Modified nano calcium carbonate preparation equipment and preparation process thereof

Abstract

The application relates to the technical field of modified nano calcium carbonate preparation, and discloses a modified nano calcium carbonate preparation device, which comprises an outer shell, a straight-toothed groove is arranged on the inner wall of the outer shell, an inner cutter head is movably sleeved in the inner part of the outer shell, a conical inclined surface is arranged at the top of the inner cavity of the inner cutter head, a linear clamping groove is arranged on the inner wall of the conical inclined surface, meanwhile, a supporting column extending to the bottom of the inner cutter head is movably sleeved in the inner part of the inner cutter head, and a ball is transmissionally connected between the linear clamping groove and the supporting column. The modified nano calcium carbonate preparation device and the preparation process thereof can utilize the centrifugal force generated by the conical inclined surface during rotation to control the flow direction of the flow-through hole on the connecting shaft, and when the device rotates at low speed or does not rotate, the airflow can be guided to the top end of the inner cutter head to clean the residual powdery nano calcium carbonate.

Description

TECHNICAL FIELD

[0001] The application relates to the preparation technology of modified nano calcium carbonate, in particular to a preparation device and a preparation process of modified nano calcium carbonate. BACKGROUND

[0002] In the sealant industry of silicone, nano calcium carbonate has become an important filling material, which has a significant reinforcing effect on silicone, not only endowing the sealant with excellent thixotropy, but also enabling the sealant to replace a considerable part of more expensive nano silicon dioxide material.

[0003] However, untreated nano calcium carbonate is difficult to disperse in the composite material due to the small size, the adsorption force between particles and the gravity, the hydrophilic and oleophobic surface and the poor compatibility with polymers, which not only seriously affects the appearance of the product, but also easily causes defects in the material, resulting in an ideal reinforcing effect on the processing of the sealant, so that the surface of the nano calcium carbonate needs to be modified.

[0004] In the process of modifying the surface of nano calcium carbonate, the last step is to cool, filter, dry and crush the modified nano calcium carbonate slurry to obtain the surface modified nano calcium carbonate product, and the surface modified nano calcium carbonate is usually crushed by a vortex pulverizer.

[0005] However, the existing vortex pulverizer is difficult to clean the powder-like nano calcium carbonate adhered to the cutter head due to the setting of the internal tooth disc structure, and the cleaning difficulty is large, and the scaling phenomenon is easy to occur on the cutter head when contacting with the water vapor in the air, which not only affects the working efficiency of the vortex pulverizer, but also easily pollutes the next batch of nano calcium carbonate with the operation of the vortex pulverizer, and the stability and reliability are poor.

[0006] Therefore, a vortex pulverizer for preparing surface modified nano calcium carbonate is needed to solve the above-mentioned defects of the existing vortex pulverizer in actual use. SUMMARY

[0007] The application provides a modified nano calcium carbonate preparation device and a preparation process thereof, which has the advantages that the inside cutter head can be automatically cleaned after the operation of the eddy current crusher, so that the powdered nano calcium carbonate is prevented from adhering to the cutter head and causing fouling, the powdered nano calcium carbonate adhering to the cutter head of the eddy current crusher is difficult to be completely discharged due to the arrangement of the internal gear disc structure, the cleaning difficulty is high, and the cutter head is easily fouled when contacting with the water vapor in the air, which affects the working efficiency of the eddy current crusher and easily causes pollution to the next batch of surface modified nano calcium carbonate.

[0008] To achieve the above object, the application adopts the following technical scheme: a modified nano calcium carbonate preparation device, comprising an outer shell, wherein a straight-toothed groove is arranged on the inner wall of the outer shell, an inner cutter head is movably sleeved in the inner shell, the bottom end of the inner cutter head extends to the bottom of the outer shell, a transmission wheel is fixedly installed on the bottom of the outer surface of the inner cutter head, the transmission wheel is in transmission connection with an external power equipment, a conical slope is arranged on the top of the inner cavity of the inner cutter head, a linear clamping groove is arranged on the inner wall of the conical slope, a support column extending to the bottom of the inner cutter head is movably sleeved in the inner cutter head, a ball is in transmission connection between the inner wall of the linear clamping groove and the support column, and a connecting shaft is movably sleeved in the support column.

[0009] In the initial state, the other end of the flow-through hole is in communication with the upper chamber of the support column, and with the operation of the eddy current crusher, the inner cutter head rotates at high speed and drives the support column to move upward, and the other end of the flow-through hole is in communication with the lower chamber of the support column through the gasket.

[0010] The connecting shaft is in elastic connection between the elastic member movably sleeved on the top of the outer surface thereof and the support column.

[0011] Further, the top end of the support column is provided with a first flow guide cover, and a second flow guide cover is fixedly installed on the top of the outer surface of the connecting shaft, and a gap is formed between the first flow guide cover and the second flow guide cover to form a flow guide channel.

[0012] Further, an electric heating wire is arranged on the inner wall of the flow-through hole of the connecting shaft and in contact with the gas flowing therethrough.

[0013] Further, the inside of the bottom end of the support column is provided with a second conductive ring, and the bottom of the outer surface of the connecting shaft is provided with a first conductive ring, and at the beginning, the first conductive ring is located above the second conductive ring, and at the same time, the first conductive ring, the second conductive ring and the electric heating wire on the flow-through hole form a conductive communication loop.

[0014] A preparation process of a modified nano calcium carbonate preparation equipment, comprising the following preparation process:

[0015] S1, the nano calcium carbonate slurry is added to the reaction kettle, heated and stirred to obtain a nano calcium carbonate suspension slurry;

[0016] S2, the nano calcium carbonate suspension slurry is added to urea and fatty acid under stirring, and the modification of nano calcium carbonate is completed by continuous stirring;

[0017] S3, the modified nano calcium carbonate slurry is cooled, filtered, dried and crushed to obtain a surface modified nano calcium carbonate product;

[0018] S31, the dried nano calcium carbonate is sent to the inner cavity of the outer shell through the feeding system, and at the same time, the power equipment and the external air pump are started, so that the inner cutter head rotates at high speed;

[0019] S32, the high-speed rotation of the inner cutter head can generate a corresponding centrifugal force on the sphere, and make it move outward, and force the support column to move upward, so that the other end of the flow-through hole is connected with the lower chamber of the support column, and the air is introduced into the inner cavity of the outer shell through the flow guide hose to assist the crushing and grinding of the nano calcium carbonate;

[0020] S33, when the nano calcium carbonate crushing and grinding operation of the vortex crusher is completed, the rotation of the inner cutter head is reduced or stopped, and the support column is forced to move downward under the elastic force of the elastic element, so that it returns to the initial position, and the other end of the flow-through hole is connected with the upper chamber of the support column, and the airflow is introduced into the top end of the inner cutter head to clean the residual powdery nano calcium carbonate.

[0021] The application has the following technical effects:

[0022] The modified nano calcium carbonate preparation equipment and its preparation process provided by the application can control the flow direction of the flow-through hole on the connecting shaft by using the centrifugal force generated by the rotation of the tapered inclined surface, and can introduce air into the inner cavity of the outer shell to assist the crushing and grinding of the nano calcium carbonate when the connecting shaft rotates at high speed, and can introduce airflow into the top end of the inner cutter head to clean the residual powdery nano calcium carbonate when the connecting shaft rotates at low speed or does not rotate, thereby effectively avoiding the problem of adhesion and scaling of the powdery nano calcium carbonate on the inner cutter head. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0024] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a front view of the structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the internal cutter head and its structure according to the present invention;

[0028] Figure 4 This is a schematic diagram of the support column and its structure according to the present invention;

[0029] Figure 5 This is a schematic diagram of the connecting shaft and its structure according to the present invention;

[0030] Figure 6 The structure of this invention Figure 1 Enlarged diagram of point A in the diagram.

[0031] In the figure: 1. Outer shell; 2. Inner blade disc; 3. Conical bevel; 4. Linear groove; 5. Support column; 6. Sphere; 7. Washer; 8. First guide cover; 9. Connecting shaft; 10. Elastic element; 11. Second guide cover; 12. Flow hole; 13. Guide hose; 14. Transmission wheel; 15. First conductive ring; 16. Second conductive ring. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] like Figure 1 , Figure 2As shown, a modified nano calcium carbonate preparation equipment, including the outer surface through bolt fixed installation on the workbench shell 1, and is provided with straight tooth slot on the inner wall of shell 1, the inside of shell 1 is movably sleeved with inner cutter head 2, the bottom end of inner cutter head 2 extends to the bottom of shell 1, and the transmission wheel 14 is fixedly installed on the bottom of the outer surface of inner cutter head 2, and is drivenly connected with the external power equipment through the transmission wheel 14 to drive the inner cutter head 2 to rotate at high speed, such as Figure 3 As shown, the top of the inner cavity of the inner cutter head 2 is provided with a conical slope 3, and a plurality of linear clamping grooves 4 are arranged in the form of ring array on the inner wall of the conical slope 3, and the inner cutter head 2 is movably sleeved with a support column 5 extending to the bottom of the inner cutter head 2, the inner part of the linear clamping groove 4 is provided with a ball 6 drivingly connected between the support column 5, so that the ball 6 on the linear clamping groove 4 moves outward under the action of centrifugal force when the inner cutter head 2 rotates at high speed, and the support column 5 is forced to move upward, and the support column 5 is movably sleeved with a connecting shaft 9, and the bottom of the outer surface of the connecting shaft 9 is fixedly connected with the workbench;

[0034] As shown in Figure 4 The middle part of the inner cavity of the support column 5 is fixedly installed with a gasket 7, and the inner cavity of the support column 5 is divided into two chambers under the action of the gasket 7 and the connecting shaft 9, the lower chamber of the support column 5 is communicated with the inner cavity of the shell 1 through the flow guide hose 13, as shown in Figure 5 The inner part of the connecting shaft 9 is provided with a flow hole 12, one end of the flow hole 12 extends to the bottom of the connecting shaft 9 and is communicated with the outside air pump, and the other end of the flow hole 12 extends to the middle part of the outer surface thereof.

[0035] In the technical solution, at the beginning, the other end of the flow hole 12 is communicated with the upper chamber of the support column 5, and then when the external air pump is triggered, the high-speed airflow can be used to clean the top of the inner cutter head 2, and with the working of the vortex crusher, the inner cutter head 2 rotates at high speed and drives the support column 5 to move upward, the other end of the flow hole 12 penetrates the gasket 7 and is communicated with the lower chamber of the support column 5, and the air is introduced into the inner cavity of the shell 1 through the flow guide hose 13.

[0036] As shown in Figure 1, in this technical solution, the connecting shaft 9 is elastically connected to the support column 5 via an elastic element 10 movably sleeved on the top of its outer surface. The elastic element 10 can exert downward pressure on the support column 5. Thus, when the inner cutter disc 2 rotates at low speed or even does not rotate, the centrifugal force it generates on the ball 6 is insufficient to overcome the elastic force of the elastic element 10, thereby achieving the cleaning operation of residual nano-calcium carbonate at the top of the inner cutter disc 2. When the inner cutter disc 2 rotates at high speed and the centrifugal force it generates on the ball 6 is sufficient to overcome the elastic force of the elastic element 10, the airflow flowing in the flow hole 12 can be directly transferred to the bottom of the inner cavity of the outer shell 1 to facilitate the crushing and grinding operation of nano-calcium carbonate.

[0037] like Figure 2 , Figure 4 as well as Figure 5 As shown, in this technical solution, the top of the support column 5 is provided with a first guide cover 8, and a second guide cover 11 is fixedly installed on the top of the outer surface of the connecting shaft 9. There is a gap between the first guide cover 8 and the second guide cover 11 to form a guide channel, thereby changing the flow direction of the high-speed airflow and making it flow outward along the top of the inner cutter disc 2, which effectively improves its cleaning effect on the residual nano-calcium carbonate powder at the top of the inner cutter disc 2.

[0038] In this technical solution, an electric heating wire is provided on the inner wall of the flow hole 12 on the connecting shaft 9, and it comes into contact with the gas flowing through it. This removes the water vapor contained in the gas, preventing it from being absorbed by the nano-calcium carbonate and affecting its drying properties. At the same time, the pulverized nano-calcium carbonate can be dried again, effectively avoiding the problem that the moisture inside the nano-calcium carbonate cannot be evaporated due to its large size during the drying process.

[0039] like Figure 6 As shown, in this technical solution, a second conductive ring 16 is provided inside the bottom end of the support column 5, and a first conductive ring 15 is provided at the bottom of the outer surface of the connecting shaft 9. Initially, the first conductive ring 15 is located above the second conductive ring 16. At the same time, a conductive connection circuit is formed between the first conductive ring 15, the second conductive ring 16 and the heating wire on the flow hole 12. Thus, the heating wire can only be triggered when the vortex pulverizer is pulverizing nano-calcium carbonate. When the inner blade 2 is rotating at low speed or not rotating at all, the heating wire will not be triggered.

[0040] A preparation process using modified nano-calcium carbonate preparation equipment includes the following steps:

[0041] S1. Add nano-calcium carbonate slurry to the reaction vessel, heat and stir to obtain nano-calcium carbonate suspension slurry;

[0042] The nano calcium carbonate slurry has a pH value of 8.5-9.5, a specific surface area (BET) of 18-60 m 2 / g, and the heating temperature is controlled between 85-95℃.

[0043] S2, the nano calcium carbonate suspension slurry is added with urea and fatty acid under stirring, and the stirring is continued until the modification of the nano calcium carbonate is completed.

[0044] The urea is used in an amount of 10-40% of the mass of the fatty acid.

[0045] The fatty acid includes a mixture of one or more of lauric acid, myristic acid, palmitic acid, stearic acid and oleic acid, and is added in an amount of 1.8-6.0% of the mass of the nano calcium carbonate in the slurry.

[0046] The stirring is continued for 30-200 min.

[0047] S3, the modified nano calcium carbonate slurry is cooled, filtered, dried and crushed to obtain a surface-modified nano calcium carbonate product.

[0048] The drying is performed by hot air drying at a temperature of 85-150℃ to control the final water content of the product to be less than 0.3%.

[0049] S31, while the dried nano calcium carbonate is fed into the inner cavity of the outer shell 1 through a feeding system, the power equipment and the external air pump are started, thereby driving the inner cutter head 2 to rotate at a high speed.

[0050] S32, the high-speed rotation of the inner cutter head 2 generates a centrifugal force on the ball 6, which moves outward and forces the support column 5 to move upward, thereby connecting the other end of the flow-through hole 12 to the lower chamber of the support column 5, and guiding the air flow to the inner cavity of the outer shell 1 through the flow guide hose 13 to assist in the crushing and grinding of the nano calcium carbonate.

[0051] S33, when the crushing and grinding of the nano calcium carbonate by the vortex crusher is completed, the rotation of the inner cutter head 2 is reduced or stopped, and the support column 5 is forced to move downward under the elastic force of the elastic member 10 to return to the initial position, and the other end of the flow-through hole 12 is connected to the upper chamber of the support column 5, and the air flow is guided to the top end of the inner cutter head 2 to clean the residual powder-like nano calcium carbonate thereon.

Claims

1. A modified nano calcium carbonate preparation device, comprising an outer shell (1), and a straight-toothed groove is arranged on the inner wall of the outer shell (1), an inner cutter head (2) is movably sleeved in the inner part of the outer shell (1), the bottom end of the inner cutter head (2) extends to the bottom of the outer shell (1), a transmission wheel (14) is fixedly installed on the bottom of the outer surface of the inner cutter head (2), and the transmission wheel (14) is in transmission connection with an external power equipment, characterized in that: a conical inclined surface (3) is arranged on the top of the inner cavity of the inner cutter head (2), a linear clamping groove (4) is arranged on the inner wall of the conical inclined surface (3), a support column (5) extending to the bottom of the inner cutter head (2) is movably sleeved in the inner part of the inner cutter head (2), a ball (6) is in transmission connection between the inner part of the linear clamping groove (4) and the support column (5), and a connecting shaft rod (9) is movably sleeved in the inner part of the support column (5). The middle part of the inner cavity of the support column (5) is fixedly installed with a gasket (7), and the inner cavity of the support column (5) is divided into two chambers by the gasket (7) and the connecting shaft rod (9), the lower chamber of the support column (5) is in communication with the inner cavity of the outer shell (1) through a flow guide hose (13), the inner part of the connecting shaft rod (9) is provided with a flow-through hole (12), one end of the flow-through hole (12) extends to the bottom of the connecting shaft rod (9) and is in communication with an external air pump, and the other end of the flow-through hole (12) extends to the middle part of the outer surface thereof. In the initial state, the other end of the flow-through hole (12) is in communication with the upper chamber of the support column (5), and as the preparation device works, the inner cutter head (2) rotates at high speed and drives the support column (5) to move upward, and the other end of the flow-through hole (12) penetrates through the gasket (7) and is in communication with the lower chamber of the support column (5). The connecting shaft rod (9) is elastically connected between the support column (5) through an elastic element (10) movably sleeved on the top of the outer surface thereof. The top end of the support column (5) is provided with a first flow guide cover (8), and the top of the outer surface of the connecting shaft rod (9) is fixedly installed with a second flow guide cover (11), and there is a gap between the first flow guide cover (8) and the second flow guide cover (11) to form a flow guide channel.

2. The modified nano calcium carbonate preparation device according to claim 1, characterized in that, The inner wall of the flow-through hole (12) on the connecting shaft rod (9) is provided with an electric heating wire and is in contact with the gas flowing therethrough.

3. The modified nano calcium carbonate preparation device according to claim 2, characterized in that, The inner part of the bottom end of the support column (5) is provided with a second conductive ring (16), and the bottom of the outer surface of the connecting shaft rod (9) is provided with a first conductive ring (15), and in the initial state, the first conductive ring (15) is located above the second conductive ring (16), and the first conductive ring (15), the second conductive ring (16) and the electric heating wire on the flow-through hole (12) form a conductive communication loop.

4. The modified nano calcium carbonate preparation device according to claim 3, characterized in that, The preparation process comprises the following steps:

5. A process for the preparation of a device using the modified nano calcium carbonate of claim 4, characterized by, S1, nano calcium carbonate slurry is added to a reaction kettle, heated and stirred to obtain nano calcium carbonate suspension slurry; S2, under stirring, nano calcium carbonate suspension slurry is added with urea and fatty acid, and continuous stirring is carried out to complete the modification of nano calcium carbonate. ​ S3, cooling, filtering, drying and crushing the modified nano calcium carbonate slurry to obtain a surface modified nano calcium carbonate product; S31, through the feeding system, the dried nano calcium carbonate is sent to the inner cavity of the outer shell (1), at the same time, the power equipment and the external air pump are started, and then the inner cutter head (2) is driven to rotate at high speed; S32, with the high-speed rotation of the inner cutter head (2), a centrifugal force corresponding to the size of the ball (6) can be generated, and the ball (6) is moved outward, and the support column (5) is forced to move upward, so that the other end of the flow-through hole (12) is communicated with the lower chamber of the support column (5), and the air is introduced into the inner cavity of the outer shell (1) through the flow guide hose (13), to assist the crushing and grinding of the nano calcium carbonate; S33, when the preparation equipment completes the crushing and grinding of the nano calcium carbonate, the rotation of the inner cutter head (2) is reduced or stopped, and the support column (5) is forced to move downward under the elastic force of the elastic member (10), so that it returns to the initial position, and the other end of the flow-through hole (12) is communicated with the upper chamber of the support column (5), and the airflow is introduced into the top end of the inner cutter head (2) to clean the residual powder-like nano calcium carbonate.

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