AU2021105993A4 - Double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof - Google Patents

Double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof Download PDF

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AU2021105993A4
AU2021105993A4 AU2021105993A AU2021105993A AU2021105993A4 AU 2021105993 A4 AU2021105993 A4 AU 2021105993A4 AU 2021105993 A AU2021105993 A AU 2021105993A AU 2021105993 A AU2021105993 A AU 2021105993A AU 2021105993 A4 AU2021105993 A4 AU 2021105993A4
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organic
double
layer
lubricating
solid film
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Haitao DUAN
Kali Gu
Dan JIA
Jian Li
Jiesong TU
Lei Wei
Shengpeng ZHAN
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Wuhan Research Institute of Materials Protection
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Wuhan Research Institute of Materials Protection
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    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M145/00Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
    • C10M145/02Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M145/04Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol, aldehyde, ketonic, ether, ketal or acetal radical
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00Tools as parts of machines covered by this subclass
    • B21D37/18Lubricating, e.g. lubricating tool and workpiece simultaneously
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/14Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M103/00Lubricating compositions characterised by the base-material being an inorganic material
    • C10M103/06Metal compounds
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    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/02Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation
    • C10M107/04Polyethene
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/38Lubricating compositions characterised by the base-material being a macromolecular compound containing halogen
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M7/00Solid or semi-solid compositions essentially based on lubricating components other than mineral lubricating oils or fatty oils and their use as lubricants; Use as lubricants of single solid or semi-solid substances
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/06Metal compounds
    • C10M2201/065Sulfides; Selenides; Tellurides
    • C10M2201/066Molybdenum sulfide
    • C10M2201/0663Molybdenum sulfide used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022Ethene
    • C10M2205/0225Ethene used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/04Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10MLUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2213/00Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
    • C10M2213/06Perfluoro polymers
    • C10M2213/062Polytetrafluoroethylene [PTFE]
    • C10M2213/0623Polytetrafluoroethylene [PTFE] used as base material
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00Specified use or application for which the lubricating composition is intended
    • C10N2040/20Metal working
    • C10N2040/24Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10NINDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00Form in which the lubricant is applied to the material being lubricated
    • C10N2050/015Dispersions of solid lubricants
    • C10N2050/02Dispersions of solid lubricants dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating

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  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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  • Metallurgy (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
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  • Application Of Or Painting With Fluid Materials (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

This invention discloses double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof. A double-layer solid film comprises an organic lubricating layer coated on the surface of an aluminum alloy plate and a protective layer coated on the surface of the organic lubricating layer, wherein the organic lubricating layer comprises a lubricating property imparting agent A, an organic coating B as a binder of the lubricating property imparting agent And a wetting dispersant C for improving the dispersibility of the lubricating property imparting agent A. The protective layer is an organic coating D which can improve the acid and alkali corrosion resistance of the organic lubricating layer. Adding lubricating property imparting agent A and wetting dispersant C into organic coating B, mixing uniformly, coating on the surface of the material to be lubricated, naturally drying to form an organic lubricating layer, and coating organic coating D on the organic lubricating layer to form a double-layer solid film. The invention has good acid and alkali corrosion resistance, weather resistance, good lubricating property, easy removal after stamping, and protects the surfaces of plates and dies, and the formed parts have excellent surface quality.

Description

Double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof
TECHNICAL FIELD The invention belongs to the technical field of aluminum alloy sheet stamping forming auxiliary processing, and relates to a surface lubricating film for aluminum alloy sheet stamping forming processing, in particular relates to double-layer solid film pre coated on surface of stamping and forming plate and preparation method thereof.
BACKGROUND Due to the special requirements on strength, formability, surface accuracy, baking hardening and so on, it is easy to produce defects by simply transplanting the lubrication technology in the stamping forming of the original steel plate, which not only can not meet the manufacturing requirements, but also brings waste of resources and environmental pollution. At present, all countries in the world are strengthening the research on the basic problems of surface treatment and lubricating materials for automotive aluminum alloy plates, and have formed a series of lubricating material products with intellectual property rights. There is a big gap between the aluminum alloy panel sheet forming technology and the average level of developed countries. There are only a few researches and patents on the direct surface treatment and lubricating material coating at the end of aluminum plate rolling process, which are not suitable for large-scale production. Solid lubrication can not only reduce the forming force of aluminum alloy sheet, reduce defects, improve the smoothness of stamping parts, prolong the service life of dies, but also avoid pollution and failure caused by volatilization of lubricating oil, and realize clean production in stamping workshop. Solid lubricants used in stamping processing of automobile body panels have been used on a certain scale. However, in the process of large-scale industrial application, aluminum alloy stamping lubricant must meet the following requirements: 1. Good weather resistance and acid and alkali corrosion resistance. In the process of industrial production, stamping aluminum plates purchased in the same batch often need to meet the continuous production demand of several months, so the service life of lubricating layer coated on aluminum plates must be guaranteed to be more than several months. 2. The preparation process should not be too complicated. Too complicated coating process will not only increase the cost of industrial application, but also easily lead to various defects in the coating process. 3. The lubricating medium should have excellent dispersibility in the solid binder. The research results of many scholars show that the dispersion of lubricating medium in solid lubricant will have a difference in stamping lubrication effect, and this difference will directly affect the formability of aluminum alloy sheet. 4. After stamping, it must have good removability. Stamping production is an intermediate process of automobile body panel manufacturing. In order not to affect the quality of subsequent painting and welding processes, the applied lubricant must be removed conveniently and quickly without residue. However, these problems are not fully considered in the current invention of solid lubricants for stamping aluminum alloy sheets. CN100509181C, for example, discloses a resin lubricating film containing polyethylene glycol and paraffin wax. Although, the lubricating film can provide better stamping lubrication performance, the preparation process is complicated, which is not conducive to large-scale industrial production, and the resin must be removed by alkali solution after stamping. However, aluminum alloy is easy to react with alkali solution, which leads to corrosion on the surface of formed parts and affects the surface quality of formed parts. In addition, the patent does not explain the dispersion of the lubricating agent. CN102808169A discloses a lubricating method for aluminum alloy. based on phosphating treatment of aluminum alloy, a sodium stearate layer is formed in fatty sodium as a lubricating effect. although this method improves the bonding force between phosphating layer and substrate, the treatment method is complicated and tedious, and the stamping lubrication performance of treated aluminum alloy is not evaluated in depth.
SUMMARY The invention aims to solve the problems in the background art. The invention provides double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof. A double-layer solid agent which can be stored for a long time and is resistant to acid and alkali corrosion is provided for the stamping forming of aluminum alloy plates. At the same time, the lubricant has simple preparation, uniform dispersion of lubricating medium and excellent lubricating performance. The double layer solid film has excellent acid and alkali corrosion resistance, weather resistance, stamping lubrication and forming performance, can effectively protect the surface of formed parts and can be easily removed after stamping forming. The technical scheme of the invention can be realized by the following technical measures: Double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof is characterized in comprising a lubricating property imparting agent A, an organic coating B as a binder of the lubricating property imparting agent And a wetting dispersant C for improving the dispersibility of the lubricating property imparting agent A, wherein the lubricating property imparting agent A, the organic coating B and the wetting dispersant C are respectively 10-30 parts by weight, -90 parts by weight and 0.2-2 parts by weight. And the protective layer is an organic coating D for improving the acid and alkali corrosion resistance of the organic lubricating layer. And the organic coating B is polyvinyl butyral, and the organic coating D is butadiene-styrene copolymer. Preferably, the lubricating property imparting agent a is selected from one or any combination of polytetrafluoroethylene particles, molybdenum disulfide particles and high molecular weight polyethylene particles. Preferably, the average particle size of the lubricating property imparting agent A is 0.5-3 microns. Preferably, the organic coating B is polyvinyl butyral. Preferably, the wetting and dispersing agent C is any one or combination of polymer carboxylic acid, modified polysiloxane and polymer surfactant. Preferably, The wetting dispersant C is preferably selected from any one of the Disponer 904S and Disponer903 produced by Elementis Specialties company. Preferably, the organic coating D is a butadiene-styrene copolymer.
The invention relates to double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof., which is characterized by comprising the following steps: Step 1: Adding lubricating property imparting agent A and wetting dispersant C into organic coating B in proportion, adding diluent for dilution, and then mixing by mechanical stirring to make lubricating property imparting agent A uniformly and fully dispersed to obtain precursor fluid. Step 2: Spraying or brushing the precursor fluid obtained in the step 1 on the surface of the material to be lubricated, and forming an organic lubricating layer after the surface of the material is naturally dry. Step 3: Adding the organic coating D into a diluent, fully stirring to completely dissolve the organic coating B, coating the diluted organic coating D on the surface of the organic lubricating layer prepared in step 2 by spraying or brushing, and forming the double-layer solid film after the organic coating D is naturally dried. Preferably, the diluent is an organic solvent, and the ratio of the adding amount of the diluent to the total mass of each component of the double-layer solid membrane is 0.6-1.1:1. Preferably, the coat thickness of that organic lubricating lay is 5-35 microns, and the coating thickness of the diluted organic coat D is 5-15 microns. Compared with the prior art, the invention has the following beneficial effects: (1) The raw materials of the double-layer solid film are simple, and the coating process is very simple. (2) The dispersion of lubricating medium in adhesive is the best, and there is basically no agglomeration phenomenon. (3) The double-layer solid film is resistant to strong acid and alkali corrosion, has good weather resistance and can be stored for a long time. (4) The stamping lubrication performance is excellent, which can effectively reduce the stamping force and die wear. (5) It has excellent protection ability to the surface of aluminum alloy plate, and the formed part has high surface quality.
(6) After forming, the double-layer solid film is easy to remove and basically has no residue.
BRIEF DESCRIPTION OF THE FIGURES The invention will be further explained by using the attached drawings, but the embodiments in the attached drawings do not constitute any limitation on the invention. Fig. 1 is a schematic structural diagram of an aluminum alloy punching cup sample coated with a double-layer solid film according to the present invention. Fig. 2 shows the dispersion of lubricating property imparting agent a in the solid lubricating layer of comparative embodiment 2. Fig. 3 shows the distribution of lubricating property imparting agent a in the section of solid lubricating layer of comparative example 2 (agglomeration is obvious). Fig. 4 shows the dispersion of lubricating property imparting agent a in the solid lubricating layer of embodiment 1 of the present invention. Fig. 5 shows the distribution of lubricating property imparting agent a in the section of solid lubricating layer in embodiment 1 of the present invention (the whole is smooth). Fig. 6 is a stroke curve of impact pressure of lubricants obtained in Comparative embodiment 1, Comparative embodiment 2 and embodiment 1. Reference number: 1- Protective layer, 2- Organic lubricating layer, 3- Aluminum alloy plate, 4- Lubricating property imparting agent A.
DESCRIPTION OF THE INVENTION The embodiment and working principle of the double-layer solid film produced by stamping and forming a pre-coated aluminum alloy sheet according to the present invention will be described in detail with reference to the attached drawings. The selection of test equipment and materials and the formulation of test parameters are only used to explain the technical scheme of the invention more clearly, but can not limit the protection scope of the invention. A double-layer solid film pre-coated on the surface of a stamping plate comprises an organic lubricating layer 2 coated on the surface of an aluminum alloy plate 3 and a protective layer 1 coated on the surface of the organic lubricating layer 2. The organic lubricating layer 2 includes lubricating property imparting agent A4, organic coating B as binder of lubricating property imparting agent and wetting dispersant C for improving dispersibility of lubricating property imparting agent A4, wherein the lubricating property imparting agent A4, organic coating B and wetting dispersant C are respectively 10-30 parts by weight, 70-90 parts by weight and 0.2-2 parts by weight. And the protective layer 1 is an organic coating d for improving the acid and alkali corrosion resistance of the organic lubricating layer 2. The lubricating property imparting agent A4 is selected from one or any combination of polytetrafluoroethylene particles, molybdenum disulfide particles and high molecular weight polyethylene particles. The average particle size is 0.5-3 microns, and that organic coat B is polyvinyl butyral. The wet dispersant C is any one or combination of polymer carboxylic acid, modified polysiloxane, their mixture and polymer surfactant; The wetting dispersant C is selected from any one of Disponer 904S and Disponer903 produced by Elementis Specialties Company. The organic coating d is a butadiene styrene copolymer. Preparation of double-layer solid membrane Degreasing, cleaning and drying the surface of aluminum alloy punching cup sample plate. Adding lubricating property imparting agent A and wetting dispersant C into organic coating B, adding diluent for dilution, and mechanically stir and mixing, wherein that weight percentage of each component meets the range of the invention. The coating method of the organic lubricating layer 2 of the present invention is not particularly limited, and dipping method, spraying method and other methods can be adopted, and it is noted that the coating thickness is between 5 and 35 microns. After coating, the lubricating layer is dried and solidified after naturally drying for 10 minutes at normal temperature. Then, the organic coating D is added into another diluent, completely dissolved by mechanical stirring, and evenly coated on the surface of the prepared solid lubricating layer by dipping method, spraying method or other methods to form a protective layer 1, the coating thickness of which is between 5 and 15 microns, and the double-layer solid film is prepared after natural surface drying at room temperature for minutes. Acid and alkali corrosion resistance and weather resistance test 34% concentrated hydrochloric acid and 20% sodium hydroxide solution were dripped on the surfaces of two aluminum alloy wafers coated with double-layer solid films through droppers. After standing for 15 minutes, the strong acid or strong alkali on the surfaces was washed away with clear water, and the surface state of the solid films was observed by naked eyes. Cupping test Before the cupping test, it is necessary to remove the outermost protective layer 1. Immerse the whole aluminum alloy wafer coated with double-layer solid film in xylene solvent, let it stand for 10 minutes at room temperature, take it out and air dry it naturally for 5 minutes, and then carry out subsequent cupping test. The GBW-50 cup punching test machine was used to carry out cupping test on the sample to be tested. the test parameters were as follows: comparative embodiment 1 (commercial liquid aluminum alloy stamping lubricating oil), comparative embodiment 2 (single layer polyurethane solid lubricating film) and embodiment (double layer solid film described in this invention), both of which were coated by brush coating under the same conditions. Set the cupping speed to 20mm/min and the blank holder force to 30KN. The aluminum alloy sheet enters the concave die under the action of the punch of the cupping test machine and gradually forms a cylindrical cup shape. Compared with the test punch pressure, the smaller punch pressure indicates excellent lubrication effect. Film removal ability test After the cupping test, the whole formed part was immersed in absolute ethyl alcohol, and stood for 15 minutes at room temperature. After taking it out and air-drying, the organic residue on the surface of the formed part was detected by infrared spectrometer. Comparative embodiment 1 The aluminum alloy wafer lubricated by commercial stamping oil QH-7 was selected for cup punching test. The experimental parameters and methods are as above. Physical and chemical properties of commercial QH-7 stamping oil are shown in Table 1.
Table 1 Physical and chemical properties of commercial QH-7 stamping oil
Type QH-7 Appearance Yellowish Liquid
Specific gravity 0.85±0.01
Flashing Point 185°C Viscosity grade 150 40C kinematic viscosity 33-35cst
Comparative embodiment 2 10 parts by mass of polytetrafluoroethylene particles with an average particle size of 2.8 microns are selected as lubrication imparting agent, 88.5 parts by mass of polyurethane is selected as organic coating, 1 part by mass of dispersant 904s is selected as wetting dispersant, and 0.5 part by mass of Defom 6500 is selected as defoaming agent. Embodiment: In the organic lubricating layer 2, polytetrafluoroethylene particles with an average particle size of 2.8 microns are selected in 15 parts by mass, polyvinyl butyral is selected in 83.5 parts by mass as an organic coating, dispersant 904s is selected in 1 part by mass as a wetting dispersant, and Defom 6500 is selected in 0.5 part by mass. The organic coating in the protective layer 1 is butadiene-styrene copolymer with 100 parts by mass. The prepared solid lubricating film was coated on the same aluminum alloy wafer samples as Comparative embodiment 1 and Comparative embodiment 2 for cup punching test. The dispersion of lubrication imparting agent was detected by Micromeasure2 white light confocal three-dimensional topography instrument produced by STIL Company of France, and the detection parameters were scanning area: 1 mmx 1 mm; Step size: 2pmx 5 pm. Depth of field of light pen: 300pm, the results are shown in Figs. 2-5, and the impact pressure stroke curves of this embodiment and comparative embodiment 1 and 2 are shown in Fig. 6.
The aluminum alloy cupping sample coated with the double-layer solid film by this invention has the color similar to that of the original aluminum alloy plate, and the quality of the solid film is obviously better than that of the sample coated with the single-layer polyurethane lubricating layer. 34% concentrated hydrochloric acid and 20% sodium hydroxide were dripped on the surfaces of two aluminum alloy cups coated with the double-layer solid film, and after standing for 15 minutes, the concentrated hydrochloric acid and sodium hydroxide were washed away with clear water, and it was found that the surface of the double-layer solid film was not damaged and had no color change, indicating that the double-layer solid film has excellent acid and alkali resistance. It can be seen from the results of Figs.2-5 and table 2 that the agglomeration size and density of the lubrication imparting agent in the embodiment are smaller than those in comparative embodiment 2, indicating that the dispersion of the lubrication imparting agent in the embodiment is obviously better than that in comparative embodiment 2. The results in Table 3 show that the solid lubricating layer prepared in Embodiment has better film-based adhesion than the solid lubricating layer prepared in Comparative embodiment 2. Table 2 Agglomeration size of lubrication imparting agents in comparative embodiment 2 and other embodiment.
Minimum Maximum measurement Jim measurement
Comparative 7 46 embodiment 2
Embodiment Cannot be measured 16
Table 3 Bonding force between solid lubricating film and aluminum alloy sheet in Comparative Embodiment 2 and Embodiment
Comparative Embodiment embodiment 2
Adhesive force /MPa 1.59 2.9
The aluminum alloy wafer coated with double-layer solid film was immersed in xylene solvent, and was taken out after standing for 15 minutes. After its natural surface dried, the cup forming test was carried out. The results in Fig. 6 and table 4 show that the maximum punching pressure of the lubricating layer in the cup punching process is obviously lower than that of comparative embodiment 1 in three stages of cup punching, which is not much different from that of comparative embodiment 2. The results show that the solid film of the present invention can provide excellent lubrication performance for the stamping process of aluminum alloy sheet 3. Cupping test is carried out after the cup punching sample coated with the double layer solid film of the invention is placed for one month, and the punching pressure basically has no change, which shows that the double-layer solid film has good weather resistance. Table 4 Maximum punching pressure of comparative embodiment 1, 2 and embodiments during cup forming
Comparative Embodiment 1 Comparative Embodiment 2 Embodiment
Stamping force /kN 32.37 25.08 27.20
The cup wall surface roughness of the molded parts of Comparative Examples 1 and 2 and Examples were measured and compared, and the results are shown in Table 5. It can be seen from the roughness results that the roughness Ra of the cup wall of the formed part is 0.9pm and Rz is 4.8pm when lubricated by QH-7 stamping oil, while the roughness Ra of the cup wall of the formed part in the embodiment is 0.2pm and Rz is 1.2pm, Compared with compaRative example 2, the ra value and Rz of QH-7 stamping oil decreased by about 77.8% and 75.0% respectively. It can be seen that under the lubrication of the solid film of the present invention, because the solid film has excellent lubrication performance, the surface of the plate is protected in the cup punching process, and the surface quality of the formed part is greatly improved. Table 5 Surface roughness of cup wall of molded parts of Comparative Example 1, Comparative Example 2 and this example
Lubrication condition Surface roughness Ra/pm Surface roughness Rz/pm Comparative 0.9 4.8 Embodiment 1 Comparative 0.2 1.2 Embodiment 2 Embodiment 0.2 1.2
The formed part coated with the lubricating layer of the invention is immersed in absolute ethyl alcohol solution after cup punching, and is taken out for natural air drying after standing for 15 minutes. Five areas are randomly detected on the surface of the formed part by infrared spectrometer, and no organic peaks appear, which shows that the lubricating layer of the invention is easy to remove and has no residue. Finally, it should be noted that the above embodiments are only used to illustrate the technical scheme of the present invention, but not to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical scheme of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical scheme of the present invention.

Claims (8)

  1. THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS: 1. Double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof is characterized in comprising a lubricating property imparting agent A, an organic coating B as a binder of the lubricating property imparting agent and a wetting dispersant C for improving the dispersibility of the lubricating property imparting agent A, wherein the lubricating property imparting agent A, the organic coating B and the wetting dispersant C are respectively 10-30 parts by weight, -90 parts by weight and 0.2-2 parts by weight. And the protective layer is an organic coating D for improving the acid and alkali corrosion resistance of the organic lubricating layer. And the organic coating B is polyvinyl butyral, and the organic coating D is butadiene-styrene copolymer.
  2. 2. Double-layer solid film, according to claim 1 is characterized in that the lubricating property imparting agent a is selected from one or any combination of polytetrafluoroethylene particles, molybdenum disulfide particles and high molecular weight polyethylene particles.
  3. 3. Double-layer solid film, according to claim 1 is characterized in that the average particle size of the lubricating property imparting agent A is 0.5-3 microns.
  4. 4. Double-layer solid film, according to claim 1 is characterized in that the wetting dispersant C is any one or combination of polymer carboxylic acid, modified polysiloxane and polymer surfactant.
  5. 5. Double-layer solid film, according to claim 1 is characterized in that the wetting dispersant C is selected from any one of Disponer 904S and Disponer903 produced by Elementis Specialties Company.
  6. 6. Double-layer solid film pre-coated on surface of stamping and forming plate and preparation method thereof is characterized in comprising the following steps: Step 1: Adding lubricating property imparting agent A and wetting dispersant C into organic coating B in proportion, adding diluent for dilution, and then mixing by mechanical stirring to make lubricating property imparting agent A uniformly and fully dispersed to obtain precursor fluid.
    Step 2: Spraying or brushing the precursor fluid obtained in the step 1 on the surface of the material to be lubricated, and forming an organic lubricating layer after the surface of the material is naturally dry. Step 3: Adding the organic coating D into a diluent, fully stirring to completely dissolve the organic coating B, coating the diluted organic coating D on the surface of the organic lubricating layer prepared in step 2 by spraying or brushing, and forming the double-layer solid film after the organic coating D is naturally dried.
  7. 7. The preparation method of double-layer solid film, according to claim 6, is characterized in that the diluent is an organic solvent, and the ratio of the adding amount of the diluent to the total mass of each component of the double-layer solid membrane is 0.6-1.1:1.
  8. 8. The preparation method of double-layer solid film, according to claim 6, is characterized in that the coat thickness of that organic lubricating lay is 5-35 microns, and the coating thickness of the diluted organic coat D is 5-15 microns.
    FIGURES -1/5-
    Figure 1
    -2/5- 19 Aug 2021 2021105993
    PTFE Agglomeration
    Figure 2
    -3/5- 19 Aug 2021
    Agglomeration measurement of lubrication imparting agent 2021105993
    Figure 3
    -4/5-
    Figure 4
    -5/5-
    Height (um) 19 Aug 2021 2021105993
    Length (um)
    Figure 5
    Comparative embodiment 1
    Embodiment
    Comparative embodiment 2 Stamping force
    Punch displacement
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