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A kind of epoxy group poss modified metal surface pretreatment agent and preparation method and application thereof

An epoxy-based, treatment agent technology, applied in the direction of metal material coating process, etc., can not solve the problem, generally within a few hours to a few days will be cross-linked, can not replace the phosphating process of the phosphating production line, can not Rinse the membrane with water and other problems to achieve the effects of rapid water washing, improved sealing effect, and guaranteed stability

Inactive Publication Date: 2019-03-15
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in long-term practice, people have found that the organosilanes that can be dissolved in water are mainly aminosilanes and epoxysilanes, but these silanes are not stable after hydrolysis, and generally cross-link within a few hours to a few days
In addition, when the pure silane pretreatment agent is used to treat metals, it first adsorbs on the metal surface through hydrogen bonds. Since the dehydration between Si-OH and Me-OH and Si-OH and Si-OH requires certain conditions, at room temperature or 50 ° C It is difficult to quickly form a stable three-dimensional network structure under the following conditions. Therefore, compared with chromic acid passivation and phosphating, the pure silane treatment agent has a slower film formation speed, and often requires a heating and curing process to obtain a stable silane film. The film cannot be washed with water before the film is completely formed, so it cannot directly replace the phosphating process on the existing phosphating production line

Method used

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  • A kind of epoxy group poss modified metal surface pretreatment agent and preparation method and application thereof
  • A kind of epoxy group poss modified metal surface pretreatment agent and preparation method and application thereof
  • A kind of epoxy group poss modified metal surface pretreatment agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An epoxy-based POSS-modified metal surface pretreatment agent, its composition includes: 67.2 parts of water, 0.3 parts of fluozirconic acid, 0.5 parts of sodium fluozirconate, 2 parts of octa(2,3-ring Oxypropoxypropyl) T8-POSS (CAS registration number: 164017-77-0), 5 parts of 1,2-bis(triethoxysilyl)ethane, 10 parts of 3-aminopropyltriethoxysilane , 5 parts of 3-aminopropylmethyldiethoxysilane, 0.5 parts of copper sulfate, 0.5 parts of lanthanum nitrate, 0.5 parts of ethanol, 0.5 parts of n-butanol, 1 part of 60% nitric acid, 5 parts of 5% hydrochloric acid and 2 parts of lemon acid.

[0039] The preparation method of the metal surface pretreatment agent of above-mentioned epoxy group POSS modification mainly comprises the steps:

[0040] 1) In terms of parts by mass, in 44.2 parts of water, add 1 part of 60% nitric acid and 2 parts of citric acid under stirring. Lanthanum and 0.5 parts of copper sulfate are completely dissolved to obtain component A;

[0041] 2) Ad...

Embodiment 2

[0046] An epoxy-based POSS-modified metal surface pretreatment agent, the composition of which includes: 91.48 parts of water, 0.01 part of fluorozirconic acid, 0.2 part of octa(2,3-glycidoxypropyl) T8 -POSS (CAS registry number: 164017-77-0), 1 part of 1,2-bis(trimethoxysilyl)ethane, 0.3 part of glycidoxypropyltrimethoxysilane, 5 parts of N-aminoethyl - 3-Aminopropyltrimethoxysilane, 1 part nitric acid, 1 part hydrofluoric acid and 0.01 part manganese sulfate.

[0047] The preparation method of the metal surface pretreatment agent of above-mentioned epoxy group POSS modification mainly comprises the steps:

[0048] 1) In terms of parts by mass, in 87.48 parts of water, add 1 part of hydrofluoric acid, 0.01 part of fluozirconic acid and 0.01 part of manganese sulfate under the condition of stirring, and obtain component A after completely dissolving;

[0049] 2) Add 1 part of nitric acid to 4 parts of water under stirring, and add 5 parts of N-aminoethyl-3-aminopropyltrimetho...

Embodiment 3

[0054] An epoxy-based POSS-modified metal surface pretreatment agent, the composition of which includes: 98 parts of water, 0.01 part of fluozirconic acid, 0.01 part of deca(2,3-glycidoxypropyl) T10 -POSS (CAS registration number: 690993-04-5), 0.08 part of 1,2-bis(trimethoxysilyl)ethane, 0.9 part of 3-aminopropyltrimethoxysilane, 0.9 part of citric acid, 0.1 part of sulfuric acid .

[0055] The preparation method of the metal surface pretreatment agent of above-mentioned epoxy group POSS modification mainly comprises the steps:

[0056] 1) Add 0.9 part of citric acid and 0.01 part of fluozirconic acid to 74 parts of water by mass fraction under stirring, and obtain component A after completely dissolving;

[0057] 2) In 24 parts of water, add 0.1 part of sulfuric acid and 0.9 part of 3-aminopropyltrimethoxysilane under stirring, after stirring and dissolving, add 0.01 part of deca(2,3-glycidoxypropyl) T10 -POSS and 0.08 parts of 1,2-bis(trimethoxysilyl)ethane, stirred evenl...

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PUM

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Abstract

The invention discloses an epoxy group POSS modified metal surface pretreatment agent. Water serves as a solvent, silane serves as a main film forming agent, fluorozirconate and / or hexafluorozirconic acid serve / serves as a second film forming agent, 2,3-propylene oxide is added to replace cage type ONPS (epoxy group POSS) to serve as a film layer sealing agent and a mending agent, and acid, a metal accelerant, a rare earth compound and a stabilizer can be further included. According to the metal surface coating pretreatment agent, during film forming, silane film forming and fluorozirconate ceramic film forming are synchronously conducted, intermingling is conducted, a dense inorganic-organic hybrid film is formed, the silane can repair the defect in the fluorozirconate film forming process in time, and a film structure is optimized; and a plurality of epoxy groups of the epoxy group POSS and a plurality of position points in a film layer can act at the same time, the closing effect can be obviously improved, and the defect in the film layer can be better repaired and closed.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to an epoxy-based POSS-modified metal surface pretreatment agent and a preparation method and application thereof. Background technique [0002] Metal materials are damaged by the action of the surrounding medium, which is called metal corrosion. When metal corrodes, a chemical or electrochemical multiphase reaction occurs between the metal and air, water, etc. on the metal interface, causing the metal to enter an oxidized (ion) state, which will significantly reduce the mechanical properties of the metal material such as strength, plasticity, and toughness. , Destroy the geometric shape of metal components, increase the wear between parts, deteriorate the physical properties such as electrical and optical, and shorten the service life of the equipment. [0003] Application of coating protection on metal surfaces is the most common and important method of preventing metal cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/46
CPCC23C22/34C23C22/46C23C2222/20
Inventor 黄驰刘张洋文宇佳王光明高子茹李安然韩博廖俊
Owner WUHAN UNIV