A kind of nano compound polyurethane aeroplane dope and preparation method thereof
Technical field
The present invention relates to nanotechnology and corrosion protection technology, be specially a kind of nano compound polyurethane paint with high anti-corrosion and preparation method thereof.
Background technology
Aeroplane dope, for covering with paint and the protection of aircraft skin, is not only the decorative appearance material of aircraft, but also is the important materials that extends the aircraft utilization life-span, ensures the aircraft structure of safe flight.Department of CAAC once predicted, within 2011, domestic large aircraft C919 will welcome new order, the order of existing 100 at present, and following 20 years total sales volumes will reach 2000; Need all kinds of general and military aviation aircrafts to exceed 10,000 to China in 2012, newly make and keep in repair needed various aeroplane dope and will reach 5000 tons, high performance aeroplane dope is had to very large demand.Existing aeroplane dope, comprise nanometer aeroplane dope, decorating, aspect the performance such as anticorrosion, antifouling, self-cleaning property, uvioresistant, anti-salt fog, wet-heat resisting and low friction and work-ing life, there is wherein a part of effect, but can not reach over-all properties qualified; Particularly be generally 6-9 work-ing life.
Used aircraft coating is mainly made up of epoxy or polyurethane primer and polyurethane finish.The function of aviation priming paint is a lot of, wherein the most important thing is to prevent matrix corrosion.Moisture, oxygen, salt fog, acid mist and machine in atmospheric environment is the principal element that causes corrosion with liquid etc.Because common coating has certain rate of permeation for corrosive medium, it is inadequate therefore only depending on finish paint protection.The effect of priming paint is on the basis of bottom paint resin, and the compactness that strengthens priming paint by filler pigment is carried out the infiltration of slowing down corrosion medium, relies on the physics and chemistry effect of rust-stabilising pigment to stop material property to worsen.At present, the chromic salt such as strontium yellow, zinc chromate, baryta yellow are main rust-stabilising pigments in aircraft priming paint, and consumption is generally at the 10wt%-20wt% of priming paint total amount.As Chinese patent (publication number CN1891770) discloses aircraft skin coating, priming paint adopts intermediate molecular weight epoxy resin to arrange in pairs or groups mutually with more soft polyamide curing agent, finish paint adopts special hydroxy polyester resin and HDI biuret and HDI tripolymer as linking agent to arrange in pairs or groups mutually, contains the strontium chromate of 13wt%-14wt% in the base-material of priming paint.Chromic salt is poisonous, carcinogenic material, in Industrial processes, HUMAN HEALTH and environment is worked the mischief.The decree that restriction chromic salt uses is put into effect in all trades and professions successively, and the aeroplane dope of Devoting Major Efforts To Developing Chrome-free is inexorable trend.
Bicomponent polyurethane coating is due to energy ambient cure, and paint film has the advantages such as chemical proof, wear resistance, freeze-thaw resistance, good weatherability, has become the leading product of aeroplane dope.There is high performance polyurethanes aeroplane dope in the countries such as the U.S., Holland, Germany.Finch paint chemistry company, Steling spray paint company, U.S.'s paint company, Dutch AKZO company and all production and selling polyurethanes aeroplane dope of DESOTO company of Britain.In 1976, US Patent No. P3,989,676 have just reported that the polyepoxide-caprolactone polyol and the polymeric polyisocyanate that can be used for aircraft outside surface prepare polyurethane coating.US Patent No. P 4,110,317 has reported the polyurethane coating being made up of isocyanate-terminated prepolymer etc., can be used for weathering resistance and the erosion resistant protection of helicopter blade, radome etc.US Patent No. P4,155,896 have reported the conductive polyurethane coating that contains steel fiber that is applicable to aircraft structure, can carry out lightning protected or elimination static.But medium-sized aliphatic polyurethane top coat is main coat system, due to gloss retention and tint retention not enough, use the gloss of coating after two, three years constantly to decline, lost former glossy by about 5 years, be run ragged in appearance, also just lose commercial competitiveness [what tripod, Lei Junzhi, Hua Xinhao, aeroplane dope and application techniques, Chemical Industry Press, 2000, P175].On existing aliphatic polyurethane top coat, increase one deck ultraviolet light varnish, although gloss retention and tint retention improve, increased working procedure one, also increased man-hour and cost.
Summary of the invention
The object of this invention is to provide nano compound polyurethane aeroplane dope of a kind of high preservative property, high-durability, high didirtresistance, high surface self-cleaning, high anti-UV and long service life and preparation method thereof, solve in prior art aeroplane dope and adopt poisonous, harmful material, to problems such as HUMAN HEALTH and environment work the mischief.
Technical scheme of the present invention is:
A kind of nano compound polyurethane aeroplane dope, is made up of component one and component two, wherein:
(1) count by weight, component one is made up of following component and content:
Water based acrylic resin 60-80 part;
Nanometer slurry 5-10 part; Nanometer slurry is made up of nano titanium oxide, nano silicon, deionized water, silane coupling agent, cationic polyacrylamide dispersion agent and waterborne polyurethane resin, wherein: the weight ratio of nano titanium oxide, nano silicon, deionized water is (10~20): (40~50): (30~50), silane coupling agent account for above-mentioned nanoparticle gross weight 2~4%, polyacrylamide dispersion agent account for above-mentioned nanoparticle gross weight 3~5%, waterborne polyurethane resin accounts for 5~8% of above-mentioned nanoparticle gross weight;
Tinting pigment 1-3 part;
Organic inhibitor 8-10 part, organic inhibitor is the composition of lauroleate, cetylate, stearate and cinnamate;
Rust-stabilising pigment 10-15 part, rust-stabilising pigment is polyaniline modified micaceous iron oxide or polyaniline-modified glass flakes;
Filler 1-5 part;
Auxiliary agent 1-3 part;
Deionized water 20-30 part;
(2) count by weight, component two is made up of following component and content:
Water-based isocyanate solidifying agent 70-80 part;
Deionized water 20-30 part;
Component one and the weight proportion of component two are (100:10)~(100:30).
Described nano compound polyurethane aeroplane dope, lauroleate is one or both of sodium laurate, potassium laurate, cetylate is one or both of Sodium pentadecanecarboxylate, potassium palmitate, stearate is one or both of sodium stearate, potassium stearate, and cinnamate is one or both of Sodium.beta.-phenylacrylate, potassium cinnamate.
Described nano compound polyurethane aeroplane dope, the structure of polyaniline modified micaceous iron oxide is sheet structure, consists of: surface coating layer is polyaniline and phytic acid, and inside is iron mica; The thickness of coating layer is 10~20 μ m, and in coating layer, polyaniline and phytic acid are uniformly distributed, and polyaniline accounts for 80~90wt%, and phytic acid accounts for 10~20wt%.
Described nano compound polyurethane aeroplane dope, the structure of polyaniline-modified glass flakes, for being sheet structure, consists of: surface coating layer is polyaniline and phytic acid, and inside is glass flake; The thickness of coating layer is 10~30 μ m, and in coating layer, polyaniline and phytic acid are uniformly distributed, and polyaniline accounts for 80~90wt%, and phytic acid accounts for 10~20wt%.
The preparation method of described nano compound polyurethane aeroplane dope, as follows operation:
1) in container, add water based acrylic resin, deionized water, nanometer slurry, auxiliary agent, utilize high speed dispersor to disperse 5~10 minutes at 400~500rpm, add again tinting pigment, organic inhibitor, rust-stabilising pigment and filler, disperse 20~30 minutes through 500~1000rpm;
2) above-mentioned material is carried out to sand milling, the sand milling time is 1~4 hour, and after test fineness≤40 μ m, discharging, filters, and packaging, is prepared into component one;
3) water-based isocyanate solidifying agent is joined in stirring tank, add deionized water dilution, utilize high speed dispersor to disperse 5~20 minutes at 400~500rpm, discharging after filtering, packaging, is prepared into component two;
4) component two is added in component one, after stirring, spraying, brushing or dip-coating be at substrate surface, normal temperature or be heating and curing and form nano compound polyurethane aviation coating.
The preparation method of described nano compound polyurethane aeroplane dope, when rust-stabilising pigment is polyaniline modified micaceous iron oxide, the preparation method of polyaniline modified micaceous iron oxide is as follows:
(a) preparation phosphoric acid and phytic acid mixed aqueous solution: wherein, phosphoric acid is 0.01~5 mol/L, and phytic acid is 0.01~1 mol/L;
(b) aniline is joined in phosphoric acid and phytic acid mixed aqueous solution, mixed concentration of aniline is: 0.01~1 mol/L, continues to stir; Get phosphoric acid and phytic acid, aniline mixed aqueous solution 500ml, add 200~1000 order iron micas of 5~1000g, and after stirring, be pre-chilled to 0~10 DEG C;
(c) aqueous solution of preparation oxygenant: in solution, the concentration of oxygenant is 0.05~5 mol/L, and the aqueous solution of oxygenant is pre-chilled to 0~10 DEG C; Oxygenant is one or more mixture of ammonium persulphate, hydrogen peroxide, Potassium Persulphate, benzoyl peroxide;
(d) solution 500ml step (c) being made is in 10~30 minutes, to add in phosphoric acid that the 500ml step (b) that contains iron mica makes and phytic acid, aniline mixed aqueous solution in the time, 0~10 DEG C of reaction 1~8 hour, centrifugal, with distilled water wash, 80~100 DEG C dry after 1~5 hour, with mortar grinding, and sieve, obtain the iron mica of bottle-green 200~1000 order electrically conductive polyaniline modifications.
The preparation method of described nano compound polyurethane aeroplane dope, when rust-stabilising pigment is polyaniline-modified glass flakes, the preparation method of polyaniline-modified glass flakes is as follows:
(a) preparation phosphoric acid and phytic acid mixed aqueous solution: wherein phosphoric acid is 0.01~5 mol/L, and phytic acid is 0.01~1 mol/L;
(b) aniline is joined in phosphoric acid and phytic acid mixed aqueous solution, mixed concentration of aniline is: 0.01~1 mol/L, continue to stir, get phosphoric acid and phytic acid, aniline mixed aqueous solution 500ml, add the 80-1000 order glass flake of 5~1000g, and stir, be pre-chilled to 0~10 DEG C;
(c) aqueous solution of preparation oxygenant: in solution, the concentration of oxygenant is 0.05~5 mol/L, and the aqueous solution of oxygenant is pre-chilled to 0~10 DEG C; Oxygenant is one or more mixture of ammonium persulphate, hydrogen peroxide, Potassium Persulphate, benzoyl peroxide, iron trichloride, potassium bichromate, potassium permanganate;
(d) solution 500ml step (c) being made is in 10~30 minutes, to add in the 500ml phosphoric acid that contains glass flake that step (b) makes and phytic acid, aniline mixed aqueous solution in the time, 0~10 DEG C of reaction 1~8 hour, centrifugal, with distilled water wash, 80~100 DEG C dry after 1~5 hour, with mortar grinding, and sieve, obtain the glass flake of bottle-green 80~1000 order electrically conductive polyaniline processing.
The preparation method of described nano compound polyurethane aeroplane dope, the preparation method of nanometer slurry is as follows:
Nano titanium oxide and nano silicon are added in deionized water, carry out ultrasonic wave and disperse 20~30 minutes, temperature T=30~40 DEG C; Add respectively therein again silane coupling agent, cationic polyacrylamide dispersion agent and waterborne polyurethane resin to carry out ultrasonic wave and disperse 1~2 hour, temperature T=50~60 DEG C; Finally in (1~3) × 10
4, each centrifugal 0.5~2 hour, make nanometer slurry under rev/min centrifugal for 2~3 times.
Design philosophy of the present invention is:
(1) nanometer slurry
Nanometer slurry is evenly mixed by nano titanium oxide, nano silicon, water, silane coupling agent, cationic polyacrylamide dispersion agent, waterborne polyurethane resin, by properties-correcting agent such as silane coupling agent, cationic polyacrylamide dispersion agent, waterborne polyurethane resins to nano particle surface modifying, to improve its consistency, and compatible with selected coating system.Wherein:
Cationic polyacrylamide dispersion agent (PAM) is chain macromolecule compound, because it has multiple active group, and can, absorption formation hydrogen bond affine with many materials.Owing to containing carboxyl in PAM molecular chain, there is the capillary effect of reduction, contribute to moistening to solid of water, this for nanoparticle the dispersion in water advantageous particularly, in the time that PAM adds slurry, can make nanoparticle surface form bimolecular structure, extreme and the water of outer dispersion agent has stronger avidity, increased nanoparticle by the degree of water-wet, between solid particulate because of electrostatic repulsion away from, reach good dispersion effect.
Silane coupling agent is as binding agent and surface treatment agent, and silane coupling agent can improve the bond properties of waterborne polyurethane resin, is that as the action principle of tackifier itself has two kinds of groups: a kind of group can with the framework material combination of being glued; Another kind of group can be combined with cationic polyacrylamide dispersion agent or waterborne polyurethane resin, thereby forms powerful higher chemical bond at bonding interface, has greatly improved bonding strength.
Waterborne polyurethane resin is mainly used in promoting the adherence of nanometer slurry, has the ultra-fine film that causes and extend, excellent winter hardiness, but can excessively not fill grain.
(2) organic inhibitor
Organic inhibitor is the composition of lauroleate, cetylate, stearate and cinnamate, wherein:
The sodium laurate of clean-out system, sterilant and pharmaceutical industry and potassium laurate are used for to organic inhibitor, there is high preservative property, high-durability, and environment-protecting asepsis are harmless.
The Sodium pentadecanecarboxylate of pharmaceutical industry and potassium palmitate are used for to organic inhibitor, there is high didirtresistance, high surface self-cleaning, high anti-UV, and environment-protecting asepsis are harmless.
The sodium stearate of metal heat treatmet and stabilizer for plastics and potassium stearate are used for to organic inhibitor, there is the effect that improves coating activity, floating voltinism and stability, and environment-protecting asepsis are harmless.
The Sodium.beta.-phenylacrylate of pharmaceutical industry, potassium cinnamate, for organic inhibitor, have the effect of sterilization and anticorrosion and antioxygen, and environment-protecting asepsis are harmless.
(3) rust-stabilising pigment
Rust-stabilising pigment is polyaniline modified micaceous iron oxide or polyaniline-modified glass flakes, wherein:
Polyaniline modified micaceous iron oxide can be realized passivation and the inhibition of metal base, solidity to corrosion and the permeability resistance of conventional MIO coating are improved, can replace the leaded and chromate pigments in conventional MIO coating, prepared coating meets the not environmental requirement containing harmful pigment.Utilize oxidative polymerization method to form the coating layer of polyaniline and phytic acid on iron mica surface, iron mica after treatment has passivation and corrosion inhibition to metal.
Polyaniline-modified glass flakes can be realized passivation and the inhibition of metal base, has improved solidity to corrosion and the permeability resistance of conventional glass-flake coating.Utilize oxidative polymerization method to form polyaniline-coated layer on glass flake surface, glass flake after treatment has passivation to metal, and the phytic acid coating layer on glass flake surface also plays the effect of inhibition to metal.
In the present invention, organic inhibitor and rust-stabilising pigment match, and rust-stabilising pigment can form protective membrane in coating and metal interface after stripping in water, plays corrosion-resisting function.Sudden strain of a muscle rust when organic inhibitor can resist due to coating application occurs, and has used collaborative corrosion-resisting function together with rust-stabilising pigment.
In the present invention, tinting pigment is coating common pigments, as: titanium dioxide, zinc oxide or lithopone etc.
In the present invention, filler is coating customary filler, as: GL ground limestone, precipitated calcium carbonate, talcum powder or quartz sand etc.
In the present invention, auxiliary agent is the auxiliary agent often using in coating preparation process, comprises anti-settling agent, wetting dispersing agent or flow agent etc.
Advantage of the present invention and beneficial effect are as follows:
1, the organic inhibitor of nano compound polyurethane aeroplane dope of the present invention is the composition of lauroleate, cetylate, stearate and cinnamate, has the features such as high preservative property, high-durability, high didirtresistance, high surface self-cleaning, high anti-UV and long service life.
2, nano compound polyurethane aeroplane dope employing rust-stabilising pigment of the present invention is polyaniline modified micaceous iron oxide or polyaniline-modified glass flakes, and rust-stabilising pigment used is nontoxic, is conducive to environmental protection.
3, nano compound polyurethane aeroplane dope of the present invention due to adopt composite nano slurry, rust-stabilising pigment, compound organic inhibitor and water compound use form waterbased urethane aeroplane dope by, the permeability resistance of coating, erosion resistance are significantly improved.
4, nano compound polyurethane aeroplane dope of the present invention has excellent storage stability, the feature such as is difficult for sinking to the bottom.
5, nano compound polyurethane aeroplane dope of the present invention have to substrate surface treatment require low, with metal base bonding force strong, the advantage that shelf-stable matching capacity is good, antiseptic property is good.
Embodiment
Unless outside specializing in the present invention, related ratio is weight ratio.
Preparation method of sample: some 150mm × 75mm × 2mm LY12 aluminium alloy plate surface is after oil removal treatment, spraying twice coating (build be 40 ± 5 μ m), coating adopts respectively the polyurethane coating of nano compound polyurethane aeroplane dope, contrast, after Air drying 7 days, carry out coating performance test.
Performance evaluation: the neutral salt spray test of coating sample adopts the ST-ISO-3 salt mist tester of Japanese Xu He trier Co., Ltd..NaCl strength of solution is 3.5wt%, and test temperature is 40 ± 2 DEG C, sprays continuously 1500 hours, and neutral salt spray test operative norm GB1771-79, according to GB1740-79 evaluation coating salt fog resistance grade.
Below, by embodiment, the present invention is described in more detail.
Embodiment 1
1, the preparation of nanometer slurry
Be 15:45:40 by the weight ratio of nano titanium oxide, nano silicon, water, add deionized water for ultrasonic ripple (temperature T=40 DEG C) to disperse 20min nano titanium oxide and nano silicon; Add therein again account for above-mentioned nanoparticle gross weight 3% silane coupling agent, account for the polyacrylamide dispersion agent of above-mentioned nanoparticle gross weight 4% and account for the waterborne polyurethane resin of above-mentioned nanoparticle gross weight 6%, carry out ultrasonic wave (T=55 DEG C) and disperse 1h; Finally 2 × 10
4under rev/min centrifugal 3 times, each centrifugal 1h, makes nanometer slurry.
2, the preparation of polyaniline modified micaceous iron oxide
(a) preparation phosphoric acid and phytic acid mixed aqueous solution: wherein phosphoric acid is 1.5 mol/L; Phytic acid is 0.5 mol/L.
(b) aniline is joined in phosphoric acid and phytic acid mixed aqueous solution, mixed concentration of aniline is: 0.5 mol/L.Continue to stir 0.5 hour.Get phosphoric acid and phytic acid, aniline mixed aqueous solution 500ml, add the 325 order iron micas of 70g, and stir after 10 minutes, be pre-chilled to 8 DEG C.
(c) aqueous solution of preparation oxygenant: select benzoyl peroxide as oxygenant, the concentration of preparation benzoyl peroxide is 1.5 mol/L.The aqueous solution of benzoyl peroxide is pre-chilled to 8 DEG C.
(d) (c) 500ml solution was slowly added in 10~30 minutes in the 500ml phosphoric acid that contains iron mica and phytic acid, aniline mixed aqueous solution (b), 5 DEG C of reactions 3 hours, centrifugal, with distilled water wash, 90 DEG C dry after 2 hours, with mortar grinding, after screening, obtain the iron mica of bottle-green 325 order electrically conductive polyaniline modifications.The structure of the polyaniline modified micaceous iron oxide obtaining is sheet structure, consists of: surface coating layer is polyaniline and phytic acid, and inside is iron mica; The coating thickness of the present embodiment is 20 μ m, and in coating layer, polyaniline and phytic acid are uniformly distributed, and polyaniline accounts for 80wt%, and phytic acid accounts for 20wt%.
3, the preparation of component one
In dispersion cylinder, add 70kg water based acrylic resin, add deionized water 25kg, then add above-mentioned nanometer slurry 8kg, add again BYK-P104S wetting dispersing agent 0.8kg, BYK-310 flow agent 0.2kg, BENTONE34 organobentonite anti-settling agent (RHEOX company of the U.S.) 0.5kg, utilize high speed dispersor to disperse 10 minutes at 400rpm, add again titanium dioxide 2kg, above-mentioned polyaniline modified micaceous iron oxide 12kg, sodium laurate 2kg, Sodium pentadecanecarboxylate 2kg, sodium stearate 2kg, Sodium.beta.-phenylacrylate 2kg, talcum powder 3kg, with high speed dispersor 500rpm dispersion 20 minutes, then grind 2 hours with horizontal sand mill, after being 25 microns to fineness, filter, pack, be prepared into the component one of nano compound polyurethane aeroplane dope.
4, the preparation of component two
Water-based isocyanate solidifying agent is mixed to add by weight 80:20 with deionized water and disperse in cylinder, use high speed dispersor 500rpm to disperse after 10 minutes, to filter, pack.
Two components are by component one: component two=5:1 (weight ratio) proportioning is made nano compound polyurethane aeroplane dope after stirring.On the LY12 of 75mm × 150mm × 2mm aluminium alloy, spray this nano compound polyurethane aeroplane dope, under normal temperature, be dried 7 days, build is 40 ± 5 μ m.
Embodiment 2
1, the preparation of nanometer slurry
Be 10:50:40 by the weight ratio of nano titanium oxide, nano silicon, water, add deionized water for ultrasonic ripple (temperature T=30 DEG C) to disperse 30min nano titanium oxide and nano silicon; Add therein again account for above-mentioned nanoparticle gross weight 2% silane coupling agent, account for the polyacrylamide dispersion agent of above-mentioned nanoparticle gross weight 5% and account for the waterborne polyurethane resin of above-mentioned nanoparticle gross weight 8%, carry out ultrasonic wave (T=50 DEG C) and disperse 2h; Finally 1 × 10
4under rev/min centrifugal 2 times, each centrifugal 2h, makes nanometer slurry.
2, the preparation of polyaniline modified micaceous iron oxide
(a) preparation phosphoric acid and phytic acid mixed aqueous solution: wherein phosphoric acid is 0.5 mol/L; Phytic acid is 0.1 mol/L.
(b) aniline is joined in phosphoric acid and phytic acid mixed aqueous solution, mixed concentration of aniline is: 0.1 mol/L.Continue to stir 1.5 hours.Get phosphoric acid and phytic acid, aniline mixed aqueous solution 500ml, add the 325 order iron micas of 20g, and stir after 25 minutes, be pre-chilled to 2 DEG C.
(c) aqueous solution of preparation oxygenant: select ammonium persulphate as oxygenant, the concentration of preparation ammonium persulphate is 0.5 mol/L.The aqueous solution of ammonium persulphate is pre-chilled to 2 DEG C.
(d) (c) 500ml solution was slowly added in 10~30 minutes in the 500ml phosphoric acid that contains iron mica and phytic acid, aniline mixed aqueous solution (b), 2 DEG C of reactions 1 hour, centrifugal, with distilled water wash, 80 DEG C dry after 5 hours, with mortar grinding, after screening, obtain the iron mica of bottle-green 325 order electrically conductive polyaniline modifications.The structure of the polyaniline modified micaceous iron oxide obtaining is sheet structure, consists of: surface coating layer is polyaniline and phytic acid, and inside is iron mica; The coating thickness of the present embodiment is 10 μ m, and in coating layer, polyaniline and phytic acid are uniformly distributed, and polyaniline accounts for 90wt%, and phytic acid accounts for 10wt%.
3, the preparation of component one
In dispersion cylinder, add 75kg water based acrylic resin, add deionized water 23kg, then add above-mentioned nanometer slurry 6kg, add again BYK-P104S wetting dispersing agent 0.5kg, BYK-310 flow agent 0.5kg, BENTONE34 organobentonite anti-settling agent (RHEOX company of the U.S.) 1.0kg, utilize high speed dispersor to disperse 5 minutes at 500rpm, add again titanium dioxide 2.5kg, above-mentioned polyaniline modified micaceous iron oxide 13kg, sodium laurate 2.5kg, Sodium pentadecanecarboxylate 2kg, sodium stearate 2.5kg, Sodium.beta.-phenylacrylate 2kg, talcum powder 4kg, with high speed dispersor 800rpm dispersion 25 minutes, then grind 3 hours with horizontal sand mill, after being 25 microns to fineness, filter, pack, be prepared into the component one of nano compound polyurethane aeroplane dope.
4, the preparation of component two
Water-based isocyanate solidifying agent is mixed to add by weight 70:30 with deionized water and disperse in cylinder, use high speed dispersor 400rpm to disperse after 20 minutes, to filter, pack.
Two components are by component one: component two=10:1 (weight ratio) proportioning is made nano compound polyurethane aeroplane dope after stirring.On the LY12 of 75mm × 150mm × 2mm aluminium alloy, spray this nano compound polyurethane aeroplane dope, under normal temperature, be dried 7 days, build is 40 ± 5 μ m.
Embodiment 3
1, the preparation of nanometer slurry
Be 20:45:35 by the weight ratio of nano titanium oxide, nano silicon, water, add deionized water for ultrasonic ripple (temperature T=35 DEG C) to disperse 25min nano titanium oxide and nano silicon; Add therein again account for above-mentioned nanoparticle gross weight 4% silane coupling agent, account for the polyacrylamide dispersion agent of above-mentioned nanoparticle gross weight 3% and account for the waterborne polyurethane resin of above-mentioned nanoparticle gross weight 5%, carry out ultrasonic wave (T=60 DEG C) and disperse 1.5h; Finally 3 × 10
4under rev/min centrifugal 3 times, each centrifugal 0.5h, makes nanometer slurry.
2, the preparation of polyaniline-modified glass flakes
(a) preparation phosphoric acid and phytic acid mixed aqueous solution: wherein phosphoric acid is 1.2 mol/L; Phytic acid is 0.6 mol/L.
(b) aniline is joined in phosphoric acid and phytic acid mixed aqueous solution, mixed concentration of aniline is: 0.5 mol/L.Continue to stir 1.5 hours.Get phosphoric acid and phytic acid, aniline mixed aqueous solution 500ml, add the 240 order glass flakes of 500g, and stir 30 minutes, be pre-chilled to 8 DEG C.
(c) aqueous solution of preparation oxygenant: select benzoyl peroxide as oxygenant, the concentration of preparation benzoyl peroxide is 1.2 mol/L.The aqueous solution of benzoyl peroxide is pre-chilled to 8 DEG C.
(d) (c) 500ml solution was slowly added in 10~30 minutes in the 500ml acid that contains glass flake and phytic acid, aniline mixed aqueous solution (b), 5 DEG C of reactions 3 hours, centrifugal, with distilled water wash, 80 DEG C dry after 3 hours, with mortar grinding, after screening, obtain the glass flake of bottle-green 240 order electrically conductive polyaniline modifications.In the present embodiment, the structure of the polyaniline-modified glass flakes obtaining is sheet structure, consists of: surface coating layer is polyaniline and phytic acid, and inside is glass flake; The coating thickness of the present embodiment is 30 μ m, and in coating layer, polyaniline and phytic acid are uniformly distributed, and polyaniline accounts for 80wt%, and phytic acid accounts for 20wt%.
3, the preparation of component one
In dispersion cylinder, add 60kg water based acrylic resin, add deionized water 20kg, then add above-mentioned nanometer slurry 5kg, add again BYK-P104S wetting dispersing agent 0.2kg, BYK-310 flow agent 0.3kg, BENTONE34 organobentonite anti-settling agent (RHEOX company of the U.S.) 0.5kg, utilize high speed dispersor to disperse 8 minutes at 450rpm, add again titanium dioxide 1kg, above-mentioned polyaniline-modified glass flakes 10kg, potassium laurate 2kg, potassium palmitate 2.5kg, potassium stearate 2kg, potassium cinnamate 2.5kg, talcum powder 1kg, with high speed dispersor 900rpm dispersion 20 minutes, then grind 1 hour with horizontal sand mill, after being 25 microns to fineness, filter, pack, be prepared into the component one of nano compound polyurethane aeroplane dope.
4, the preparation of component two
Water-based isocyanate solidifying agent is mixed to add by weight 75:25 with deionized water and disperse in cylinder, use high speed dispersor 500rpm to disperse after 5 minutes, to filter, pack.
Two components are by component one: component two=10:3 (weight ratio) proportioning is made nano compound polyurethane aeroplane dope after stirring.On the LY12 of 75mm × 150mm × 2mm aluminium alloy, spray this nano compound polyurethane aeroplane dope, under normal temperature, be dried 7 days, build is 40 ± 5 μ m.
Embodiment 4
1, the preparation of nanometer slurry
Be 20:45:35 by the weight ratio of nano titanium oxide, nano silicon, water, add deionized water for ultrasonic ripple (temperature T=35 DEG C) to disperse 25min nano titanium oxide and nano silicon; Add therein again account for above-mentioned nanoparticle gross weight 4% silane coupling agent, account for the polyacrylamide dispersion agent of above-mentioned nanoparticle gross weight 3% and account for the waterborne polyurethane resin of above-mentioned nanoparticle gross weight 5%, carry out ultrasonic wave (T=60 DEG C) and disperse 1.5h; Finally 3 × 10
4under rev/min centrifugal 3 times, each centrifugal 0.5h, makes nanometer slurry.
2, the preparation of polyaniline-modified glass flakes
(a) preparation phosphoric acid and phytic acid mixed aqueous solution: wherein phosphoric acid is 0.4 mol/L; Phytic acid is 0.1 mol/L.
(b) aniline is joined in phosphoric acid and phytic acid mixed aqueous solution, mixed concentration of aniline is: 0.1 mol/L.Continue to stir 1 hour.Get phosphoric acid and phytic acid, aniline mixed aqueous solution 500ml, add the 325 order glass flakes of 200g, and stir 20 minutes, be pre-chilled to 2 DEG C.
(c) aqueous solution of preparation oxygenant: select ammonium persulphate as oxygenant, the concentration of preparation ammonium persulphate is 0.5 mol/L.The aqueous solution of ammonium persulphate is pre-chilled to 2 DEG C.
(d) (c) 500ml solution was slowly added in 20 minutes in the 500ml acid that contains glass flake and phytic acid, aniline mixed aqueous solution (b), 2 DEG C of reactions 1 hour, centrifugal, with distilled water wash, 100 DEG C dry after 1 hour, with mortar grinding, after screening, obtain the glass flake of bottle-green 325 order electrically conductive polyaniline modifications.In the present embodiment, the structure of the polyaniline-modified glass flakes obtaining is sheet structure, consists of: surface coating layer is polyaniline and phytic acid, and inside is glass flake; The coating thickness of the present embodiment is 15 μ m, and polyaniline and phytic acid are uniformly distributed, and polyaniline accounts for 90wt%, and phytic acid accounts for 10wt%.
3, the preparation of component one
In dispersion cylinder, add 80kg water based acrylic resin, add deionized water 30kg, then add above-mentioned nanometer slurry 10kg, add again BYK-P104S wetting dispersing agent 1.0kg, BYK-310 flow agent 0.5kg, BENTONE34 organobentonite anti-settling agent (RHEOX company of the U.S.) 0.5kg, utilize high speed dispersor to disperse 5 minutes at 500rpm, add again titanium dioxide 3kg, above-mentioned polyaniline-modified glass flakes 15kg, potassium laurate 2kg, potassium palmitate 2kg, potassium stearate 2kg, potassium cinnamate 2kg, talcum powder 5kg, with high speed dispersor 1000rpm dispersion 20 minutes, then grind 4 hours with horizontal sand mill, after being 25 microns to fineness, filter, pack, be prepared into the component one of nano compound polyurethane aeroplane dope.
4, the preparation of component two
Water-based isocyanate solidifying agent is mixed to add by weight 80:20 with deionized water and disperse in cylinder, use high speed dispersor 400rpm to disperse after 15 minutes, to filter, pack.
Two components are by component one: component two=4:1 (weight ratio) proportioning is made nano compound polyurethane aeroplane dope after stirring.On the LY12 of 75mm × 150mm × 2mm aluminium alloy, spray this nano compound polyurethane aeroplane dope, under normal temperature, be dried 7 days, build is 40 ± 5 μ m.
Comparative example 1
The preparation method of component one: add 40kg Hydroxylated acrylic resin in dispersion cylinder
(solid content is 65wt% to A265, the hydroxy radical content of solid resin is 3.4wt%), add dimethylbenzene 19kg, then add BYK-P104S wetting dispersing agent 0.8kg, BYK-310 flow agent 0.2kg, BENTONE34 organobentonite anti-settling agent (RHEOX company of the U.S.) 0.5kg, utilize high speed dispersor to disperse 10 minutes at 400rpm, add again titanium dioxide 16kg, talcum powder 23.5kg, with high speed dispersor 500rpm dispersion 20 minutes, then grind 2 hours with horizontal sand mill, after being 25 microns to fineness, filter, packaging, prepare the component one of polyurethane coating.
The preparation method of component two: solidifying agent 80kg
n75 (solid content is 75wt%, and NCO content is 16.5wt%) adds and disperses in cylinder, then adds 20kg N-BUTYL ACETATE, uses high speed dispersor 500rpm to disperse after 15 minutes, to filter, pack.
Two components are by component one: component two=5:1 (weight ratio) proportioning is made polyurethane coating after stirring.On the LY12 of 75mm × 150mm × 2mm aluminium alloy, spray this polyurethane coating, under normal temperature, be dried 7 days, build is 40 ± 5 μ m.
Neutral salt spray test the results are shown in Table 1.The salt spray resistance of the coating sample that as can be seen from Table 1, prepared by embodiment 1~4 use nano compound polyurethane aeroplane dope is obviously better than the conventional polyurethanes coating sample that there is no nanometer slurry, organic inhibitor, rust-stabilising pigment of comparative example 1.In addition, from embodiment, compared with corresponding comparative example, corrosion extension width in cut place obviously narrows, and shows that urethane aeroplane dope has significantly increased the solidity to corrosion of coating.
Table 1
? |
Salt fog resistance (level) |
Cut place corrosion expansion maximum width, mm |
Embodiment 1 |
1 |
0.4 |
Embodiment 2 |
0 |
0.6 |
Embodiment 3 |
1 |
0.5 |
Embodiment 4 |
0 |
0.5 |
Comparative example 1 |
2 |
2.8 |
Embodiment result shows, the present invention proposes to adopt Novel composite nano slurry, rust-stabilising pigment, compound organic inhibitor and water etc. to prepare nano compound polyurethane aeroplane dope, makes nano-powder material stably dispersing in coating, and has improved the solidity to corrosion of coating.Owing to using Chrome-free rust-stabilising pigment, the coating of preparation is conducive to environment protection.In addition, this coating consistency is good, stable chemical performance, and excellent storage stability, is difficult for sinking to the bottom.