CN215712735U - Heavy calcium carbonate continuous atomization modification device for silicone adhesive - Google Patents
Heavy calcium carbonate continuous atomization modification device for silicone adhesive Download PDFInfo
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Abstract
The utility model discloses a heavy calcium carbonate continuous atomization modification device for silicone adhesive, which comprises a primary mixing cavity and a rear mixing cavity, wherein a first powder injection head is arranged at the top of the primary mixing cavity; a second powder spray head is arranged under the first powder spray head, and a first butt-collision area T1 is formed above the second powder spray head; the lower part of the primary mixing cavity is of a funnel structure, and a first mixing area M1 is formed; the upper part of the rear mixing cavity is of a bell mouth structure with a narrow upper part and a wide lower part, a modifier atomizing head is arranged at the central position of the lower part corresponding to the bell mouth structure, and a second collision area T2 is formed above the modifier atomizing head; the lower part of the rear mixing cavity is of a funnel structure, so that a second mixing area M2 is formed; the lower part of the primary mixing cavity is communicated with the upper part of the rear mixing cavity; the lower end of the rear mixing cavity is a material pumping opening. The utility model realizes the beneficial effects of uniform powder coating, good modification and activation effects and stable quality of modified products.
Description
Technical Field
The utility model relates to the technical field of heavy calcium carbonate modification and activation, and particularly relates to a continuous heavy calcium carbonate atomization modification device for silicone adhesive.
Background
Calcium carbonate is an important and widely used chemical raw material. According to different production methods of calcium carbonate, the calcium carbonate can be divided into three major categories, namely light calcium carbonate, heavy calcium carbonate and nano calcium carbonate. The light calcium carbonate is also called precipitated calcium carbonate and is prepared by a chemical processing method; ground calcium carbonate, also known as ground calcium carbonate, is prepared by mechanically crushing natural limestone, calcite, chalk, etc. The nano calcium carbonate refers to calcium carbonate products with the granularity of 1-100 nm, and comprises superfine calcium carbonate products and superfine calcium carbonate products. In order to improve the application performance of calcium carbonate, improve the applicability, expand the market and use amount, the calcium carbonate needs to be modified, and the different types of calcium carbonate have different modification processes due to different characteristics. For example, nano calcium carbonate has some nano characteristics because of being in nano level, and all the methods generally adopt dry method or chemical reaction and the like for modification; the heavy calcium carbonate is powder with a large particle size obtained by simple mechanical grinding, so that the heavy calcium carbonate is generally suitable for a process of mechanical physical coating modification. The aim of activating and modifying the heavy calcium carbonate is to wrap a layer of modifier on the surface of each calcium carbonate particle by physical machinery depending on dispersing force, so that the surface characteristics of the calcium carbonate particles can be changed, and a good combination effect with a high molecular organic polymer is realized. However, the modified calcium carbonate of the same variety has quality difference due to problems of process, control of related parameters and the like, and in principle, the higher the mixing ratio uniformity of the modifier and the calcium carbonate particles is, the lower the agglomeration rate is, and the lower the whiteness is, the better the activation quality is and the more stable the performance is. As the above principle is understood by various manufacturers, but the quality is difficult to be improved or the quality stability of each batch of production is not controllable, for example, the main problem of modifying calcium carbonate special for silicone adhesive is that: (1) the two modifiers are difficult to highly disperse and uniformly mix with the powder due to the viscosity of the modifiers and the problems of the traditional process, so that the mixing proportion of the modifiers and the powder is locally disordered; (2) the prior device is difficult to realize the precise regulation and control of relevant key parameters (the traditional device and the process adopt a mixing mode of a modifier for spraying powder, the temperature fluctuation is large in the impact process and the spraying mixing is not uniform, the temperature of a key mixing area in a mixing cavity stirred by impact is extremely difficult to control accurately, so the modification effect can be directly influenced, meanwhile, fluid flows, the effective mixing time of the fluid in the mixing cavity is also difficult to control, the fluctuation of airflow in the mixing cavity is difficult to control, the vacuum degree can not be controlled accurately and effectively by the simple control of the traditional device, which is better than that of a large-pipe-diameter conveying pipe with larger fluid fluctuation, and the large valve on the device is used for carrying out precise fine adjustment on the large valve, but is difficult to realize stable and micro regulation and control on the conveyed fluid) based on the various factors, the quality of the calcium carbonate powder special for the silicone adhesive in the industry is uneven, the quality difference is large, and the price difference is large.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems, the utility model provides the calcium carbonate continuous atomization modification device for the silicone adhesive, which is easy to regulate and control and has a good modification effect.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a heavy calcium carbonate continuous atomization modification device for silicone adhesive comprises a primary mixing chamber and a rear mixing chamber, wherein a first powder injection head is arranged at the top of the primary mixing chamber; a second powder spray head is arranged under the first powder spray head, and a first butt-collision area T1 is formed above the second powder spray head; the lower part of the primary mixing cavity is of a funnel structure, and a first mixing area M1 is formed; the upper part of the rear mixing cavity is of a bell mouth structure with a narrow upper part and a wide lower part, a modifier atomizing head is arranged at the central position of the lower part corresponding to the bell mouth structure, and a second collision area T2 is formed above the modifier atomizing head; the lower part of the rear mixing cavity is of a funnel structure, so that a second mixing area M2 is formed; the lower part of the primary mixing cavity is communicated with the upper part of the rear mixing cavity; the lower end of the rear mixing cavity is a material pumping opening.
Furthermore, the first powder injection head and the second powder injection head are both composed of a central discharge pipe and a high-pressure gas injection pipe; the gas outlet of the high-pressure gas injection pipe is coated on the periphery of the discharge hole of the central discharge pipe; the included angle between the central axis of the gas outlet of the high-pressure gas injection pipe and the central axis of the discharge hole of the central discharge pipe is 25-45 degrees.
Further, the inner walls of the primary mixing cavity and the rear mixing cavity are respectively provided with a constant-temperature heating device; the temperature of the inner cavity of the primary mixing cavity is maintained between 45 and 60 ℃; the temperature of the inner cavity of the rear mixing cavity is maintained between 70 and 90 ℃.
Furthermore, the modifier atomizing head consists of a central discharge pipe and a high-pressure gas injection pipe.
Further, the modifier atomizing head is a centrifugal atomizing nozzle.
Furthermore, a constant-temperature heater of the conveying pipe is further coated outside the conveying pipe of the modifier atomizing head.
Further, a first temperature-sensing resistor module and a second temperature-sensing resistor module are respectively distributed in the first mixing zone M1 and the second collision zone T2.
The process for modifying the calcium carbonate for the silicone adhesive by using the continuous ground limestone atomization modification device for the silicone adhesive comprises the following steps:
(1) primarily heating calcium carbonate powder to 45-60 ℃, and then sending hot air at 45-60 ℃ to a central discharge pipe of the first powder injection head, wherein hot air at 0.3-0.4 MPa and at 45-60 ℃ is injected into a high-pressure air injection pipe of the first powder injection head;
(2) primarily heating stearic acid powder to 40-55 ℃, and then sending hot air at 40-55 ℃ to a central discharge pipe of the second powder injection head, wherein hot air at 0.4-0.5 MPa and at 40-55 ℃ is injected into a high-pressure air injection pipe of the second powder injection head;
(3) maintaining the temperature of the first mixing zone M1 at 50-65 ℃ by adjusting the temperature parameters in the step (1) and the step (2);
(4) firstly keeping the temperature of a silane coupling agent at 70-90 ℃, then spraying the silane coupling agent from the modifier atomizing head, and maintaining the temperature of a T2 area of the second collision area at 65-85 ℃ by adjusting the temperature of the constant-temperature heater of the material conveying pipe;
(5) after the materials are pumped out from the material pumping port, the materials are directly sent into a depolymerization and scattering machine to be scattered at a high speed, and the depolymerization temperature in the host machine is kept at 100-105 ℃;
(6) the negative pressure value in the primary mixing cavity and the back mixing cavity is kept between-2000 Pa and-3000 Pa. Furthermore, when the modifier atomizing head is composed of a central discharge pipe and a high-pressure air injection pipe, hot air flow with the pressure of 0.4-0.5 MPa and the temperature of 70-90 ℃ is adopted for air injection in the high-pressure air injection pipe. Furthermore, when the modifier atomizing head adopts a centrifugal atomizing nozzle, the rotating speed of the motor is adjusted until the radius outer edge of the sprayed atomized liquid is close to the upper inner cavity of the rear mixing cavity.
Compared with the prior art, the utility model has the beneficial effects that:
(1) by adopting the utility model, the temperature of two key areas of the first mixing area M1 area and the second colliding area T2 area and the precision adjustment of related raw material proportion can be realized by regulating and controlling the temperature, the pressure, the powder content in the fluid and the temperature and the pressure of the air flow in the constant temperature heat supply device and the first powder injection head and the second powder injection head as well as the temperature and the pressure of the raw material and the constant temperature heater of the material conveying pipe.
(2) The first powder injection head and the second powder injection head are adopted for hedging, so that the calcium carbonate powder and the stearic acid powder form two approximately conical injection contact surfaces, more efficient mixing is realized, and the temperature difference between the calcium carbonate powder and the silane coupling agent is effectively reduced by precisely controlling the related temperature. By regulating and controlling the powder content in each fluid, more complete mixing and accurate regulation and control of the ratio of each component are realized.
(3) The lower part of the primary mixing cavity is provided with a funnel structure with a wide upper part and a narrow lower part, so that the stearic acid powder is further mixed with the calcium carbonate powder before being melted, meanwhile, the rear mixing cavity is designed into a structure with a narrow top and a wide bottom, and is combined with a modifier atomizing head, particularly a centrifugal atomizing nozzle is adopted to realize a silane coupling agent spraying surface which is close to a disc shape, further realizing the quantitative spraying of the solid phase mixture which just diverges and flows downwards, wherein the adoption of the centrifugal atomizing nozzle is better than the adoption of the spray head structure, the adoption of the spray head structure can form an approximately conical spray surface, so that the quantitative spraying of the fluid mixture which flows downwards is difficult to achieve, the spraying amount of at least the fluid mixture in the middle part is not uniform with the spraying amount of the fluid mixture at the periphery, but the overall modification activity is influenced, so that the centrifugal atomizing nozzle is the best choice.
(4) The first mixing area M1 is located at the upper section of the mixture entering the second collision area T2, the temperature of the mixture is maintained between 50 ℃ and 65 ℃, the first purpose is mainly to prevent the stearic acid powder from reaching the melting point and from melting, further when the two material mixtures reach the first mixing area M1 and are further mixed and dissolved, the stearic acid powder can be effectively maintained in a non-liquid phase state, the phenomena of agglomeration and inner cavity wall adhesion are effectively avoided, meanwhile, the temperature difference with the second collision area T2 is reduced, when the two material mixtures reach the second collision area T2, the two material mixtures are effectively sprayed and mixed by the sprayed high-temperature silane coupling agent, the stearic acid powder starts to melt and is mixed and dissolved with the calcium carbonate powder, further until the two modifying agents in the S area are uniformly absorbed by the powder and coated on the surface of the powder to form a film, and further shrink and are dissolved at the high temperature of 70 ℃ to 90 ℃ below the rear mixing cavity, the lower part of the rear mixing cavity is only a small section, the fluid circulation time is short, and then the fluid directly enters a scattering machine finished product, so that the high-efficiency, stable and high-quality preparation of the calcium carbonate powder special for the silicone adhesive is realized, the defective rate is extremely low, and the integral activation effect is obviously improved.
Drawings
Fig. 1 is a cross-sectional view of the present invention.
Detailed Description
As shown in fig. 1, a continuous atomization modification device for ground calcium carbonate for silicone adhesive comprises a primary mixing chamber 1 and a rear mixing chamber 14, wherein a first powder injection head is arranged at the top of the primary mixing chamber 1; a second powder injection head is arranged under the first powder injection head, and the first powder injection head and the second powder injection head are both composed of central discharge pipes 3 and 6 and high-pressure gas injection pipes 4 and 5; the gas outlet of the high-pressure gas injection pipe is coated on the periphery of the discharge hole of the central discharge pipe; the included angle between the central axis of the gas outlet of the high-pressure gas injection pipe and the central axis of the discharge hole of the central discharge pipe is 25-45 degrees, and 30 degrees or 35 degrees and the like can be optimized. A first collision area T1 area is formed above the second powder spray head, and efficient collision mixing of the calcium carbonate powder and the stearic acid powder on two conical spray surfaces is realized in the first collision area; the lower part 7 of the primary mixing cavity is of a funnel structure to form a first mixing area M1 which can further contract the mixed fluid above, so that the intermixing effect and the uniformity are improved; the upper part 8 of the rear mixing cavity 14 is of a bell mouth structure with a narrow upper part and a wide lower part, a modifier atomizing head 13 is arranged at the central position of the lower part corresponding to the bell mouth structure, and a second collision area T2 is formed above the modifier atomizing head; the modifier atomizing head also can be composed of a central discharge pipe and a high-pressure gas injection pipe. However, a centrifugal atomizing head may be preferably used mainly for forming a spray surface closer to a disk shape and ensuring more uniform mixing of the silane coupling agent and the powder. The lower part of the rear mixing cavity 14 is of a funnel structure, so that a second mixing area M2 is formed; the lower part of the primary mixing cavity is communicated with the upper part of the rear mixing cavity; the lower end of the rear mixing cavity is a material pumping opening. The inner walls of the primary mixing cavity and the rear mixing cavity are respectively provided with constant- temperature heating devices 2 and 11, and hot oil constant-temperature heating devices are preferably adopted; the temperature of the inner cavity of the primary mixing cavity is maintained between 45 and 60 ℃, and preferably 50 ℃, 55 ℃ and the like are also selected; the temperature of the inner cavity of the rear mixing cavity is maintained between 70 ℃ and 90 ℃, and the temperature of 75 ℃, 80 ℃, 85 ℃ and the like can be optimized. The feed delivery pipe of the modifier atomizing head 13 can be made of metal preferentially, and is externally wrapped with a feed delivery pipe constant temperature heater 12, which is mainly based on that the liquid modifier has large heat loss after long-distance delivery (different heat dissipation in summer or winter), and in order to ensure the constant temperature of relevant areas, the feed delivery pipe constant temperature heater 12 is needed to be arranged so as to be timely and accurately regulated and controlled. A first temperature-sensing resistor module 10 and a second temperature-sensing resistor module 9 are respectively distributed in the first mixing zone M1 zone and the second collision zone T2 zone and are used for monitoring temperature.
Adopt this device can be through regulating and control temperature, pressure, the fluidic powder content etc. to above-mentioned each stage, and finally can realize the accurate regulation to each key regional temperature, velocity of flow, volume of spraying isoparametric, can realize the regulation accurate, can obtain the cladding naturally even, modify stable high-quality product.
The process for modifying the calcium carbonate for the silicone adhesive by adopting the utility model comprises the following steps:
(1) primarily heating calcium carbonate powder to 45-60 ℃, and then sending hot air at 45-60 ℃ to a central discharge pipe of the first powder injection head, wherein hot air at 0.3-0.4 MPa and at 45-60 ℃ is injected into a high-pressure air injection pipe of the first powder injection head;
(2) primarily heating stearic acid powder to 40-55 ℃, and then sending hot air at 40-55 ℃ to a central discharge pipe of the second powder injection head, wherein hot air at 0.4-0.5 MPa and at 40-55 ℃ is injected into a high-pressure air injection pipe of the second powder injection head;
(3) maintaining the temperature of the first mixing zone M1 at 50-65 ℃ by adjusting the temperature parameters in the step (1) and the step (2);
(4) firstly keeping the temperature of a silane coupling agent at 70-90 ℃, then spraying the silane coupling agent from the modifier atomizing head, and maintaining the temperature of a T2 area of the second collision area at 65-85 ℃ by adjusting the temperature of the constant-temperature heater of the material conveying pipe;
(5) after the materials are pumped out from the material pumping port, the materials are directly sent into a depolymerization and scattering machine to be scattered at a high speed, and the depolymerization temperature in the host machine is kept at 100-105 ℃;
(6) the negative pressure value in the primary mixing cavity and the back mixing cavity is kept between-2000 Pa and-3000 Pa.
When the modifier atomizing head is composed of a central discharge pipe and a high-pressure air injection pipe, hot air with pressure of 0.4-0.5 MPa and temperature of 70-90 ℃ is injected into the high-pressure air injection pipe.
When the modifier atomizing head adopts a centrifugal atomizing nozzle, the rotating speed of the motor is adjusted until the radius outer edge of the sprayed atomized liquid is close to the upper inner cavity of the rear mixing cavity.
The quality of the modified coarse whiting obtained by adopting the device and the process is as follows:
the beneficial effects of the modified calcium carbonate powder are judged according to the currently accepted main index, namely the oil absorption value, for representing the powder modification effect, the calcium carbonate raw material special for silicone adhesive and the modified product of the calcium carbonate raw material special for silicone adhesive are subjected to random sampling detection by entrusting Guangxi calcium carbonate product quality detection center, and the detection results are as follows:
as can be seen from the above table, by adopting the device and the process method of the utility model, the oil absorption value of the calcium carbonate raw material special for silicone adhesive is reduced from 26g/100g to 9.9g/100g, and the oil absorption value is reduced by 16.1g/100g, while the oil absorption value of the heavy calcium carbonate special for silicone adhesive, which is generally modified by adopting the conventional traditional modification process in the industrial industry, can only be reduced by 5-8 g/100g, and at most, the oil absorption value of few processes can only be reduced by 10g/100g at present. Meanwhile, by adopting the technical scheme of the utility model, the whiteness of the modified finished product is not obviously reduced, only 1.2 is reduced, and the final whiteness value is as high as 94.5, so that the technical progress is obvious.
In order to better embody the beneficial effects of the utility model, the oil absorption value of the product is compared with the oil absorption values of other brands of common similar products to embody the technical level of the product in the current industry, the oil absorption values of the other brands of similar products are collected from commercial promotion data disclosed by the official website of the brand (because of market competition related to the brand, promoted parameters can be considered as the optimal values of the product model), and the comparison is as follows:
therefore, the quality of the heavy calcium carbonate special for the silicone adhesive obtained by the method is obviously higher than that of the current production in the same industry, and the technical scheme of the utility model has obvious progress compared with the prior art.
Claims (7)
1. The utility model provides a modified device of ground limestone continuous atomization for silicone adhesive which characterized in that: the powder spraying device comprises a primary mixing cavity and a rear mixing cavity, wherein a first powder spraying head is arranged at the top of the primary mixing cavity; a second powder spray head is arranged under the first powder spray head, and a first butt-collision area T1 is formed above the second powder spray head; the lower part of the primary mixing cavity is of a funnel structure, and a first mixing area M1 is formed; the upper part of the rear mixing cavity is of a bell mouth structure with a narrow upper part and a wide lower part, a modifier atomizing head is arranged at the central position of the lower part corresponding to the bell mouth structure, and a second collision area T2 is formed above the modifier atomizing head; the lower part of the rear mixing cavity is of a funnel structure, so that a second mixing area M2 is formed; the lower part of the primary mixing cavity is communicated with the upper part of the rear mixing cavity; the lower end of the rear mixing cavity is a material pumping opening.
2. The continuous atomization modification device of ground calcium carbonate for silicone adhesive according to claim 1, characterized in that: the first powder injection head and the second powder injection head are both composed of a central discharge pipe and a high-pressure gas injection pipe; the gas outlet of the high-pressure gas injection pipe is coated on the periphery of the discharge hole of the central discharge pipe; the included angle between the central axis of the gas outlet of the high-pressure gas injection pipe and the central axis of the discharge hole of the central discharge pipe is 25-45 degrees.
3. The continuous atomization modification device of ground calcium carbonate for silicone adhesive according to claim 1, characterized in that: the inner walls of the primary mixing cavity and the rear mixing cavity are respectively provided with a constant-temperature heating device; the temperature of the inner cavity of the primary mixing cavity is maintained between 45 and 60 ℃; the temperature of the inner cavity of the rear mixing cavity is maintained between 70 and 90 ℃.
4. The continuous atomization modification device for the ground calcium carbonate for the silicone adhesive, according to claim 2, is characterized in that: the modifier atomizing head consists of a central discharge pipe and a high-pressure gas injection pipe.
5. The continuous atomization modification device of ground calcium carbonate for silicone adhesive according to claim 1, characterized in that: the modifier atomizing head is a centrifugal atomizing nozzle.
6. The continuous atomization modification device of ground calcium carbonate for silicone adhesive according to claim 1, characterized in that: the outside of the conveying pipe of the modifier atomizing head is also coated with a conveying pipe constant-temperature heater.
7. The continuous atomization modification device of ground calcium carbonate for silicone adhesive according to claim 1, characterized in that: the first mixing zone M1 zone and the second collision zone T2 zone are respectively distributed with a first temperature-sensing resistance module and a second temperature-sensing resistance module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112920623A (en) * | 2021-03-31 | 2021-06-08 | 广西贺州市科隆粉体有限公司 | Heavy calcium carbonate continuous atomization modification device for silicone adhesive and modification process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112920623A (en) * | 2021-03-31 | 2021-06-08 | 广西贺州市科隆粉体有限公司 | Heavy calcium carbonate continuous atomization modification device for silicone adhesive and modification process thereof |
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