CN111074263B - Environment-friendly sealant used after phosphorization of wear-resistant rail transit parts and preparation method thereof - Google Patents
Environment-friendly sealant used after phosphorization of wear-resistant rail transit parts and preparation method thereof Download PDFInfo
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- CN111074263B CN111074263B CN201911337743.7A CN201911337743A CN111074263B CN 111074263 B CN111074263 B CN 111074263B CN 201911337743 A CN201911337743 A CN 201911337743A CN 111074263 B CN111074263 B CN 111074263B
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- C—CHEMISTRY; METALLURGY
- 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
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
Abstract
The invention discloses an environment-friendly sealant used after phosphorization of wear-resistant rail transit parts, which is characterized by comprising the following raw materials in percentage by mass: 5-10% of absolute ethyl alcohol, 2-5% of waterborne polyurethane resin, 2-3% of modified organic silicon resin, 2-3% of amino modified organic siloxane oligomer, 2-3% of modified amino siloxane polymer, 2-3% of epoxy silane oligomer and the balance of pure water. The manganese series or zinc-manganese series phosphating film layer has more excellent corrosion resistance, the neutral salt spray resistance test can reach 72 hours, the corrosion resistance is superior to that of the existing sealing liquid, and the use cost is far lower than that of an oil immersion process.
Description
Technical Field
The invention belongs to the field of metal surface pretreatment, and particularly relates to an environment-friendly sealant for phosphating wear-resistant rail transit parts, which does not contain hexavalent chromium ions, has low cost and can enable a manganese or zinc-manganese phosphating film layer to have more excellent corrosion resistance, and a preparation method thereof.
Background
In the rail transit industry, wear-resistant rail transit parts such as gears, springs, pistons, piston rings, camshafts, compressor crankshafts, pipe joints, flanges, fasteners and the like are used in large quantities. In order to improve the corrosion resistance and wear resistance of the parts, the parts are often subjected to phosphating-sealing or oil-soaking treatment after mechanical processing. The phosphating process generally adopts manganese series phosphating or zinc-manganese series phosphating with relatively good wear resistance and corrosion resistance, and the oil immersion and sealing processes can greatly reduce the porosity of a phosphating film layer and improve the corrosion resistance. The oil immersion cost is high, although the sealing liquid is low in cost, the sealing liquid used at present generally contains chromic anhydride, potassium dichromate and sodium dichromate with high concentration, namely contains a large amount of hexavalent chromium ions which are highly toxic substances, and has serious pollution to the environment such as soil, underground water and the like.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides an environment-friendly sealant for phosphating wear-resistant rail transit parts, which has no hexavalent chromium ions, is low in cost and can enable a manganese or zinc-manganese phosphating film layer to have more excellent corrosion resistance, and a preparation method thereof.
The technical solution of the invention is as follows: an environment-friendly sealant used after phosphorization of wear-resistant rail transit parts is characterized by comprising the following raw materials in percentage by mass: 5-10% of absolute ethyl alcohol, 2-5% of waterborne polyurethane resin, 2-3% of modified organic silicon resin, 2-3% of amino modified organic siloxane oligomer, 2-3% of modified amino siloxane polymer, 2-3% of epoxy silane oligomer and the balance of pure water.
The preparation method of the environment-friendly sealant used for phosphating the wear-resistant rail transit parts is characterized by comprising the following steps in sequence: adding pure water and absolute ethyl alcohol into a stirring kettle, and starting a stirring device; and slowly adding the amino modified organic siloxane oligomer, the modified amino siloxane polymer and the epoxy silane oligomer in sequence while stirring, continuously stirring until the solution is clear and transparent, then slowly adding the aqueous polyurethane resin and the modified organic silicon resin, and continuously stirring until the solution is clear and transparent.
The invention is compounded by various silane polymers, modified silicon resin and waterborne polyurethane resin. When a workpiece subjected to phosphating treatment is immersed in a closed working solution, the amino modified organic siloxane oligomer, the modified amino siloxane polymer and the epoxy silane oligomer enter pores of a phosphating film layer and are adsorbed on the surface and the pores of the phosphating film through hydrogen bond action and intermolecular van der Waals force action, and the modified silicon resin and the waterborne polyurethane resin are adsorbed on the surface of the phosphating film through van der Waals force among the amino modified organic siloxane oligomer, the modified amino siloxane polymer and the epoxy silane oligomer. In the dehydration and drying process, not only are the-OH and-NH of various silane polymers3The groups and-OH groups in the phosphating film layer are subjected to dehydration condensation and curing and are firmly adsorbed in the phosphating film layer, and meanwhile, silane polymers pass through-OH and-NH3The groups are subjected to dehydration condensation to form a cross-linked network structure mutually permeated with the phosphating film; the modified silicon resin and the waterborne polyurethane are also subjected to dehydration condensation with-OH groups of silane oligomers and firmly adsorbed on the outer surface of a phosphating film layer, so that a phosphating coating on the surface of a part is changed into a firm, compact, mutually-permeable and cross-linked inorganic-organic composite film layer with a net structure, a manganese series or zinc-manganese series phosphating film layer has more excellent corrosion resistance, a neutral salt spray resistance test can reach 72 hours, the corrosion resistance is superior to that of the existing sealing liquid, and the use cost is far lower than that of an oil immersion process.
Detailed Description
Example 1:
the invention relates to an environment-friendly sealant used for phosphating wear-resistant rail transit parts, which comprises the following raw materials in percentage by mass: 5% of absolute ethyl alcohol, 2% of aqueous polyurethane resin, 2% of modified organic silicon resin, 3% of amino modified organic siloxane oligomer, 2% of modified amino siloxane polymer, 3% of epoxy silane oligomer and the balance of pure water.
The preparation method comprises the following steps in sequence: adding pure water and absolute ethyl alcohol into a stirring kettle, and starting a stirring device; and (3) slowly adding the amino modified organic siloxane oligomer, the modified amino siloxane polymer and the epoxy silane oligomer in sequence while stirring, continuously stirring for 30 minutes until the mixture is clear, slowly adding the aqueous polyurethane resin and the modified organic silicon resin, and continuously stirring for 30 minutes until the solution is completely clear and transparent.
All the raw materials are purchased from other places, wherein the models and production enterprises of part of the raw materials are as follows:
aqueous polyurethane resin, GM-6018 Shanghai Wenjunwei chemical science and technology Co., Ltd;
modified silicone resin, GM-5369 Shanghai Jing chemical science and technology Co., Ltd;
amino-modified organosiloxane oligomer, GD-3120M Shanghai Jian Yihe synthetic chemical Co., Ltd;
modified amino siloxane polymer, GD-3121 Shanghai Jian Yihe synthetic chemical Co., Ltd;
epoxy silane oligomer, J & Y3124W Shanghai Jian Ying Synthesis chemical Co., Ltd.
Example 2:
the invention relates to an environment-friendly sealant used for phosphating wear-resistant rail transit parts, which comprises the following raw materials in percentage by mass: 10% of absolute ethyl alcohol, 5% of waterborne polyurethane resin, 2% of modified organic silicon resin, 2% of amino modified organic siloxane oligomer, 2% of modified amino siloxane polymer, 3% of epoxy silane oligomer and the balance of pure water.
The preparation method and the raw material source are the same as those of the example 1.
Example 3:
the invention relates to an environment-friendly sealant used for phosphating wear-resistant rail transit parts, which comprises the following raw materials in percentage by mass: 7% of absolute ethyl alcohol, 3% of waterborne polyurethane resin, 3% of modified organic silicon resin, 3% of amino modified organic siloxane oligomer, 3% of modified amino siloxane polymer, 2% of epoxy silane oligomer and the balance of pure water.
The preparation method and the raw material source are the same as those of the example 1.
The use process comprises the following steps: according to the mass ratio of 1: 10-1: 25 and deionized water, wherein the pH of the mixed solution is between 8.5 and 9.5, and the mixed solution can be used under the condition of normal temperature without heating. After manganese series phosphating or zinc-manganese series phosphating treatment is carried out on the surface of a steel workpiece, the steel workpiece is fully washed, is directly put into a closed working solution without being dried, is taken out after being soaked for 3-5 min, and is dried by draining, so that the drying treatment can be carried out. The neutral salt spray resistance test time of the examples 1, 2 and 3 can reach 72 hours without being soaked in the anti-rust oil.
Claims (2)
1. An environment-friendly sealant used after phosphorization of wear-resistant rail transit parts is characterized by comprising the following raw materials in percentage by mass: 5-10% of absolute ethyl alcohol, 2-5% of waterborne polyurethane resin, 2-3% of modified organic silicon resin, 2-3% of amino modified organic siloxane oligomer, 2-3% of modified amino siloxane polymer, 2-3% of epoxy silane oligomer and the balance of pure water.
2. The preparation method of the environmentally-friendly sealing agent used for phosphating the wear-resistant rail transit part as claimed in claim 1 is characterized by sequentially comprising the following steps of: adding pure water and absolute ethyl alcohol into a stirring kettle, and starting a stirring device; and slowly adding the amino modified organic siloxane oligomer, the modified amino siloxane polymer and the epoxy silane oligomer in sequence while stirring, continuously stirring until the solution is clear and transparent, then slowly adding the aqueous polyurethane resin and the modified organic silicon resin, and continuously stirring until the solution is clear and transparent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911337743.7A CN111074263B (en) | 2019-12-23 | 2019-12-23 | Environment-friendly sealant used after phosphorization of wear-resistant rail transit parts and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911337743.7A CN111074263B (en) | 2019-12-23 | 2019-12-23 | Environment-friendly sealant used after phosphorization of wear-resistant rail transit parts and preparation method thereof |
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| CN111074263A CN111074263A (en) | 2020-04-28 |
| CN111074263B true CN111074263B (en) | 2022-02-01 |
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| CN101760736B (en) * | 2008-12-26 | 2013-11-20 | 汉高（中国）投资有限公司 | Galvanized steel sheet surface treating agent, galvanized steel sheet and preparation methods thereof |
| CN104294248A (en) * | 2013-07-19 | 2015-01-21 | 无锡永发电镀有限公司 | Environment-friendly passivation technology for wrought aluminium alloy |
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| CN1239127A (en) * | 1999-03-05 | 1999-12-22 | 旭丽股份有限公司 | Organosilicon modified polyurethane paint |
| CN102559140A (en) * | 2010-12-01 | 2012-07-11 | 株式会社富士工程 | Hole sealing processing agent, fastener, bolt and production method thereof |
| CN104059501A (en) * | 2013-05-03 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Anti-rust sealing agent and preparation method and use thereof, and hot-dip plated metal material |
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| CN111074263A (en) | 2020-04-28 |
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