A hydrophobic, oleophobic and anti-graffiti nano-coating and its preparation method

Abstract

The present invention relates to the technical field of coating preparation, and discloses a hydrophobic, oleophobic and anti-graffiti nano-coating and a preparation method thereof. The coating composition comprises the following raw materials in parts by weight: 60-80 parts of a modified alkoxy-containing silicon polymer, 0-2 parts of an antifoaming agent, 0-5 parts of a hindered amine light stabilizer, 1-20 parts of an additive solvent, and 1-6 parts of a coupling agent; the preparation method of the coating composition is as follows: First, prepare the modified alkoxy-containing silicon polymer; then, add the coupling agent and the isoparaffin diluent into component A to obtain a component B solution; finally, add a polyether-modified polydimethylsiloxane copolymer antifoaming agent, a strong gel catalyst, and a hindered amine light stabilizer into the component B solution to prepare a finished product. The coating composition proposed by the present invention has good hydrophobic properties, good oleophobic and anti-fouling effects, fast drying speed, high brightness, and good self-leveling effect.

Description

Technical Field

[0001] The present invention relates to the field of coating preparation, and more specifically, it relates to a hydrophobic, oleophobic and anti-graffiti nano-coating and a preparation method thereof. Background Art

[0002] Metal, stone, ceramic tile, wood product, plastic product, leather ware and other different objects can be contacted everywhere in public places or at home. With the increase of the service life, problems such as different degrees of wear, aging and easy contamination will appear on the surface. However, the already installed devices are not easy to disassemble and then sent to the factory for surface coating processing. Moreover, even if on-site coating is adopted, spraying paint will cause secondary pollution to the site, and even aerosol particles will be generated during spraying, bringing physical harm to the operators. In the face of these problems, a nano-coating that can be applied for construction, is easy to operate and has the functions of hydrophobic and anti-fouling is needed to solve the above problems. Here, hydrophobic means that the low surface energy can achieve a water-repellent effect, and water is less likely to adhere to the surface. Oleophobic means that after writing with an oil-based pen, it can be easily wiped clean with a dry paper towel or a rag. Having oleophobicity means having the function of anti-fouling and easy cleaning, and surface oil stains are also easier to clean. Summary of the Invention

[0003] The present invention provides a hydrophobic, oleophobic and anti-graffiti nano-coating and a preparation method thereof to solve the above-mentioned technical problems in the related art.

[0004] A hydrophobic, oleophobic and anti-graffiti nano-coating includes the following raw materials in parts by weight: 60 - 80 parts of a modified alkoxy-containing silicon polymer, 0 - 2 parts of an antifoaming agent, 0 - 5 parts of a hindered amine light stabilizer, 1 - 20 parts of an additive solvent, and 1 - 6 parts of a coupling agent.

[0005] Further: The additive solvent includes a diluent and an isoparaffin strong gel catalyst.

[0006] Further: The coupling agent is one of an amino-based auxiliary agent, a vinyl-based auxiliary agent, and a multi-functional and highly efficient organic-based auxiliary agent.

[0007] Further: The multi-functional and highly efficient organic-based auxiliary agent is N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0008] Further: The diluent is an isoparaffin diluent with a boiling point of 140 - 170°C.

[0009] Further: The modified alkoxy-containing silicon polymer is prepared from an alkoxy-containing polysiloxane intermediate, a hydrophobic nano-silica filler, a methoxysilyl-terminated polyether, a hydroxyl-containing dimethylsiloxane, and a titanate catalyst.

[0010] Further: The number average molecular weight of the methoxysilyl-terminated polyether is 1000 - 5000.

[0011] Furthermore, the viscosity of the hydroxy dimethyl siloxane is less than or equal to 300 mPa·s at a temperature of 25°C.

[0012] Furthermore: the titanate catalyst is one of monoalkoxy type, coordination type and chelating type.

[0013] Furthermore: the defoaming agent is a polyether-modified polydimethylsiloxane copolymer.

[0014] A method for preparing a hydrophobic and oleophobic anti-graffiti nano coating comprises the following steps:

[0015] S1: Preparation of component A

[0016] Adding an alkoxy-containing polysiloxane intermediate, a hydrophobic nano-silica filler, a methoxysilyl-terminated polyether, a hydroxyl-containing dimethylsiloxane, and a titanate catalyst into a mixing device, stirring and mixing them thoroughly, and discharging the material to obtain a modified alkoxy-containing silicon polymer, which is recorded as component A;

[0017] S2: Preparation of component B

[0018] Add the coupling agent and isoparaffin diluent to component A, stir for 3-5 minutes, pour into a clean and dry jar with a heating device, seal it, heat the outer periphery of the jar to 30-40°C, react for more than 48 hours, let it stand at room temperature, then discharge the material to obtain component B solution;

[0019] S3: Preparation of finished materials

[0020] Add the polyether modified polydimethylsiloxane copolymer defoamer, strong gel catalyst, hindered amine light stabilizer, and component B solution, stir at a speed of 300-500 rpm for 3-5 minutes, and then discharge the material. After discharging, seal and store it.

[0021] A mixing device comprises a mixing tank, in which a stirring assembly for stirring a solution, two groups of washboards, a transfer assembly and an adjustment assembly are installed, the transfer assembly and the adjustment assembly are both connected to the two groups of washboards, the transfer assembly is used to drive the two groups of washboards to rotate and extend out of the solution, the adjustment assembly is used to drive the two groups of washboards to move relative to each other and approach or move away from each other, and also comprises a flushing assembly and a crushing assembly, the flushing assembly is used to flush agglomerates between the two groups of washboards, and the crushing assembly is used to crush the powder agglomerates flushed down by the flushing assembly.

[0022] Furthermore: the stirring assembly includes a stirring rod and a stirring motor, the stirring rod is installed inside the mixing tank and is located below the crushing assembly, the stirring motor is installed at the bottom of the mixing tank, and the output shaft of the stirring motor passes through the mixing tank and is connected to the stirring rod.

[0023] Further: The transfer component includes a driving motor and a bracket. The output shaft of the driving motor penetrates and extends into the interior of the mixing tank, and one end extending into the mixing tank is connected to one end of the bracket. The length direction of the bracket is perpendicular to the axis of the output shaft of the driving motor. The end of the bracket away from the output shaft of the driving motor is connected to the scrubbing plate.

[0024] Further: The adjusting component includes a first motor and a fixed rod. The fixed rod is connected to the end of the bracket away from the output shaft of the driving motor. The length direction of the fixed rod is perpendicular to the length direction of the bracket. A connecting plate is installed on one side of the fixed rod. The connecting plate is connected to the scrubbing plate. A slider is installed on the side surface of the connecting plate close to the fixed rod. A chute is opened inside the fixed rod. The chute and the slider form a sliding guiding fit. The cross-sections of the slider and the chute are both rectangular. A bidirectional lead screw is installed in the chute. Both ends of the bidirectional lead screw are rotatably connected to the inner wall of the chute, and the bidirectional lead screw penetrates the slider and forms a sliding guiding fit with the slider.

[0025] Further: The adjusting component further includes a second motor and a turntable. The second motor is connected to the connecting plate. A turntable is installed on the side surface of the connecting plate close to the scrubbing plate. One side surface of the turntable is rotatably connected to the connecting plate, and a connecting rod is installed at the eccentric position on the other side surface. A limiting groove is opened on the side surface of the connecting plate close to the scrubbing plate. A limiting block is installed on the side surface of the scrubbing plate. The limiting block is arranged inside the limiting groove and forms a sliding guiding fit with the limiting groove. The cross-sections of the limiting block and the limiting groove are both T-shaped. One end of the connecting rod is rotatably connected to the eccentric position of the turntable, and the other end is rotatably connected to the limiting block.

[0026] Further: The flushing component includes a spray head, a water delivery pipe and a pump body. The spray head is installed on the inner top of the mixing tank and is located above the crushing component, and the spray head corresponds to the gap between the two scrubbing plates. One end of the water delivery pipe is connected to the spray head, and the other end is located in the solution. The pump body is connected to the water delivery pipe. Filter meshes are installed on the outer walls of the two scrubbing plates.

[0027] Further: The crushing component further includes a roller shaft, a kneading belt sleeved on the roller shaft, a kneading motor for driving the roller shaft to rotate, and a housing. Both ends of the roller shaft are rotatably connected to the inner wall of the housing. The kneading motor is installed on the outer wall of the mixing tank. The output shaft of the kneading motor penetrates the mixing tank and the housing and is connected to one end of the roller shaft. There are two groups of kneading belts and kneading motors. The two groups of kneading belts are both arranged vertically and are parallel to each other. The two groups of kneading motors drive the two kneading belts to rotate in opposite directions and at different speeds.

[0028] The beneficial effects of the present invention are as follows: The coating composition proposed by the present invention has good hydrophobic properties, good oil-repellent and anti-fouling effects, fast drying speed, high brightness, and good self-leveling effect;

[0029] The preparation method of the present invention has simple steps and is easy to implement, and can realize the rapid preparation of the coating composition;

[0030] When the mixing device of the present invention crushes agglomerates, it can crush the agglomeration of powder materials and the mixed agglomeration of powder and particles. Description of the Drawings

[0031] Figure 1 It is a schematic flow chart of a method for preparing a hydrophobic, oleophobic and anti-graffiti nano-coating proposed by the present invention.

[0032] Figure 2 It is a schematic structural diagram of a mixing device used in a method for preparing a hydrophobic, oleophobic and anti-graffiti nano-coating proposed by the present invention;

[0033] Figure 3 It is a partial internal view of the mixing tank of the mixing device used in a method for preparing a hydrophobic, oleophobic and anti-graffiti nano-coating proposed by the present invention;

[0034] Figure 4 It is a sectional view of the mixing tank of the mixing device used in a method for preparing a hydrophobic, oleophobic and anti-graffiti nano-coating proposed by the present invention;

[0035] Figure 5 It is a top view of the scrubbing plate of the mixing device used in a method for preparing a hydrophobic, oleophobic and anti-graffiti nano-coating proposed by the present invention;

[0036] Figure 6 It is a side sectional view of the outer shell of the mixing device used in a method for preparing a hydrophobic, oleophobic and anti-graffiti nano-coating proposed by the present invention;

[0037] Figure 7 It is a mixing device used in a method for preparing a hydrophobic, oleophobic and anti-graffiti nano-coating proposed by the present invention Figure 4 Enlarged view of part A;

[0038] Figure 8 It is a mixing device used in a method for preparing a hydrophobic, oleophobic and anti-graffiti nano-coating proposed by the present invention Figure 5 Enlarged view of part B.

[0039] In the figure: 1. Mixing tank; 11. Stirring assembly; 111. Stirring motor; 112. Stirring rod; 12. Transfer assembly; 121. Driving motor; 122. Bracket; 13. Adjusting assembly; 131. First motor; 132. Fixed rod; 133. Chute; 134. Slide block; 135. Bi-directional lead screw; 136. Second motor; 137. Connecting plate; 1371. Limiting groove; 138. Turntable; 139. Connecting rod; 14. Scrubbing plate; 141. Limiting block; 142. Filter screen; 2. Crushing assembly; 21. Roller shaft; 22. Rubbing belt; 23. Rubbing motor; 24. Outer shell; 3. Flushing assembly; 31. Sprayer; 32. Water delivery pipe; 33. Pump body. Detailed Embodiments

[0040] Reference will now be made to exemplary embodiments to discuss the subject matter described herein. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0041] Example 1

[0042] In this example, a hydrophobic and oleophobic anti-graffiti nano-coating is proposed, which comprises the following raw materials in parts by weight: 60 parts of a modified alkoxy-containing silicon polymer, 1 part of an additive solvent, and 1 part of a coupling agent.

[0043] Among them:

[0044] The additive solvent includes a diluent and an isoparaffin strong gel catalyst.

[0045] The coupling agent is one of an amino-based auxiliary agent, a vinyl-based auxiliary agent, and a multifunctional and highly efficient organic-based auxiliary agent. The multifunctional and highly efficient organic-based auxiliary agent is N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0046] The diluent is an isoparaffin diluent with a boiling point of 140 °C.

[0047] The modified alkoxy-containing silicon polymer is prepared from an alkoxy-containing polysiloxane intermediate, a hydrophobic nano-silica filler, a methoxysilyl-terminated polyether, a hydroxy-containing dimethylsiloxane, and a titanate catalyst.

[0048] The number-average molecular weight of the methoxysilyl-terminated polyether is 1000.

[0049] The viscosity of the hydroxy-containing dimethylsiloxane is less than or equal to 300 mPa·s at a temperature of 25 °C.

[0050] The titanate catalyst is one of a monoalkoxy type, a coordination type, and a chelating type.

[0051] Example 2

[0052] In this example, a hydrophobic and oleophobic anti-graffiti nano-coating is proposed, which comprises the following raw materials in parts by weight: 70 parts of a modified alkoxy-containing silicon polymer, 2 parts of an antifoaming agent, 2 parts of a hindered amine light stabilizer, 10 parts of an additive solvent, and 3 parts of a coupling agent.

[0053] Among them:

[0054] The additive solvent includes a diluent and an isoparaffin strong gel catalyst.

[0055] The coupling agent is one of amino group additives, vinyl group additives, and multifunctional high-efficiency organic group additives. The multifunctional high-efficiency organic group additive is N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0056] The diluent is an isoparaffin diluent with a boiling point of 155°C.

[0057] The modified alkoxy-containing silicon polymer is prepared from an alkoxy-containing polysiloxane intermediate, a hydrophobic nano-silica filler, a methoxysilyl-terminated polyether, a hydroxy-containing dimethylsiloxane, and a titanate catalyst.

[0058] The number-average molecular weight of the methoxysilyl-terminated polyether is 3000.

[0059] The viscosity of the hydroxy-containing dimethylsiloxane is less than or equal to 300 mPa·s at a temperature of 25°C.

[0060] The titanate catalyst is one of the monoalkoxy type, coordination type, and chelating type.

[0061] The defoaming agent is a polyether-modified polydimethylsiloxane copolymer.

[0062] Example 3

[0063] In this example, a hydrophobic and oleophobic anti-graffiti nano-coating is proposed, which includes the following raw materials in parts by weight: 80 parts of the modified alkoxy-containing silicon polymer, 2 parts of the defoaming agent, 5 parts of the hindered amine light stabilizer, 20 parts of the added solvent, and 6 parts of the coupling agent.

[0064] Among them:

[0065] The added solvent includes a diluent and an isoparaffin strong gel catalyst.

[0066] The coupling agent is one of amino group additives, vinyl group additives, and multifunctional high-efficiency organic group additives. The multifunctional high-efficiency organic group additive is N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane.

[0067] The diluent is an isoparaffin diluent with a boiling point of 170°C.

[0068] The modified alkoxy-containing silicon polymer is prepared from an alkoxy-containing polysiloxane intermediate, a hydrophobic nano-silica filler, a methoxysilyl-terminated polyether, a hydroxy-containing dimethylsiloxane, and a titanate catalyst.

[0069] The number-average molecular weight of the methoxysilyl-terminated polyether is 5000.

[0070] The viscosity of the hydroxy-containing dimethylsiloxane is less than or equal to 300 mPa·s at a temperature of 25°C.

[0071] Titanate catalysts are of the monoalkoxy type, coordination type, and chelate type.

[0072] The defoaming agent is a polyether modified polydimethylsiloxane copolymer.

[0073] Example 4

[0074] Reference Figure 1 In this embodiment, a method for preparing a hydrophobic and oleophobic anti-graffiti nano coating is proposed, comprising the following steps:

[0075] S1: Preparation of component A

[0076] The alkoxy-containing polysiloxane intermediate, hydrophobic nano-silica filler, methoxysilyl-terminated polyether, hydroxyl-containing dimethylsiloxane, and titanate catalyst are mixed in a mixing device, and the modified alkoxy-containing silicon polymer is obtained by discharging the material, which is recorded as component A;

[0077] S2: Preparation of component B

[0078] Add the coupling agent and isoparaffin diluent to component A, stir for 3-5 minutes, pour into a clean and dry jar with a heating device, seal it, heat the outer periphery of the jar to 30-40°C, react for more than 48 hours, let it stand at room temperature, then discharge the material to obtain component B solution;

[0079] S3: Preparation of finished materials

[0080] Add the polyether modified polydimethylsiloxane copolymer defoamer, strong gel catalyst, hindered amine light stabilizer, and component B solution, stir at a speed of 300-500 rpm for 3-5 minutes, and then discharge the material. After discharging, seal and store it.

[0081] Example 5

[0082] In this example, a coating composition was prepared according to the preparation method of Example 4, and its raw materials and proportions were as follows:

[0083] Table 1: Proportional ingredients for component A

[0084]

[0085] Table 2: Proportional ingredients for component B

[0086]

[0087] Table 3: Finished product output

[0088]

[0089] Example 6

[0090] In this embodiment, a coating composition is prepared according to the preparation method of Embodiment 4, and its raw materials and proportions are as follows:

[0091] Table 1: Ingredients are proportioned into Component A

[0092]

[0093] Table 2: Ingredients are proportioned into Component B

[0094]

[0095] Table 3: Finished product discharge

[0096]

[0097] Example 7:

[0098] In this embodiment, a coating composition is prepared according to the preparation method of Embodiment 4, and its raw materials and proportions are as follows:

[0099] Table 1 Ingredients are proportioned into Component A

[0100]

[0101] Table 2: Ingredients are proportioned into Component B

[0102]

[0103] Table 3: Finished product discharge

[0104]

[0105] Example 8:

[0106] In this embodiment, a coating composition is prepared according to the preparation method of Embodiment 4, and its raw materials and proportions are as follows:

[0107] Table 1: Ingredients are proportioned into Component A

[0108]

[0109] Table 2: Ingredients are proportioned into Component B

[0110]

[0111] The product performances of Examples 5 - 8 (tested according to relevant standards) are as follows in the table:

[0112]

[0113] As can be seen from the above table, the coating compositions prepared in Example 5 and Example 8 have a larger hydrophobic angle, and the hydrophobic effect of the coating compositions prepared in Example 5 and Example 8 is better than that of the coating compositions prepared in Example 6 and Example 7. Among them, the coating composition prepared in Example 5 has the largest hydrophobic angle and the best hydrophobic effect.

[0114] The antifouling properties of the coating compositions prepared in Example 5 and Example 8 are better than those of the coating compositions prepared in Example 6 and Example 7.

[0115] The finger-drying speed of the coating compositions prepared in Example 5 and Example 6 is better than that of the coating compositions prepared in Example 7 and Example 8.

[0116] The brightness of the coating compositions prepared in Example 5, Example 6, and Example 8 is higher than that of the coating composition prepared in Example 7. Among them, the coating composition prepared in Example 5 has the highest brightness.

[0117] The self-leveling effect of the coating compositions prepared in Example 5 and Example 6 is better than that of the coating compositions prepared in Example 7 and Example 8.

[0118] As can be seen from the above, the comprehensive effect of the coating composition prepared in Example 5 is the best.

[0119] Example 9

[0120] In step 2 of Example 4, it is necessary to mix an alkoxy-containing polysiloxane intermediate, a hydrophobic nano-silica filler, a methoxysilyl-terminated polyether, a hydroxyl-containing dimethylsiloxane, and a titanate catalyst. These materials include solid particles, powders, and solvents of the same size. During the mixing process, agglomerated materials will appear. The agglomerated materials include the agglomeration of powder materials and the mixed agglomeration of powders and particles, and the agglomerated materials have a large viscosity. Using a traditional stirring mechanism, the stirring and dispersion effect is not good. When using a crushing mechanism to crush the agglomerated materials while stirring, the crushing mechanism will crush the solid particles into particles smaller than the standard particle size, which cannot meet the coating requirements. To solve this problem, a mixing device used in step 2 of Example 4 is proposed in this example.

[0121] Reference Figures 2 - 8 , the mixing device includes a mixing tank 1. Inside the mixing tank 1, a stirring component 11 for stirring the solution, two sets of rubbing plates 14, a transfer component 12, and an adjusting component 13 are installed. The transfer component 12 and the adjusting component 13 are both connected to the two sets of rubbing plates 14. The transfer component 12 is used to drive the two sets of rubbing plates 14 to rotate and extend out of the solution, and the adjusting component 13 is used to drive the two sets of rubbing plates 14 to move relative to each other and approach or move away from each other. It also includes a flushing component 3 and a crushing component 2. The flushing component 3 is used to flush the agglomerated materials between the two sets of rubbing plates 14, and the crushing component 2 is used to crush the powder agglomerates flushed by the flushing component 3.

[0122] The stirring assembly 11 includes a stirring rod 112 and a stirring motor 111. The stirring rod 112 is installed inside the mixing tank 1 and is located below the crushing assembly 2. The stirring motor 111 is installed at the bottom of the mixing tank 1. The output shaft of the stirring motor 111 penetrates through the mixing tank 1 and is connected to the stirring rod 112.

[0123] The transfer assembly 12 includes a driving motor 121 and a bracket 122. The output shaft of the driving motor 121 penetrates and extends into the mixing tank 1. One end extending into the mixing tank 1 is connected to one end of the bracket 122. The length direction of the bracket 122 is perpendicular to the axis of the output shaft of the driving motor 121. One end of the bracket 122 far from the output shaft of the driving motor 121 is connected to the scrubbing plate 14.

[0124] The adjusting assembly 13 includes a first motor 131 and a fixing rod 132. The fixing rod 132 is connected to one end of the bracket 122 far from the output shaft of the driving motor 121. The length direction of the fixing rod 132 is perpendicular to the length direction of the bracket 122. One side of the fixing rod 132 is provided with an adapter plate 137. The adapter plate 137 is connected to the scrubbing plate 14. One side surface of the adapter plate 137 close to the fixing rod 132 is provided with a slider 134. A chute 133 is formed inside the fixing rod 132. The chute 133 and the slider 134 form a sliding guiding fit. The cross-sections of the slider 134 and the chute 133 are both rectangular. A bidirectional lead screw 135 is installed in the chute 133. Both ends of the bidirectional lead screw 135 are rotatably connected to the inner wall of the chute 133. The bidirectional lead screw 135 penetrates through the slider 134 and forms a sliding guiding fit with the slider 134.

[0125] The adjusting assembly 13 further includes a second motor 136 and a turntable 138. The second motor 136 is connected to the adapter plate 137. One side surface of the adapter plate 137 close to the scrubbing plate 14 is provided with a turntable 138. One side surface of the turntable 138 is rotatably connected to the adapter plate 137, and an eccentric position on the other side surface is provided with a connecting rod 139. A limiting groove 1371 is formed on one side surface of the adapter plate 137 close to the scrubbing plate 14. A limiting block 141 is installed on the side surface of the scrubbing plate 14. The limiting block 141 is arranged inside the limiting groove 1371 and forms a sliding guiding fit with the limiting groove 1371. The cross-sections of the limiting block 141 and the limiting groove 1371 are both T-shaped. One end of the connecting rod 139 is rotatably connected to the eccentric position of the turntable 138, and the other end is rotatably connected to the limiting block 141.

[0126] The flushing assembly 3 includes a spray head 31, a water delivery pipe 32 and a pump body 33. The spray head 31 is installed at the inner top of the mixing tank 1 and is located above the crushing assembly 2. The spray head 31 corresponds to the gap between the two groups of scrubbing plates 14. One end of the water delivery pipe 32 is connected to the spray head 31, and the other end is located in the solution. The pump body 33 is connected to the water delivery pipe 32. Filter meshes 142 are installed on the outer walls of the two groups of scrubbing plates 14.

[0127] The crushing assembly 2 further includes a roller shaft 21, a kneading belt 22 sleeved on the roller shaft 21, a kneading motor 23 for driving the rotation of the roller shaft 21, and a housing 24. Both ends of the roller shaft 21 are rotatably connected to the inner wall of the housing 24. The kneading motor 23 is installed on the outer wall of the mixing tank 1. The output shaft of the kneading motor 23 penetrates through the mixing tank 1 and the housing 24 and is connected to one end of the roller shaft 21. There are two groups of kneading belts 22 and kneading motors 23. The two groups of kneading belts 22 are both arranged vertically and are parallel to each other. The two groups of kneading motors 23 drive the two kneading belts 22 to rotate in opposite directions and at different speeds.

[0128] During the use of the mixing device of the present invention, first, a variety of raw materials required for preparation are fed into the mixing tank 1 from the feed port. Subsequently, the stirring motor 111 drives the stirring rod 112 at the bottom of the mixing tank 1 to rotate. The rotation of the stirring rod 112 drives the mixing of a variety of raw materials in the mixing tank 1, and various materials are mixed. Due to the relatively large viscosity of the solvent, many agglomerates of different sizes will be generated during the stirring process. The agglomerates include agglomerates of powdery materials and solvents, and also include agglomerates of powdery materials, solid particles and solvents.

[0129] During the stirring process, the initial state of the rubbing plates 14 is submerged in the solution in the mixing tank 1, and the two groups of rubbing plates 14 are separated from each other;

[0130] After stirring for a period of time, the agglomerated materials are started to be crushed. The specific process is as follows:

[0131] The first motor 131 drives the bidirectional lead screw 135 to rotate, and drives the two groups of sliders 134 and the corresponding two groups of rubbing plates 14 to approach each other. Since the rubbing plates 14 are submerged in the solution, when the two groups of rubbing plates 14 approach each other and reach a preset distance, the movement pauses. This preset distance is the same as the diameter of the solid particles. During this process, the two groups of rubbing plates 14 can squeeze the agglomerated materials, flatten and clamp the agglomerates located between them. It should be noted that: the agglomerated materials clamped at this time include larger powder agglomerates and agglomerates of powder, solid particles and solvents mixed together. Since the sizes and shapes of the input solid particle raw materials are relatively consistent, after the rubbing plates 14 pause, the gap between the two groups of rubbing plates 14 is the same as the diameter of the solid particles, avoiding the phenomenon of crushing the solid particles during the clamping process.

[0132] It should be added that both the first motor 131 and the second motor 136 are underwater motors, and waterproof sealing shells are provided outside both the first motor 131 and the second motor 136. Therefore, when the rubbing plates 14 are located in the solution, the first motor 131 and the second motor 136 can also work normally.

[0133] Subsequently, the output shaft of the driving motor 121 drives the bracket 122 to rotate upward by ninety degrees in the mixing tank 1, and drives the two groups of rubbing plates 14 in a clamping state to rotate out of the mixed material and move to the top of the kneading belt 22. Subsequently, the output shaft of the second motor 136 drives the turntable 138 to rotate, and the rotation of the turntable 138 drives the connecting rod 139 in the eccentric position to move, driving the limit block 141 to move in the limit groove 1371. The movement of the limit block 141 drives the rubbing plate 14 to move along the length direction of the fixed plate, and the second motor 136 is also provided with two groups, corresponding to the two groups of rubbing plates 14, and the two groups of second motors The machine 136 drives the two groups of washboards 14 to move in an interlaced manner, and utilizes the interlaced movement of the two groups of washboards 14 to rub the agglomerated materials between the two groups. The pump body 33 filters out the agglomerated materials with the solvent at the bottom and delivers them to the nozzle 31 through the water pipe 32, and sprays the liquid through the nozzle 31. The sprayed liquid is directed toward the gap between the two groups of washboards 14. In conjunction with the rubbing of the two groups of washboards 14, on the one hand, for the agglomerates without solid particles, in the process of continuous rubbing and impact, the agglomerated materials are rubbed and washed away, and part of the dispersed part will adhere to the washboard, and part will be washed away and fall back into the mixed solution;

[0134] On the other hand, for the agglomerates containing solid particles, external force is applied to the powder agglomerates bonded to the surface of the solid particles during rubbing from different directions, and the solvent impact is combined to achieve the powder agglomeration of the powder on the surface of the solid particles. Part of the separated powder agglomerates will be bonded to the rubbing board, and part will be washed away and fall back into the mixed solution;

[0135] It should be noted that, under the impact force of the solvent, solid particles may be impacted and separated from the rubbing plate 14, but through the setting of the filter 142, although some solid particles are washed down, they will be blocked by the filter 142, thus preventing the solid particles from entering between the two sets of rubbing belts 22;

[0136] It should be noted that when the washboards 14 are located in the solution, the two groups of washboards 14 are in a horizontal state parallel to each other, and the filter screen 142 is located on one side of the washboards 14. After a ninety-degree rotation, the horizontal washboards 14 rotate from a horizontal state to a vertical state, and the filter screen 142 is located at the bottom of the washboards 14.

[0137] Under the solvent impact and gravity, when the separated dough mass falls between the two sets of kneading belts 22, when the output shaft of the kneading motor 23 drives the roller shaft 21 to rotate, since the two sets of kneading are respectively connected to the two sets of kneading motors 23, driven by the two sets of kneading motors 23, the two sets of kneading belts 22 rotate in opposite directions and at different speeds. When the dough mass falls between the two sets of kneading belts 22, due to the small distance between the two sets of kneading belts 22, the dough mass entering between them is crushed by the speed difference between the two sets of kneading belts 22. The crushed dough mass enters the solution again under the drive of the two sets of kneading plates 14. And, a scraper is provided at the bottom of the kneading belt 22, and the dough mass adhered to the kneading belt 22 can be scraped off by the scraper to prevent the dough mass from adhering to the kneading belt 22 for a long time;

[0138] It should be supplemented and explained that the top of the kneading belt 22 extends out of the solution, the middle part and the top are immersed in the solution. The dough mass initially falls on the top of the kneading belt 22, and as the kneading belt 22 rotates, the dough mass is gradually brought into the solution, and the dough mass is crushed in the solution. Under the influence of the solution, the dough mass will not adhere to the kneading belt 22. And a heating device can be provided on the mixing tank 1, and the heating device can be a heating wire or the like for heating the raw materials.

[0139] Finally, the drive motor 121 drives the bracket 122 to rotate back by ninety degrees, driving the two sets of rubbing plates 14 to be immersed in the solution again. The drive motor 121 pauses, and the first motor 131 drives the bidirectional lead screw 135 to rotate back, separating the two sets of rubbing plates 14 from each other in the solution. Since the solution is stirred by the stirring rod 112, the solution flows in the mixing tank 1, and the solid particles on the rubbing plates 14 can be washed down, so that the solid particles are mixed into the solution. Subsequently, after the rubbing plates 14 are stationary in the solution for a period of time, the first motor 131 drives the two sets of rubbing plates 14 to approach each other again and clamp the agglomerates located on them. After clamping, the drive motor 121 drives the bracket 122 to rotate ninety degrees and move above the kneading belt 22, and so on in sequence.

[0140] The above describes the embodiments of this example, but this example is not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this example, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this example.

Claims

1. A preparation method of a hydrophobic, oleophobic and anti-graffiti nano-coating, characterized in that, The steps include: S1: Preparation of component A Adding an alkoxy-containing polysiloxane intermediate, a hydrophobic nano-silica filler, a methoxysilyl-terminated polyether, a hydroxyl-containing dimethylsiloxane, and a titanate catalyst into a mixing device, stirring and mixing them thoroughly, and discharging the material to obtain a modified alkoxy-containing silicon polymer, which is recorded as component A; S2: Preparation of component B Add the coupling agent and isoparaffin diluent to component A, stir for 3-5 minutes, pour into a clean and dry jar with a heating device, seal it, heat the outer periphery of the jar to 30-40°C, react for more than 48 hours, let it stand at room temperature, then discharge the material to obtain component B solution; S3: Preparation of finished materials Add the polyether modified polydimethylsiloxane copolymer defoamer, strong gel catalyst, hindered amine light stabilizer, and component B solution, stir at 300-500 rpm for 3-5 minutes, and then discharge the material. After discharge, seal and store it. The mixing device comprises a mixing tank, in which a stirring assembly for stirring the solution, two groups of washboards, a transfer assembly and an adjustment assembly are installed, the transfer assembly and the adjustment assembly are both connected to the two groups of washboards, the transfer assembly is used to drive the two groups of washboards to rotate and extend out of the solution, the adjustment assembly is used to drive the two groups of washboards to move relative to each other and to move closer to or farther away from each other, and also comprises a washing assembly and a crushing assembly, the washing assembly is used to wash the agglomerates between the two groups of washboards, and the crushing assembly is used to crush the powder agglomerates washed down by the washing assembly; The stirring assembly includes a stirring rod and a stirring motor. The stirring rod is installed inside the mixing tank and is located below the crushing assembly. The stirring motor is installed at the bottom of the mixing tank. The output shaft of the stirring motor passes through the mixing tank and is connected to the stirring rod. The transfer assembly includes a drive motor and a bracket, wherein the output shaft of the drive motor penetrates and extends into the mixing tank, and one end extending into the mixing tank is connected to one end of the bracket, the length direction of the bracket is perpendicular to the axis of the output shaft of the drive motor, and one end of the bracket away from the output shaft of the drive motor is connected to the washboard; The adjustment component includes a first motor and a fixed rod, the fixed rod is connected to one end of the bracket away from the output shaft of the driving motor, the length direction of the fixed rod is perpendicular to the length direction of the bracket, a connecting plate is installed on one side of the fixed rod, the connecting plate is connected to the rubbing plate, a slider is installed on the side of the connecting plate close to the fixed rod, a slide groove is opened inside the fixed rod, the slide groove and the slider form a sliding guide, the cross-sections of the slider and the slide groove are both rectangular, a bidirectional lead screw is installed in the slide groove, both ends of the bidirectional lead screw are rotatably connected to the inner wall of the slide groove, and the bidirectional lead screw passes through the slider and forms a sliding guide with the slider; The crushing assembly also includes a roller, a kneading belt mounted on the roller, a kneading motor that drives the roller to rotate, and an outer shell. The two ends of the roller are rotatably connected to the inner wall of the outer shell. The kneading motor is installed on the outer wall of the mixing tank. The output shaft of the kneading motor passes through the mixing tank and the outer shell and is connected to one end of the roller. There are two groups of kneading belts and kneading motors. The two groups of kneading belts are arranged vertically and parallel to each other. The two groups of kneading motors drive the two kneading belts to rotate in different directions and at different speeds.

Images