CN105331266A - Aluminium section coating pretreatment agent - Google Patents

Abstract

The invention discloses an aluminium section coating pretreatment agent. The aluminium section coating pretreatment agent is prepared from, by weight, 0.5 to 1 part of benzotriazole, 5 to 6 parts of cerous nitrate, 1 to 2 parts of sodium fluoride, 1.5 to 2 parts of hydrogen peroxide, 20 to 24 parts of triethoxyvinylsilane, 1 to 2 parts of polyvinyl alcohol, 1 to 2 parts of nano titanium dioxide, 2 to 3 parts of nano zirconium dioxide, 5 to 6 parts of aqueous polyurethane, 0.5 to 1 part of sodium of polyaspartic acid, 2 to 3 parts of tartaric acid, 0.4 to 0.6 part of Arabic gum, 0.8 to 1 part of barite powder, 2 to 2.4 parts of diatomite, 0.2 to 0.4 part of calcium oxide, and 100 to 130 parts of deionized water. The aluminium section coating pretreatment agent is capable of preventing redeposition of dirt, and removing surface dust, improving flatness and glossiness of matrix metal, has excellent adhesive force, can be applied to industrial production, and has excellent social benefit and economic benefit.

Description

A kind of coatings of the aluminium profiles pretreating reagent

Technical field

The present invention relates to technical field of surface, particularly relate to a kind of coatings of the aluminium profiles pretreating reagent.

Background technology

Aluminium is one of non-ferrous metal that usage quantity is large, range of application is the widest.It has light weight, mechanical property is high, heat-conductivity conducting performance is good, the feature such as anti-corrosion in an atmosphere, is widely used in the fields such as oil, aviation and light industry.Because the Nature comparison of aluminium is active, the pellumina making its surface form one deck densification is increased temperature in moulding process China and foreign countries, aluminium alloy extrusions can be infected with a lot of greasy dirt in transport and preservation process simultaneously, the pollutents such as dust, but the existence of oxide film and greasy dirt can hinder combination good between thawing metal, formation is mingled with, moisture damage metallic continuity in simultaneously stability air and homogeneity, thus produce pore at weld, affect the resistance to air loss of heat-exchange equipment, traditional alkalescence cleaning is while removal surface alumina oxide film, " dust " is formed at sample surfaces, finally need " bright dipping " process in acid solution, commercial run is complicated and cost is high, inapplicable modern industrialization is produced.Silane coupling agent, not only containing the siloxanes that can be hydrolyzed but also containing the organo-functional group that can be combined with other materials, has unique constitutional features, is used as binding agent, sealing agent and surface treatment agent at first.From the nineties in 20th century, just there is people that it is used in protecting metallic surface aspect, find that silane coupling agent has good metal protection effect, but silane super hydrophobic film even compact, effectively can stop the invasion of corrosive medium, but this type of rete weather resistance is poor, once suffer that destroying whole rete can lose efficacy rapidly, it is high that rare-earth conversion coatings has bonding strength as cathodic corrosion inhibitor, the advantages such as resistance to persistence is good, but easily crack, affect corrosion resisting property, the present invention adopts rare earth and siloxanes composite membrane to realize the complementation of advantage, corrosion prevention for aluminium provides effective and the processing method of high-efficiency environment friendly.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides a kind of coatings of the aluminium profiles pretreating reagent.

The present invention is achieved by the following technical solutions:

A kind of coatings of the aluminium profiles pretreating reagent, is made up of the raw material of following weight part: benzotriazole 0.5-1, cerous nitrate 5-6, Sodium Fluoride 1-2, hydrogen peroxide 1.5-2, vinyl three ethoxy silane 20-24, polyvinyl alcohol 1-2, nano titanium oxide 1-2, nano zirconium dioxide 2-3, aqueous polyurethane 5-6, poly (sodium aspartate) 0.5-1, tartrate 2-3, gum arabic 0.4-0.6, ground barium sulfate 0.8-1, diatomite 2-2.4, calcium oxide 0.2-0.4, deionized water 100-130.

Described a kind of coatings of the aluminium profiles pretreating reagent, be made up of following concrete steps:

(1) vinyl three ethoxy silane, deionized water and dehydrated alcohol are mixed according to volume ratio 5:5:90, then instill acetic acid adjustment pH value to 6.5, at room temperature stir hydrolysis 48h for subsequent use;

(2) by polyvinyl alcohol with adding nano titanium oxide and nano zirconium dioxide ultrasonic disperse 15-20min after 5 times amount deionized water dissolvings, be added in vinyl three ethoxy hydrolyzed silane solution afterwards, at room temperature constantly stir for subsequent use;

(3) the water dilution of diatomite and gum arabic total amount 10-13 times amount stirred, add calcium oxide and ground barium sulfate stirring 6-8min when being heated to 50-55 ° of C, then cooling is added to rapid stirring 0.5-1h in aqueous polyurethane (solid content is 15%);

(4) by the remaining deionized water dissolving of benzotriazole, cerous nitrate and Sodium Fluoride, then stir after adding hydrogen peroxide, then add step (2), product prepared by step (3) and remaining surplus materials thereof, can obtain after being uniformly mixed.

Advantage of the present invention is: the present invention adopts silane hydrolysis reaction to generate silanol, its terminal functional group is connected with rare earth cerous nitrate, form reticulated structure rete, this rete has good stripping strength, compactness, bonding strength is high, not easily produce microgroove, and add the super-hydrophobicity that nano titanium oxide and nano zirconium dioxide improve film, barrier property, solidity to corrosion, the modified oxidized calcium added and ground barium sulfate wipe oil, the effect of oxide film, protection matrix metal reduces corrosive wear, the effect of fining metal surface crystallization tissue, aluminium section bar treatment agent prepared by the present invention has and prevents redeposition of soil, the effect of surface ash disposal, make the planeness of matrix metal, glossiness improves, there is good sticking power, the present invention is applied to industrial production, there is good Social benefit and economic benefit.

Embodiment

A kind of coatings of the aluminium profiles pretreating reagent, is made up of the raw material of following weight part (kilogram): benzotriazole 0.5, cerous nitrate 5, Sodium Fluoride 1, hydrogen peroxide 1.5, vinyl three ethoxy silane 20, polyvinyl alcohol 1, nano titanium oxide 1, nano zirconium dioxide 2, aqueous polyurethane 5, poly (sodium aspartate) 0.5, tartrate 2, gum arabic 0.4, ground barium sulfate 0.8, diatomite 2, calcium oxide 0.2, deionized water 100.

Described a kind of coatings of the aluminium profiles pretreating reagent, be made up of following concrete steps:

(1) vinyl three ethoxy silane, deionized water and dehydrated alcohol are mixed according to volume ratio 5:5:90, then instill acetic acid adjustment pH value to 6.5, at room temperature stir hydrolysis 48h for subsequent use;

(2) by polyvinyl alcohol with adding nano titanium oxide and nano zirconium dioxide ultrasonic disperse 15min after 5 times amount deionized water dissolvings, be added in vinyl three ethoxy hydrolyzed silane solution afterwards, at room temperature constantly stir for subsequent use;

(3) the water dilution of diatomite and gum arabic total amount 10 times amount stirred, add calcium oxide and ground barium sulfate stirring 6min when being heated to 50 ° of C, then cooling is added to rapid stirring 0.5h in aqueous polyurethane (solid content is 15%);

(4) by the remaining deionized water dissolving of benzotriazole, cerous nitrate and Sodium Fluoride, then stir after adding hydrogen peroxide, then add step (2), product prepared by step (3) and remaining surplus materials thereof, can obtain after being uniformly mixed.

The treatment solution process aluminum alloy plate materials prepared according to embodiment is tested, and tests in its surface sprinkling, and salt tolerance is tested: this sheet material being immersed in concentration is in the sodium chloride solution of 5%, soak 300 hours, material surface is substantially unchanged, soaks 300 hours, occurs without rust staining; Acid resisting test: the 0.05mol/l sulfuric acid being 23 DEG C by this sheet material temperature carries out spray experiment, experimental period 20 hours, and clean with clear water, indoor placement 2 hours, coating surface was unchanged, comes off, without damaged without foaming, nothing; Stripper-resistance is tested: the paste this plate surface being coated with last layer 2-3mm, and being put into temperature is 50 ° of C, and relative humidity is in the watertight chest of 90-96%, experimental period 24 hours, cleans after taking-up with clear water, and coating surface comes off, without damaged without foaming, nothing.

Claims (2)

1. a coatings of the aluminium profiles pretreating reagent, it is characterized in that, be made up of the raw material of following weight part: benzotriazole 0.5-1, cerous nitrate 5-6, Sodium Fluoride 1-2, hydrogen peroxide 1.5-2, vinyl three ethoxy silane 20-24, polyvinyl alcohol 1-2, nano titanium oxide 1-2, nano zirconium dioxide 2-3, aqueous polyurethane 5-6, poly (sodium aspartate) 0.5-1, tartrate 2-3, gum arabic 0.4-0.6, ground barium sulfate 0.8-1, diatomite 2-2.4, calcium oxide 0.2-0.4, deionized water 100-130.

2. a kind of coatings of the aluminium profiles pretreating reagent according to claim 1, is characterized in that, be made up of following concrete steps:

(1) vinyl three ethoxy silane, deionized water and dehydrated alcohol are mixed according to volume ratio 5:5:90, then instill acetic acid adjustment pH value to 6.5, at room temperature stir hydrolysis 48h for subsequent use;

(2) by polyvinyl alcohol with adding nano titanium oxide and nano zirconium dioxide ultrasonic disperse 15-20min after 5 times amount deionized water dissolvings, be added in vinyl three ethoxy hydrolyzed silane solution afterwards, at room temperature constantly stir for subsequent use;

(3) the water dilution of diatomite and gum arabic total amount 10-13 times amount stirred, add calcium oxide and ground barium sulfate stirring 6-8min when being heated to 50-55 ° of C, then cooling is added to rapid stirring 0.5-1h in aqueous polyurethane (solid content is 15%);

(4) by the remaining deionized water dissolving of benzotriazole, cerous nitrate and Sodium Fluoride, then stir after adding hydrogen peroxide, then add step (2), product prepared by step (3) and remaining surplus materials thereof, can obtain after being uniformly mixed.