CN110903715A - Protective coating for sealing element and preparation method thereof - Google Patents
Protective coating for sealing element and preparation method thereof Download PDFInfo
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- CN110903715A CN110903715A CN201911230158.7A CN201911230158A CN110903715A CN 110903715 A CN110903715 A CN 110903715A CN 201911230158 A CN201911230158 A CN 201911230158A CN 110903715 A CN110903715 A CN 110903715A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D127/00—Coating 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 a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating 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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating 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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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Abstract
The invention relates to the technical field of protective coatings, and aims to provide a protective coating for a sealing element, which has the technical scheme that: the paint comprises the following components in parts by weight: 100-120 parts of polytetrafluoroethylene, 40-70 parts of mixed solvent, 5-12 parts of silicon carbide, 15-30 parts of film forming agent, 0.5-5 parts of defoaming agent, 0.5-5 parts of flatting agent and 5-15 parts of soluble pigment; the preparation method of the protective coating for the sealing element comprises the following steps: s1, uniformly mixing dipropylene glycol and propylene glycol methyl ether in proportion at the temperature of 80-100 ℃, adding polytetrafluoroethylene, silicon carbide and soluble pigment, and uniformly mixing and stirring; and S2, adjusting the temperature to 105-110 ℃, then slowly adding the film forming agent, stirring uniformly, slowly adding the defoaming agent, stirring uniformly, finally slowly adding the leveling agent, stirring uniformly, and naturally cooling to obtain the coating. The protective coating disclosed by the invention has the advantages of strong adhesive force in combination with a sealing element, good protective properties such as corrosion resistance and wear resistance.
Description
Technical Field
The invention relates to the technical field of protective coatings, in particular to a protective coating for a sealing element and a preparation method thereof.
Background
The sealing member is a component or a material of the component which prevents leakage of fluid or solid particles from between adjacent joint surfaces and intrusion of foreign substances such as dust, moisture, etc. into the interior of the machine equipment. The sealing element is mainly made of rubber and plastic materials and mainly comprises the following components: nitrile rubber, ethylene propylene diene monomer, fluororubber, silicone rubber, fluorosilicone rubber, nylon, polyurethane, engineering plastics and the like, and the sealing element material generally has excellent heat resistance, cold resistance, weather resistance and aging resistance, so the sealing element material has a wide application range. However, the mechanical properties such as tensile strength and tear strength of some sealing materials are poor, and the oil resistance and solvent resistance are poor, and a protective coating is usually required to be coated on the surface of the sealing material to improve the oil resistance, wear resistance and friction resistance of the sealing material.
The application publication No. CN105237792A discloses a preparation method of a polytetrafluoroethylene super-hydrophobic coating, wherein a supercritical method is adopted, a polytetrafluoroethylene plate and a substrate are placed in a reaction kettle with a heating device, carbon dioxide or nitrogen is introduced into the kettle, the temperature is controlled to be 260-340 ℃, the pressure is controlled to be 20-60 Mpa, the introduced gas is in a supercritical state, the pressure is maintained for 12-20 h, then pressure relief cooling is carried out, the pressure relief time is 10-300 s, and the super-hydrophobic polytetrafluoroethylene plate and the super-hydrophobic substrate are obtained.
Although the preparation process is simple and easy to implement, no solvent is needed in the preparation process, and the consumption and pollution of water resources in the production process are reduced, the crystallinity of the molecular structure of the polytetrafluoroethylene is high, the melt viscosity is 1011Pa at 380 ℃, and the critical surface tension is 18.5 multiplied by 10-3N/m, so the polytetrafluoroethylene coating resin is not easy to be soaked by liquid, namely, the polytetrafluoroethylene coating resin has excellent non-stick property, so that the polytetrafluoroethylene coating resin has low adhesion with a sealing piece base material, is not easy to be compatible with other coating components, so that the polytetrafluoroethylene coating is easy to separate from the base material, and is limited on the base material with high temperature resistance of 400 ℃ due to high melt viscosity of the polytetrafluoroethylene, so that the application of the polytetrafluoroethylene coating resin is greatly limited. Therefore, there is a need to develop a fluorine-containing seal coating that has strong adhesion to substrates at lower temperatures.
SUMMARY OF THE PATENT FOR INVENTION
The first purpose of the invention is to provide a protective coating for a sealing element, which has the advantages of strong adhesion force combined with the sealing element and good protective properties of corrosion resistance, wear resistance and the like.
The technical purpose of the invention is realized by the following technical scheme:
a protective coating for a sealing element comprises the following components in parts by weight: 100-120 parts of polytetrafluoroethylene, 40-70 parts of mixed solvent, 5-12 parts of silicon carbide, 15-30 parts of film forming agent, 0.5-5 parts of Foamaster III defoaming agent, 0.5-5 parts of leveling agent of leveling 620 and 5-15 parts of soluble pigment.
By adopting the technical scheme, the polytetrafluoroethylene is a high molecular compound formed by polymerizing tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-adhesiveness, electrical insulation property and ageing resistance; the mixed solvent can disperse the polytetrafluoroethylene to form a dispersion system; the silicon carbide has the advantages of good chemical property stability, high heat conductivity coefficient, small thermal expansion coefficient and good wear resistance, can improve the wear resistance and sealing stability of the coating, can conduct and dissipate heat of a sealing part in time due to good heat conductivity of the silicon carbide, and reduces the temperature of the sealing part and the sealing part, thereby improving the service life and the sealing effect of the sealing part; the film forming agent can promote the plastic flow and elastic deformation of the high molecular compound, improve the coalescence performance and contribute to improving the film forming coverage and the adhesion effect of coating.
Wherein the foamasterIII defoamer is purchased from basf corporation, and the leveling agent 620 is purchased from Gaoko corporation, Han.
Further, the average particle size of the polytetrafluoroethylene particles is 100-500 nm, and the polytetrafluoroethylene comprises 100-200 nm particles, 200-300 nm particles and 300-500 nm particles in a mass ratio of 1:1.5: 2.
By adopting the technical scheme, the blending system with different particle size ranges can be formed by blending the polytetrafluoroethylene particles with different particle size gradient ranges, the coating shielding effect and the coating compactness of the coating are improved, and the uniform stability of the polytetrafluoroethylene in the coating system is improved due to the particle size gradient difference formed by blending the polytetrafluoroethylene particles with different particle size ranges.
Further, the mixed solvent comprises dipropylene glycol and propylene glycol methyl ether in a mass ratio of 1:1.
By adopting the technical scheme, the dipropylene glycol and the propylene glycol methyl ether are good organic solvents, and the uniformity of dispersion and blending of the components can be further improved by mixing the dipropylene glycol and the propylene glycol methyl ether, so that the coating construction of the coating is facilitated.
Further, the silicon carbide is green silicon carbide micro powder, and the particle size of the green silicon carbide micro powder is 0.5-3 mu m.
By adopting the technical scheme, the green silicon carbide has better self-sharpening property and higher wear resistance, and is beneficial to improving the wear resistance of the coating.
Further, the film forming agent comprises an acrylic resin film forming agent, a polyurethane resin film forming agent and an acrylic resin polyurethane copolymer resin film forming agent in a mass ratio of 1:1: 1.5.
By adopting the technical scheme, the acrylic resin film forming agent is a polymer formed by multi-copolymerization of vinyl derivatives (acrylic ester, acrylonitrile, acrylamide and the like) based on acrylic acid, has good film forming property, strong adhesive force, good film flexibility, larger ductility, high light transmittance, light resistance and aging resistance, but has the defects that the elasticity is reduced and the hardness is increased along with the increase of the temperature so as to influence the protective property of a coating; the film layer formed by the polyurethane film forming agent has excellent mechanical property, strong shielding and blocking performance and good high temperature resistance, and can play a synergistic effect by being mixed and compounded with the acrylic resin film forming agent so as to improve the protection effect of the coating; the acrylic resin and polyurethane copolymer resin film-forming agent has the advantages of both an acrylic resin film-forming agent and a polyurethane resin film-forming agent, and can improve the mixing stability of the multi-component film-forming agent.
Further, the soluble pigment is any one of cobalt oxide, chromium oxide, carbon black, titanium dioxide, mica powder, aluminum powder, mica iron oxide and glass flakes.
By adopting the technical scheme, the soluble pigment can enable the coating to have the color which is obviously different from that of the sealing element, when the sealing element is used for a long time, the protective coating on the surface of the sealing element is worn or cracked, the surface of the sealing element can be exposed, and under the obvious color difference, the abnormity of the protective coating can be conveniently found in time and the repair can be carried out in time.
The second purpose of the invention is to provide a preparation method of the protective coating for the sealing element, which has the advantages of high preparation efficiency and good protection of the prepared coating.
The second purpose of the patent of the invention is realized by the following technical scheme:
a preparation method of a protective coating for a sealing element comprises the following preparation steps:
s1, uniformly mixing dipropylene glycol and propylene glycol methyl ether in proportion at the temperature of 80-100 ℃, adding polytetrafluoroethylene, silicon carbide and soluble pigment, and uniformly mixing and stirring;
and S2, adjusting the temperature to 105-110 ℃, then slowly adding the film forming agent, stirring uniformly, slowly adding the Foamaster III defoaming agent, stirring uniformly, finally slowly adding the leveling agent Levelling620, stirring uniformly, and naturally cooling to obtain the coating.
By adopting the technical scheme, the dipropylene glycol and the propylene glycol methyl ether are uniformly mixed in advance according to the proportion, and then the polytetrafluoroethylene, the silicon carbide and the soluble pigment are added for mixing and stirring uniformly, so that the pre-dispersion effect of the polytetrafluoroethylene, the silicon carbide and the pigment is improved, and the mixing uniformity of all components of the coating is improved; after the temperature is increased, the film forming agent, the defoaming agent and the flatting agent are added, so that the generation of foams during the mixing of the components can be reduced, the fluidity of the components during the mixing is improved, and the uniformity of the mixed coating is further ensured.
Further, in the step S1, polytetrafluoroethylene, silicon carbide, and a soluble pigment are mixed and stirred by an ultrasonic stirrer.
By adopting the technical scheme, the ultrasonic wave can increase the motion frequency of each component particle with different particle sizes in the solvent, improve the motion intensity of each component ion and further contribute to improving the mutual mixing of each component particle.
Further, before the film forming agent is added in the step S2, ultrasonic stirring is stopped, mechanical stirring is adopted, and the stirring speed is 800-1200 rpm.
Through adopting above-mentioned technical scheme, close the ultrasonic wave before adding the film-forming agent and adopt the mode of mechanical stirring to stir, mainly reduce stirring strength, reduce the intensity of film-forming agent dispersion mixing in-process to reduce the production of foam, help improving the mixing homogeneity of film-forming agent, and help improving the film forming ability when coating later stage is coated.
In conclusion, the invention has the following beneficial effects:
1. according to the invention, the polytetrafluoroethylene particles with excellent corrosion resistance and ageing resistance are adopted to prepare the protective coating of the sealing element, and the polytetrafluoroethylene particles with different particle size ranges are blended, so that the dispersion uniformity of the polytetrafluoroethylene is effectively improved, and the effects of improving the shielding property and the protection uniformity of the protective coating of the sealing element are achieved;
2. according to the invention, the silicon carbide is added, so that the heat conductivity of the silicon carbide is good, the heat of the sealing part can be conducted and dissipated in time, and the temperature of the sealing part and the sealing part is reduced, so that the service life and the sealing effect of the sealing part are improved;
3. according to the invention, the three film forming agents, namely the acrylic resin film forming agent, the polyurethane resin film forming agent and the acrylic resin polyurethane copolymer resin film forming agent are compounded, so that the film forming property of the protective coating is improved, and the effects of improving the coating uniformity and the protection durability of the coating are further achieved.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
Example 1: a protective coating for a sealing element comprises the following components in parts by weight: 100 parts of polytetrafluoroethylene, 40 parts of mixed solvent, 5 parts of silicon carbide, 15 parts of film forming agent, 0.5 part of Foamaster III defoaming agent, 0.5 part of leveling agent of leveling 620 and 5 parts of soluble pigment; wherein the average particle size of the polytetrafluoroethylene particles is 100-500 nm, and the polytetrafluoroethylene comprises 100-200 nm particles, 200-300 nm particles and 300-500 nm particles in a mass ratio of 1:1.5: 2; the mixed solvent comprises dipropylene glycol and propylene glycol methyl ether in a mass ratio of 1: 1; the silicon carbide is green silicon carbide micro powder, and the particle size of the green silicon carbide micro powder is 0.5-3 mu m; the film forming agent comprises an acrylic resin film forming agent, a polyurethane resin film forming agent and an acrylic resin polyurethane copolymer resin film forming agent in a mass ratio of 1:1: 1.5; the soluble pigment is any one of cobalt oxide, chromium oxide, carbon black, titanium dioxide, mica powder, aluminum powder, mica iron oxide and glass flakes;
the preparation method of the protective coating for the sealing element comprises the following preparation steps:
s1, uniformly mixing dipropylene glycol and propylene glycol methyl ether in proportion at the temperature of 80 ℃, adding polytetrafluoroethylene, silicon carbide and soluble pigment, and uniformly mixing and stirring by using an ultrasonic stirrer;
and S2, turning off the ultrasonic waves, adjusting the temperature to 105 ℃, then slowly adding the film forming agent, uniformly stirring, slowly adding the Foamaster III defoaming agent, mechanically stirring to be uniform at the stirring speed of 800rpm, finally slowly adding the leveller 620, stirring to be uniform, and naturally cooling to obtain the coating.
Example 2: a protective coating for a sealing element comprises the following components in parts by weight: 105 parts of polytetrafluoroethylene, 48 parts of mixed solvent, 7 parts of silicon carbide, 19 parts of film forming agent, 1.6 parts of Foamaster III defoaming agent, 1.6 parts of leveling agent of leveling 620 and 7.5 parts of soluble pigment; wherein the average particle size of the polytetrafluoroethylene particles is 100-500 nm, and the polytetrafluoroethylene comprises 100-200 nm particles, 200-300 nm particles and 300-500 nm particles in a mass ratio of 1:1.5: 2; the mixed solvent comprises dipropylene glycol and propylene glycol methyl ether in a mass ratio of 1: 1; the silicon carbide is green silicon carbide micro powder, and the particle size of the green silicon carbide micro powder is 0.5-3 mu m; the film forming agent comprises an acrylic resin film forming agent, a polyurethane resin film forming agent and an acrylic resin polyurethane copolymer resin film forming agent in a mass ratio of 1:1: 1.5; the soluble pigment is any one of cobalt oxide, chromium oxide, carbon black, titanium dioxide, mica powder, aluminum powder, mica iron oxide and glass flakes;
the preparation method of the protective coating for the sealing element comprises the following preparation steps:
s1, uniformly mixing dipropylene glycol and propylene glycol methyl ether in proportion at the temperature of 85 ℃, adding polytetrafluoroethylene, silicon carbide and soluble pigment, and uniformly mixing and stirring by using an ultrasonic stirrer;
and S2, turning off the ultrasonic waves, adjusting the temperature to 106 ℃, then slowly adding the film forming agent, uniformly stirring, slowly adding the Foamaster III defoaming agent, mechanically stirring to be uniform at the stirring speed of 900rpm, finally slowly adding the Levelling agent Levelling620, stirring to be uniform, and naturally cooling to obtain the coating.
Example 3: a protective coating for a sealing element comprises the following components in parts by weight: 110 parts of polytetrafluoroethylene, 56 parts of mixed solvent, 9 parts of silicon carbide, 23 parts of film forming agent, 2.7 parts of Foamaster III defoaming agent, 2.7 parts of leveling agent and 10 parts of soluble pigment; wherein the average particle size of the polytetrafluoroethylene particles is 100-500 nm, and the polytetrafluoroethylene comprises 100-200 nm particles, 200-300 nm particles and 300-500 nm particles in a mass ratio of 1:1.5: 2; the mixed solvent comprises dipropylene glycol and propylene glycol methyl ether in a mass ratio of 1: 1; the silicon carbide is green silicon carbide micro powder, and the particle size of the green silicon carbide micro powder is 0.5-3 mu m; the film forming agent comprises an acrylic resin film forming agent, a polyurethane resin film forming agent and an acrylic resin polyurethane copolymer resin film forming agent in a mass ratio of 1:1: 1.5; the soluble pigment is any one of cobalt oxide, chromium oxide, carbon black, titanium dioxide, mica powder, aluminum powder, mica iron oxide and glass flakes;
the preparation method of the protective coating for the sealing element comprises the following preparation steps:
s1, uniformly mixing dipropylene glycol and propylene glycol methyl ether in proportion at the temperature of 90 ℃, adding polytetrafluoroethylene, silicon carbide and soluble pigment, and uniformly mixing and stirring by using an ultrasonic stirrer;
and S2, turning off the ultrasonic waves, adjusting the temperature to 107 ℃, then slowly adding the film forming agent, uniformly stirring, slowly adding the Foamaster III defoaming agent, mechanically stirring to be uniform at the stirring speed of 1000rpm, finally slowly adding the leveller 620, stirring to be uniform, and naturally cooling to obtain the coating.
Example 4: a protective coating for a sealing element comprises the following components in parts by weight: 115 parts of polytetrafluoroethylene, 64 parts of mixed solvent, 11 parts of silicon carbide, 27 parts of film forming agent, 3.8 parts of Foamaster III defoaming agent, 3.8 parts of leveling agent of leveling 620 and 12.5 parts of soluble pigment; wherein the average particle size of the polytetrafluoroethylene particles is 100-500 nm, and the polytetrafluoroethylene comprises 100-200 nm particles, 200-300 nm particles and 300-500 nm particles in a mass ratio of 1:1.5: 2; the mixed solvent comprises dipropylene glycol and propylene glycol methyl ether in a mass ratio of 1: 1; the silicon carbide is green silicon carbide micro powder, and the particle size of the green silicon carbide micro powder is 0.5-3 mu m; the film forming agent comprises an acrylic resin film forming agent, a polyurethane resin film forming agent and an acrylic resin polyurethane copolymer resin film forming agent in a mass ratio of 1:1: 1.5; the soluble pigment is any one of cobalt oxide, chromium oxide, carbon black, titanium dioxide, mica powder, aluminum powder, mica iron oxide and glass flakes;
the preparation method of the protective coating for the sealing element comprises the following preparation steps:
s1, uniformly mixing dipropylene glycol and propylene glycol methyl ether in proportion at the temperature of 95 ℃, adding polytetrafluoroethylene, silicon carbide and soluble pigment, and uniformly mixing and stirring by using an ultrasonic stirrer;
and S2, turning off the ultrasonic waves, adjusting the temperature to 109 ℃, then slowly adding the film forming agent, uniformly stirring, slowly adding the Foamaster III defoaming agent, mechanically stirring to be uniform at the stirring speed of 1100rpm, finally slowly adding the leveller 620, stirring to be uniform, and naturally cooling to obtain the coating.
Example 5: a protective coating for a sealing element comprises the following components in parts by weight: 120 parts of polytetrafluoroethylene, 70 parts of mixed solvent, 12 parts of silicon carbide, 30 parts of film forming agent, 5 parts of Foamaster III defoaming agent, 5 parts of Levelling620 leveling agent and 15 parts of soluble pigment; wherein the average particle size of the polytetrafluoroethylene particles is 100-500 nm, and the polytetrafluoroethylene comprises 100-200 nm particles, 200-300 nm particles and 300-500 nm particles in a mass ratio of 1:1.5: 2; the mixed solvent comprises dipropylene glycol and propylene glycol methyl ether in a mass ratio of 1: 1; the silicon carbide is green silicon carbide micro powder, and the particle size of the green silicon carbide micro powder is 0.5-3 mu m; the film forming agent comprises an acrylic resin film forming agent, a polyurethane resin film forming agent and an acrylic resin polyurethane copolymer resin film forming agent in a mass ratio of 1:1: 1.5; the soluble pigment is any one of cobalt oxide, chromium oxide, carbon black, titanium dioxide, mica powder, aluminum powder, mica iron oxide and glass flakes;
the preparation method of the protective coating for the sealing element comprises the following preparation steps:
s1, uniformly mixing dipropylene glycol and propylene glycol methyl ether in proportion at the temperature of 100 ℃, adding polytetrafluoroethylene, silicon carbide and soluble pigment, and uniformly mixing and stirring by using an ultrasonic stirrer;
and S2, turning off the ultrasonic waves, adjusting the temperature to 110 ℃, then slowly adding the film forming agent, uniformly stirring, slowly adding the Foamaster III defoaming agent, mechanically stirring to be uniform at the stirring speed of 1200rpm, finally slowly adding the leveller 620, stirring to be uniform, and naturally cooling to obtain the coating.
Comparative example 1: a protective coating for a sealing element is different from the protective coating in embodiment 1 in that only 100-200 nm particles are selected as polytetrafluoroethylene particles.
Comparative example 2: a protective coating for a sealing element is different from the protective coating in embodiment 1 in that only 200-300 nm particles are selected as polytetrafluoroethylene particles.
Comparative example 3: a protective coating for a sealing element is different from the protective coating in embodiment 1 in that only 300-500 nm particles are selected as polytetrafluoroethylene particles.
Comparative example 4: a protective coating for a sealer, which is different from example 1 in that the mixed solvent is dipropylene glycol.
Comparative example 5: a protective coating for a sealer, which is different from example 1 in that the mixed solvent is propylene glycol methyl ether.
Comparative example 6: a protective coating for a seal, differing from example 1 in that no silicon carbide was added.
Comparative example 7: a protective coating for a sealer, which is different from example 1 in that ultrasonic agitation is not used in the step of preparing the protective coating S1.
And (3) corrosion resistance testing: selecting sealing elements made of rubber materials and having the same specification, respectively selecting the sealing elements of examples 1-5 and the coatings prepared in comparative examples 1-7, coating the surfaces of the sealing elements to form protective coatings, keeping the coating mode and the coating thickness of the protective coatings consistent, after the coatings are cured, respectively putting test samples coated with the protective coatings, comparison samples and sealing element samples not coated with the coatings into 35 ℃ sodium hydroxide (50%), nitric acid (70%) and hydrofluoric acid for soaking test for 7 days, and taking out the test samples after the test is finished to record the change conditions of the samples. The test results are shown in table 1.
TABLE 1 Corrosion resistance test results for examples 1-5, comparative examples 1-7, and uncoated seals
And (3) testing results: the test results in the table 1 show that no obvious abnormality is found in any of the examples 1 to 5 in three corrosion environments, which indicates that the protective coating of the sealing element has strong acid-base corrosion resistance; comparative examples 4 and 5 have no obvious abnormality in three corrosion environments, which shows that the use of dipropylene glycol or propylene glycol methyl ether alone as a solvent has no obvious influence on the corrosion resistance of the coating; the comparative examples 1 to 3 show slight swelling in three corrosive environments, which indicates that the corrosion resistance of the coating is negatively affected by the single use of polytetrafluoroethylene with a single particle size range, and the uniformity of the mixing and dispersion of the polytetrafluoroethylene with a single particle size range when the polytetrafluoroethylene is mixed with a solvent and other components is relatively poor, so that the uniformity of the components of the coating is limited, and the corrosion resistance of the coating is affected; slight swelling also occurs in comparative example 6 and comparative example 7, which shows that the addition of silicon carbide helps to improve the corrosion resistance of the coating, and the ultrasonic stirring has certain benefits for pre-dispersion mixing of polytetrafluoroethylene and a solvent; the uncoated sealing element has obvious swelling in three corrosive environments, which shows that the protective coating formed by the coating has obvious corrosion prevention effect on the sealing element.
And (3) testing the adhesive force:
1. the coatings of examples 1 to 5 and comparative examples 1 to 7 were tested for adhesion rating according to the method specified in GB/T9286-1998 test for marking out paint and varnish films. Wherein, the 0 level: the cut edge was completely smooth, no one lattice fell, level 1: there was little coating peeling at the intersection of the cuts, but the cross cut area was not affected significantly more than 5%.
2. After the samples 1 to 5 and the comparative samples 1 to 7 were elongated by 150%, the surface coating was observed under a microscope to see whether the coating had cracks or peeling points.
TABLE 2 adhesion test results for examples 1-5 and comparative examples 1-7
| Grade of adhesion | Coating appearance after stretching | |
| Example 1 | 0 | No crack and peeling broken point |
| Example 2 | 0 | No crack and peeling broken point |
| Example 3 | 0 | No crack and peeling broken point |
| Example 4 | 0 | No crack and peeling broken point |
| Example 5 | 0 | No crack and peeling broken point |
| Comparative example 1 | 1 | No crack and peeling broken point |
| Comparative example 2 | 1 | Crack and spalling point |
| Comparative example 3 | 1 | Crack and spalling point |
| Comparative example 4 | 1 | No crack and peeling broken point |
| Comparative example 5 | 1 | No crack and peeling broken point |
| Comparative example 6 | 1 | Crack and spalling point |
| Comparative example 7 | 1 | Crack and spalling point |
And (3) testing results: the test results in table 2 show that the adhesive force of the coating in examples 1 to 5 reaches the 0 grade, and the coating on the surface of the stretched sealing element has no cracks or peeling broken points, which indicates that the coating formed by the coating has strong bonding force with the sealing element, namely the coating has good adhesive force; the adhesion grades of the comparative examples 1, 4 and 5 are all 1 grade, but the coatings on the surfaces of the stretched sealing elements have no cracks or peeling broken points, which shows that the use of the polytetrafluoroethylene particles with a single particle size range and a single solvent has influence on the mixing and dispersing uniformity of all components of the coating, thereby influencing the mutual dispersion synergistic effect among all the components and limiting the uniformity and stability of the adhesion of the coatings; the adhesion grades of the comparative examples 2, 3, 6 and 7 are all 1 grade, and the coatings on the surfaces of the stretched sealing elements have cracks and peeling broken points, which shows that the dispersion uniformity of the polytetrafluoroethylene particles in a single particle size range in the coating is poor, and the dispersion uniformity is relatively poor when the particle size range is larger, so that the adhesion between the coating and the surfaces of the sealing elements is influenced; from the test results, it can be known that the addition of silicon carbide is also beneficial to improving the adhesion of the coating, and when the polytetrafluoroethylene particles and the solvent are mixed in advance, the addition of ultrasonic agitation can improve the dispersion uniformity of the components, particularly polytetrafluoroethylene, in the mixed system, thereby being beneficial to improving the adhesion of the coating.
The present embodiment is only for explaining the patent of the present invention, and it is not limited to the patent of the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as required after reading the present specification, but all are protected by the patent law within the scope of the claims of the present patent.
Claims (9)
1. The protective coating for the sealing element is characterized by comprising the following components in parts by weight: 100-120 parts of polytetrafluoroethylene, 40-70 parts of mixed solvent, 5-12 parts of silicon carbide, 15-30 parts of film forming agent, 0.5-5 parts of Foamaster III defoaming agent, 0.5-5 parts of leveling agent of leveling 620 and 5-15 parts of soluble pigment.
2. The protective coating for seals of claim 1, wherein: the average particle size of the polytetrafluoroethylene particles is 100-500 nm, and the polytetrafluoroethylene comprises 100-200 nm particles, 200-300 nm particles and 300-500 nm particles in a mass ratio of 1:1.5: 2.
3. The protective coating for seals of claim 1, wherein: the mixed solvent comprises dipropylene glycol and propylene glycol methyl ether in a mass ratio of 1:1.
4. The protective coating for seals of claim 1,
the silicon carbide is green silicon carbide micro powder, and the particle size of the green silicon carbide micro powder is 0.5-3 mu m.
5. The protective coating for the sealing element according to claim 1, wherein the film forming agent comprises an acrylic resin film forming agent, a polyurethane resin film forming agent and an acrylic resin polyurethane copolymer resin film forming agent in a mass ratio of 1:1: 1.5.
6. The protective coating for seals of claim 1, wherein: the soluble pigment is any one of cobalt oxide, chromium oxide, carbon black, titanium dioxide, mica powder, aluminum powder, mica iron oxide and glass flakes.
7. The method for preparing the protective coating for the sealing member according to any one of claims 1 to 7, comprising the steps of:
s1, uniformly mixing dipropylene glycol and propylene glycol methyl ether in proportion at the temperature of 80-100 ℃, adding polytetrafluoroethylene, silicon carbide and soluble pigment, and uniformly mixing and stirring;
and S2, adjusting the temperature to 105-110 ℃, then slowly adding the film forming agent, stirring uniformly, slowly adding the Foamaster III defoaming agent, stirring uniformly, finally slowly adding the leveling agent Levelling620, stirring uniformly, and naturally cooling to obtain the coating.
8. The method of claim 7, wherein the step of S1 comprises stirring the polytetrafluoroethylene, silicon carbide, and soluble pigment with an ultrasonic stirrer.
9. The method for preparing the protective coating for the sealing element according to claim 7, wherein ultrasonic stirring is stopped before the film forming agent is added in the step S2, and mechanical stirring is adopted, wherein the stirring speed is 800-1200 rpm.
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