A preparation process for quick-drying perchloroethylene paint layer
By mixing modified nano-silica with expanded perlite powder to prepare fillers, and using diluents and ultrasonic spraying technology, a perchloroethylene paint layer that dries quickly and has strong adhesion is prepared. This solves the problems of slow drying and poor adhesion of traditional perchloroethylene paint layers, and improves the durability and bonding strength of the paint layer.
Patent Information
- Application Number
- CN202411730477.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2044-11-29
AI Technical Summary
Traditional perchlorethylene paint layers dry slowly, affecting product life and safety, and have poor adhesion.
The filler was prepared by mixing modified nano-silica with expanded perlite powder to enhance the compatibility and interfacial interaction between the coating and the substrate. A diluent was added to increase the solvent evaporation rate, and an ultrasonic spraying process was used to prepare a quick-drying perchlorethylene paint layer.
The rapid drying and good adhesion of the perchloroethylene paint layer are achieved, the durability and adhesion of the paint layer are improved, and the problems of long drying time and poor adhesion of traditional perchloroethylene paint layers are solved.
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Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of perchloroethylene paint layer preparation, and relates to a preparation process of a quick-drying perchloroethylene paint layer. Background Art
[0002] Perchloroethylene paint has many advantages, such as quick drying, good atmospheric stability, excellent chemical stability, strong fire resistance, convenient construction and comprehensive protection performance. These advantages make perchloroethylene paint widely used in many fields.
[0003] Perchloroethylene paint has the characteristic of retaining solvents, which means that although the paint film dries quickly on the surface, it dries slowly completely. Before the retained solvent evaporates, the paint film becomes soft and has poor adhesion. The film-forming substances in perchloroethylene paint have a tendency to retain solvents, which further slows the rate of solvent evaporation. Compared with film-forming substances with good release properties, it is more difficult to evaporate the solvent from peroxide paint.
[0004] The traditional perchloroethylene paint used for heat shields dries slowly and takes more than a week to cure. The non-drying property of the paint on the heat shield surface directly affects the service life and safety of the product. The non-drying paint not only leads to poor appearance, but also causes problems such as coating peeling and performance degradation.
[0005] Therefore need to develop a kind of preparation process of quick-drying perchlorethylene paint layer. Summary of the Invention
[0006] The object of the present invention is to provide a preparation process for a quick-drying perchloroethylene paint layer, by which the time required for the perchloroethylene paint layer to completely dry can be greatly reduced, and the prepared quick-drying perchloroethylene paint layer has good adhesion to the substrate and good durability.
[0007] The purpose of the present invention can be achieved through the following technical solutions:
[0008] A process for preparing a quick-drying perchloroethylene paint layer comprises the following steps:
[0009] S1. Preparation of perchloroethylene paint:
[0010] In parts by weight, at 35-45° C., add 0.2-0.4 parts of dispersant, 1-2 parts of plasticizer, 10-15 parts of solvent and 7-10 parts of filler into a mixing tank, stir at a speed of 300-500 r / min for 25-35 minutes, add 50-65 parts of perchloroethylene resin and 0.5-1.5 parts of leveling agent while maintaining the speed, and continue stirring for 1-3 hours to obtain a perchloroethylene paint;
[0011] S2. Preparation of perchloroethylene paint materials:
[0012] The perchloroethylene paint and the diluent are mixed in a mass ratio of 1:3 to prepare a perchloroethylene paint stock;
[0013] S3, preparing perchlorethylene paint layer:
[0014] The perchloroethylene prepared material is sprayed on a heat shield substrate through an ultrasonic spraying process and dried at room temperature for 2 to 3 days to obtain a perchloroethylene paint layer, wherein the parameters of the ultrasonic spraying are: a liquid feed rate of 10 to 50 mL / min, a working feed rate of 200 to 800 mm / min, and a power of the ultrasonic nozzle of 3 to 7 W.
[0015] As a preferred technical solution of the present invention, in step S1, the preparation process of the filler is as follows:
[0016] The sodium sucrose octasulfate was uniformly mixed with pure water, and ultrasonically dispersed at a frequency of 45-55 kHz for 0.5-1 hour to obtain a dispersion with a mass fraction of 10-15%. The dispersion was stirred with nano-silica at a speed of 300-500 r / min for 30 minutes, and then stirred at a temperature of 75-85°C for 1-2 hours. The mixture was then placed in a vacuum drying oven and dried at a temperature of 80-95°C for 15-19 hours to obtain pretreated nano-silica.
[0017] The pretreated nano-silica and chitosan dispersion with a mass of 5-10% of the pretreated nano-silica were ball-milled at a speed of 500-700 r / min for 1-3 hours. After the ball-milling, the mixture was washed with water and dried at 105°C for 8 hours to obtain modified nano-silica.
[0018] The expanded pearlite powder is treated by low-temperature plasma technology for 1 to 2 hours, wherein the low-temperature plasma action voltage is 10 to 25 kV and the low-temperature plasma action atmosphere is air mixed with 2 to 8% ammonia to obtain pretreated expanded pearlite powder;
[0019] The filler was obtained by ball-milling modified nano-silica and pretreated expanded pearlite powder in a mass ratio of 1:1 and then passing the mixture through a 200-mesh sieve.
[0020] As a preferred technical solution of the present invention, in step S1, the dispersant is one of polyvinyl pyrrolidone and sodium polymethacrylate.
[0021] As a preferred technical solution of the present invention, in step S1, the plasticizer is triisooctyl phosphite.
[0022] As a preferred technical solution of the present invention, in step S1, the solvent is one or more of acetone, sec-butyl acetate and butyl acetate.
[0023] As a preferred technical solution of the present invention, in step S1, the leveling agent is one of BYK346, BYK348 and BYK370.
[0024] As a preferred technical solution of the present invention, in step S2, the diluent is perchloroethylene diluent.
[0025] As a preferred technical solution of the present invention, the chitosan dispersion is a chitosan solution with a mass fraction of 10-15%, and the solvent in the chitosan solution is an acetic acid solution with a volume concentration of 2-3%.
[0026] As a preferred technical solution of the present invention, the solid-liquid ratio of the nano-silicon dioxide to the dispersion liquid is 1-3:20 g / mL.
[0027] As a preferred technical solution of the present invention, the rotation speed of the ball mill during the ball milling is 500 r / min and the time is 3 hours.
[0028] Sodium sucrose octasulfate is a negatively charged compound. The sulfate groups in its molecules can interact with the hydroxyl groups on the surface of nano-silica, thereby making the surface of nano-silica negatively charged. This change in charge helps to disperse and stabilize the nano-silica when mixed with subsequent chitosan, preventing it from agglomerating and precipitating, thereby optimizing the adhesion of the system.
[0029] In the present invention, pretreated nanosilica is modified using a chitosan dispersion as a ball milling agent. The surface of the pretreated nanosilica is moistened with the chitosan dispersion. Chitosan is a natural polymer compound with excellent biocompatibility and degradability, while nanosilica exhibits properties such as small size effect and surface interface effect. The chitosan and pretreated nanosilica are mixed by ball milling. As an organic polymer, the flexibility of chitosan's molecular chain and the diversity of its functional groups make it more compatible with the perchloroethylene lacquer matrix, thereby enhancing the compatibility between the nanosilica and the organic matrix. Furthermore, chitosan can be adsorbed or coated on the surface of the nanosilica, reducing its surface energy, thereby improving its dispersibility and stability.
[0030] The expanded perlite powder is surface treated by plasma to increase the active points and polar groups on its surface, improve the interaction between the expanded perlite powder and the paint, and thus enhance the compatibility and adhesion.
[0031] The filler is prepared by ball-milling modified nanosilica with pretreated expanded perlite powder. Expanded perlite powder itself has numerous closed micropores, which effectively reduce gas convection, thereby imparting excellent thermal insulation properties. Due to the porous structure of expanded perlite, its surface possesses numerous adsorption sites. Furthermore, the modified nanosilica particles adhere to the surface of the pretreated expanded perlite powder, which has increased active sites, through physical adsorption. This helps enhance interfacial compatibility, improve the overall stability and dispersibility of the filler, and thus improve paint adhesion.
[0032] After the filler is mixed with perchloroethylene, the filler's tiny particle size and large specific surface area enable it to adhere tightly to the surface of the coating substrate, thereby improving the adhesion of the coating; and the filler surface can further enhance the interfacial interaction between the filler and the perchloroethylene coating substrate through intermolecular forces with the chlorine atoms in the perchloroethylene molecules, thereby improving the adhesion and overall performance of the coating. This interaction can further enhance the bonding force between the coating and the substrate, allowing the coating to adhere more firmly to the surface of the heat shield substrate, thereby improving the durability of the paint layer.
[0033] Expanded perlite has a porous structure and a low bulk density, which is beneficial to improving the adsorption performance of the paint, promoting the volatilization of the solvent in the paint, making the surface drying and actual drying of the paint consistent, and helping to increase the drying rate of the perchlorethylene coating.
[0034] Before spraying perchloroethylene paint, add diluent to mix it. By increasing the solvent content in the perchloroethylene paint to reduce the solute concentration, the solvent in the paint layer can be evaporated and dried quickly, making the paint layer hard in a short time.
[0035] Beneficial effects of the present invention:
[0036] The present invention prepares a quick-drying perchloroethylene paint layer. The filler obtained by mixing modified nano-silica and expanded perlite is used to improve the compatibility and interface interaction between the filler and the coating, thereby enhancing the bonding force between the paint layer and the heat shield substrate and improving the durability of the paint layer. By mixing with a diluent, the problem that traditional perchloroethylene paint layers are difficult to dry quickly and completely in a short time is solved. DETAILED DESCRIPTION
[0037] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.
[0038] In the comparative examples and embodiments of the present invention:
[0039] Perchloroethylene diluent: Eye brand, brand number X-3;
[0040] Perchlorethylene resin: purchased from Hubei Chengfeng Chemical Co., Ltd.
[0041] Nano-silicon dioxide: purchased from Hubei Fangde New Materials Co., Ltd.
[0042] Chitosan: purchased from Shanghai Yien Chemical Technology Co., Ltd.
[0043] Sucrose octasulfate sodium: purchased from Hubei Yongkuo Technology Co., Ltd., product number: YK0279;
[0044] Polyvinylpyrrolidone: purchased from Hefei Hongrui Biotechnology Co., Ltd.
[0045] Tri(2-ethylhexyl)phosphite: purchased from Hubei Xinhongli Chemical Co., Ltd., product number: XHL6300.
[0046] BYK346: purchased from Dongguan Ruikun Material Technology Co., Ltd.
[0047] Example 1
[0048] S1. Preparation of perchloroethylene paint:
[0049] Preparation of filler:
[0050] Sodium sucrose octasulfate was uniformly mixed with pure water, and ultrasonically dispersed at a frequency of 45 kHz for 0.5 h to obtain a dispersion with a mass fraction of 10%. The dispersion and nano-silica were stirred at a speed of 300 r / min for 30 min, and then stirred at a temperature of 75°C for 1 h. The mixture was then placed in a vacuum drying oven and dried at a temperature of 80°C for 15 h to obtain pretreated nano-silica, wherein the solid-liquid ratio of nano-silica to the dispersion was 1:20 g / mL;
[0051] The pretreated nano-silica was mixed with a chitosan dispersion having a mass fraction of 5% of the pretreated nano-silica, and the mixture was ball-milled at a speed of 500 r / min for 1 hour. After the ball-milling, the mixture was washed with water and dried at 105°C for 8 hours to obtain modified nano-silica, wherein the chitosan dispersion was a chitosan solution having a mass fraction of 10%, and the solvent in the chitosan solution was an acetic acid solution having a volume concentration of 2%;
[0052] The expanded pearlite powder was treated by low-temperature plasma technology for 1 hour, wherein the low-temperature plasma action voltage was 10 kV and the low-temperature plasma action atmosphere was air mixed with 2% ammonia to obtain pretreated expanded pearlite powder;
[0053] The modified nano-silica and pre-treated expanded pearlite powder in a mass ratio of 1:1 were ball milled at a speed of 500 r / min for 3 hours and then passed through a 200 mesh sieve to obtain the filler;
[0054] In parts by weight, at 35° C., 0.2 parts of polyvinyl pyrrolidone, 1 part of triisooctyl phosphite, 10 parts of acetone and 7 parts of filler were added to a mixing tank and stirred at a speed of 300 r / min for 25 minutes. While maintaining the speed, 50 parts of perchloroethylene resin and 0.5 parts of BYK346 were added and stirred for 1 hour to obtain a perchloroethylene paint.
[0055] S2. Preparation of perchloroethylene paint materials:
[0056] The perchloroethylene paint and the perchloroethylene diluent are mixed in a mass ratio of 1:3 to prepare a perchloroethylene paint stock;
[0057] S3, preparing perchlorethylene paint layer:
[0058] The perchloroethylene prepared material is sprayed on the heat shield substrate through an ultrasonic spraying process and dried at room temperature for 2 days to obtain a perchloroethylene paint layer, wherein the ultrasonic spraying parameters are: liquid feed rate of 10 mL / min, working feed speed of 200 mm / min, and ultrasonic nozzle power of 3 W.
[0059] Example 2
[0060] S1. Preparation of perchloroethylene paint:
[0061] Preparation of filler:
[0062] Sodium sucrose octasulfate was uniformly mixed with pure water, and ultrasonically dispersed at a frequency of 50 kHz for 0.8 h to obtain a dispersion with a mass fraction of 12%. The dispersion and nano-silica were stirred at a speed of 400 r / min for 30 min, and then stirred at a temperature of 80°C for 1.5 h. The mixture was then placed in a vacuum drying oven and dried at a temperature of 87°C for 17 h to obtain pretreated nano-silica, wherein the solid-liquid ratio of nano-silica to the dispersion was 2:20 g / mL;
[0063] The pretreated nano-silica was mixed with a chitosan dispersion containing 7% of the pretreated nano-silica by mass, and the mixture was ball-milled at a speed of 600 r / min for 2 h. After the ball milling, the mixture was washed with water and dried at 105°C for 8 h to obtain the modified nano-silica. The chitosan dispersion was a chitosan solution with a mass fraction of 13%, and the solvent in the chitosan solution was an acetic acid solution with a volume concentration of 2.5%.
[0064] The expanded pearlite powder was treated by low-temperature plasma technology for 1.5 hours, wherein the low-temperature plasma action voltage was 18 kV and the low-temperature plasma action atmosphere was air mixed with 5% ammonia to obtain pretreated expanded pearlite powder;
[0065] The modified nano-silica and pre-treated expanded perlite in a mass ratio of 1:1 were ball-milled at a speed of 500 r / min for 3 h and then passed through a 200-mesh sieve to obtain the filler;
[0066] In parts by weight, at 40° C., 0.3 parts of polyvinyl pyrrolidone, 1.5 parts of triisooctyl phosphite, 13 parts of acetone, and 8 parts of filler were added to a mixing tank and stirred at a speed of 400 r / min for 30 minutes. 57 parts of perchloroethylene resin and 1 part of BYK346 were added while maintaining the speed and stirring was continued for 2 hours to obtain a perchloroethylene paint.
[0067] S2. Preparation of perchloroethylene paint materials:
[0068] The perchloroethylene paint and the perchloroethylene diluent are mixed in a mass ratio of 1:3 to prepare a perchloroethylene paint stock;
[0069] S3, preparing perchlorethylene paint layer:
[0070] The perchloroethylene prepared material is sprayed on the heat shield substrate through an ultrasonic spraying process and dried at room temperature for 2 days to obtain a perchloroethylene paint layer, wherein the ultrasonic spraying parameters are: liquid feed rate of 20 mL / min, working feed speed of 500 mm / min, and ultrasonic nozzle power of 4 W.
[0071] Example 3
[0072] S1. Preparation of perchloroethylene paint:
[0073] Preparation of filler:
[0074] Sodium sucrose octasulfate was uniformly mixed with pure water, and ultrasonically dispersed at a frequency of 55 kHz for 1 hour to obtain a dispersion with a mass fraction of 15%. The dispersion and nano-silica were stirred at a speed of 500 r / min for 30 minutes, and then stirred at a temperature of 85°C for 2 hours. The mixture was then placed in a vacuum drying oven and dried at a temperature of 95°C for 19 hours to obtain pretreated nano-silica, wherein the solid-liquid ratio of nano-silica to the dispersion was 3:20 g / mL;
[0075] The pretreated nano-silica and a chitosan dispersion with a mass fraction of 10% of the pretreated nano-silica were ball milled at a speed of 700 r / min for 3 hours. After the ball milling, the mixture was washed with water and dried at 105°C for 8 hours to obtain modified nano-silica. The chitosan dispersion was a chitosan solution with a mass fraction of 15%, and the solvent in the chitosan solution was an acetic acid solution with a volume concentration of 3%.
[0076] The expanded pearlite powder was treated by low-temperature plasma technology for 2 hours, wherein the low-temperature plasma action voltage was 25 kV and the low-temperature plasma action atmosphere was air mixed with 8% ammonia to obtain pretreated expanded pearlite powder;
[0077] The modified nano-silica and pre-treated expanded perlite in a mass ratio of 1:1 were ball-milled at a speed of 500 r / min for 3 h and then passed through a 200-mesh sieve to obtain the filler;
[0078] In parts by weight, at 45° C., 0.4 parts of polyvinyl pyrrolidone, 2 parts of triisooctyl phosphite, 15 parts of acetone and 10 parts of filler were added to a mixing tank and stirred at a speed of 500 r / min for 35 minutes. While maintaining the speed, 65 parts of perchloroethylene resin and 1.5 parts of BYK346 were added and stirred for 3 hours to obtain a perchloroethylene paint.
[0079] S2. Preparation of perchloroethylene paint materials:
[0080] The perchloroethylene paint and the perchloroethylene diluent are mixed in a mass ratio of 1:3 to prepare a perchloroethylene paint stock;
[0081] S3, preparing perchlorethylene paint layer:
[0082] The perchloroethylene prepared material is sprayed on the heat shield substrate through an ultrasonic spraying process and dried at room temperature for 3 days to obtain a perchloroethylene paint layer, wherein the ultrasonic spraying parameters are: liquid feed rate of 50 mL / min, working feed speed of 800 mm / min, and ultrasonic nozzle power of 7 W.
[0083] Comparative Example 1
[0084] The difference between Comparative Example 1 and Example 1 is that the nano-silica in Comparative Example 1 is not subjected to any modification treatment, and the other operations are the same.
[0085] Comparative Example 2
[0086] The difference between Comparative Example 2 and Example 1 is that nano-silicon dioxide is not added in Comparative Example 2, and the other operations are the same.
[0087] Comparative Example 3
[0088] The difference between Comparative Example 3 and Example 1 is that no diluent is added when preparing the perchloroethylene paint layer in Comparative Example 3, and the other operations are the same.
[0089] Performance testing:
[0090] 1. Adhesion test: Adhesion was tested according to GB / T5210-2006 coating adhesion test method (pull-off method). The results are shown in Table 1:
[0091] Table 1
[0092]
[0093] 2. Drying time: Tested according to GB / T1728-1979 standard. The results are shown in Table 2 below:
[0094] Table 2
[0095]
[0096] According to the above data, the perchloroethylene paint layer prepared by the present invention has a fast drying speed and strong adhesion.
[0097] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A process for preparing a quick-drying perchloroethylene paint layer, characterized in that: The following steps are involved: S1. Preparation of perchloroethylene paint: In parts by weight, at 35-45° C., add 0.2-0.4 parts of dispersant, 1-2 parts of plasticizer, 10-15 parts of solvent and 7-10 parts of filler into a mixing tank, stir at a speed of 300-500 r / min for 25-35 minutes, add 50-65 parts of perchloroethylene resin and 0.5-1.5 parts of leveling agent while maintaining the speed, and continue stirring for 1-3 hours to obtain a perchloroethylene paint; The preparation process of the filler is as follows: The sodium sucrose octasulfate was uniformly mixed with pure water, and ultrasonically dispersed at a frequency of 45-55 kHz for 0.5-1 hour to obtain a dispersion with a mass fraction of 10-15%. The dispersion was stirred with nano-silica at a speed of 300-500 r / min for 30 minutes, and then stirred at a temperature of 75-85°C for 1-2 hours. The mixture was then placed in a vacuum drying oven and dried at a temperature of 80-95°C for 15-19 hours to obtain pretreated nano-silica. The pretreated nano-silica and chitosan dispersion with a mass of 5-10% of the pretreated nano-silica were ball-milled at a speed of 500-700 r / min for 1-3 hours. After the ball-milling, the mixture was washed with water and dried at 105°C for 8 hours to obtain modified nano-silica. The expanded pearlite powder is treated by low-temperature plasma technology for 1 to 2 hours, wherein the low-temperature plasma action voltage is 10 to 25 kV and the low-temperature plasma action atmosphere is air mixed with 2 to 8% ammonia to obtain pretreated expanded pearlite powder; The filler is obtained by ball-milling modified nano-silica and pre-treated expanded pearlite powder in a mass ratio of 1:1 and then passing through a 200-mesh sieve; S2. Preparation of perchloroethylene paint materials: The perchloroethylene paint and the diluent are mixed in a mass ratio of 1:3 to prepare a perchloroethylene paint stock; S3, preparing perchlorethylene paint layer: The perchloroethylene prepared material is sprayed on a heat shield substrate through an ultrasonic spraying process and dried at room temperature for 2 to 3 days to obtain a perchloroethylene paint layer, wherein the parameters of the ultrasonic spraying are: a liquid feed rate of 10 to 50 mL / min, a working feed rate of 200 to 800 mm / min, and a power of the ultrasonic nozzle of 3 to 7 W.
2. The process for preparing the quick-drying perchloroethylene paint layer according to claim 1, wherein: In step S1, the dispersant is one of polyvinyl pyrrolidone and sodium polymethacrylate.
3. The process for preparing the quick-drying perchloroethylene paint layer according to claim 1, wherein: In step S1, the plasticizer is triisooctyl phosphite.
4. The process for preparing the quick-drying perchloroethylene paint layer according to claim 1, wherein: In step S1, the solvent is one or more of acetone, sec-butyl acetate and butyl acetate.
5. The process for preparing the quick-drying perchloroethylene paint layer according to claim 1, wherein: In step S1, the leveling agent is one of BYK346, BYK348 and BYK370.
6. The process for preparing the quick-drying perchloroethylene paint layer according to claim 1, wherein: In step S2, the diluent is perchloroethylene diluent.
7. The process for preparing a quick-drying perchloroethylene paint layer according to claim 1, wherein: The chitosan dispersion is a chitosan solution with a mass fraction of 10-15%, and the solvent in the chitosan solution is an acetic acid solution with a volume concentration of 2-3%.
8. The process for preparing a quick-drying perchloroethylene paint layer according to claim 1, wherein: The solid-liquid ratio of the nano-silicon dioxide to the dispersion is 1-3:20 g / mL.
9. The process for preparing a quick-drying perchloroethylene paint layer according to claim 1, wherein: The ball mill rotates at a speed of 500 r / min for 3 h.
Citation Information
Patent Citations
Method for preparing vinyl-perchloride fireproof coating by adopting amine-loaded perlite as flame-retarding agent
CN108342133A