CN115181469B - Protective coating for rubber oil seal and preparation method thereof - Google Patents
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- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention discloses a protective coating for a rubber oil seal and a preparation method thereof, which relate to the technical field of coatings, and comprise, by weight, 15-40 parts of polyurea modified acrylic resin emulsion, 10-30 parts of aliphatic polyester polyol and mesoporous nano SiO 2 4-8 parts of microspheres, 1-3 parts of dispersing agent, 0.1-0.5 part of flatting agent, 0.1-0.5 part of defoaming agent and 5-10 parts of auxiliary agent. According to the invention, the acrylic resin is subjected to polyurea modification, the intermolecular force is enhanced, and a compact wear-resistant protective layer is formed on the surface of the rubber oil seal, so that the technical effect of prolonging the service life of the rubber oil seal is realized.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a protective coating for a rubber oil seal and a preparation method thereof.
Background
The rubber is a high-elasticity polymer material with reversible deformation, is rich in elasticity at room temperature, can generate large deformation under the action of small external force, and can recover the original shape after the external force is removed. The development of chemical industry has promoted the maturity of synthetic Rubber technology, and various synthetic Rubber types having excellent properties have gradually appeared, such as Styrene Butadiene Rubber (SBR), butyl Rubber (IIR), isoprene Rubber (PR), and the like.
Due to the good performance of the rubber product in the aspects of elasticity and restorability, the rubber product is commonly used in various sealing products, such as rubber oil seals, O-shaped rings, sealing rubber strips and the like. The rubber oil seal is a mechanical element in a transmission system, and separates a part needing lubrication in a transmission part from an output part, so that the lubricating oil is prevented from leaking. The oil seal is made of Nitrile Rubber (NBR), fluororubber, silicon Rubber and the like, and although the Rubber material has certain wear resistance and heat resistance, the Rubber material is affected by various environmental factors in the use process and is still easy to age and corrode.
Disclosure of Invention
The invention mainly aims to provide a protective coating for a nitrile rubber product and a preparation method thereof, and aims to protect the surface of the nitrile rubber product through the protective coating so as to delay a corrosion process and prolong the service life of the nitrile rubber product.
In order to achieve the purpose, the invention provides a protective coating of a rubber oil seal, which comprises, by weight, 15-40 parts of polyurea modified acrylic resin emulsion, 10-30 parts of aliphatic polyester polyol and mesoporous nano SiO 2 4-8 parts of microspheres, 1-3 parts of dispersing agent, 0.1-0.5 part of flatting agent, 0.1-0.5 part of defoaming agent and 5-10 parts of auxiliary agent.
Optionally, the polyurea modified acrylic resin emulsion is prepared by semi-continuous seed emulsion polymerization of a methacrylic acid monomer and an n-butyl acrylate monomer, and the preparation process comprises the following steps:
adding a methacrylic acid monomer and an n-butyl acrylate monomer into the end-acrylate-based polyurea oligomer at one time, and uniformly stirring to form a mixed solution A;
sequentially adding distilled water and an emulsifier into a preparation container, uniformly stirring, adding the solution A, continuously stirring, standing for 5-10min, adding acrylamide, and emulsifying to form a monomer pre-emulsion B;
sequentially adding distilled water, an emulsifier, sodium bicarbonate and sodium polymethacrylate into a reaction container, stirring, putting into an oil bath at 35-45 ℃, and emulsifying for 30-40min to form a bottoming emulsion C;
quickly dropping part of the monomer pre-emulsion B into the priming emulsion C, heating to 80 ℃ after dropping, quickly dropping part of potassium persulfate solution, and simultaneously dropping the rest of the monomer pre-emulsion B and the potassium persulfate solution when the color of the reaction solution is changed for 2.5-3 hours;
and continuously dropwise adding the mixed solution A and a potassium persulfate solution into the solution obtained in the previous step for 2.5-3h, carrying out heat preservation reaction for 2-3h after the dropwise adding is finished, cooling and filtering to obtain the polyurea modified acrylic resin emulsion.
Optionally, the terminal acrylate-based polyurea oligomer is prepared by polymerizing a terminal amino polyether and isophorone diisocyanate, and the end-capping agent is hydroxyethyl acrylate.
Optionally, the mass percentage of the terminal acrylate-based polyurea oligomer to the total amount of all monomers is 6-12%.
Alternatively, the ratio of n-butyl acrylate monomer to methacrylic acid monomer is 0.95 to 1.02.
Optionally, the emulsifier comprises octylphenol polyoxyethylene ether and sodium dodecyl sulfate, and the proportion of the octylphenol polyoxyethylene ether to the sodium dodecyl sulfate is 2:1-3:1.
Optionally, the aliphatic polyester polyol is a polycarbonate polyol or an adipic acid polyester polyol.
Optionally, the mesoporous nano SiO 2 The particle size of the microsphere is 80-100nm.
Optionally, the adjuvant is a dodecyl alcohol ester or hexylene glycol butyl ether acetate.
Further, in order to achieve the above object, the present invention also provides a method for preparing a protective coating material for a rubber oil seal, for preparing the protective coating material for a rubber oil seal as described above, comprising the steps of:
slowly adding 1-3 parts of dispersing agent, 0.1-0.5 part of flatting agent and 0.1-0.5 part of defoaming agent into a reactor filled with distilled water in sequence, stirring, and adding the mesoporous nano SiO in the stirring process 2 4-8 parts of microspheres to form slurry I;
adding 10-30 parts of aliphatic polyester polyol and 5-10 parts of auxiliary agent into 15-40 parts of polyurea modified acrylic resin emulsion, and uniformly mixing to form slurry II;
and mixing the slurry I and the slurry II, adjusting the pH value to 7-8, and filtering to obtain the protective coating of the rubber oil seal.
The protective coating for the rubber oil seal provided by the invention is characterized in that the acrylic resin is subjected to polyurea modification, high-density hydrogen bonds are formed in the coating through urea bonds in a polyurea system, the urea bonds interact with each other to generate hydrogen bonds, the intermolecular force is enhanced, and the coating shows that the coating is more pure than pure coatingThe acrylic ester has stronger heat resistance, solvent resistance and wear resistance, and mesoporous SiO is added 2 The microspheres are used as the filler in the coating to enhance the heat-insulating property, the aliphatic polyester polyol and the polyurea modified acrylic resin generate a synergistic effect, the adhesive force of the coating to the rubber oil seal after coating is enhanced, and the performances are integrated, so that the service performance of the rubber oil seal is improved, and the service life of the rubber oil seal is prolonged.
Drawings
FIG. 1 is a schematic view of a preparation process of a polyurea modified acrylic resin emulsion involved in a protective coating of a rubber oil seal in an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The water-based paint is a paint using water as a solvent or a dispersion medium, and compared with a solvent-based paint, the water-based paint has lower VOC (Volatile Organic Compounds) content and low toxicity, and is gradually called a more popular environment-friendly chemical product. Polyacrylate (PA) is a water-based coating which is widely used, but pure acrylate emulsion has the defects of low-temperature brittleness, high-temperature viscosity and strength loss, easy re-adhesion and the like, and the modification of the acrylate emulsion becomes an effective means for improving various properties of the acrylate emulsion.
The embodiment of the invention provides a protective coating for a rubber oil seal, which comprises, by weight, 15-40 parts of polyurea modified acrylic resin emulsion, 10-30 parts of aliphatic polyester polyol and mesoporous nano SiO 2 4-8 parts of microspheres, 1-3 parts of dispersing agent, 0.1-1 part of wetting agent, 0.1-0.5 part of flatting agent, 0.1-0.5 part of defoaming agent and 5-10 parts of auxiliary agent.
As shown in FIG. 1, the preparation process of the polyurea modified acrylic resin emulsion may include the following steps:
step S10, adding a methacrylic acid monomer and an n-butyl acrylate monomer into the end-acrylate-based polyurea oligomer at one time, and uniformly stirring to form a mixed solution A;
this example uses the polymerization of amine terminated polyether (D-2000) and isophorone diisocyanate (IPDI) to prepare an acrylate terminated polyurea oligomer with hydroxyethyl acrylate (HEA) as the end-capping agent. During the synthesis reaction of polyurea, hydrogen transfer occurs between functional groups to initiate addition polymerization reaction, the molecular chain of the polymer gradually grows along with the extension of reaction time, and the polymerization degree is increased.
The isocyanate substance is easy to react with water to generate carbon dioxide, before the isocyanate is used for reaction, the raw materials of the amino-terminated polyether and the hydroxyethyl acrylate can be dehydrated, and the treatment operation can be drying for 6 hours in a vacuum drying oven at 120 ℃.
When the terminal acrylate-based polyurea oligomer is prepared, acetone subjected to dehydration treatment is used as a solvent, weighed D-2000, IPDI and HEA are dissolved, IPDI acetone solution is added under stirring, then D-2000 acetone solution is slowly dripped into the IPDI acetone solution, the temperature is raised to 70-80 ℃ after reaction for 1-2h to obtain polyurea prepolymer, HEA acetone solution is dripped into the polyurea prepolymer, the temperature is kept for reaction for 2-3h, and the terminal acrylate-based polyurea oligomer is obtained after acetone is removed. The end acrylate-based polyurea oligomer contains carbon-carbon double bonds, can be used as an external cross-linking agent to be copolymerized with an acrylate monomer, introduces polyurea macromolecules into acrylate polymer emulsion, and promotes a cross-linking process by adding the hydrogen bond action of urea bonds to form a network structure.
The monomers used, methacrylic acid (MMA) and n-Butyl Acrylate (BA), may be purified first, the polymerization inhibitor being removed by distillation under reduced pressure. Adding MMA and BA into the terminal acrylate-based polyurea oligomer at one time to fully dissolve the terminal acrylate-based polyurea oligomer to form a monomer mixed solution A.
The ratio of n-butyl acrylate monomer to methacrylic acid monomer is 0.95 to 1.02. The mass percentage of the terminal acrylate-based polyurea oligomer in the total amount of all monomers is 6-12%.
Step S20, sequentially adding distilled water and an emulsifier into a preparation container, uniformly stirring, adding the solution A, continuously stirring, standing for 5-10min, adding acrylamide, and emulsifying to form a monomer pre-emulsion B;
after the monomer mixed solution A is prepared, emulsion polymerization is carried out by using a monomer pre-emulsification semi-continuous seed emulsion polymerization process. Firstly, preparing monomer pre-emulsion B, adding distilled water and emulsifier in several times, firstly adding a small amount of the above-mentioned materials, uniformly stirring them and adding all the above-mentioned materials. And standing for a period of time after continuously stirring, adding hydrophilic monomer acrylamide, continuously stirring and emulsifying to obtain a monomer pre-emulsion B when the emulsion system is stable.
The emulsifier used can be a composite emulsifier, which comprises octyl phenol polyoxyethylene ether (OP-10) and Sodium Dodecyl Sulfate (SDS), wherein the proportion of the octyl phenol polyoxyethylene ether and the sodium dodecyl sulfate is 2:1-3:1.
Step S30, sequentially adding distilled water, an emulsifier, sodium bicarbonate and sodium polymethacrylate into a reaction container, stirring, putting into an oil bath at 35-45 ℃, and emulsifying for 30-40min to form a bottoming emulsion C;
sodium bicarbonate was used as buffer and prime emulsion C was used as base for the subsequent emulsification process.
Step S40, quickly dropping part of the monomer pre-emulsion B into the priming emulsion C, heating to 80 ℃ after dropping, quickly dropping part of potassium persulfate solution, and simultaneously dropping the rest of the monomer pre-emulsion B and the potassium persulfate solution when the color of the reaction solution is changed for 2.5-3 hours;
and adding the monomer pre-emulsion B and potassium persulfate into the priming emulsion C step by step, quickly dropwise adding a small part of the monomer pre-emulsion B, quickly dropwise adding a part of potassium persulfate after the dropwise adding is finished and the temperature is raised to 80 ℃, slightly turning blue the color of the emulsion, simultaneously dropwise adding the rest of the monomer pre-emulsion B and the rest of the potassium persulfate aqueous solution when the color change is observed, wherein the dropwise adding time is 2.5-3h, and the dropwise adding process is carried out in batches.
And S50, continuously dropwise adding the mixed solution A and the potassium persulfate solution into the solution obtained in the previous step for 2.5-3h, carrying out heat preservation reaction for 2-3h after dropwise adding, cooling and filtering to obtain the polyurea modified acrylic resin emulsion.
And continuously and simultaneously dripping the mixed solution A and the potassium persulfate solution for 2.5-3h, carrying out the dripping process in batches, carrying out heat preservation reaction for 2-3h after finishing the dripping, cooling to about 40 ℃, and filtering while the solution is hot to obtain the polyurea modified acrylic resin emulsion.
The dispersant may facilitate the dispersion of the filler in the coating system. The dispersant used in this example may be PEG-400.
The flatting agent can eliminate the defects on the surface of a coating film, reduce the interfacial tension between the coating and a substrate, improve the fluidity of the coating and improve the flatness of the coating film. The leveling agent used in this embodiment may be 1,2-propanediol.
The water-based paint is often required to solve the production and construction problems caused by the generation of foam, and the presence of the foam can obstruct the dispersion of fillers in the paint, so that the surface of a coating film is defective, and the weather resistance is reduced. The defoaming agent can reduce the influence of foam. The defoamer used in this example may be tributyl phosphate.
The polymer in the water paint is formed into film by means of deformation and fusion after water in dispersing medium is volatilized. The auxiliary agent can improve the plastic flow and the elastic flow of the particles and improve the coalescence performance among the particles. The auxiliary agent used in this embodiment may be dodecyl alcohol ester or hexanediol butyl ether acetate.
The step of preparing the protective coating material for a rubber oil seal may include:
step a, slowly adding 1-3 parts of dispersing agent, 0.1-0.5 part of flatting agent and 0.1-0.5 part of defoaming agent into a reactor filled with distilled water in sequence, stirring, and adding the mesoporous nano SiO in the stirring process 2 4-8 parts of microspheres to form slurry I;
b, adding 10-30 parts of aliphatic polyester polyol and 5-10 parts of auxiliary agent into 15-40 parts of polyurea modified acrylic resin emulsion, and uniformly mixing to form slurry II;
and c, mixing the slurry I and the slurry II, adjusting the pH value to 7-8, and filtering to obtain the protective coating of the rubber oil seal.
Mesoporous nano SiO 2 The microspheres are used as filler in the coating, have the particle size of 80-100nm and can enhance the heat insulation of the coatingThe performance reduces the erosion of the rubber oil seal by high temperature in the using process. The silicon material has low self heat conductivity coefficient and mesoporous nano SiO 2 The interior of the hollow shell is provided with a plurality of channels, so that the air flow in the hollow shell can be blocked, and the mesoporous nano SiO can be further reduced 2 The heat conductivity coefficient of the material prevents heat transfer between the coating film and the rubber oil seal, and the heat insulation effect is achieved.
The used aliphatic polyester polyol can be polycarbonate polyol or adipic acid polyester polyol, and the aliphatic polyester polyol and the polyurea modified acrylic resin cooperate to improve the adhesive force to the rubber substrate and simultaneously improve the oxidation resistance and the wear resistance after film forming.
Example 1
Adding a methacrylic acid monomer and an n-butyl acrylate monomer into the end-acrylate-based polyurea oligomer in one step, and uniformly stirring to form a mixed solution A, wherein the ratio of the n-butyl acrylate monomer to the methacrylic acid monomer is 0.95;
sequentially adding distilled water and an emulsifier into a preparation container, uniformly stirring, adding the solution A, continuously stirring, standing for 5-10min, adding acrylamide, and emulsifying to form a monomer pre-emulsion B;
adding distilled water, an emulsifier, sodium bicarbonate and sodium polymethacrylate into a reaction container in sequence, stirring, putting into an oil bath at 35-45 ℃, and emulsifying for 30-40min to form a bottoming emulsion C, wherein the proportion of the octylphenol polyoxyethylene ether and the sodium dodecyl sulfate in the emulsifier is 2:1;
quickly dropping part of the monomer pre-emulsion B into the priming emulsion C, heating to 80 ℃ after dropping, quickly dropping part of potassium persulfate solution, and simultaneously dropping the rest of the monomer pre-emulsion B and the potassium persulfate solution when the color of the reaction solution is changed for 2.5-3 hours;
and continuously dropwise adding the mixed solution A and a potassium persulfate solution into the solution obtained in the previous step for 2.5-3h, carrying out heat preservation reaction for 2-3h after the dropwise adding is finished, cooling and filtering to obtain the polyurea modified acrylic resin emulsion.
Steaming to the potSequentially and slowly adding 1 part of dispersing agent, 0.1 part of flatting agent and 0.1 part of defoaming agent into a reactor for distilling water, stirring, and adding the mesoporous nano SiO in the stirring process 2 4 parts of microspheres to form slurry I;
adding 10 parts of aliphatic polyester polyol and 5 parts of auxiliary agent into 15 parts of polyurea modified acrylic resin emulsion, and uniformly mixing to form slurry II;
and mixing the slurry I and the slurry II, adjusting the pH value to 7-8, and filtering to obtain the protective coating of the rubber oil seal.
Example 2
Adding a methacrylic acid monomer and an n-butyl acrylate monomer into the end-acrylate-based polyurea oligomer at one time, and uniformly stirring to form a mixed solution A, wherein the ratio of the n-butyl acrylate monomer to the methacrylic acid monomer is 0.98;
sequentially adding distilled water and an emulsifier into a preparation container, uniformly stirring, adding the solution A, continuously stirring, standing for 5-10min, adding acrylamide, and emulsifying to form a monomer pre-emulsion B;
adding distilled water, an emulsifier, sodium bicarbonate and sodium polymethacrylate into a reaction container in sequence, stirring, putting into an oil bath at 35-45 ℃, and emulsifying for 30-40min to form a bottoming emulsion C, wherein the proportion of the octylphenol polyoxyethylene ether to the sodium dodecyl sulfate in the emulsifier is 2.5;
quickly dropping part of the monomer pre-emulsion B into the priming emulsion C, heating to 80 ℃ after dropping, quickly dropping part of potassium persulfate solution, and simultaneously dropping the rest of the monomer pre-emulsion B and the potassium persulfate solution when the color of the reaction solution is changed for 2.5-3 hours;
and continuously dropwise adding the mixed solution A and a potassium persulfate solution into the solution obtained in the previous step for 2.5-3h, carrying out heat preservation reaction for 2-3h after the dropwise adding is finished, cooling and filtering to obtain the polyurea modified acrylic resin emulsion.
2 parts of dispersant, 0.1-0.3 part of flatting agent and 0.3 part of defoaming agent are slowly added into a reactor filled with distilled water in turnStirring, adding the mesoporous nano SiO in the stirring process 2 6 parts of microspheres to form slurry I;
adding 20 parts of aliphatic polyester polyol and 8 parts of auxiliary agent into 30 parts of polyurea modified acrylic resin emulsion, and uniformly mixing to form slurry II;
and mixing the slurry I and the slurry II, adjusting the pH value to 7-8, and filtering to obtain the protective coating of the rubber oil seal.
Example 3
Adding a methacrylic acid monomer and an n-butyl acrylate monomer into the end-acrylate-based polyurea oligomer at one time, and uniformly stirring to form a mixed solution A, wherein the ratio of the n-butyl acrylate monomer to the methacrylic acid monomer is 1.02;
sequentially adding distilled water and an emulsifier into a preparation container, uniformly stirring, adding the solution A, continuously stirring, standing for 5-10min, adding acrylamide, and emulsifying to form a monomer pre-emulsion B;
adding distilled water, an emulsifier, sodium bicarbonate and sodium polymethacrylate into a reaction container in sequence, stirring, putting into an oil bath at 35-45 ℃, and emulsifying for 30-40min to form a bottoming emulsion C, wherein the proportion of the octylphenol polyoxyethylene ether and the sodium dodecyl sulfate in the emulsifier is 3:1;
quickly dropping part of the monomer pre-emulsion B into the priming emulsion C, heating to 80 ℃ after dropping, quickly dropping part of potassium persulfate solution, and simultaneously dropping the rest of the monomer pre-emulsion B and the potassium persulfate solution when the color of the reaction solution is changed for 2.5-3 hours;
and continuously dropwise adding the mixed solution A and a potassium persulfate solution into the solution obtained in the previous step for 2.5-3h, carrying out heat preservation reaction for 2-3h after the dropwise adding is finished, cooling and filtering to obtain the polyurea modified acrylic resin emulsion.
Slowly adding 3 parts of dispersing agent, 0.5 part of flatting agent and 0.5 part of defoaming agent into a reactor filled with distilled water in sequence, stirring, and adding the mesoporous nano SiO in the stirring process 2 8 parts of microspheres to form slurryMaterial I;
adding 30 parts of aliphatic polyester polyol and 10 parts of auxiliary agent into 40 parts of polyurea modified acrylic resin emulsion, and uniformly mixing to form slurry II;
and mixing the slurry I and the slurry II, adjusting the pH value to 7-8, and filtering to obtain the protective coating of the rubber oil seal.
Comparative example 1
The difference from the embodiment 1 is that: the polyurea modified acrylate emulsion is changed into pure polyacrylate emulsion.
After the coating prepared in the above example was coated on the surface of a rubber oil seal, a solvent resistance test, an abrasion resistance test, a tensile strength test and a heat insulation test were performed, and the test results are shown in table 1 below. The results in table 1 show that the polyurea modified acrylate emulsion has better organic solvent resistance, smaller abrasion loss and tensile strength, and the existence of hydrogen bonds improves the wear resistance, the flexibility and the heat insulation performance. The content of the acrylate-terminated polyurea oligomers in the coating has an influence on the mechanical properties, in relation to their hydrogen bonding structure.
Table 1:
the above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The protective coating for the rubber oil seal is characterized by comprising, by weight, 15-40 parts of polyurea modified acrylic resin emulsion, 10-30 parts of aliphatic polyester polyol and mesoporous nano SiO 2 4-8 parts of microspheres and 1-plus dispersant3 parts of flatting agent, 0.1-0.5 part of defoaming agent, 0.1-0.5 part of antifoaming agent and 5-10 parts of auxiliary agent, wherein the dispersing agent is PEG-400;
the polyurea modified acrylic resin emulsion is prepared by polymerizing a methacrylic acid monomer and an n-butyl acrylate monomer through a semi-continuous seed emulsion, and the preparation process comprises the following steps:
adding a methacrylic acid monomer and an n-butyl acrylate monomer into the end-acrylate-based polyurea oligomer at one time, and uniformly stirring to form a mixed solution A;
sequentially adding distilled water and an emulsifier into a preparation container, uniformly stirring, adding the solution A, continuously stirring, standing for 5-10min, adding acrylamide, and emulsifying to form a monomer pre-emulsion B;
sequentially adding distilled water, an emulsifier, sodium bicarbonate and sodium polymethacrylate into a reaction container, stirring, putting into an oil bath at 35-45 ℃, and emulsifying for 30-40min to form a bottoming emulsion C;
quickly dropwise adding part of the monomer pre-emulsion B into the priming emulsion C, heating to 80 ℃ after dropwise adding is finished, quickly dropwise adding part of potassium persulfate solution, and dropwise adding the rest of the monomer pre-emulsion B and the rest of the potassium persulfate solution simultaneously when the color of the reaction solution is changed for 2.5-3 hours;
and continuously dropwise adding the mixed solution A and a potassium persulfate solution into the solution obtained in the previous step for 2.5-3h, carrying out heat preservation reaction for 2-3h after the dropwise adding is finished, cooling and filtering to obtain the polyurea modified acrylic resin emulsion.
2. A protective coating for a rubber oil seal according to claim 1, wherein said terminal acrylate-based polyurea oligomer is obtained by polymerization of an amine-terminated polyether and isophorone diisocyanate, and the end-capping agent is hydroxyethyl acrylate.
3. A protective coating for a rubber oil seal as defined in claim 2, wherein said terminal acrylate-based polyurea oligomer is present in an amount of 6 to 12% by mass based on the total amount of all monomers.
4. A protective coating for a rubber oil seal as defined in claim 3, wherein said n-butyl acrylate monomer and methacrylic acid monomer are in a ratio of 0.95 to 1.02.
5. A protective coating for a rubber oil seal as defined in claim 4, wherein said emulsifier comprises octylphenol polyoxyethylene ether and sodium lauryl sulfate, and the ratio of octylphenol polyoxyethylene ether to sodium lauryl sulfate is 2:1-3:1.
6. A protective coating for a rubber oil seal as defined in claim 5, wherein said aliphatic polyester polyol is a polycarbonate polyol or an adipic acid polyester polyol.
7. The protective coating for a rubber oil seal according to claim 6, wherein said mesoporous nano SiO is 2 The particle size of the microsphere is 80-100nm.
8. A protective coating for a rubber oil seal as defined in claim 7, wherein said auxiliary is a dodecyl alcohol ester or butyl cellosolve acetate.
9. A method for preparing a protective coating for a rubber oil seal, which is used for preparing the protective coating for a rubber oil seal according to any one of claims 1 to 8, comprising the steps of:
slowly adding 1-3 parts of dispersing agent, 0.1-0.5 part of flatting agent and 0.1-0.5 part of defoaming agent into a reactor filled with distilled water in sequence, stirring, and adding the mesoporous nano SiO in the stirring process 2 4-8 parts of microspheres to form slurry I;
adding 10-30 parts of aliphatic polyester polyol and 5-10 parts of auxiliary agent into 15-40 parts of polyurea modified acrylic resin emulsion, and uniformly mixing to form slurry II;
and mixing the slurry I and the slurry II, adjusting the pH value to 7-8, and filtering to obtain the protective coating of the rubber oil seal.
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