CN113429872A - Locking rod spraying process - Google Patents
Locking rod spraying process Download PDFInfo
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- CN113429872A CN113429872A CN202110777134.4A CN202110777134A CN113429872A CN 113429872 A CN113429872 A CN 113429872A CN 202110777134 A CN202110777134 A CN 202110777134A CN 113429872 A CN113429872 A CN 113429872A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/106—Anti-corrosive paints containing metal dust containing Zn
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2503/00—Polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
- B05D2601/22—Silica
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2601/00—Inorganic fillers
- B05D2601/20—Inorganic fillers used for non-pigmentation effect
- B05D2601/28—Metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0893—Zinc
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Abstract
The invention discloses a coating of a lock rod and a spraying process, wherein the coating is composed of the following raw materials in parts by weight: 100-120 parts of environment-friendly resin, 20-50 parts of filler, 8-12 parts of dispersant, 10-15 parts of curing agent and 40-50 parts of water; the filler comprises zinc powder, aluminum powder, silicon dioxide and graphene; the weight ratio of the zinc powder, the aluminum powder, the silicon dioxide and the graphene is 1: 1: 0.5-1: 0.2-0.5. The environment-friendly resin is metal anti-corrosion silane modified waterborne polyurethane resin, the silane coupling agent reacts with the metal surface to form a covalent bond, high adhesion is provided, meanwhile, the degree of crosslinking of a polyurethane coating film is improved by the hydrolytic crosslinking of a silicon-oxygen bond in the film forming process, the water resistance of the environment-friendly resin is far higher than that of a silane coupling agent-alone silanized film, and the anti-corrosion performance is greatly improved. The coating prepared by the invention has the advantages that the adhesive force of the material is comprehensively improved, so that the coated lock rod is resistant to neutral salt fog and acid salt fog, the corrosion resistance is excellent, and the environment protection is facilitated.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a coating of a lock rod and a spraying process.
Background
The lock rod is a hardware component for door lock, for example, a door for loading and unloading goods on a transport container, and four lock rods are generally installed on a door plate and locked by fasteners. The container is widely used as a main carrier of international freight, the safety of the container door lock is a 'life line' of container transportation, and the application environment of the container is often corrosive, so the surface of a steel container is usually required to be coated to have corrosion resistance, and the door lock also has high-efficiency corrosion resistance.
In nature, most of other metals and alloys thereof except a small amount of precious inert metals (gold, platinum and the like) are easy to corrode under natural conditions, and generally are subjected to protection treatment before use to improve the corrosion resistance and prolong the service life, wherein the metal surface coating technology based on organic coating is most applied and has the best effect. The coating system of the metal surface comprises a metal surface pretreatment layer and a subsequent protective layer. The traditional pretreatment technologies such as chromate passivation, phosphate conversion and the like are not friendly to the environment, for example, hexavalent chromium ions have strong toxicity, and phosphate can cause eutrophication of water bodies. With the rising of environmental protection call, the development of novel environment-friendly surface treatment process is urgently needed.
Aiming at the problem of environmental pollution, the Chinese patent with the prior art application number of 201110446471.1 discloses a method for individually protecting the surface of a metal piece by adopting a silane agent, wherein a metal workpiece is degreased firstly, then is washed twice, then is polished and derusted, then is washed again, then is washed by alkali liquor, and then is washed again, the washed metal workpiece is soaked in a silanization treating agent, then is cured, is soaked in an acrylic resin solution after being cured, and is taken out and dried after a few minutes. However, the polishing and rust removing method is not suitable for all metal workpieces, and is difficult to polish for some metal workpieces (such as lock rods) with corners and cylinders, and because some dead corners cannot be polished, the oxide film on the surface is not completely cleaned, the subsequent silane treatment effect and the coating effect are affected, the service life of coating is reduced, and in addition, the existing silane treatment agent also has the defects of poor corrosion resistance, non-uniform film forming, poor adhesion and the like, and the coating effect is also affected.
Therefore, the present invention provides an environment-friendly corrosion-resistant lock rod coating combination and a spraying process to solve the above problems.
Disclosure of Invention
The invention aims to provide a coating and a spraying process of a lock rod aiming at the defects in the prior art, and the coating is environment-friendly and has excellent corrosion resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the coating of the lock rod is composed of the following raw materials in parts by weight: 100-120 parts of environment-friendly resin, 20-50 parts of filler, 8-12 parts of dispersant, 10-15 parts of curing agent and 40-50 parts of water; the filler comprises zinc powder, aluminum powder, silicon dioxide and graphene; the weight ratio of the zinc powder, the aluminum powder, the silicon dioxide and the graphene is 1: 1: 0.5-1: 0.2-0.5.
Preferably, the preparation of the environment-friendly resin comprises the following steps:
(1) mixing polyether diol, polyisocyanate, a hydrophilic chain extender and a proper amount of solvent at room temperature, slowly heating to 80-90 ℃, reacting for 1.5-2h, adding a cross-linking agent, continuously reacting for 3-4h at 80-90 ℃, cooling to 50-60 ℃ after the reaction is finished, adding triethylamine, a catalyst and the solvent, and neutralizing for 20-30min to obtain a waterborne polyurethane prepolymer;
(2) and cooling the prepared waterborne polyurethane prepolymer to 22-28 ℃ by using ice water, strongly stirring at 1500-2000 r/min, adding water for high-speed dispersion, adding a silane coupling agent, blocking the prepolymer, dispersing at high speed for 30min, standing for defoaming, and thus obtaining the environment-friendly metal anticorrosive silane modified waterborne polyurethane resin.
Preferably, the catalyst is butyltin dilaurate, the solvent is a ketone solvent, the crosslinking agent is trimethylolpropane, and the hydrophilic chain extender is dimethylolpropionic acid.
Preferably, the weight ratio of the catalyst, the hydrophilic chain extender, the cross-linking agent, the triethylamine and the solvent is 0.5-0.6: 4-5: 0.8-1: 1-1.5: 50-52.
The invention also provides a preparation method of the coating of the lock rod, which comprises the following steps:
(1) weighing the raw materials according to the parts by weight;
(2) adding the filler, water and the curing agent into a high-speed stirrer and uniformly stirring;
(3) and adding the environment-friendly resin into a stirrer, adding a dispersing agent, and continuously stirring until the dispersing agent is uniformly dispersed to obtain the coating of the lock rod.
The invention also provides a spraying process of the coating of the lock rod, which comprises the following steps:
s1, removing the skinned and bulged old paint skin or thick rust layer on the surface of the lock rod, polishing and rinsing with water;
s2, firstly, spraying a coating on the rust layer, the periphery of the firm old paint layer and the welding seam of the lock rod for primary treatment to ensure that the rust layer, the periphery of the firm old paint layer and the welding seam are fully permeated and converted, and then, coating the surface of the lock rod together with the primary treated part on the whole surface by using the coating to form a first protective film;
and S3, when the surface of the first protective film is dry, brushing a second protective film, and drying at 40-45 ℃ for 20-24h to finish the surface anticorrosion treatment of the lock rod.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a polyurethane modified silanization metal anticorrosion technology, wherein a silane coupling agent reacts with a metal surface to form a covalent bond to provide high adhesion, meanwhile, the hydrolytic crosslinking of a silicon oxygen bond in a film forming process improves the crosslinking degree of a polyurethane coating, and the water resistance of the polyurethane coating is far higher than that of a silane coupling agent single silanization film, so that the anticorrosion performance is greatly improved.
2. Compared with phosphating treatment, the polyurethane modified silanized metal corrosion prevention technology has the advantages of environmental protection and no pollution.
3. The coating prepared by the invention has the advantages that the adhesive force of the material is comprehensively improved, so that the coated lock rod is resistant to neutral salt fog and acid salt fog, and the corrosion resistance is excellent.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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.
The test methods or test methods described in the following examples are conventional methods unless otherwise specified; the reagents and materials, unless otherwise indicated, are conventionally obtained commercially or prepared by conventional methods.
Example 1
The embodiment provides a coating of a lock rod, which comprises the following raw materials in parts by weight: 100-120 parts of environment-friendly resin, 20-50 parts of filler, 8-12 parts of dispersant, 10-15 parts of curing agent and 40-50 parts of water; the filler comprises zinc powder, aluminum powder, silicon dioxide and graphene; the weight ratio of the zinc powder, the aluminum powder, the silicon dioxide and the graphene is 1: 1: 0.5-1: 0.2-0.5; the coating composition is prepared according to the following steps:
(1) weighing the raw materials according to the parts by weight;
(2) adding the filler, water and the curing agent into a high-speed stirrer and uniformly stirring;
(3) and adding the environment-friendly resin into a stirrer, adding a dispersing agent, and continuously stirring until the dispersing agent is uniformly dispersed to obtain the coating of the lock rod.
Wherein, the preparation of the environment-friendly resin comprises the following steps:
(1) mixing polyether diol, polyisocyanate, a hydrophilic chain extender and a proper amount of solvent at room temperature, slowly heating to 80-90 ℃, reacting for 1.5-2h, adding a cross-linking agent, continuously reacting for 3-4h at 80-90 ℃, cooling to 50-60 ℃ after the reaction is finished, adding triethylamine, a catalyst and the solvent, and neutralizing for 20-30min to obtain a waterborne polyurethane prepolymer;
(2) and cooling the prepared waterborne polyurethane prepolymer to 22-28 ℃ by using ice water, strongly stirring at 1500-2000 r/min, adding water for high-speed dispersion, adding a silane coupling agent, blocking the prepolymer, dispersing at high speed for 30min, standing for defoaming, and thus obtaining the environment-friendly metal anticorrosive silane modified waterborne polyurethane resin.
The catalyst is butyltin dilaurate, the solvent is a ketone solvent, the crosslinking agent is trimethylolpropane, and the hydrophilic chain extender is dimethylolpropionic acid.
The weight ratio of the catalyst, the hydrophilic chain extender, the cross-linking agent, the triethylamine and the solvent is 0.5-0.6: 4-5: 0.8-1: 1-1.5: 50-52.
The prepared coating coats the lock rod according to the following steps:
s1, removing the skinned and bulged old paint skin or thick rust layer on the surface of the lock rod, polishing and rinsing with water;
s2, firstly, spraying a coating on the rust layer, the periphery of the firm old paint layer and the welding seam of the lock rod for primary treatment to ensure that the rust layer, the periphery of the firm old paint layer and the welding seam are fully permeated and converted, and then, coating the surface of the lock rod together with the primary treated part on the whole surface by using the coating to form a first protective film;
and S3, when the surface of the first protective film is dry, brushing a second protective film, and drying at 40-45 ℃ for 20-24h to finish the surface anticorrosion treatment of the lock rod.
Example 2
The embodiment provides a coating of a lock rod, which comprises the following raw materials in parts by weight: 100 parts of environment-friendly resin, 20 parts of filler, 8 parts of dispersant, 10 parts of curing agent and 40 parts of water; the filler comprises zinc powder, aluminum powder, silicon dioxide and graphene; the weight ratio of the zinc powder, the aluminum powder, the silicon dioxide and the graphene is 1: 1: 0.5: 0.2; the coating composition is prepared according to the following steps:
(1) weighing the raw materials according to the parts by weight;
(2) adding the filler, water and the curing agent into a high-speed stirrer and uniformly stirring;
(3) and adding the environment-friendly resin into a stirrer, adding a dispersing agent, and continuously stirring until the dispersing agent is uniformly dispersed to obtain the coating of the lock rod.
Wherein, the preparation of the environment-friendly resin comprises the following steps:
(1) mixing polyether diol, polyisocyanate, a hydrophilic chain extender and a proper amount of solvent at room temperature, slowly heating to 80 ℃, reacting for 1.5 hours, adding a cross-linking agent, continuously reacting for 3 hours at 80 ℃, cooling to 50 ℃ after the reaction is finished, adding triethylamine, a catalyst and the solvent, and neutralizing for 20 minutes to obtain a waterborne polyurethane prepolymer;
(2) and (2) cooling the prepared waterborne polyurethane prepolymer to 22 ℃ by using ice water, strongly stirring at 1500r/min, adding water for high-speed dispersion, adding a silane coupling agent, sealing the prepolymer, dispersing at high speed for 30min, standing for defoaming, and thus obtaining the environment-friendly metal anticorrosive silane modified waterborne polyurethane resin.
The catalyst is butyltin dilaurate, the solvent is a ketone solvent, the crosslinking agent is trimethylolpropane, and the hydrophilic chain extender is dimethylolpropionic acid.
The weight ratio of the catalyst, the hydrophilic chain extender, the cross-linking agent, the triethylamine and the solvent is 0.5: 4: 0.8: 1: 50.
the prepared coating coats the lock rod according to the following steps:
s1, removing the skinned and bulged old paint skin or thick rust layer on the surface of the lock rod, polishing and rinsing with water;
s2, firstly, spraying a coating on the rust layer, the periphery of the firm old paint layer and the welding seam of the lock rod for primary treatment to ensure that the rust layer, the periphery of the firm old paint layer and the welding seam are fully permeated and converted, and then, coating the surface of the lock rod together with the primary treated part on the whole surface by using the coating to form a first protective film;
and S3, when the surface of the first protective film is dry, brushing a second protective film, and drying at 40 ℃ for 20 hours to finish the surface anticorrosion treatment of the lock rod.
Example 3
The embodiment provides a coating of a lock rod, which comprises the following raw materials in parts by weight: 120 parts of environment-friendly resin, 50 parts of filler, 12 parts of dispersant, 15 parts of curing agent and 50 parts of water; the filler comprises zinc powder, aluminum powder, silicon dioxide and graphene; the weight ratio of the zinc powder, the aluminum powder, the silicon dioxide and the graphene is 1: 1: 1: 0.5; the coating composition is prepared according to the following steps:
(1) weighing the raw materials according to the parts by weight;
(2) adding the filler, water and the curing agent into a high-speed stirrer and uniformly stirring;
(3) and adding the environment-friendly resin into a stirrer, adding a dispersing agent, and continuously stirring until the dispersing agent is uniformly dispersed to obtain the coating of the lock rod.
Wherein, the preparation of the environment-friendly resin comprises the following steps:
(1) mixing polyether diol, polyisocyanate, a hydrophilic chain extender and a proper amount of solvent at room temperature, slowly heating to 90 ℃, reacting for 2 hours, adding a cross-linking agent, continuously reacting for 4 hours at 90 ℃, cooling to 60 ℃ after the reaction is finished, adding triethylamine, a catalyst and the solvent, and neutralizing for 30 minutes to obtain a waterborne polyurethane prepolymer;
(2) and cooling the prepared waterborne polyurethane prepolymer to 28 ℃ by using ice water, strongly stirring at 2000r/min, adding water for high-speed dispersion, adding a silane coupling agent, sealing the prepolymer, dispersing at high speed for 30min, standing and defoaming to obtain the environment-friendly metal anticorrosive silane modified waterborne polyurethane resin.
The catalyst is butyltin dilaurate, the solvent is a ketone solvent, the crosslinking agent is trimethylolpropane, and the hydrophilic chain extender is dimethylolpropionic acid.
The weight ratio of the catalyst, the hydrophilic chain extender, the cross-linking agent, the triethylamine and the solvent is 0.6: 5: 1: 1.5: 52.
the prepared coating coats the lock rod according to the following steps:
s1, removing the skinned and bulged old paint skin or thick rust layer on the surface of the lock rod, polishing and rinsing with water;
s2, firstly, spraying a coating on the rust layer, the periphery of the firm old paint layer and the welding seam of the lock rod for primary treatment to ensure that the rust layer, the periphery of the firm old paint layer and the welding seam are fully permeated and converted, and then, coating the surface of the lock rod together with the primary treated part on the whole surface by using the coating to form a first protective film;
and S3, when the surface of the first protective film is dry, brushing a second protective film, and drying at 45 ℃ for 24 hours to finish the surface anticorrosion treatment of the lock rod.
Example 4
The embodiment provides a coating of a lock rod, which comprises the following raw materials in parts by weight: 110 parts of environment-friendly resin, 35 parts of filler, 10 parts of dispersant, 12 parts of curing agent and 45 parts of water; the filler comprises zinc powder, aluminum powder, silicon dioxide and graphene; the weight ratio of the zinc powder, the aluminum powder, the silicon dioxide and the graphene is 1: 1: 0.8: 0.4; the coating composition is prepared according to the following steps:
(1) weighing the raw materials according to the parts by weight;
(2) adding the filler, water and the curing agent into a high-speed stirrer and uniformly stirring;
(3) and adding the environment-friendly resin into a stirrer, adding a dispersing agent, and continuously stirring until the dispersing agent is uniformly dispersed to obtain the coating of the lock rod.
Wherein, the preparation of the environment-friendly resin comprises the following steps:
(1) mixing polyether diol, polyisocyanate, a hydrophilic chain extender and a proper amount of solvent at room temperature, slowly heating to 85 ℃, reacting for 1.8 hours, adding a cross-linking agent, continuously reacting for 3.5 hours at 85 ℃, cooling to 55 ℃ after the reaction is finished, adding triethylamine, a catalyst and the solvent, and neutralizing for 25 minutes to obtain a waterborne polyurethane prepolymer;
(2) and cooling the prepared waterborne polyurethane prepolymer to 25 ℃ by using ice water, strongly stirring at 1800r/min, adding water for high-speed dispersion, adding a silane coupling agent, sealing the prepolymer, dispersing at high speed for 30min, standing and defoaming to obtain the environment-friendly metal anti-corrosion silane modified waterborne polyurethane resin.
The catalyst is butyltin dilaurate, the solvent is a ketone solvent, the crosslinking agent is trimethylolpropane, and the hydrophilic chain extender is dimethylolpropionic acid.
The weight ratio of the catalyst, the hydrophilic chain extender, the cross-linking agent, the triethylamine and the solvent is 0.5: 4: 1: 1.5: 52.
the prepared coating coats the lock rod according to the following steps:
s1, removing the skinned and bulged old paint skin or thick rust layer on the surface of the lock rod, polishing and rinsing with water;
s2, firstly, spraying a coating on the rust layer, the periphery of the firm old paint layer and the welding seam of the lock rod for primary treatment to ensure that the rust layer, the periphery of the firm old paint layer and the welding seam are fully permeated and converted, and then, coating the surface of the lock rod together with the primary treated part on the whole surface by using the coating to form a first protective film;
and S3, when the surface of the first protective film is dry, brushing a second protective film, and drying for 22 hours at the temperature of 45 ℃ to finish the surface anticorrosion treatment of the lock rod.
The coated locking bars of examples 2-4 were sampled for continuous neutral salt spray testing:
the samples were continuously exposed to 5% strength salt spray at 35 ℃ and soaked continuously for 500 hours without any change in the coating, according to the astm b117 standard.
The acid salt spray test was performed on the coated lock rods of examples 2-4:
in conclusion, the coating prepared by the invention is coated on the lock rod, is resistant to neutral salt fog and acid salt fog, has excellent corrosion resistance and is beneficial to environmental protection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The coating of the lock rod is characterized by comprising the following raw materials in parts by weight: 100-120 parts of environment-friendly resin, 20-50 parts of filler, 8-12 parts of dispersant, 10-15 parts of curing agent and 40-50 parts of water; the filler comprises zinc powder, aluminum powder, silicon dioxide and graphene; the weight ratio of the zinc powder, the aluminum powder, the silicon dioxide and the graphene is 1: 1: 0.5-1: 0.2-0.5.
2. The coating of the locking bar according to claim 1, wherein the preparation of the eco-friendly resin comprises the steps of:
(1) mixing polyether diol, polyisocyanate, a hydrophilic chain extender and a proper amount of solvent at room temperature, slowly heating to 80-90 ℃, reacting for 1.5-2h, adding a cross-linking agent, continuously reacting for 3-4h at 80-90 ℃, cooling to 50-60 ℃ after the reaction is finished, adding triethylamine, a catalyst and the solvent, and neutralizing for 20-30min to obtain a waterborne polyurethane prepolymer;
(2) and cooling the prepared waterborne polyurethane prepolymer to 22-28 ℃ by using ice water, strongly stirring at 1500-2000 r/min, adding water for high-speed dispersion, adding a silane coupling agent, blocking the prepolymer, dispersing at high speed for 30min, standing for defoaming, and thus obtaining the environment-friendly metal anticorrosive silane modified waterborne polyurethane resin.
3. The coating for a locking bar according to claim 2, wherein the catalyst is butyltin dilaurate, the solvent is a ketone solvent, the cross-linking agent is trimethylolpropane, and the hydrophilic chain extender is dimethylolpropionic acid.
4. The coating layer of the locking bar according to claim 3, wherein the weight ratio of the catalyst, the hydrophilic chain extender, the cross-linking agent, the triethylamine, and the solvent is 0.5-0.6: 4-5: 0.8-1: 1-1.5: 50-52.
5. A method for preparing a coating layer of a lock bar according to any one of claims 1 to 4, comprising the steps of:
(1) weighing the raw materials according to the parts by weight;
(2) adding the filler, water and the curing agent into a high-speed stirrer and uniformly stirring;
(3) and adding the environment-friendly resin into a stirrer, adding a dispersing agent, and continuously stirring until the dispersing agent is uniformly dispersed to obtain the coating of the lock rod.
6. A process for spraying a coating layer of a locking bar according to claim 5, comprising the steps of:
s1, removing the skinned and bulged old paint skin or thick rust layer on the surface of the lock rod, polishing and rinsing with water;
s2, firstly, spraying a coating on the rust layer, the periphery of the firm old paint layer and the welding seam of the lock rod for primary treatment to ensure that the rust layer, the periphery of the firm old paint layer and the welding seam are fully permeated and converted, and then, coating the surface of the lock rod together with the primary treated part on the whole surface by using the coating to form a first protective film;
and S3, when the surface of the first protective film is dry, brushing a second protective film, and drying at 40-45 ℃ for 20-24h to finish the surface anticorrosion treatment of the lock rod.
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|---|---|---|---|
| CN202110777134.4A CN113429872A (en) | 2021-07-09 | 2021-07-09 | Locking rod spraying process |
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| CN202110777134.4A CN113429872A (en) | 2021-07-09 | 2021-07-09 | Locking rod spraying process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114850009A (en) * | 2022-06-21 | 2022-08-05 | 广东景元设备有限公司 | Coating process of lock rod for cabinet body |
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| CN111171700A (en) * | 2020-01-16 | 2020-05-19 | 骋润(嘉兴)新材料科技有限公司 | Anticorrosive coating and coating process thereof |
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| KR20100078473A (en) * | 2008-12-30 | 2010-07-08 | 한국신발피혁연구소 | Primer composition for improved adhesion |
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