CN110777374A - Corrosion-resistant metal surface pretreatment agent and preparation method thereof - Google Patents
Corrosion-resistant metal surface pretreatment agent and preparation method thereof Download PDFInfo
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
- C23C22/80—Pretreatment of the material to be coated with solutions containing titanium or zirconium compounds
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Abstract
The invention belongs to the technical field of metal surface treatment, in particular to a corrosion-resistant metal surface pretreatment agent and a preparation method thereof, wherein water is used as a solvent, a zirconium aluminate coupling agent and an organic chromium coupling agent are used as film forming agents, and organosiloxane is added as an auxiliary film forming agent, the zirconium aluminate coupling agent film forming and the organic chromium film forming are carried out during film forming and are mutually doped to form a compact inorganic-organic hybrid film, the organosiloxane can overcome defects in the film forming process in time, the structure and the distribution of the film are improved, zirconium and chromium in the components can simultaneously react with multiple groups in the film, the sealing effect is obviously improved, the cost is reduced, the defects in the film are better perfected and sealed, the preparation method is simple, multiple functions of degreasing, oil removal and film forming are simultaneously realized, the working procedure is greatly simplified, the energy is saved, the cost is low, the normal-temperature operation can be realized on the whole line, and the treatment, the defects of pollution, labor protection, environmental protection, energy conservation and the like are overcome.
Description
Technical Field
The invention belongs to the technical field of metal surface treatment, and particularly relates to a corrosion-resistant metal surface pretreatment agent and a preparation method thereof.
Background
At present, the requirements on the surface of metal parts are gradually improved, and the special properties including high temperature resistance, oxidation resistance, fatigue resistance, corrosion resistance, radiation protection, insulation, magnetic conduction, electric conduction, decoration and the like have higher requirements. But aiming at the problems of the environment-friendly coupling agent type metal surface pretreatment agent and the corresponding solution, the market has a better solution. Silane is dissolved in a solvent and is applied to the surface of metal, so that the effect is good, but the solvent is volatilized in the using process to cause environmental pollution, and the cost is high. The method has the advantages that the method is used for carrying out good pretreatment on the surface of the metal part, improving the characteristics of corrosion resistance and the like of the metal surface, and improving the quality of the product, so that a good application effect is obtained, a large number of process routes are effectively saved in the process of practical application, two washing process flows are omitted, the working efficiency is improved, the discharge amount of waste water is effectively reduced, and the method has positive significance and effect on the aspect of environmental protection, and has a wide application prospect. However, since the silane metal surface treatment agent has an increased pH value to facilitate the silanol condensation polymerization, the increase in pH value causes flocculation to cause the treatment agent to be ineffective, so that the industrial large-scale application is limited. Silicon does not produce harmful heavy metal ions in the practical application process, does not contain phosphorus, does not need heating, has short treatment time, does not produce sediment in the treatment process, can effectively save corresponding surface adjustment procedures, can be repeatedly used in the tank liquor in the working process, and has high market demand and performance requirement for the film-forming metal pretreatment agent with strong environmental protection performance. Aiming at the existing environment-friendly silane metal surface pretreatment agent, the technical personnel in the field need to develop a metal surface pretreatment agent with low price and corrosion resistance to meet the market demand and performance requirement.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art and provides a metal surface pretreatment agent and a preparation method thereof, which can form a three-dimensional space network-shaped inorganic/organic hybrid composite film on the surfaces of metals such as cold rolled steel, hot rolled steel, stainless steel, aluminum alloy and the like, have extremely strong compactness and uniform distribution, extremely strong binding capacity with metals and coatings, low cost and improve the obvious defects of silanol condensation polymerization, high cost, easy pollution, non-uniform distribution, non-corrosion resistance and the like of the metal surface treatment pretreatment agent.
The invention is realized by the following technical scheme:
the technical scheme adopted by the invention for solving the problems is as follows:
a metal surface pretreatment agent takes water as a solvent, takes a zirconium aluminate coupling agent and an organic chromium coupling agent as film forming agents, and adds organosiloxane as an auxiliary film forming agent.
According to the scheme, the metal surface pretreatment agent also comprises the following components: propanol, diethylenetriamine, diethyl diisostearoyl titanate, polyvinyl alcohol, epoxy resin emulsion, peregal O-9, molybdenum dialkyl dithiocarbamate, cobalt naphthenate and polyethylene glycol.
According to the scheme, the metal surface pretreatment agent comprises the following components in parts by weight: 100-105 parts of deionized water, 3-5 parts of organosiloxane, 7-9 parts of propanol, 18-23 parts of zirconium aluminate coupling agent, 0.5-1 part of diethylenetriamine, 8-12 parts of organic chromium coupling agent, 0.2-0.4 part of diethyl diisostearoyl titanate, 2-4 parts of polyvinyl alcohol, 2-4 parts of epoxy resin emulsion, 90.2-0.5 part of peregal O-90, 0.4-0.6 part of molybdenum dialkyl dithiocarbamate, 0.01-0.05 part of cobalt naphthenate and 0.2-0.4 part of polyethylene glycol.
According to the scheme, the organic siloxane is one or a mixture of more than one of 3-aminopropylmethyldimethoxysilane, glycidoxypropylmethyldiethoxysilane and 1, 2-di (trialkoxysilyl) ethane.
According to the scheme, the epoxy resin emulsion is xylene solvent diluted epoxy resin emulsion, the average particle size of the epoxy resin emulsion is 0.1-0.5 mu m, and the solid content of the epoxy resin emulsion is 60-70%.
According to the scheme, the preparation method of the zirconium aluminate coupling agent comprises the steps of adding 7-8 parts of basic aluminum chloride and 10-13 parts of deionized water into a reaction kettle with a stirring and refluxing device, stirring until the basic aluminum chloride and the deionized water are completely dissolved, slowly adding 1-2 parts of concentrated sulfuric acid, controlling the temperature to be 60-65 ℃, fully reacting, then adding 10-12 parts of ethanol, heating until the ethanol flows back, then adding 1.4-1.6 parts of 1, 2-propylene glycol for reflux reaction for 0.5-1 h, evaporating the solvent after the reaction is finished, placing the product in a vacuum drying oven at 100 ℃ to obtain a light yellow solid, dissolving the light yellow solid with equal mass of ethanol to form an ethanol solution of a basic aluminum chloride-propylene glycol complex, taking 1.4-1.6 parts of zirconium oxychloride, 6-7 parts of propylene glycol and l-2 parts of lauric acid, heating and refluxing for 0.5-0.6 h in a three-neck flask, adding the ethanol solution of the basic aluminum chloride-propylene glycol complex, and continuously reacting for 0.5-1 h under reflux, and evaporating partial solvent after reaction, and drying the precipitate at 50-60 ℃ for 0.5-1 h to obtain the catalyst.
According to the scheme, the zirconium aluminate coupling agent is an aluminum-zirconium organic metal complex coupling agent with the molar ratio of aluminum to zirconium being 6-8. :
according to the scheme, the organic chromium coupling agent is a complex of methacrylic acid chromium chloride, and the chromium content is 5.6-7.3%.
The preparation method of the metal surface pretreatment agent mainly comprises the following steps:
(1) adding a zirconium aluminate coupling agent into a stirring kettle according to the proportion of the formula, then adding diethylenetriamine, stirring for 3-4 minutes at the speed of 300-400 rpm, then adding an organic chromium coupling agent, stirring for 3-5 minutes at the speed of 300-400 rpm, then adding sodium perfluorooctanoate and diethyl diisostearoyl titanate, and stirring for 30-40 minutes at room temperature and under the protection of nitrogen at the speed of 350-450 rpm to obtain a compound silane coupling agent A;
(2) injecting deionized water into a stirring kettle according to a formula ratio, adding organosiloxane into the kettle in a stirring state, adding propanol after stirring for 1-2 minutes, continuing stirring for 2-3 minutes, adding polyvinyl alcohol, and stirring for 5-6 minutes to obtain a mixed solution B, wherein the stirring speed is 2000-2500 rpm;
(3) mixing A and B, sequentially adding epoxy resin emulsion, peregal O-9, molybdenum dialkyl dithiocarbamate and polyethylene glycol, and reacting at a constant temperature of 50-60 ℃ under a stirring state to obtain a mixed solution C;
(4) and finally, adding cobalt naphthenate, and stirring for 10-15 minutes to obtain a final product.
The invention has the beneficial effects that:
the invention provides a corrosion-resistant metal surface pretreatment agent and a preparation method thereof, wherein a zirconium aluminate coupling agent which is mainly used for a zirconium aluminate-containing inorganic polymer with low relative molecular mass in the field of plastic fillers is used, and 2 organic coordination groups are complexed on a molecular main chain of the zirconium aluminate coupling agent. One ligand can provide the hydroxyl stability and hydrolytic stability of the coupling agent, and the other ligand can provide the coupling agent with good organic reaction activity, thereby further improving the interface activity to silicon-oxygen bond and amino. The film forming reaction of the aluminum-zirconium coupling agent and the metal is mainly carried out through A1-Zr
xTo be coordinated with each other. The aluminum-zirconium coupling agent can perform irreversible reaction with the surface at normal temperature to achieve the film forming effect, while the common coupling agent needs to be at a certain temperature, and the unexpected discovery in practice shows that the addition of the zirconium aluminate coupling agent and the organic chromium coupling agent in cooperation can not only greatly improve the strength of a processed film layer, but also obviously improve the dispersibility of the processing agent, improve the film forming performance and homogenize the film layer. The metal surface pretreatment agent added with the above two has good metal surface characteristics, higher decomposition temperature, good water solubility and lower cost, the adopted organic chromium coupling agent is a complex metal chromium compound formed by unsaturated organic acid and trivalent chromium atoms, one end of the complex metal chromium compound contains active unsaturated groups and can react with the metal surface, and the other end of the complex metal chromium compound is combined with the siloxane silicon-oxygen bond of the organic siloxane by depending on the complex chromium atoms. The zirconium aluminate coupling agent and the organic chromium coupling agent used in the invention are used as main film forming agents, so that the interface combination of metal and organic matters can be promoted, the viscosity of a filling system of the treating agent can be remarkably reduced, and when the zirconium coupling agent is not used, the interaction between particles is easy to occur due to the existence of hydroxyl or other aqueous groups on the surface of the metal, so that the film is condensed, and the film is dispersed unevenly. After the zirconium aluminate coupling agent and the organic chromium coupling agent are added, the interaction between the components of the treating agent can be inhibited, the viscosity is reduced, the water dispersibility is improved, the treatment effect is further improved, the water dispersibility of the two raw materials is good, the cost is low, and the obvious defects of insolubility, hydrolysis, high cost, environment-friendly solvent and the like caused by adding a large amount of silane coupling agent in the prior art are overcome. The silane coupling agent with high price is used as an auxiliary film forming component to better provide the strength of the film, and the increase of the pH value of the silane metal surface treating agent is beneficial to the progress of silanol condensation polymerization, but the increase of the pH value causes the flocculation of the silane metal surface treating agent to cause the invalidation of the treating agent, so that the large-scale application in industry is limited. The metal surface pretreatment agent also comprises a cosolvent, a film cross-linking agent, a dispersing agent, a stabilizing agent and a film layer anti-wear agent, and the comprehensive performance of the metal surface pretreatment agent is further improved.
Compared with the prior art, the invention has the following advantages:
the metal surface pretreatment agent disclosed by the invention is beneficial to accelerating film formation, so that water-soluble silane is adsorbed and crosslinked on the metal surface to form a film and cannot be dissolved in water in a short metal surface treatment time, and a metal workpiece can be immediately washed after leaving a silane treatment process, thereby avoiding the problems of hydrolysis, complex process, solvation pollution and the like of the conventional silane film and realizing the function of fast washing of the treated film; the invention ensures the stability of the aqueous metal pretreatment agent system by introducing the zirconium aluminate coupling agent and the organic chromium coupling agent, and the aqueous and added inorganic salt can be compounded into a uniform solution, so the stability is good, the diluted use can be realized, and the production cost is greatly reduced. The corrosion-resistant metal surface pretreatment agent can obtain a uniform and compact hybrid film on the metal surface, and the film has excellent membrane rust prevention capability of the pretreatment film and coupling capability with a coating. The corrosion-resistant metal surface pretreatment agent can be used for replacing the traditional phosphating treatment technology and is suitable for various industrial fields using metal, such as metal coating, hardware and the like.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
A metal surface pretreatment agent takes water as a solvent, takes a zirconium aluminate coupling agent and an organic chromium coupling agent as film forming agents, and is added with organic siloxane as an auxiliary film forming agent, and the metal surface pretreatment agent also comprises: propanol, diethylenetriamine, diethyl diisostearoyl titanate, polyvinyl alcohol, epoxy resin emulsion, peregal O-9, molybdenum dialkyl dithiocarbamate, cobalt naphthenate and polyethylene glycol.
The metal surface pretreatment agent comprises the following components in parts by weight: 100 parts of deionized water, 3 parts of organic siloxane, 7 parts of propanol, 18 parts of zirconium aluminate coupling agent, 0.5 part of diethylenetriamine, 8 parts of organic chromium coupling agent, 0.2 part of diethyl diisostearyl titanate, 2 parts of polyvinyl alcohol, 2 parts of epoxy resin emulsion, 0.6 part of peregal O-90.2 part of molybdenum dialkyl dithiocarbamate, 0.05 part of cobalt naphthenate and 0.4 part of polyethylene glycol.
Wherein, propanol is taken as a cosolvent, diethylenetriamine is taken as a film-layer cross-linking agent, diethyl diisostearoyl titanate is taken as a film-forming and film-layer dispersing agent, a molybdenum dialkyl dithiocarbamate film-layer antiwear agent, an epoxy resin emulsion, peregal O-9 and polyethylene glycol are taken as surfactants.
According to the scheme, the organic siloxane is 3-aminopropyl methyl dimethoxy silane.
According to the scheme, the preparation method of the zirconium aluminate coupling agent comprises the steps of adding 7 parts of basic aluminum chloride and 10 parts of deionized water into a reaction kettle with a stirring and refluxing device, stirring until the basic aluminum chloride and the deionized water are completely dissolved, slowly adding 2 parts of concentrated sulfuric acid, controlling the temperature to be 60 ℃, adding 10 parts of ethanol after full reaction, heating until the mixture is refluxed, then adding 1.4 parts of 1, 2-propylene glycol for reflux reaction for 0.5h, evaporating the solvent after the reaction is finished, putting the product in a vacuum drying oven at 100 ℃, obtaining light yellow solid, dissolving the light yellow solid by using ethanol with equal mass to form ethanol solution of basic aluminum chloride-propylene glycol complex, taking 1.4 parts of zirconium oxychloride, 6 parts of propylene glycol and l parts of lauric acid, heating and refluxing for 0.5h in a three-neck flask, adding the basic aluminum chloride-propylene glycol complex ethanol solution, and continuously reacting for 0.5h under reflux, evaporating part of solvent after reaction, and drying the precipitate for 1h at 50 ℃.
According to the scheme, the zirconium aluminate coupling agent is an aluminum-zirconium organic metal complex coupling agent with the aluminum-zirconium molar ratio of 6.
According to the scheme, the organic chromium coupling agent is a complex of chromium chloride methacrylate and is a U.S. chemical product Volan E.
According to the scheme, the epoxy resin emulsion is xylene solvent diluted epoxy resin emulsion, the average particle size of the epoxy resin emulsion is 0.5 mu m, and the solid content of the epoxy resin emulsion is 60%.
The preparation method of the metal surface pretreatment agent mainly comprises the following steps:
(1) adding a zirconium aluminate coupling agent, then adding diethylenetriamine into a stirring kettle according to the proportion of the formula, stirring for 3 minutes at the speed of 300rpm, then adding an organic chromium coupling agent, stirring for 3 minutes at the speed of 300rpm, then adding diethyl diisostearoyl titanate into the stirring kettle, and stirring for 30-40 minutes at the speed of 350rpm under the conditions of room temperature and nitrogen protection to obtain a compound silane coupling agent A;
(2) injecting deionized water into a stirring kettle according to a formula ratio, adding organosiloxane into the kettle under a stirring state, stirring for 1 minute, adding propanol, continuing stirring for 2 minutes, adding polyvinyl alcohol, and stirring for 5 minutes to obtain a mixed solution B, wherein the stirring speed is 1000 rpm;
(3) mixing A and B, sequentially adding epoxy resin emulsion, peregal O-9, molybdenum dialkyl dithiocarbamate and polyethylene glycol, and reacting at a constant temperature of 50 ℃ under a stirring state to obtain a mixed solution C;
(4) finally, adding cobalt naphthenate, and stirring for 10 minutes to obtain a final product.
Example 2
In this embodiment, compared with embodiment 1, the organosiloxane is glycidoxypropylmethyldiethoxysilane, and the preparation method of the metal surface pretreatment agent mainly comprises the following steps:
(1) adding a zirconium aluminate coupling agent, then adding diethylenetriamine into a stirring kettle according to the proportion of the formula, stirring for 3 minutes at the speed of 400rpm, then adding an organic chromium coupling agent, stirring for 5 minutes at the speed of 400rpm, then adding diethyl diisostearoyl titanate into the stirring kettle, and stirring for 30 minutes at the speed of 450rpm under the conditions of room temperature and nitrogen protection to obtain a compound silane coupling agent A;
(2) injecting deionized water into a stirring kettle according to a formula ratio, adding organosiloxane into the kettle under a stirring state, stirring for 2 minutes, adding propanol, continuing stirring for 3 minutes, adding polyvinyl alcohol, and stirring for 6 minutes to obtain a mixed solution B, wherein the stirring speed is 1500 rpm;
(3) mixing A and B, sequentially adding epoxy resin emulsion, peregal O-9, molybdenum dialkyl dithiocarbamate and polyethylene glycol, and reacting at a constant temperature of 60 ℃ under a stirring state to obtain a mixed solution C;
(4) finally, adding cobalt naphthenate, and stirring for 15 minutes to obtain a final product.
Example 3
In this example, the organosiloxane was 1, 2-bis (trialkoxysilyl) ethane as compared to example 1, except that the process steps were the same.
Example 4
In this example, compared to example 1, the composition of the metal surface pretreatment agent includes: deionized water 105, organosiloxane 3, propanol 9, zirconium aluminate coupling agent 23, diethylenetriamine 1, organochromium coupling agent 12, diethyl diisostearoyl titanate 0.4, polyvinyl alcohol 4, epoxy resin emulsion 4, peregal O-900.5, molybdenum dialkyldithiocarbamate 0.6, cobalt naphthenate 0.05, polyethylene glycol 0.4, except that the other method steps are the same.
Example 5
In this example, compared with example 2, the composition of the metal surface pretreatment agent comprises: deionized water 105, organic siloxane 10, propanol 9, zirconium aluminate coupling agent 23, diethylene triamine 1, organic chromium coupling agent 12, diethyl diisostearoyl titanate 0.4, polyvinyl alcohol 4, epoxy resin emulsion 4, peregal O-900.5, molybdenum dialkyl dithiocarbamate 0.6, cobalt naphthenate 0.05 and polyethylene glycol 0, 4 are the same except for the other method steps.
Comparative example 1
In this comparative example, compared to example 4, in step (2), the zirconium aluminate coupling agent was omitted except that the process steps were otherwise the same.
Comparative example 2
This comparative example compares to example 4 in step (2), the zirconium aluminate coupling agent and diethyl diisostearoyl titanate are omitted, except that the process steps are otherwise the same.
Comparative example 3
This comparative example compares to example 5, omitting the zirconium aluminate coupling agent in step (2), except that the process steps are otherwise identical.
Comparative example 4
This comparative example compares to example 4 in step (2), the organic chromium coupling agent and zirconium aluminate coupling agent are omitted, except that the process steps are otherwise the same.
Comparative example 5
This comparative example compares to example 2 in step (5), the molybdenum dialkyldithiocarbamate is omitted except that the process steps are the same.
Table 1 raw material amounts, parts by weight, and film layer performance test results for each example and comparative example
Note: wherein A is 3-aminopropylmethyldimethoxysilane, B is glycidoxypropylmethyldiethoxysilane, and C is 1, 2-bis (trialkoxysilyl) ethane. The preparation method of the film layer comprises the following steps: selecting a 70mm multiplied by 150mm multiplied by 1mm steel cold-rolled steel plate (plate model is DC01), weighing the formula amount of the metal surface pretreatment agent to dilute the metal surface pretreatment agent to 5wt% of solid content, putting the degreased and washed cold-rolled steel plate into the degreased and washed cold-rolled steel plate for immersion treatment for 5 minutes to form a coating film on the surface of the metal material, washing the metal material for the second time, drying the metal material after drying the metal material for 20 minutes at 70 ℃, spraying a layer of A04-9 white base baking paint with the thickness of 25 mu m, drying the metal material for 3 minutes at room temperature, then placing the metal material in a blast drying oven for 2 hours at 100 ℃, placing the metal material for 24 hours to be tested at room temperature, using a No. 18 sewing machine needle to cut the paint film into cross diagonals with the length of 120m, sampling three test pieces as far as the test piece matrix, placing the test piece in a salt; the paint film adhesion is tested according to the method specified in GB/T1720; the Baige test was carried out according to the "scratch test for GBT9286-1998 paint and varnish films"; salt spray resistance test the salt spray resistance test was carried out according to "scratch test for paint and varnish films of GB/T9286-1998.
As can be seen from Table 1, the film layer formed on the surface of the cold-rolled sheet by the metal surface pretreatment agent in each example has good adhesion and corrosion resistance, while the film layer of the cold-rolled sheet obtained by the comparative example is not added with a zirconium aluminate coupling agent and an organic chromium coupling agent, and has poor corrosion resistance, the paint films in examples 1 to 5 have good adhesion and excellent neutral salt spray resistance, and the paint film in the comparative example has poor corrosion resistance.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and these modifications and changes are within the protection scope of the present invention.
Claims (6)
1. The corrosion-resistant metal surface pretreatment agent is characterized by being prepared from the following raw materials in parts by weight: 100-105 parts of deionized water, 3-5 parts of organosiloxane, 7-9 parts of propanol, 18-23 parts of zirconium aluminate coupling agent, 0.5-1 part of diethylenetriamine, 8-12 parts of organic chromium coupling agent, 0.2-0.4 part of diethyl diisostearoyl titanate, 2-4 parts of polyvinyl alcohol, 2-4 parts of epoxy resin emulsion, 90.2-0.5 part of peregal O-90, 0.4-0.6 part of molybdenum dialkyl dithiocarbamate, 0.01-0.05 part of cobalt naphthenate and 0.2-0.4 part of polyethylene glycol;
the preparation method of the corrosion-resistant metal surface pretreatment agent comprises the following steps:
(1) adding a zirconium aluminate coupling agent into a stirring kettle according to the formula proportion, then adding diethylenetriamine, stirring for 3-4 minutes at the speed of 300-400 rpm, then adding an organic chromium coupling agent, stirring for 3-5 minutes at the speed of 300-400 rpm, adding diethyl diisostearoyl titanate, and stirring for 30-40 minutes at the speed of 350-450 rpm under the condition of room temperature and nitrogen protection to obtain a compound silane coupling agent A;
(2) injecting deionized water into a stirring kettle according to a formula ratio, adding organosiloxane into the kettle in a stirring state, adding propanol after stirring for 1-2 minutes, continuing stirring for 2-3 minutes, adding polyvinyl alcohol, and stirring for 5-6 minutes to obtain a mixed solution B, wherein the stirring speed is 2000-2500 rpm;
(3) mixing A and B, sequentially adding epoxy resin emulsion, peregal O-9, molybdenum dialkyl dithiocarbamate and polyethylene glycol, and reacting at a constant temperature of 50-60 ℃ under a stirring state to obtain a mixed solution C;
(4) and finally, adding cobalt naphthenate, and stirring for 10-15 minutes to obtain a final product.
2. The corrosion-resistant metal surface pretreatment agent according to claim 1, wherein the organic chromium coupling agent is a complex of chromium chloride methacrylate, and the chromium content is 5.6-7.3%.
3. The corrosion-resistant metal surface pretreatment agent according to claim 1, wherein the zirconium aluminate coupling agent is an aluminum-zirconium organometallic complex coupling agent having an aluminum-zirconium molar ratio of 6 to 8.
4. The corrosion-resistant metal surface pretreatment agent according to claim 1, wherein the zirconium aluminate coupling agent is prepared by adding 7-8 parts of basic aluminum chloride and 10-13 parts of deionized water into a reaction kettle with a stirring and refluxing device, stirring until complete dissolution, slowly adding 1-2 parts of concentrated sulfuric acid, controlling the temperature to 60-65 ℃, after full reaction, adding 10-12 parts of ethanol, heating until reflux, then adding 1.4-1.6 parts of 1, 2-propylene glycol, refluxing for 0.5-1 h, after the reaction, evaporating the solvent, placing the product in a vacuum drying oven at 100 ℃ to obtain a light yellow solid, dissolving with equal mass of ethanol to form an ethanol solution of basic aluminum chloride-propylene oxide complex, taking 1.4-1.6 parts of zirconium chloride, 6-7 parts of propylene glycol and 2 parts of lauric acid, heating and refluxing for 0.5-0.6 h in a three-neck flask, adding the ethanol solution of basic aluminum chloride-propylene glycol complex, and continuously reacting for 0.5-1 h under reflux, evaporating part of the solvent after reaction, and drying the precipitate for 0.5-1 h at 50-60 ℃ to obtain the catalyst.
5. The corrosion-resistant metal surface pretreatment agent of claim 1, wherein the organosiloxane is one or a mixture of more than one of 3-aminopropylmethyldimethoxysilane, glycidoxypropylmethyldiethoxysilane, and 1, 2-bis (trialkoxysilyl) ethane.
6. The pretreatment agent for corrosion-resistant metal surface according to claim 1, wherein the epoxy resin emulsion is xylene-solvent-diluted epoxy resin emulsion having an average particle diameter of 0.1 to 0.5 μm and a solid content of 60 to 70%.
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| CN113773749A (en) * | 2021-09-01 | 2021-12-10 | 宁波市新光货架有限公司 | Corrosion-resistant treating agent for metal goods shelf and corrosion-resistant treatment process for metal goods shelf |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113773749A (en) * | 2021-09-01 | 2021-12-10 | 宁波市新光货架有限公司 | Corrosion-resistant treating agent for metal goods shelf and corrosion-resistant treatment process for metal goods shelf |
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Application publication date: 20200211 |