阅读说明：本技术 一种用于有隔板医用高效空气过滤器铝材料的制备方法 (Preparation method of aluminum material for medical efficient air filter with partition plate ) 是由 徐成志 万宝伟 任素贞 张彩龙 王毓玮 左源 于 2021-09-29 设计创作，主要内容包括：本发明公开了一种用于有隔板医用高效空气过滤器铝材料的制备方法,包括以下步骤,(1)合金成分制备：按照合金组成成分与质量百分比为：Fe＝0.4-0.5％,Si＝0.16-0.2％,Ti＝0.015-0.03％,Al＝≥99.2％进行制备、(2)铸轧、(3)开坯及热处理、(4)冷中轧、(5)箔轧成品轧制,本方法制备的用于有隔板医用高效空气过滤器铝材料相比于传统的牛皮纸做隔板材料,具有优异的耐热和耐湿性能,在厚度方面,铝箔隔板的厚度只有0.025-0.03mm,牛皮纸隔板在0.06mm,铝箔厚度减薄了50％以上,同时力学性能方面破裂强度也提升了2倍以上,在环境保护方面,铝箔作为清洁材料可以回收利用,符合国家提倡的碳中和碳达峰环保理念,该产品具有广泛的市场应用。(The invention discloses a preparation method of an aluminum material for a medical high-efficiency air filter with a partition plate, which comprises the following steps of (1) preparing alloy components: the alloy comprises the following components in percentage by mass: compared with the traditional kraft paper as a partition plate material, the aluminum material for the medical high-efficiency air filter with the partition plate prepared by the method has excellent heat resistance and humidity resistance, the thickness of the aluminum foil partition plate is only 0.025-0.03mm, the thickness of the kraft paper partition plate is 0.06mm, the thickness of the aluminum foil is reduced by more than 50%, the rupture strength in the aspect of mechanical property is also improved by more than 2 times, in the aspect of environmental protection, the aluminum foil can be recycled as a clean material, the aluminum foil conforms to the carbon neutralization carbon peak reaching environmental protection idea advocated by the state, and the aluminum material has wide market application.)

1. The preparation method of the aluminum material for the medical high-efficiency air filter with the partition plate is characterized by comprising the following steps of:

s1, preparing alloy components: the alloy comprises the following components in percentage by mass: 0.4-0.5% of Fe, 0.16-0.2% of Si, 0.015-0.03% of Ti and more than or equal to 99.2% of Al;

s2, casting and rolling: leveling the alloy in the S1 by aluminum, refining after 2-4 hours, adding a refining agent, turning over after determining that no scum exists on the surface of the aluminum liquid, and obtaining a cast-rolled coil with 1-level uniform crystal grains on the upper and lower plate surfaces by a cast-rolling process;

s3, cogging and heat treatment: the cast-rolling coil obtained in S2 is rolled, the roughness of a working roll Ra0.5-0.7, the uncoiling tension and the coiling tension are 0.8-1.0kg/mm²Rolling at the rolling speed of 200-300m/min for 2 passes, then performing heat treatment, welding an outer ring, tightening a steel strip on the plate surface, and performing homogenization annealing in a high-temperature annealing furnace to obtain a semi-finished product;

s4, cold medium rolling: rolling the semi-finished product obtained in the step S3 to 0.5-0.6mm, performing an edge cutting and finishing process by a slitting machine, checking the quality of the plate surface in the finishing process, and after finishing, rolling the plate to a cold rolling mill for rolling by 0.2-0.3 mm;

s5, foil rolling finished product rolling: transferring the material in the S4 to a foil rolling mill for finish rolling, wherein the roughness of a working roll is Ra0.12-0.17, the rolling speed is 850-950m/min, and the rolling force is 170-180t, and obtaining the finished aluminum foil with the thickness of 0.025-0.03 mm.

2. The method for preparing the aluminum material for the medical high-efficiency air filter with the partition according to claim 1, wherein the content of Fe and the content of Si in S1 are 2.5.

3. The method for preparing an aluminum material for a medical high efficiency air filter with a partition according to claim 1, wherein in S2, the amount of the refining agent is 1.5-1.8kg per ton of molten aluminum, and the grain size is checked by EBSD sample of cast-rolled plate, wherein the grain diameter ratio of the surface layer to the center 1/3 of the cast-rolled plate is 0.08-0.1, and the grain diameter ratio of the middle part of the cast-rolled plate is 0.12-0.15.

4. The method for preparing the aluminum material for the medical high-efficiency air filter with the partition board as claimed in claim 1, wherein in S3, the homogenization annealing is carried out in a high-temperature annealing furnace, the temperature is raised to the target heating temperature of 420 and 480 ℃ at the rate of 0.015 to 0.02 ℃/S, the temperature is kept for 5 to 8 hours after the target heating temperature is reached, and the aluminum coil is air-cooled after being taken out of the furnace, so that the semi-finished product of the aluminum coil is obtained.

5. The method for preparing an aluminum material for a medical high-efficiency air filter with a partition according to claim 1, wherein the water content of the rolling oil in S4 is 120ppm or less.

6. The method of manufacturing an aluminum material for a medical high efficiency air filter with a partition according to claim 1, wherein the finished aluminum foil obtained in S5 is tested for heat and moisture resistance index by placing the aluminum foil and the kraft paper in an oven at 60-180 ℃ for 90min, and then performing a rupture strength test, and the moisture resistance test is performed by placing the finished aluminum foil and the kraft paper in water at 25 ℃ for 30-90min and then performing a rupture strength test.

Technical Field

The invention relates to the technical field of preparation processes of aluminum materials, in particular to a preparation method of an aluminum material for a medical high-efficiency air filter with a partition plate.

Background

As new crown epidemics spread worldwide, people demand higher and higher quality air. The high-efficiency air filter is popular as the mainstream special air treatment equipment in the current market, and simultaneously, higher requirements are put forward for indexes of the high-efficiency air filter. The high-efficiency filter with the partition board on the market is formed by using superfine fibers as filter materials, using high-quality kraft paper for hot rolling forming to manufacture the partition board and combining the partition board with a wood frame or aluminum alloy frame glue, and has the advantages of high filtering efficiency, low resistance and large air volume.

However, in the environment with large air humidity or large temperature difference in hospital or medical laboratory, the kraft paper thermal rolling formed partition plate shrinks under the influence of cold, hot, dry and wet, the rupture strength changes under the heat-resistant and moisture-resistant conditions, the partition plate fails, and thus particles are emitted, air pollution is caused, and the air filter fails. Secondly, due to the performance problems of kraft paper, the partition plate is generally 0.06mm thick, and the area for installing the filter element is reduced in the limited size space of the filter. Finally, the kraft paper manufacturing process belongs to a highly polluting industry, which causes great pollution to the ecological environment.

Disclosure of Invention

The invention aims to solve the defects of the prior art, and provides a preparation method of an aluminum material for a medical high-efficiency air filter with a partition plate, which is specifically shown as follows:

a preparation method of an aluminum material for a medical high-efficiency air filter with a clapboard comprises the following steps:

s1, preparing alloy components: the alloy comprises the following components in percentage by mass: 0.4-0.5% of Fe, 0.16-0.2% of Si, 0.015-0.03% of Ti and more than or equal to 99.2% of Al;

s2, casting and rolling: leveling the alloy in S1 by aluminum, refining for 2-4 hours, adding a refining agent, turning over after determining that no scum exists on the surface of the aluminum liquid, and obtaining a cast-rolled coil with 1-level uniform upper and lower plate surface grains by a cast-rolling process;

s3, cogging and heat treatment: the cast-rolling coil obtained in S2 is rolled, the roughness of a working roll Ra0.5-0.7, the uncoiling tension and the coiling tension are 0.8-1.0kg/mm²Rolling at the rolling speed of 200-300m/min for 2 passes, then performing heat treatment, welding an outer ring, tightening a steel strip on the plate surface, and performing homogenization annealing in a high-temperature annealing furnace to obtain a semi-finished product;

s4, cold medium rolling: rolling the semi-finished product obtained in the step S3 to 0.5-0.6mm, performing an edge cutting and finishing process by a slitting machine, checking the quality of the plate surface in the finishing process, and after finishing, rolling the plate to a cold rolling mill for rolling by 0.2-0.3 mm;

s5, foil rolling finished product rolling: transferring the S4 material to a foil rolling mill for finish rolling, wherein the roughness of a working roll is Ra0.12-0.17, the rolling speed is 850-.

Preferably, in S1, Si content is 2.5.

Preferably, in S2, the amount of the refining agent is 1.5-1.8kg per ton of molten aluminum, and the grain size is checked by an EBSD sample prepared from a cast-rolled plate, wherein the grain diameter ratio of the surface layer to the center 1/3 of the cast-rolled plate is 0.08-0.1, and the grain diameter ratio of the middle part of the cast-rolled plate is 0.12-0.15.

Preferably, in S3, performing homogenizing annealing in a high-temperature annealing furnace, heating to the target heating temperature of 420-480 ℃ at the speed of 0.015-0.02 ℃/S, keeping the temperature for 5-8h after reaching the target heating temperature, and air-cooling after discharging to obtain the semi-finished product of the aluminum coil.

Preferably, the rolling oil has a water content of 120ppm or less in S4.

Preferably, the finished aluminum foil obtained in S5 is subjected to a heat and moisture resistance index test by placing the aluminum foil and the kraft paper in an oven at 60-180 ℃ for 90min, and then performing a rupture strength test by soaking the finished aluminum foil and the kraft paper in water at 25 ℃ for 30-90 min.

Has the advantages that:

(1) compared with the traditional kraft paper used as the partition material, the aluminum material for the medical efficient air filter with the partition plate prepared by the method has the advantages that the aluminum foil partition plate has excellent heat resistance and humidity resistance, the rupture strength of the aluminum foil partition plate is improved by 2-3 times compared with that of the kraft paper partition plate under the heat resistance condition, the rupture strength of the aluminum foil partition plate is unchanged under the humidity resistance environment, the rupture strength of the kraft paper partition plate is reduced along with the soaking time, and the rupture strength of the aluminum foil partition plate is improved by more than 2 times compared with that of the kraft paper partition plate.

(2) In the aspect of thickness, the thickness of the aluminum foil partition plate is only 0.025-0.03mm, the thickness of the kraft paper partition plate is 0.06mm, the thickness of the aluminum foil is reduced by more than 50%, and meanwhile, the rupture strength in the aspect of mechanical property is also improved by more than 2 times.

(3) In the aspect of environmental protection, the aluminum foil can be recycled as a cleaning material, the carbon neutralization carbon peak-reaching environmental protection concept advocated by the state is met, and the product has wide market application.

Detailed Description

For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not to be construed as limiting the scope of the present invention.

The first embodiment is as follows:

(1) preparing alloy components: according to the content of Fe: the content of Si is 2.5 (weight percentage), and the content of Fe is 0.4%, the content of Si is 0.16%, the content of Ti is 0.015%, the content of aluminum is 99.425%, wherein the sum of the weight percentage of Fe, Si, Ti, Al is 100%. And (4) carrying out alloy element proportioning.

(2) Casting and rolling: proportioning the alloys in the step (1) according to a proportion, carrying out a refining process 2-4 hours after a smelting furnace is subjected to aluminum leveling, adding 1.5kg of refining agent into each ton of molten aluminum for refining, and carrying out a converter turning process when scum is not visible on the surface of the molten aluminum visually. Then obtaining a cast-rolling coil with 1-level uniform crystal grains on the upper and lower plate surfaces through a cast-rolling process; and (3) checking the grain size of the cast-rolled coil by using an EBSD sample manufactured by a metal phase, wherein the grain diameter ratio of the surface layer to the center 1/3 of the cast-rolled plate is 0.08, and the grain diameter ratio of the middle part of the cast-rolled plate is 0.12.

(3) Cogging and hot spotProcessing: rolling the cast-rolling coil obtained in the step (2) with the roughness of a working roll Ra0.5 and controlling the uncoiling tension and the coiling tension to be 0.8kg/mm²The rolling speed is 200m/min, and heat treatment is carried out after 2 passes of rolling. And (3) welding an outer ring, tightening a steel belt on the surface of the steel belt, carrying out homogenization annealing in a high-temperature annealing furnace, heating to the target heating temperature of 420 ℃ at the speed of 0.015 ℃/s, keeping the temperature for 8 hours after the target heating temperature is reached, and carrying out air cooling after discharging to obtain a semi-finished product of the aluminum coil.

(4) Cold medium rolling: rolling the semi-finished product obtained in the step (3) to 0.5mm, performing an edge cutting and finishing process by a slitting machine, and checking the plate surface quality in the finishing process; after finishing, the coil is transferred to a cold rolling mill for rolling for 0.2 mm. Wherein the water content of the rolling oil is controlled at 100 ppm.

(5) Rolling of foil rolled products: transferring the material obtained in the step (4) to a foil rolling mill for finish rolling, wherein the roughness of a working roll is Ra0.12, the rolling speed is 850m/min, and the rolling force is controlled at 170t, so that the finished aluminum foil with the thickness of 0.025mm is obtained.

The finished product of the aluminum material for the high-efficiency air filter with the partition plate, which is obtained by the preparation method, has the rupture strength of 180 KPa. Under the same conditions of heat resistance and moisture resistance, the rupture strength of the aluminum foil separator is improved by more than 2 times compared with that of a kraft paper separator.

The heat resistant rupture strength of the aluminum foil and kraft paper is shown in the following table:

the moisture resistance rupture strength of the aluminum foil and kraft paper at 25 ℃ water temperature is shown in the following table:

example two:

(1) preparing alloy components: according to the content of Fe: the content of Si is 2.5 (weight percentage), and the content of Fe is 0.5%, the content of Si is 0.2%, the content of Ti is 0.03%, the content of aluminum is 99.27%, wherein the sum of the weight percentage of Fe, Si, Ti and Al is 100%. And (4) carrying out alloy element proportioning.

(2) Casting and rolling: proportioning the alloys in the step (1) according to a proportion, carrying out a refining process 4 hours after the aluminum is leveled in a smelting furnace, adding 1.8kg of refining agent into each ton of molten aluminum for refining, and carrying out a converter reversing process when the floating slag can not be seen on the surface of the molten aluminum visually. Then obtaining a cast-rolling coil with 1-level uniform crystal grains on the upper and lower plate surfaces through a cast-rolling process; and (3) checking the grain size of the cast-rolled coil by using an EBSD sample manufactured by a metallographic structure, wherein the grain diameter ratio of the surface layer to the center 1/3 of the cast-rolled plate is 0.1, and the grain diameter ratio of the middle part of the cast-rolled plate is 0.15.

(3) Cogging and heat treatment: rolling the cast-rolling coil obtained in the step (2) with the roughness of a working roll Ra0.7 mu m and the uncoiling tension and the coiling tension controlled at 1.0kg/mm²The rolling speed is 300m/min, and heat treatment is carried out after 2 passes of rolling. And welding the outer ring, tightening the steel belt on the surface of the steel belt, carrying out homogenization annealing in a high-temperature annealing furnace, heating to the target heating temperature of 480 ℃ at the speed of 0.02 ℃/s, keeping the temperature for 5 hours after the target heating temperature is reached, and air-cooling after discharging to obtain a semi-finished product of the aluminum coil.

(4) Cold medium rolling: rolling the semi-finished product obtained in the step (3) to 0.6mm, performing an edge cutting and finishing process by a slitting machine, and checking the plate surface quality in the finishing process; after finishing, the coil is transferred to a cold rolling mill for rolling for 0.3 mm. Wherein the water content of the rolling oil is controlled at 80 ppm.

(5) Rolling of foil rolled products: transferring the material obtained in the step (4) to a foil rolling mill for finish rolling, wherein the roughness of a working roll is Ra0.17, the rolling speed is 950m/min, and the rolling force is controlled at 180t, so that the finished aluminum foil with the thickness of 0.03mm is obtained.

The finished product of the aluminum material for the high-efficiency air filter with the partition plate, which is obtained by the preparation method, has the rupture strength of 200 KPa. Under the same conditions of heat resistance and moisture resistance, the rupture strength of the aluminum foil separator is improved by more than 2 times compared with that of a kraft paper separator.

The heat resistant rupture strength of the aluminum foil and kraft paper is shown in the following table:

the moisture resistance rupture strength of the aluminum foil and kraft paper at 25 ℃ water temperature is shown in the following table:

example three:

(1) preparing alloy components: according to the content of Fe: the content of Si is 2.5 (weight percentage), and the content of Fe is 0.45%, the content of Si is 0.18%, the content of Ti is 0.023%, the content of aluminum is 99.347%, wherein the sum of the weight percentages of Fe, Si, Ti and Al is 100%. And (4) carrying out alloy element proportioning.

(2) Casting and rolling: proportioning the alloys in the step (1) according to a proportion, refining for 3 hours after the aluminum is leveled in a smelting furnace, refining with a refining agent according to the proportion of 1.65kg/t of molten aluminum, and performing a converter reversing procedure after the scum is not visible on the surface of the molten aluminum visually. Then obtaining a cast-rolling coil with 1-level uniform crystal grains on the upper and lower plate surfaces through a cast-rolling process; and (3) checking the grain size of the cast-rolled coil by using an EBSD sample manufactured by a metal phase, wherein the grain diameter ratio of the surface layer to the center 1/3 of the cast-rolled plate is 0.09, and the grain diameter ratio of the middle part of the cast-rolled plate is 0.135.

(3) Cogging and heat treatment: and (3) rolling the cast rolling coil obtained in the step (2) to obtain an uncoiled blank, wherein the roughness of a working roll is Ra0.6 mu m, the uncoiling tension and the coiling tension are controlled to be 0.9kg/mm2, the rolling speed is 250m/min, and heat treatment is carried out after 2 passes of rolling. And welding an outer ring, tightening a steel belt on the surface of the steel belt, carrying out homogenization annealing in a high-temperature annealing furnace, heating to the target heating temperature of 450 ℃ according to the temperature of 0.018 ℃/s, keeping the temperature for 7 hours after the target heating temperature is reached, and air-cooling after discharging to obtain a semi-finished product of the aluminum coil.

(4) Cold medium rolling: rolling the semi-finished product obtained in the step (3) to 0.55mm, performing an edge cutting and finishing process by a slitting machine, and checking the plate surface quality in the finishing process; after finishing, the coil is transferred to a cold rolling mill for rolling for 0.25 mm. Wherein the water content of the rolling oil is controlled at 90 ppm.

(5) Rolling of foil rolled products: transferring the material obtained in the step (4) to a foil rolling mill for finish rolling, wherein the roughness of a working roll is Ra0.15, the rolling speed is 900m/min, and the rolling force is controlled at 175t, so that the finished aluminum foil with the thickness of 0.028mm is obtained.

The finished product of the aluminum material for the high-efficiency air filter with the partition plate, which is obtained by the preparation method, has the rupture strength of 190 KPa. Under the same conditions of heat resistance and moisture resistance, the rupture strength of the aluminum foil separator is improved by more than 2 times compared with that of a kraft paper separator.

The heat resistant rupture strength of the aluminum foil and kraft paper is shown in the following table:

the moisture resistance rupture strength of the aluminum foil and kraft paper at 25 ℃ water temperature is shown in the following table:

compared with the traditional kraft paper made partition board material, the aluminum foil partition board has excellent heat resistance and humidity resistance, the rupture strength of the aluminum foil partition board is improved by 2-3 times compared with that of the kraft paper partition board under the heat resistance condition, the rupture strength of the aluminum foil partition board is unchanged under the humidity resistance environment, the rupture strength of the kraft paper partition board is reduced along with the soaking time, and the rupture strength of the aluminum foil partition board is improved by more than 2 times compared with that of the kraft paper partition board. In the aspect of thickness, the thickness of the aluminum foil separator is only 0.025-0.03mm, in the aspect of 0.06mm of kraft paper separator, the thickness of the aluminum foil is reduced by more than 50%, and meanwhile, the rupture strength in the aspect of mechanical property is also improved by more than 2 times. The reason for improving the performance index of the material is mainly that the performance index is improved under the condition that the thickness of the aluminum foil material is reduced by organically combining the design aspect of the alloy, the accurate control of key parameters such as casting and rolling refining, the grain diameter ratio and the like, and the rolling parameters in the cold rolling process and the intermediate heat treatment process. In the aspect of environmental protection, the aluminum foil can be recycled as a cleaning material, the carbon neutralization carbon peak-reaching environmental protection concept advocated by the state is met, and the product has wide market application.

As a further improvement, the above-mentioned is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.