CN115558539B - Solid-liquid composite lubricating coating, preparation method and application - Google Patents
Solid-liquid composite lubricating coating, preparation method and application Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 65
- 239000011248 coating agent Substances 0.000 title claims abstract description 62
- 230000001050 lubricating effect Effects 0.000 title claims abstract description 56
- 239000007788 liquid Substances 0.000 title claims abstract description 34
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000011324 bead Substances 0.000 claims abstract description 42
- 239000011521 glass Substances 0.000 claims abstract description 42
- 239000003921 oil Substances 0.000 claims abstract description 41
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 28
- 239000000314 lubricant Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 10
- 239000003085 diluting agent Substances 0.000 claims abstract description 10
- 239000002270 dispersing agent Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 239000002243 precursor Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000009736 wetting Methods 0.000 claims abstract description 6
- 238000010907 mechanical stirring Methods 0.000 claims abstract description 4
- 230000001680 brushing effect Effects 0.000 claims abstract description 3
- 238000005507 spraying Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims description 20
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 12
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 12
- 239000002199 base oil Substances 0.000 claims description 8
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 7
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000007822 coupling agent Substances 0.000 claims description 4
- 238000005238 degreasing Methods 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 229920013639 polyalphaolefin Polymers 0.000 claims description 3
- 239000004705 High-molecular-weight polyethylene Substances 0.000 claims description 2
- 239000004642 Polyimide Substances 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 2
- 239000010696 ester oil Substances 0.000 claims description 2
- 239000002480 mineral oil Substances 0.000 claims description 2
- 235000010446 mineral oil Nutrition 0.000 claims description 2
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 2
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 2
- 239000004645 polyester resin Substances 0.000 claims description 2
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- 239000004814 polyurethane Substances 0.000 claims description 2
- 229920002545 silicone oil Polymers 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 abstract description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 14
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- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 102100028029 SCL-interrupting locus protein Human genes 0.000 description 1
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- 229910045601 alloy Inorganic materials 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
- C10M169/048—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution, non-macromolecular and macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/12—Glass
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
- C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/04—Macromolecular 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
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/06—Perfluoro polymers
- C10M2213/062—Polytetrafluoroethylene [PTFE]
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/04—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions having a silicon-to-carbon bond, e.g. organo-silanes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/20—Metal working
- C10N2040/24—Metal working without essential removal of material, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/20—Metal working
- C10N2040/244—Metal working of specific metals
- C10N2040/245—Soft metals, e.g. aluminum
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
Abstract
The invention discloses a solid-liquid composite lubricating coating, a preparation method and application thereof, wherein oil-containing glass beads, a lubricating property imparting agent and a wetting dispersing agent are added into a lubricant binder, a diluting agent is added, and the mixture is mixed in a mechanical stirring mode, and after the mixing is completed, a defoaming agent is added and the mixture is kept stand, so that the oil-containing glass beads and the lubricating property imparting agent are fully and uniformly dispersed to obtain a precursor fluid; spraying or brushing the precursor fluid on the surface of the material to be lubricated, and curing to form a solid-liquid composite lubrication coating after the surface is dried; the coating can be used for a regenerated aluminum alloy sheet material stamping forming lubricant layer. The invention overcomes the defects that the original lubrication system has lower bearing capacity and is difficult to be used for secondary aluminum forming, can realize solid-liquid composite lubrication under high load, provides better lubrication effect, and has the advantages of easy cleaning after processing, protecting the surfaces of plates and dies and improving forming quality.
Description
Technical Field
The invention belongs to the field of lubricating materials, relates to a stamping process lubricating material technology, and in particular relates to a solid-liquid composite lubricating coating, a preparation method and application.
Background
Aluminum alloy has become the second largest metal material for industrial application because of its advantages of small density, high strength, corrosion resistance and good processability. Because of the high recovery rate of aluminum and the production cost of the regenerated aluminum being far lower than that of electrolytic aluminum, the regenerated aluminum is gradually an important choice for stamping part application in the automobile industry. However, because the recovery source of the aluminum scraps is complex, the recovery process is not mature, the inherent defects caused by impurities are more, the performance of the regenerated aluminum plate is unstable, and particularly the plasticity of the thin plate is poor, so that the regenerated aluminum plate is difficult to be repeatedly applied to the wrought alloy. During the stamping process, the impurity phase defects and hole defects existing on the surface can affect the forming quality. Therefore, by developing a special lubrication process for the secondary aluminum, the improvement of the punching application performance of the secondary aluminum has important significance.
The regenerated aluminum alloy is different from the original aluminum alloy, and has more defects on the surface, so that extra abrasive particle abrasion and lubrication failure caused by hole defects due to impurity phase particle falling easily occur in the stamping process. The most widely used lubrication in current aluminum alloy stamping is oil lubrication. The lubricating oil has the functions of lubrication, cooling, rust prevention and the like. However, when the lubricant is not properly selected, lubrication failure is easy to occur, so that the workpiece is broken or surface defects such as scratches are generated on the surface of the workpiece. Moreover, the lubricating oil is easy to oxidize, volatilize and damage an oil film in high load, and the use temperature is limited. In addition, the defect existing on the surface of the regenerated aluminum can also cause uneven oil film thickness and loading, and unstable lubrication. Meanwhile, the solid lubrication can reduce the forming force of the aluminum alloy plate, reduce defects, improve the finish of stamping parts, prolong the service life of the die and avoid pollution and failure caused by volatilization of lubricating oil. However, the solid lubricant film has problems such as poor dispersibility of the lubricant, difficulty in removal after processing, and the like.
In the related research on aluminum alloy plate lubrication at present, a special lubrication method for the regenerated aluminum plate developed for the special surface defects of the regenerated aluminum alloy is lacking. For example, CN111334305A and CN111334300a disclose solid-liquid lubricants based on nano graphene and silica reinforced metal forming and a preparation method thereof, although the lubricants can provide better lubricating performance, the preparation process is complex, the nanoparticle cost is too high, the lubricants are not suitable for mass production, and meanwhile, the liquid-based lubrication system is affected by defects when being applied to secondary aluminum stamping, and the effect is poor. The lubricating film layers for aluminum alloy stamping disclosed by CN109054951A and CN109079420A are simple to prepare, the lubricating medium is uniformly dispersed, and the lubricating film layers have good corrosion resistance, weather resistance and formability, but the bearing capacity of the film layers is insufficient, and the surface defects of the reclaimed aluminum can influence the actual use effect.
Disclosure of Invention
The invention aims to solve the defects of the stamping lubrication technology of a regenerated aluminum alloy plate and provides a solid-liquid composite lubrication coating, a preparation method and application.
The technical scheme of the invention can be realized by the following technical measures:
The invention provides a solid-liquid composite lubricating coating, which comprises oil-containing glass beads, a lubricating property imparting agent, a lubricant binder, a wetting dispersing agent for improving the dispersibility of the lubricating property imparting agent and a defoaming agent for reducing excessive bubbles generated by fluid in the stirring process, wherein the lubricant binder is an elastic organic coating serving as the lubricant imparting agent binder.
The invention provides a preparation method of a solid-liquid composite lubricating coating, which is characterized by comprising the following steps of:
Step 1, adding oil-containing glass beads, a lubricating property imparting agent and a wetting dispersing agent into a lubricant binder, adding a diluting agent, mixing in a mechanical stirring mode, adding a defoaming agent after mixing, and standing to enable the oil-containing glass beads and the lubricating property imparting agent to be fully and uniformly dispersed to obtain a precursor fluid;
And 2, spraying or brushing the precursor fluid obtained in the step 1 on the surface of the material to be lubricated, and curing the surface of the material at 40 ℃ 000 ℃ for 400 hours after the surface is dried to form the solid-liquid composite lubricating coating.
As a preferable technical scheme, the oil-containing glass beads, the lubricating property imparting agent, the lubricant binder and the wetting dispersant are 2010 parts, 5-10 parts, 78-93 parts and 0.202 part by weight respectively.
As a preferable technical scheme, the oil-containing glass beads are prepared by soaking hollow glass beads in base oil.
Further preferably, the average particle diameter of the oil glass beads is 10050. Mu.m.
Further preferably, the base oil contained in the oil-containing glass beads is one or more of mineral oil, polyalphaolefin, ester oil and silicone oil.
Further preferably, the base oil can be added with additives such as extreme pressure antiwear agents, antifriction agents, antioxidants and the like.
As a preferable embodiment, the lubricity imparting agent is selected from one or more of polytetrafluoroethylene particles, molybdenum disulfide particles, polyimide particles and high molecular weight polyethylene particles.
Further preferably, the average particle diameter of the lubricity imparting agent is 0.5 to 3 μm.
As a preferable technical scheme, the defoaming agent is a solvent type defoaming agent, and the addition amount of the defoaming agent is 0.4-1 wt% of the solid film component.
Further preferably, the defoaming agent is a foam inhibiting and defoaming agent of modified polysilicone or modified polysiloxane or a mixture of the two.
Further preferably, the antifoaming agent is selected from any one of Defom 5400,Defom 5500,Defom 0500 produced by the sea name samite.
As a preferable technical scheme, the organic elastic coating is any one of elastic polyurethane, polyester resin, styrene-butadiene-styrene block copolymer and butyral resin.
Further preferably, the elongation at break of the resin formed by the organic elastic coating is 300% or more.
As a preferable technical scheme, the dispersing agent is any one or more of titanate coupling agent, aluminate coupling agent, silane coupling agent and high-molecular carboxylic acid; the dispersant is blended in advance or added to the resin for mixing according to the use method of the dispersant.
As a preferable technical scheme, the diluent is a surface paint diluent, and the ratio of the addition amount of the diluent to the total mass of the solid-liquid composite lubricating coating is 0.001.1:1.
As a preferable technical scheme, the surface of the material to be lubricated is coated after degreasing treatment, the thickness of the formed solid-liquid composite lubricating coating is 200200 mu m, and the thickness of the coating is larger than the average particle size of the oil-containing glass beads.
Further preferably, the thickness of the solid-liquid composite lubricating coating is 2-10 times of the average particle size of the oil-containing glass beads.
The invention also provides a solid-liquid composite lubricating coating, which is prepared by adopting the preparation method.
The precursor fluid is coated on the regenerated aluminum alloy plate after degreasing treatment to form a stamping forming lubricant layer for stamping forming processing of the regenerated aluminum alloy plate.
The core invention is to add oil-containing glass beads, and the action principle is as follows: the oil-containing glass beads are broken and release lubricating oil in the coating friction process, and form solid-liquid composite lubrication with solid lubricants, as shown in figure 1; the glass bead hardness is higher, plays the effect of reinforcing antifriction performance, and brittleness is big simultaneously, and is fragile easily, and the breakage plays energy-absorbing guard action for can not lead to the fact the damage to the aluminum alloy body in the punching press process, can release contained base oil after the punching press damage and can provide good lubrication environment again, can prevent effectively that the punching press in-process from being in contact with the lubricating film and from being away from the aluminum alloy body, causes the friction damage to the aluminum alloy body, provides continuous lubrication interface for punching press processing through the mode of two-stage lubrication, makes can improve the punching press speed under the condition that obtains good work piece surface morphology, reduces the defective work piece probability of occurrence.
The solid-liquid composite lubricating film obtained by the invention can also meet the requirements of having enough lubricating performance and protecting the regenerated aluminum alloy plate under the high-load stamping processing condition. Can adapt to the stamping forming process under larger forming force and form good protection for the aluminum alloy plate.
Compared with the prior art, the invention has the following beneficial effects:
(1) The wear resistance is excellent, the impact force can be borne greatly, and the influence of the surface defect of the recycled aluminum alloy on the contact surface of the die in the forming process is effectively reduced.
(2) The coating process of the lubricating coating is simple and convenient, and the quality of the coating is stable.
(3) The aluminum alloy plate has excellent protective capability on the surface of the aluminum alloy plate, and the formed part has higher surface quality.
(4) The solid lubricating film is easy to remove and has less residues.
Drawings
FIG. 1 shows the breakage of oil glass beads in a tribological test.
Fig. 2 shows the morphology of the oil glass beads and the distribution of particles in the coating, fig. 2 a shows the SEM of the oil glass beads, and fig. 2b shows the SEM of the solid-liquid composite lubricating coating of example 2.
Fig. 3 is a schematic view of dimensions of a cup-punching die in an embodiment.
Fig. 4 is a friction coefficient versus time curve for example 2 and comparative example 2.
Fig. 5 is a comparative graph of the coating failure conditions of example 2 and comparative example 2, in which a is an SEM of the solid-liquid composite lubricating coating failure conditions of example 2, and b is an SEM of the lubricating coating failure conditions of comparative example 2, in fig. 5.
Detailed Description
Before the present invention is described, it is to be understood that this invention is not limited to the particular embodiments described. All modifications directly derived or suggested by the person skilled in the art from the disclosure of the present invention are deemed to be within the scope of the present invention.
Examples:
The embodiment of the invention provides a preparation method and performance test of a solid-liquid composite lubricating coating formed by poly alpha olefin base oil glass beads and Polytetrafluoroethylene (PTFE) in polyvinyl butyral (PVB), which comprises the following steps:
And (3) preparing a coating:
1. pretreatment of a coating surface: degreasing, cleaning and drying (surface roughness 0.15 mu m) the 5052 regenerated aluminum alloy plate.
2. Preparing oil-containing glass beads: hollow glass beads with the average particle size of 30 mu m are selected, PAO40 base oil is soaked for 24 hours in a vacuum environment, and the oil-containing glass beads are prepared.
3. And (3) coating preparation: polyvinyl butyral resin is selected as a paint binder, and ethanol is selected as a diluent. Adding oil-containing glass beads and a silane coupling agent, and carrying out mechanical stirring for 1h on polytetrafluoroethylene superfine powder (average particle size of 2.8 mu m and density of 0.45g/cm 3) to prepare the PVB coating containing the glass beads and PTFE. Defom 0500 (0.5 wt%) was added as an antifoaming agent, and after standing, the mixture was brushed onto the surface of an aluminum alloy substrate, and after the surface was dried, the mixture was cured at 00℃for 4 hours to prepare a solid transparent coating film.
Coating Performance test
1. Characterization of the dispersion state: and observing the form of the oil-containing glass beads and the dispersion effect of the oil-containing glass beads and PTFE in the coating by a scanning electron microscope. The microscopic morphology of the oil-containing glass beads (FIG. 2 a) and the coating of example 2 (FIG. 2 b) were observed by scanning electron microscopy, the oil-containing glass beads having an average diameter of about 30 μm and a certain aggregation phenomenon between the beads. The oil-containing glass beads and PTFE particles are dispersed in the PVB coating, so that the dispersion effect is good, and the serious agglomeration phenomenon is avoided.
2. Tribology test: and (3) adopting a UMT-2 friction and wear testing machine, wherein the friction pair is a GCr15 bearing steel ball with the diameter of 4mm, and performing linear reciprocating friction movement with the pressure of 2N, the stroke of 5mm and the frequency of 4Hz for 20min. The longer the time required for the damage of the coating is, the stronger the bearing capacity and the abrasion resistance of the coating are compared with the time required for the damage of different coatings.
3. Cup punching test: the size of the die plate is shown in figure 3 by adopting a GBW-50 microcomputer control cup punching tester. The cup speed value was set at 20mm/min and the beading force was set at 30kN. The aluminum alloy plate enters the female die under the action of the male die of the cup punching tester, and a cylindrical cup shape is gradually formed. A Micromeasure white light confocal three-dimensional profiler manufactured by the company STIL in France scans the surface roughness of a region of 1mm multiplied by 1mm to compare the surface roughness of a formed piece, and the low surface roughness indicates that the lubrication effect is excellent.
Examples 1 to 0 were formed by varying the contents of oil glass beads and lubricity imparting agent in the solid-liquid composite lubricating coating, the contents of the components of each example being shown in table 1:
table 1 examples oil glass beads and PTFE content
Comparative example:
comparative example 1 is a commercially available QH-7 aluminum alloy stamping oil (flash point: 185 ℃ C.; viscosity grade: 150;40 ℃ C. Kinematic viscosity: 33035 cst), and the QH-7 stamping oil was brushed before performing the cup stamping test.
Comparative examples 2 and 3 are solid lubricating films free of oily glass microsphere components. The preparation method of the lubricating film is consistent with the examples, and the component content of each comparative example is shown in table 2:
table 2 oil glass beads and PTFE content for each comparative example
Test results:
In the tribology test, the coating damage is marked by the sharp fluctuation of the friction coefficient, and the time from the start of friction to the sharp fluctuation of the friction coefficient is the coating damage time as shown in fig. 4. Comparative example 1 was not a coating, and was not subjected to tribological test comparison. Results of the tribological test of the time required for coating failure are shown in Table 3, and the time required for coating failure is significantly greater for each example than for each comparative example, wherein examples 3, 4 and 5 perform better, demonstrating that the example coatings have good abrasion resistance. The damage condition of the solid-liquid composite lubricating coating (figure 5 a) of the example 4 and the solid lubricating coating (figure 5 b) of the comparative example 2 is observed through a scanning electron microscope, and the result is shown in figure 5, wherein the solid-liquid composite lubricating coating has small grinding marks, the damaged part has no edge tilting, the glass beads at the pressed part are damaged and release lubricating oil, and the bottom regenerated aluminum alloy plate has less abrasion and no obvious plastic deformation.
TABLE 3 tribological test time required for coating failure
The molded parts were tested by punching cups, and the molded parts were observed by photographing, so that the surface damage was less and the quality was better than that of the comparative examples. The comparative results of the surface roughness of the molded article obtained by the punching cup test are shown in Table 4, and the surface roughness of the other regenerated aluminum alloy molded articles pre-coated with the solid-liquid composite lubricating film is lower than that of the sheet material covered by the PTFE coating only, except for the example 0 in which the oil glass beads and the PTFE content are high. Compared with QH-7 aluminum alloy stamping oil, the surface roughness of the formed part can be reduced by 90% at most, and the lubricating effect is far higher than that of the stamping oil.
Table 4 surface roughness of molded article for cup punching test
From the results of the tribological test and the cup-punching test, it can be seen that the desired coating component contents are obtained in examples 3, 4 and 5. The coating film prepared under the condition of a certain proportion of each component has the advantages of strong bearing performance, strong wear resistance and good lubricating effect.
The above embodiments are only for illustrating the present invention, and are not limiting of the present invention. While the invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various combinations, modifications, and substitutions can be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The application of the solid-liquid composite lubricating coating is characterized in that the solid-liquid composite lubricating coating is used as a lubricant layer for stamping and forming of a regenerated aluminum alloy plate, and the preparation method of the solid-liquid composite lubricating coating comprises the following steps:
Step 1, adding oil-containing glass beads, a lubricating property imparting agent and a wetting dispersing agent into a lubricant binder, adding a diluting agent, mixing in a mechanical stirring mode, adding a defoaming agent after mixing, and standing to enable the oil-containing glass beads and the lubricating property imparting agent to be fully and uniformly dispersed to obtain a precursor fluid;
Step 2, spraying or brushing the precursor fluid obtained in the step 1 on the surface of a material to be lubricated, and curing the precursor fluid for 4-6 hours at 40-60 ℃ after the surface is dried to form a solid-liquid composite lubricating coating;
the oil-containing glass beads, the lubricating property imparting agent, the lubricant binder and the wetting dispersant are respectively 2-10 parts by weight, 5-10 parts by weight, 78-93 parts by weight and 0.2-2 parts by weight;
the average particle size of the oil-containing glass beads is 10-50 mu m, and the oil-containing glass beads are prepared by soaking base oil in hollow glass beads; the base oil is one or more of mineral oil, poly alpha olefin, ester oil and silicone oil;
the lubricating property imparting agent is one or more of polytetrafluoroethylene particles, molybdenum disulfide particles, polyimide particles and high molecular weight polyethylene particles.
2. Use of a solid-liquid composite lubricating coating according to claim 1, characterized in that: the lubricant binder is any one of elastic polyurethane, polyester resin, styrene-butadiene-styrene block copolymer and butyral resin.
3. Use of a solid-liquid composite lubricating coating according to claim 1, characterized in that: the dispersing agent is any one or more of titanate coupling agent, aluminate coupling agent, silane coupling agent and high-molecular carboxylic acid.
4. Use of a solid-liquid composite lubricating coating according to claim 1, characterized in that: the diluent is a surface paint diluent, and the ratio of the addition amount of the diluent to the total mass of the solid-liquid composite lubricating coating is 0.6-1.1:1.
5. Use of a solid-liquid composite lubricating coating according to claim 1, characterized in that: in the step 2, the surface of the material to be lubricated is coated after degreasing treatment, the thickness of the formed solid-liquid composite lubricating coating is 20-200 mu m, and the thickness of the coating is larger than the average particle size of the oil-containing glass beads.
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