Preparation method of acrylate low-resistance wear-resistant organic silicon finishing agent

Abstract

The invention discloses a preparation method of an acrylate low-resistance wear-resistant organic silicon finishing agent. The preparation method comprises the following steps: (1) synthesizing a prepolymer; (2) hydrophilic / hydrophilic antibacterial modification: sequentially adding a modified monomer and a catalyst into the reaction system in the step (1), continuously reacting for 2-4 hours at 70-90 DEG C to graft the modified monomer onto a prepolymer molecular chain, and cooling to room temperature after the reaction is finished; (3) post-treatment; the low-resistance wear-resistant organic silicon finishing agent prepared by the preparation method disclosed by the invention is applied to a functional film, the functional film is endowed with a smooth function, the frictional resistance is reduced, the waterproof and moisture permeable effects of the functional film are not hindered, body surface moisture can be discharged in time, meanwhile, the lasting antibacterial effect is increased, and the functionality of a composite fabric is improved.

Description

Technical Field

[0001] The invention belongs to the field of textile auxiliaries, and specifically relates to a method for preparing an acrylic low-resistance and wear-resistant organic silicon finishing agent. Background Art

[0002] Clothing, as an essential component of daily life, is no longer limited to covering up, but people are more concerned about its aesthetics, comfort and functionality. Outdoor clothing, as the middle layer between the human body and the environment, mainly plays the role of warmth, heat insulation, moisture permeability and breathability. Waterproof and breathable properties and wear resistance are one of the basic properties of outdoor clothing fabrics, while moisture resistance is an important indicator for testing the comfort of outdoor clothing. In the study, it was found that the clothing itself (clothing structure, style, thickness, fabric structure) and process design have an important impact on the above properties.

[0003] Waterproof and breathable functions are increasingly used in outdoor clothing. They improve the waterproof and breathable performance of fabrics, while resisting the damage of the external environment, and increasing the comfort of consumers. Lightweight waterproof and breathable outdoor clothing fabrics generally use composite technology to bond the functional face fabric with the waterproof and breathable functional membrane, thereby giving the fabric waterproof and breathable properties. The waterproof and breathable functional membrane uses a printed membrane to meet the functional and aesthetic requirements. At the same time, printed patterns will be selected on the surface close to the skin to increase the texture and beauty, and meet the needs of outdoor clothing that integrates functionality, aesthetics and wearability. It has been found through testing that after the clothing fabric and the functional membrane are hot-melt bonded, the water pressure resistance data in the wear resistance test is low, and the moisture resistance is high.

[0004] In order to overcome the above problems, it is necessary to improve the fabric preparation process, optimize the post-finishing method from the perspective of not adding equipment and being simple and convenient to operate, and use the surface tissue structure construction technology to make the above indicators meet the standards without causing other additional problems. Therefore, the focus is on preparing a suitable surface finishing agent.

[0005] Invention patent CN114905821B provides a method for preparing a PE isolation film with an anti-sticking function, that is, a slippery layer and a skeleton layer prepared from oil-based palmitamide are extruded as a whole through a three-layer co-extrusion device; CN105985576A and CN104262939A both provide a slippery masterbatch for a film, after the components are evenly mixed with a high-speed mixer, granulated using a twin-screw extruder to obtain a slippery anti-sticking masterbatch for the film, all of which require the purchase of granulation and film-making machines, which increases the equipment cost.

[0006] The paper "Preparation and Properties of Transparent, Wear-resistant and Hydrophobic Organosilicon-modified Acrylic Resins" uses the free radical polymerization method. Three acrylic monomers, methyl methacrylate (MMA), 2-hydroxyethyl methacrylate (HEMA), and butyl acrylate (BA), and a silane coupling agent (KH570) are used as raw materials to prepare a hydrophobic organosilicon-modified acrylic resin with transparent and wear-resistant properties, which exhibits hydrophobicity, wear resistance, and smoothness functions. After adding hydroxy silicone oil for crosslinking and curing, the mechanical properties are increased. Considering that if the side of the waterproof and moisture-permeable membrane close to the skin is a hydrophobic coating, it is not conducive to the discharge of water vapor, resulting in an increase in the moisture resistance of the composite fabric.

[0007] The invention patent CN107083683A provides a preparation method of a hydrophilic and smooth organosilicon finishing agent, which endows fabrics with excellent smoothness and instant hydrophilicity. However, it has only been tested on cellulose fibers and blended fibers and has not been applied to the printed film coating of composite fabrics. Moreover, for a printed film about 10 μm thick, the rigidity of the surface microstructure is too large, affecting the wearing comfort.

[0008] It can be seen that since the functional film on the side close to the skin is required not only to have functionality but also to be aesthetically pleasing, a functional film with printed patterns is often selected to show the high-class sense of clothing. However, due to the fine texture brought by printing, the surface roughness is increased, and the repeated contact and friction during wearing inevitably cause the printed pattern to become blurred or even damage the film surface, greatly reducing the aesthetics and functionality. Therefore, a finishing agent coating with a smoothness function needs to be added to the surface of the functional film to reduce the frictional resistance without hindering the waterproof and moisture-permeable effect of the functional film, so that the body surface moisture can be discharged in time. At the same time, considering the side in contact with the skin, the long-lasting antibacterial effect is also increased, improving the functionality of the composite fabric. Summary of the Invention

[0009] The purpose of the present invention is to provide a preparation method of an acrylate-based low-resistance and wear-resistant organosilicon finishing agent. Aiming at the defects in the prior art, a low-resistance and wear-resistant organosilicon finishing agent is prepared and applied to the functional film, endowing the functional film with a smoothness function, reducing the frictional resistance without hindering the waterproof and moisture-permeable effect of the functional film, so that the body surface moisture can be discharged in time. At the same time, the long-lasting antibacterial effect is increased, improving the functionality of the composite fabric.

[0010] To solve the above technical problems, the following technical solutions are adopted:

[0011] A preparation method of an acrylate-based low-resistance and wear-resistant organosilicon finishing agent, which is characterized by including the following steps:

[0012] (1) Prepolymer synthesis: Add a solvent into a reaction kettle, stir and heat it to 60 - 85°C. Subsequently, add a mixture of acrylate monomers and silicone monomers in a certain proportion to form a reaction system. Then, add a chain transfer agent into the reaction system to fully dissolve the monomers. Next, dissolve the initiator in the solvent and add it to the reaction system, introduce nitrogen for 15 - 30 min, and slowly heat to 60 - 85°C and keep the reaction for 4 - 6 h to obtain a prepolymer;

[0013] (2) Hydrophilic / hydrophilic antibacterial modification: Sequentially add a modifying monomer and a catalyst into the reaction system in step (1), and continue the reaction at 70 - 90°C for 2 - 4 h to graft the modifying monomer onto the prepolymer molecular chain. After the reaction ends, cool to room temperature;

[0014] (3) Post-treatment: Remove the solvent and unreacted monomers through vacuum distillation or a rotary evaporator to obtain a product. Then, filter the product to remove impurities or gel particles, and finally dry the product under vacuum to obtain a finishing agent.

[0015] Preferably, in step (1), the acrylate monomer is selected from 2-hydroxyethyl acrylate (HEA) or methyl methacrylate (MMA); the silicone monomer is selected from polymethylhydrosiloxane (PMHS) or vinyl silicone oil; the initiator is selected from benzoyl peroxide (BPO) or azobisisobutyronitrile (AIBN); the solvent is selected from toluene or xylene; the chain transfer agent is selected from dodecyl mercaptan.

[0016] Preferably, in step (1), the ratio of the acrylate monomer to the silicone monomer is 2:1 - 4:1.

[0017] Preferably, in step (1), the dosage of the initiator is 0.5% - 2% of the total mass of the monomers, where the total mass of the monomers is the sum of the masses of the acrylate monomer and the silicone monomer.

[0018] Preferably, in step (1), during the reaction process, monitor the reaction progress by measuring the viscosity of the reaction system or using Fourier transform infrared spectroscopy (FTIR), and end the reaction after the monomer conversion rate reaches 90%.

[0019] Preferably, in step (2), the modifying monomer is selected from hydrophilic monomers or hydrophilic antibacterial monomers, and the catalyst is selected from platinum catalysts or triethylamine.

[0020] Preferably, the hydrophilic monomer is selected from 2-hydroxyethyl acrylate (HEA) or acrylic acid (AA); the hydrophilic antibacterial monomer is selected from one or more of quaternary ammonium salt acrylate, guanidine acrylate, functional monomers containing silver or zinc ions, natural antibacterial polymer derivatives, halogen antibacterial monomers, or zwitterionic antibacterial monomers.

[0021] After optimization, the quaternary ammonium salt acrylate is selected from methacryloyloxyethyl trimethyl ammonium chloride (DMC) or dimethylaminoethyl methacrylate (DMAEMA); the guanidine acrylate is selected from methacryloyl guanidine (MAgua); the functional monomer containing silver or zinc ions is selected from silver acrylate (AgAA) or zinc methacrylate (ZnMAA); the natural antibacterial polymer derivative is selected from chitosan grafted glycidyl methacrylate (CS-GMA); the halogen antibacterial monomer is selected from iodoacrylate; the zwitterionic antibacterial monomer is selected from sulfobetaine methacrylate (SBMA).

[0022] In terms of broad-spectrum antibacterial properties: quaternary ammonium salts or guanidine-based compounds are preferably selected. In terms of biocompatibility: chitosan derivatives or zwitterionic monomers are preferred.

[0023] Among them, the structural formula of methacryloyloxyethyl trimethyl ammonium chloride (DMC) is:

[0024] CH 2 =C(CH 3 )COO(CH2) 2 N + (CH 3 ) 3 Cl -

[0025] The structural formula of methacryloyl guanidine (MAgua) is: CH 2 =C(CH 3 )COO(CH 2 ) 3 NH-C(NH)NH 2

[0026] The structural formula of sulfobetaine methacrylate (SBMA) is:

[0027] CH 2 =C(CH 3 )COO(CH 2 ) 2 N + (CH 3 ) 2 CH 2 SO 3 -

[0028] After optimization, in the step (2), the dosage of the modified monomer is 10%-20% of the mass of the prepolymer.

[0029] After optimization, in the step (2), the reaction process is monitored by infrared spectroscopy (FTIR) or nuclear magnetic resonance spectroscopy (NMR) to ensure the successful grafting of the modified monomer.

[0030] After optimization, the reaction kettle includes a frame, a kettle body and an automatic feeding mechanism. The kettle body is installed and fixed through the frame, and is provided with a feeding port, a discharging port and a stirrer; the automatic feeding mechanism is used to automatically add the required raw materials to the feeding port, and includes a lifting assembly and a feeder. The lifting assembly is used to drive the feeder to lift, and includes a lifting motor, a main sprocket, a slave sprocket, a chain and a connecting rod. The lifting motor is connected to the main sprockets on both sides through a main shaft. The main sprocket is connected to the slave sprocket and drives the chain to run. The chain is connected to the connecting rod, and the connecting rod is connected to the feeder; the feeder is used to automatically add the required raw materials to the feeding port, and includes an outer clamping plate, a tipping device and a flipping motor. The tipping device is hinged inside the outer clamping plate, and the flipping motor is connected to and drives the tipping device to flip. After the tipping device flips, it pours materials into the feeding port. A weighing sensor is installed inside the tipping device to weigh the weight of the added raw materials.

[0031] After optimization, the stirrer includes a stirring motor and a stirring shaft. Stirring blades and a wiping frame are connected to the stirring shaft. The wiping frame includes a connecting shaft rod and a wiping rod. One end of the connecting shaft rod is connected to the stirring shaft, and the other end is connected to the wiping rod. The wiping rod rotates following the stirring shaft. A sponge layer is connected to the wiping rod, and the sponge layer contacts the inner wall of the kettle body and wipes the inner wall of the kettle body during rotation; the kettle body is also provided with a cleaning port, and the cleaning port is used to inject clean water to clean the kettle body.

[0032] Due to the adoption of the above technical solution, the following beneficial effects are achieved:

[0033] The present invention prepares a low-resistance and wear-resistant silicone finishing agent. When it is applied to a functional film, it endows the functional film with a smooth function, reduces the frictional resistance without hindering the waterproof and moisture-permeable effect of the functional film, enables the body surface moisture to be discharged in time, and at the same time increases the effect of persistent antibacterial, improving the functionality of the composite fabric.

[0034] After the composite fabric is finished with the silicone finishing agent, the hydrostatic pressure data in the abrasion test increases from 500mmH 2 O to 2000mmH 2 O, and the hydrostatic pressure increases. The wet resistance data in the wet resistance test decreases from about 15m 2 ·Pa / W to 10 - 11m 2 ·Pa / W, and the wet resistance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the drawings:

[0036] Figure 1 is a schematic structural diagram of the reaction kettle;

[0037] Figure 2 is a schematic structural diagram of the kettle body;

[0038] Figure 3 is a schematic structural diagram of the stirring shaft;

[0039] Figure 4 It is a structural schematic diagram of a feeder.

[0040] Among them, the attached drawing reference numerals are: kettle body 1, feed inlet 11, cleaning port 12, temperature measuring port 13, discharge port 14, stirring motor 15, stirring shaft 16, stirring paddle 17, frame 2, lifting assembly 3, lifting motor 31, main shaft 32, main sprocket 33, chain 34, driven sprocket 35, connecting rod 36, feeder 4, outer clamping plate 41, tipping device 42, flipping motor 43, wiping rack 5, coupling rod 51, wiping rod 52, sponge layer 53. Specific embodiments

[0041] The present invention aims to provide a preparation method of an acrylate-based low-resistance and wear-resistant silicone finishing agent. The low-resistance and wear-resistant silicone finishing agent is prepared and applied to a functional film, endowing the functional film with a smooth function, reducing the frictional resistance without hindering the waterproof and moisture-permeable effect of the functional film, enabling the body surface moisture to be discharged in time, and at the same time increasing the long-lasting antibacterial effect and enhancing the functionality of the composite fabric.

[0042] The following uses specific examples to elaborate on the technical solutions of the present invention in detail

[0043] Example 1

[0044] The formulations of each group are shown in Table 1:

[0045] Table 1

[0046] Serial number Composition Mass (grams) 1 2-Hydroxyethyl acrylate (HEA) 6.0 2 Vinyl silicone oil 1.5 3 2,2'-Azobis(2-methylpropionitrile) (AIBN) 0.08 4 Toluene 0.7 5 1-Dodecanethiol 0.1 6 Silane coupling agent KH550 0.2 7 Chitosan graft glycidyl methacrylate (GMA) 0.8 8 Platinum catalyst 0.05 9 Water 27.0

[0047] The preparation steps are as follows:

[0048] (1) Synthesis of prepolymer. In a dry reaction kettle, add toluene, stir and heat until the temperature is stable at 80°C. Subsequently, add a monomer mixture of hydroxyethyl acrylate (HEA) and vinyl silicone oil to a constant pressure dropping funnel. Then, add a chain transfer agent, dodecyl mercaptan, to the reaction system. After the mixture is fully dissolved, dissolve the initiator AIBN in a small amount of toluene and slowly add it to the reaction system. Pass nitrogen for 15 - 30 minutes, stabilize the reaction system to 85°C, and carry out a constant temperature reaction for 4 - 6 hours.

[0049] (2) After the synthesis of the prepolymer is completed, add a hydrophilic and antibacterial modified monomer, chitosan grafted glycidyl methacrylate (GMA), to the reaction system, add an appropriate amount of platinum catalyst, and continue the grafting reaction at 70 - 90°C for 2 - 4 hours to graft the modified monomer onto the prepolymer molecular chain.

[0050] (3) Post-treatment: Remove the solvent and unreacted monomers by vacuum distillation or rotary evaporator to obtain the product. Then filter the product to remove impurities or gel particles, and finally dry the product to obtain the finishing agent.

[0051] Example 2

[0052] The formulations of each group are shown in Table 2:

[0053] Table 2

[0054]

[0055]

[0056] The preparation steps are as follows:

[0057] (1) Synthesis of prepolymer: In a dry reaction kettle, add an appropriate amount of xylene, stir and heat until the temperature is stable at 85°C. Subsequently, add the monomer mixture of methyl methacrylate (MMA) and hydrogen-containing silicone oil (PMHS) to the constant-pressure dropping funnel. Then add the chain transfer agent dodecyl mercaptan to the reaction system. After the mixture is fully dissolved, dissolve the initiator AIBN in a small amount of xylene and slowly add it to the reaction system. Pass nitrogen for 15 - 30 minutes, stabilize the reaction system to 85°C, and carry out the constant-temperature reaction for 4 - 6 hours.

[0058] (2) After the synthesis of the prepolymer is completed, add the hydrophilic antibacterial modified monomer sulfobetaine methacrylate (SBMA) to the reaction system, add an appropriate amount of platinum catalyst, and continue the catalytic grafting reaction at 70 - 90°C for 2 - 4 hours to graft the modified monomer onto the prepolymer molecular chain.

[0059] (3) Post-treatment: Remove the solvent and unreacted monomers by vacuum distillation or rotary evaporator to obtain the product. Then filter the product to remove impurities or gel particles, and finally dry the product to obtain the finishing agent.

[0060] Example 3

[0061] The formulations of each group are shown in Table 3:

[0062] Table 3

[0063] z-3 Composition Mass (unit: grams) 1 2-Hydroxyethyl acrylate (HEA) 5.0 2 Hydrogen-containing silicone oil (PMHS) 1.5 3 2,2'-Azobis(2-methylpropionitrile) (AIBN) 0.10 4 Toluene 1.2 5 1-Dodecanethiol 0.1 6 Silane coupling agent KH550 0.25 7 Methacryloyl guanidine (MAgua) 0.85 8 Platinum catalyst 0.05 9 Water 27.0

[0064] The preparation steps are as follows:

[0065] (1) Synthesis of prepolymer: In a dry reactor, add an appropriate amount of toluene, stir and heat until the temperature stabilizes at 85°C. Subsequently, add a monomer mixture of methyl methacrylate (MMA) and polymethylhydrosiloxane (PMHS) to a constant pressure dropping funnel. Then, add a chain transfer agent, dodecyl mercaptan, to the reaction system. After the mixture is fully dissolved, dissolve the initiator AIBN in a small amount of toluene and slowly add it to the reaction system. Pass nitrogen for 15 - 30 minutes, stabilize the reaction system to 85°C, and carry out the constant temperature reaction for 4 - 6 hours.

[0066] (2) After the synthesis of the prepolymer is completed, add a hydrophilic antibacterial modified monomer, methacryloyl guanidine (MAgua), to the reaction system, add an appropriate amount of platinum catalyst, and continue the catalytic grafting reaction at 70 - 90°C for 2 - 4 hours to graft the modified monomer onto the prepolymer molecular chain.

[0067] (3) Post-treatment: Remove the solvent and unreacted monomers through vacuum distillation or a rotary evaporator to obtain the product. Then, filter the product to remove impurities or gel particles. Finally, dry the product to obtain the finishing agent.

[0068] The following tests were carried out on the finishing agents prepared in Examples 1 - 3

[0069] 1. Materials: Finishing agent 1 prepared in Example 1, finishing agent 2 prepared in Example 2, finishing agent 3 prepared in Example 3, commercially available finishing agent 1, commercially available finishing agent 2, and a 70 gsm waterproof and moisture-permeable outdoor sports composite fabric.

[0070] 2. Process: The finishing agent was applied to the functional film of the composite fabric by padding (liquor pickup rate 70 - 80%), baked at 160°C for 1 minute, and fully moisturized to evaluate the performance.

[0071] 3. Test results:

[0072] The following data were obtained from the tests on the unprocessed functional film: 1 After 1000 Martindale rotations, the hydrostatic pressure resistance test was carried out, and the hydrostatic pressure resistance value was 500 mmH 2 O; 2 Moisture resistance 15 m 2 ·Pa / W; 3 Moisture permeability 29000 g / (m*24h))

[0073] The abrasion resistance test refers to GBT 4802.2 - 2008 Textiles - Determination of pilling of fabrics - Martindale method

[0074] The hydrostatic pressure resistance test refers to JIS L1092:2020 Section 7.1, Method B)

[0075] The moisture permeability refers to JIS L1099:2021 Method B - 1

[0076] The water-vapour resistance refers to ISO 11092-2014, water-vapour resistance (RET).

[0077] The antibacterial property refers to GB / T 20944.3 "Evaluation of antibacterial properties of textiles - Part 3: Quantitative test method", and the bacterial strains are: Staphylococcus aureus ATCC6538, Escherichia coli ATCC8739. The antibacterial property of the specimen is expressed by the antibacterial rate. The results of the hydrostatic pressure resistance test are shown in Table 4

[0078] Table 4

[0079]

[0080]

[0081] b The results of the water-vapour resistance test are shown in Table 5

[0082] Table 5

[0083] Serial number Finishing agent <![CDATA[Wet resistance RET (m 2 ·Pa / W)]]> 1 z-1 11 2 z-2 10 3 z-3 12 4 Slippery agent A on the market 15 5 Slippery agent B on the market 20

[0084] c The results of the moisture permeability are shown in Table 6

[0085] Table 6

[0086] Serial number Finishing agent Moisture permeability (g / (m*24h)) 1 z-1 30000 2 z-2 34000 3 z-3 29000 4 Slippery agent A on the market 13000 5 Slippery agent B on the market 10000

[0087] d The antibacterial property results are shown in Table 7

[0088] Table 7

[0089] Serial number Finishing agent Staphylococcus aureus / % Escherichia coli / % 1 z-1 96 97 2 z-2 95 95 3 z-3 93 94

[0090] As Figures 1 to 4As shown in the figure, the reactors used in Examples 1-3 include a frame 2, a kettle body 1 and an automatic feeding mechanism. The frame 2 is arranged outside the kettle body 1 and is used to fixedly install the kettle body 1. The kettle body 1 is provided with a feeding port 11, a cleaning port 12, a temperature measuring port 13, a discharging port 14 and a stirrer. The feeding port 11 is located at the upper end of the kettle body 1 and is provided with a feeding hopper for expanding the opening to facilitate the pouring of materials by the automatic feeding mechanism. A valve is also arranged at the feeding port 11 to facilitate the control of its opening or closing. The discharging port 14 is arranged at the lower end of the kettle body 1 for discharging materials after the reaction is completed. The cleaning port 12 is arranged at the upper end of the kettle body 1 for injecting cleaning liquid to facilitate the cleaning of the inner wall of the kettle body 1. The temperature measuring port 13 is arranged at the upper end of the kettle body 1 for detecting the reaction temperature inside the kettle body 1. The stirrer includes a stirring motor 15 and a stirring shaft 16. A stirring paddle 17 and a wiping frame 5 are connected to the stirring shaft 16. The stirring paddle 17 is used to stir the reaction system. The wiping frame 5 rotates with the stirring shaft 16 and is used to wipe the inner wall of the kettle body 1 to keep the inner wall of the kettle body 1 clean. At the same time, it can scrape the raw materials adhered to the inner wall of the kettle body 1 into the reaction system, so as to make full use of the raw materials. The wiping frame 5 includes a connecting shaft rod 51 and a wiping rod 52. There are two connecting shaft rods 51. One end of each connecting shaft rod 51 is connected to the stirring shaft 16, and the other end is connected to the wiping rod 52, so that the wiping rod 52 rotates with the stirring shaft 16. A sponge layer 53 is connected to the outer surface of the wiping rod 52. The sponge layer 53 contacts the inner wall of the kettle body 1 and wipes the inner wall of the kettle body 1 during rotation; after the reaction is completed, the inside of the kettle body 1 can be cleaned. Clean water is injected into the kettle body 1 through the cleaning port 12, and at the same time, the stirrer is started, and the inside of the kettle body 1 is comprehensively cleaned with the help of the wiping frame 5, and the cleaning effect is remarkable.

[0091] The automatic feeding mechanism is used to automatically add the required raw materials to the feeding port 11. It includes a lifting component 3 and a feeder 4. The lifting component 3 is installed on the frame 2 and is used to drive the feeder 4 to lift and lower. It includes a lifting motor 31, a main sprocket 33, a slave sprocket 35, a chain 34 and a connecting rod 36. The lifting motor 31 is connected to the main sprockets 33 on both sides through a main shaft 32. The main sprocket 33 is driven by the chain 34 and the slave sprocket 35 at the lower end, so as to drive the chain 34 to run. The two ends of the chain 34 are connected to a connecting piece, and this connecting piece is connected to the connecting rod 36. The connecting rods 36 on both sides are respectively connected to both sides of the feeder 4, so as to achieve the purpose of driving the feeder 4 to lift and lower; the feeder 4 is used to automatically add the required raw materials to the feeding port 11. It includes an outer clamping plate 41, a pouring device 42 and a flipping motor 43. The pouring device 42 is hinged inside the outer clamping plate 41, that is, the pouring device 42 can rotate relative to the outer clamping plate 41. The flipping motor 43 is connected to and drives the pouring device 42 to flip. After the pouring device 42 flips, it pours materials into the feeding port 11. A weighing sensor (not marked in the figure) is installed inside the pouring device 42 for weighing the weight of the added raw materials, and a display screen for displaying the weight is arranged on the surface of the pouring device 42. The flipping motor 43 can rotate forward and backward, and the range of forward and backward rotation is limited, which is determined according to the rotation range of the pouring device 42.

[0092] The feeding process of this automatic feeding mechanism is as follows:

[0093] 1. The feeder 4 descends to the low position, and the staff adds the required raw materials into the feeder 4 until the required weight is reached.

[0094] 2. The lifting component 3 is activated to drive the feeder 4 to rise to the designed high position.

[0095] 3. The tilting motor 43 is activated to drive the dumper 42 to rotate 120° towards the feed inlet 11 and dump materials for 20 - 30 seconds; after the dumping is completed, the tilting motor 43 rotates in the reverse direction to drive the dumper 42 to return to its original position.

[0096] 4. The lifting component 3 is activated to drive the feeder 4 to descend to the low position.

[0097] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent, characterized in that The steps include: (1) Prepolymer synthesis: Add a solvent to a reaction kettle, stir and heat to 60-85°C, then add a mixture of acrylate monomer and silicone monomer in a certain proportion to form a reaction system; then add a chain transfer agent to the reaction system, and then dissolve the initiator in the solvent and add it to the reaction system, introduce nitrogen for 15-30 minutes, and keep the temperature at 60-85°C for 4-6 hours to obtain a prepolymer; (2) Hydrophilic / hydrophilic antibacterial modification: adding modified monomers and catalysts to the reaction system of step (1) in sequence, continuing the reaction at 70-90° C. for 2-4 hours, and cooling to room temperature after the reaction is completed; (3) Post-treatment: The solvent and unreacted monomers are removed by vacuum distillation or rotary evaporation to obtain a product, which is then filtered to remove impurities or gel particles, and finally the product is dried to obtain a finishing agent.

2. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 1, characterized in that: In the step (1), the acrylate monomer is hydroxyethyl acrylate or methyl methacrylate; the silicone monomer is hydrogenated silicone oil or vinyl silicone oil; the initiator is benzoyl peroxide or diisobutyronitrile; the solvent is toluene or xylene; and the chain transfer agent is dodecyl mercaptan.

3. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 1, characterized in that: In the step (1), the ratio of acrylate monomer to silicone monomer is 2:1-4:1; the amount of initiator used is 0.5%-2% of the total mass of the monomers, wherein the total mass of the monomers is the sum of the mass of the acrylate monomer and the silicone monomer.

4. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 1, characterized in that: In the step (2), the modified monomer is a hydrophilic monomer or a hydrophilic antibacterial monomer, and the catalyst is a platinum catalyst or triethylamine.

5. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 4, characterized in that: The hydrophilic monomer is selected from hydroxyethyl acrylate or acrylic acid; the hydrophilic antibacterial monomer is selected from one or more of quaternary ammonium acrylate, guanidine acrylate, functional monomer containing silver or zinc ion, natural antibacterial polymer derivative, halogen antibacterial monomer or zwitterionic antibacterial monomer.

6. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 5, characterized in that: The quaternary ammonium salt acrylate is selected from methacryloyloxyethyl trimethylammonium chloride or dimethylaminoethyl methacrylate; the guanidine-based acrylate is selected from methacryloylguanidine; the functional monomer containing silver or zinc ions is selected from silver acrylate or zinc methacrylate; the natural antibacterial polymer derivative is selected from chitosan grafted glycidyl methacrylate; the halogen antibacterial monomer is selected from iodinated acrylate; and the zwitterionic antibacterial monomer is selected from sulfonate betaine methacrylate.

7. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 1, characterized in that: In the step (2), the amount of the modified monomer is 10%-20% of the mass of the prepolymer.

8. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 1, characterized in that: In the step (1), the reaction progress is monitored by measuring the viscosity of the reaction system or using infrared spectroscopy during the reaction, and the reaction is terminated after the monomer conversion rate reaches 90%. In the step (2), the reaction progress is monitored by infrared spectroscopy or nuclear magnetic resonance spectroscopy during the reaction to ensure successful grafting of the modified monomer.

9. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 1, characterized in that: The reactor comprises a frame, a reactor body and an automatic feeding mechanism, wherein the reactor body is fixedly mounted on the frame and is provided with a feed port, a discharge port and an agitator; the automatic feeding mechanism is used for automatically adding required raw materials to the feed port, and comprises a lifting assembly and a feeder, wherein the lifting assembly is used for driving the feeder to lift and lower, and comprises a lifting motor, a main sprocket, a slave sprocket, a chain and a connecting rod, wherein the lifting motor is connected to the main sprockets on both sides through a main shaft, wherein the main sprocket is connected to the slave sprocket and drives the chain to run, wherein the chain is connected to the connecting rod, and wherein the connecting rod is connected to the feeder; the feeder is used for automatically adding required raw materials to the feed port, and comprises an outer splint, a pourer and a flip motor, wherein the pourer is hingedly mounted in the outer splint, wherein the flip motor is connected and drives the pourer to flip, wherein the pourer flips and pours the raw materials to the feed port, and wherein a weighing sensor is installed in the pourer for weighing the weight of the added raw materials.

10. The method for preparing an acrylic low-resistance and wear-resistant silicone finishing agent according to claim 9, characterized in that: The agitator includes a stirring motor and a stirring shaft, the stirring shaft is connected with a stirring blade and a wiping rack, the wiping rack includes a connecting rod and a wiping rod, one end of the connecting rod is connected to the stirring shaft, and the other end thereof is linked to the wiping rod, the wiping rod rotates with the stirring shaft, the wiping rod is connected with a sponge layer, the sponge layer contacts the inner wall of the kettle body, and wipes the inner wall of the kettle body during rotation; the kettle body is also provided with a cleaning port, and the cleaning port is used to inject clean water to clean the kettle body.

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