Protective layer for installation-free magnetic lamp on oil field site

Abstract

The invention discloses a protective layer for an installation-free magnetic lamp on an oil field site and a preparation method of the protective layer, and belongs to the technical field of coatings, the protective layer is attached to a magnetic suction plate surface of the installation-free magnetic lamp, a plurality of magnets which are evenly distributed are installed on the magnetic suction plate surface of the installation-free magnetic lamp, and the magnets are neodymium iron boron magnets. The static attraction force of a single magnet is larger than 20 kg, and the protective layer comprises a bottom layer and a stripping layer. The bottom layer is prepared from isocyanate group modified fluorocarbon resin, an NHS (N-Hydroxysuccinimide) activated ester modified mica flake modified nano magnetic powder compound, an ethylene-vinyl alcohol copolymer, n-butyl acetate, dibutyl phthalate, a polycarboxylate dispersing agent and 3-isocyanate group propyl trimethoxy silane; the stripping layer is prepared from isocyanate group modified fluorocarbon resin, acrylate polyol, poly (N-isopropylacrylamide) modified pressure-sensitive viscous microspheres and a silane coupling agent. The problems of oil stain and corrosion are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coating, and relates to a protective layer for an installation-free magnetic lamp in an oil field site. BACKGROUND

[0002] The installation-free magnetic lamp can be quickly and conveniently adsorbed on the surface of an iron-based device to be fixed by using the strong magnetic attraction performance of a neodymium iron boron magnet, and can be quickly disassembled, and can be applied to night work scenes such as oil field drilling, well repairing and inspection. However, the working environment in the oil field site is poor, and there are a large amount of oil stains, debris, dust and humid water vapor, etc. The magnetic attraction plate surface (neodymium iron boron magnet) of the magnetic lamp is exposed to the complex environment for a long time, and the magnetic attraction plate surface is easy to adhere to impurities such as debris and oil stains, which is difficult to clean, and long-term accumulation can reduce the magnetic attraction firmness, and the magnetic lamp is easy to fall off during use. In addition, oil stains and water vapor can penetrate into the magnet, which can easily cause the magnet to rust and shorten the service life of the magnetic lamp. SUMMARY

[0003] The present application aims to provide a protective layer for an installation-free magnetic lamp in an oil field site, which solves the problem that the magnetic attraction plate surface of the installation-free magnetic lamp accumulates pollutants such as oil stains and debris during long-term use in the oil field site, and reduces the magnetic attraction firmness.

[0004] The technical scheme adopted by the present application is as follows: A protective layer for an installation-free magnetic lamp in an oil field site, the protective layer is attached to the magnetic attraction plate surface of the installation-free magnetic lamp, a plurality of uniformly distributed magnets are installed on the magnetic attraction plate surface of the installation-free magnetic lamp, the magnets are neodymium iron boron magnets, the static attraction of a single magnet is greater than 20 kg, the protective layer comprises a bottom layer and a release layer, the bottom layer is fully coated on the magnetic attraction plate surface of the installation-free magnetic lamp, and the release layer covers the bottom layer and the area of the release layer is greater than the area of the magnetic attraction plate surface. The bottom layer comprises the following components in parts by weight: 48-55 parts of isocyanate group modified fluorocarbon resin, 22-28 parts of NHS activated ester modified mica flake modified nano magnetic powder compound, 10-12 parts of ethylene-vinyl alcohol copolymer, 15-18 parts of n-butyl acetate, 3-5 parts of dibutyl phthalate, 2-3 parts of polycarboxylate dispersant, and 4-5 parts of 3-isocyanate group propyl trimethoxysilane. The release layer comprises the following components in parts by weight: 42-48 parts of isocyanate group modified fluorocarbon resin, 34-36 parts of acrylate polyol, 10-12 parts of poly N-isopropyl acrylamide modified pressure sensitive adhesive microspheres, and 2-3 parts of silane coupling agent.

[0005] Further, the nano-magnetic powder is composed of nano-carbonyl iron powder and nano-magnetite magnetic powder, and the mass ratio of the nano-carbonyl iron powder to the nano-magnetite magnetic powder is 3: (2-2.5); the particle size of the nano-carbonyl iron powder is 60-80 nm, and the particle size of the nano-magnetite magnetic powder is 50-70 nm.

[0006] Further, the NHS-activated ester modified mica flake modified nano-magnetic powder compound is prepared by the following preparation method: S1.1, uniformly mix nano-carbonyl iron powder and nano-magnetite magnetic powder to obtain nano-magnetic powder, add the nano-magnetic powder into an ethanol aqueous solution with a volume ratio of 3:1, ultrasonically disperse to obtain a nano-magnetic powder suspension, add 3-aminopropyl triethoxysilane with a mass of 5% of the nano-magnetic powder into the nano-magnetic powder suspension, heat to 60℃, and react for 2-2.5 hours under stirring, filter and dry to obtain pretreated nano-magnetic powder; S1.2, add mica flake into dichloromethane with a solid-liquid ratio of 1:10 g / ml, uniformly stir, add succinic anhydride with a mass of 9% of the mica flake, heat to 70℃, and react for 3 hours under constant temperature stirring, then filter to obtain modified mica flake; uniformly disperse the modified mica flake into MES buffer solution with a pH of 6, then add EDC and NHS with a molar ratio of 1: (1.3-1.5), react for 3 hours at room temperature, filter and dry the precipitate to obtain NHS-activated ester modified mica flake; S1.3, mix the pretreated nano-magnetic powder and the NHS-activated ester modified mica flake according to a mass ratio of (2.7-2.9):1 to obtain a mixture, disperse the mixture into phosphate buffer solution with a pH of 7.3-7.5, react for 2-3 hours at room temperature, then filter and dry the precipitate to obtain an NHS-activated ester modified mica flake modified nano-magnetic powder compound.

[0007] Further, the same isocyanate group modified fluorocarbon resin is used for the bottom layer and the release layer; the isocyanate group modified fluorocarbon resin is prepared by using diisocyanate, fluorocarbon resin and modified acrylic monomer as raw materials with a molar ratio of 2:1:1; wherein the modified acrylic monomer is obtained by mixing mercaptan, acrylic monomer and photoinitiator under inert gas protection, and then performing mercapto-vinyl click reaction at room temperature.

[0008] Further, the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres are prepared by the following method: deionized water is taken, and sodium dodecyl sulfate is added in an amount of 0.3% of the mass of the deionized water; after stirring and dissolving, butyl acrylate, methyl methacrylate and N-isopropyl acrylamide are added and stirred uniformly, and ultrasonic dispersion is performed for 10 min to form a uniform emulsion system; nitrogen is introduced into the emulsion system to remove oxygen in the system, then ammonium persulfate is added in an amount of 0.5% of the total mass of butyl acrylate, methyl methacrylate and N-isopropyl acrylamide, and the temperature is raised to 70°C; after constant temperature stirring and reaction for 16-18 h, filtration, washing and drying are performed to obtain the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres.

[0009] Further, the ethylene-vinyl alcohol copolymer is obtained by copolymerization of ethylene and vinyl alcohol at a mass ratio of 2.8: (7-7.3).

[0010] Further, the bottom layer is prepared by the following method: ethylene-vinyl alcohol copolymer is dissolved in an organic solvent to obtain an ethylene-vinyl alcohol copolymer solution; isocyanate group modified fluorocarbon resin and n-butyl acetate are uniformly mixed, then the ethylene-vinyl alcohol copolymer solution is added under stirring, and after uniform mixing, dibutyl phthalate, polycarboxylate dispersant, 3-isocyanate propyl trimethoxysilane, NHS activated ester modified mica flake modified nano magnetic powder compound are sequentially added under stirring, and high-speed dispersion is performed after uniform stirring to obtain a bottom layer slurry; the slurry is uniformly coated on the surface of a clean and dry magnetic plate, and solidification is performed to obtain the bottom layer.

[0011] Further, the release layer is prepared by the following method: isocyanate group modified fluorocarbon resin and acrylate polyol are mixed in a dry container, uniform mixing is performed, then silane coupling agent is added and uniform stirring is continued, then poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres are slowly added under stirring at a speed of 200-300 r / min, and the mixed glue liquid is obtained after the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres are completely added and uniformly dispersed; the mixed glue liquid is vacuum degassed and uniformly coated on a release film, complete solidification is performed at 45-55°C, and the release layer is obtained after cooling to 20°C; in use, the release layer is pressed and attached on the bottom layer to attach the release layer and the surface of the magnetic plate.

[0012] Further, the thickness of the bottom layer is 0.03-0.05 mm.

[0013] Further, the thickness of the release layer is 0.45-0.55 mm.

[0014] In summary, due to the adoption of the above technical solutions, the application has the following beneficial effects: The protective layer for the installation-free magnetic lamp in the oil field comprises a bottom layer and a stripping layer, the bottom layer is directly coated on the magnetic adsorption panel surface of the installation-free magnetic lamp to form a waterproof and oil stain resistant protective effect, reduce the adhesion amount of oil stain pollutants on the magnetic adsorption panel surface, and solve the problems of oil stain and rust; however, the bottom layer produces a physical blocking effect between the magnetic adsorption panel and the iron-based support, which reduces the magnetic adsorption firmness, therefore, in order to compensate for this defect, the application adds the NHS activated ester modified mica flake modified nanometer magnetic powder compound in the bottom layer, which is uniformly dispersed in the bottom layer, has the magnetic adsorption function, plays a magnetic adsorption compensation role, and reduces the degree of reduction of the magnetic adsorption firmness. In the application, the NHS activated ester modified mica flake modified nanometer magnetic powder plays a magnetic adsorption compensation role in the bottom layer, and the bottom layer also has the magnetic adsorption function; in the unused state (idle or storage or moving state), iron debris in the environment is easily adhered to the magnetic adsorption panel surface, a large amount of debris adhered to the magnetic adsorption panel surface not only causes surface wear, but also reduces the magnetic adsorption firmness; therefore, the stripping layer is introduced into the protective layer of the application, the stripping layer does not have magnetism, and is mainly modified with isocyanate-based fluorocarbon resin, the surface is not easy to adhere to pollutants, and the stripping layer plays a role of oil stain resistance, water resistance and debris resistance. The poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres in the stripping layer are the main pressure-sensitive adhesive components, the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres have temperature sensitivity after modification, the adhesion strength between the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres and the bottom layer is reduced after heating to a temperature exceeding the critical phase transition temperature, and the stripping layer can be directly and completely torn off; after the stripping layer is placed in the air and the temperature is below the critical temperature, the adhesion of the surface of the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres is relatively enhanced, and the stripping layer can be repeatedly used. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the application, and should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings, wherein: Figure 1 is a structure diagram of the magnetic lamp applied in the application; Figure 2 is a structure diagram of the magnetic adsorption panel surface; Figure 3 is a preparation process of the NHS activated ester modified mica flake modified nanometer magnetic powder compound.

[0016] Markings in the figure: 1, adsorption upper plate, 2, mounting plate, 3, magnet sleeve, 4, magnet. DETAILED DESCRIPTION

[0017] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application, that is, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0018] Therefore, the detailed description of the embodiments of the present application provided below in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor are within the scope of protection of the present application.

[0019] It should be noted that the relational terms such as "first" and "second" and the like are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0020] The features and performances of the present application will be further described in detail below with reference to the embodiments.

[0021] The embodiment of the present application provides a protective layer for an installation-free magnetic light in an oil field site, the protective layer is attached to a magnetic attraction plate surface of the installation-free magnetic light, a plurality of uniformly distributed magnets are installed on the magnetic attraction plate surface of the installation-free magnetic light, the magnets are neodymium-iron-boron magnets, the static attraction of a single magnet is greater than 20 kg, the protective layer comprises a bottom layer and a release layer, the bottom layer is fully coated on the magnetic attraction plate surface of the installation-free magnetic light, and the release layer covers the bottom layer and the area of the release layer is greater than the area of the magnetic attraction plate surface. The bottom layer comprises the following components in parts by weight: 48-55 parts isocyanate-modified fluorocarbon resin, 22-28 parts NHS activated ester modified mica flake modified nano-magnetic powder composite, 10-12 parts ethylene-vinyl alcohol copolymer, 15-18 parts n-butyl acetate, 3-5 parts dibutyl phthalate, 2-3 parts polycarboxylate dispersant, and 4-5 parts 3-isocyanate-propyltrimethoxysilane; the polycarboxylate dispersant actually adopts DS8637 comb-structured polycarboxylate nano-dispersant. The release layer comprises the following components in parts by weight: 42-48 parts isocyanate-modified fluorocarbon resin, 34-36 parts acrylate polyol, 10-12 parts poly(N-isopropylacrylamide) modified pressure-sensitive adhesive microspheres, and 2-3 parts silane coupling agent (KH550 silane coupling agent is used).

[0022] In the following embodiments, the nano-magnetic powder is composed of nano-carbonyl iron powder and nano-ferric oxide magnetic powder, with a mass ratio of nano-carbonyl iron powder to nano-ferric oxide magnetic powder of 3:2.2; the particle size of nano-carbonyl iron powder is 60-80 nm, and the particle size of nano-ferric oxide magnetic powder is 50-70 nm.

[0023] like Figure 3 As shown, in the following embodiments, the NHS-activated ester-modified mica flake-modified nano-magnetic powder composite was prepared by the following method: S1.1. Nano carbonyl iron powder and nano iron oxide magnetic powder are mixed evenly to obtain nano magnetic powder. The nano magnetic powder is added to an ethanol aqueous solution with a volume ratio of 3:1 and ultrasonically dispersed to obtain a nano magnetic powder suspension. 5% (by weight of nano magnetic powder) of 3-aminopropyltriethoxysilane is added to the nano magnetic powder suspension, the temperature is raised to 60℃, and the reaction is carried out for 2.5 hours under stirring. The mixture is then filtered and dried to obtain pretreated nano magnetic powder. S1.2. Mica flakes were added to dichloromethane at a solid-liquid ratio of 1:10 g / ml. After stirring evenly, succinic anhydride at 9% of the mica flake mass was added. The mixture was heated to 70℃ and stirred at a constant temperature for 3 hours. The mixture was then filtered to obtain modified mica flakes. The modified mica flakes were then dispersed evenly in MES buffer solution at pH 6. EDC and NHS at a molar ratio of 1:1.4 were then added. The mixture was reacted at room temperature for 3 hours, filtered, and the precipitate was dried to obtain NHS-activated ester-modified mica flakes. The total amount of EDC and NHS added was 35% of the mica flake mass. S1.3. The pretreated nano-magnetic powder and NHS-activated ester-modified mica flakes were mixed at a mass ratio of 2.8:1 to obtain a mixture. The mixture was placed in a phosphate buffer solution with a pH of 7.4 and dispersed evenly. After reacting at room temperature for 3 hours, the mixture was filtered, dried, and the precipitate was obtained to obtain the NHS-activated ester-modified mica flake-modified nano-magnetic powder composite.

[0024] In the following examples, the bottom layer, the release layer adopts the same isocyanate group modified fluorocarbon resin; the isocyanate group modified fluorocarbon resin is prepared with diisocyanate (isophorone diisocyanate), fluorocarbon resin (FEVE type fluorocarbon resin) and modified acrylic monomer as raw materials in a molar ratio of 2:1:1; wherein the modified acrylic monomer is prepared by mixing mercaptan (β-mercaptoethanol) with acrylic monomer (isobornyl acrylate) and photoinitiator (2,2-dimethoxy-2-phenylphenylacetophenone) under inert gas protection, and then carrying out mercapto-vinyl click reaction at room temperature to obtain a modified acrylic monomer with a hydroxyl end; wherein the molar ratio of β-mercaptoethanol to isobornyl acrylate is 1:1, and the content of the photoinitiator is 1.5% of the total mass of isobornyl acrylate.

[0025] In the following examples, the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres are prepared by the following method: 100 mL of deionized water is taken, and sodium dodecyl sulfate is added (the amount is 0.3% of the mass of deionized water), stirred and dissolved, then 15 mL of butyl acrylate, 5 mL of methyl methacrylate and 8 g of N-isopropyl acrylamide are added, stirred uniformly, ultrasonically dispersed for 10 min (ultrasonic power 200 W) to form a uniform emulsion system; nitrogen is introduced into the emulsion system to remove oxygen in the system, then ammonium persulfate is added, the amount of ammonium persulfate is 0.5% of the mass sum of butyl acrylate, methyl methacrylate and N-isopropyl acrylamide, the temperature is raised to 70°C, and after constant temperature stirring reaction for 18 h, filtration, washing and drying are carried out to obtain poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres.

[0026] In the following examples, the ethylene-vinyl alcohol copolymer is obtained by copolymerization of ethylene and vinyl alcohol in a mass ratio of 2.8:7.2.

[0027] In the following examples, the bottom layer is prepared by the following method: ethylene-vinyl alcohol copolymer is dissolved in an organic solvent (dimethyl sulfoxide) to obtain an ethylene-vinyl alcohol copolymer solution; the isocyanate group modified fluorocarbon resin is uniformly mixed with n-butyl acetate, then the ethylene-vinyl alcohol copolymer solution is added under stirring, and then dibutyl phthalate, polycarboxylate dispersant, 3-isocyanate propyl trimethoxysilane and NHS activated ester modified mica flake modified nano magnetic powder compound are sequentially added under stirring, and then high-speed dispersion (1200-1500 r / min) is carried out to obtain a bottom layer slurry; the slurry is uniformly coated on the surface of a clean and dry magnetic plate, and then solidified (completely solidified at 60-70°C) to obtain the bottom layer.

[0028] In the following embodiments, the release layer is prepared by the following method: isocyanate-modified fluorocarbon resin and acrylate polyol are mixed in a dry container, and after uniform mixing, a silane coupling agent is added and the mixture is stirred until uniform. Then, poly(N-isopropylacrylamide) modified pressure-sensitive adhesive microspheres are slowly added at a stirring speed of 200-300 r / min. After the poly(N-isopropylacrylamide) modified pressure-sensitive adhesive microspheres are added and uniformly dispersed, a mixed adhesive solution is obtained. The mixed adhesive solution is vacuum degassed and then uniformly coated onto a release film. It is then completely cured at 50°C and cooled to 20°C to obtain the release layer. In use, the side of the release layer that is different from the release film is pressed and adhered to the bottom layer to bond the release layer to the magnetic plate surface. When it is necessary to peel off the release layer, the release layer is heated to about 40°C to reduce the adhesion strength between the release layer and the magnetic plate surface. After peeling off, it has relatively strong adhesion again at a low temperature (20°C) and can be reused.

[0029] In the following embodiments, the thickness of the bottom layer is 0.03-0.05 mm.

[0030] In the following embodiments, the thickness of the release layer is 0.45-0.55 mm (including the thickness of the release film).

[0031] Example 1

[0032] Based on the above, this invention provides a protective layer for an installation-free magnetic lamp in an oilfield. The protective layer is attached to the magnetic suction plate of the lamp, and multiple evenly distributed magnets are mounted on the magnetic suction plate. These magnets are neodymium iron boron magnets, and the static attraction force of a single magnet is greater than 20 kg (22 kg in this application). Figure 1 As shown, this embodiment of the installation-free magnetic lamp includes an adsorption upper plate 1 and a mounting plate 2. The adsorption upper plate 1 has openings, and magnet sleeves 3 are correspondingly placed at the opening positions. Magnets 4 are installed in the magnet sleeves 3 for adsorption. The mounting plate 2 is installed on the adsorption upper plate 1 by fixing screws. A lamp holder or a lamp can be directly installed on the mounting plate 2. The mounting plate has hanging rings for easy detachment. The magnets are located at the four corners of the square adsorption upper plate, arranged symmetrically. The magnetic plate surface is the surface of the adsorption upper plate 1 used for adsorption with the iron-based carrier, as shown... Figure 2 As shown; The protective layer includes a base layer and a release layer. The base layer is fully coated on the magnetic suction plate surface of the installation-free magnetic lamp. The release layer covers the base layer and the area of ​​the release layer is larger than the area of ​​the magnetic suction plate surface. The thickness of the base layer is 0.04 mm. The thickness of the release layer is 0.5 mm. The bottom layer comprises the following components in parts by weight: 48 parts isocyanate-modified fluorocarbon resin, 22 parts NHS activated ester modified mica flake modified nano-magnetic powder composite, 10 parts ethylene-vinyl alcohol copolymer, 15 parts n-butyl acetate, 3 parts dibutyl phthalate, 2 parts polycarboxylate dispersant, and 4 parts 3-isocyanate-propyltrimethoxysilane; the polycarboxylate dispersant actually uses DS8637 comb-structured polycarboxylate nano-dispersant. The release layer comprises the following components in parts by weight: 42 parts isocyanate-modified fluorocarbon resin, 34 parts acrylate polyol, 10 parts poly(N-isopropylacrylamide) modified pressure-sensitive adhesive microspheres, and 2 parts silane coupling agent (KH550 silane coupling agent is used).

[0033] The bottom layer is prepared by the following method: ethylene-vinyl alcohol copolymer is dissolved in dimethyl sulfoxide to obtain an ethylene-vinyl alcohol copolymer solution; isocyanate-modified fluorocarbon resin and n-butyl acetate are uniformly mixed, and then the ethylene-vinyl alcohol copolymer solution is added under stirring. After mixing evenly, dibutyl phthalate, polycarboxylate dispersant, 3-isocyanate-based propyltrimethoxysilane, and NHS activated ester modified mica flake modified nano-magnetic powder composite are added sequentially under stirring. After stirring evenly, the mixture is dispersed at high speed (1200-1500 r / min) to obtain the bottom layer slurry; the slurry is uniformly coated on a clean and dry magnetic plate surface and completely cured at 65°C to obtain the bottom layer.

[0034] The release layer is prepared by the following method: isocyanate-modified fluorocarbon resin and acrylate polyol are mixed in a dry container, and after uniform mixing, a silane coupling agent is added and the mixture is stirred until uniform. Then, poly(N-isopropylacrylamide) modified pressure-sensitive adhesive microspheres are slowly added at a stirring speed of 200 r / min. After the poly(N-isopropylacrylamide) modified pressure-sensitive adhesive microspheres are added and uniformly dispersed, a mixed adhesive solution is obtained. The mixed adhesive solution is vacuum degassed and then uniformly coated onto a release film. It is then completely cured at 50°C. After complete curing, it is cooled to 20°C to obtain the release layer. In use, the side of the release layer that is different from the release film is pressed and adhered to the bottom layer to bond the release layer to the magnetic plate surface. When it is necessary to peel off the release layer, the release layer is heated to about 40°C to reduce the adhesion strength between the release layer and the magnetic plate surface. After the release layer is peeled off, it has relatively strong adhesion again at a low temperature (20°C) and can be reused.

[0035] When the magnetic lamp in this application is not in use or for illumination, the release layer is attached to the outside of the bottom layer, and the release layer and the bottom layer work together to provide double protection for the magnetic plate surface.

[0036] Example 2

[0037] The embodiment is based on the embodiment 1, different from the embodiment 1, the bottom layer in the embodiment includes the following components by weight: 52 parts of isocyanate group modified fluorocarbon resin, 25 parts of NHS activated ester modified mica flake modified nanometer magnetic powder compound, 11 parts of ethylene-vinyl alcohol copolymer, 16.5 parts of n-butyl acetate, 4 parts of dibutyl phthalate, 2.5 parts of polycarboxylate dispersant, 4.5 parts of 3-isocyanate group propyl trimethoxysilane; the polycarboxylate dispersant actually uses DS8637 comb structure polycarboxylate nanodispersion; The release layer includes the following components by weight: 45 parts of isocyanate group modified fluorocarbon resin, 35 parts of acrylate polyol, 11 parts of poly N-isopropyl acrylamide modified pressure sensitive adhesive microspheres, 2.5 parts of silane coupling agent (the silane coupling agent uses KH550 silane coupling agent). The rest is consistent with the embodiment 1.

[0038] Example 3

[0039] The embodiment is based on the embodiment 1, different from the embodiment 1, the bottom layer in the embodiment includes the following components by weight: 52 parts of isocyanate group modified fluorocarbon resin, 25 parts of NHS activated ester modified mica flake modified nanometer magnetic powder compound, 11 parts of ethylene-vinyl alcohol copolymer, 16.5 parts of n-butyl acetate, 4 parts of dibutyl phthalate, 2.5 parts of polycarboxylate dispersant, 4.5 parts of 3-isocyanate group propyl trimethoxysilane; the polycarboxylate dispersant actually uses DS8637 comb structure polycarboxylate nanodispersion; The release layer includes the following components by weight: 48 parts of isocyanate group modified fluorocarbon resin, 36 parts of acrylate polyol, 12 parts of poly N-isopropyl acrylamide modified pressure sensitive adhesive microspheres, 3 parts of silane coupling agent (the silane coupling agent uses KH550 silane coupling agent). The rest is consistent with the embodiment 1.

[0040] Example 4

[0041] The embodiment is based on the embodiment 1, different from the embodiment 1, the bottom layer in the embodiment includes the following components by weight: 52 parts of isocyanate group modified fluorocarbon resin, 25 parts of NHS activated ester modified mica flake modified nanometer magnetic powder compound, 11 parts of ethylene-vinyl alcohol copolymer, 16.5 parts of n-butyl acetate, 4 parts of dibutyl phthalate, 2.5 parts of polycarboxylate dispersant, 4.5 parts of 3-isocyanate group propyl trimethoxysilane; the polycarboxylate dispersant actually uses DS8637 comb structure polycarboxylate nanodispersion;

[0042] Example 5

[0043] The embodiment is based on the embodiment 1, different from the embodiment 1, the bottom layer in the embodiment includes the following components by weight: 52 parts of isocyanate group modified fluorocarbon resin, 25 parts of NHS activated ester modified mica flake modified nanometer magnetic powder compound, 11 parts of ethylene-vinyl alcohol copolymer, 16.5 parts of n-butyl acetate, 4 parts of dibutyl phthalate, 2.5 parts of polycarboxylate dispersant, 4.5 parts of 3-isocyanate group propyl trimethoxysilane; the polycarboxylate dispersant actually uses DS8637 comb structure polycarboxylate nanodispersion;

[0044] Comparative example 1 Based on the embodiment 1, as Figure 1 , Figure 2As shown, the installation-free magnetic lamp holder provided by the present comparative example comprises an adsorption upper plate 1 and a mounting plate 2. The adsorption upper plate 1 is provided with a hole, and a magnet sleeve 3 is arranged at the position of the hole. The magnet sleeve 3 is provided with a magnet 4 for adsorption. The mounting plate 2 is mounted on the adsorption upper plate 1 by a fixing screw 201, and a lamp hanger or a lamp is directly mounted on the mounting plate 2. The magnet is a neodymium-iron-boron magnet, and the single static adsorption force is greater than 20 kg. The magnetic adsorption plate surface of the adsorption upper plate 1 is exposed to the neodymium-iron-boron magnet. Figure 2 As shown, the neodymium-iron-boron magnet is exposed. The magnetic adsorption plate surface is not attached to a protective layer.

[0045] Comparative Example 2 Based on Example 1, the difference between Example 1 and the present comparative example is that the protective layer in the present comparative example does not comprise a release layer, but only comprises a bottom layer. The remaining parts are consistent.

[0046] Comparative Example 3 Based on Example 1, the difference between Example 1 and the present comparative example is that the bottom layer in the present comparative example does not add the modified nano-magnetic powder composite of the mica flake modified by the NHS activated ester. The remaining parts are consistent.

[0047] Comparative Example 4 Based on Example 1, the difference between Example 1 and the present comparative example is that the bottom layer in the present comparative example uses unmodified nano-magnetic powder instead of the modified nano-magnetic powder composite of the mica flake modified by the NHS activated ester in Example 1. The nano-magnetic powder in the present comparative example is composed of nano-carbonyl iron powder and nano-magnetic powder of magnetite, and the mass ratio of the nano-carbonyl iron powder to the nano-magnetic powder of magnetite is 3:2.2. The particle size of the nano-carbonyl iron powder is 60-80 nm, and the particle size of the nano-magnetic powder of magnetite is 50-70 nm. The remaining parts are consistent.

[0048] Comparative Example 5 Based on Example 1, the difference between Example 1 and the present comparative example is that the mica flake in the bottom layer of the present comparative example is not modified by the NHS activated ester, but is directly compounded with the nano-magnetic powder to replace the modified nano-magnetic powder composite of the mica flake modified by the NHS activated ester in Example 1. The preparation method is as follows: the nano-magnetic powder is composed of nano-carbonyl iron powder and nano-magnetic powder of magnetite, and the mass ratio of the nano-carbonyl iron powder to the nano-magnetic powder of magnetite is 3:2.2. The particle size of the nano-carbonyl iron powder is 60-80 nm, and the particle size of the nano-magnetic powder of magnetite is 50-70 nm. The nano-magnetic powder and the mica flake are physically blended according to a mass ratio of 2.8:1 to obtain a mixture. The mixture replaces the modified nano-magnetic powder composite of the mica flake modified by the NHS activated ester in Example 1. The remaining parts are consistent.

[0049] Comparative Example 6 Based on Example 1, the difference between Example 1 and the present comparative example is that the release layer in the present comparative example does not contain the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres. The remaining parts are consistent.

[0050] Comparative Example 7 Based on Example 1, different from Example 1, the pressure-sensitive adhesive microspheres in the peeling layer are not modified with poly-N-isopropyl acrylamide, and based on the preparation method of Example 1, N-isopropyl acrylamide is not added in the preparation of the pressure-sensitive adhesive microspheres, and the remaining parameters are adjusted adaptively; the remaining parts are consistent.

[0051] Test Example 1 The magnetic adsorption firmness between the magnetic adsorption plate surface of the upper plate and the iron-based carrier and the oil stain resistance and rust resistance of the magnetic adsorption surface of the magnetic lamp in Example 1-5 (without a peeling layer, only a bottom layer), Comparative Examples 3-5 (without a peeling layer, only a bottom layer), and Comparative Example 1 were detected, and the results are shown in Table 1. Magnetic adsorption firmness detection: the magnetic lamp in each example / Comparative Example was completely adsorbed on the surface of a clean and flat Q235 steel plate (the steel plate was fixed and square with a side length of 300 mm and a thickness of 10 mm) by the magnetic adsorption plate surface; a digital pull force gauge (range 500 N, accuracy 0.1 N) was vertically applied to the magnetic lamp (the digital pull force gauge hooked the lifting ring of the magnetic lamp mounting plate), and the maximum pulling force value (separation force F) at the moment of separation of the magnetic lamp and the steel plate was recorded at a constant speed (about 5 mm / s); the greater the separation force (F), the better the magnetic adsorption firmness. Oil stain resistance test: only the magnetic lamp adsorption upper plate was used as the test sample (an independent part separated from the magnetic lamp), and the following items were tested: (1) the oil-repellent contact angle of the magnetic adsorption plate surface of the magnetic lamp adsorption upper plate was measured (according to the existing measurement method, the oil-repellent contact angle of the neodymium-iron-boron magnet area was measured); (2) before applying oil stains, the sample was weighed to obtain the initial weight M0; simulated oil field oil stains (crude oil:diesel oil=3:1, mass ratio) were uniformly applied to the magnetic adsorption plate surface of each sample with a brush, the application thickness was 0.5 mm, and the sample was placed in a 25°C constant temperature environment for 24 h; the sample was weighed to obtain the weight M1, the oil stain weight was calculated, and the oil stain weight M 油 =M1-M0; the sample was wiped with anhydrous ethanol cotton three times with the same force, the treated sample was weighed to obtain the treated weight M2, the oil stain residue was calculated, and the oil stain residue rate = (M2-M0) / M 油 ×100%, the smaller the oil stain residue rate, the better the oil stain resistance; Anti-rust test: only the upper plate of the magnetic lamp (an independent part separated from the magnetic lamp as a sample) was taken as the test object, the sample (with the magnetic plate facing up) was placed in a salt spray test chamber, and a neutral salt spray test (NSS) was performed according to GB / T 10125-2021. After 48 hours of continuous spraying, the sample was taken out, washed with deionized water and dried, and the rust on the surface of the magnetic plate (magnet area) was observed.

[0052] Table 1 Performance test results of the surface of the magnetic plate Separation force of magnetic lamp from steel plate Oil repellency contact angle of magnetic plate surface Oil stain residue rate of magnetic plate surface Rusting condition Example 1 451±1 ＞100° 1.9±0.1% No rusting condition Example 2 465±1 ＞100° 1.5±0.1% No rusting condition Example 3 458±1 ＞100° 1.6±0.1% No rusting condition Example 4 460±1 ＞100° 2.2±0.1% No rusting condition Example 5 453±1 ＞100° 1.5±0.1% No rusting condition Comparative Example 1 471±1N ＜90° 18.6±0.1% Obvious rusting, rusting area more than 20% Comparative Example 3 312±1N ＞100° 4.3±0.1% No rusting condition Comparative Example 4 368±1N ＞100° 3.2±0.1% No rusting condition Comparative Example 5 352±1N ＞100° 3.5±0.1% No rusting condition Compared with the magnetic lamp of the comparative example 1 (without protection), the application improves the oil stain resistance and anti-rust performance of the surface of the magnetic plate while reducing the influence of the bottom layer on the firmness of the magnetic attraction. The magnetic strength (separation force) of the magnetic plate with the bottom layer in the application is reduced by less than 5% compared with the magnetic plate without the bottom layer (comparative example 1), and the magnetic plate still has good magnetic attraction firmness in actual use. If the bottom layer does not contain the NHS activated ester modified mica flake modified nano magnetic powder composite, the magnetic strength is reduced by more than 30% compared with the comparative example 1, and the magnetic attraction is not firm during use.

[0053] Test example 2 Based on the sample size of test example 1, only the upper plate of the magnetic lamp (an independent part separated from the magnetic lamp) was taken as the test sample, and the magnetic attraction of the magnetic surface of the magnetic lamp to iron filings and the peeling strength between the peeling layer and the magnetic surface of the magnetic lamp coated with the bottom layer in examples 1-5 (containing a peeling layer), comparative examples 6 and 7 (containing a peeling layer), and comparative example 1 were detected, and the results are shown in Table 2.

[0054] Magnetic attraction test of the magnetic plate surface with the peeling layer to iron filings: the magnetic surface of the sample was placed above a container containing standard iron filings (particle size 100-200 mesh) with the magnetic surface facing down (the distance between the peeling layer and the top layer of the iron filings was 1 cm), and after 10 minutes of standing, the sample was taken out and the surface of the magnetic surface (peeling layer) was observed for adhesion of iron filings; Peeling strength test between the peeling layer and the magnetic surface of the magnetic lamp coated with the bottom layer: according to GB / T 2792-2014, a universal material testing machine was used to perform a 90° peeling test. After the peeling layer was attached to the corresponding bottom layer sample, it was placed in the testing machine, and the peeling was performed at 25°C (peeling layer temperature) and 40°C (peeling layer temperature) at a speed of 300 mm / min, and the average peeling force in the stable peeling stage was recorded.

[0055] Table 2 Performance test of the peeling layer Magnetic condition of stripping layer to iron filings Stripping strength of stripping layer at 25°C (N / cm) Stripping strength of stripping layer at 40°C (N / cm) Example 1 Surface without visible iron filings adhesion 1.6~1.7 0.4~0.5 Example 2 Surface without visible iron filings adhesion 1.8~1.9 0.4~0.5 Example 3 Surface without visible iron filings adhesion 1.8~1.9 0.4~0.5 Example 4 Surface without visible iron filings adhesion 1.6~1.7 0.4~0.5 Example 5 Surface without visible iron filings adhesion 1.8~1.9 0.4~0.5 Comparative Example 6 Surface without visible iron filings adhesion 0.3~0.4 0.3~0.4 Comparative Example 7 Surface without visible iron filings adhesion 1.2~1.3 1.2~1.3 The poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres in the application, the introduction of poly-N-isopropyl acrylamide, on the one hand, can improve the peeling strength of the release layer and improve its adhesion; on the other hand, it has temperature sensitivity. After the peeling strength is improved, in order to facilitate peeling, based on its temperature sensitivity, the peeling strength is reduced under heating conditions, which facilitates complete peeling and repeated use.

[0056] Test Example 3 Based on the test sample of Test Example 2, the peeling strength of the release layer after repeated use for a certain number of times in Examples 1-5 was detected, and the results are shown in Table 3. The detection method is: the same piece of release layer and its corresponding example / contrast sample containing the bottom layer are subjected to the cycle of "adhesion (25℃ normal temperature)→ heating peeling (40℃)→ cooling (20℃ for 10 minutes)→ re-adhesion". After the 10th cycle, the peeling strength measured at 25℃ (normal temperature) is recorded (refer to the test method of Test Example 2).

[0057] Table 3 Performance detection of the number of cycles of the release layer Stripping strength at 25°C after 10th cycle (N / cm) Example 1 1.4~1.5 Example 2 1.7~1.8 Example 3 1.6~1.7 (not reaching 1.7) Example 4 1.5~1.6 Example 5 1.6~1.7 The adhesion (peeling strength) after 10 cycles of the application can reach more than 90% of the initial peeling strength (25℃), and the application can be repeatedly used for more than 10 times.

[0058] The above only describes the preferred embodiments of the application and does not limit the protection scope of the application. Any modification, equivalent replacement and improvement made by those skilled in the art within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A protective layer for a magnetic installation-free light in an oilfield site, the protective layer being attached to a magnetic plate surface of the magnetic installation-free light, the magnetic plate surface of the magnetic installation-free light being provided with a plurality of magnets evenly distributed thereon, the magnets being neodymium-iron-boron magnets, and a single magnet having a static attraction force greater than 20 kg, characterized in that: The protective layer comprises a bottom layer and a peeling layer, the bottom layer is coated on the surface of the magnetic plate of the installation-free magnetic force lamp, and the peeling layer is coated on the bottom layer and has an area greater than that of the surface of the magnetic plate; ​ The bottom layer comprises the following components in parts by weight: 48-55 parts of isocyanate group modified fluorocarbon resin, 22-28 parts of NHS activated ester modified mica flake modified nanometer magnetic powder compound, 10-12 parts of ethylene-vinyl alcohol copolymer, 15-18 parts of n-butyl acetate, 3-5 parts of dibutyl phthalate, 2-3 parts of polycarboxylate dispersant, and 4-5 parts of 3-isocyanate group propyl trimethoxysilane. The peeling layer comprises the following components in parts by weight: 42-48 parts of isocyanate group modified fluorocarbon resin, 34-36 parts of acrylate polyol, 10-12 parts of poly N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres, and 2-3 parts of silane coupling agent.

2. A protective layer for a field-mounted magnetic light for an oilfield according to claim 1, wherein: The nanometer magnetic powder is composed of nanometer carbonyl iron powder and nanometer magnetite magnetic powder, and the mass ratio of the nanometer carbonyl iron powder to the nanometer magnetite magnetic powder is 3: (2-2.5); the particle size of the nanometer carbonyl iron powder is 60-80 nm, and the particle size of the nanometer magnetite magnetic powder is 50-70 nm.

3. A protective layer for a field-mounted magnetic light for an oilfield according to claim 2, wherein: The NHS activated ester modified mica flake modified nanometer magnetic powder compound is prepared by the following method: S1.1, uniformly mix nanometer carbonyl iron powder and nanometer magnetite magnetic powder to obtain nanometer magnetic powder, add the nanometer magnetic powder into an ethanol aqueous solution with a volume ratio of 3:1, ultrasonically disperse to obtain a nanometer magnetic powder suspension; Add 3-aminopropyl triethoxysilane with a mass of 5% of the nanometer magnetic powder to the nanometer magnetic powder suspension, heat to 60 DEG C, and react for 2-2.5 hours under stirring, filter and dry to obtain pretreated nanometer magnetic powder; S1.2, add mica flake into dichloromethane with a solid-liquid ratio of 1:10 g / ml, uniformly stir, add succinic anhydride with a mass of 9% of the mica flake, heat to 70 DEG C, and react for 3 hours under constant temperature stirring, then filter to obtain modified mica flake; Disperse the modified mica flake into MES buffer solution with a pH of 6, then add EDC and NHS with a molar ratio of 1: (1.3-1.5), react for 3 hours at room temperature, filter and dry the precipitate to obtain NHS activated ester modified mica flake; S1.3, mix the pretreated nanometer magnetic powder and the NHS activated ester modified mica flake according to a mass ratio of (2.7-2.9):1 to obtain a mixture, disperse the mixture into phosphate buffer solution with a pH of 7.3-7.5, react for 2-3 hours at room temperature, then filter and dry the precipitate to obtain NHS activated ester modified mica flake modified nanometer magnetic powder compound.

4. A protective layer for a field-mounted magnetic light of claim 1, wherein: The bottom layer and the peeling layer adopt the same isocyanate group modified fluorocarbon resin; the isocyanate group modified fluorocarbon resin is prepared from diisocyanate, fluorocarbon resin and modified acrylic monomer with a molar ratio of 2:1:1 as raw materials; The modified acrylic monomer is prepared by mixing mercaptan, acrylic monomer and photoinitiator under the protection of inert gas, and performing mercapto-vinyl click reaction at room temperature to obtain a modified acrylic monomer with a hydroxyl end.

5. A protective layer for a field-mounted magnetic light of claim 1, wherein: The poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres are prepared by the following method: taking deionized water, adding sodium dodecyl sulfate in an amount of 0.3% of the mass of the deionized water, stirring and dissolving, then adding butyl acrylate, methyl methacrylate and N-isopropyl acrylamide, stirring uniformly, ultrasonic dispersion for 10 min to form a uniform emulsion system; nitrogen is introduced into the emulsion system to remove oxygen in the system, then ammonium persulfate is added, the amount of ammonium persulfate is 0.5% of the total mass of butyl acrylate, methyl methacrylate and N-isopropyl acrylamide, the temperature is raised to 70℃, constant temperature stirring is carried out for 16-18h, then filtration, washing and drying are carried out to obtain the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres.

6. A protective layer for a field-mounted magnetic light for an oilfield according to claim 1, wherein: The ethylene-vinyl alcohol copolymer is obtained by copolymerization of ethylene and vinyl alcohol in a mass ratio of 2.8: (7~7.3).

7. A protective layer for a field-mounted magnetic light for an oilfield according to claim 1, wherein: The bottom layer is prepared by the following method: dissolving the ethylene-vinyl alcohol copolymer in an organic solvent to obtain an ethylene-vinyl alcohol copolymer solution; uniformly mixing the isocyanate group modified fluorocarbon resin and n-butyl acetate, then adding the ethylene-vinyl alcohol copolymer solution under stirring, uniformly mixing, then adding dibutyl phthalate, polycarboxylate dispersant, 3-isocyanate propyl trimethoxysilane, and NHS activated ester modified mica flake modified nano magnetic powder compound under stirring in sequence, uniformly stirring, then high-speed dispersion to obtain a bottom layer slurry; uniformly coating the slurry on the surface of a clean and dry magnetic plate, and curing to obtain the bottom layer.

8. A protective layer for a field-mounted magnetic light of claim 1, wherein: The release layer is prepared by the following method: mixing the isocyanate group modified fluorocarbon resin and acrylate polyol in a dry container, uniformly mixing, then adding the silane coupling agent and continuing to stir uniformly, then slowly adding the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres under stirring at a speed of 200-300 r / min, obtaining a mixed glue solution after the poly-N-isopropyl acrylamide modified pressure-sensitive adhesive microspheres are added and uniformly dispersed, uniformly coating the mixed glue solution on the release film after vacuum degassing, completely curing at 45-55℃, cooling to 20℃ after complete curing to obtain the release layer; in use, the release layer is pressed and attached to the bottom layer on the side different from the release film to attach the release layer to the surface of the magnetic plate.

9. A protective layer for a field-mounted magnetic light of claim 1, wherein: The thickness of the bottom layer is 0.03-0.05mm.

10. A protective layer for a field-mounted magnetic light of claim 1, wherein: The thickness of the release layer is 0.45-0.55mm.

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