阅读说明：本技术 一种替代多色氧化的丝印工艺 (Screen printing process replacing multicolor oxidation ) 是由 黄天超 罗秋东 于 2020-05-26 设计创作，主要内容包括：本发明公开一种替代多色氧化的丝印工艺,包括以下步骤：步骤一,对铝基材进行打磨抛光,去除铝基材表面的氧化层及其他杂质；步骤二,通过碱洗对铝基材去除油污；步骤三,通过化学药水进行抛光处理,提高铝基材的表面的光亮度；步骤四,通过电氧化使铝基材表面形成氧化层；步骤五,将铝基材预定的几种不同颜色的油墨通过丝印一次性渗透进相应的预定区域；步骤六,通过封孔剂对丝印好的铝基材进行电氧化封孔。本发明提供的无凸纹丝印工艺大大减短了多色氧化丝印的工序,减少加工的耗时,而且多色丝印可同时进行,降低了丝印的出错率,而制备的铝基材丝印产品着色牢固,手感平滑无凸纹,在丝印工艺领域具有极大的价值。(The invention discloses a silk-screen process for replacing multicolor oxidation, which comprises the following steps: firstly, grinding and polishing an aluminum substrate to remove an oxide layer and other impurities on the surface of the aluminum substrate; secondly, removing oil stains on the aluminum substrate by alkaline washing; polishing by chemical liquid to improve the brightness of the surface of the aluminum substrate; forming an oxide layer on the surface of the aluminum substrate through electro-oxidation; step five, penetrating a plurality of kinds of preset printing ink with different colors on the aluminum substrate into corresponding preset areas at one time through silk screen printing; and step six, carrying out electrooxidation hole sealing on the screen-printed aluminum substrate through a hole sealing agent. The relief-free silk-screen process provided by the invention greatly shortens the process of multicolor oxidation silk-screen, reduces the time consumption of processing, can simultaneously carry out multicolor silk-screen, reduces the error rate of silk-screen, and the prepared aluminum substrate silk-screen product is firm in coloring, smooth in hand feeling and free of relief, thereby having great value in the field of silk-screen process.)

1. A silk-screen process for replacing multicolor oxidation is characterized by comprising the following steps:

firstly, grinding and polishing an aluminum substrate to remove an oxide layer and other impurities on the surface of the aluminum substrate;

secondly, removing oil stains on the aluminum substrate by alkaline washing;

polishing by chemical liquid to improve the brightness of the surface of the aluminum substrate;

forming an oxide layer on the surface of the aluminum substrate through electro-oxidation;

step five, penetrating a plurality of kinds of preset printing ink with different colors on the aluminum substrate into corresponding preset areas at one time through silk screen printing;

and step six, carrying out electrooxidation hole sealing on the screen-printed aluminum substrate through a hole sealing agent.

2. The screen printing process replacing multicolor oxidation according to claim 1, characterized in that: and fourthly, the oxide layer is a porous structure oxide film with micropores distributed thereon.

3. The screen printing process instead of multicolor oxidation according to claim 2, characterized in that: and fifthly, filling the printing ink into the fine holes of the oxide film during silk-screen printing of the printing ink.

4. The screen printing process instead of multicolor oxidation according to claim 3, characterized in that: the ink acts only on the oxide film.

5. The screen printing process instead of multicolor oxidation according to claim 4, characterized in that: the ink is a permeable small molecule ink.

6. The screen printing process replacing multicolor oxidation according to claim 1, characterized in that: and a cleaning procedure is also included between every two adjacent steps, and the cleaning procedure adopts clean water for cleaning.

Technical Field

The invention relates to a silk-screen process, in particular to a silk-screen process replacing multicolor oxidation.

Background

The conventional aluminum base material non-relief silk screen printing adopts a multicolor oxidation process for dyeing, wherein the multicolor oxidation process comprises the steps of firstly removing impurities, degreasing and polishing the aluminum base material, then accurately covering a pre-colored area, and oxidizing other areas to form an oxide layer. Since only one color can be oxidized at a time in the coloring oxidation, each area needs to be repeatedly covered and cleaned in the multicolor oxidation, and the process is very complicated and takes a long time. Moreover, as the number of the working procedures is large, the oxidation failure of the product is caused when any coloring oxidation working procedure is in a problem in the processing process, and the fault rate is also the root cause of the improvement of the error rate under multiple working procedures, so the production cost is high.

Disclosure of Invention

In view of the above, the present invention provides a screen printing process instead of multicolor oxidation.

A silk-screen process replacing multicolor oxidation comprises the following steps:

firstly, grinding and polishing an aluminum substrate to remove an oxide layer and other impurities on the surface of the aluminum substrate;

secondly, removing oil stains on the aluminum substrate by alkaline washing;

polishing by chemical liquid to improve the brightness of the surface of the aluminum substrate;

forming an oxide layer on the surface of the aluminum substrate through electro-oxidation;

step five, penetrating a plurality of kinds of preset printing ink with different colors on the aluminum substrate into corresponding preset areas at one time through silk screen printing;

and step six, carrying out electrooxidation hole sealing on the screen-printed aluminum substrate through a hole sealing agent.

Further, the oxide layer in the fourth step is a porous structure oxide film with micropores distributed thereon.

And fifthly, filling the printing ink into the fine holes of the oxide film during silk-screen printing of the printing ink.

Further, the ink acts only on the oxide film.

Further, the ink is a permeable small molecule ink.

Furthermore, a cleaning procedure is also included between every two adjacent steps, and the cleaning procedure adopts clean water for cleaning.

Has the advantages that:

the relief-free silk-screen process provided by the invention greatly shortens the process of multicolor oxidation silk-screen, reduces the time consumption of processing, can simultaneously carry out multicolor silk-screen, reduces the error rate of silk-screen, and the prepared aluminum substrate silk-screen product is firm in coloring, smooth in hand feeling and free of relief, thereby having great value in the field of silk-screen process.

Drawings

FIG. 1 is a view showing a microstructure of an oxide film on an aluminum substrate;

FIG. 2 is a sectional microstructure of an oxide film of an aluminum substrate.

Detailed Description

In order to facilitate understanding for those skilled in the art, the present invention will be described in further detail below with reference to examples:

the embodiment provides a silk-screen process for replacing multicolor oxidation, which comprises the following steps:

firstly, grinding and polishing an aluminum substrate to remove an oxide layer and other impurities on the surface of the aluminum substrate;

secondly, removing oil stains on the aluminum substrate by alkaline washing;

polishing by chemical liquid to improve the brightness of the surface of the aluminum substrate;

forming an oxide layer on the surface of the aluminum substrate through electro-oxidation;

step five, penetrating a plurality of kinds of preset printing ink with different colors on the aluminum substrate into corresponding preset areas at one time through silk screen printing;

and step six, carrying out electrooxidation hole sealing on the screen-printed aluminum substrate through a hole sealing agent.

Firstly, mechanically grinding and polishing an aluminum substrate to remove an oxide layer and other impurities on the surface of the aluminum substrate; the purpose of mechanical polishing is to remove microscopic projections on the surface of the aluminum substrate by means of the cutting action of an abrasive material in order to remove the rough portions and the original scratches on the surface of the aluminum substrate.

And step two, selecting NaOH solution to carry out alkali washing treatment, wherein the concentration of NaOH is 35-40g/l, the alkali washing time is 1-2min, removing oil stains on the aluminum substrate by alkali washing, and removing the two types of oil stains on the surface of the aluminum substrate by means of saponification of alkali liquor on saponifiable oil stains and emulsification of surfactant on nonsaponifiable oil stains.

And step three, polishing the surface of the aluminum substrate by using chemical liquid medicine to improve the brightness of the surface of the aluminum substrate, wherein the polishing reagent is HT431 smokeless diacid chemical polishing high-brightness brightener, the temperature of the solution is controlled to be 90-115 ℃, the polishing time is 2-4min, the surface roughness of the aluminum substrate is reduced by the autolysis of the aluminum substrate in an electrolyte solution, and the aluminum substrate polishing agent has the advantages of high polishing speed and low processing cost in production, and meanwhile, the acid polishing can neutralize and clean the alkaline washing residues.

And step four, introducing uniform bubbles into the bottom of the electric oxidation tank to promote uniform oxidation, preventing the bubbles from adhering to the surface of the product by adopting a vertical shaking mode, insulating and oxidizing, and forming a porous structure oxide film with micropores distributed on the surface of the aluminum substrate by electric oxidation, wherein the pore size is 10-40 nm. The microstructure of the oxide film is shown in fig. 1 and 2.

And fifthly, selecting easily permeable micromolecule ink, permeating a plurality of preset inks with different colors on the aluminum substrate into corresponding preset areas through screen printing, enabling the inks to permeate into the micropores of the oxide film, processing one color at a time, printing one color each time until the process color requirement reaches the standard, continuing screen printing the other color until all the pre-screen printing colors are finished, and then entering the next process.

The silk-screen printing process comprises the following steps:

(1) making a bottom plate of a printing pattern;

(2) sun exposure is carried out for 30-45 seconds, the negative film is required to be overhauled before exposure, and dust and stains are wiped off;

(3) developing, soaking the screen printing plate in warm water at 30 ℃ for 1-2min, and spraying tap water until the unexposed film is swelled until the patterns are completely clear;

(4) drying in a 40 ℃ oven;

(5) correcting and correcting plate with negative film

(6) Classifying the prepared printing ink according to colors, and sequentially printing the printing ink on an oxide film;

(7) drying in a 40 ℃ oven to solidify the ink permeating into the micropores of the oxide film.

And sixthly, carrying out electro-oxidation hole sealing on the screen-printed aluminum substrate through a transparent hole sealing agent, and sealing the micropores of the oxide film through the hole sealing agent.

And a cleaning procedure is further included between every two adjacent steps from the first step to the sixth step, the cleaning procedure adopts a clean water tank for cleaning, corresponding alkali washing tanks, polishing tanks, oxidation tanks and hole sealing tanks are arranged in the second, third, fourth and sixth steps, and the clean water tanks are respectively arranged in front of and behind the alkali washing tanks, the polishing tanks, the oxidation tanks and the hole sealing tanks for cleaning. The product is hung by a hanger when passing through a clean water tank, an alkali washing tank, a polishing tank, an oxidation tank and a hole sealing tank, and the product is moved to be immersed and taken out by the hanger in sequence.