 1 A water-based anti-corrosion coating comprises the following components: 50 parts of modified water-based polyurethane, 10 parts of acrylic polyurethane, 10 parts of film-forming aid, 30 parts of defoaming agent, 9 parts of leveling agent, 11 parts of iron-titanium powder, 7 parts of ultraviolet absorber, 11 parts of preservative, and 13 parts of deionized water.

[0033] The preparation method is:

[0034] S1: Initial mixing: deionized water, film-forming aid, modified waterborne polyurethane and acrylic polyurethane are placed in a container, heated to 35°C, and dispersed at 4500r / min for 25min to obtain a preliminary film-forming material;

[0035] S2: reaction, adding the above-obtained raw materials into a reaction kettle, adding iron titanium powder, leveling agent, ultraviolet absorber and defoaming agent, adjusting the heating temperature to 180-190°C, the stirring speed to 600r / min, the reaction time to 4 minutes, and set aside;

[0036] S3: Antiseptic treatment: adding the above raw materials to the preservative, ultrasonically stirring for 20 minutes, and stirring evenly to obtain a mixed slurry;

[0037] S4: Adjust viscosity and pH value: adjust the viscosity and pH value of the coating according to product requirements;

[0038] S5: Filtration and impurity removal: use filtering equipment to filter the stirred coating to remove solid particles, impurities and unreacted substances;

[0039] S6: Packaging: Packaging the produced water-based anti-corrosion coating.

[0040] It should be noted that the preparation method of the modified waterborne polyurethane in S1 is as follows: a certain amount of oligomer polyol is added to the reactor, vacuum dehydration is performed at 110°C for 1h, acetone in an amount of 1.5 times the mass of the oligomer polyol is added to the oligomer polyol, and a polyisocyanate in an amount of 0.5 times the mass of the oligomer polyol is added dropwise at 60°C, and the reaction is performed for 1h; a small amount of catalyst is added to the reaction solution in the previous step, and a mixture of a hydrophilic chain extender with a mass fraction of 5% of the oligomer polyol, a small molecule chain extender with a mass fraction of 0.1% and a modifier tung oil anhydride polyol with a mass fraction of 6% is added dropwise, and the reaction is performed for 3; after the reaction solution in the previous step is cooled to 40°C, a salt-forming agent triethylamine with a mass fraction of 5% of the oligomer polyol is added, and the reaction is performed for 20min; after the reaction solution is cooled to 30°C again, deionized water with a mass fraction of 2.5 times the mass of the oligomer polyol is added under high-speed stirring, and the acetone is removed under reduced pressure after emulsification and dispersion for 30min to obtain a waterborne polyurethane emulsion modified with tung oil anhydride polyol.

[0041] In particular, the film-forming aid in S1 is a composition of dimethyl sulfoxide and ethylene glycol, the defoamer in S2 is a modified silicone defoamer, the leveling agent is one of a fluorocarbon modified acrylate leveling agent, a silicone leveling agent and an acrylate leveling agent, and the ultraviolet absorber is a triazine ultraviolet absorber UV 400 and one of the ultraviolet absorbers Tinuvin 1130. In S3, the automotive paint preservative is any one or two of chlorinated rubber heavy anti-corrosion paint and chlorinated rubber anti-corrosion paint. In S4, the viscosity is adjusted by adding an appropriate amount of water. The pH value is adjusted using a pH adjuster. The pH adjuster includes an inorganic neutralizer and an organic amine. The inorganic neutralizer is selected from ammonia water, potassium hydroxide and sodium hydroxide. The organic amine is 2-amino-2-methyl-1-propanol. In S5, the filtration equipment includes a filter screen or a filter. Products that do not meet the fineness standards need to be re-dispersed or ground. The filtered paint liquid can be packaged according to specifications. In S6, sealed containers such as barrels or cans are usually used. The paint needs to be stored in a dry and cool place to avoid direct sunlight and extreme temperature changes.

[0042] The invention discloses an application of a water-based anticorrosive coating in automobile anticorrosion, comprising the following steps: firstly, taking a steel plate to be sprayed, washing the oil stains on the surface of the steel plate with alcohol, wiping it with degreased gauze, and then polishing and removing the oxides on the surface with sandpaper for standby use; then, spraying a layer of primer on the surface of the steel with an air spray gun, with a wet film thickness of 45 μm, and then evenly dispersing self-repairing microcapsules on the primer, spraying a layer of topcoat after it is completely dried, with a wet film thickness of 80 μm, a spraying pressure of 500 KPa, a spray gun angle of 25°, a spraying distance of 15 cm, and a moving speed of the spray gun of 15 cm / s.

[0043] Example 2

[0044] Reference Figure 1 A water-based anti-corrosion coating comprises the following components: 60 parts of modified water-based polyurethane, 30 parts of acrylic polyurethane, 15 parts of film-forming aid, 35 parts of defoaming agent, 18 parts of leveling agent, 20 parts of iron-titanium powder, 16 parts of ultraviolet absorber, 23 parts of preservative, and 19 parts of deionized water.

[0045] The preparation method comprises the following steps:

[0046] S1: Initial mixing: deionized water, film-forming aid, modified waterborne polyurethane and acrylic polyurethane are placed in a container, heated to 55°C, and dispersed at 6500r / min for 35min to obtain a preliminary film-forming material. The film-forming aid is a combination of dimethyl sulfoxide and ethylene glycol;

[0047] S2: reaction, adding the raw materials obtained above into the reaction kettle, adding iron titanium powder, leveling agent, ultraviolet absorber and defoamer, adjusting the heating temperature to 190°C, the stirring speed to 700r / min, the reaction time to 8 minutes, and setting aside, the defoamer is GPE type polyoxyethylene polyoxypropylene glycerol ether, the leveling agent is fluorocarbon modified acrylate leveling agent, and the ultraviolet absorber is triazine ultraviolet absorber UV 400;

[0048] S3: Anti-corrosion treatment, adding the above raw materials to the preservative, ultrasonic stirring for 30 minutes, stirring evenly to obtain a mixed slurry, the preservative is chlorinated rubber heavy anti-corrosion coating;

[0049] S4: Adjust viscosity and pH value: According to the requirements of the product, adjust the viscosity and pH value of the coating. Adjust the viscosity by adding an appropriate amount of water, and adjust the pH value by using a pH adjuster. The pH adjuster includes an inorganic neutralizer and an organic amine. The inorganic neutralizer is ammonia water, and the organic amine is 2-amino-2-methyl-1-propanol.

[0050] S5: Filtration and impurity removal. Use filtering equipment to filter the stirred paint to remove solid particles, impurities and unreacted substances. The filtering equipment includes a filter screen or a filter. Products that do not meet the fineness standards need to be re-dispersed or ground. The filtered paint liquid can be packaged according to the specifications;

[0051] S6: Packaging: Pack the produced water-based anti-corrosion coating in sealed containers such as barrels or cans. The coating needs to be stored in a dry, cool place, avoiding direct sunlight and extreme temperature changes.

[0052] It should be noted that the preparation method of the modified waterborne polyurethane in S1 is as follows: a certain amount of oligomer polyol is added to the reactor, vacuum dehydration is performed at 110°C for 2h, acetone is added to the oligomer polyol in an amount of 3.5 times the mass of the oligomer polyol, and polyisocyanate is added dropwise at 80°C in an amount of 1.5 times the mass of the oligomer polyol, and the reaction is carried out for 2h; a small amount of catalyst is added to the reaction solution in the previous step, and a mixture of a hydrophilic chain extender with a mass fraction of 30% of the oligomer polyol, a small molecule chain extender with a mass fraction of 6%, and a modifier tung oil anhydride ester polyol with a mass fraction of 30% is added dropwise, and the reaction is carried out for 5h; after cooling the reaction solution in the previous step to 50°C, a salt-forming agent triethylamine with a mass fraction of 30% of the oligomer polyol is added, and the reaction is carried out for 40min; after the reaction solution is cooled to 40°C again, deionized water with a mass fraction of 4.5 times the mass of the oligomer polyol is added under high-speed stirring, and the acetone is removed under reduced pressure after emulsification and dispersion for 40min to obtain a waterborne polyurethane emulsion modified with tung oil anhydride ester polyol.

[0053] The invention discloses an application of a water-based anticorrosive coating in automobile anticorrosion, comprising the following steps: firstly, taking a steel plate to be sprayed, washing the oil stains on the surface of the steel plate with alcohol, wiping it with degreased gauze, and then polishing and removing the oxides on the surface with sandpaper for standby use; then, spraying a layer of primer on the surface of the steel with an air spray gun, with a wet film thickness of 280 μm, then evenly dispersing self-repairing microcapsules on the primer, spraying a layer of topcoat after it is completely dried, with a wet film thickness of 400 μm, a spraying pressure of 850 KPa, a spray gun angle of 25-95°, a spraying distance of 55 cm, and a moving speed of the spray gun of 38 cm / s.

[0054] The present invention also includes a controller, a voice receiver and an operating device. The voice receiver is electrically connected to the controller, and the controller is electrically connected to the operating device. The voice receiver receives external operating voice information and sends an operating signal of the operating voice information to the controller. The controller controls the operating device to execute the operating signal.

[0055] In the description of this article, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-based anticorrosive coating, characterized in that: The invention comprises the following components: 50-60 parts of modified waterborne polyurethane, 10-30 parts of acrylic polyurethane, 10-15 parts of film-forming aid, 30-35 parts of defoaming agent, 9-18 parts of leveling agent, 11-20 parts of iron-titanium powder, 7-16 parts of ultraviolet absorber, 11-23 parts of preservative and 13-19 parts of deionized water.

2. A water-based anti-corrosion coating according to claim 1, characterized in that: The following steps are involved: S1: Initial mixing: deionized water, film-forming aid, modified waterborne polyurethane and acrylic polyurethane are placed in a container, heated to 35-55°C, and dispersed at 4500-6500r / min for 25-35min to obtain a preliminary film-forming material; S2: reaction, adding the above-obtained raw materials into a reaction kettle, adding iron titanium powder, leveling agent, ultraviolet absorber and defoaming agent, adjusting the heating temperature to 180-190°C, the stirring speed to 600-700r / min, the reaction time to 4-8 minutes, and set aside; S3: Anticorrosive treatment: adding the above raw materials to the preservative, ultrasonically stirring for 20-30 minutes, and stirring evenly to obtain a mixed slurry; S4: Adjust viscosity and pH value: adjust the viscosity and pH value of the coating according to product requirements; S5: Filtration and impurity removal: use filtering equipment to filter the stirred coating to remove solid particles, impurities and unreacted substances; S6: Packaging: Packaging the produced water-based anti-corrosion coating.

3. A water-based anti-corrosion coating according to claim 2, characterized in that: The preparation method of the modified waterborne polyurethane in S1 is as follows: a certain amount of oligomer polyol is added to the reactor, vacuum dehydration is performed at 110° C. for 1-2 hours, acetone is added to the oligomer polyol in an amount of 1.5 to 3.5 times the mass of the oligomer polyol, polyisocyanate is added dropwise at 55 to 80° C. in an amount of 0.5 to 2 times the mass of the oligomer polyol, and the reaction is performed for 1-2 hours; a small amount of catalyst is added to the reaction solution in the above step, a hydrophilic chain extender with a mass fraction of 5% to 30% of the oligomer polyol and a small molecule chain extender with a mass fraction of 0.1% to 6% are added dropwise. and a mixture of 6%-33% of a modifier tung oil anhydride ester polyol, reacting for 3-5h; cooling the reaction solution in the previous step to 40-55°C, adding triethylamine, a salt-forming agent, with a mass fraction of 4%-36% of the oligomer polyol, and reacting for 20-45min; cooling the reaction solution to 30-45°C again, adding deionized water with a mass fraction of 2.5-4.5 times that of the oligomer polyol under high-speed stirring, emulsifying and dispersing for 25-45min, and then removing acetone under reduced pressure to obtain a tung oil anhydride ester polyol modified waterborne polyurethane emulsion.

4. A water-based anti-corrosion coating according to claim 1, characterized in that: The film-forming aid in S1 is a composition of dimethyl sulfoxide and ethylene glycol, the defoaming agent in S2 is any one or both of GPE type polyoxyethylene polyoxypropylene glycerol ether or modified silicone defoaming agent, the leveling agent is one of fluorocarbon modified acrylate leveling agent, silicone leveling agent and acrylate leveling agent, the ultraviolet absorber is one of triazine ultraviolet absorber UV 400 and ultraviolet absorber 1130 Tinuvin 1130, and the automotive coating preservative in S3 is any one or both of chlorinated rubber heavy anticorrosive coating and chlorinated rubber anticorrosive paint.

5. The water-based anti-corrosion coating according to claim 1, characterized in that: In the S4, the viscosity is adjusted by adding an appropriate amount of water, and the pH value is adjusted by using a pH adjuster, the pH adjuster includes an inorganic neutralizer and an organic amine, the inorganic neutralizer is selected from one of ammonia water, potassium hydroxide and sodium hydroxide, and the organic amine is 2-amino-2-methyl-1-propanol.

6. A water-based anti-corrosion coating according to claim 5, characterized in that: The filtering equipment in S5 includes a filter screen or a filter. Products that do not meet the fineness standards need to be re-dispersed or ground. The filtered paint liquid can be packaged according to the specifications. In S6, sealed containers such as barrels or cans are usually used. The paint needs to be stored in a dry and cool place to avoid direct sunlight and extreme temperature changes.

7. The use of a water-based anti-corrosion coating in automobile anti-corrosion according to claim 1, characterized in that: The following steps are involved: First, take the steel plate to be sprayed, use alcohol to clean the oil on the surface of the steel plate, wipe it dry with degreased gauze, and then use sandpaper to polish and remove the oxide on the surface for later use; Then use an air spray gun to spray a layer of primer on the steel surface with a wet film thickness of 45-280μm, then evenly disperse the self-repairing microcapsules on the primer, and spray a layer of topcoat after it is completely dried with a wet film thickness of 80-400μm.

8. The use of a water-based anti-corrosion coating in automobile anti-corrosion according to claim 7, characterized in that: The spraying pressure is 500-850 KPa, the angle of the spray gun is 25-95°, the spraying distance is 15-55 cm, and the moving speed of the spray gun is 15-38 cm / s.

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