CN113234381B - Ultra-thin aluminum profile - Google Patents
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- CN113234381B CN113234381B CN202110407654.6A CN202110407654A CN113234381B CN 113234381 B CN113234381 B CN 113234381B CN 202110407654 A CN202110407654 A CN 202110407654A CN 113234381 B CN113234381 B CN 113234381B
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- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
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- B05D2202/00—Metallic substrate
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Abstract
The invention belongs to the technical field of aluminum material preparation and processing, and particularly relates to an ultrathin aluminum profile. The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components: nano SiO 2 Granular, nano TiO 2 Particles, nano-scale natural silica-alumina clay and nano-scale adsorption materials. The aluminum profile coating provided by the invention has excellent stain resistance, sterilization, corrosion resistance and wear resistance, has good bonding strength with an aluminum alloy substrate, plays a long-acting protection role, can prolong the service life of the aluminum alloy and expand the application field of the aluminum alloy.
Description
Technical Field
The invention belongs to the technical field of aluminum material preparation and processing, and particularly relates to an ultrathin aluminum profile.
Background
Aluminum is a light metal, the compound of which is very widely distributed in nature, and the content of aluminum in the earth's crust is about 8%, which is second only to oxygen and silicon, and third. The metal species, second only to steel, is the second largest metal. Aluminum has special chemical and physical properties, is one of the most common industrial metals at present, has light weight and firm texture, and has good ductility, electrical conductivity, thermal conductivity, heat resistance and nuclear radiation resistance, and is an important basic raw material for national economic development.
Aluminum has a specific gravity of 2.7 and a density of about 1/3 for common metals. Whereas the conductivity of a conventional aluminum wire is about 61% of copper and the thermal conductivity is half of that of silver. Pure aluminum, while extremely soft and ductile, can be reliably cold worked and alloyed to harden it. Aluminum and aluminum alloy are one of the most widely used materials in nonferrous metals, and the aluminum alloy has a plurality of excellent properties such as low density, easy processing, low thermal expansion coefficient, high thermal conductivity, high specific stiffness and specific strength, and the like. The aluminum profile is an aluminum bar which is obtained by hot melting and extruding so as to obtain aluminum materials with different cross-sectional shapes. The industrial aluminum profile takes aluminum as a main alloy element, other alloy elements such as copper, magnesium, silicon and the like are added, and materials with different section shapes are obtained through a series of working procedures such as heating, extrusion, surface treatment and the like. The performance and the application of the obtained industrial aluminum profile are different according to different added alloy elements. The hollow thin-wall aluminum profile is a common profile and has very large market demand, but the hollow thin-wall aluminum profile has the defects of thin wall requirement, large extrusion deformation, easy deformation in a subsequent straightening process after discharging, low yield of batch production, difficulty in extrusion production of the hollow thin-wall aluminum profile, and incapability of realizing batch production of the hollow thin-wall aluminum profile according to the traditional extrusion process.
Because the property of aluminum is very active and is easy to combine with oxygen in the air to form a layer of compact natural oxide film, the molar volume of the layer of oxide film is much larger than that of aluminum, and the oxide film can be regenerated immediately even if damaged, so that the industrial aluminum profile can be subjected to various surface processing treatments, and the treatment modes can improve the compactness of the oxide film, increase the thickness of the oxide film, improve the insulation property and corrosion resistance, wear resistance, heat resistance and various decorative properties of the oxide film, so that the aluminum profile can be applied to daily production and life, and various industrial environments such as aviation, automobiles, high-speed rails, engine pistons, optical instruments, missile mosaic structures and the like.
The prior art generally adopts a method of coating a coating on the surface of the aluminum alloy to improve the surface property of the aluminum alloy. The water-based paint is an environment-friendly and green paint, and the application of the water-based paint in the field of paints is on the rise in recent years. However, due to the characteristics of water and large surface tension, the film forming property, the coating adhesion and the coating corrosion resistance of the water-based paint need to be improved, and the self-cleaning effect is poor.
Disclosure of Invention
In order to overcome the technical problems, the invention provides the ultrathin aluminum profile which has better surface performance, is simple and feasible in processing method and is suitable for industrial popularization and application.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
an ultra-thin aluminum profile comprises an aluminum profile base body and an aluminum profile coated with the base bodyThe nano coating on the surface of the substrate comprises the following components: nano SiO 2 Granular, nano TiO 2 Particles, nano-scale natural silica-alumina clay and nano-scale adsorption materials.
Preferably, the nano coating further comprises a film forming agent, a film forming auxiliary agent, a modifier, a penetrating agent and a leveling agent.
Preferably, the nano coating comprises the following components in percentage by mass: nano SiO 2 5-8% of particles and nano TiO 2 3-5% of particles, 5-7% of nano natural silicon-aluminum clay, 8-10% of nano adsorption material, 20-30% of film-forming agent, 0.5-2.0% of film-forming auxiliary agent, 0.5-0.8% of modifying agent, 1-5% of penetrating agent, 0.5-1.0% of flatting agent and the balance of water.
Preferably, the nano-scale natural silica-alumina clay is any one or more of kaolin, rectorite and illite.
Preferably, the nanoscale adsorption material is a mixture of a nano beta-type molecular sieve and a nano ZSM-5 molecular sieve;
preferably, the mass ratio of the nano beta-type molecular sieve to the nano ZSM-5 molecular sieve in the nano adsorbing material is 1-3: 1;
preferably, the ratio of silicon to aluminum of the nano ZSM-5 molecular sieve is 400 and the size is less than 100 nm.
Preferably, the nano beta molecular sieve has a silicon-aluminum ratio of 100 and a size of 100-300 nm.
Preferably, the film-forming agent is a non-ionic aqueous bisphenol A epoxy resin emulsion;
preferably, the coalescing agent is a mixture of a dodecanol ester, a glycerol acetonide and a 1-thioglycerol;
preferably, the mass ratio of the dodecanol ester, the acetonide and the 1-thioglycerol in the film-forming additive is 1:2-6: 1-3.
Preferably, the modifier is 2402 phenolic resin;
preferably, the penetrating agent is a mixture of fatty alcohol-polyoxyethylene ether, sodium dodecyl sulfate, sodium lignin sulfonate and glycol;
preferably, the mass ratio of the fatty alcohol-polyoxyethylene ether, the sodium dodecyl sulfate, the sodium lignin sulfonate and the glycol in the penetrant is 1:1-2:3-5: 1.
preferably, the leveling agent is any one or two of polyacrylic acid and carboxymethyl cellulose.
The invention also aims to provide a preparation method of the ultrathin aluminum profile, which comprises the following steps:
(1) mixing nano SiO 2 Granular, nano TiO 2 Mixing the particles, the nano-scale natural silicon-aluminum clay and the nano-scale adsorption material to prepare a mixture A;
(2) adding a film forming auxiliary agent, a modifying agent, a penetrating agent, a flatting agent and water into the film forming agent to prepare a mixed material B;
(3) taking an aluminum profile matrix for pretreatment; and mixing the mixed material A and the mixed material B, and spraying the mixture on the surface of the aluminum profile substrate.
Preferably, the pretreatment is to perform acid washing after the aluminum profile matrix is degreased by ultrasonic waves.
Preferably, an oil removal agent is added in the oil removal process, and the oil removal agent is a mixed solution of sodium carbonate, an OP emulsifier, sodium gluconate and sodium silicate.
Preferably, the oil removing agent contains 20-25g/L, OP g of sodium carbonate, 0.5-1g/L of emulsifier, 0.5-1g/L of sodium gluconate, 5-10g/L of sodium silicate and the balance of water.
Preferably, the pickling solution for pickling is a mixed aqueous solution of phosphoric acid, sulfamic acid and citric acid.
Preferably, the pickling solution contains 0.5-1% of phosphoric acid, 1-3% of sulfamic acid and 1-3% of citric acid by mass percent, and the balance of water.
Preferably, in the step (3), the mixing is performed under the condition of heating and stirring, and the heating temperature is 40-60 ℃.
Compared with the prior art, the invention has the technical advantages that:
(1) the aluminum profile coating provided by the invention has excellent stain resistance, sterilization, corrosion resistance and wear resistance, has good bonding strength with an aluminum alloy substrate, plays a long-acting protection role, can prolong the service life of the aluminum alloy and expand the application field of the aluminum alloy.
(2) The method carries out pretreatment before spraying the aluminum profile, firstly removes oil through ultrasonic waves, thoroughly washes off oil stains attached to the surface of the aluminum profile by utilizing the cavitation effect generated by the ultrasonic waves in liquid, and then carries out acid washing on the aluminum profile through pretreatment liquid, thereby being beneficial to forming a composite film protective layer; the treatment method is simple, the production cost is low, zero emission and zero pollution are realized, and the binding force between the aluminum profile after pretreatment and the sprayed coating is improved.
(3) The film forming assistant, the modifier and other components have good synergistic effect, and the brittleness, the bonding capability, the static bending performance and the acid resistance can be improved while the temperature resistance and the corrosion resistance are improved.
Detailed Description
The present invention will be described below with reference to specific examples to make the technical aspects of the present invention easier to understand and grasp, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are commercially available and are not specifically claimed.
Example 1
The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components:
table 1 nanocoating composition of example 1
The preparation method of the ultrathin aluminum profile comprises the following steps:
(1) mixing nano SiO 2 Granular, nano TiO 2 Particles, nanoparticlesMixing the grade natural silicon-aluminum clay and the nano-grade adsorption material to prepare a mixture A;
(2) adding a film forming auxiliary agent, a modifying agent, a penetrating agent, a flatting agent and water into the film forming agent to prepare a mixed material B;
(3) taking an aluminum profile matrix, degreasing by ultrasonic waves, and then carrying out acid pickling pretreatment; stirring the mixed material A and the mixed material B at 50 ℃, uniformly mixing, and spraying the mixture on the surface of an aluminum profile matrix;
wherein, an oil removal agent is added in the oil removal process, and the oil removal agent is a mixed solution of sodium carbonate, OP-10, sodium gluconate and sodium silicate; the degreasing agent contains 23g/L, OP-100.7 g/L of sodium carbonate, 0.8g/L of sodium gluconate and 7g/L of sodium silicate, and the balance of water;
according to the mass percentage, the pickling solution contains 0.9 percent of phosphoric acid, 2.7 percent of sulfamic acid, 1.4 percent of citric acid and the balance of water.
Example 2
The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components:
table 2 nano-coating composition of example 2
The preparation method of the ultrathin aluminum profile comprises the following steps:
(1) mixing nano SiO 2 Granular, nano TiO 2 Mixing the particles, the nano-scale natural silicon-aluminum clay and the nano-scale adsorption material to prepare a mixture A;
(2) adding a film forming auxiliary agent, a modifying agent, a penetrating agent, a flatting agent and water into the film forming agent to prepare a mixed material B;
(3) taking an aluminum profile matrix, degreasing by ultrasonic waves, and then carrying out acid pickling pretreatment; stirring the mixed material A and the mixed material B at 40 ℃, uniformly mixing, and spraying the mixture on the surface of an aluminum profile matrix;
wherein, an oil removing agent is added in the oil removing process, and the oil removing agent is a mixed solution of sodium carbonate, OP-10, sodium gluconate and sodium silicate; the degreasing agent contains 20g/L, OP-100.5 g/L of sodium carbonate, 0.5g/L of sodium gluconate and 10g/L of sodium silicate, and the balance of water;
according to the mass percentage, the pickling solution contains 0.5 percent of phosphoric acid, 3 percent of sulfamic acid and 1 percent of citric acid, and the balance of water.
Example 3
The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components:
table 3 nanocoating composition for example 3
The preparation method of the ultrathin aluminum profile comprises the following steps:
(1) mixing nano SiO 2 Granular, nano TiO 2 Mixing the particles, the nano-scale natural silicon-aluminum clay and the nano-scale adsorption material to prepare a mixture A;
(2) adding a film forming auxiliary agent, a modifying agent, a penetrating agent, a flatting agent and water into the film forming agent to prepare a mixed material B;
(3) taking an aluminum profile matrix, degreasing by ultrasonic waves, and then carrying out acid pickling pretreatment; stirring the mixed material A and the mixed material B at 60 ℃, uniformly mixing, and spraying the mixture on the surface of an aluminum profile matrix;
wherein, an oil removing agent is added in the oil removing process, and the oil removing agent is a mixed solution of sodium carbonate, OP-10, sodium gluconate and sodium silicate; the degreasing agent contains 25g/L, OP-101 g/L of sodium carbonate, 1g/L of sodium gluconate and 5g/L of sodium silicate, and the balance of water; according to the mass percentage, the pickling solution contains 1% of phosphoric acid, 1% of sulfamic acid and 3% of citric acid, and the balance of water.
Comparative example 1
The difference compared to example 1 is only the composition of the penetrant.
The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components:
table 4 nano-coating composition of comparative example 1
The preparation method of the ultrathin aluminum profile comprises the same steps as example 1.
Comparative example 2
The only difference compared to example 1 is the composition of the coalescent.
The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components:
TABLE 5 Nanopating composition of comparative example 2
The preparation method of the ultrathin aluminum profile comprises the same steps as example 1.
Comparative example 3
The difference compared to example 1 is only in the composition of the coalescent.
The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components:
TABLE 6 Nanopating composition of comparative example 3
The preparation method of the ultrathin aluminum profile comprises the same steps as example 1.
Comparative example 4
The difference compared to example 1 is only in the composition of the coalescent.
The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components:
TABLE 7 nanocoating composition of comparative example 4
The preparation method of the ultrathin aluminum profile comprises the same steps as example 1.
Comparative example 5
The difference compared to example 1 is only the pickling solution composition.
An ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the composition of the nano coating is the same as that in embodiment 1.
The preparation method of the ultrathin aluminum profile comprises the following steps:
(1) - (2) same as in example 1;
(3) taking an aluminum profile matrix, degreasing by ultrasonic waves, and then carrying out acid pickling pretreatment; stirring the mixed material A and the mixed material B at 50 ℃, uniformly mixing, and spraying the mixture on the surface of an aluminum profile matrix;
wherein, an oil removing agent is added in the oil removing process, and the oil removing agent is a mixed solution of sodium carbonate, OP-10, sodium gluconate and sodium silicate; the degreasing agent contains 23g/L, OP-100.7 g/L of sodium carbonate, 0.8g/L of sodium gluconate and 7g/L of sodium silicate, and the balance of water;
according to the mass percentage, the pickling solution contains 0.9 percent of phosphoric acid, 2.7 percent of sulfamic acid, 1.4 percent of carbonic acid and the balance of water.
Effect test
Aluminum profiles were prepared according to the methods of examples 1 to 3 and comparative examples 1 to 5, wherein the thickness of the nano dope coated on the surface of the matrix of the aluminum profile was 50 μm.
1. Corrosion resistance
The corrosion resistance of the aluminum profiles prepared in examples 1-3 and comparative examples 1-4 is evaluated by referring to GB/T10125-2012 artificial atmosphere corrosion test, and the test conditions are as follows: in a neutral salt spray test, the concentration of a sodium chloride solution is 50g/L, the pH value is adjusted to be 6.5 +/-0.5, the temperature is 35 +/-2 ℃, and after observation for 96 hours, the average corrosion rate is calculated.
With reference to the formula: average corrosion rate (mm/a) ═ K × W)/(a × T × D)
In the formula: k is 3.65 × 10 3 (ii) a W is the corrosion weight loss of the sample, g; a is the area of the sample in cm 2 (ii) a T ═ test time, days; d is the density of the material, g/cm 3 The results are shown in Table 1. The lower the average corrosion rate, the better the corrosion resistance.
2. Wear resistance
Reference standard GB/T12967.1-2020 aluminum and aluminum alloy anodic oxide film and organic polymer film detection method part 1: determination of abrasion resistance the abrasion resistance of the aluminum profiles prepared in examples 1 to 3 and comparative examples 1 to 4 was evaluated by an abrasive blasting method using an abrasive blasting tester with an abrasive of green silicon carbide having a grain size of F100 at a test angle of 45 °, a test pressure of 15kPa, and a test height of 10mm, and abrasive blasting experiments were carried out for the test abrasive blasting time, and the results are shown in table 1. The longer the time, the better the abrasion resistance.
TABLE 1 Corrosion and abrasion resistance results
| Test group | Average Corrosion Rate (mm/a) | Duration of jet mill(s) |
| Example 1 | 0.06 | 75.1 |
| Example 2 | 0.07 | 74.4 |
| Example 3 | 0.07 | 75.2 |
| Comparative example 1 | 0.11 | 54.9 |
| Comparative example 2 | 0.25 | 58.3 |
| Comparative example 3 | 0.32 | 46.8 |
| Comparative example 4 | 0.09 | 60.5 |
Therefore, the aluminum profile provided by the invention has better corrosion resistance and wear resistance, and the composition of the nano coating has larger influence on the effect.
3. Adhesion force
The adhesion between the aluminum-based substrate and the surface nano-coating in examples 1-3 and comparative examples 1-5 was evaluated by referring to the method of GB 1720 (1989) paint film adhesion test method), and the results are shown in Table 2.
TABLE 2 adhesion
Therefore, the adhesive force of the aluminum type base material and the surface coating is good, and the composition of the nano coating and the composition of the pretreatment agent of the aluminum profile substrate have great influence on the effect of the nano coating.
The above detailed description is directed to one of the possible embodiments of the present invention, which is not intended to limit the scope of the invention, but rather the scope of the invention is intended to include all equivalent implementations or modifications without departing from the scope of the invention.
Claims (5)
1. The ultrathin aluminum profile comprises an aluminum profile matrix and a nano coating coated on the surface of the aluminum profile matrix, wherein the nano coating comprises the following components in percentage by mass: nano SiO 2 5-8% of particles and nano TiO 2 3-5% of particles, 5-7% of nano natural silicon-aluminum clay, 8-10% of nano adsorbing material, 20-30% of film forming agent, 0.5-2.0% of film forming auxiliary agent, 0.5-0.8% of modifying agent, 1-5% of penetrating agent, 0.5-1.0% of flatting agent and the balance of water;
the film-forming agent is nonionic water-based bisphenol A epoxy resin emulsion; the film-forming assistant is a mixture of dodecyl alcohol ester, acetonide and 1-thioglycerol; wherein the mass ratio of the dodecanol ester to the acetonide condensed glycerol to the 1-thioglycerol is 1:2-6: 1-3;
the penetrating agent is a mixture of fatty alcohol-polyoxyethylene ether, sodium dodecyl sulfate, sodium lignin sulfonate and glycol; wherein the mass ratio of the fatty alcohol-polyoxyethylene ether to the sodium dodecyl sulfate to the sodium lignin sulfonate to the glycol is 1:1-2:3-5: 1; the nano-grade adsorption material is a mixture of a nano beta-type molecular sieve and a nano ZSM-5 molecular sieve; wherein the mass ratio of the nano beta molecular sieve to the nano ZSM-5 molecular sieve is 1-3: 1; the preparation method of the ultrathin aluminum profile comprises the following steps:
(1) mixing nano SiO 2 Granular, nano TiO 2 Mixing the particles, the nano-scale natural silicon-aluminum clay and the nano-scale adsorption material to prepare a mixture A;
(2) adding a film forming auxiliary agent, a modifier, a penetrating agent, a flatting agent and water into a film forming agent to prepare a mixed material B;
(3) taking an aluminum profile matrix for pretreatment; mixing the mixed material A and the mixed material B, and spraying the mixture on the surface of an aluminum profile matrix;
the pretreatment is to carry out acid washing after the aluminum profile matrix is subjected to ultrasonic oil removal; according to the mass percentage, the pickling solution contains 0.5-1% of phosphoric acid, 1-3% of sulfamic acid, 1-3% of citric acid and the balance of water.
2. The ultra-thin aluminum profile as claimed in claim 1, wherein the nano-sized natural silica-alumina clay is any one or more of kaolin, rectorite and illite.
3. The preparation method of the ultrathin aluminum profile as claimed in claim 1, characterized by comprising the following steps:
(1) mixing nano SiO 2 Granular, nano TiO 2 Mixing the particles, the nano-scale natural silicon-aluminum clay and the nano-scale adsorption material to prepare a mixture A;
(2) adding a film forming auxiliary agent, a modifying agent, a penetrating agent, a flatting agent and water into the film forming agent to prepare a mixed material B;
(3) taking an aluminum profile matrix for pretreatment; and mixing the mixture A and the mixture B, and spraying the mixture on the surface of the aluminum profile substrate.
4. The method for preparing the ultrathin aluminum profile as claimed in claim 3, wherein a degreasing agent is added in the degreasing process, and the degreasing agent is a mixed solution of sodium carbonate, an OP emulsifier, sodium gluconate and sodium silicate; the pickling solution for pickling is a mixed aqueous solution of phosphoric acid, sulfamic acid and citric acid.
5. The preparation method of the ultrathin aluminum profile as claimed in claim 4, characterized in that the degreasing agent contains 20-25g/L, OP g of sodium carbonate, 0.5-1g/L of emulsifier, 0.5-1g/L of sodium gluconate and 5-10g/L of sodium silicate, and the balance of water.
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