阅读说明：本技术 一种抗紫外线超耐候涂层铝箔的制备工艺 (Preparation process of ultraviolet-resistant super-weather-resistant coating aluminum foil ) 是由 张君 钱本强 于 2020-06-08 设计创作，主要内容包括：本发明公开了一种抗紫外线超耐候涂层铝箔的制备工艺,本发明通过在铝箔表面涂覆抗紫外线涂层、耐候涂层、亲水性涂层,大大提高了铝箔的性能；通过抗紫外线涂层使铝箔具备优异的抗紫外线性能,不会因紫外线的照射而老化,适用于户外应用；通过耐候涂层使铝箔能够适应多种气候变化,不易剥落、无裂纹,延长铝箔的使用寿命；通过亲水性涂层使铝箔在换热时具有亲水作用,能加快扩散铝箔表面的凝集水,加快换热过程。通过在釜体内设置第一搅拌器、第二搅拌器、第三搅拌器,提高搅拌效果与搅拌效率,从而进一步提高涂层的制备效率。(The invention discloses a preparation process of an ultraviolet-resistant super-weather-resistant coating aluminum foil, which greatly improves the performance of the aluminum foil by coating an ultraviolet-resistant coating, a weather-resistant coating and a hydrophilic coating on the surface of the aluminum foil; the aluminum foil has excellent ultraviolet resistance through the ultraviolet resistant coating, cannot be aged due to ultraviolet irradiation, and is suitable for outdoor application; the aluminum foil can adapt to various climatic changes through the weather-resistant coating, is not easy to peel off and has no cracks, and the service life of the aluminum foil is prolonged; the hydrophilic coating can make the aluminum foil have a hydrophilic effect during heat exchange, accelerate the diffusion of the condensed water on the surface of the aluminum foil and accelerate the heat exchange process. Through at internal first agitator, second agitator, the third agitator of setting of cauldron, improve stirring effect and stirring efficiency to further improve the preparation efficiency of coating.)

1. A preparation process of an anti-ultraviolet super-weather-resistant coating aluminum foil is characterized by comprising the following steps of;

step 1-preparation of hydrophilic coating:

(1) weighing the following raw materials: 30-45 parts of water-based acrylic acid, 5-10 parts of ethanolamine and 45-65 parts of ethylene glycol monobutyl ether;

(2) putting the weighed raw materials into a first reaction kettle for fully stirring to obtain a hydrophilic coating;

step 2-preparation of a weather-resistant coating:

(1) weighing the following raw materials: 10-20 parts of epoxy resin, 10-20 parts of polybutadiene resin, 20-35 parts of tartaric acid, 5-10 parts of polyacrylamide and 15-55 parts of propylene glycol methyl acetate;

(2) putting the weighed raw materials into a second reaction kettle for fully stirring to obtain a weather-resistant coating;

step 3-preparation of an ultraviolet-resistant coating:

(1) weighing the following raw materials: 80-90 parts of bisphenol A epoxy resin, 25-35 parts of aliphatic amine curing agent, 2-7 parts of aliphatic amine accelerator, 7-17 parts of rosin, 20-35 parts of ethylene glycol, UV-465-10 parts, 4-9 parts of nano iron oxide, 10-12 parts of titanium dioxide, 1-2 parts of defoaming agent and 1-3 parts of hydrophobic agent;

(2) putting bisphenol A epoxy resin, an aliphatic amine curing agent, an aliphatic amine accelerator, rosin, ethylene glycol, UV-46, nano iron oxide and titanium dioxide into a third reaction kettle, stirring for 5-15 minutes, adding titanium dioxide, a defoaming agent and a hydrophobic agent, and stirring for 10-20 minutes to obtain an ultraviolet-resistant coating;

step 3-pretreatment of aluminum foil:

(1) degreasing treatment: placing the aluminum foil in a degreasing tank filled with a degreasing agent, wherein the degreasing agent reacts with oil stains on the surface of the aluminum foil, the temperature of the degreasing tank is kept at 20-40 ℃, the treatment time is 7-10s, and the pH is 10-13;

(2) and (3) water washing treatment: placing the aluminum foil subjected to degreasing treatment in a degreasing solution cleaning tank for cleaning, placing the aluminum foil in a hot water cleaning tank for primary water cleaning, and then placing the aluminum foil in a normal-temperature water cleaning tank for secondary water cleaning;

(3) and (3) drying treatment: placing the washed aluminum foil in a drying furnace;

step 4-first coating: coating an anti-ultraviolet coating on the surface of the aluminum foil, and cooling after primary curing at the temperature of 230 ℃ and 300 ℃ for 25-30 s;

step 5-second coating: coating a weather-resistant coating on the surface of the ultraviolet-resistant coating, and cooling after secondary curing at the temperature of 230-300 ℃ for 30-35 seconds;

step 6-third coating: coating a hydrophilic coating on the surface of the weather-resistant coating, curing for the third time at the temperature of 230 ℃ and 250 ℃ for 25-30s, and cooling.

2. The process for preparing the ultra-weatherable ultraviolet-resistant coated aluminum foil as claimed in claim 1, wherein the degreasing agent is an alkaline solution containing sodium ions.

3. The process for preparing an ultra-weatherable coated aluminum foil with ultraviolet resistance as claimed in claim 1, wherein the temperature of the hot water cleaning tank is maintained at 40-60 ℃.

4. The process for preparing the ultraviolet-resistant and super-weather-resistant coated aluminum foil as claimed in claim 1, wherein squeezing rollers are installed at the outlets of the degreasing solution cleaning tank, the hot water cleaning tank and the normal temperature water cleaning tank.

5. The process for preparing the ultra-weatherable ultraviolet-resistant coated aluminum foil as claimed in claim 1, wherein the temperature of the drying furnace is maintained at 300-400 ℃.

6. The process for preparing the ultraviolet-resistant and super-weather-resistant coated aluminum foil as claimed in claim 1, wherein the defoaming agent is silicone emulsion; the hydrophobic agent is 6600.

7. The process for preparing the ultraviolet-resistant and super-weather-resistant coated aluminum foil as claimed in claim 1, 2, 3, 4, 5 or 6, wherein the first reaction kettle, the second reaction kettle and the third reaction kettle have the same structure and size;

the first reaction kettle comprises a kettle body (1), a motor (2) arranged at the top of the kettle body (1), a stirring shaft (3) which is rotatably arranged in the kettle body (1) through a rolling bearing and one end of which extends out of the kettle body (1) and is arranged on an output shaft of the motor (2), a first stirrer (4) arranged on the stirring shaft (3), a second stirrer (5) arranged on the first stirrer (4), and a third stirrer (14) arranged on the stirring shaft (3);

the first stirrer (4) comprises a plurality of stirring rings (6) which are arranged on the stirring shaft (3) through a plurality of supporting columns (15) and distributed along the central axis direction of the stirring shaft (3), fixing columns (7) which are arranged between two adjacent stirring rings (6) at the upper end and the lower end respectively and surround the central axis of the stirring rings (6) in an annular array, and stirring blades (8) arranged on the fixing columns (7);

the second stirrer (5) is positioned between the first stirrer (4) and the stirring shaft (3), the second stirrer (5) comprises a plurality of mixing blades (9) which are arranged on the inner surface of the stirring ring (6) and surround the central axis of the stirring ring (6) in an annular array, the mixing blades (9) are positioned between two adjacent fixing columns (7), and a plurality of mixing blades (10) which are arranged on the mixing blades (9) and are coaxially arranged, and the diameters of the mixing blades (10) are increased along with the increase of the distance between the mixing blades (10) and the stirring shaft (3);

a plurality of mixing holes (11) are arranged on the mixing blade (9); the mixing blade (10) is of a circular arc structure, the mixing blade (10) and the mixing blade (9) are in the same plane, and the central angle subtended by the mixing blade (10) is less than 180 degrees and greater than 90 degrees.

8. The process for preparing the ultra-violet resistant and ultra-weather resistant coated aluminum foil as claimed in claim 7, wherein the third stirrer (14) is a screw type stirrer.

9. The process for preparing the ultraviolet-resistant and super-weather-resistant coated aluminum foil as claimed in claim 7, wherein the stirring blade (8) comprises a stirring fin A (12) of a circular arc structure, and a stirring fin B (13) having one end mounted on the stirring fin A (12) and being symmetrical to the stirring fin A (12).

Technical Field

The invention relates to the technical field of aluminum foil manufacturing, in particular to a preparation process of an ultraviolet-resistant super-weather-resistant coating aluminum foil.

Background

The heat exchanger is a device for transferring part of heat of hot fluid to cold fluid, and is also called a heat exchanger. The heat exchanger plays an important role in chemical industry, petroleum industry, power industry, food industry and other industrial production and is widely applied.

The aluminum foil fin for the heat exchanger performs conversion between heat emission and heat absorption during operation. The existing aluminum foil is generally coated by a water-based acrylic acid material, but the aluminum foil of a water-based anticorrosive layer can not meet the use requirements of special environments, such as desert regions, marine environments, chemical industry and the like, and is tested by strong ultraviolet radiation and extreme climate. In order to solve the problems of ultraviolet resistance and weather resistance in special environments, the invention improves the aluminum foil coating.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a preparation process of an anti-ultraviolet super-weather-resistant coating aluminum foil.

The technical scheme for solving the problems comprises the following steps: a preparation process of an anti-ultraviolet super-weather-resistant coating aluminum foil comprises the following steps;

step 1-preparation of hydrophilic coating:

(1) weighing the following raw materials: 30-45 parts of water-based acrylic acid, 5-10 parts of ethanolamine and 45-65 parts of ethylene glycol monobutyl ether;

(2) putting the weighed raw materials into a first reaction kettle for fully stirring to obtain a hydrophilic coating;

step 2-preparation of a weather-resistant coating:

(1) weighing the following raw materials: 10-20 parts of epoxy resin, 10-20 parts of polybutadiene resin, 20-35 parts of tartaric acid, 5-10 parts of polyacrylamide and 15-55 parts of propylene glycol methyl acetate;

(2) putting the weighed raw materials into a second reaction kettle for fully stirring to obtain a weather-resistant coating;

step 3-preparation of an ultraviolet-resistant coating:

(1) weighing the following raw materials: 80-90 parts of bisphenol A epoxy resin, 25-35 parts of aliphatic amine curing agent, 2-7 parts of aliphatic amine accelerator, 7-17 parts of rosin, 20-35 parts of ethylene glycol, UV-465-10 parts, 4-9 parts of nano iron oxide, 10-12 parts of titanium dioxide, 1-2 parts of defoaming agent and 1-3 parts of hydrophobic agent;

(2) putting bisphenol A epoxy resin, an aliphatic amine curing agent, an aliphatic amine accelerator, rosin, ethylene glycol, UV-46, nano iron oxide and titanium dioxide into a third reaction kettle, stirring for 5-15 minutes, adding titanium dioxide, a defoaming agent and a hydrophobic agent, and stirring for 10-20 minutes to obtain an ultraviolet-resistant coating;

step 3-pretreatment of aluminum foil:

(1) degreasing treatment: placing the aluminum foil in a degreasing tank filled with a degreasing agent, wherein the degreasing agent reacts with oil stains on the surface of the aluminum foil, the temperature of the degreasing tank is kept at 20-40 ℃, the treatment time is 7-10s, and the pH is 10-13;

(2) and (3) water washing treatment: placing the aluminum foil subjected to degreasing treatment in a degreasing solution cleaning tank for cleaning, placing the aluminum foil in a hot water cleaning tank for primary water cleaning, and then placing the aluminum foil in a normal-temperature water cleaning tank for secondary water cleaning;

(3) and (3) drying treatment: placing the washed aluminum foil in a drying furnace;

step 4-first coating: coating an anti-ultraviolet coating on the surface of the aluminum foil, and cooling after primary curing at the temperature of 230 ℃ and 300 ℃ for 25-30 s;

step 5-second coating: coating a weather-resistant coating on the surface of the ultraviolet-resistant coating, and cooling after secondary curing at the temperature of 230-300 ℃ for 30-35 seconds;

step 6-third coating: coating a hydrophilic coating on the surface of the weather-resistant coating, curing for the third time at the temperature of 230 ℃ and 250 ℃ for 25-30s, and cooling.

Further, the degreasing agent is an alkaline solution containing sodium ions.

Further, the temperature of the hot water cleaning tank is kept between 40 and 60 ℃.

Furthermore, squeezing rollers are arranged at the outlets of the degreasing liquid cleaning tank, the hot water cleaning tank and the normal-temperature water cleaning tank.

Further, the temperature of the drying furnace is maintained at 300-400 ℃.

Further, the defoaming agent is emulsified silicone oil; the water repellent agent is a water repellent agent 6600,

further, the first reaction kettle, the second reaction kettle and the third reaction kettle have the same structure and size;

the first reaction kettle comprises a kettle body, a motor arranged at the top of the kettle body, a stirring shaft which is rotatably arranged in the kettle body through a rolling bearing, one end of the stirring shaft extends out of the kettle body and is arranged on an output shaft of the motor, a first stirrer arranged on the stirring shaft, a second stirrer arranged on the first stirrer and a third stirrer arranged on the stirring shaft;

the first stirrer comprises a plurality of stirring rings which are arranged on the stirring shaft through a plurality of support columns and distributed along the central axis direction of the stirring shaft, fixing columns of which the upper ends and the lower ends are respectively arranged between two adjacent stirring rings and annularly arrayed around the central axis of the stirring rings, and stirring blades arranged on the fixing columns;

the second stirrer is positioned between the first stirrer and the stirring shaft, the second stirrer comprises a plurality of mixing blades which are arranged on the inner surface of the stirring ring and annularly arrayed around the central axis of the stirring ring, the mixing blades are positioned between two adjacent fixing columns, and a plurality of mixing blades which are coaxially arranged are arranged on the mixing blades, and the diameters of the mixing blades are increased along with the increase of the distance between the mixing blades and the stirring shaft;

the mixing blade is provided with a plurality of mixing holes; the mixing blade is in a circular arc structure, the mixing blade and the mixing blade are in the same plane, and the central angle subtended by the mixing blade is less than 180 degrees and greater than 90 degrees.

Further, the third stirrer is a screw type stirrer.

Furthermore, the stirring blade comprises a stirring fin A with an arc structure, and a stirring fin B with one end arranged on the stirring fin A and symmetrical to the stirring fin A.

The invention has the following beneficial effects: according to the invention, the ultraviolet-resistant coating, the weather-resistant coating and the hydrophilic coating are coated on the surface of the aluminum foil, so that the performance of the aluminum foil is greatly improved; the aluminum foil has excellent ultraviolet resistance through the ultraviolet resistant coating, cannot be aged due to ultraviolet irradiation, and is suitable for outdoor application; the aluminum foil can adapt to various climatic changes through the weather-resistant coating, is not easy to peel off and has no cracks, and the service life of the aluminum foil is prolonged; the hydrophilic coating can make the aluminum foil have a hydrophilic effect during heat exchange, accelerate the diffusion of the condensed water on the surface of the aluminum foil and accelerate the heat exchange process. Through at internal first agitator, second agitator, the third agitator of setting of cauldron, improve stirring effect and stirring efficiency to further improve the preparation efficiency of coating.

Drawings

FIG. 1 is a schematic view of the structure of a first reaction vessel of the present invention

FIG. 2 is a first schematic structural diagram of a first stirrer, a second stirrer and a third stirrer according to the present invention;

FIG. 3 is a second schematic structural diagram of the first stirrer, the second stirrer and the third stirrer according to the present invention.

In the figure: 1-kettle body, 2-motor, 3-stirring shaft, 4-first stirrer, 5-second stirrer, 6-stirring ring, 7-fixing column, 8-stirring blade, 9-mixing blade, 10-mixing sheet, 11-mixing hole, 12-stirring fin A, 13-stirring fin B, 14-third stirrer and 15-supporting column.

Detailed Description

The invention is further described with reference to the following drawings and detailed description.