CN101838576B - Dry film lubricant based on modified epoxy resin and preparation method thereof - Google Patents
Dry film lubricant based on modified epoxy resin and preparation method thereof Download PDFInfo
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- CN101838576B CN101838576B CN 200910096900 CN200910096900A CN101838576B CN 101838576 B CN101838576 B CN 101838576B CN 200910096900 CN200910096900 CN 200910096900 CN 200910096900 A CN200910096900 A CN 200910096900A CN 101838576 B CN101838576 B CN 101838576B
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Abstract
The invention discloses a dry film lubricant based on modified epoxy resin and characterized by comprising the following components: 100 to 120 parts of epoxy resin, 1 to 5 parts of inorganic nano-particles, 0.1 to 0.5 part of coupling agent, 20 to 60 parts of lubricant, 10 to 20 parts of anti-wear agent, 1 to 4 parts of dispersing agent, 10 to 30 parts of absolute alcohol and 0 to 20 parts of deionized water. The method for preparing the dry film lubricant comprises the following steps: firstly, carrying out surface modification on the inorganic nano-particles by the coupling agent; then, adding the modified inorganic nano-particles to the epoxy resin to obtain the modified water-based epoxy resin nano-emulsion; adding the dispersing agent to the mixture of the lubricant and the anti-wear agent drop by drop; then, adding the mixture to the modified water-based epoxy resin nano-emulsion, and evenly mixing; and further adding the deionized water to adjust the viscosity of coatings, thus obtaining the dry film lubricant based on the modified epoxy resin. The invention has the advantages of low emission of organic volatile substances, good frictional properties, strength, toughness, weather resistance, corrosion resistance and other overall properties and simple preparation process.
Description
Technical field
The present invention relates to water-borne coatings, specifically refer to a kind of dry film lubricant based on modified epoxy resin and preparation method thereof.
Background technology
Dry-film lubricant is one of main Types of solid lubricant, a kind of solid lubricant to be scattered in the organic or inorganic binder system, again with the coating process that is similar to paint on the friction means surface film forming to reduce a kind of novel lubricating technology of its friction and wear, especially organic binding dry film lubricant, adopt the macromolecule resin of types of binder to do carrier, one or more solid lubricants are adhered to the friction means surface, use simple, easy construction, can be at high low temperature, high loading, ultrahigh vacuum(HHV), effectively lubricated under the environment such as strong redox and severe radiation, be that present kind is maximum, a most widely used class dry-film lubricant.For example light lanzhou Chemicophysics Inst., Chinese Academy of Sciences has just developed tens kinds of organic binding dry film lubricants.But organic binding dry film lubricant mostly is solvent-borne type at present, and production and construction stage volatilize organic compound easily, and environment and the person are polluted and injure.Compare with solvent based coating, water-borne coatings organic volatile content is low, use safely, can wash by water.Based on the requirement of environmental protection, be badly in need of the friendly type aqueous lubricating of development environment dry film.
Resins, epoxy has in curing reaction that shrinking percentage is little, and the characteristics such as cured article cohesiveness, thermotolerance, resistance to acids and bases and mechanical property are good are larger kinds of application quantity in the thermosetting resin.At present commercialization of aqueous epoxy resins, the patent No. of the people such as the Li Tongsheng of Shanghai High Molecular Material Research and Dev Center application is the Chinese invention patent of ZL03116517.6 (notification number is CN1279151C), utilize commercial water-base epoxy, prepared a kind of aqueous epoxy adhering dried fim lubricant by adding the components such as solid lubricant, anti-wear agent, anti-sedimentation agent, rust-preventive agent, solidifying agent.But the water-base epoxy dry film exists weathering resistance, strengthens the toughness reinforcing problem that can not solve simultaneously at present.
Summary of the invention
Technical problem to be solved by this invention is the present situation for prior art, a kind of dry film lubricant based on modified epoxy resin is provided, it is by adding inorganic nano material in Resins, epoxy, rigidity, dimensional stability and the thermostability of inorganic materials are combined with the toughness of organic polymer, reach the weathering resistance of Effective Raise epoxy resin-base and strengthen toughness reinforcing purpose.
Another technical problem to be solved by this invention provides the preparation method of the good dry film lubricant based on modified epoxy resin of a kind of good weatherability and toughness and intensity.
The present invention solves the problems of the technologies described above the technical scheme that adopts: this dry film lubricant based on modified epoxy resin is characterized in that comprising following component: (following umber is parts by weight except specifying)
Resins, epoxy 100-120 part
Nano inoganic particle 1-5 part
Coupling agent 0.1-0.5 part
Lubricant 20-60 part
Anti-wear agent 10-20 part
Dispersion agent 1-4 part
Dehydrated alcohol 10-30 part
Deionized water 0-20 part
Wherein, nano inoganic particle can improve hardness, weathering resistance, thermostability and the erosion resistance of epoxy resin-base, thereby is conducive to improve the abrasion resistance properties of Resins, epoxy.Described nano inoganic particle is selected from silicon-dioxide, aluminium sesquioxide or titanium dioxide.
Coupling agent can be to the nano inoganic particle modifying surface, improves the binding ability of itself and organic filler.Described coupling agent is selected from γ-aminopropyl triethoxysilane or γ-methacryloxypropyl trimethoxy silane;
Aqueous dispersions of polytetrafluoroethylhaving, molybdenum disulfide powder or the powdered graphite of with lubricator being selected among the present invention, the three can use separately or arbitrary combination; Selecting preferably is the combination of two kinds of materials, for example adopts tetrafluoroethylene/molybdenumdisulphide or molybdenumdisulphide/graphite system; Best be chosen as the combination that described lubricant is aqueous dispersions of polytetrafluoroethylhaving and molybdenum disulfide powder, and both weight percents are 1-4: 1.
Anti-wear agent can improve the wear resistance of coating, is selected from a kind of in chromic oxide or the aluminum oxide, and preferably, powder size can be at 0.5-5 μ m.
In order to reduce the surface tension of coating, increase the moisture dispersibility of filler, need to add dispersion agent.Described dispersion agent is sodium laurylsulfonate or Sodium dodecylbenzene sulfonate.
Select dehydrated alcohol or water as the thinner of nano inoganic particle solvent and coating.
Preferably, described Resins, epoxy can be selected the single-component aqueous epoxy resin emulsion that is formed by E-06 or E-033 configuration.
The preparation method of above-mentioned dry film lubricant based on modified epoxy resin is characterized in that comprising the steps:
(1) coupling agent is carried out surface modification to nano inoganic particle, method is: the coupling agent of 0.1-0.5 part and the inorganic nano-particle of 1-5 part are joined in the dehydrated alcohol of 10-30 part, join in the Resins, epoxy of 100-120 part after magnetic agitation is even, obtain nanometer modified aqueous epoxy emulsion.
(2) in the mixture of the anti-wear agent of the lubricant of 20-60 part and 10-20 part, drip 1-4 part dispersion agent, then join in the above-mentioned nanometer modified aqueous epoxy emulsion, mix, add the viscosity of 0-20 part deionized water adjusting coating, obtain dry film lubricant based on modified epoxy resin.
In the aforesaid method, described nano inoganic particle can be selected from silicon-dioxide, aluminium sesquioxide or titanium dioxide; Described coupling agent can be selected from γ-aminopropyl triethoxysilane or γ-methacryloxypropyl trimethoxy silane; Described lubricant is optional from tetrafluoroethylene water dispersion, molybdenum disulfide powder or powdered graphite, and the three can use separately or arbitrary combination; Selecting preferably is the combination of two kinds of materials, for example adopts tetrafluoroethylene/molybdenumdisulphide or molybdenumdisulphide/graphite system; Best be chosen as the combination that described lubricant is aqueous dispersions of polytetrafluoroethylhaving and molybdenum disulfide powder, and both weight percents are 1-4: 1.A kind of in the optional autoxidation chromium of described anti-wear agent or the aluminum oxide, preferably, its powder size can be at 0.5-5 μ m; Described dispersion agent can be selected from sodium laurylsulfonate or Sodium dodecylbenzene sulfonate; Can select dehydrated alcohol or water as the thinner of nano inoganic particle solvent and coating.
Preferably, described Resins, epoxy can be selected the single-component aqueous epoxy resin emulsion that is formed by E-06 or E-033 configuration.
Compared with prior art, the invention has the advantages that: adopt inorganic nano-particle that aqueous epoxy resin emulsion is carried out nano modification and process, add afterwards prepared lubricated dry film of lubricant and anti-wear agent, the organic volatile quantity discharged is low, the good combination properties such as tribological property, intensity, toughness, weathering resistance, solidity to corrosion, the technique preparation is simple, can be widely used in the sliding friction parts such as food-processing machine, office machinery.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail, following each material umber is parts by weight except specifying.
Embodiment 1
With 2 parts of particle diameters after the Nano particles of silicon dioxide of 10-20nm drips 0.5 part of γ-aminopropyl triethoxysilane, add 20 parts of dehydrated alcohols, then be placed on the magnetic stirring apparatus stir 20 minutes with 800 rev/mins rotating speed after, join in 100 parts of E-06 aqueous epoxy resin emulsions magnetic agitation 30 minutes.Then add successively 30 parts of aqueous dispersions of polytetrafluoroethylhaving, 15 parts of molybdenum disulfide powders, 10 parts of granularities are the chromium oxide powder of 3 μ m, drip to adopt behind 2 parts of sodium laurylsulfonates to mix speed adjustable disperser and stir 30min with 1500 rev/mins rotating speed, obtain dry film lubricant based on modified epoxy resin.
Test the performance of above-mentioned dry film lubricant based on modified epoxy resin.The iron plate with sand papering in advance is immersed in the above-mentioned water-borne coatings, slowly vertically lifts out, leave standstill 5 minutes after, put into baking oven at 140 ℃ of lower 30min of curing, naturally cooling.Its fundamental property is as shown in table 1:
Table 1
Embodiment 2
With 3 parts of particle diameters after the titanium dioxide nano-particle of 10-20nm drips 0.4 part of γ-methacryloxypropyl trimethoxy silane, add 30 parts of dehydrated alcohols, then be placed on the magnetic stirring apparatus stir 20 minutes with 800 rev/mins rotating speed after, join in 100 parts of E-033 aqueous epoxy resin emulsions magnetic agitation 30 minutes.Then add successively 40 parts of polytetrafluoroethylene aqueous dispersions, 20 parts of powdered graphites, 10 parts of particle diameters are the alumina powder of 2 μ m, drip 1 part of Sodium dodecylbenzene sulfonate, add 10 parts deionized water and dilute rear employing mixing speed adjustable disperser and stir 30min with 1500 rev/mins rotating speed, obtain dry film lubricant based on modified epoxy resin.
Test the performance of above-mentioned dry film lubricant based on modified epoxy resin.The iron plate with sand papering in advance is immersed in the above-mentioned water-borne coatings, slowly vertically lifts out, leave standstill 5 minutes after, put into baking oven at 140 ℃ of lower 30min of curing, naturally cooling.Its fundamental property is as shown in table 2:
Table 2
Embodiment 3
With 5 parts of particle diameters after the aluminium sesquioxide nanoparticle of 20-30nm drips 0.2 part of γ-aminopropyl triethoxysilane, add 10 parts of dehydrated alcohols, then be placed on the magnetic stirring apparatus stir 20 minutes with 800 rev/mins rotating speed after, join in 100 parts of E-033 aqueous epoxy resin emulsions magnetic agitation 30 minutes.Then add successively 40 parts of molybdenum disulphide powders, 20 parts of Graphite Powder 99s, 15 parts of particle diameters are the chromium oxide powder of 5 μ m, 4 parts of sodium laurylsulfonates, then the deionized water that adds 20 parts dilutes, employing mixing speed adjustable disperser stirs 30min with 1500 rev/mins rotating speed, obtains dry film lubricant based on modified epoxy resin.
Test the performance of above-mentioned dry film lubricant based on modified epoxy resin.The iron plate with sand papering in advance is immersed in the above-mentioned water-borne coatings, slowly vertically lifts out, leave standstill 5 minutes after, put into baking oven at 140 ℃ of lower 30min of curing, naturally cooling.Its fundamental property is as shown in table 3:
Table 3
Claims (8)
1. dry film lubricant based on modified epoxy resin is characterized in that this dry film lubricant based on modified epoxy resin is comprised of the component of following parts by weight:
Wherein, described nano inoganic particle is selected from silicon-dioxide, aluminium sesquioxide or titanium dioxide; Described coupling agent is selected from γ-aminopropyl triethoxysilane or γ-methacryloxypropyl trimethoxy silane; Described lubricant is selected from least two kinds in aqueous dispersions of polytetrafluoroethylhaving, molybdenum disulfide powder and the powdered graphite; Described anti-wear agent is selected from chromic oxide or aluminum oxide; Described dispersion agent is sodium laurylsulfonate or Sodium dodecylbenzene sulfonate.
2. dry film lubricant based on modified epoxy resin according to claim 1 is characterized in that described Resins, epoxy is the single-component aqueous epoxy resin emulsion that E-06 or E-033 configuration form.
3. dry film lubricant based on modified epoxy resin according to claim 1 it is characterized in that described lubricant is the combination of aqueous dispersions of polytetrafluoroethylhaving and molybdenum disulfide powder, and both weight percents is 1-4: 1.
4. dry film lubricant based on modified epoxy resin according to claim 1, the granularity that it is characterized in that described anti-wear agent is 0.5-5 μ m.
5. the preparation method of a dry film lubricant based on modified epoxy resin is characterized in that comprising the steps:
(1) coupling agent is carried out surface modification to nano inoganic particle, method is: the coupling agent of 0.1-0.5 weight part and the inorganic nano-particle of 1-3 weight part are joined in the 10-30 weight part dehydrated alcohol, join in the Resins, epoxy of 100-120 weight part after magnetic agitation is even, obtain nanometer modified aqueous epoxy emulsion;
(2) in the mixture of the anti-wear agent of the lubricant of 20-60 weight part and 10-20 weight part, drip 1-2 weight part dispersion agent, then join in the above-mentioned nanometer modified aqueous epoxy emulsion, mix, add the viscosity of 0-20 parts by weight of deionized water adjusting coating, obtain dry film lubricant based on modified epoxy resin;
Wherein, described nano inoganic particle is selected from silicon-dioxide, aluminium sesquioxide or titanium dioxide; Described coupling agent is selected from γ-aminopropyl triethoxysilane or γ-methacryloxypropyl trimethoxy silane; Described lubricant is selected from least two kinds in aqueous dispersions of polytetrafluoroethylhaving, molybdenum disulfide powder and the powdered graphite; Described anti-wear agent is selected from chromic oxide or aluminum oxide; Described dispersion agent is sodium laurylsulfonate or Sodium dodecylbenzene sulfonate.
6. the preparation method of dry film lubricant based on modified epoxy resin according to claim 5 is characterized in that described Resins, epoxy is the single-component aqueous epoxy resin emulsion that E-06 or E-033 configuration form.
7. the preparation method of dry film lubricant based on modified epoxy resin according to claim 5 it is characterized in that described lubricant is the combination of aqueous dispersions of polytetrafluoroethylhaving and molybdenum disulfide powder, and both weight percents is 1-4: 1.
8. the preparation method of dry film lubricant based on modified epoxy resin according to claim 5, the granularity that it is characterized in that described anti-wear agent is 0.5-5 μ m.
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