Water-based coating composition and preparation method thereof

Abstract

The invention relates to the technical field of coating mixing, and discloses a water-based coating composition and a preparation method thereof.The preparation method comprises the following specific steps that S1, water, a dispersing agent, a defoaming agent and a preservative are added into a stirring barrel, and the materials are stirred through a stirring rod; s2, when the materials in the step 1 are stirred, a coloring pigment and a coloring material are sequentially added into the materials, and preparation of the slurry is completed; s3, adding the emulsion into the stirring barrel and carrying out stirring treatment; s4, when the materials in the S3 are stirred, a thickening agent, a PH regulator, an anti-freezing agent, a coalescing agent and a defoaming agent are sequentially added into the materials, and preparation of the water-based paint is completed; and S5, adding the slurry and the water-based paint into the stirring barrel to finish the processing of the water-based paint composition. Compared with a single stirring rod, the powder and the water can be uniformly mixed more quickly through forward rotation and reverse rotation alternate stirring, and the preparation time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of coating mixing, in particular to a water-based coating composition and a preparation method thereof. Background Art

[0002] A water-based paint composition is an environmentally friendly paint system with water as the main solvent. It forms a paint with low volatile organic compound (VOC) emissions, safety, ease of use, and diverse performance through the scientific proportion of film-forming substances, pigments, additives, water and other ingredients. It is widely used in many fields such as construction, furniture, and metal to meet the needs of modern green buildings and sustainable development.

[0003] At present, before preparing water-based paint, various powders need to be mixed with water. However, the existing mixing method is to stir them through a stirring rod and a stirring barrel. Since the stirring blades on the surface of the stirring rod are limited and cannot fully contact the entire stirring barrel, the stirring time is prolonged, resulting in low mixing efficiency, which does not meet existing needs. In this regard, we propose a water-based paint composition and a preparation method thereof. Summary of the invention

[0004] The present invention provides a water-based coating composition and a preparation method thereof, which have the beneficial effect of improving mixing efficiency, and solve the problem mentioned in the above background technology that various powders need to be mixed with water before preparing the water-based coating, but the existing mixing method is to stir them by a stirring rod and a stirring barrel. Since the stirring blades on the surface of the stirring rod are limited and cannot fully contact the entire stirring barrel, the stirring time is prolonged, resulting in low mixing efficiency.

[0005] The present invention provides the following technical solution: a water-based coating composition and a preparation method thereof, comprising the following specific steps: S1. Add water, dispersant, defoamer and preservative into a mixing barrel, and stir the materials with a stirring rod; S2, while stirring the materials in step 1, sequentially adding coloring pigments and coloring materials therein, to complete the preparation of the slurry; S3, adding the emulsion into a stirring barrel and stirring; S4, while stirring the materials in S3, sequentially adding a thickener, a pH regulator, an antifreeze agent, a film-forming aid, and a defoaming agent therein, to complete the preparation of the water-based coating; S5. Add the slurry and the water-based coating into a stirring barrel to complete the processing of the water-based coating composition.

[0006] As an optional solution of the water-based coating composition and the preparation method thereof described in the present invention, wherein: the stirring rod in S1 is rotatably installed in the stirring barrel, a driving motor for driving the stirring rod to rotate is installed on the stirring barrel, a pushing plate for turning the coating is rotatably installed in the stirring barrel, a driving structure for driving the pushing plate to rotate is installed in the stirring barrel, a grinding plate for grinding the coating is installed in the stirring barrel, and a rotating belt for crushing particles is rotatably installed on the surface of the grinding plate; The driving structure includes a driving disk coaxially mounted on the surface of the stirring rod, a first tooth segment opened on the side of the driving disk, and a connecting ring block rotatably mounted on the inner wall of the stirring barrel, the inner wall of the connecting ring block is provided with a second tooth segment, and a driven gear rotatably mounted in the stirring barrel, the driven gear is respectively meshed with the first tooth segment and the second tooth segment.

[0007] As an optional scheme of the water-based coating composition and preparation method thereof described in the present invention, wherein: a rotating disk is rotatably installed inside the stirring barrel, the rotating disk is coaxially installed on the surface of the stirring rod, and the connecting ring block is connected to the rotating disk.

[0008] As an optional scheme for a water-based coating composition and a preparation method thereof described in the present invention, wherein: an annular groove is opened on the bottom side of the rotating disk, the cross-sectional shape of the annular groove is set to an inverted convex shape, a sliding block is slidably installed inside the annular groove, a connecting rod is installed in abutment with the sliding block, the connecting rod is connected to the driven gear, a connecting rod is installed on the bottom side of the driven gear, and the connecting rod is rotatably connected to the push plate.

[0009] As an optional solution of the water-based coating composition and the preparation method thereof described in the present invention, wherein: the grinding plate is set as a hollow plate, the first rotating rod, the second rotating rod and the third rotating rod are rotatably installed inside the grinding plate, the rotating belt is rotatably matched on the surfaces of the first rotating rod, the second rotating rod and the third rotating rod, the surface of the stirring rod is coaxially installed with a transmission gear, the surface of the first rotating rod is installed with a driving gear, and the transmission gear is meshed with the driving gear; When the stirring rod rotates, the transmission gear rotates accordingly and drives the first rotating rod to rotate by cooperating with the driving gear. At this time, the rotating belt rotates inside the grinding plate.

[0010] As an optional solution of the water-based coating composition and the preparation method thereof described in the present invention, wherein: the push plate is configured as a filter plate, and elastic blocks are respectively installed on both sides of the push plate; When the stirring rod rotates, the push plate rotates forward and reverse with the stirring rod as the center. Moreover, after each forward and reverse rotation of the stirring rod, the push plate fits with the grinding plate, and the rotating belt rotates at the same time.

[0011] As an optional solution of the water-based coating composition and the preparation method thereof described in the present invention, wherein: a blanking plate is installed inside the stirring barrel, a blanking layer is formed by the arrangement of the blanking plate, a grinding chamber is opened inside the stirring barrel, the grinding chamber is communicated with the blanking layer, a cam is rotatably installed inside the grinding chamber, and the stirring rod is connected to the cam; When the stirring rod rotates, the cam rotates along with the stirring rod, and the side wall of the cam contacts the falling material layer.

[0012] As an optional scheme for a water-based coating composition and a preparation method thereof described in the present invention, wherein: a discharge pipe is installed on the blanking layer, a filter screen is installed at the inlet of the discharge pipe, a guide structure is installed inside the discharge pipe, the guide structure includes an annular block installed on the inner wall of the discharge pipe, and a sealing block arranged on the side of the annular block, and grooves symmetrically opened on the surface of the annular block, a connecting spring is installed inside the groove, the connecting spring is connected to the sealing block, and a through hole is opened on the surface of the sealing block for the stirring rod to pass through, and the through hole is slidably matched with the outer wall of the stirring rod.

[0013] As an optional solution of the water-based coating composition and the preparation method thereof described in the present invention, wherein: the side of the grinding plate is provided with an extrusion groove and an extension groove, the extension groove is communicated with the extrusion groove, a scraper rod for scraping materials is inserted and slidably installed inside the extrusion groove, a return spring is installed between the scraper rod and the extrusion groove, the end of the scraper rod is set as an inclined surface, and a pressing rod is installed on the side of the push plate; When the grinding plate is fitted with the pushing plate, the pressing rod is inserted into the extending groove, at which time the scraping rod is squeezed and the end portion contacts the rotating belt.

[0014] This solution also proposes a water-based coating composition: the water-based coating composition is prepared by the method for preparing a water-based coating composition according to any one of claims 1 to 9.

[0015] The present invention has the following beneficial effects:

[0016] 1. The water-based coating composition and the preparation method thereof are characterized in that a driving disc and a rotating disc are coaxially arranged on the surface of a stirring rod. During the rotation of the stirring rod, a driven gear successively contacts the driving disc and the rotating disc, and meshes with the first tooth segment and the second tooth segment during the contact process. During the meshing process, the driven gear drives the push plate to flip the coating, thereby enhancing the mixing of water and powder. Moreover, since the positions of the first tooth segment and the second tooth segment meshing with the driven gear are different, the push plate can rotate forward and reverse with the stirring rod as the center. Through alternating forward and reverse stirring, the mixing of powder and water is accelerated, the dispersion of powder in water is improved, and the mixing efficiency is improved. Compared with a single stirring rod, alternating forward and reverse stirring can achieve uniform mixing of powder and water more quickly and shorten the preparation time.

[0017] 2. The water-based coating composition and the preparation method thereof, through the cooperation of the first rotating rod, the second rotating rod and the rotating belt, the rotating belt rotates on the surface of the grinding plate while the stirring rod rotates, and at the same time, during the rotation of the stirring rod, the cooperation of the first tooth segment and the second tooth segment is used to make the push plate fit with the grinding plate during each forward or reverse rotation. During the fitting, the rotating belt rotates and crushes the powder agglomerates attached to the surface of the push plate, so that the powder agglomerates are broken up into the water. The rotation of the stirring rod can not only mix the coating, but also automatically break up the powder agglomerates during the mixing process, without the need for an additional power source; Moreover, by installing elastic blocks on both sides of the push plate, when the push plate contacts the grinding plate, the elastic blocks are squeezed during the rotation of the rotating belt. Therefore, the powder agglomerates attached to the surface of the push plate are in closer contact with the rotating belt. When the rotating belt rotates, the squeezing effect of the elastic blocks makes the rotating belt and the powder agglomerates in closer contact, thereby increasing the crushing force and making it easier to break up the powder agglomerates.

[0018] 3. The water-based coating composition and the preparation method thereof, through the cooperation of the blanking plate, the grinding chamber and the cam, during the rotation of the stirring rod, the particles are affected by the stirring force and will be thrown to the edge of the stirring barrel, and under the influence of their own gravity, the particles will fall into the blanking layer to achieve the collection of the particles. At the same time, the stirring rod rotates and drives the cam to rotate to grind the particles, so that the particles are crushed; no additional power source is required, and the collection and grinding of the particles can be achieved through the rotation of the stirring rod, which saves energy and further enhances the preparation effect of the coating.

[0019] 4. The water-based coating composition and the preparation method thereof, through the cooperation of the scraper rod and the pressing rod, when the grinding plate and the pushing plate are fitted, the pressing rod is inserted into the extension groove, and the pressing rod resists the end of the scraper rod, so that the end of the scraper rod contacts the rotating belt during the movement. Therefore, during the rotation of the rotating belt, the scraper rod can scrape off the powder lumps on the surface of the rotating belt, so that the powder lumps are mixed in the water; not only that, through the setting of the reset spring, when the pushing plate is away from the grinding plate, the pressing rod no longer resists the scraper rod, so the reset spring drives the scraper rod to reset, so that the scraper rod loses contact with the rotating belt, and when the rotating belt is not needed, the scraper rod is away, reducing unnecessary wear of the scraper rod and the rotating belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the stirring barrel of the present invention.

[0021] Figure 2 It is a schematic diagram of the internal cross-section structure of the stirring barrel of the present invention.

[0022] Figure 3 It is a schematic diagram of the matching structure of the driven gear, the driving plate and the connecting ring block of the present invention.

[0023] Figure 4 It is a schematic diagram of the fitting structure of the rotating belt and the elastic block of the present invention.

[0024] Figure 5 It is a schematic diagram of the matching structure of the driven gear, the first tooth segment and the second tooth segment of the present invention.

[0025] Figure 6 For the present invention Figure 2 Schematic diagram of the enlarged structure at A in the figure.

[0026] Figure 7 For the present invention Figure 2 Schematic diagram of the enlarged structure at B in the figure.

[0027] Figure 8 For the present invention Figure 4 Schematic diagram of the enlarged structure at C in the figure.

[0028] Fig. 9 It is a schematic diagram of the structure of the present invention viewed from above.

[0029] In the figure: 110, stirring barrel; 111, stirring rod; 112, driving motor; 113, pushing plate; 124, second tooth segment; 125, driven gear; 130, grinding plate; 131, rotating belt; 140, rotating disk; 141, annular groove; 142, sliding block; 143, connecting rod; 144, connecting rod; 150, first rotating rod; 151, second rotating rod; 152, transmission gear; 153, driving gear; 154, third rotating rod; 160, elastic block; 170 , blanking layer; 171, blanking plate; 172, grinding chamber; 173, cam; 180, guide structure; 181, annular block; 182, sealing block; 183, groove; 184, connecting spring; 185, through-hole; 190, filter screen; 191, discharge pipe; 210, connecting ring block; 220, first tooth segment; 230, driving structure; 240, driving disk; 250, pressing rod; 251, extrusion groove; 252, extension groove; 253, reset spring; 254, scraper rod. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1: This embodiment is intended to promote the solution of the problem that various powders and water need to be mixed before preparing water-based coatings. However, the existing mixing method is to stir them by a stirring rod and a stirring barrel. Since the stirring blades on the surface of the stirring rod are limited and cannot fully contact the entire stirring barrel, the stirring time is prolonged, resulting in low mixing efficiency. Please refer to Figure 1 - Fig. 9 , a water-based coating composition and a preparation method thereof, comprising the following specific steps: S1, adding water, dispersant, defoamer and preservative into the stirring barrel 110, and stirring the materials by the stirring rod 111; S2, while stirring the materials in step 1, sequentially adding coloring pigments and coloring materials therein, to complete the preparation of the slurry; S3, adding the emulsion into the stirring barrel 110 and stirring; S4, while stirring the materials in S3, sequentially adding a thickener, a pH regulator, an antifreeze agent, a film-forming aid, and a defoaming agent therein, to complete the preparation of the water-based coating; S5. Add the slurry and the water-based coating into the stirring barrel 110 to complete the processing of the water-based coating composition.

[0032] For specific implementation, see Figure 1 and Figure 2 The stirring rod 111 in S1 is rotatably installed in the stirring barrel 110, and a driving motor for driving the stirring rod 111 to rotate is installed on the stirring barrel 110. The stirring rod 111 is driven to rotate by the operation of the driving motor 112, so that the stirring rod 111 mixes the materials. A pushing plate 113 for turning the paint is rotatably installed in the stirring barrel 110, and a driving structure 230 for driving the pushing plate 113 to rotate is installed in the stirring barrel 110. A grinding plate 130 for grinding the paint is installed in the stirring barrel 110, and a rotating belt 131 for crushing particles is rotatably installed on the surface of the grinding plate 130; In specific implementation, the driving structure 230 includes a driving disk 240 coaxially installed on the surface of the stirring rod 111, and a first tooth segment 220 opened on the side of the driving disk 240, and a connecting ring block 210 rotatably installed on the inner wall of the stirring barrel 110, the inner wall of the connecting ring block 210 is provided with a second tooth segment 124, and a driven gear 125 rotatably installed in the stirring barrel 110, and the driven gear 125 is respectively engaged with the first tooth segment 220 and the second tooth segment 124.

[0033] In a specific implementation, two groups of driven gears 125 , grinding plates 130 and pushing plates 113 are provided.

[0034] See Figure 2 , Figure 3 and Figure 5 The stirring rod 111 rotates to drive the driving disk 240. During the rotation of the driving disk 240, the first tooth segment 220 is engaged with the driven gear 125 to rotate the push plate 113. During the rotation, the paint is turned over, thereby enhancing the mixing effect of the powder and water.

[0035] In specific implementation, a rotating disk 140 is rotatably installed inside the mixing barrel 110, and the rotating disk 140 is coaxially installed on the surface of the mixing rod 111. The connecting ring block 210 is connected to the rotating disk 140. An annular groove 141 is opened on the bottom side of the rotating disk 140, and the cross-sectional shape of the annular groove 141 is set to an inverted convex shape. Figure 2 A sliding block 142 is slidably installed inside the annular groove 141, and a connecting rod 143 is installed in contact with the sliding block 142. The connecting rod 143 is connected to the driven gear 125. Through the cooperation of the annular groove 141 and the sliding block 142, the rotation trajectory of the driven gear 125 is guided. A connecting rod 144 is installed on the bottom side of the driven gear 125, and the connecting rod 144 rotates with the push plate 113.

[0036] During the rotation of the stirring rod 111, the rotating disk 140 and the driving disk 240 are driven to rotate simultaneously. During the rotation, the driven gear 125 meshes with the first tooth segment 220 and the second tooth segment 124 successively. Since the positions where the first tooth segment 220 and the second tooth segment 124 mesh with the driven gear 125 are different, the driven gear 125 drives the push plate 113 to rotate forward and reversely with the stirring rod 111 as the center. Through the alternating stirring of forward and reverse rotation, the mixing of powder and water is accelerated, the dispersibility of the powder in water is improved, and the mixing efficiency is improved at the same time.

[0037] In this embodiment: the driving disk 240 and the rotating disk 140 are coaxially arranged on the surface of the stirring rod 111. During the rotation of the stirring rod 111, the driven gear 125 contacts the driving disk 240 and the rotating disk 140 successively, and engages with the first tooth segment 220 and the second tooth segment 124 during the contact process. During the engagement process, the driven gear 125 drives the pushing plate 113 to flip the paint, thereby enhancing the mixing of water and powder.

[0038] Moreover, since the positions where the first tooth segment 220 and the second tooth segment 124 mesh with the driven gear 125 are different, the push plate 113 rotates forward and reverse with the stirring rod 111 as the center. By stirring alternately by forward and reverse rotation, the mixing of powder and water is accelerated, the dispersion of powder in water is improved, and the mixing efficiency is improved. Compared with a single stirring rod 111, alternating by forward and reverse rotation can achieve uniform mixing of powder and water more quickly and shorten the preparation time.

[0039] Example 2: This example is intended to promote the solution of the problem that various powders need to be mixed with water before preparing water-based coatings. However, during the mixing process, powder agglomeration is inevitable. If powder agglomeration occurs, it may lead to poor coating dispersion, coating defects, poor stability, performance degradation, poor leveling and low preparation efficiency. This example is an improvement made on the basis of Example 1. For details, please refer to Figure 1 - Fig. 9 The grinding plate 130 is configured as a hollow plate, and the first rotating rod 150, the second rotating rod 151 and the third rotating rod 153 are rotatably installed inside the grinding plate 130. The rotating belt 131 is rotatably engaged with the surfaces of the first rotating rod 150, the second rotating rod 151 and the third rotating rod 153. A transmission gear 152 is coaxially installed on the surface of the stirring rod 111, and a driving gear 153 is installed on the surface of the first rotating rod 150, and the transmission gear 152 is meshed with the driving gear 153.

[0040] See Figure 4 The pushing plate 113 is configured as a filter plate, so that when the pushing plate 113 turns over the paint, the mixed paint can pass through the surface of the pushing plate 113, but the paint with powder agglomerates will adhere to the surface of the pushing plate 113, and elastic blocks 160 are respectively installed on both sides of the pushing plate 113. Since the elastic blocks 160 have certain protrusions, when the pushing plate 113 is in contact with the grinding plate 130, the rotating belt 131 will roll over the pushing plate 113, so that in the process of rolling the powder agglomerates, the rolling force is increased, so that the powder agglomerates are more easily broken up.

[0041] When the stirring rod 111 rotates, the push plate 113 rotates forward and reverse with the stirring rod 111 as the center, as shown in the figure. Moreover, after each forward and reverse rotation of the stirring rod 111, the push plate 113 fits against the grinding plate 130, and the rotating belt 131 rotates at the same time.

[0042] During specific implementation, when the stirring rod 111 rotates, the transmission gear 152 rotates accordingly, and utilizes the cooperation of the driving gear 153 to drive the first rotating rod 150 to rotate. At this time, the rotating belt 131 rotates inside the grinding plate 130. At the same time, during the rotation of the stirring rod 111, the driving structure 230 is utilized to make the push plate 113 fit with the grinding plate 130 during each forward or reverse rotation. During the fitting, the rotating belt 131 rotates to crush the powder clumps attached to the surface of the push plate 113, so that the powder clumps are broken up into the water.

[0043] In this embodiment: through the cooperation of the first rotating rod 150, the second rotating rod 151 and the rotating belt 131, the rotating belt 131 rotates on the surface of the grinding plate 130 while the stirring rod 111 rotates. At the same time, during the rotation of the stirring rod 111, the first tooth segment 220 and the second tooth segment 124 are used to make the push plate 113 fit with the grinding plate 130 during each forward or reverse rotation. During the fit, the rotating belt 131 rotates and crushes the powder agglomerates attached to the surface of the push plate 113, so that the powder agglomerates are broken up into the water. The rotation of the stirring rod 111 can not only mix the coating, but also automatically break up the powder agglomerates during the mixing process without the need for an additional power source. Furthermore, by installing the elastic blocks 160 on both sides of the pushing plate 113, when the pushing plate 113 contacts the grinding plate 130, the elastic blocks 160 are squeezed during the rotation of the rotating belt 131, so the powder agglomerates attached to the surface of the pushing plate 113 are in closer contact with the rotating belt 131. When the rotating belt 131 rotates, the squeezing effect of the elastic blocks 160 makes the rotating belt 131 in closer contact with the powder agglomerates, thereby increasing the crushing force and making it easier to break up the powder agglomerates.

[0044] Embodiment 3: This embodiment is intended to promote the solution of the problem that before preparing water-based coatings, various powders need to be ground from solid state into powder state, but some particles will inevitably exist in the grinding process, thus affecting the preparation of water-based coatings. This embodiment is an improvement made on the basis of Embodiment 2. For details, please refer to Figure 1 - Fig. 9 A blanking plate 171 is installed inside the mixing barrel 110, and a blanking layer 170 is formed by the arrangement of the blanking plate 171. A grinding chamber 172 is opened inside the mixing barrel 110, and the grinding chamber 172 is communicated with the blanking layer 170. A cam 173 is rotatably installed inside the grinding chamber 172, and the stirring rod 111 is connected to the cam 173; See Figure 2 and Figure 7When the stirring rod 111 rotates, the cam 173 rotates along with the stirring rod 111 , and the side wall of the cam 173 contacts the falling material layer 170 .

[0045] Since the particles have a large density, they usually float on the bottom side of the paint. During the rotation of the stirring rod 111, the particles are affected by the stirring force and will be thrown to the edge of the stirring barrel 110. Under the influence of their own gravity, the particles will fall into the falling layer 170. Since the falling layer 170 is an arc surface, the particles fall into the grinding chamber 172. When the stirring rod 111 rotates, the cam 173 is driven to rotate to grind the particles. Through the cooperation of the stirring rod 111 and the cam 173, the dispersion effect of the particles is significantly enhanced, thereby improving the quality of the paint.

[0046] See Figure 2 and Figure 7 A discharge pipe 191 is installed on the material dropping layer 170, and a filter screen 190 is installed at the inlet of the discharge pipe 191 to minimize the outflow of collected particles from the discharge pipe 191. A guide structure 180 is installed inside the discharge pipe 191. The guide structure 180 includes an annular block 181 installed on the inner wall of the discharge pipe 191, a sealing block 182 arranged on the side of the annular block 181, and a groove 183 symmetrically opened on the surface of the annular block 181. A connecting spring 184 is installed inside the groove 183. The connecting spring 184 is set as a tension spring. The connecting spring 184 is connected to the sealing block 182, so that the paint inside the mixing barrel 110 will not enter from the inside of the discharge pipe 191, but the ground paint can flow out from the discharge pipe 191. A through hole 185 for the stirring rod 111 to pass through is opened on the surface of the sealing block 182. The through hole 185 is slidably matched with the outer wall of the stirring rod 111. In this embodiment: through the cooperation of the blanking plate 171, the grinding chamber 172 and the cam 173, during the rotation of the stirring rod 111, the particles are affected by the stirring force and will be thrown to the edge of the stirring barrel 110, and under the influence of their own gravity, the particles will fall into the blanking layer 170 to achieve the collection of the particles. At the same time, the stirring rod 111 rotates and drives the cam 173 to rotate to grind the particles, so that the particles are crushed; no additional power source is required, and the collection and grinding of the particles can be achieved through the rotation of the stirring rod 111, which saves energy and further enhances the preparation effect of the coating.

[0047] Embodiment 4: This embodiment is intended to promote the solution of the problem that after the rotating belt crushes the powder balls on the surface of the push plate, some of the powder balls may remain on the surface of the rotating belt. This embodiment is an improvement made on the basis of embodiment 3. For details, please refer to Figure 1 - Fig. 9An extrusion groove 251 and an extension groove 252 are provided on the side of the grinding plate 130. The extension groove 252 is communicated with the extrusion groove 251. A scraper rod 254 for scraping materials is slidably installed inside the extrusion groove 251. A return spring 253 is installed between the scraper rod 254 and the extrusion groove 251. The end of the scraper rod 254 is set as an inclined surface. A pressing rod 250 is installed on the side of the push plate 113.

[0048] See Figure 8 In specific implementation, when the grinding plate 130 is in contact with the pushing plate 113, the pressing rod 250 is inserted into the extending groove 252, and the scraper rod 254 is squeezed and extended, so that the end of the scraper rod 254 contacts the rotating belt 131. During the rotation of the rotating belt 131, the scraper rod 254 scrapes off the powder lumps remaining on the surface of the rotating belt 131, thereby realizing automatic cleaning of the rotating belt 131 and improving the mixing efficiency; not only that, when the grinding plate 130 loses contact with the pushing plate 113, the pressing rod 250 no longer resists the scraper rod 254. At this time, the scraper rod 254 is reset by the elastic force of the reset spring 253, so the scraper rod 254 loses contact with the rotating belt 131. After the scraper rod 254 is reset by the reset spring 253, it loses contact with the rotating belt 131, reducing unnecessary wear between the scraper rod 254 and the rotating belt 131.

[0049] In this embodiment: through the cooperation of the scraper rod 254 and the pressing rod 250, when the grinding plate 130 is fitted with the pushing plate 113, the pressing rod 250 is inserted into the extension groove 252, and the pressing rod 250 resists the end of the scraper rod 254, so that the end of the scraper rod 254 contacts the rotating belt 131 during the movement. Therefore, during the rotation of the rotating belt 131, the scraper rod 254 can scrape off the powder balls on the surface of the rotating belt 131, so that the powder balls are mixed in the water; not only that, through the setting of the reset spring 253, when the pushing plate 113 moves away from the grinding plate 130, the pressing rod 250 no longer resists the scraper rod 254, so the reset spring 253 drives the scraper rod 254 to reset, so that the scraper rod 254 loses contact with the rotating belt 131, and when the rotating belt 131 is not needed, the scraper rod 254 moves away, reducing unnecessary wear between the scraper rod 254 and the rotating belt 131.

[0050] Embodiment 5: This embodiment further provides a water-based coating composition, which is prepared by any one of the water-based coating composition preparation methods in Embodiments 1 to 4.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a water-based coating composition, characterized in that: The specific steps include: S1, adding water, dispersant, defoamer and preservative into a stirring barrel (110), and stirring the materials by a stirring rod (111); S2, while stirring the materials in step 1, sequentially adding coloring pigments and coloring materials therein, to complete the preparation of the slurry; S3, adding the emulsion into the stirring barrel (110) and stirring the emulsion; S4, while stirring the materials in S3, sequentially adding a thickener, a pH regulator, an antifreeze agent, a film-forming aid, and a defoaming agent therein, to complete the preparation of the water-based coating; S5. Add the slurry and the water-based coating into the stirring barrel (110), thereby completing the processing of the water-based coating composition.

2. The method for preparing an aqueous coating composition according to claim 1, characterized in that: The stirring rod (111) in S1 is rotatably mounted in the stirring barrel (110); a driving motor (112) for driving the stirring rod (111) to rotate is mounted on the stirring barrel (110); a pushing plate (113) for turning the paint is rotatably mounted in the stirring barrel (110); a driving structure (230) for driving the pushing plate (113) to rotate is mounted in the stirring barrel (110); a grinding plate (130) for grinding the paint is mounted in the stirring barrel (110); a rotating belt (131) for crushing particles is rotatably mounted on the surface of the grinding plate (130); The driving structure (230) comprises a driving disc (240) coaxially mounted on the surface of the stirring rod (111), a first tooth segment (220) provided on the side of the driving disc (240), a connecting ring block (210) rotatably mounted on the inner wall of the stirring barrel (110), a second tooth segment (124) provided on the inner wall of the connecting ring block (210), and a driven gear (125) rotatably mounted in the stirring barrel (110), the driven gear (125) meshing with the first tooth segment (220) and the second tooth segment (124) respectively.

3. A method for preparing an aqueous coating composition according to claim 2, characterized in that: A rotating disk (140) is rotatably mounted inside the stirring barrel (110); the rotating disk (140) is coaxially mounted on the surface of the stirring rod (111); and the connecting ring block (210) is connected to the rotating disk (140).

4. A method for preparing an aqueous coating composition according to claim 3, characterized in that: An annular groove (141) is provided on the bottom side of the rotating disk (140). The cross-sectional shape of the annular groove (141) is set to be an inverted convex shape. A sliding block (142) is slidably installed inside the annular groove (141). A connecting rod (143) is installed in contact with the sliding block (142). The connecting rod (143) is connected to the driven gear (125). A connecting rod (144) is installed on the bottom side of the driven gear (125). The connecting rod (144) is rotatably connected to the push plate (113).

5. The method for preparing an aqueous coating composition according to claim 2, characterized in that: The grinding plate (130) is configured as a hollow plate, a first rotating rod (150), a second rotating rod (151) and a third rotating rod (153) are rotatably mounted inside the grinding plate (130), the rotating belt (131) is rotatably engaged with the surfaces of the first rotating rod (150), the second rotating rod (151) and the third rotating rod (153), a transmission gear (152) is coaxially mounted on the surface of the stirring rod (111), a driving gear (153) is mounted on the surface of the first rotating rod (150), and the transmission gear (152) is meshed with the driving gear (153); When the stirring rod (111) rotates, the transmission gear (152) rotates accordingly and drives the first rotating rod (150) to rotate by cooperating with the driving gear (153). At this time, the rotating belt (131) rotates inside the grinding plate (130).

6. The method for preparing an aqueous coating composition according to claim 2, characterized in that: The push plate (113) is configured as a filter plate, and elastic blocks (160) are respectively installed on both sides of the push plate (113); When the stirring rod (111) rotates, the push plate (113) rotates forward and reverse with the stirring rod (111) as the center. Moreover, after each forward and reverse rotation of the stirring rod (111), the push plate (113) is in contact with the grinding plate (130), and the rotating belt (131) rotates at the same time.

7. The method for preparing an aqueous coating composition according to claim 2, characterized in that: A blanking plate (171) is installed inside the mixing barrel (110), and a blanking layer (170) is formed by the arrangement of the blanking plate (171). A grinding chamber (172) is provided inside the mixing barrel (110), and the grinding chamber (172) is communicated with the blanking layer (170). A cam (173) is rotatably installed inside the grinding chamber (172), and the mixing rod (111) is connected to the cam (173); When the stirring rod (111) rotates, the cam (173) rotates following the stirring rod (111), and a side wall of the cam (173) contacts the falling material layer (170).

8. The method for preparing an aqueous coating composition according to claim 7, characterized in that: A discharge pipe (191) is installed on the material discharge layer (170), a filter screen (190) is installed at the inlet of the discharge pipe (191), a guide structure (180) is installed inside the discharge pipe (191), the guide structure (180) comprises an annular block (181) installed on the inner wall of the discharge pipe (191), a sealing block (182) arranged on the side of the annular block (181), and a groove (183) symmetrically opened on the surface of the annular block (181), a connecting spring (184) is installed inside the groove (183), the connecting spring (184) is connected to the sealing block (182), and a through hole (185) for the stirring rod (111) to pass through is opened on the surface of the sealing block (182), and the through hole (185) is slidably matched with the outer wall of the stirring rod (111).

9. A method for preparing a water-based coating composition according to claim 8, characterized in that: The grinding plate (130) is provided with an extrusion groove (251) and a protrusion groove (252) on the side thereof, the protrusion groove (252) being in communication with the extrusion groove (251), a scraper rod (254) for scraping materials being inserted and slidably installed inside the extrusion groove (251), a return spring (253) being installed between the scraper rod (254) and the extrusion groove (251), the end of the scraper rod (254) being arranged as an inclined surface, and a pressing rod (250) being installed on the side thereof; When the grinding plate (130) and the pushing plate (113) are in contact, the pressing rod (250) is inserted into the extension groove (252), at which time the scraping rod (254) is squeezed and the end portion contacts the rotating belt (131).

10. A water-based coating composition, characterized in that: The water-based coating composition is prepared by the method for preparing a water-based coating composition according to any one of claims 1 to 9.

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