Polymethyl methacrylate composition for nail production and its preparation process

Abstract

The application relates to the technical field of resin modification, and discloses a polymethyl methacrylate composition applied to nail polish production and a preparation process thereof, which comprises high-purity and high-molecular-weight polymethyl methacrylate resin as a base body, wherein the polymethyl methacrylate resin accounts for 45-88% in weight percentage; a plasticizer with dibutyl phthalate as a base body, wherein the dibutyl phthalate accounts for 12-35% in weight percentage; a crosslinking agent with dimethyl glycol methacrylate as a base body, wherein the dimethyl glycol methacrylate accounts for 1.5-11% in weight percentage; a photoinitiator with benzoin dimethyl ether as a base body, wherein the benzoin dimethyl ether accounts for 0.5-9% in weight percentage; and the percentages are based on the total weight of the polymethyl methacrylate composition applied to nail polish production.

Description

Technical Field

[0001] This invention relates to the technical field of resin modification, specifically to a polymethyl methacrylate composition for use in nail production and its preparation process. Background Technology

[0002] Polymethyl methacrylate (PMMA), commonly known as plexiglass or acrylic, is an important thermoplastic polymer material. Due to its high transparency, good chemical stability, and ease of processing and molding, it has been widely used in many fields. In the nail industry, PMMA also plays an important role, such as in the production of artificial nails and nail art decorations. However, traditional PMMA for nail art still has certain shortcomings in some aspects, such as insufficient gloss, low hardness, and poor heat resistance.

[0003] Therefore, in order to solve the technical problem of poor heat resistance of polymethyl methacrylate (PMMA), polymer components with higher heat distortion temperature are added to effectively improve the heat resistance of the product. However, polymers with high heat distortion temperature, such as PC (polycarbonate), α-methylstyrene, and N-phenylmaleimide copolymer, will seriously degrade the inherent properties of polymethyl methacrylate (PMMA), such as transparency, resulting in poor transparency of polymethyl methacrylate (PMMA) and thus affecting gloss.

[0004] Meanwhile, in the actual application of polymethyl methacrylate (PMMA) in the nail industry, nail art products currently manufactured from PMMA are usually cast using molds. This involves stirring liquid PMMA in a reactor, pouring it into the mold, and then curing it to obtain the nail art product. However, during the mechanical processing of the liquid PMMA in the reactor, temperature control is difficult, which can easily lead to incomplete polymerization. This incomplete polymerization can result in lower product strength.

[0005] Furthermore, since our company is located in Chongqing, China, and Chongqing is characterized by high humidity year-round due to its geographical location, topography, water system, and climate, polymethyl methacrylate (PMMA) liquid, due to the presence of lactone groups, easily absorbs moisture from the surrounding environment during machining. This makes it difficult for our company to accurately control the moisture content of PMMA liquid during production, resulting in products that are prone to cracking.

[0006] Meanwhile, due to its geographical location, topography, water system distribution, and climate characteristics, Chongqing not only experiences high humidity year-round but also high temperatures for most of the year. Polymethyl methacrylate (PMMA) liquid is a non-Newtonian fluid, making it more sensitive to temperature than other Newtonian fluid plastics. Therefore, the processing temperature of PMMA liquid is strictly controlled during production. However, due to Chongqing's geographical location, the ambient temperature often affects the production temperature of PMMA liquid. When the temperature is too high or too low, products made from PMMA liquid are prone to insufficient toughness, failing to meet the actual needs of nail art applications. Therefore, PMMA itself undergoes modification treatment, and the production equipment and processes for producing PMMA are optimized to enable its application in Chongqing and meet the practical needs of the nail art industry. Summary of the Invention

[0007] The present invention aims to provide a polymethyl methacrylate (PMMA) composition for use in nail production and its preparation process. The invention modifies PMMA itself and optimizes the production equipment and process for producing PMMA, enabling PMMA to be used in production in Chongqing and striving to meet the practical needs of the nail industry.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] 1) A polymethyl methacrylate composition for use in nail art production, comprising:

[0010] The matrix is ​​made of high-purity, high-molecular-weight polymethyl methacrylate resin, and the polymethyl methacrylate resin accounts for 45-88 wt% by weight.

[0011] A plasticizer based on dibutyl phthalate, wherein the dibutyl phthalate comprises 12-35 wt% by weight.

[0012] A crosslinking agent based on ethylene glycol dimethacrylate, wherein the ethylene glycol dimethacrylate comprises 1.5-11 wt% by weight;

[0013] A photoinitiator based on benzoin dimethyl ether, wherein the benzoin dimethyl ether is 0.5-9 wt% by weight; the percentage is based on the total weight of the polymethyl methacrylate composition used in nail production.

[0014] In this technical solution, high-purity, high-molecular-weight polymethyl methacrylate resin is selected as the matrix to ensure the transparency and mechanical properties of the product. The polymethyl methacrylate resin with a weight percentage of 45-88 wt% has a high degree of regularity and rigidity in its molecular chain. At the same time, the polymethyl methacrylate resin is preferentially oriented at a weight percentage of 65 wt%, so that the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether interact to form a polymethyl methacrylate composition.

[0015] During the curing process of the polymethyl methacrylate composition, the polymethyl methacrylate resin matrix reduces the shrinkage area, while dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether adhere to and adsorb onto the surface of the matrix. The ester groups of the polymethyl methacrylate resin matrix itself allow dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether to penetrate into the matrix together, thereby improving adhesion, weather resistance, durability and abrasion resistance.

[0016] Meanwhile, the plasticizer based on dibutyl phthalate, with dibutyl phthalate at a weight percentage of 12-35 wt%, preferably 25 wt%, improves the flexibility and processing performance of the polymethyl methacrylate composition. During this process, because dibutyl phthalate itself is highly volatile, adding it at a weight percentage of 25 wt% to the polymethyl methacrylate composition can promote the evaporation of moisture within the composition, reducing the impact of humidity absorbed by the polymethyl methacrylate composition on the moisture content within the composition, thereby ensuring the moisture content of the polymethyl methacrylate composition.

[0017] Secondly, a crosslinking agent based on ethylene glycol dimethacrylate (EDMA), with EDMA at a weight percentage of 1.5-11 wt%, preferably 8 wt%, can improve the hardness and heat resistance of the polymethyl methacrylate (PMMA) composition. A photoinitiator based on benzoin dimethyl ether (BME), with a weight percentage of 0.5-9 wt%, preferably 2 wt%, is used to initiate the polymerization reaction, allowing the PMMA composition to fully polymerize in the reactor and enabling the product to cure rapidly under ultraviolet light, ensuring product strength. This allows PMMA to be used in production in Chongqing, aiming to meet the practical needs of the nail industry.

[0018] 2) The polymethyl methacrylate composition for use in nail production as described in 1), wherein:

[0019] The high-purity, high-molecular-weight polymethyl methacrylate resin has a high purity of 500,000 molecular weight and a mesh size of 100; and a high molecular weight of 2 million, and is a long-chain polymer compound. This makes the molecular chains formed in the interaction with dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether very soft, thus the polymethyl methacrylate composition has high strength.

[0020] 3) A process for preparing a polymethyl methacrylate composition for use in nail production, comprising the following steps: (as described in any one of 1)-2)

[0021] Step 1: Using polymethyl methacrylate resin as the matrix, polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether are added to the reaction vessel in sequence according to the weight percentage. The reaction vessel has a spray structure for mixing and stirring polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether.

[0022] Step 2: Based on the spray structure in Step 1, nitrogen gas is sprayed into the internal space of the reactor during the rotation process, causing the air inside the reactor to be discharged. At the same time, the nitrogen gas is sprayed onto polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether, which initially causes the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether to be slowly stirred during the rotating spray gas process.

[0023] Step 3: When the nitrogen sensor in the reactor in Step 2 detects that the gas discharged from the reactor is nitrogen, the reactor is intelligently sealed. The heating temperature inside the reactor is controlled and adjusted by the ambient humidity and temperature around the reactor, and the stirring speed of the jet structure is adjusted simultaneously to ensure that the heating temperature inside the reactor meets the polymerization reaction requirements of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether, to obtain a polymethyl methacrylate composition.

[0024] Since reaction temperature is one of the important parameters of bulk polymerization, excessively high temperatures can lead to excessively fast reaction rates and explosive polymerization, while excessively low temperatures can slow down the reaction rate and affect production efficiency. Therefore, this technical solution controls the heating temperature inside the reactor by monitoring the humidity and temperature of the surrounding environment. This allows the solution to be applied in the Chongqing area. By monitoring the humidity and temperature of the surrounding environment, the heating temperature of the reactor can be adjusted to maintain a stable reaction temperature inside the reactor. This satisfies the polymerization reaction between polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether, ensuring that the polymethyl methacrylate resin, dibutyl phthalate, and benzoin dimethyl ether react fully to obtain a stable polymethyl methacrylate composition.

[0025] In this process, after polymethyl methacrylate resin, dibutyl phthalate, and dibutyl phthalate and benzoin dimethyl ether are added to the reactor, nitrogen is used to fill the reactor and air is discharged. This prevents oxidation. In addition, when a nitrogen sensor designed on the reactor detects that the gas discharged from the reactor is nitrogen, the reactor is intelligently sealed, forming a closed space. This prevents polymethyl methacrylate resin from absorbing moisture from the air during the polymerization reaction with dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether. This improves the precise temperature control of the internal space of the reactor, thereby accurately controlling the moisture content in the polymethyl methacrylate composition and reducing product cracking.

[0026] Furthermore, this technical solution employs a combination of initial stirring and uniform stirring. The reactor contains a spray structure that mixes and stirs polymethyl methacrylate (PMMA), dibutyl phthalate (DMT), and benzoin dimethyl ether. During the slow stirring process of the spray structure, rotating nitrogen gas is injected into the reactor. The nitrogen gas impacts the PMMA, DMT, and benzoin dimethyl ether, providing initial stirring and ensuring that the PMMA, DMT, and benzoin dimethyl ether are initially stirred. However, at this stage, the PMMA, DMT, and benzoin dimethyl ether have not yet fully polymerized.

[0027] When the ambient humidity and temperature around the reactor are controlled and adjusted to adjust the heating temperature inside the reactor, the stirring speed of the jet structure of the reactor is adjusted synchronously. An appropriate stirring speed can make the reactants fully mixed, improve the uniformity of the polymerization reaction, make the molecular weight distribution in the polymethyl methacrylate composition uniform, and improve the performance of the product.

[0028] 4) The preparation process of the polymethyl methacrylate composition for nail production as described in 3), wherein:

[0029] In step one, the reactor includes a tank body. The top of the tank body has an inlet for feeding polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether. The top of the tank body is hinged with a cover for sealing the inlet. The cover has an arc-shaped structure and a partition is arranged laterally on the upper part of the cover. A drive motor is installed on the cover and is fixed to the partition by bolts and nuts. The drive motor is connected to the spray structure. A gas supply pipe is provided on the cover and on one side of the drive motor, passing through the cover and extending toward the inside of the tank body.

[0030] In the above technical solution, the reactor tank serves as the space for the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether. The polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether are sequentially fed into the tank through the feed port on the tank. When the drive motor drives the spray structure to rotate, the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank are stirred at a uniform speed, so that the polymerization reaction between the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether can fully occur.

[0031] After adding polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether into the tank, the tank is sealed with a lid to prevent oxidation of these substances in the air. Simultaneously, nitrogen is injected into the tank through a gas supply pipe, forcing air to escape and preventing oxidation of the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether caused by air within the tank.

[0032] In addition, in this technical solution, both the drive motor and the air supply pipe are located on the cover. The drive motor is supported by a partition inside the cover. At the same time, the design on the cover also makes it convenient for workers to replace the drive motor and the air supply pipe, or to repair the drive motor and the air supply pipe.

[0033] 5) The preparation process of the polymethyl methacrylate composition for nail production as described in 4), wherein:

[0034] The upper space inside the gas pipeline is provided with a vertical partition plate along its axial direction. The partition plate divides the upper space of the gas pipeline into a nitrogen channel for nitrogen to pass through and an air channel for air to be discharged. The nitrogen channel and the air channel are connected to the lower space inside the gas tank. A nitrogen sensing sensor is provided in the air channel. A control valve is provided at the bottom of the lower space inside the gas pipeline. The pipeline also includes a microprocessor, which is electrically connected to the nitrogen sensing sensor and the control valve respectively.

[0035] The above technical solution improves the gas supply pipe of the original reactor by welding a vertically arranged partition plate inside the gas supply pipe. At the same time, a control valve is installed in the lower space of the gas supply pipe. The partition plate divides the upper space of the gas supply pipe into a nitrogen channel and an air channel. Nitrogen is introduced into the tank through the nitrogen channel and enters the lower space of the gas supply pipe through the nitrogen channel. Then, it enters the tank through the lower space of the gas supply pipe and forces the air in the tank to flow towards the air channel of the gas supply pipe. This allows the air in the tank to be discharged outward through the air channel, thereby avoiding the oxidation reaction between polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank.

[0036] Meanwhile, when the nitrogen sensor installed in the air channel detects that nitrogen is being discharged from the air channel, it determines that the tank is filled with sufficient nitrogen. At this time, the nitrogen sensor transmits the detection information to the microprocessor, which then sends a command to the control valve, causing the control valve to close the lower space in the gas supply pipe. This ensures that the nitrogen in the tank will not be discharged after filling, maintaining a constant amount of nitrogen in the tank, thereby improving the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether.

[0037] 6) The preparation process of the polymethyl methacrylate composition for nail production as described in 3), wherein:

[0038] In step two, the injection structure includes a hollow lead screw connected to a drive motor. The hollow lead screw has a flow channel for nitrogen flow. Several injection holes are evenly distributed along the axial direction of the hollow lead screw. A nut sleeve that moves along the axial direction is fitted on the hollow lead screw. Several moving stirring blades are evenly distributed along the circumferential direction of the nut sleeve. Several positioning stirring blades are welded to the bottom of the hollow lead screw along the circumferential direction.

[0039] In the above technical solution, a drive motor drives the hollow screw to rotate. During the rotation of the hollow screw, the gas supply box simultaneously inputs nitrogen into the nitrogen channel of the gas delivery pipe and the flow channel inside the hollow screw. The nitrogen output from the nitrogen channel of the gas delivery tank directly enters the tank body to purge the air inside the tank. The nitrogen output from the flow channel inside the hollow screw is sprayed into the tank body through the injection holes. During this process, all injection holes rotate with the rotation of the hollow screw. As the injection holes rotate, they drive the sprayed nitrogen to swirl around the hollow screw, which initially stirs the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether around the hollow screw.

[0040] During the initial stirring process via nitrogen injection, the nut sleeve fitted on the hollow screw moves along the axial direction of the hollow screw. As the nut sleeve moves along the axial direction of the hollow screw, it drives the moving stirring blades set around the nut sleeve to move up and down along its axial direction, thereby achieving moving stirring of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether from top to bottom or from bottom to top. This ensures that the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether are stirred in interchangeably from top to bottom or from bottom to top within the tank, thus enabling the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether to be mixed uniformly.

[0041] Furthermore, in this technical solution, several positioning stirring blades welded circumferentially to the bottom of the hollow screw rotate along with the hollow screw, stirring the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether located in the lower part of the tank. Combined with the moving stirring blades, these components move towards the upper part of the tank, ensuring uniform stirring in both the radial and axial directions. This prevents radial shrinkage of the polymethyl methacrylate resin, and unpolymerized monomers naturally flow down to fill any gaps, thereby improving product quality.

[0042] 7) The preparation process of the polymethyl methacrylate composition for nail production as described in 6), wherein:

[0043] The hollow screw is equipped with a rotary joint, which has a nitrogen inlet hole for feeding nitrogen into the flow channel. The rotary joint is connected to a gas supply box containing nitrogen through a pipe, and a vacuum pump is installed on the pipe.

[0044] The above technical solution is one way to introduce nitrogen into the flow channel of the hollow screw, but it is not limited to the above technical solution. In the above technical solution, nitrogen is extracted from the air supply pipe of the air pump box and introduced into the pipeline. The pipeline introduces nitrogen into the rotary joint, and the rotary joint introduces nitrogen into the flow channel through the nitrogen inlet hole. When the hollow screw rotates, due to the setting of the rotary joint, nitrogen is introduced from the air supply box of the pipeline into the rotating hollow screw, so that the flow channel in the hollow screw is filled with nitrogen, without affecting the rotation of the hollow screw.

[0045] 8) The preparation process of the polymethyl methacrylate composition for nail production as described in 3), wherein:

[0046] In step three, the reactor includes a temperature control sleeve fitted on the outer surface of the tank body. Several temperature control plates are evenly distributed along the circumferential direction inside the temperature control sleeve. The temperature control plates are vertically arranged along the axial direction of the tank body. The temperature control plates have hot oil channels for storing hot oil. Several hollow hot protrusions are evenly distributed along the axial direction on the inner side of the tank body facing the temperature control plates. Each hot protrusion is connected to the hot oil channel through a short hot oil pipe on the side away from the tank body.

[0047] A cold control plate is provided between adjacent temperature control plates. The cold control plate is arranged vertically along the axis of the tank body and has a cold water channel for storing cold water. Several hollow cold protrusions are evenly distributed on the inner side of the tank body facing the cold control plate, and each cold protrusion is connected to the cold water channel through a short cold water pipe on the side away from the tank body.

[0048] Because methyl methacrylate resin is extremely sensitive to temperature, the above technical solution uses an array of heating and cooling points to achieve temperature control of the temperature control sleeve. The detailed process is as follows: When the temperature sensor inside the tank (the temperature sensor is set on the surface of the cover facing the tank) detects that the temperature inside the tank is insufficient for the polymerization reaction of methyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether, several temperature control plates evenly distributed and spaced apart in the circumferential direction of the temperature control sleeve achieve a longitudinal arrangement of heated protrusions evenly distributed along their axial direction on each temperature control plate. At the same time, because several heated protrusions on each temperature control plate are arranged along their axial direction, all heated protrusions are arranged laterally. All the heated protrusions are located on the inner side of the tank. Therefore, all the heated protrusions on the inner side of the tank are arranged in an array. Hot oil is delivered to each heated protrusion through the hot oil channel in the temperature control plate via a short hot oil pipe. The heated protrusion is the center point for heat expansion to the periphery, forming a heat dissipation point. The array of heat dissipation points together heat the methyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank. This point-to-surface heating method ensures that the methyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether are heated evenly, thereby accurately heating the methyl methacrylate resin and avoiding overheating.

[0049] When the temperature sensor inside the tank detects that the temperature inside the tank is higher than the heating temperature for the reaction of methyl methacrylate resin, the hot oil inside the hot protrusions is quickly sucked out, ensuring that all hot protrusions are free of hot oil. Simultaneously, due to the cold control plates positioned between adjacent temperature control plates, several cold control plates are evenly distributed and spaced apart along the circumference of the temperature control sleeve, achieving a longitudinal arrangement of cold protrusions evenly distributed along their axial direction on each cold control plate. Furthermore, because several cold protrusions on each cold control plate are arranged along their axial direction, all cold protrusions are arranged laterally. Since all cold protrusions are located on the inner side of the tank, therefore, within the tank... All the cold protrusions on the inner side of the tank are arranged in an array, and hot oil is delivered to each cold protrusion through the cold water channel in the cold control plate via a short hot oil pipe. The cold protrusions are used as the center point to expand the heat outward to form cold air dissipation points. The array of cold air dissipation points together cool the methyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank. At the same time, the surface of the adjacent hot protrusions is also cooled, thereby achieving precise cooling and keeping the temperature of the methyl methacrylate resin polymerization reaction within a constant range.

[0050] 9) The preparation process of the polymethyl methacrylate composition for nail production as described in 8), wherein:

[0051] The outer surface of the tank is welded with a support plate extending outward. A hot oil tank and a cold water tank are fixed to the upper surface of the support plate by bolts and nuts. The hot oil tank and the cold water tank are arranged side by side on the upper surface of the support plate. A hot oil main pipeline is connected to the hot oil tank. A hot oil pump is installed on the hot oil main pipeline. Several hot oil branch pipelines are evenly distributed along the axis of the hot oil main pipeline. The position of each hot oil branch pipeline corresponds one-to-one with the position of the heat control plate. The hot oil branch pipeline is connected to the corresponding hot oil channel in the heat control plate.

[0052] The cold water tank is connected to a main cold water pipe, and a cold water pump is installed on the main cold water pipe. Several cold water branch pipes are evenly distributed along the axis of the main cold water pipe. The position of each cold water branch pipe corresponds one-to-one with the position of the cold control plate. The cold water branch pipes are connected to the corresponding cold water channels in the cold control plate.

[0053] Based on the above technical solution, the support plate set on the outside of the tank body is used to support the installation of the hot oil tank and the cold water tank. The hot oil tank is pumped by a hot oil pump to transport the hot oil in the hot oil tank to the hot oil main pipeline. The hot oil main pipeline transports the hot oil to the hot oil branch pipelines respectively. The position of each hot oil branch pipeline corresponds to the position of the heat control plate. The hot oil branch pipeline is connected to the hot oil channel in the corresponding heat control plate, dispersing the hot oil and transporting it to the hot oil channel in each heat control plate. This ensures that the heat-generating protrusion on the inner side of the tank generates heat to heat the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank body.

[0054] The cold water tank uses a cold water pump to transport cold water from the tank to the main cold water pipeline. The main cold water pipeline then transports cold water to the branch cold water pipelines. Each branch cold water pipeline corresponds to a specific position on the cold control plate. The branch cold water pipelines are connected to the corresponding cold water channels within the cold control plate, dispersing the cold water and transporting it to the cold water channels of each cold control plate. This ensures that the cold protrusions on the inner side of the tank generate cooling capacity, which cools the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether inside the tank, keeping the polymerization reaction within a constant temperature range.

[0055] 10) The preparation process of the polymethyl methacrylate composition for nail production as described in 4), wherein:

[0056] The bottom of the tank is provided with an arc-shaped part, and a discharge hole is opened in the middle of the arc-shaped part. A discharge pipe extending outward is installed on the discharge hole, and a valve for opening and closing the discharge port is installed inside the discharge pipe. Several support legs are evenly distributed along the circumference of the arc-shaped part, and the top of the support legs is welded to the bottom of the temperature control sleeve.

[0057] The arc-shaped section at the bottom of the tank, as described above, concentrates the polymerized materials of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether within this arc-shaped section. Once the polymerization reaction is complete, the valve on the discharge pipe is activated, allowing the polymerized materials to be discharged through the discharge pipe. Simultaneously, support legs are installed at the bottom of the temperature control sleeve, surrounding the arc-shaped section. All these support legs work together to support the reactor and maintain its stability.

[0058] Compared with the prior art, the present invention also has the following technical effects:

[0059] This invention employs a combination of initial stirring and uniform stirring. The reactor contains a spray structure for mixing and stirring polymethyl methacrylate (PMMA) resin, dibutyl phthalate (DMT), and benzoin dimethyl ether. During the slow stirring process of the spray structure, rotating nitrogen gas is injected into the reactor. The nitrogen gas impacts the PMMA resin, DMT, and benzoin dimethyl ether, providing initial stirring for these components, thus promoting the mixing of PMMA resin, DMT, and benzoin dimethyl ether. In the initial stage, polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether have been initially stirred, but at this time, the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether have not yet fully polymerized. When the ambient humidity and temperature around the reactor are controlled and adjusted to adjust the heating temperature inside the reactor, the stirring speed of the jet structure of the reactor is adjusted synchronously. An appropriate stirring speed can make the reactants fully mixed, improve the uniformity of the polymerization reaction, make the molecular weight distribution in the polymethyl methacrylate composition uniform, and improve the performance of the product. Attached Figure Description

[0060] Figure 1 This is a flowchart illustrating the preparation process of the polymethyl methacrylate composition used in nail production according to the present invention;

[0061] Figure 2 This is a schematic diagram of the preparation equipment used in the preparation process of the polymethyl methacrylate composition for nail production according to the present invention;

[0062] Figure 3 for Figure 2 Sectional view of AA;

[0063] Figure 4 for Figure 3 A cross-sectional view of BB. Detailed Implementation

[0064] The following detailed description illustrates the specific implementation method:

[0065] The reference numerals in the accompanying drawings of the instruction manual include: 1. Temperature control sleeve; 2. Cover; 3. Drive motor; 4. Gas supply pipe; 5. Hot oil tank; 6. Cold water tank; 7. Support plate; 8. Arc-shaped part; 9. Support leg; 10. Discharge pipe; 11. Valve; 12. Hollow screw; 13. Positioning stirring blade; 14. Nut sleeve; 15. Moving stirring blade; 16. Tank body; 17. Heat control plate; 18. Heat protrusion; 19. Baffle plate; 20. Nitrogen channel; 21. Air channel; 22. Control valve; 23. Nitrogen inlet; 24. Injection hole; 25. Hot oil main pipe; 26. Hot oil branch pipe; 27. Cold control plate; 28. Cold protrusion; 29. ​​Cold air radiator; 30. Hot air radiator; 31. Cold water branch pipe; 32. Cold water main pipe.

[0066] Example 1

[0067] The polymethyl methacrylate composition used in nail production in Example 1 includes:

[0068] High-purity, high-molecular-weight polymethyl methacrylate resin is used as the matrix, and the polymethyl methacrylate resin accounts for 45 wt% by weight.

[0069] Plasticizers based on dibutyl phthalate, wherein dibutyl phthalate comprises 35 wt% by weight;

[0070] A crosslinking agent based on ethylene glycol dimethacrylate, wherein ethylene glycol dimethacrylate comprises 11 wt% by weight;

[0071] A photoinitiator based on benzoin dimethyl ether, wherein the benzoin dimethyl ether content is 9 wt%;

[0072] The percentage is based on the total weight of the polymethyl methacrylate composition used in nail production.

[0073] Example 2

[0074] The polymethyl methacrylate composition used in nail production in Example 2 includes:

[0075] High-purity, high-molecular-weight polymethyl methacrylate resin is used as the matrix, and the polymethyl methacrylate resin accounts for 65 wt% by weight.

[0076] Plasticizers based on dibutyl phthalate, wherein the dibutyl phthalate content is 25 wt% by weight;

[0077] A crosslinking agent based on ethylene glycol dimethacrylate, wherein ethylene glycol dimethacrylate comprises 8 wt% by weight;

[0078] A photoinitiator based on benzoin dimethyl ether, wherein the benzoin dimethyl ether content is 2 wt%;

[0079] The percentage is based on the total weight of the polymethyl methacrylate composition used in nail production.

[0080] Example 3

[0081] The polymethyl methacrylate composition used in nail production in Example 3 includes:

[0082] High-purity, high-molecular-weight polymethyl methacrylate resin is used as the matrix, and the polymethyl methacrylate resin accounts for 88 wt% by weight.

[0083] Plasticizer based on dibutyl phthalate, with dibutyl phthalate comprising 12 wt% by weight;

[0084] A crosslinking agent based on ethylene glycol dimethacrylate, wherein ethylene glycol dimethacrylate comprises 1.5 wt% by weight;

[0085] A photoinitiator based on benzoin dimethyl ether, wherein the benzoin dimethyl ether content is 0.5 wt%.

[0086] The percentage is based on the total weight of the polymethyl methacrylate composition used in nail production.

[0087] Comparative Example 1

[0088] A polymethyl methacrylate composition comprising 100 wt% polymethyl methacrylate.

[0089] Comparative Example 2

[0090] A polymethyl methacrylate composition comprising 50 wt% polymethyl methacrylate and 50 wt% dibutyl phthalate by weight percentage.

[0091] Comparative Example 3

[0092] A polymethyl methacrylate composition comprising 50 wt% polymethyl methacrylate and 50 wt% ethylene glycol dimethacrylate.

[0093] Comparative Example 4

[0094] A polymethyl methacrylate composition comprising 50 wt% polymethyl methacrylate and 50 wt% benzoin dimethyl ether.

[0095] Comparative Example 5

[0096] A polymethyl methacrylate composition comprising, by weight percentage, 40 wt% polymethyl methacrylate, 30 wt% dibutyl phthalate, and 30 wt% ethylene glycol dimethacrylate.

[0097] Comparative Example 6

[0098] A polymethyl methacrylate composition comprising, by weight percentage, 40 wt% polymethyl methacrylate, 30 wt% dibutyl phthalate, and 30 wt% benzoin dimethyl ether.

[0099] The polymethyl methacrylate compositions used in nail production in Examples 1-3 and the polymethyl methacrylate compositions in Comparative Examples 1-6 were subjected to gloss tests, hardness tests, flexibility tests, and water resistance tests.

[0100] (1) Gloss test

[0101] The gloss of the products from Examples 1-3 and Comparative Examples 1-6 was tested using a gloss meter, as shown in Table 1.

[0102]

[0103] As shown in Table 1, the gloss of Examples 1-3 meets the mirror effect, while the gloss of Comparative Examples 1-6 does not meet the mirror effect. Therefore, the products of Examples 1-3 are superior to the products of Comparative Examples 1-6 in terms of gloss.

[0104] (2) Hardness test

[0105] The hardness of the products from Examples 1-3 and Comparative Examples 1-6 was tested using the pencil hardness test method, as shown in Table 2.

[0106]

[0107] As shown in Table 2, the hardness of Examples 1-3 reached 3H or higher, which is one grade higher than that of Comparative Examples 1-6.

[0108] (3) Flexibility test

[0109] The flexibility of the products from Examples 1-3 and Comparative Examples 1-6 was tested using a bending test, as shown in Table 3:

[0110]

[0111] As shown in Table 3, the products of Examples 1-3 are not easily broken during bending, demonstrating good flexibility, while Comparative Examples 1-6 broke under the same test.

[0112] (4) Water resistance test

[0113] The products of Examples 1-3 and Comparative Examples 1-6 were soaked in water for a certain period of time, and the surface changes were observed, as shown in Table 4:

[0114]

[0115] As shown in Table 4, after soaking in water, the products of Examples 1-3 did not exhibit blistering or peeling on the surface, indicating good water resistance. In contrast, the products of Comparative Examples 1-6 showed blistering after soaking in water.

[0116] Therefore, in summary, Examples 1-3 selected high-purity, high-molecular-weight polymethyl methacrylate resin as the matrix to ensure the transparency and mechanical properties of the product; the polymethyl methacrylate resin with a weight percentage of 45-88 wt% has a high degree of regularity and rigidity in its molecular chain. At the same time, the polymethyl methacrylate resin is preferably oriented at a weight percentage of 65 wt%, so that the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether interact to form a polymethyl methacrylate composition.

[0117] During the curing process of the polymethyl methacrylate composition, the polymethyl methacrylate resin matrix reduces the shrinkage area, while dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether adhere to and adsorb onto the surface of the matrix. The ester groups of the polymethyl methacrylate resin matrix itself allow dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether to penetrate into the matrix together, thereby improving adhesion, weather resistance, durability and abrasion resistance.

[0118] Meanwhile, the plasticizer based on dibutyl phthalate, with dibutyl phthalate at a weight percentage of 12-35 wt%, preferably 25 wt%, improves the flexibility and processing performance of the polymethyl methacrylate composition. During this process, because dibutyl phthalate itself is highly volatile, adding it at a weight percentage of 25 wt% to the polymethyl methacrylate composition can promote the evaporation of moisture within the composition, reducing the impact of humidity absorbed by the polymethyl methacrylate composition on the moisture content within the composition, thereby ensuring the moisture content of the polymethyl methacrylate composition.

[0119] Secondly, a crosslinking agent based on ethylene glycol dimethacrylate (EDMA), with EDMA at a weight percentage of 1.5-11 wt%, preferably 8 wt%, can improve the hardness and heat resistance of the polymethyl methacrylate (PMMA) composition. A photoinitiator based on benzoin dimethyl ether (BME), with a weight percentage of 0.5-9 wt%, preferably 2 wt%, is used to initiate the polymerization reaction, allowing the PMMA composition to fully polymerize in the reactor and enabling the product to cure rapidly under ultraviolet light, ensuring product strength. This allows PMMA to be used in production in Chongqing, aiming to meet the practical needs of the nail industry.

[0120] Meanwhile, the high-purity, high-molecular-weight polymethyl methacrylate resin has a molecular weight of 500,000 and a mesh size of 100; and a high molecular weight of 2 million, and has long-chain polymer compounds. This makes the molecular chains formed in the interaction with dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether very soft. Therefore, the polymethyl methacrylate composition has high strength.

[0121] See Figure 1 As shown, the preparation process of the polymethyl methacrylate composition used in nail production includes the following steps:

[0122] Step 1: Using polymethyl methacrylate resin as the matrix, polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether are added to the reaction vessel in sequence according to the weight percentage. The reaction vessel has a spray structure for mixing and stirring polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether.

[0123] Step 2: Based on the spray structure in Step 1, nitrogen gas is sprayed into the internal space of the reactor during the rotation process, causing the air inside the reactor to be discharged. At the same time, the nitrogen gas is sprayed onto polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether, which initially causes the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether to be slowly stirred during the rotating spray gas process.

[0124] Step 3: When the nitrogen sensor in the reactor in Step 2 detects that the gas discharged from the reactor is nitrogen, the reactor is intelligently sealed. The heating temperature inside the reactor is controlled and adjusted by the ambient humidity and temperature around the reactor, and the stirring speed of the jet structure is adjusted simultaneously to ensure that the heating temperature inside the reactor meets the polymerization reaction requirements of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether, to obtain a polymethyl methacrylate composition.

[0125] Since reaction temperature is one of the important parameters of bulk polymerization, excessively high temperatures can lead to excessively fast reaction rates and explosive polymerization, while excessively low temperatures can slow down the reaction rate and affect production efficiency. Therefore, in this embodiment, the heating temperature inside the reactor is controlled by the humidity and temperature of the surrounding environment. This allows this embodiment to be applied in the Chongqing area. By detecting the humidity and temperature of the surrounding environment, the heating temperature of the reactor is adjusted to maintain a stable reaction temperature inside the reactor. This satisfies the polymerization reaction between polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether, allowing the polymethyl methacrylate resin, dibutyl phthalate, and benzoin dimethyl ether to react fully, resulting in a stable polymethyl methacrylate composition.

[0126] In this process, after polymethyl methacrylate resin, dibutyl phthalate, and dibutyl phthalate and benzoin dimethyl ether are added to the reactor, nitrogen is used to fill the reactor and air is discharged. This prevents oxidation. In addition, when a nitrogen sensor designed on the reactor detects that the gas discharged from the reactor is nitrogen, the reactor is intelligently sealed, forming a closed space. This prevents polymethyl methacrylate resin from absorbing moisture from the air during the polymerization reaction with dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether. This improves the precise temperature control of the internal space of the reactor, thereby accurately controlling the moisture content in the polymethyl methacrylate composition and reducing product cracking.

[0127] Furthermore, this embodiment employs a combination of initial stirring and uniform stirring. The reactor contains a spray structure for mixing and stirring polymethyl methacrylate (PMMA) resin, dibutyl phthalate (DMT), and benzoin dimethyl ether. During the slow stirring process of the spray structure, rotating nitrogen gas is injected into the reactor. The nitrogen gas impacts the PMMA resin, DMT, and benzoin dimethyl ether, providing initial stirring. This ensures that the PMMA resin, DMT, and benzoin dimethyl ether are initially stirred, but at this stage, they have not yet fully polymerized.

[0128] When the ambient humidity and temperature around the reactor are controlled and adjusted to adjust the heating temperature inside the reactor, the stirring speed of the jet structure of the reactor is adjusted synchronously. An appropriate stirring speed can make the reactants fully mixed, improve the uniformity of the polymerization reaction, make the molecular weight distribution in the polymethyl methacrylate composition uniform, and improve the performance of the product.

[0129] In step one, see Figure 2 and Figure 3 As shown, the reactor includes a tank 16. The top of the tank 16 has an inlet for feeding polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether. The top of the tank 16 is hinged with a cover 2 for sealing the inlet. The cover 2 has an arc-shaped structure and a partition 19 is arranged horizontally on the upper part of the cover 2. A drive motor 3 is installed on the cover 2. The drive motor 3 is fixed to the partition 19 by bolts and nuts. The drive motor 3 is connected to the spray structure. A gas supply pipe 4 is provided on the cover 2 and on one side of the drive motor 3, passing through the cover 2 and extending toward the inside of the tank 16.

[0130] In the above embodiments, the reactor vessel 16 serves as the space for the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether. The polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether are sequentially fed into the reactor vessel 16 through the feed inlet. When the drive motor 3 rotates the spray structure, the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether in the reactor vessel 16 are stirred at a uniform speed, so that the polymerization reaction between the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether can fully occur.

[0131] After adding polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether into the tank 16, the tank 16 is sealed with the lid 2 to prevent the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether from undergoing an oxidation reaction in the air environment. At the same time, in this embodiment, nitrogen gas is injected into the tank 16 through the gas supply pipe 4. The nitrogen gas forces the air to be discharged outward, thereby preventing the air present in the tank 16 from causing an oxidation reaction of the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether.

[0132] In addition, in this embodiment, the drive motor 3 and the air supply pipe 4 are both located on the cover 2. The drive motor 3 is supported by the partition 19 inside the cover 2. At the same time, the design on the cover 2 also makes it convenient for staff to replace the drive motor 3 and the air supply pipe 4, or to repair the drive motor 3 and the air supply pipe 4.

[0133] An arc-shaped part 8 is provided at the bottom of the tank body 16. A discharge hole is provided in the middle of the arc-shaped part 8. A discharge pipe 10 extending outward is installed on the discharge hole. A valve 11 for opening and closing the discharge port is installed inside the discharge pipe 10. Several support legs 9 are evenly distributed along the circumferential direction of the arc-shaped part 8. The top of the support legs 9 is welded to the bottom of the temperature control sleeve 1.

[0134] In the above-mentioned technology, the arc-shaped part 8 at the bottom of the tank 16 concentrates the materials from the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether within the arc-shaped part 8. After the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether is completed, the valve 11 on the discharge pipe 10 is activated, allowing the materials produced by the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank 16 to be discharged through the discharge pipe 10. At the same time, support legs 9 are provided at the bottom of the temperature control sleeve 1, which are arranged around the arc-shaped part 8. All support legs 9 together provide support for the reactor and maintain the stability of the reactor.

[0135] Also see Figure 3 As shown, the upper space inside the gas pipe 4 is provided with a vertical partition plate 19 along its axial direction. The partition plate 19 divides the upper space of the gas pipe 4 into a nitrogen channel 20 for nitrogen to pass through and an air channel 21 for air to be discharged. The nitrogen channel 20 and the air channel 21 are connected to the lower space inside the gas tank. A nitrogen sensing sensor is provided in the air channel 21. A control valve 22 is provided at the bottom of the lower space inside the gas pipe 4. It also includes a microprocessor. The microprocessor is electrically connected to the nitrogen sensing sensor and the control valve 22 respectively.

[0136] The above embodiment improves the gas supply pipe 4 of the original reactor by welding a vertically arranged partition plate 19 inside the gas supply pipe 4. At the same time, a control valve 22 is installed in the lower space inside the gas supply pipe 4. The partition plate 19 divides the upper space inside the gas supply pipe 4 into a nitrogen channel 20 and an air channel 21. Nitrogen is introduced into the tank 16 through the nitrogen channel 20. The nitrogen enters the lower space inside the gas supply pipe 4 through the nitrogen channel 20, and then enters the tank 16 through the lower space of the gas supply pipe 4. This forces the air in the tank 16 to flow towards the air channel 21 of the gas supply pipe 4, so that the air in the tank 16 is discharged out through the air channel 21. This avoids the oxidation reaction between polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank 16.

[0137] Meanwhile, when the nitrogen sensor installed in the air channel 21 detects that nitrogen is being discharged from the air channel 21, it is determined that the tank 16 is filled with sufficient nitrogen. At this time, the nitrogen sensor transmits the detection information to the microprocessor, and the microprocessor sends a command to the control valve 22, causing the control valve 22 to close the lower space in the gas supply pipe 4. This ensures that the nitrogen in the tank 16 will not be discharged after filling, maintaining a constant amount of nitrogen in the tank 16, thereby improving the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether.

[0138] In step two, the injection structure includes a hollow lead screw 12 connected to the drive motor 3. The hollow lead screw 12 has a flow channel for nitrogen flow. Several injection holes 24 are evenly distributed along the axial direction of the hollow lead screw 12. A nut sleeve 14 that moves along the axial direction is fitted on the hollow lead screw 12. Several moving stirring blades 15 are evenly distributed along the circumferential direction of the nut sleeve 14. Several positioning stirring blades 13 are welded to the bottom of the hollow lead screw along the circumferential direction.

[0139] In the above embodiment, the drive motor 3 drives the hollow screw 12 to rotate. During the rotation of the hollow screw 12, the gas supply box simultaneously inputs nitrogen into the nitrogen channel 20 of the gas supply pipe 4 and the flow channel inside the hollow screw 12. The nitrogen output from the nitrogen channel 20 of the gas supply tank directly enters the tank body 16 to purge the air inside the tank body 16. The nitrogen output from the flow channel inside the hollow screw 12 is sprayed into the tank body 16 through the injection hole 24. During this process, all the injection holes 24 rotate with the rotation of the hollow screw 12. During the rotation of the injection holes 24, the sprayed nitrogen is driven to swirl around the hollow screw 12, which initially stirs the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether around the hollow screw 12.

[0140] During the initial stirring process via nitrogen injection, the nut sleeve 14 fitted onto the hollow screw 12 moves along the axial direction of the hollow screw 12. As the nut sleeve 14 moves along the axial direction of the hollow screw 12, it drives the moving stirring blades 15 arranged around the nut sleeve 14 to move up and down along its axial direction, thereby achieving moving stirring of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether from top to bottom or from bottom to top. This ensures that the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether are stirred in interchangeably from top to bottom or from bottom to top within the tank 16, thus allowing the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether to be uniformly mixed.

[0141] Furthermore, in this embodiment, several positioning stirring blades 13 welded circumferentially to the bottom of the hollow screw 12 rotate with the hollow screw 12, thus stirring the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether inside the tank 16 and located at the bottom of the tank 16. Combined with the moving stirring blades 15, this stirs the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether in the lower part of the tank 16. The benzoin dimethyl ether moves towards the upper part of the tank 16, which allows the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank 16 to be stirred in the radial and axial directions. This ensures that the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether are stirred evenly, prevents the radial shrinkage of the polymethyl methacrylate resin, and allows unpolymerized monomers to flow down naturally to fill any possible pores, thereby improving the quality of the product.

[0142] Meanwhile, in this embodiment, a rotary joint is provided on the hollow screw 12. The rotary joint has a nitrogen inlet hole 23 for feeding nitrogen into the flow channel. The rotary joint is connected to a gas supply box containing nitrogen through a pipe, and a vacuum pump is installed on the pipe.

[0143] The above embodiment is one way to input nitrogen into the flow channel of the hollow screw 12, but it is not limited to the above embodiment. In the above embodiment, nitrogen is extracted from the air supply pipe of the air pump box and input into the pipeline. The pipeline inputs nitrogen into the rotary joint, and the rotary joint inputs nitrogen into the flow channel through the nitrogen inlet hole 23. When the hollow screw 12 rotates, due to the setting of the rotary joint, nitrogen is input from the air supply box of the pipeline into the rotating hollow screw 12, so that the flow channel in the hollow screw 12 is filled with nitrogen, without affecting the rotation of the hollow screw 12.

[0144] In step three, see Figure 4 As shown, the reactor in this embodiment includes a temperature control sleeve 1 fitted on the outer surface of the tank body 16. Several temperature control plates are evenly distributed in the circumferential direction inside the temperature control sleeve 1. The temperature control plates are vertically arranged along the axial direction of the tank body 16. The temperature control plates have hot oil channels for storing hot oil. Several hollow hot protrusions 18 are evenly distributed along the axial direction on the inner side of the tank body 16 facing the temperature control plates. The side of each hot protrusion 18 away from the tank body 16 is connected to the hot oil channel through a hot oil short pipe.

[0145] A cold control plate 27 is provided between adjacent temperature control plates. The cold control plate 27 is arranged vertically along the axis of the tank body 16. The cold control plate 27 has a cold water channel for storing cold water. Several hollow cold protrusions 28 are evenly distributed along the axis of the inner side of the tank body 16 facing the cold control plate 27. The side of each cold protrusion 28 away from the tank body 16 is connected to the cold water channel through a short cold water pipe.

[0146] Because methyl methacrylate resin is extremely sensitive to temperature, the above embodiment uses an array of heating points and an array of cooling points to achieve temperature control of the temperature control sleeve 1. The detailed process is as follows: When the temperature sensor inside the tank 16 (the temperature sensor is set on the surface of the cover 2 facing the tank 16) detects that the temperature inside the tank 16 is insufficient for the polymerization reaction of methyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether, several temperature control plates evenly distributed and spaced apart in the circumferential direction of the temperature control sleeve 1 are used to achieve longitudinal arrangement of the heat protrusions 18 evenly distributed along their axial direction on each temperature control plate. At the same time, because several heat protrusions 18 on each temperature control plate are arranged along their axial direction, all heat protrusions 18 are arranged laterally, and all heat protrusions 18 are arranged laterally. All the heads 18 are located on the inner side of the tank body 16. Therefore, all the hot protrusions 18 on the inner side of the tank body 16 are arranged in an array. Hot oil is delivered to each hot protrusion 18 through the hot oil short pipe in the hot oil channel in the temperature control plate. The hot oil expands outward from the hot protrusion 18 as the center point to form a heat dissipation point 30. The array of heat dissipation points together heat the methyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank body 16. The point-to-surface heating method makes the methyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether uniformly heated, thereby accurately heating the methyl methacrylate resin and avoiding overheating, maintaining 180-250℃.

[0147] When the temperature sensor inside the tank 16 detects that the temperature inside the tank 16 is higher than the heating temperature for the reaction of methyl methacrylate resin, the hot oil inside the hot protrusions 18 is quickly sucked out, ensuring that all hot protrusions 18 are free of hot oil. Simultaneously, due to the cold control plates 27 arranged between adjacent temperature control plates, several cold control plates 27 are evenly distributed and spaced apart along the circumference of the temperature control sleeve 1, achieving a longitudinal arrangement of cold protrusions 28 evenly distributed along their axial direction on each cold control plate 27. Furthermore, because several cold protrusions 28 on each cold control plate 27 are arranged along their axial direction, all cold protrusions 28 are arranged laterally, and all cold protrusions 28 are located on the inner side of the tank 16. Therefore, all the cold protrusions 28 on the inner side of the tank 16 are arranged in an array, and hot oil is delivered to each cold protrusion 28 through the cold water channel in the cold control plate 27 via the hot oil short pipe. The cold protrusion 28 is the center point for expanding the heat outward to form cold air dissipation points 29. The array of cold air dissipation points 29 together cool down the methyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank 16. At the same time, the surface of the adjacent hot protrusion 18 is also cooled down, thereby achieving precise cooling and keeping the temperature of the methyl methacrylate resin polymerization reaction within a constant temperature range.

[0148] A support plate 7 extending outwards from the outer surface of the tank body 16 is welded to the outer surface of the tank body 16. A hot oil tank 5 and a cold water tank 6 are fixed to the upper surface of the support plate 7 by bolts and nuts. The hot oil tank 5 and the cold water tank 6 are arranged side by side on the upper surface of the support plate 7. A hot oil main pipe 25 is connected to the hot oil tank 5. A hot oil pump is installed on the hot oil main pipe 25. Several hot oil branch pipes 26 are evenly distributed along the axis of the hot oil main pipe 25. The position of each hot oil branch pipe 26 corresponds one-to-one with the position of the heat control plate 17. The hot oil branch pipe 26 is connected to the corresponding hot oil channel in the heat control plate 17.

[0149] The cold water tank 6 is connected to a main cold water pipe 32, and a cold water pump is installed on the main cold water pipe 32. Several cold water branch pipes 31 are evenly distributed along the axis of the main cold water pipe 32. The position of each cold water branch pipe 31 corresponds to the position of the cold control plate 27. The cold water branch pipe 31 is connected to the corresponding cold water channel in the cold control plate 27.

[0150] Based on the above embodiments, in this embodiment, the support plate 7 set outside the tank 16 is used to support the installation of the hot oil tank 5 and the cold water tank 6. The hot oil tank 5 is pumped by a hot oil pump to transport the hot oil in the hot oil tank 5 toward the hot oil main pipe 25. The hot oil main pipe 25 transports the hot oil toward the hot oil branch pipes 26 respectively. The position of each hot oil branch pipe 26 corresponds one-to-one with the position of the heat control plate 17. The hot oil branch pipe 26 is connected to the hot oil channel in the corresponding heat control plate 17, dispersing the hot oil and transporting it toward the hot oil channel in each heat control plate 17, thereby ensuring that the heat protrusion 18 on the inner side of the tank 16 generates heat to heat the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether in the tank 16.

[0151] The cold water tank 6 uses a cold water pump to transport cold water from its contents to the main cold water pipe 32. The main cold water pipe 32 then transports the cold water to the branch cold water pipes 31. Each branch cold water pipe 31 corresponds to a specific position on the cold control plate 27. The branch cold water pipes 31 are connected to the corresponding cold water channels within the cold control plate 27, dispersing the cold water and transporting it to the cold water channels of each cold control plate 27. This ensures that the cold protrusions 28 on the inner side of the tank 16 generate cooling energy, which cools the polymerization reaction of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether within the tank 16, keeping the polymerization reaction within a constant temperature range.

[0152] The reaction vessel employs a combination of initial stirring and uniform stirring. It features a jetting structure within the reactor to mix and stir polymethyl methacrylate (PMMA) resin, dibutyl phthalate (DMT), and benzoin dimethyl ether. During the slow stirring process, the jetting structure injects rotating nitrogen gas into the reactor. This nitrogen gas impacts the PMMA resin, DMT, and benzoin dimethyl ether, providing initial stirring for the mixture and ensuring uniform mixing. In the initial stage, polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether have been initially stirred, but at this time, the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate, and benzoin dimethyl ether have not yet fully polymerized. When the ambient humidity and temperature around the reactor are controlled and the heating temperature inside the reactor is adjusted, the stirring speed of the jet structure in the reactor is adjusted synchronously. An appropriate stirring speed can make the reactants fully mixed, improve the uniformity of the polymerization reaction, make the molecular weight distribution in the polymethyl methacrylate composition uniform, and improve the performance of the product.

[0153] The above are merely embodiments of this solution. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this solution. These modifications and improvements should also be considered within the scope of protection of this solution, and will not affect the effectiveness of the implementation of this solution or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A polymethyl methacrylate composition for use in nail art production, characterized in that, include: The matrix is ​​made of high-purity, high-molecular-weight polymethyl methacrylate resin, and the polymethyl methacrylate resin accounts for 45-88 wt% by weight. A plasticizer based on dibutyl phthalate, wherein the dibutyl phthalate comprises 12-35 wt% by weight. A crosslinking agent based on ethylene glycol dimethacrylate, wherein the ethylene glycol dimethacrylate comprises 1.5-11 wt% by weight; A photoinitiator based on benzoin dimethyl ether, wherein the benzoin dimethyl ether is 0.5-9 wt% by weight; the percentage is based on the total weight of the polymethyl methacrylate composition used in nail production.

2. The polymethyl methacrylate composition for use in nail production according to claim 1, characterized in that: The high-purity, high-molecular-weight polymethyl methacrylate resin has a high purity of 500,000 molecular weight and a mesh size of 100 mesh, and a high molecular weight of 2 million.

3. A preparation process for a polymethyl methacrylate composition for use in nail art production, according to any one of claims 1-2, comprising the following steps: Step 1: Using polymethyl methacrylate resin as the matrix, polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether are added to the reaction vessel in sequence according to the weight percentage. The reaction vessel has a spray structure for mixing and stirring polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether. Step 2: Based on the spray structure in Step 1, nitrogen gas is sprayed into the internal space of the reactor during the rotation process, causing the air inside the reactor to be discharged. At the same time, the nitrogen gas is sprayed onto polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether, which initially causes the polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether to be slowly stirred during the rotating spray gas process. Step 3: When the nitrogen sensor in the reactor in Step 2 detects that the gas discharged from the reactor is nitrogen, the reactor is intelligently sealed. The heating temperature inside the reactor is controlled and adjusted by the ambient humidity and temperature around the reactor, and the stirring speed of the jet structure is adjusted simultaneously to ensure that the heating temperature inside the reactor meets the polymerization reaction requirements of polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether, to obtain a polymethyl methacrylate composition.

4. The preparation process of the polymethyl methacrylate composition for nail production according to claim 3, characterized in that: In step one, the reactor includes a tank body. The top of the tank body has an inlet for feeding polymethyl methacrylate resin, dibutyl phthalate, dibutyl phthalate and benzoin dimethyl ether. The top of the tank body is hinged with a cover for sealing the inlet. The cover has an arc-shaped structure and a partition is arranged laterally on the upper part of the cover. A drive motor is installed on the cover and is fixed to the partition by bolts and nuts. The drive motor is connected to the spray structure. A gas supply pipe is provided on the cover and on one side of the drive motor, passing through the cover and extending toward the inside of the tank body.

5. The preparation process of the polymethyl methacrylate composition for nail production according to claim 4, characterized in that: The upper space inside the gas pipeline is provided with a vertical partition plate along its axial direction. The partition plate divides the upper space of the gas pipeline into a nitrogen channel for nitrogen to pass through and an air channel for air to be discharged. The nitrogen channel and the air channel are connected to the lower space inside the gas tank. A nitrogen sensing sensor is provided in the air channel. A control valve is provided at the bottom of the lower space inside the gas pipeline. The pipeline also includes a microprocessor, which is electrically connected to the nitrogen sensing sensor and the control valve respectively.

6. The preparation process of the polymethyl methacrylate composition for nail production according to claim 3, characterized in that: In step two, the injection structure includes a hollow lead screw connected to a drive motor. The hollow lead screw has a flow channel for nitrogen flow. Several injection holes are evenly distributed along the axial direction of the hollow lead screw. A nut sleeve that moves along the axial direction is fitted on the hollow lead screw. Several moving stirring blades are evenly distributed along the circumferential direction of the nut sleeve. Several positioning stirring blades are welded to the bottom of the hollow lead screw along the circumferential direction.

7. The preparation process of the polymethyl methacrylate composition for nail production according to claim 6, characterized in that: The hollow screw is equipped with a rotary joint, which has a nitrogen inlet hole for feeding nitrogen into the flow channel. The rotary joint is connected to a gas supply box containing nitrogen through a pipe, and a vacuum pump is installed on the pipe.

8. The preparation process of the polymethyl methacrylate composition for nail production according to claim 3, characterized in that: In step three, the reactor includes a temperature control sleeve fitted on the outer surface of the tank body. Several temperature control plates are evenly distributed along the circumferential direction inside the temperature control sleeve. The temperature control plates are vertically arranged along the axial direction of the tank body. The temperature control plates have hot oil channels for storing hot oil. Several hollow hot protrusions are evenly distributed along the axial direction on the inner side of the tank body facing the temperature control plates. Each hot protrusion is connected to the hot oil channel through a short hot oil pipe on the side away from the tank body. A cold control plate is provided between adjacent temperature control plates. The cold control plate is arranged vertically along the axis of the tank body and has a cold water channel for storing cold water. Several hollow cold protrusions are evenly distributed on the inner side of the tank body facing the cold control plate, and each cold protrusion is connected to the cold water channel through a short cold water pipe on the side away from the tank body.

9. The preparation process of the polymethyl methacrylate composition for nail production according to claim 8, characterized in that: The outer surface of the tank is welded with a support plate extending outward. A hot oil tank and a cold water tank are fixed to the upper surface of the support plate by bolts and nuts. The hot oil tank and the cold water tank are arranged side by side on the upper surface of the support plate. A hot oil main pipeline is connected to the hot oil tank. A hot oil pump is installed on the hot oil main pipeline. Several hot oil branch pipelines are evenly distributed along the axis of the hot oil main pipeline. The position of each hot oil branch pipeline corresponds one-to-one with the position of the heat control plate. The hot oil branch pipeline is connected to the corresponding hot oil channel in the heat control plate. The cold water tank is connected to a main cold water pipe, and a cold water pump is installed on the main cold water pipe. Several cold water branch pipes are evenly distributed along the axis of the main cold water pipe. The position of each cold water branch pipe corresponds one-to-one with the position of the cold control plate. The cold water branch pipes are connected to the corresponding cold water channels in the cold control plate.

10. The preparation process of the polymethyl methacrylate composition for nail production according to claim 4, characterized in that: The bottom of the tank is provided with an arc-shaped part, and a discharge hole is opened in the middle of the arc-shaped part. A discharge pipe extending outward is installed on the discharge hole, and a valve for opening and closing the discharge port is installed inside the discharge pipe. Several support legs are evenly distributed along the circumference of the arc-shaped part, and the top of the support legs is welded to the bottom of the temperature control sleeve.

Images