Method and equipment for modifying reflective heat-insulating titanium dioxide

Abstract

The invention provides a reflective heat-insulation titanium dioxide modification method and equipment, and the method comprises the following steps: S1, taking 100 parts by weight of titanium dioxide, and removing moisture contained in the titanium dioxide; step S2, adding 0.5-1 part by weight of antimony trioxide, 5-20 parts by weight of nano-zinc oxide and 5-20 parts by weight of silicon dioxide aerogel, and mixing with the moisture-removed titanium dioxide; s3, performing primary modification on the mixed material by using an organosiloxane coupling agent, and dispersing after the primary modification is completed; and S4, carrying out secondary modification to obtain the reflective heat-insulation titanium dioxide finished product. The antimony trioxide, the nano-zinc oxide and the silicon dioxide aerogel are added into the titanium dioxide for modification, the heat insulation and heat preservation effect of the titanium dioxide is improved, and the produced filler has good reflectivity through a simple production process, so that the probability of easy decomposition reaction of the titanium dioxide at high temperature is reduced, and the glossiness of the titanium dioxide is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium dioxide production, and in particular relates to a method and equipment for modifying reflective heat-insulating titanium dioxide. Background Art

[0002] There are two main production processes for titanium dioxide: sulfuric acid process and chlorination process. It is used in coatings, inks, papermaking, plastics and rubber, chemical fibers, ceramics and other industries. Titanium dioxide has extremely stable chemical properties. It is a slightly acidic amphoteric oxide. It hardly reacts with other elements and compounds at room temperature. It is insoluble in water, fat, dilute acid, inorganic acid and alkali. It is only soluble in hydrofluoric acid. Titanium dioxide is prone to decomposition at high temperatures, resulting in a decrease in glossiness and even discoloration. Therefore, improvements are needed to enhance the reflection and heat insulation capabilities of titanium dioxide.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and the present invention provides a method and equipment for modifying reflective heat-insulating titanium dioxide.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for modifying reflective heat-insulating titanium dioxide comprises the following steps:

[0007] Step S1, taking 100 parts by weight of titanium dioxide and removing the moisture contained in the titanium dioxide;

[0008] Step S2, adding 0.5-1 parts by weight of antimony trioxide, 5-20 parts by weight of nano zinc oxide and 5-20 parts by weight of silicon dioxide aerogel, and mixing with the titanium dioxide powder from which water is removed;

[0009] Step S3, using an organic siloxane coupling agent to modify the mixed material once, and then breaking it up after the modification is completed;

[0010] Step S4, after secondary modification, a finished reflective heat-insulating titanium dioxide product is obtained.

[0011] Preferably, the finished reflective heat-insulating titanium dioxide product is filtered, packaged and stored.

[0012] Preferably, the organic siloxane coupling agent is 0.1-0.5 parts by weight.

[0013] Preferably, the calcium carbonate with a calcium content of 75% is modified according to steps S1 to S4 to obtain a reflective insulating calcium carbonate product.

[0014] A thermal insulation titanium dioxide modification device is provided, which modifies titanium dioxide by any of the above-mentioned modification methods. The modification device comprises a drying device, a first modifier, a disintegrating device and a second modifier connected in sequence. The first modifier and the second modifier are any one of a high-speed mixer, a three-roller continuous modifier, a force modifier and a honeycomb mill modifier.

[0015] Preferably, the drying device comprises:

[0016] A drying cylinder, the drying cylinder is rotatably connected to the base, an air outlet pipe and a feed pipe are connected to the first end of the drying cylinder, and a discharge pipe and an air inlet pipe are provided at the second end of the drying cylinder;

[0017] A material guide plate, the material guide plate is located on the inner wall of the drying cylinder and extends spirally along the axial direction of the drying cylinder;

[0018] A mixing mechanism extends from the second end of the drying cylinder into the inner cavity of the drying cylinder.

[0019] Preferably, the mixing mechanism comprises:

[0020] A spiral material guide pipe, the spiral material guide pipe extends into the interior of the drying cylinder along the axial direction of the drying cylinder and is rotatably sealed and connected to the second end of the drying cylinder;

[0021] A material distributing nozzle, one end of which is fixed to the end of the spiral material guiding tube, and the other end is provided with a conical bottom, a plurality of discharge ports are provided at the lower side of the material distributing nozzle, and a plurality of elastic columns corresponding to the inner wall of the drying cylinder are evenly distributed on the periphery of the material distributing nozzle.

[0022] Preferably, the elastic column is connected to the outer wall of the material distributing nozzle via a spring, and the inner wall of the drying cylinder is provided with a plurality of paddles corresponding to the elastic column.

[0023] Preferably, a scattering cylinder corresponding to the feed pipe is provided at the second end of the drying cylinder, one end of the scattering cylinder is fixed to the drying cylinder through an annular baffle, and the other end is fixed to the inner wall of the drying cylinder through a plurality of fixing rods.

[0024] Beneficial effects: By adding antimony trioxide, nano zinc oxide and silicon dioxide aerogel to titanium dioxide for modification, the thermal insulation effect of titanium dioxide is increased. Through a simple production process, the filler produced has good reflectivity, thereby reducing the probability of titanium dioxide decomposition reaction at high temperature and ensuring the gloss of titanium dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0026] Figure 1 A simplified structural diagram of a drying device in a specific embodiment provided by the present invention;

[0027] Figure 2 It is a simplified cross-sectional view of a drying device in a specific embodiment provided by the present invention.

[0028] In the figure: 1. Drying cylinder; 2. Lifting machine; 3. Second end cover; 4. Spiral material guide pipe; 5. Base; 6. Air inlet pipe; 7. Discharge pipe; 8. Fabric nozzle; 9. Elastic column; 10. Paddle; 11. Auxiliary heating cylinder; 12. Breaking cylinder; 13. Annular baffle; 14. First end cover; 15. Air outlet pipe; 16. Positioning column. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0030] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0032] A reflective heat-insulating titanium dioxide modification method comprises the following steps: step S1, taking 100 parts by weight of titanium dioxide, removing the moisture contained in the titanium dioxide, the moisture in the titanium dioxide can be removed by a high-speed stirrer, or by a drying device, step S2, adding 0.5-1 parts by weight of antimony trioxide (for example, 0.5, 0.8, 1 parts by weight), 5-20 parts by weight of nano zinc oxide (for example, 5, 10, 15, 20 parts by weight) and 5-20 parts by weight of silicon dioxide aerogel (for example, 5, 10, 15, 20 parts by weight) after drying, and mixing with the titanium dioxide from which the moisture is removed after adding; ensuring the quality and stability of the titanium dioxide, antimony trioxide itself has good high temperature resistance and acid and alkali resistance, and antimony trioxide can absorb part of the decomposition products, thereby improving the service life and quality stability of the titanium dioxide. Nano zinc oxide is a new type of functional fine inorganic chemical material with the characteristics of small particle size and large specific surface area. It can be attached to the surface of titanium dioxide particles by surface coating to form a dense coating layer. This coating layer can improve the dispersibility of titanium dioxide, prevent its agglomeration, and give it new properties, so that the modified titanium dioxide may have higher hiding power, stronger weather resistance, better gloss and other properties. Silica aerogel is a material with extremely high porosity, low density, high specific surface area and excellent thermal insulation properties. Its unique nanoporous structure makes it have a wide range of application potential in thermal, acoustic, optical and other fields. In addition, silica aerogel also has good chemical stability and mechanical strength. These characteristics provide a basis for its application in modified titanium dioxide. This application directly physically mixes silica aerogel with titanium dioxide, and makes the two evenly dispersed by stirring, grinding and other processes. This modification method is simple and easy, but there may be problems such as uneven mixing and limited performance improvement.

[0033] After modification of the above three materials, the modified titanium dioxide can improve the weather resistance, stain resistance and glossiness of the coating; in plastics, it can improve the heat resistance, flame retardancy and mechanical properties of the plastics.

[0034] Step S3, using an organic siloxane coupling agent to modify the mixed material once, evenly coating the prepared coupling agent solution on the surface of the pretreated titanium dioxide, and then allowing the coupling agent to react chemically with the surface of the titanium dioxide through drying and other steps to form a uniform coating layer, thereby ensuring the bonding stability of the materials, and breaking up after the primary modification; Step S4, performing secondary modification through a modifying machine to obtain a reflective insulation titanium dioxide finished product, and the secondary modification improves the mixing uniformity of the materials.

[0035] In this embodiment, only antimony trioxide, nano zinc oxide and / or silicon dioxide aerogel are added and then coated with an organic siloxane coupling agent. At this time, the reflectivity of titanium dioxide is generally between 92% and 94%. After adding the three materials at the same time, the reflectivity of titanium dioxide is between 97% and 98%, which effectively improves the reflective and heat-insulating ability of titanium dioxide.

[0036] In this embodiment, after actual experiments, 0.8 parts by weight of antimony trioxide, 15 parts by weight of nano zinc oxide and 15 parts by weight of silica aerogel are added to maximize the reflective and heat-insulating ability of titanium dioxide at the lowest cost. In any embodiment, the amount of each material is expressed in parts by weight.

[0037] In an optional embodiment, the finished reflective heat insulating titanium dioxide is filtered, packaged and stored. The organic siloxane coupling agent is 0.1-0.5 parts by weight (eg 0.1, 0.3, 0.5 parts by weight), preferably 0.3 parts by weight.

[0038] In an optional embodiment, calcium carbonate can be modified by the above method. Specifically, the calcium carbonate in the modified calcium carbonate has a calcium content of 75%. The reflective heat-insulating calcium carbonate product can be obtained by the above method.

[0039] In addition, for the above modification method, the present application also provides a thermal insulation titanium dioxide modification device, such as Figure 1-2 As shown, the modification equipment includes a drying device, a first modifier, a disintegrating device and a second modifier connected in sequence, and the first modifier and the second modifier are any one of a high-speed mixer, a three-roller continuous modifier, a force modifier, and a honeycomb mill modifier.

[0040] For example, firstly, the materials are dried by a drying device, antimony trioxide, nano zinc oxide and silica aerogel are added in the process, and then discharged into a high-speed mixer, where an organic siloxane coupling agent is added for primary modification, and then the materials are dispersed by a dispersing device and then subjected to secondary modification by a high-speed mixer to ensure the uniformity and stability of the modified materials.

[0041] In an optional embodiment, the drying device includes a drying cylinder 1, a material guide plate and a mixing mechanism. The drying cylinder 1 is a metal cylinder with open ends. The drying cylinder 1 is rotatably connected to a base 5. There are two bases 5, which are respectively located at the two ends of the drying cylinder 1. The base 5 can be concrete or a metal truss, and a U-shaped or arc-shaped supporting surface is provided on the top thereof for supporting the drying cylinder 1. Rollers or rollers are provided on the arc-shaped supporting surface so that the drying cylinder 1 can rotate. A gear ring is provided in the middle of the drying cylinder 1, and a speed regulating motor is provided below the drying cylinder 1 to engage the gear ring through a driving gear.

[0042] An air outlet pipe 15 and a feed pipe are connected at the first end of the drying cylinder 1. Specifically, a first end cover 14 is provided at the first end of the drying cylinder 1. The first end cover 14 is a square cavity, and a corresponding side of the drying cylinder 1 is rotatably sealed and connected through corresponding perforations. The air outlet pipe 15 is located on the side of the first end cover 14 away from the drying cylinder 1. The feed pipe extends from the top to the bottom into the first end cover 14 and then extends obliquely into the drying cylinder 1. The upper end of the feed pipe is correspondingly connected to the lifting machine 2.

[0043] A discharge pipe 7 and an air inlet pipe 6 are provided at the second end of the drying cylinder 1; a second end cover 3 is provided at the second end of the drying cylinder 1, and the second end cover is a square cavity, which is rotatably sealed and connected to one side of the corresponding drying cylinder 1 through corresponding perforations. The discharge pipe 7 is located at the lower end of the second end cover 3, and a corresponding conical nozzle is provided at the lower part of the second end cover 3. The discharge pipe 7 is correspondingly connected to the feed end of the first modifier (high-speed mixer), and a modification can be carried out after adding the organic siloxane coupling agent. An air inlet pipe 6 is provided above the second end cover 3, and the air inlet pipe 6 is correspondingly connected to the fan, which can supply hot air or conventional drying air to the drying cylinder 1. A guide plate is provided on the inner wall of the drying cylinder 1, and the guide plate is a metal plate, which is fixed to the drying cylinder 1 by welding. The guide plate extends spirally along the axial direction of the drying cylinder 1, and the two ends of the guide plate extend to the two ends of the drying cylinder 1. The mixing mechanism extends from the second end of the drying cylinder 1 into the inner cavity of the drying cylinder 1, and the mixing mechanism is used to introduce the mixed antimony trioxide, nano zinc oxide and silica aerogel into the inner cavity of the drying cylinder 1.

[0044] In an optional embodiment, the mixing mechanism includes a spiral material guide tube 4 and a material distribution nozzle 8, wherein a spiral material guide shaft is provided inside the spiral material guide tube 4, which passes through the second end cover 3 along the axis of the drying cylinder 1 and extends into the drying cylinder 1, specifically located at one-third of the drying cylinder 1. A feed port is provided at one end of the spiral material guide tube 4, and the other end is open and correspondingly connected to the material distribution nozzle 8. The material distribution nozzle 8 is a metal tube. The spiral material guide tube 4 extends into the interior of the drying cylinder 1 along the axial direction of the drying cylinder 1, and is rotationally sealed and connected to the second end of the drying cylinder 1.

[0045] One end of the distribution nozzle 8 is connected to the end of the spiral guide tube 4, and the other end is provided with a conical bottom, which is sealed by the conical bottom. A plurality of discharge ports are provided on the lower side of the distribution nozzle 8, and the discharge ports are distributed in an array, and the area range in the circumferential direction is not more than 180 degrees of the arc corresponding to the distribution nozzle 8. A plurality of elastic columns 9 corresponding to the inner wall of the drying cylinder 1 are evenly distributed on the outer periphery of the distribution nozzle 8. During the rotation of the drying cylinder 1, the elastic columns 9 knock against the inner wall of the drying cylinder 1, thereby generating vibration, so that the internal powder can quickly flow into the drying cylinder 1, so that the titanium dioxide passes through the discharge port and is preliminarily mixed during the subsequent rotation process.

[0046] In this embodiment, the main body of the elastic column 9 is a metal column, which is connected to the outer wall of the cloth nozzle 8 by a spring. In order to increase the vibration force generated by the elastic column 9, a plurality of paddles 10 corresponding to the elastic column 9 are provided on the inner wall of the drying cylinder 1. The paddles 10 extend radially along the drying cylinder 1, and the width is adapted to the material guide plate. The paddles 10 are arc-shaped, and the bending direction is away from the rotation direction of the drying cylinder 1, so that the elastic column 9 can vibrate after passing through the paddles 10, and the material can be lifted up on the inner wall along with the drying cylinder 1, thereby improving the mixing uniformity.

[0047] In another optional embodiment, the second end of the drying cylinder 1 is provided with a breaking up cylinder 12 corresponding to the feed pipe. The main body of the breaking up cylinder 12 is welded from metal rods. One end of the breaking up cylinder 12 is fixed to the drying cylinder 1 through an annular baffle 13, so that a seal is formed between the end of the breaking up cylinder 12 and the drying cylinder 1 to prevent powder from overflowing. The other end is fixed to the inner wall of the drying cylinder 1 through a plurality of fixing rods. There are a plurality of fixing rods, which extend radially along the drying cylinder 1 and are evenly distributed circumferentially thereof. The end of the drying cylinder 1 corresponding to the fixing rod is a closed end. During the rotation process, the titanium dioxide powder is broken up and enters the drying cylinder 1 from between the metal rods without affecting the internal hot air circulation, thereby improving the drying effect and the looseness of the titanium dioxide powder.

[0048] In an optional embodiment, the inner diameter of the annular baffle 13 is smaller than the inner diameter of the scattering cylinder 12, forming a stopping edge to stop the titanium dioxide powder.

[0049] In an optional embodiment, a lifting plate is provided in the inner arm of the drying cylinder 1. The length of the lifting plate is two-thirds of the drying cylinder 1. The lifting plate is specifically located at the end away from the mixing mechanism. The lifting plate may be L-shaped and bent in the rotation direction of the drying cylinder 1, so that the material is lifted as it rotates, ensuring that the material is fully in contact with the hot air.

[0050] Furthermore, an auxiliary heating cylinder 11 is provided between the mixing mechanism and the breaking up cylinder 12. The auxiliary heating cylinder 11 has a certain length. The auxiliary heating cylinder 11 is welded from a hollow metal tube and includes two annular hoops and multiple branch pipes. The two annular hoops are respectively located at both ends of the auxiliary heating cylinder 11. Multiple branch pipes are provided between the two ends of the two auxiliary heating cylinders 11 to form a grid-shaped cylinder body. Heating wires are provided inside the annular hoops and branch pipes of the auxiliary heating cylinder 11, so that the internal materials can be heated by correspondingly connecting to a power source, and the auxiliary lifting plate improves the drying effect.

[0051] A plurality of positioning columns 16 corresponding to the inner wall of the drying cylinder 1 are arranged on the outer wall of the auxiliary heating cylinder 11 to fix the auxiliary heating cylinder 11. The outer diameter of the auxiliary heating cylinder 11 is smaller than the diameter of the corresponding circle on the inner side of the lifting plate, so that the lifted materials are scattered on the auxiliary heating cylinder 11. The discharge end of the drying cylinder 1 is tilted downward, with an inclination angle of 2-5°.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A method for modifying reflective heat-insulating titanium dioxide, characterized in that: The following steps are involved: Step S1, taking 100 parts by weight of titanium dioxide and removing the moisture contained in the titanium dioxide; Step S2, adding 0.5-1 parts by weight of antimony trioxide, 5-20 parts by weight of nano zinc oxide and 5-20 parts by weight of silicon dioxide aerogel, and mixing with the titanium dioxide powder from which water is removed; Step S3, using an organic siloxane coupling agent to modify the mixed material once, and then breaking it up after the modification is completed; Step S4, after secondary modification, a finished reflective heat-insulating titanium dioxide product is obtained.

2. The method for modifying reflective heat-insulating titanium dioxide according to claim 1, characterized in that: The finished reflective thermal insulation titanium dioxide product is filtered, packaged and stored.

3. The method for modifying reflective heat-insulating titanium dioxide according to claim 1, characterized in that: The organic siloxane coupling agent is 0.1-0.5 parts by weight.

4. The method for modifying reflective heat-insulating titanium dioxide according to claim 1, characterized in that: According to steps S1 to S4, the calcium carbonate with a calcium content of 75% is modified to obtain a reflective heat-insulating calcium carbonate product.

5. A thermal insulation titanium dioxide modification device, which performs titanium dioxide modification by any modification method described in claims 1-4, characterized in that: The modification equipment comprises a drying device, a first modifier, a disintegrating device and a second modifier which are connected in sequence. The first modifier and the second modifier are any one of a high-speed mixer, a three-roller continuous modifier, a force modifier and a honeycomb mill modifier.

6. The thermal insulation titanium dioxide modification equipment according to claim 5, characterized in that: The drying device comprises: A drying cylinder, the drying cylinder is rotatably connected to the base, an air outlet pipe and a feed pipe are connected to the first end of the drying cylinder, and a discharge pipe and an air inlet pipe are provided at the second end of the drying cylinder; A material guide plate, the material guide plate is located on the inner wall of the drying cylinder and extends spirally along the axial direction of the drying cylinder; A mixing mechanism extends from the second end of the drying cylinder into the inner cavity of the drying cylinder.

7. The thermal insulation titanium dioxide modification equipment according to claim 6 is characterized in that: The mixing mechanism comprises: A spiral material guide pipe, the spiral material guide pipe extends into the interior of the drying cylinder along the axial direction of the drying cylinder and is rotatably sealed and connected to the second end of the drying cylinder; A material distributing nozzle, one end of which is fixed to the end of the spiral material guiding tube, and the other end is provided with a conical bottom, a plurality of discharge ports are provided at the lower side of the material distributing nozzle, and a plurality of elastic columns corresponding to the inner wall of the drying cylinder are evenly distributed on the periphery of the material distributing nozzle.

8. The thermal insulation titanium dioxide modification equipment according to claim 7 is characterized in that: The elastic column is connected to the outer wall of the material dispensing nozzle through a spring, and the inner wall of the drying cylinder is provided with a plurality of paddles corresponding to the elastic column.

9. The thermal insulation titanium dioxide modification equipment according to claim 5, characterized in that: The second end of the drying cylinder is provided with a scattering cylinder corresponding to the feed pipe, one end of the scattering cylinder is fixed to the drying cylinder through an annular baffle, and the other end is fixed to the inner wall of the drying cylinder through a plurality of fixing rods.

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