CN114540804A - Chromium-free passivation solution based on amino modified polysiloxane and preparation method thereof - Google Patents
Chromium-free passivation solution based on amino modified polysiloxane and preparation method thereof Download PDFInfo
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- CN114540804A CN114540804A CN202210173253.3A CN202210173253A CN114540804A CN 114540804 A CN114540804 A CN 114540804A CN 202210173253 A CN202210173253 A CN 202210173253A CN 114540804 A CN114540804 A CN 114540804A
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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
- C23C22/05—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 using aqueous solutions
- C23C22/06—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 using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/40—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 using aqueous solutions using aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
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Abstract
The invention discloses a chromium-free passivation solution based on amino modified polysiloxane, which is used for hot dip galvanized metal surfaces and comprises amino modified polysiloxane, water-soluble resin, organic acid, molybdate, benzotriazole, glycol and the like, wherein the amino modified polysiloxane is prepared by reacting octamethylcyclotetrasiloxane, N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali glue and 18-crown ether-6 under the protection of argon gas at the temperature of 95 +/-5 ℃; wherein the alkali glue is prepared by reacting octamethylcyclotetrasiloxane and potassium hydroxide under the protection of argon at the temperature of 110 +/-5 ℃. The obtained chromium-free passivation solution has excellent film forming effect, corrosion resistance, blackening resistance and coating property, can greatly prolong the service life of a workpiece, has simple production process, low cost, good stability, no toxicity and no harm, can not volatilize toxic substances in the natural drying process, and meets the requirement of environmental protection.
Description
Technical Field
The invention relates to the technical field of hot galvanizing passivation, in particular to a chromium-free passivation solution based on amino modified polysiloxane and a preparation method thereof.
Background
Hot galvanizing is the most widely used way in the world at present and can effectively prevent steel from being corroded by the atmosphere, and has incomparable advantages in the aspects of coating economy, coating durability, protection characteristics of the combination of physical barrier protection and electrochemical protection of the coating and the like. However, in a humid environment, especially in a damp and hot environment, a dark gray or white loose corrosion product white rust is easily formed on the surface of the galvanized layer, so that the anticorrosion effect is lost, and the appearance and the performance of the steel part are affected. In order to improve the corrosion resistance of the plating layer, the plating layer needs to be passivated, and a compact passivation film is formed on the surface of the plating layer, so that the surface of the plating layer is protected from oxidation corrosion, and the service life of a workpiece is prolonged. The traditional galvanizing process mostly adopts solution with hexavalent chromium or trivalent chromium as a main component for passivation treatment, but the hexavalent chromium has higher toxicity and carcinogenicity to human bodies, so that the hexavalent chromium has great harm to the human bodies and the environment, and the use of the hexavalent chromium is strictly limited by governments in various countries; although the toxicity of the trivalent chromium is low, the trivalent chromium is oxidized into the hexavalent chromium after being used for a period of time, so the problem of the toxicity of the hexavalent chromium cannot be fundamentally solved by using the trivalent chromium passivation process.
With the increasing environmental protection requirements of China, the hot galvanizing technology is developing towards low energy consumption, low pollution and high quality, and the development of the chromium-free passivator with economy, environmental protection and excellent performance is particularly important.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the chromium-free passivation solution for the surface of the hot-dip galvanized metal, which not only can ensure the environmental friendliness of the passivation solution and eliminate the harm of chromium pollution, but also can ensure the excellent film forming and protecting effects of the passivation solution, can obviously improve the corrosion resistance of a coating compared with the prior chromate passivation solution, and prolongs the service life of a workpiece.
In order to achieve the purpose, the chromium-free passivation solution based on the amino modified polysiloxane provided by the invention is used for hot-dip galvanized metal surfaces and comprises the following components in parts by mass:
5-15 parts of amino modified polysiloxane,
4-6 parts of water-soluble resin,
1-3 parts of organic acid,
0.5 to 2 parts of molybdate,
0.5-2 parts of benzotriazole, wherein the total mass of molybdate and benzotriazole is not more than 2 parts,
10-15 parts of ethylene glycol,
water is added to make up 100 parts;
the amino modified polysiloxane is prepared by reacting octamethylcyclotetrasiloxane, N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali glue and 18-crown ether-6 under the protection of argon at the temperature of 95 +/-5 ℃; wherein the alkali glue is prepared by reacting octamethylcyclotetrasiloxane and potassium hydroxide under the protection of argon at the temperature of 110 +/-5 ℃.
According to the chromium-free passivation solution, the specific amino modified polysiloxane is used as a main film forming substance, the water-soluble resin is used as an auxiliary film forming substance, the two substances are compounded to form a film, silanol formed by hydrolysis of amino introduced polysiloxane is utilized, one end of silanol is coupled with hydroxyl on the surface of a passivated metal matrix, and the other end of silanol is combined with the water-soluble resin, so that a compact film body is formed in a better combination mode, the film forming efficiency is improved, the hardness of the passivated film is improved by the water-soluble resin, the film is not easy to fall off in the collision friction process, the adhesion force of the passivated film and the metal surface is effectively improved, and the water resistance of the film is enhanced. Molybdate and benzotriazole with corrosion inhibition effect are further added on the basis of film formation, and are combined with the organic silicon passivation film to act on the metal surface, so that the corrosion resistance of the organic silicon passivation film is greatly improved. In the aspect of directional amino modification of polysiloxane, alkali glue prepared from octamethylcyclotetrasiloxane and potassium hydroxide is used as a catalyst for siloxane polymerization reaction, and potassium hydroxide is used as a catalyst core, so that the molecular weight of polysiloxane can be effectively controlled, the viscosity of polysiloxane can be controlled, and the passivation effect is prevented from being lost due to overhigh viscosity; potassium hydroxide in the alkali glue is uniformly dispersed by using octamethylcyclotetrasiloxane, so that the stable reaction is promoted, and the nonuniform aggregation when the polymerization reaction is just started is avoided; 18-crown ether-6 is used as a reaction promoter, and an electron supplying substance is provided to pull open the counter ions to expose the active center, so that the reaction is facilitated and is complete; thereby obtaining more advantageous modification performance, effectively replacing the action of chromate in the passivating agent, not only ensuring the environmental friendliness of the passivating solution, but also ensuring the excellent film forming and protecting effects of the passivating solution.
The technical scheme is limited, the mass ratio of octamethylcyclotetrasiloxane, N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali glue and 18-crown ether-6 used for preparing the amino modified polysiloxane is 100 (16-24), 2-4, 90-100, 1-2; the mass ratio of octamethylcyclotetrasiloxane to potassium hydroxide used for preparing the alkali glue is 100 (2-4).
As a limitation to the above technical solution, the water-soluble resin includes at least one of a water-soluble acrylic resin, a water-soluble polyurethane, and a water-soluble epoxy resin.
As a limitation to the above technical solution, the total mass of the amino-modified polysiloxane and the water-soluble resin in the chromium-free passivating agent accounts for not less than 10% and not more than 20%.
As a limitation to the above technical solution, the organic acid includes at least one of citric acid, tannic acid, and tartaric acid.
As a limitation to the above technical solution, the molybdate includes at least one of sodium molybdate, potassium molybdate and ammonium molybdate.
The dosage proportion of each raw material in the modification reaction is further limited to obtain more excellent amino modified polysiloxane component raw materials, which is beneficial to the cooperative matching among passivation solution components; the optional raw materials of the water-soluble resin, the relevance of the amino modified polysiloxane and the water-soluble resin and the optional raw materials of the organic acid are limited, and the formula and the performance of the passivation solution are improved.
Meanwhile, the invention also provides a preparation method of the amino modified polysiloxane-based chromium-free passivation solution, which comprises the steps of completely dissolving benzotriazole in ethylene glycol, respectively dissolving organic acid and molybdate in water, sequentially adding the organic acid and the molybdate into the ethylene glycol solution of benzotriazole, sequentially adding water-soluble resin and amino modified polysiloxane, and continuously stirring at normal temperature for 0.5-1 h to obtain the chromium-free passivation solution.
The preparation of the chromium-free passivation solution comprises the steps of taking ethylene glycol as a cosolvent, dissolving benzotriazole, organic acid and molybdate in the ethylene glycol in sequence to ensure the uniformity of the solution, and then adding water-soluble resin and amino modified polysiloxane in sequence for reaction to improve the compounding effect among the components, thereby obtaining the passivation solution with high film forming efficiency and excellent corrosion protection performance.
As a limitation to the above technical solution, the amino-modified polysiloxane is prepared by the following method:
adding octamethylcyclotetrasiloxane, N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali gum and 18-crown ether-6 into a reactor filled with argon according to a proportion, uniformly stirring, reacting at 95 +/-5 ℃ for 4-5 h, adding propionic acid for neutralizing, reducing the pressure to-0.1 to-0.09 MPa at the temperature of 45-60 ℃, and removing low-boiling-point substances to obtain the amino modified polysiloxane.
As a limitation to the above technical solution, the preparation of the alkali glue adopts the following method:
under the protection of argon gas, adding octamethylcyclotetrasiloxane and potassium hydroxide in proportion, stirring at 110 +/-5 ℃ and reacting for 90-150 min to obtain the transparent colloidal alkali glue.
Further limits the preparation method of the amino modified polysiloxane and the alkali glue, effectively controls the performance of the amino modified polysiloxane, is more beneficial to the synergistic interaction among the components of the chromium-free passivation solution, and exerts the advantage of film-forming performance.
The chromium-free passivator based on the amino modified polysiloxane has an excellent film forming effect, can effectively improve the corrosion resistance, blackening resistance and coating property of the metal surface after being used for passivating the hot-galvanized metal surface, has simple use conditions, can be completely dried within 20 hours in a ventilation environment at the temperature of more than 10 ℃, has no change in the appearance of the passivated metal surface, greatly prolongs the service life of a workpiece, and saves the economic cost.
The passivating agent disclosed by the invention is simple in production process, low in cost and good in stability, does not turn yellow after being placed for a long time due to amino contained in the passivating solution, has a quality guarantee period of twelve months, is beneficial to industrial production and application, is non-toxic and harmless, does not volatilize toxic substances in the natural airing process, and meets the requirement of environmental protection.
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 chemicals of the following examples and comparative examples are typical products purchased in the market.
Example 1
A chromium-free passivation solution based on amino modified polysiloxane is prepared according to the following steps.
(1) And preparing amino modified polysiloxane:
a. under the argon protection environment, 100 parts of octamethylcyclotetrasiloxane and 2 parts of potassium hydroxide are added into a reactor, and stirred and reacted for 100min at 110 ℃ to obtain transparent colloidal alkali glue for later use;
b. adding 100 parts of octamethylcyclotetrasiloxane, 19 parts of N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, 2 parts of hexamethyldisiloxane, 90 parts of alkali glue and 1 part of 18-crown ether-6 into a reactor filled with argon, uniformly stirring, reacting at 95 +/-5 ℃ for 4.5 hours, adding 5 parts of propionic acid for neutralization, reducing the pressure to-0.1 to-0.09 MPa at the temperature of 50-55 ℃, and removing low-boiling-point substances to obtain amino modified polysiloxane;
(2) preparing a chromium-free passivation solution:
taking 8 parts of amino modified polysiloxane, 6 parts of water-soluble acrylic resin (with the solid content of 35-40%), 1 part of citric acid, 0.5 part of sodium molybdate, 1 part of benzotriazole, 10 parts of ethylene glycol and 73.5 parts of water; firstly, completely dissolving benzotriazole in ethylene glycol, then respectively dissolving organic acid and molybdate in water, sequentially adding the organic acid and molybdate into an ethylene glycol solution of benzotriazole, finally sequentially adding water-soluble resin and amino modified polysiloxane, and continuously stirring for 0.5h at normal temperature to obtain the chromium-free passivation solution.
Example 2
Chromium-free passivator: 10 parts of amino modified polysiloxane, 6 parts of water-soluble acrylic resin, 2 parts of citric acid, 0.5 part of sodium molybdate, 1 part of benzotriazole, 10 parts of ethylene glycol and 70.5 parts of water.
The preparation methods of the amino-modified polysiloxane and the passivating agent are the same as those in example 1, and the raw material component ratio of the alkali glue used for preparing the amino-modified polysiloxane are the same as those in example 1.
Example 3
Chromium-free passivator: 14 parts of amino modified polysiloxane, 5 parts of water-soluble acrylic resin, 1 part of citric acid, 0.5 part of sodium molybdate, 1 part of benzotriazole, 10 parts of ethylene glycol and 68.5 parts of water.
Wherein the preparation methods of the amino modified polysiloxane and the passivating agent are the same as those of the embodiment 1, and the raw material components used for preparing the amino modified polysiloxane are octamethylcyclotetrasiloxane, N-beta (aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali glue and 18-crown ether-6 in a mass ratio of 100:18:3:97: 1; the mass ratio of octamethylcyclotetrasiloxane to potassium hydroxide used for preparing the alkali glue is 100: 3.
Example 4
Chromium-free passivator: 8 parts of amino modified polysiloxane, 6 parts of water-soluble epoxy resin, 1 part of tannic acid, 1 part of potassium molybdate, 0.5 part of benzotriazole, 15 parts of ethylene glycol and 68.5 parts of water.
Wherein the preparation methods of the amino modified polysiloxane and the passivating agent are the same as those of the embodiment 1, and the raw material components used for preparing the amino modified polysiloxane comprise octamethylcyclotetrasiloxane, N-beta (aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali glue and 18-crown ether-6 in a mass ratio of 100:20:3.5:95: 1.5; the mass ratio of octamethylcyclotetrasiloxane to potassium hydroxide used for preparing the alkali glue is 100: 3.
Example 5
Chromium-free passivator: 8 parts of amino modified polysiloxane, 6 parts of water-soluble epoxy resin (with the solid content of 35-40%), 1 part of tannic acid, 1 part of potassium molybdate, 0.5 part of benzotriazole, 15 parts of ethylene glycol and 68.5 parts of water.
Wherein the preparation methods of the amino modified polysiloxane and the passivating agent are the same as those of the embodiment 1, and the raw material components used for preparing the amino modified polysiloxane comprise octamethylcyclotetrasiloxane, N-beta (aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali glue and 18-crown ether-6 in a mass ratio of 100:22:3:98: 2; the mass ratio of octamethylcyclotetrasiloxane to potassium hydroxide used for preparing the alkali glue is 100: 2.
The chromium-free passivators obtained in examples 1 to 5 are all white to colorless transparent solutions, and the pH value is 10.5 to 12.
Comparative example 1
Chromium-free passivator: 6 parts of water-soluble acrylic resin (with the solid content of 35-40%), 1 part of citric acid, 0.5 part of sodium molybdate, 1 part of benzotriazole, 10 parts of ethylene glycol and 81.5 parts of water. Firstly, completely dissolving benzotriazole in ethylene glycol, then respectively dissolving organic acid and sodium molybdate in water, sequentially adding the organic acid and sodium molybdate into an ethylene glycol solution of benzotriazole, finally adding water-soluble acrylic resin, and continuously stirring for 0.5h at normal temperature to obtain the chromium-free passivation solution.
Comparative example 2
Chromium-free passivator: 10 parts of polysiloxane, 6 parts of water-soluble acrylic resin, 1 part of citric acid, 0.5 part of sodium molybdate, 1 part of benzotriazole, 12 parts of ethylene glycol and 69.5 parts of water.
Preparation of polysiloxane: 100g of octamethylcyclotetrasiloxane, 2g of potassium hydroxide, 1g of nonionic emulsifiers OP-7 and OP-10 respectively and 200g of water are mixed uniformly and stirred in a container at 60 ℃ for reaction for 3 hours to obtain the final product.
Comparative example 3
Chromium-free passivator: 8 parts of amino modified polysiloxane, 6 parts of water-soluble acrylic resin, 1 part of citric acid, 0.5 part of sodium molybdate, 1 part of benzotriazole, 10 parts of ethylene glycol and 73.5 parts of water.
The preparation raw materials of the amino modified polysiloxane are octamethylcyclotetrasiloxane, N-beta (aminoethyl) -gamma-aminopropylmethyldiethoxysilane and alkali glue in a mass ratio of 100:22: 98; the base gum was prepared using octamethylcyclotetrasiloxane and potassium hydroxide in a 100:2 mass ratio, and the procedure was the same as in example 1.
Comparative example 4
Chromium-free passivator: 8 parts of amino modified polysiloxane, 6 parts of water-soluble acrylic resin, 1 part of citric acid, 0.5 part of sodium molybdate, 1 part of benzotriazole, 10 parts of ethylene glycol and 73.5 parts of water.
The amino-modified polysiloxane was prepared as follows: adding 2 parts of potassium hydroxide and 1 part of 18-crown ether-6 into a reactor filled with argon, dissolving in water, uniformly stirring, adding 200 parts of octamethylcyclotetrasiloxane, 2 parts of hexamethyldisiloxane and 20 parts of N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, uniformly stirring, reacting at 95 +/-5 ℃ for 4.5 hours, adding 5 parts of propionic acid for neutralization, decompressing to-0.1 to-0.09 MPa at 50-55 ℃, and removing low-boiling-point substances to obtain the low-boiling-point silicone oil.
Comparative example 5
Passivating agent: 9g/L of chromic anhydride, 6ml/L of nitric acid, 0.5ml/L of sulfuric acid, about 1.5-2.0 of pH and 10s of passivation.
The performance of each passivation solution of examples and comparative examples was evaluated.
The workpieces with the same specification are treated by the passivation method and then are subjected to performance test.
Passivation method
The sample selecting and cleaning method refers to the national standard GB/T10125-. And completely immersing the sample into the prepared chromium-free passivation solution at room temperature, taking out after soaking for 30s, naturally airing for 24h, and then carrying out performance test.
The results of the performance testing are shown in the following table.
The comparative test results show that: the amino modified polysiloxane can effectively improve the corrosion resistance of a film formed on the surface of a zinc layer by resin, and the chromium-free passivation solution has better corrosion resistance and weather resistance.
In conclusion, the chromium-free passivation solution disclosed by the invention has excellent film forming effect, corrosion resistance, blackening resistance and coating property, can greatly prolong the service life of a workpiece, is simple in production process, low in cost, good in stability, non-toxic and harmless, does not volatilize toxic substances in the natural airing process, and meets the requirement of environmental protection.
Claims (9)
1. A chromium-free passivation solution based on amino modified polysiloxane is used for hot dip galvanized metal surfaces and is characterized by comprising the following components in parts by mass:
5-15 parts of amino modified polysiloxane,
4-6 parts of water-soluble resin,
1-3 parts of organic acid,
0.5 to 2 parts of molybdate,
0.5-2 parts of benzotriazole, wherein the total mass of molybdate and benzotriazole is not more than 2 parts,
10-15 parts of ethylene glycol,
water is added to make up 100 parts;
the amino modified polysiloxane is prepared by reacting octamethylcyclotetrasiloxane, N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali glue and 18-crown ether-6 under the protection of argon at the temperature of 95 +/-5 ℃; wherein the alkali glue is prepared by reacting octamethylcyclotetrasiloxane and potassium hydroxide under the protection of argon at the temperature of 110 +/-5 ℃.
2. The chromium-free passivation solution based on amino-modified polysiloxane according to claim 1, characterized in that: the mass ratio of octamethylcyclotetrasiloxane, N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali glue and 18-crown ether-6 used for preparing the amino modified polysiloxane is 100 (16-24), 2-4, 90-100 and 1-2; the mass ratio of octamethylcyclotetrasiloxane to potassium hydroxide used for preparing the alkali glue is 100 (2-4).
3. The chromium-free passivation solution based on amino-modified polysiloxane according to claim 1, characterized in that: the water-soluble resin comprises at least one of water-soluble acrylic resin, water-soluble polyurethane and water-soluble epoxy resin.
4. The chromium-free passivation solution based on amino-modified polysiloxane according to claim 1, characterized in that: the total mass of the amino modified polysiloxane and the water-soluble resin in the chromium-free passivator accounts for not less than 10% and not more than 20%.
5. The chromium-free passivation solution based on amino-modified polysiloxane according to claim 1, characterized in that: the organic acid comprises at least one of citric acid, tannic acid and tartaric acid.
6. The chromium-free passivation solution based on amino-modified polysiloxane according to claim 1, characterized in that: the molybdate comprises at least one of sodium molybdate, potassium molybdate and ammonium molybdate.
7. A method for preparing the amino modified polysiloxane-based chromium-free passivation solution as claimed in any one of claims 1 to 6, characterized in that: the preparation method comprises the steps of completely dissolving benzotriazole in ethylene glycol, dissolving organic acid and molybdate in water respectively, adding the solution into an ethylene glycol solution of benzotriazole in sequence, adding water-soluble resin and amino modified polysiloxane in sequence, and stirring continuously at normal temperature for 0.5-1 h to obtain the chromium-free passivation solution.
8. The method for preparing the chromium-free passivation solution based on amino-modified polysiloxane according to claim 7, characterized in that the amino-modified polysiloxane is prepared by adopting the following method:
adding octamethylcyclotetrasiloxane, N- (beta-aminoethyl) -gamma-aminopropylmethyldiethoxysilane, hexamethyldisiloxane, alkali gum and 18-crown ether-6 into a reactor filled with argon according to a proportion, uniformly stirring, reacting at the temperature of 95 +/-5 ℃ for 4-5 hours, adding propionic acid for neutralization, and then decompressing and removing low-boiling-point substances to obtain the amino modified polysiloxane.
9. The preparation method of the chromium-free passivation solution based on amino modified polysiloxane according to claim 8, characterized in that the alkali glue is prepared by adopting the following method:
under the protection of argon gas, adding octamethylcyclotetrasiloxane and potassium hydroxide in proportion, stirring at 110 +/-5 ℃ and reacting for 90-150 min to obtain the transparent colloidal alkali glue.
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| CN107587125A (en) * | 2017-07-19 | 2018-01-16 | 合肥普庆新材料科技有限公司 | It is a kind of for the chrome-free tanning agent of die casting aluminium and its preparation, application |
| CN109763120A (en) * | 2018-12-19 | 2019-05-17 | 长沙艾森设备维护技术有限公司 | The more water-base metal antirusting agents of environment-friendly type and preparation method |
| CN114015354A (en) * | 2021-10-28 | 2022-02-08 | 中科院广州化学有限公司 | Water-based organic silicon long-acting protective coating and preparation method and application thereof |
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| CN116240534A (en) * | 2023-01-17 | 2023-06-09 | 帕珂表面处理技术(上海)有限公司 | Steel plate passivation solution, preparation method thereof and method for passivating coated steel plate |
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