CN1125786A - Surface processing method of high-hardness aluminum or aluminum alloy tack-free pot - Google Patents
Surface processing method of high-hardness aluminum or aluminum alloy tack-free pot Download PDFInfo
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- CN1125786A CN1125786A CN 94113529 CN94113529A CN1125786A CN 1125786 A CN1125786 A CN 1125786A CN 94113529 CN94113529 CN 94113529 CN 94113529 A CN94113529 A CN 94113529A CN 1125786 A CN1125786 A CN 1125786A
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Abstract
The surficial treating method for non-adhering pot made up of high-hardness aluminium or aluminium alloy includes such technological steps as cleaning, baking, electrolytically hardening, sand blasting, cleaning again, coating, baking crystallization and shaping.
Description
The present invention relates to the surface treatment method of a kind of high hardness aluminium matter or aluminium alloy tack-free pot, it is more sturdy and durable and have a surface treatment method of not being stained with property and better high hardness aluminium matter of wear resistance or aluminium alloy tack-free pot particularly to relate to a kind of pan that makes.
The treatment process that in the past was applied to tack-free pot roughly has several method what follows:
(1) after sandblasting, handles through the hard anodizing epithelium more earlier: utilize high-pressure oxidation aluminium (Al earlier
2O
3) or steel ball, ram-jet is in the surface of pan, make pan produce diameter difference, deep mixed, uneven and shrinkage pool surface that thickness is uneven, utilize sulfuric acid, oxalic acid etc. in aluminum pot shrinkage pool surface again, with direct current or alternating current-direct current electrolysis, make the surface generate the porousness hardening oxidation epithelium that evenly adheres to and form.The treatment process of this kind pan can make the top layer of pan form one deck oxygen through epithelium, reaches the effectiveness of strengthening the pan structure, but in the use, can't bring into play the effect of not being stained with property.
(2) earlier after sandblasting again through the fluorocarbon resin processing treatment: utilize high-pressure oxidation aluminium (Al earlier
2O
3) or steel ball, ram-jet is in the surface of pan, make it produce diameter difference, deep mixed, uneven and shrinkage pool surface that thickness is uneven, be sprayed on the shrinkage pool surface in conjunction with different floating state suspension liquid fluorocarbon resins and form various again, the treatment process of this kind pan can make the top layer of pan form the not coat of being stained with property of one deck, the result of use of performance non-stick cooker, but can't reach robust effect on the structure.
(3) the third treatment process is the method that the step in conjunction with above-mentioned two kinds of treatment processs forms, and comprises that sandblasting, electrolytic oxidation and external coating handle, and as shown in Figure 1, is the cross-sectional schematic of pan surface after with sandblasting, earlier with aluminum oxide (Al
2O
3) or steel ball, impacting with high pressure sprays in the surface of pan 6, it is different with the depth to produce diameter, the shrinkage pool surface 61 uneven and thickness is uneven, enable afterwards coat (based on the material of fluorocarbon resin) is produced preferable bond or adheres to condition, as shown in Figure 2, be the cross-sectional schematic of pan surface after via sandblasting and electrolytic oxidation, the pan 6 on above-mentioned generation shrinkage pool surface 61 uses sulfuric acid, oxalic acid etc., with direct current or alternating current-direct current electrolysis, make shrinkage pool surface 61 form the porousness hardening oxidation epithelium 7 that evenly adheres to, this oxide scale film 7 is more level and smooth or circular-arc planes, as shown in Figure 3, be pan surface sand-blasting and electrolytic oxidation and the cross-sectional schematic after external coating is handled, it is to spray the coat 8 that one deck can adhere to mutually on oxide scale film 7 that this external coating is handled.
Though with the made tack-free pot of above-mentioned treatment process, than (1), (2) the kind method is sturdy and durable, and the pan surface has preferable not being stained with property, but the surface treatment process of this kind pan, handle through surface sand-blasting earlier, make the surface form the uneven surface uneven and the uneven bond area of thickness is big, and the coat that uneven surface sprays for desire has more bonded area and stronger bonding force, form hardening oxidation epithelium 61 through electrolytic oxidation again, make the uneven surface that painstakingly forms originally, forming one on the contrary is unfavorable for adhering to or the oxide scale film of the circular-arc or level and smooth shape of bond, make coat adhere to or bond power not good, cause wearing quality not good, difference of hardness; That is to say that the design of this kind surface treatment method does not only use the uneven surface condition that originally painstakingly forms, on the contrary this advantageous conditions is destroyed, be unfavorable for adhering to or the oxide scale film of the circular-arc or level and smooth shape of bond and form one.And, the pan body of aluminum or aluminum alloy material and the bonding force of coat, the sticking power of coat on the oxide scale film, this kind method is with the first electrolytic oxidation again after surface sand-blasting is handled of pan, at the formed hardening oxidation epithelium in pan surface, make coat directly to contact, and reduced sticking power and bonded area with the pan body of aluminum or aluminum alloy material.By last explanation as can be known, the made pan of the surface treatment method of pan was because coat was to be attached on the oxide scale film of circular-arc or level and smooth shape in the past, so sticking power is low, bonded area is little and because of the hardness of coat itself also very limited (reaching 2H approximately), just must stir gently during use with wooden slice or plastic cement slice, can not firmly scrub, scratch otherwise can peel off coat, lose the anti-effect of being stained with of non-stick cooker, very inconvenient in the use.
Purpose of the present invention, be to provide a kind of sturdy and durable, being stained with property is not good, and prolonged use coat can not peel off the high hardness aluminium matter that scratches or the surface treatment method of aluminium alloy tack-free pot yet.
The invention is characterized in: the surface preparation of this high hardness aluminium matter or aluminium alloy tack-free pot, be aluminium matter or the aluminium alloy pan that is shaped through punch die, handle, dry steps such as crystallization treatment, forming processes through purifying treatment, oven dry processings, the processing of electrolysis hard, sandblasting, purifying treatment, top layer application, make pan more sturdy and durable and being stained with property and wear resistance are not good.
The surface treatment method of high hardness aluminium matter of the present invention or aluminium alloy tack-free pot comprises following step:
(1) purifying treatment: with an aluminium matter or an aluminium alloy pan that is shaped through punch die, be immersed in the alkaline mixed solution groove that caustic soda (NaOH) adds water, after the immersion, again pan inserted Rinsing Area and soak, make pan surface degreasing;
(2) oven dry is handled: will be placed on through the pan that (1) step purge is finished dealing with in the stoving oven, and make the pan skin drying;
(3) the electrolysis hard is handled: will utilize the mixing acid of sulfuric acid, sal epsom, ferrous sulfate or other material through the pan surface that the oven dry of (2) step is finished dealing with, and with direct current or alternating current-direct current electrolysis, make the surface generate one deck hard magnalium ferroelectric oxide film;
(4) sandblasting: will be through the pan surface that (3) step electrolysis hard is finished dealing with, earlier with aluminum oxide powder (Al
2O
3), enamel fine sand, thick silicon steel sand or mix above material, spray surface with impacting with high pressure in pan, make the surface of pan produce the shrinkage pool surface that diameter is different with the depth, uneven and thickness is uneven, and magnalium iron hard anodic oxidation coating partly is interspersed in the pan of aluminium matter or aluminum alloy materials;
(5) purifying treatment: will clean up with the aluminium powder or the chiltern of high pressure gas through the pan that (4) step sandblasting is finished with the pan surface;
(6) the bottom application is handled: will contain the fluorocarbon resin suspension liquid of difference in conjunction with the floating state of number, be sprayed on the shrinkage pool surface of pan through the bottom application, it is infiltrated on the diameter concavo-convex hole inner and outer surface layers different with the depth, and the aluminium matter of close attachment pan or the interior skin that reaches magnalium iron hard anodic oxidation coating of aluminum alloy material, the coat of formation hardness;
(7) top layer sintering processes: will spray second layer fluorocarbon resin suspension liquid through the pan that (6) step bottom application is finished dealing with, and finish the coat of the second layer;
(8) shaping is handled: will take out stoving oven through the high temperature pan of (7) step top layer sintering processes, and directly cool off with high-power fan.
The present invention is described in detail below in conjunction with drawings and Examples:
Fig. 1 is the sectional view after the pan surface sand-blasting was handled in the past.
Fig. 2 is the cross-sectional schematic behind pan surface sand-blasting processing in the past and the electrolytic oxidation.
Fig. 3 is that the pan surface sand-blasting was handled and the cross-sectional schematic of electrolytic oxidation after external coating is handled in the past.
Fig. 4 is a block flow diagram of the present invention.
Fig. 5 is the cross-sectional schematic that pan of the present invention surface forms electrolytic oxide film.
Fig. 6 is that pan of the present invention surface forms the cross-sectional schematic of electrolytic oxide film after sandblasting.
Fig. 7 is that pan of the present invention surface forms the cross-sectional schematic of electrolytic oxide film after sandblast and bottom application and top layer sintering processes.
As shown in Figure 4, be schema of the present invention, step of the present invention comprises in regular turn: (1) purifying treatment (2) oven dry is handled (3) electrolysis hard and is handled (4) sandblasting (5) purifying treatment (6) top layer application processing (7) oven dry sintering processes (8) forming processes.
(1) purifying treatment: will-individual aluminium matter or the aluminium alloy pan that is shaped through punch die, in add the alkaline mixed solution that water forms by caustic soda (NaOH), soak (NaOH and water ratio were the best with 3: 1), and the temperature of alkaline mixed solution is with 50 ℃～70 ℃ the bests, after about 3～5 minutes of the soak time, again pan is inserted 50 ℃～70 ℃ Rinsing Area and soak and made pan surface degreasing in about 3～5 minutes and remove dirt.
(2) oven dry is handled: will be positioned over through the pan that (1) step purge is finished dealing with in about 200 ℃ stoving oven, drying is after about 3～5 minutes, with the pan skin drying.
(3) the electrolysis hard is handled: will utilize the mixing acid of sulfuric acid, sal epsom, ferrous sulfate or other material through the pan surface that the oven dry of (2) step is finished dealing with, with direct current or alternating current-direct current electrolysis, as shown in Figure 5, be that pan of the present invention surface forms the cross-sectional schematic of electrolysis oxygen through film, the present invention makes pan 9 surfaces generate the hard magnalium ferroelectric oxide film 10 of about 40-80 μ m of a layer thickness, in the step that this electrolysis hard is handled, the concentration of mix acid liquor is 100g/L～350g/L, electrolysis voltage is 20～40V, 2A/dm
2High electric current, temperature is-5 ℃～20 ℃.
(4) sandblasting: will be through pan 9 surfaces that (3) step electrolysis hard is finished dealing with, earlier with aluminum oxide (Al
2O
3) or steel ball, spray in the surface of pan 9 with impacting with high pressure, as shown in Figure 6, be that pan of the present invention surface forms electrolytic oxide film cross-sectional schematic after sandblasting, make pan 9 produce the oxide film uneven surface 11 that diameter is different with the depth, uneven and thickness is uneven, centre of surface average boldness (Ra) is 6～8 μ m, and about 25～60 μ m of the distance of peak and valley make hard magnalium iron hard anodic oxidation coating 10 form an oxide film uneven surface 11.Just different at this with in the past method, after handling, the present invention elder generation electrolysis hard carries out sandblasting again, produce one and help bond and the big oxide film uneven surface 11 of bonded area, can handle with (7) step top layer application good engaging force and big bonded area are arranged, and sandblasting produces surperficial shrinkage pool, and some has goed deep in pan 9 bodies, and can handle with (7) step top layer application have extraordinary bond intensity.
(5) purifying treatment: the pan 9 that will finish through (4) step sandblasting with high pressure gas with the aluminium powder on pan 9 surfaces, sandy cleaning up.
(6) the bottom application is handled: as shown in Figure 7, be that pan of the present invention surface forms the cross-sectional schematic of electrolytic oxide film after sandblast, bottom application and top layer sintering processes, this step will contain different floating state fluorocarbon resin suspension liquids in conjunction with number, with 0.5～3.5kg/cm
2Air source be sprayed on the oxide film uneven surface 11 of pan 9, directly enter temperature again and be 50～120 ℃ stoving oven, dried bean noodles 5 minutes, on the diameter that this fluorocarbon resin suspension liquid is infiltrated form on the body of pan 9 and the hard anodic oxidation coating 10 concavo-convex hole oxide film uneven surface 11 different with the depth, form one deck coat 12, these coat 12 thickness are 6～15 μ m, make in the aluminium matter of this coat close attachment pan 9 or the aluminum alloy material and on the oxide film uneven surface 11, and form a strong adhesion, bonded area is big and hardness is high coat 12.
(7) top layer sintering processes: as shown in Figure 7, to spray the fluorocarbon resin suspension liquid of the second layer through the pan 9 that (6) step bottom application is finished dealing with, placing temperature again is 150 ℃ stoving oven, oven dry through 10 minutes, promote temperature to 350～420 ℃ 5 minutes oven dry of do then, coat 13 thickness of the second layer that forms are 15～25 μ m.
(8) shaping is handled: will take out stoving ovens through the high temperature pan 9 that (7) step top layer sintering processes is finished, and directly force to be cooled to room temperature with high-power fan.
By following explanation as can be known, the present invention and in the past relatively more lower has following advantage:
(1) remake blasting treatment behind the first electrolytic oxidation, the present invention takes full advantage of each coat can be true Adhere in fact or bond in the condition of mother metal or bottom, pan body and nonstick layer are had more Bonded area and stronger adhesion make pan have sturdy and durable advantage with not being stained with effect concurrently.
(2) after electrolytic oxidation and blasting treatment, carry out again earlier the bottom application and process, make nonstick layer The hard anodic oxidation coating of close attachment pan also can partly infiltrate the pan body fully, more increases The adhesive force and the hardness that add nonstick layer.
(3) the bottom application is processed to dry to finish and is carried out the top layer sintering processes again, makes the pan body On nonstick layer better not being stained with property is arranged and also can remain on specific high hardness value.
(4) nonstick layer is take fluorocarbon resin as main coat, and by means of solvent and interface Activating agent holds a small amount of metal powder (such as the titanium powder) of interpolation or non-metal powder (such as ceramic powder) Easy and fluorocarbon resin mutually combines and is sprayed on the concavo-convex hole on pan top layer, and nonstick layer Hardness can reach 4H～8H, and is more a lot of than 2H increase in the past, so be not stained with effect and wear-resisting Property also increases relatively.
(5) adhesive force of nonstick layer, it is all good not to be stained with effect and wearability, can use general iron Shovel stirs and is convenient to scrub, and uses more convenient.
In sum, the surface preparation of high hardness aluminium matter of the present invention or aluminium alloy tack-free pot, Have make that pan is more sturdy and durable, the adhesive force of nonstick layer and the better advantage of wearability.
Claims (7)
1. the surface treatment method of high hardness aluminium matter or aluminium alloy tack-free pot, it is characterized in that: step that this surface preparation carries out is as follows in regular turn:
(1) purifying treatment: with an aluminium matter or an aluminium alloy pan that is shaped through punch die, be immersed in caustic soda (NaOH) and add in the alkaline mixed solution of water, after the immersion, again pan is inserted Rinsing Area and soak, make pan surface degreasing;
(2) oven dry is handled: will be placed on through the pan that (1) step purge is finished dealing with in the stoving oven, and make the pan skin drying;
(3) the electrolysis hard is handled: will utilize the mixing acid of sulfuric acid, sal epsom, ferrous sulfate or other material through the pan surface that the oven dry of (2) step is finished dealing with, and with direct current or alternating current-direct current electrolysis, make the surface generate one deck hard magnalium ferroelectric oxide film;
(4) sandblasting: will be through the pan surface that (3) step electrolysis hard is finished dealing with, earlier with aluminum oxide powder (Al
2O
3), enamel fine sand, thick silicon steel sand or mix above material, spray surface with impacting with high pressure in pan, make the surface of pan produce the shrinkage pool surface that diameter is different with the depth, uneven and thickness is uneven, and magnalium iron hard anodic oxidation coating partly is interspersed in the pan of aluminium matter or aluminum alloy materials;
(5) purifying treatment: will clean up with the aluminium powder or the chiltern of high pressure gas through the pan that (4) step sandblasting is finished with the pan surface;
(6) the bottom application is handled: will contain the fluorocarbon resin suspension liquid of difference in conjunction with the floating state of number, be sprayed on the shrinkage pool surface of pan through the bottom application, it is infiltrated on the diameter concavo-convex hole inner and outer surface layers different with the depth, and the aluminium matter of close attachment pan or the interior skin that reaches magnalium iron hard anodic oxidation coating of aluminum alloy material, form the good coat of hardness;
(7) top layer sintering processes: will spray second layer fluorocarbon resin suspension liquid through the pan that (6) step bottom application is finished dealing with, and finish the coat of the second layer;
(8) shaping is handled: will take out stoving oven through the high temperature pan of (7) step top layer sintering processes, and directly cool off with high-power fan.
2. the surface treatment method of high hardness aluminium matter as claimed in claim 1 or aluminium alloy tack-free pot is characterized in that:
In the purifying treatment of (1) step, this caustic soda and water ratio are 3: 1, and the temperature of alkaline groove mixed solution is 50 ℃～70 ℃, and soak time is 3～5 minutes, and the Rinsing Area temperature is 50 ℃～70 ℃, and soak time is 3～5 minutes.
3. the surface treatment method of high hardness aluminium matter as claimed in claim 1 or aluminium alloy tack-free pot is characterized in that:
During the oven dry of (2) step was handled, the temperature and time of oven dry was 200 ℃ and 3～5 minutes.
4. the surface treatment method of high hardness aluminium matter as claimed in claim 1 or aluminium alloy tack-free pot is characterized in that:
During the electrolysis hard of (3) step was handled, the hard magnalium iron-oxygen scale film thickness that the pan surface forms was 40～80 μ m, and the concentration of acid solution is 100g/L～350g/L, and electrolysis voltage is 20～40V, 2A/dm
2High electric current, temperature then is-5 ℃～20 ℃.
5. the surface treatment method of high hardness aluminium matter as claimed in claim 1 or aluminium alloy tack-free pot is characterized in that:
In (4) the step sandblasting, shrinkage pool centre of surface average boldness (Ra) is 6～8 μ m, and the distance of peak and valley is 25～60 μ m.
6. the surface treatment method of high hardness aluminium matter as claimed in claim 1 or aluminium alloy tack-free pot is characterized in that:
The stoving oven temperature of (6) step bottom sintering processes is 50～120 ℃, and drying time is 5～10 minutes, and the coat thickness that forms is 6～15 μ m.
7. the surface treatment method of high hardness aluminium matter as claimed in claim 1 or aluminium alloy tack-free pot is characterized in that:
(7) step top layer sintering processes be will finish dealing with through (6) step bottom application pan spray the fluorocarbon resin suspension liquid of the second layer, placing temperature again is 150 ℃ stoving oven, through oven dry in 10 minutes, promote temperature to 350～420 ℃ 5 minutes oven dry of do then, the coat thickness of the second layer that forms is 15～25 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94113529 CN1125786A (en) | 1994-12-26 | 1994-12-26 | Surface processing method of high-hardness aluminum or aluminum alloy tack-free pot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94113529 CN1125786A (en) | 1994-12-26 | 1994-12-26 | Surface processing method of high-hardness aluminum or aluminum alloy tack-free pot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1125786A true CN1125786A (en) | 1996-07-03 |
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ID=5036746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94113529 Pending CN1125786A (en) | 1994-12-26 | 1994-12-26 | Surface processing method of high-hardness aluminum or aluminum alloy tack-free pot |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060226C (en) * | 1997-04-29 | 2001-01-03 | 蔡东宏 | Surfacing method of making metal pot have high hardness, corrosion resistance and nonstickness |
| CN1060227C (en) * | 1997-04-29 | 2001-01-03 | 蔡东宏 | Surfacing method to obtain high hardness, nonstickness and corrosion resistance |
| CN1082417C (en) * | 1997-09-01 | 2002-04-10 | 普拉斯特隆株式会社 | Metal surface treatment method and metallic material treated thereby |
| CN101019742B (en) * | 2007-03-23 | 2010-05-19 | 严卫星 | Making process of antiwear nonstick cooker |
| CN101994141A (en) * | 2009-08-13 | 2011-03-30 | 通用汽车环球科技运作公司 | Methods of coating magnesium-based substrates |
| CN102133569A (en) * | 2011-03-29 | 2011-07-27 | 平顶山市新华区华锐电器厂 | Anti-corrosion paint coating method of aluminum alloy piece for power station |
| CN102871529A (en) * | 2012-08-27 | 2013-01-16 | 缙云县太极科技有限公司 | Aluminum alloy non-stick pan with hard surface and processing technology thereof |
| CN103173830A (en) * | 2011-12-24 | 2013-06-26 | 汤锦练 | Surface treatment method of aluminum product |
| CN103393355A (en) * | 2013-07-23 | 2013-11-20 | 浙江绍兴苏泊尔生活电器有限公司 | Pot and surface treatment method thereof |
| CN105088022A (en) * | 2015-08-13 | 2015-11-25 | 宁波格莱美厨具有限公司 | Aluminum alloy material for non-stick pan, aluminum alloy non-stick pan and preparation method for aluminum alloy material |
| EP2960017A1 (en) | 2014-06-23 | 2015-12-30 | Les Promotions Atlantiques Inc./ Atlantic Promotions Inc. | Method of treating a surface of a utensil |
| CN106175413A (en) * | 2016-08-22 | 2016-12-07 | 江苏金海玛电器有限公司 | A kind of manufacture method of non-stick pan tool |
| CN111957542A (en) * | 2020-08-11 | 2020-11-20 | 江苏万源新材料股份有限公司 | Coating aluminum foil with moisturizing function and preparation process thereof |
-
1994
- 1994-12-26 CN CN 94113529 patent/CN1125786A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060227C (en) * | 1997-04-29 | 2001-01-03 | 蔡东宏 | Surfacing method to obtain high hardness, nonstickness and corrosion resistance |
| CN1060226C (en) * | 1997-04-29 | 2001-01-03 | 蔡东宏 | Surfacing method of making metal pot have high hardness, corrosion resistance and nonstickness |
| CN1082417C (en) * | 1997-09-01 | 2002-04-10 | 普拉斯特隆株式会社 | Metal surface treatment method and metallic material treated thereby |
| CN101019742B (en) * | 2007-03-23 | 2010-05-19 | 严卫星 | Making process of antiwear nonstick cooker |
| CN101994141B (en) * | 2009-08-13 | 2013-02-06 | 通用汽车环球科技运作公司 | Methods of coating magnesium-based substrates |
| CN101994141A (en) * | 2009-08-13 | 2011-03-30 | 通用汽车环球科技运作公司 | Methods of coating magnesium-based substrates |
| CN102133569B (en) * | 2011-03-29 | 2013-09-11 | 洛阳师范学院 | Anti-corrosion paint coating method of aluminum alloy piece for power station |
| CN102133569A (en) * | 2011-03-29 | 2011-07-27 | 平顶山市新华区华锐电器厂 | Anti-corrosion paint coating method of aluminum alloy piece for power station |
| CN103173830A (en) * | 2011-12-24 | 2013-06-26 | 汤锦练 | Surface treatment method of aluminum product |
| CN102871529A (en) * | 2012-08-27 | 2013-01-16 | 缙云县太极科技有限公司 | Aluminum alloy non-stick pan with hard surface and processing technology thereof |
| CN103393355A (en) * | 2013-07-23 | 2013-11-20 | 浙江绍兴苏泊尔生活电器有限公司 | Pot and surface treatment method thereof |
| EP2960017A1 (en) | 2014-06-23 | 2015-12-30 | Les Promotions Atlantiques Inc./ Atlantic Promotions Inc. | Method of treating a surface of a utensil |
| CN105088022A (en) * | 2015-08-13 | 2015-11-25 | 宁波格莱美厨具有限公司 | Aluminum alloy material for non-stick pan, aluminum alloy non-stick pan and preparation method for aluminum alloy material |
| CN106175413A (en) * | 2016-08-22 | 2016-12-07 | 江苏金海玛电器有限公司 | A kind of manufacture method of non-stick pan tool |
| CN111957542A (en) * | 2020-08-11 | 2020-11-20 | 江苏万源新材料股份有限公司 | Coating aluminum foil with moisturizing function and preparation process thereof |
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