High-temperature-resistant aerosol for isolating adhesion of welding slag and preparation method of high-temperature-resistant aerosol

Abstract

The invention relates to the technical field of novel functional chemical materials, in particular to a high-temperature-resistant aerosol for isolating adhesion of welding slag and a preparation method of the high-temperature-resistant aerosol. The aerosol is composed of a functional film-forming liquid and a propellant, wherein the functional film-forming liquid comprises the following components in parts by weight: 15-20 parts of polyketone resin, 70-75 parts of ethanol, 3-5 parts of a stripping agent, 0.2-0.3 part of a dispersing agent, 0.1-0.3 part of a flatting agent, 0.01-0.03 part of a corrosion inhibitor and a proper amount of a viscosity modifier; the stripping agent is obtained by mechanically grinding and modifying spherical inorganic powder and stearate. The high-temperature-resistant polyketone resin and the spherical stripping agent are used in the aerosol, so that after the aerosol is sprayed to form a film, instant high-temperature welding slag drop points can be prevented from being adhered to ablate the surface of a metal part, and the quality of a welding part is effectively protected. And meanwhile, the peelability on the surface of a welding piece is considered. After welding is completed, the spraying film layer can be easily stripped and torn off, and cleaning with acid, alkali and detergent is not needed.

Description

Technical Field

[0001] The present invention relates to the technical field of functional chemical new materials, and particularly relates to a high-temperature resistant aerosol for isolating the adhesion of welding slag and a preparation method thereof. Background Art

[0002] Metal welding forms a molten region by quickly heating to locally melt the metal workpiece (or melt the solder), and the molten pool cools and solidifies to connect. Whether it is arc welding, argon arc welding, laser welding or gas flame welding, during the welding process, the local temperature around the molten metal slag is extremely high, resulting in instantaneous water evaporation or gas impact caused by the combustion of impurities, causing the molten pool to fluctuate violently and splash to form welding slag. The splashed welding slag has extremely high temperature. If it falls on the edge of the weld, it will solidify and adhere near the weld at high temperature, seriously affecting the quality of the welded part; if the welding slag falls on other surfaces of the workpiece and adheres to form welding slag particles, it will not only affect the surface size fineness and aesthetics of the workpiece, but may also produce ablation points and reduce the corrosion resistance of the workpiece. For slight welding slag adhesion, grinding is required to remove it; for severe adhesion, repair by re-welding is required, which takes a lot of labor and time and increases the manufacturing cost.

[0003] Especially at present, precision laser welding is adopted in the fields of electronic parts, automobile manufacturing, aerospace, etc. It is more important to avoid damage to the surface of precision workpieces by splashed welding slag. During the laser welding process, a laser beam with a high energy density acts on the metal material, melting the metal rapidly in a short time. Due to the pressure change inside the molten pool, the melted metal will be carried out of the molten pool to form splashes. Even if tiny splashed welding slag adheres to the surface of the welded part, it will leave burn marks that are difficult to remove, seriously affecting the appearance, dimensional accuracy and corrosion resistance of precision metal parts, resulting in quality defects of the welded parts.

[0004] In order to solve the negative impact caused by the adhesion of welding slag, during the welding operation, a covering protective pad is usually used to prevent the welding slag from directly adhering to the surface of the workpiece. The protective pad is mainly made of high-temperature resistant materials and can effectively protect the surface of the metal workpiece from being contaminated by welding slag. However, due to the various shapes of the workpieces, the protective pad needs to be made into various shapes and sizes, which is extremely inconvenient to use. Moreover, for precision small parts with special-shaped structures, the protective pad is difficult to effectively protect.

[0005] In the prior art, in order to improve the quality of precision welding and prevent the welding slag from adhering to the surface of the workpiece, an anti-adhesive agent is evenly applied on the surface of the workpiece, which can preferably prevent the welding slag from adhering to the workpiece. However, this type of applied anti-adhesive agent is inconvenient to apply, and the instantaneous temperature of the splashed welding slag can reach 500 - 1000 °C. The high-temperature resistance of the coating layer is limited, and the high-temperature welding slag is easy to burn through the anti-adhesive agent coating. In addition, it is difficult to remove the coating layer after welding, and acid-base solution or detergent is required to clean the coating layer, increasing the workload of the welding operation. Summary of the Invention

[0006] In order to overcome the above-mentioned disadvantages of the prior art and prevent the adhered and ablated damage of the splashed welding slag to the metal workpiece during precision welding, the present invention proposes a high-temperature resistant aerosol for isolating the adhesion of welding slag and a preparation method thereof. The aim is to obtain an aerosol that can form a uniform high-temperature resistant protective film on the surface of the welded metal workpiece, prevent the welding slag from adhering to and burning the surface of the metal workpiece, and the protective film is easy to peel off and remove after welding is completed.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0008] First of all, the present invention provides a high-temperature resistant aerosol for isolating the adhesion of welding slag, which is characterized in that it is composed of a functional film-forming liquid and a propellant in a mass ratio of 100:(30 - 40); wherein:

[0009] The functional film-forming liquid is composed of the following raw materials in parts by weight: 15 - 20 parts of polyketone resin, 70 - 75 parts of ethanol, 3 - 5 parts of a release agent, 0.2 - 0.3 parts of a dispersant, 0.1 - 0.3 parts of a leveling agent, 0.01 - 0.03 parts of a corrosion inhibitor, and an appropriate amount of a viscosity regulator; the release agent is obtained by mechanically grinding and modifying spherical inorganic powder and stearate in a mass ratio of 100:(5 - 7); the viscosity regulator is added in an appropriate amount to adjust the viscosity of the functional film-forming liquid at 25°C to 80 - 100 mPa·s;

[0010] The propellant is one of nitrogen and carbon dioxide.

[0011] As a preference of the present invention, the polyketone resin selects a polyketone resin with a hydroxyl value of 90 - 120 mgKOH / g and a molecular weight of 1400 - 1600. The polyketone resin has a low viscosity when dissolved in ethanol, has good film-forming properties and fast drying properties after spraying, and shows excellent high-temperature resistance. Selecting a high-molecular-weight polyketone resin has excellent high-temperature resistance.

[0012] As a preference of the present invention, the spherical inorganic powder selects at least one of spherical silica, spherical glass beads, and spherical alumina; the average particle size of the spherical inorganic powder is 1 - 10 µm. Through the mechanical grinding and modification of the spherical inorganic powder and stearate, it is stably dispersed in the functional film-forming liquid. After spraying and forming a film, the spherical release agent prevents the film layer from overly adhering to the metal part, increases the peelability of the film layer; at the same time, it will enhance the high-temperature resistance of the film layer, enabling the film layer to instantaneously withstand temperatures above 500°C.

[0013] As a preference of the present invention, the stearate is at least one of zinc stearate and calcium stearate.

[0014] As a preference of the present invention, the dispersant selects at least one of sodium pyrophosphate and sodium hexametaphosphate. It can effectively promote the dispersion of the release agent in ethanol.

[0015] Preferably in the present invention, the leveling agent is a polyether-modified polysiloxane, which has extremely low surface tension, good wettability and emulsifying dispersibility.

[0016] Preferably in the present invention, the corrosion inhibitor is a selective adsorption corrosion inhibitor, and at least one of tallow amine, benzotriazole, octadecylamine, and 2-mercaptobenzothiazole is particularly preferred. The selective adsorption corrosion inhibitor is easy to adsorb on the metal surface to form a protective film, inhibiting the contact between the metal and the corrosive medium, thereby avoiding the corrosion of the aerosol to the metal. Further specifically, when used for welding non-ferrous metals such as copper, benzotriazole is preferably used as the selective adsorption corrosion inhibitor.

[0017] Preferably in the present invention, the viscosity regulator is at least one of triethylene glycol and polyvinylpyrrolidone. The viscosity regulator is added in an appropriate amount to adjust the viscosity of the functional film-forming component at 25 °C to 90 mPa·s. The reasonable viscosity not only ensures that the film-forming component forms a uniform film and levels after spraying, but also the relatively high viscosity moderately wraps the volatile solvent during aerosol spraying to form microbubbles, increasing the film thickness and making it easy to peel off.

[0018] In the present invention, polyketone resin is dissolved in ethanol and a spherical release agent with a high addition amount is selected. By adjusting the viscosity of the functional film-forming liquid to a relatively high viscosity level, the aerosol formed after spraying has excellent film-forming performance, dries quickly during spraying, and the formed film layer performs well in a high-temperature environment and can withstand a high temperature of up to 500 °C in a short time. When used for isolating the adhesion of welding slag to the surface of precision metal workpieces during welding, its protective effect is remarkable. By moderately increasing the viscosity, the volatile solvent is moderately wrapped during aerosol spraying to form microbubbles, increasing the film thickness. The spherical release agent prevents the formed film layer from strongly adhering to the metal surface, and after welding is completed, the film layer is easy to peel off.

[0019] Furthermore, the present invention provides a preparation method for a high-temperature resistant aerosol for isolating the adhesion of welding slag, and the specific preparation method is as follows:

[0020] S1. A spherical inorganic powder and a stearate are mechanically ground and modified in a mass ratio of 100:(5 - 7) to obtain a release agent;

[0021] S2. By weight, 15 - 20 parts of polyketone resin and 70 - 75 parts of ethanol are added to a vertical grinder. Through low-speed stirring, the polyketone resin is completely dissolved in ethanol under the impact of the grinding medium to form a solution; then, 3 - 5 parts of the release agent, 0.2 - 0.3 parts of a dispersant, 0.1 - 0.3 parts of a leveling agent, and 0.01 - 0.03 parts of a corrosion inhibitor are added to the solution in the vertical grinder, and high-speed stirring and dispersion are carried out. The grinding medium is removed by sieving and separation, and an appropriate amount of viscosity regulator is added to adjust the viscosity at 25 °C to 80 - 100 mPa·s to obtain a functional film-forming liquid;

[0022] S3. Using a tinplate can as the container, the functional film-forming liquid obtained in step S2 is metered and filled under normal pressure, sealed, and propellant is filled in according to the mass ratio of the functional film-forming liquid to the propellant of 100:(30 - 40). After weighing detection and water bath detection, a nozzle is installed to obtain a high-temperature resistant aerosol for isolating the adhesion of welding slag.

[0023] As a preference of the present invention, in step S1, the mechanical grinding modification is carried out by at least one of a ball mill, a vibration mill, a planetary mill, and a jet mill.

[0024] As a preference of the present invention, in step S2, the rotational speed of the low-speed stirring shaft of the vertical mill is 700 r / min; the rotational speed of the high-speed stirring shaft is 1300 r / min.

[0025] As a preference of the present invention, in step S2, the grinding medium in the vertical mill is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 20 - 30% of the solution volume.

[0026] As a preference of the present invention, in step S3, the pressure after filling the propellant is 0.60 - 0.75 MPa.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. The components of the aerosol of the present invention have good film-forming and shaping properties, and quickly dry and solidify into a protective film after spraying.

[0029] 2. The aerosol of the present invention is blended with a high-temperature resistant polyketone resin and a spherical release agent, and has excellent high-temperature resistance. After the aerosol forms a film, it can prevent the instantaneous high temperature of the welding slag landing point from burning through the film layer.

[0030] 3. By adjusting the relatively high viscosity, the aerosol of the present invention is easy to wrap the volatile solvent to form microbubbles during spraying, increasing the film thickness, taking into account the adhesion and peelability on the surface of metal workpieces. After welding is completed, the sprayed film layer can be easily peeled off without the need for acid, alkali, or detergent cleaning, greatly simplifying the operation.

[0031] 4. The aerosol of the present invention is used to isolate the adhesion of welding slag, significantly solving the problem that the splashing welding slag during welding damages the surface quality of the welded parts. It is easy to form a continuous and uniform protective layer on the surface of precision, complex, and irregular parts, with fast film formation, rapid drying at room temperature without baking; after the welding protection is completed, the film layer is easy to peel off from the metal parts, which is convenient to use. Specific embodiments

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0033] Some raw materials involved in the following implementation schemes:

[0034] Polyketone resin: CT-130, molecular weight 1450 - 1550, hydroxyl value 110 ± 10 mgKOH / g, provided by Jinan Changtai Chemical Co., Ltd.

[0035] Spherical silica: model JL-SiO2-W03, average particle size 3 µm, provided by Ningbo Jinlei Nanomaterials Technology Co., Ltd.

[0036] Spherical alumina: model BSL-Al2O3-B10, average particle size 10 µm, provided by Beasley New Materials (Suzhou) Co., Ltd.

[0037] Spherical glass microspheres: average particle size 10 µm, provided by Hebei Wensheng New Materials Technology Co., Ltd.

[0038] Example 1

[0039] S1. Grind and modify spherical silica and calcium stearate in a ball mill at a mass ratio of 100:5 for 20 min to obtain a release agent.

[0040] S2. By weight, add 18 parts of polyketone resin and 75 parts of ethanol to a vertical grinder, stir at a low speed of 700 r / min for 30 min, and under the impact of the grinding medium, the polyketone resin is completely dissolved in ethanol to form a solution; among them, the grinding medium is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 25% of the solution volume; then, add 5 parts of the release agent, 0.2 part of the dispersant sodium pyrophosphate, 0.1 part of the leveling agent polyether-modified polysiloxane, and 0.01 part of the corrosion inhibitor tallow amine to the solution in the vertical grinder, stir and grind and disperse at a high speed of 1300 r / min for 15 min, screen and separate to remove the grinding medium, add 0.08 part of the viscosity regulator triethylene glycol, and adjust the viscosity at 25°C to 90 mPa·s to obtain a functional film-forming liquid.

[0041] S3. Use a tinplate can as a container to measure and fill the functional film-forming liquid obtained in step S2 at normal pressure, seal the valve, fill in the propellant nitrogen according to the mass ratio of the functional film-forming liquid to the propellant of 100:35, the container pressure is 0.70 MPa, after weighing detection and water bath detection, install a nozzle to obtain a high-temperature aerosol for isolating the adhesion of welding slag.

[0042] Example 2

[0043] S1. Grind and modify spherical alumina and zinc stearate in a ball mill at a mass ratio of 100:6 for 30 min to obtain a release agent.

[0044] S2. By weight, add 16 parts of polyketone resin and 70 parts of ethanol to a vertical grinder, stir at a low speed of 700 r / min for 25 min, and under the impact of the grinding medium, the polyketone resin is completely dissolved in ethanol to form a solution; among them, the grinding medium is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 30% of the solution volume; then, add 4 parts of the release agent, 0.3 part of the dispersant sodium hexametaphosphate, 0.1 part of the leveling agent polyether-modified polysiloxane, and 0.02 part of the corrosion inhibitor benzotriazole to the solution in the vertical grinder, stir and grind and disperse at a high speed of 1300 r / min for 20 min, sieve and separate to remove the grinding medium, add 0.05 part of the viscosity regulator polyvinylpyrrolidone, and adjust the viscosity at 25 °C to 95 mPa·s to obtain a functional film-forming liquid.

[0045] S3. Use a tinplate can as a container to measure and fill the functional film-forming liquid obtained in step S2 at normal pressure, seal the valve, and fill in the propellant carbon dioxide according to the mass ratio of the functional film-forming liquid to the propellant of 100:40, with the container pressure of 0.75 MPa. After weighing detection and water bath detection, install a nozzle to obtain a high-temperature resistant aerosol for isolating the adhesion of welding slag.

[0046] Example 3

[0047] S1. Grind and modify spherical glass microspheres and zinc stearate in a ball mill at a mass ratio of 100:5 for 30 min to obtain a release agent.

[0048] S2. By weight, add 20 parts of polyketone resin and 75 parts of ethanol to a vertical grinder, stir at a low speed of 700 r / min for 20 min, and under the impact of the grinding medium, the polyketone resin is completely dissolved in ethanol to form a solution; among them, the grinding medium is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 20% of the solution volume; then, add 3 parts of the release agent, 0.3 part of the dispersant sodium hexametaphosphate, 0.1 part of the leveling agent polyether-modified polysiloxane, and 0.02 part of the corrosion inhibitor octadecylamine to the solution in the vertical grinder, stir and grind and disperse at a high speed of 1300 r / min for 20 min, sieve and separate to remove the grinding medium, add 0.09 part of the viscosity regulator triethylene glycol, and adjust the viscosity at 25 °C to 90 mPa·s to obtain a functional film-forming liquid.

[0049] S3. Using a tinplate can as the container, the functional film-forming liquid obtained in step S2 is metered and canned at atmospheric pressure, the valve is sealed, and nitrogen as the propellant is filled in according to the mass ratio of the functional film-forming liquid to the propellant of 100:30. The container pressure is 0.65 MPa. After weighing detection and water bath detection, a nozzle is installed to obtain a high-temperature resistant aerosol for isolating the adhesion of welding slag.

[0050] Comparative Example 1

[0051] S1. By weight, 18 parts of polyketone resin and 75 parts of ethanol are added to a vertical grinder and stirred at a low speed of 700 r / min for 30 min. Under the impact of the grinding medium, the polyketone resin is completely dissolved in ethanol to form a solution. Among them, the grinding medium is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 25% of the solution volume. Then, 0.2 parts of dispersant sodium pyrophosphate, 0.1 part of leveling agent polyether-modified polysiloxane, and 0.01 part of corrosion inhibitor tallow amine are added to the solution in the vertical grinder, and stirred and ground at a high speed of 1300 r / min for 15 min. The grinding medium is removed by sieving separation, and 0.11 parts of viscosity regulator triethylene glycol is added to adjust the viscosity at 25°C to 90 mPa·s to obtain the functional film-forming liquid.

[0052] S2. Using a tinplate can as the container, the functional film-forming liquid obtained in step S1 is metered and canned at atmospheric pressure, the valve is sealed, and nitrogen as the propellant is filled in according to the mass ratio of the functional film-forming liquid to the propellant of 100:40. The container pressure is 0.70 MPa. After weighing detection and water bath detection, a nozzle is installed to obtain an aerosol for isolating the adhesion of welding slag.

[0053] In this comparative example, the inorganic release agent is cancelled, and the high-temperature resistance performance of the aerosol film is reduced to a certain extent, and it is difficult to peel the film layer.

[0054] Comparative Example 2

[0055] S1. Calcium carbonate powder and calcium stearate are ground and modified in a ball mill at a mass ratio of 100:5 for 20 min to obtain a release agent.

[0056] S2. By weight, add 18 parts of polyketone resin and 75 parts of ethanol to a vertical grinder, stir at a low speed of 700 r / min for 30 min, and under the impact of the grinding medium, the polyketone resin is completely dissolved in ethanol to form a solution. Among them, the grinding medium is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 25% of the solution volume. Then, add 5 parts of release agent, 0.2 parts of dispersant sodium pyrophosphate, 0.1 part of leveling agent polyether-modified polysiloxane, and 0.01 part of corrosion inhibitor tallow amine to the solution in the vertical grinder, stir and grind dispersedly at a high speed of 1300 r / min for 15 min, sieve and separate to remove the grinding medium, add 0.07 part of viscosity regulator triethylene glycol, and adjust the viscosity at 25 °C to 90 mPa·s to obtain a functional film-forming liquid;

[0057] S3. Use a tinplate can as a container to measure and fill the functional film-forming liquid obtained in step S2 at normal pressure, seal the valve, and fill in the propellant nitrogen according to the mass ratio of the functional film-forming liquid to the propellant of 100:35. The container pressure is 0.70 MPa. After weighing detection and water bath detection, install a nozzle to obtain a high-temperature resistant aerosol for isolating the adhesion of welding slag.

[0058] In this comparative example, the spherical silica is replaced with calcium carbonate powder, and it is a bit difficult to peel the film layer after the aerosol forms a film.

[0059] Comparative Example 3

[0060] S1. By weight, add 18 parts of polyketone resin and 75 parts of ethanol to a vertical grinder, stir at a low speed of 700 r / min for 30 min, and under the impact of the grinding medium, the polyketone resin is completely dissolved in ethanol to form a solution. Among them, the grinding medium is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 25% of the solution volume. Then, add 5 parts of spherical silica, 0.2 parts of dispersant sodium pyrophosphate, 0.1 part of leveling agent polyether-modified polysiloxane, and 0.01 part of corrosion inhibitor tallow amine to the solution in the vertical grinder, stir and grind dispersedly at a high speed of 1300 r / min for 15 min, sieve and separate to remove the grinding medium, add 0.10 part of viscosity regulator triethylene glycol, and adjust the viscosity at 25 °C to 90 mPa·s to obtain a functional film-forming liquid;

[0061] S3. Use a tinplate can as a container to measure and fill the functional film-forming liquid obtained in step S2 at normal pressure, seal the valve, and fill in the propellant nitrogen according to the mass ratio of the functional film-forming liquid to the propellant of 100:35. The container pressure is 0.70 MPa. After weighing detection and water bath detection, install a nozzle to obtain a high-temperature resistant aerosol for isolating the adhesion of welding slag.

[0062] In this comparative example, the spherical silica is not ground and modified, its dispersion performance is limited, and it affects the film layer peeling effect.

[0063] Comparative Example 4

[0064] S1. Grind and modify spherical silica and calcium stearate in a ball mill at a mass ratio of 100:5 for 20 min to obtain a release agent;

[0065] S2. By weight, add 18 parts of polyketone resin and 75 parts of ethanol to a vertical grinder, stir at a low speed of 700 r / min for 30 min, and under the impact of the grinding medium, the polyketone resin is completely dissolved in ethanol to form a solution; among them, the grinding medium is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 25% of the solution volume; then, add 5 parts of the release agent, 0.2 parts of the dispersant sodium pyrophosphate, 0.1 part of the leveling agent polyether-modified polysiloxane, and 0.01 part of the corrosion inhibitor tallow amine to the solution in the vertical grinder, stir and grind and disperse at a high speed of 1300 r / min for 15 min, and separate and remove the grinding medium by sieving to obtain a functional film-forming liquid with a viscosity of 57 mPa·s at 25°C;

[0066] S3. Use a tinplate can as a container to measure and fill the functional film-forming liquid obtained in step S2 at normal pressure, seal the valve, and fill in the propellant nitrogen according to the mass ratio of the functional film-forming liquid to the propellant of 100:35, with the container pressure of 0.70 MPa. After weighing detection and water bath detection, install a nozzle to obtain a high-temperature aerosol for isolating the adhesion of welding slag.

[0067] In this comparative example, the viscosity of the functional film-forming liquid was not adjusted, resulting in a relatively low viscosity level of the functional film-forming liquid, which led to inconspicuous microbubbles in the film layer, a dense and thin film layer, and affected the peeling effect.

[0068] To explore the protection effect of the aerosol on preventing the adhesion of high-temperature welding slag after film formation on the surface of metal parts and the peeling effect of the protective film. Spray the aerosol on the surface of metal parts for verification testing. Spray the aerosol on the surface of clean metal parts, with the nozzle 15 cm away from the working surface during spraying, spray 2 times in sequence left and right, up and down, with an interval of 10 min each time; after spraying, dry naturally for 30 min; place a magnesium wire on the film layer and ignite it (the ignition temperature is about 500°C), and generate instantaneous high-temperature burning of the film layer through the rapid combustion of the magnesium wire. Determine the difficulty of peeling by hand-tearing the film layer; evaluate the high-temperature resistance of the film layer by whether the peeled film layer is burned through and whether the surface of the metal part is burned, as shown in Table 1.

[0069] Table 1:

[0070]

[0071] The above description has described the synergism and dispersion of the high-temperature resistant polyketone resin and spherical inorganic powder in the aerosol of the present invention, and the obtained film layer has good high-temperature resistant performance and easy peeling performance. The aerosol is used for isolating the adhesion of welding slag, and effectively protects the adhesion and ablation of the splashing welding slag on the surface of the welded part during welding. After the welding protection is completed, the formed film layer can be easily peeled off from the metal part, which is convenient to use.

Claims

1. A high-temperature resistant aerosol for isolating the adhesion of welding slag, characterized in that: It is composed of a functional film-forming liquid and a propellant in a mass ratio of 100:(30 - 40); wherein: The functional film-forming liquid is composed of the following raw materials in parts by weight: 15 - 20 parts of polyketone resin, 70 - 75 parts of ethanol, 3 - 5 parts of a stripping agent, 0.2 - 0.3 parts of a dispersant, 0.1 - 0.3 parts of a leveling agent, 0.01 - 0.03 parts of a corrosion inhibitor, and an appropriate amount of a viscosity regulator; the stripping agent is obtained by mechanically grinding and modifying spherical inorganic powder and stearate in a mass ratio of 100:(5 - 7); the viscosity regulator is added in an appropriate amount to adjust the viscosity of the functional film-forming liquid at 25°C to 80 - 100 mPa·s; The propellant is one of nitrogen and carbon dioxide.

2. The high-temperature resistant aerosol for isolating the adhesion of welding slag according to claim 1, characterized in that: The polyketone resin selected has a hydroxyl value of 90 - 120 mgKOH / g and a molecular weight of 1400 - 1600.

3. The high-temperature resistant aerosol for isolating the adhesion of welding slag according to claim 1, characterized in that: The spherical inorganic powder is at least one of spherical silica, spherical glass microspheres, and spherical alumina; the average particle size of the spherical inorganic powder is 1 - 10 µm.

4. The high-temperature resistant aerosol for isolating the adhesion of welding slag according to claim 1, wherein: The stearate is at least one of zinc stearate and calcium stearate.

5. The high-temperature resistant aerosol for isolating slag adhesion according to claim 1, wherein: The dispersant selected is at least one of sodium pyrophosphate and sodium hexametaphosphate.

6. The high-temperature resistant aerosol for isolating slag adhesion according to claim 1, characterized in that: The leveling agent is polyether-modified polysiloxane.

7. The high-temperature resistant aerosol for isolating the adhesion of welding slag according to claim 1, characterized in that: The corrosion inhibitor selected is at least one of tallow amine, benzotriazole, octadecylamine, and 2-mercaptobenzothiazole.

8. The high-temperature resistant aerosol for isolating the adhesion of welding slag according to claim 1, wherein: The viscosity regulator selected is at least one of triethylene glycol and polyvinylpyrrolidone.

9. The preparation method of a high-temperature resistant aerosol for isolating the adhesion of welding slag according to any one of claims 1-8, characterized in that, The specific preparation steps are as follows: S1. The spherical inorganic powder and stearate are mechanically ground and modified in a mass ratio of 100:(5 - 7) to obtain a stripping agent; S2. According to the parts by weight, 15 - 20 parts of polyketone resin and 70 - 75 parts of ethanol are added to a vertical grinder. Through low-speed stirring, the polyketone resin is completely dissolved in ethanol under the impact of the grinding medium to form a solution; then, 3 - 5 parts of the stripping agent, 0.2 - 0.3 parts of the dispersant, 0.1 - 0.3 parts of the leveling agent, and 0.01 - 0.03 parts of the corrosion inhibitor are added to the solution in the vertical grinder, and high-speed stirring and dispersion are carried out. The grinding medium is removed by sieving, and an appropriate amount of viscosity regulator is added to adjust the viscosity at 25°C to 80 - 100 mPa·s to obtain a functional film-forming liquid; S3. The functional film-forming liquid obtained in step S2 is metered and canned at normal pressure using a tinplate can as a container and sealed. The propellant is filled in according to the mass ratio of the functional film-forming liquid to the propellant of 100:(30 - 40). After weighing detection and water bath detection, a nozzle is installed to obtain a high-temperature aerosol for isolating the adhesion of welding slag.

10. The preparation method of a high-temperature resistant aerosol for isolating the adhesion of welding slag according to claim 9, characterized in that: In step S2, the rotation speed of the low-speed stirring shaft of the vertical grinder is 700 r / min; the rotation speed of the high-speed stirring shaft is 1300 r / min; the grinding medium in the vertical grinder is zirconia ceramic balls with a diameter of 0.4 - 0.6 mm, and the filling volume of the grinding medium is 20 - 30% of the solution volume.

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