阅读说明：本技术 一种隔热断桥铝型材电泳上漆工艺 (Electrophoresis painting process for heat-insulation bridge-cut-off aluminum profile ) 是由 王元飞 李岗飞 张云龙 于 2020-11-13 设计创作，主要内容包括：本发明公开了一种隔热断桥铝型材电泳上漆工艺,包括以下步骤；步骤一、上漆前处理；步骤二、制备电泳漆；步骤三、将步骤二得到的电泳漆放入电泳槽中,将相关的参数调节为固体份7％-9％,温度20-25℃,pH8.0-8.8,电阻率ΠΩ·cm(20℃):1500-2500；步骤四、将步骤一处理完成的铝型材取出,放入电泳槽中与电泳漆进行电泳处理,电泳处理的参数为电压:80-250V(DC),电泳时间:1-3min,电流密度:15-50Aπm2,直至铝型材涂膜厚度达到7-12μm。本发明易实现自动化生产,由于电泳涂装在水性电泳槽中进行,与阳极氧化、电解着色工艺类似,处理时间短,涂料的利用率高涂膜均匀致密,涂膜质量好,可自由控制涂膜的厚度,提高铝型材加工技术,提高电泳型材的合格率。(The invention discloses an electrophoresis painting process for a heat-insulation bridge-cut-off aluminum profile, which comprises the following steps of; step one, pretreatment of painting; step two, preparing electrophoretic paint; step three, putting the electrophoretic paint obtained in the step two into an electrophoresis tank, and adjusting related parameters to 7-9% of solid content, 20-25 ℃, pH8.0-8.8, and 1500-2500 of resistivity pi omega cm (20 ℃); and step four, taking out the aluminum profile processed in the step one, putting the aluminum profile into an electrophoresis tank, and carrying out electrophoresis treatment on the aluminum profile and the electrophoretic paint, wherein the parameters of the electrophoresis treatment are voltage of 80-250V (DC), electrophoresis time of 1-3min and current density of 15-50A pi m2 until the coating thickness of the aluminum profile reaches 7-12 mu m. The invention is easy to realize automatic production, because the electrophoretic coating is carried out in the water-based electrophoretic bath, similar to the anodic oxidation and electrolytic coloring process, the treatment time is short, the utilization rate of the coating is high, the coating is uniform and compact, the coating quality is good, the thickness of the coating can be freely controlled, the processing technology of the aluminum profile is improved, and the qualification rate of the electrophoretic profile is improved.)

1. The electrophoresis painting process of the heat-insulation bridge-cut-off aluminum profile is characterized by comprising the following steps of: comprises the following steps;

step one, pretreatment before painting: polishing the surface of the aluminum profile to remove oxide skin and burrs, putting the aluminum profile into ultrasonic equipment, mixing the aluminum profile with cleaning fluid to perform surface grease treatment, cleaning the aluminum profile with warm water after treatment, and drying the aluminum profile;

step two, preparing electrophoretic paint;

s1, mixing the resin, the polyester polyol and the deionized water, fully dissolving the mixture with the nonionic surfactant, and dropwise adding a 5-10% NaOH solution until the pH value of the solution is 6-6.5;

s2, adding the modified amine curing agent, the cross-linking agent and the flatting agent, stirring, diluting with a neutralizing agent, and stirring and emulsifying at a high speed for 1-1.5h to obtain the electrophoretic paint;

step three, putting the electrophoretic paint obtained in the step two into an electrophoresis tank, and adjusting related parameters to 7-9% of solid content, 20-25 ℃, pH8.0-8.8, and 1500-2500 of resistivity pi omega cm (20 ℃);

taking out the aluminum profile processed in the step one, putting the aluminum profile into an electrophoresis tank, and carrying out electrophoresis treatment on the aluminum profile and electrophoretic paint, wherein the parameters of the electrophoresis treatment are voltage of 80-250V (DC), electrophoresis time of 1-3min and current density of 15-50A pi m2 until the coating thickness of the aluminum profile reaches 7-12 mu m;

and step five, drying the electrophoretic painted aluminum section in a radiation convection mode, wherein the anode electrophoretic paint film needs to be baked at the temperature of 140-170 ℃.

2. The electrophoretic painting process for the heat-insulation bridge-cut-off aluminum profile according to claim 1, which is characterized in that: the electrophoresis tank is a rectangular tank, the tank body is made of a 4-6mm steel plate, the lining of the electrophoresis tank is made of polypropylene or epoxy glass steel, and an overflow tank is arranged.

3. The electrophoretic painting process for the heat-insulation bridge-cut-off aluminum profile according to claim 1, which is characterized in that: in the second step, the electrophoretic paint is composed of the following raw materials in parts by weight: 40-60 parts of resin, 20-30 parts of polyester polyol, 15-20 parts of modified amine curing agent, 10-18 parts of deionized water, 8-15 parts of cross-linking agent, 5-8 parts of flatting agent, 5-8 parts of neutralizing agent and 2-5 parts of nonionic surfactant.

4. The electrophoretic painting process for the heat-insulation bridge-cut-off aluminum profile according to claim 1, which is characterized in that: in the second step, the resin is any one or more of polyester resin, epoxy resin or olefine acid resin.

5. The electrophoretic painting process for the heat-insulation bridge-cut-off aluminum profile according to claim 1, which is characterized in that: and in the fourth step, an ion exchange treatment system is arranged in the electrophoresis tank, the pH value of the cathode can be continuously increased during the anode electrophoresis, impurities in the tank liquor can be removed by adopting the ion exchange treatment system, and the pH value of the tank liquor is stable due to anions and cations.

6. The electrophoresis painting process of the heat-insulation bridge-cut-off aluminum profile according to claim 2, characterized in that: in the fourth step, the electrophoresis of the electrophoresis adopts direct current, the direct current is required to be arbitrarily adjustable from 0A to 250A, and the ripple factor of a power supply is less than 6 percent.

Technical Field

The invention relates to the technical field of aluminum profile electrophoresis, in particular to an electrophoretic painting process for a heat-insulation bridge-cut-off aluminum profile.

Background

The traditional surface treatment process of the aluminum section is oxidation, coloring and sealing treatment, and a conversion coating of the aluminum is easy to corrode and has poor durability when being used outdoors for a long time, particularly in acid rain or marine environment, so that a coating method is tried to improve the decorative performance and the service life of the architectural aluminum section since the 70 s, and at present, electrophoretic coating, powder coating and fluorocarbon spraying are used industrially and successfully.

Among the surface treatment technologies, electrocoating is the most developed technology. The aluminum profile is subjected to electrophoresis coating after anodization and electrolytic coloring, and has double-layer protection. The coating has high transparency, high metal texture, high corrosion resistance and high weather resistance, is more decorative than spray painting and powder spraying, is deeply loved by users, is widely used for home decoration, has high decoration and can highlight the metal luster of the aluminum profile, has great potential market, and therefore, the electrophoretic coating is increasingly used on the building aluminum profile; however, in practice, the electrophoretic painting process of the heat-insulating bridge-cut-off section bar in the actual production process is troublesome, the utilization rate of the coating is low, the coating is uniform and not dense, and the coating is not thick and uniform, so that the product quality is influenced.

Disclosure of Invention

The invention aims to provide an electrophoretic painting process for a heat-insulation bridge-cut-off aluminum profile, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: an electrophoresis painting process for a heat-insulation bridge-cut aluminum profile comprises the following steps;

step one, pretreatment before painting: polishing the surface of the aluminum profile to remove oxide skin and burrs, putting the aluminum profile into ultrasonic equipment, mixing the aluminum profile with cleaning fluid to perform surface grease treatment, cleaning the aluminum profile with warm water after treatment, and drying the aluminum profile;

step two, preparing electrophoretic paint;

s1, mixing the resin, the polyester polyol and the deionized water, fully dissolving the mixture with the nonionic surfactant, and dropwise adding a 5-10% NaOH solution until the pH value of the solution is 6-6.5;

s2, adding the modified amine curing agent, the cross-linking agent and the flatting agent, stirring, diluting with a neutralizing agent, and stirring and emulsifying at a high speed for 1-1.5h to obtain the electrophoretic paint;

step three, putting the electrophoretic paint obtained in the step two into an electrophoresis tank, and adjusting related parameters to 7-9% of solid content, 20-25 ℃, pH8.0-8.8, and 1500-2500 of resistivity pi omega cm (20 ℃);

taking out the aluminum profile processed in the step one, putting the aluminum profile into an electrophoresis tank, and carrying out electrophoresis treatment on the aluminum profile and electrophoretic paint, wherein the parameters of the electrophoresis treatment are voltage of 80-250V (DC), electrophoresis time of 1-3min and current density of 15-50A pi m2 until the coating thickness of the aluminum profile reaches 7-12 mu m;

and step five, drying the electrophoretic painted aluminum section in a radiation convection mode, wherein the anode electrophoretic paint film needs to be baked at the temperature of 140-170 ℃.

Preferably, the electrophoresis tank is a rectangular tank, the tank body is made of a 4-6mm steel plate, the lining of the electrophoresis tank is made of polypropylene or epoxy glass steel, and the electrophoresis tank is provided with an overflow tank.

Preferably, in the second step, the electrophoretic paint is composed of the following raw materials in parts by weight: 40-60 parts of resin, 20-30 parts of polyester polyol, 15-20 parts of modified amine curing agent, 10-18 parts of deionized water, 8-15 parts of cross-linking agent, 5-8 parts of flatting agent, 5-8 parts of neutralizing agent and 2-5 parts of nonionic surfactant.

Preferably, in the second step, the resin is any one or more of polyester resin, epoxy resin or olefine acid resin.

Preferably, in the fourth step, an ion exchange treatment system is arranged in the electrophoresis tank, the pH value of the cathode is increased continuously during the anode electrophoresis, impurities in the tank liquor can be removed by adopting the ion exchange treatment system, and the pH value of the tank liquor is stabilized by adopting anions and cations.

Preferably, in the fourth step, the electrophoresis of the electrophoresis is direct current, the direct current is required to be arbitrarily adjustable from 0A to 250A, and the ripple factor of the power supply is less than 6%.

The electrophoresis painting process for the heat-insulation bridge-cut-off aluminum profile, provided by the invention, has the beneficial effects that: the invention is easy to realize automatic production, because the electrophoretic coating is carried out in the water-based electrophoretic bath, is similar to the anodic oxidation and electrolytic coloring process, has short treatment time, is easy to realize the flow line operation of the whole process, has high utilization rate of the coating, uniform and compact coating and good coating quality, can freely control the thickness of the coating, improves the processing technology of the aluminum profile and improves the qualification rate of the electrophoretic profile.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Embodiment 1, the present invention provides a technical solution: an electrophoresis painting process for a heat-insulation bridge-cut aluminum profile comprises the following steps; step one, pretreatment before painting: polishing the surface of the aluminum profile to remove oxide skin and burrs, putting the aluminum profile into ultrasonic equipment, mixing the aluminum profile with cleaning fluid to perform surface grease treatment, cleaning the aluminum profile with warm water after treatment, and drying the aluminum profile; step two, preparing electrophoretic paint; s1, mixing the resin, the polyester polyol and the deionized water, fully dissolving the mixture with the nonionic surfactant, and dropwise adding 8% NaOH solution until the pH value of the solution is 6.2; s2, adding the modified amine curing agent, the cross-linking agent and the flatting agent, stirring, diluting with a neutralizing agent, and stirring at a high speed for emulsifying for 1.2h to obtain the electrophoretic paint; the electrophoretic paint is prepared from the following raw materials in parts by weight: 50 parts of resin, 25 parts of polyester polyol, 18 parts of modified amine curing agent, 15 parts of deionized water, 13 parts of crosslinking agent, 7 parts of flatting agent, 6 parts of neutralizing agent and 3 parts of nonionic surfactant, wherein the resin is polyester resin and epoxy resin; step three, putting the electrophoretic paint obtained in the step two into an electrophoresis tank, and adjusting related parameters to 8% of solid content, 23 ℃, pH8.6 and 2000 of resistivity pi omega cm (20 ℃); the electrophoresis tank is a rectangular tank, the tank body is made of a 5mm steel plate, the lining of the electrophoresis tank is made of polypropylene or epoxy glass steel, the overflow tank is internally provided with an ion exchange treatment system, the pH value of a cathode is continuously increased during anode electrophoresis, the ion exchange treatment system is adopted to remove impurities in the tank liquor, and anions and cations stabilize the pH value of the tank liquor; taking out the aluminum profile processed in the step one, putting the aluminum profile into an electrophoresis tank, and carrying out electrophoresis treatment on the aluminum profile and electrophoretic paint, wherein the parameters of the electrophoresis treatment are voltage 220V (DC), electrophoresis time 2min and current density 35A pi m2 until the coating thickness of the aluminum profile reaches 8 mu m, the electrophoresis of the electrophoresis adopts direct current, the direct current is required to be 0-250A and can be adjusted freely, and the ripple factor of a power supply is less than 6%; and step five, drying the electrophoretic painted aluminum section in a radiation convection mode, wherein the anodic electrophoretic paint film needs to be baked at the temperature of 150 ℃.

Embodiment 2, the present invention provides another technical solution: an electrophoresis painting process for a heat-insulation bridge-cut aluminum profile comprises the following steps; step one, pretreatment before painting: polishing the surface of the aluminum profile to remove oxide skin and burrs, putting the aluminum profile into ultrasonic equipment, mixing the aluminum profile with cleaning fluid to perform surface grease treatment, cleaning the aluminum profile with warm water after treatment, and drying the aluminum profile; step two, preparing electrophoretic paint; s1, mixing the resin, the polyester polyol and the deionized water, fully dissolving the mixture with the nonionic surfactant, and dropwise adding 6% NaOH solution until the pH value of the solution is 6.5; s2, adding the modified amine curing agent, the cross-linking agent and the flatting agent, stirring, diluting with a neutralizing agent, and stirring at a high speed for emulsifying for 1.5h to obtain the electrophoretic paint; the electrophoretic paint is prepared from the following raw materials in parts by weight: 45 parts of resin, 23 parts of polyester polyol, 18 parts of modified amine curing agent, 15 parts of deionized water, 12 parts of cross-linking agent, 8 parts of flatting agent, 6 parts of neutralizing agent and 4 parts of nonionic surfactant, wherein the resin is polyester resin and olefine acid resin; step three, putting the electrophoretic paint obtained in the step two into an electrophoresis tank, and adjusting related parameters to 7.4% of solid content, 22 ℃, pH8.8 and 2300 of resistivity pi omega cm (20 ℃); the electrophoresis tank is a rectangular tank, the tank body is made of a 6mm steel plate, the lining of the electrophoresis tank is made of polypropylene or epoxy glass steel, the overflow tank is internally provided with an ion exchange treatment system, the pH value of a cathode is increased continuously during anode electrophoresis, the ion exchange treatment system is adopted to remove impurities in the tank liquor, and anions and cations stabilize the pH value of the tank liquor; taking out the aluminum profile processed in the step one, putting the aluminum profile into an electrophoresis tank, and carrying out electrophoresis treatment on the aluminum profile and electrophoretic paint, wherein the parameters of the electrophoresis treatment are voltage of 180V (DC), electrophoresis time of 2.5min and current density of 40A pi m2 until the thickness of a coating film of the aluminum profile reaches 9 mu m, the electrophoresis of the electrophoresis adopts direct current, the direct current is required to be freely adjustable at 0-250A, and the ripple factor of a power supply is less than 6%; and step five, drying the electrophoretic painted aluminum section in a radiation convection mode, wherein the anodic electrophoretic paint film needs to be baked at the temperature of 155 ℃.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.