CN111252808A - Method for preparing special rutile titanium dioxide for high-weather-resistance plastics - Google Patents
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Abstract
The invention discloses a method for preparing special rutile titanium dioxide for high-weatherability plastics, which comprises the following steps: carrying out acidolysis on the titanium concentrate, carrying out impurity removal treatment by using a flocculating agent consisting of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminium chloride, carrying out solid-liquid separation to obtain a refined titanium solution, adding rutile seed crystals and a crystal form control agent to carry out hydrolysis reaction, and washing for the second time to obtain slurry; adding a dispersing agent and a zirconium sulfate salt treating agent into the slurry, performing filter pressing, calcining in a rotary kiln, cooling, grinding into powder, crushing by a steam powder crusher, adding a surface modifier during steam flow crushing, wherein the surface modifier consists of polysiloxane urethane acrylate and an aluminum methacrylate-zirconium coupling agent, and obtaining the special rutile titanium dioxide for the high-weatherability plastic. The titanium dioxide prepared by the method has the advantages of excellent weather resistance, high glossiness, good dispersibility, high whiteness and the like, and the weather resistance and the processability of plastics can be improved after the plastics are filled.
Description
Technical Field
The invention belongs to the technical field of titanium dioxide production, and particularly relates to a method for preparing special rutile titanium dioxide for high-weather-resistance plastics.
Background
Titanium dioxide, i.e. titanium dioxide, is an important inorganic chemical raw material. Because of its non-toxicity, stable physical and chemical properties, it has excellent optical and electrical properties and excellent pigment performance, and can be extensively used in the fields of coating, printing ink, plastics, rubber, paper-making, chemical fibre, art pigment, daily cosmetics, enamel, ceramics and electronics, etc. The rutile type titanium dioxide is produced by a sulfuric acid method, and the titanium dioxide and concentrated sulfuric acid are subjected to acidolysis reaction to generate
The intermediate titanyl sulfate needs to be hydrolyzed into metatitanic acid and sulfuric acid, and the metatitanic acid is washed, calcined, crushed and the like to obtain the titanium dioxide product.
The TiO2 without surface treatment has photochemical activity, so that the organic matter around the TiO2 is degraded to generate chalking phenomenon. Therefore, when the titanium dioxide is applied to plastics, the titanium dioxide needs to be subjected to surface modification, namely, oxide films of silicon, aluminum, zirconium and the like which are continuously coated are formed on the surfaces of TiO2 particles, so that a barrier is formed between the TiO2 particles and organic matters around the particles, and the weather resistance of the titanium dioxide is improved. At present, the modification method of plastics and titanium dioxide which are commonly used at home and abroad is to add an inorganic surface treating agent for treatment, and coat one or more layers of oxides or hydrated oxides of SiO2, ZrO2 and Al2O3 on the surface of titanium dioxide particles; the method can improve the weather resistance and the luster of the titanium dioxide to a certain extent, but the improvement effect is not obvious, and the dispersibility of the titanium dioxide is poor, so that the method still can not meet the requirements of high-end plastic products.
Disclosure of Invention
The invention provides a method for preparing special rutile titanium dioxide for high-weather-resistance plastics, aiming at solving the problem that the titanium dioxide has poor weather resistance, dispersibility and glossiness. The titanium dioxide prepared by the method has the advantages of excellent weather resistance, high whiteness, good dispersibility and the like, and can improve the weather resistance and the processability of plastics after being filled with the plastics.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for preparing special rutile titanium dioxide for high-weather-resistance plastics comprises the following steps:
(1) adding sulfuric acid into the titanium concentrate for acidolysis to obtain a titanium suspension, adding a flocculating agent consisting of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminium chloride into the titanium suspension for impurity removal, standing, pumping out the upper half part of a clear liquid, conveying the upper half part into a primary pressure filter, adding an adsorbent, performing pressure filtration, performing solid-liquid separation, allowing the liquid after pressure filtration to enter a vacuum crystallization system, removing ferrous sulfate heptahydrate through a disc separator, and adding the adsorbent for secondary pressure filtration to obtain a refined titanium liquid;
(2) adding water into the refined titanium liquid to adjust the refined titanium liquid to 300-500 g/L, heating to 96 ℃, stirring, adding rutile seed crystal accounting for 2-4% of the dry mass of titanium dioxide in the refined titanium liquid and crystal form control agent accounting for 0.5-1.0%, wherein the crystal form control agent consists of sodium tartrate, disodium ethylene diamine tetraacetate and poly-sulfonated ethyleneimine; heating to boil, stopping heating for 30-60min, heating to boil for the second time, and maintaining the temperature and the micro pressure for 4-5h to obtain hydrolysate;
(3) washing the hydrolysate with water until the content of iron ions is below 150ppm, adding sulfuric acid for bleaching, washing with water for the second time until the content of iron ions is below 50ppm to obtain slurry;
(4) adding a dispersing agent and a zirconium sulfate salt treating agent into the slurry, uniformly stirring, carrying out filter pressing on the slurry by a filter press, then calcining a filter cake in a rotary kiln, cooling, grinding into powder, crushing by a steam powder crusher, adding a surface modifier during steam flow crushing, wherein the surface modifier consists of polysiloxane urethane acrylate and an aluminum methacrylate-zirconium coupling agent, and obtaining the special rutile titanium dioxide for the high-weatherability plastic.
Further, the dispersing agent consists of sodium lignosulfonate, polyoxyethylene abietic acid monoester sodium sulfonate and polyacrylic acid ammonium salt.
Further, the mass ratio of sodium lignin sulfonate, polyoxyethylene abietic acid monoester sulfonate sodium and polyacrylic acid ammonium salt in the dispersant is 3-5:0.5-2: 1-3; the adding amount of the titanium concentrate is 0.5-1.5% of the mass of the titanium concentrate.
Furthermore, the mass ratio of the maleic anhydride-styrene sulfonic acid copolymer, the sodium lignosulfonate and the polyaluminium chloride in the flocculant is 3-5:1-3:1, and the adding amount of the flocculant is 1-2% of the mass of the titanium concentrate.
Further, the adsorbent consists of diatomite and a zeolite molecular sieve in a mass ratio of 1: 1-3; the adding amount of the adsorbent is 0.8-1.5% of the mass of the titanium concentrate.
Further, the mass ratio of the sodium tartrate, the disodium ethylene diamine tetraacetate and the polysulfonated polyethyleneimine in the crystal form control agent is 4-8:1-3: 1.
Further, the adding amount of the zirconium sulfate is 0.5-1.0% of the mass of the titanium dioxide in the slurry based on the weight of the zirconium oxide.
Further, the addition amount of the surface modifier is 0.8-1.5% of the mass of the titanium dioxide in the slurry; the mass ratio of the polysiloxane urethane acrylate to the aluminum methacrylate-zirconium coupling agent is 3-5: 1.
Furthermore, the water pressure of the water washing is controlled to be 0.4-0.5MPa, and the flow rate is controlled to be 20-25 square/min.
Further, the calcination is carried out by heating to 350 ℃ for 0.5-1.0h, heating to 500 ℃ for 1.0-1.5h, and heating to 700 ℃ for 2-2.5 h.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the titanium dioxide prepared by the method has the advantages of excellent weather resistance, high glossiness, good dispersibility, high whiteness and the like, and the weather resistance and the processability of plastics can be improved after the plastics are filled.
2. According to the invention, polysiloxane urethane acrylate and aluminum methacrylate-zirconium coupling agent are added for surface modification, so that the weather resistance of titanium dioxide can be improved, yellowing is effectively reduced, and the weather resistance after plastic filling is obviously improved.
3. According to the method, a flocculating agent consisting of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminium chloride is used for removing impurities in the acidolysis process, and a method combining cationic and anionic flocculating agents is adopted, so that positively charged cationic metal impurities and negatively charged impurities can be effectively and stably removed, the impurity removing effect is remarkable, and the luster and whiteness of titanium white can be improved.
4. The method takes the adsorbent consisting of the diatomite and the zeolite molecular sieve as the filter aid, improves the adsorption capacity to impurities, and improves the purity and the whiteness of the prepared titanium dioxide.
5. In the invention, the dispersant consisting of sodium lignosulfonate, polyoxyethylene abietic acid monoester sodium sulfonate and polyacrylic acid ammonium salt is added in the hydrolysis process, so that the dispersibility of the titanium dioxide can be obviously improved, and the problem that the current titanium dioxide is easy to agglomerate is solved.
6. In the hydrolysis process, not only rutile seed crystals but also a crystal form control agent consisting of sodium tartrate, disodium ethylene diamine tetraacetate and poly-sulfonated ethyleneimine are added, so that the rutile content of the prepared titanium dioxide is over 95 percent, the particle size of the product is controlled to be D50=1.0-1.5 mu m, D90 is less than 3 mu m, the particle size distribution is narrow, and the particle size distribution is uniform.
7. The method comprises the steps of washing the metatitanic acid particles by two times, washing iron by the first time to be less than 150ppm, bleaching and dissolving ferric ions in the metatitanic acid particles by adding sulfuric acid, reducing the ferric ions in the metatitanic acid particles by using the ferric titanium to become ferrous ions, and finally washing the metatitanic acid particles by two times to further clean the ferric ions. And by well controlling the pressure and flow of the washing water, on one hand, the washing efficiency is improved, on the other hand, the scouring force of water on metal ions is improved, the neutralization impurities of the metatitanic acid are reduced, and the iron content is controlled to be below 50 ppm.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Example 1
A method for preparing special rutile titanium dioxide for high-weather-resistance plastics comprises the following steps:
(1) adding sulfuric acid with the mass being 2 times of that of the titanium concentrate into the titanium concentrate for acidolysis to obtain a titanium suspension, adding a flocculating agent consisting of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminum chloride with the mass ratio of 3:2:1 into the titanium suspension for impurity removal, wherein the adding amount of the flocculating agent is 1.2 percent of that of the titanium concentrate, standing, pumping out the upper half part of a clear liquid, conveying the upper half part of the clear liquid into a primary pressure filter, adding an adsorbent with the mass being 0.5 percent of that of the titanium concentrate, wherein the adsorbent consists of diatomite and a zeolite molecular sieve with the mass ratio of 1:2, performing pressure filtration, performing solid-liquid separation, feeding the liquid after the pressure filtration into a vacuum crystallization system, removing ferrous sulfate heptahydrate through a disc separator, and adding the adsorbent with the mass being 0.8 percent of the titanium concentrate for secondary;
(2) adding water into the refined titanium liquid to adjust the refined titanium liquid to 400g/L, heating to 96 ℃, stirring, adding rutile seed crystal accounting for 3.2 percent of the dry basis weight of titanium dioxide in the refined titanium liquid and a crystal form control agent accounting for 0.8 percent of the dry basis weight of titanium dioxide in the refined titanium liquid, wherein the crystal form control agent consists of sodium tartrate, disodium ethylene diamine tetraacetate and polyethylene imine sulfonate in a mass ratio of 5:2: 1; heating to boiling, stopping heating for 60min, heating again to boiling, and keeping the temperature and the micro pressure for 4h to obtain a hydrolysate;
(3) controlling the water pressure of the hydrolysate to be 0.45MPa, washing the hydrolysate with water at the flow rate of 20 square/min until the content of iron ions is below 150ppm, adding sulfuric acid for bleaching, and washing the hydrolysate with water for the second time until the content of iron ions is below 50ppm to obtain slurry;
(4) adding a dispersing agent accounting for 1.2 percent of the mass of the titanium dioxide in the slurry and a zirconium sulfate salt treating agent accounting for 0.6 percent of the mass of the titanium dioxide in the slurry by the weight of zirconium oxide into the slurry, uniformly stirring, carrying out filter pressing on the slurry by a filter press until the solid content is 55 percent, then transferring a filter cake to a kiln for calcination, wherein the calcination is carried out by heating to 350 ℃, keeping the temperature for 1.0 hour, heating to 450 ℃, keeping the temperature for 1.0 hour, heating to 650 ℃, keeping the temperature for 2.5 hours, cooling, grinding, crushing by a steam-powder crusher, adding a surface modifier accounting for 1.2 percent of the mass of the titanium dioxide in the slurry during steam flow crushing, wherein the surface modifier consists of polysiloxane urethane acrylate and aluminum methacrylate-zirconium coupling agent in a mass ratio of 3:1, and obtaining the special rutile titanium dioxide for high-weatherability plastics.
The titanium dioxide prepared in the embodiment is tested for performance by a conventional method, wherein the rutile content is 97.21%, the particle size of the product is controlled to be D50=1.0-1.5 μm, D90=2.8 μm, the particle size distribution is narrow, the particle size distribution is uniform, the whiteness of the powder is 96.12%, and the water dispersibility is 98.61% (determined according to the method of patent CN 201410165452.5).
Example 2
A method for preparing special rutile titanium dioxide for high-weather-resistance plastics comprises the following steps:
(1) adding sulfuric acid with the mass 1.5 times of that of the titanium concentrate into the titanium concentrate for acidolysis to obtain a titanium suspension, adding a flocculating agent consisting of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminum chloride with the mass ratio of 4:3:1 into the titanium suspension for impurity removal, wherein the adding amount of the flocculating agent is 1.5 percent of that of the titanium concentrate, standing, pumping out the upper half part of a clear liquid, conveying the upper half part into a primary pressure filter, adding an adsorbent with the mass 1.0 percent of that of the titanium concentrate, wherein the adsorbent consists of diatomite and a zeolite molecular sieve with the mass ratio of 1:3, performing pressure filtration, performing solid-liquid separation, allowing the liquid after the pressure filtration to enter a vacuum crystallization system, removing ferrous sulfate heptahydrate through a disc separator, and adding the adsorbent with the mass 0.5 percent of the titanium concentrate for secondary pressure filtration to obtain a refined;
(2) adding water into the refined titanium liquid to adjust the refined titanium liquid to 350g/L, heating to 96 ℃, stirring, adding rutile seed crystal accounting for 2.5 percent of the dry basis weight of titanium dioxide in the refined titanium liquid and a crystal form control agent accounting for 0.6 percent of the dry basis weight of titanium dioxide in the refined titanium liquid, wherein the crystal form control agent consists of sodium tartrate, disodium ethylene diamine tetraacetate and poly-sulfonated ethyleneimine in a mass ratio of 4:1: 1; heating to boiling, stopping heating for 40min, heating again to boiling, and keeping the temperature and the micro pressure for 5h to obtain a hydrolysate;
(3) controlling the water pressure of the hydrolysate to be 0.50MPa, washing the hydrolysate with water at the flow rate of 25 square/min until the content of iron ions is below 150ppm, adding sulfuric acid for bleaching, and washing the hydrolysate with water for the second time until the content of iron ions is below 50ppm to obtain slurry;
(4) adding a dispersing agent accounting for 0.8 percent of the mass of the titanium dioxide in the slurry and a zirconium sulfate treating agent accounting for 0.8 percent of the weight of the zirconium oxide into the slurry, uniformly stirring, carrying out filter pressing on the slurry by a filter press until the solid content is 50 percent, then transferring a filter cake to a kiln for calcination, wherein the calcination is carried out by heating to 320 ℃, keeping the temperature for 1.0 hour, heating to 450 ℃, keeping the temperature for 1.5 hours, heating to 650 ℃, keeping the temperature for 2.5 hours, cooling, grinding, crushing by a steam-powder crusher, adding a surface modifier accounting for 1.0 percent of the mass of the titanium dioxide in the slurry during steam flow crushing, wherein the surface modifier consists of polysiloxane urethane acrylate and aluminum methacrylate-zirconium coupling agent in a mass ratio of 4:1, and obtaining the special rutile titanium dioxide for plastics with high weather resistance.
The titanium dioxide prepared by the embodiment is tested by a conventional method, the rutile content is 96.42%, the particle size of the product is controlled to be D50=1.0-1.5 μm, D90=2.8 μm, the particle size distribution is narrow, the particle size distribution is uniform, the whiteness of the powder is 97.34%, and the water dispersibility is 97.24%.
Example 3
A method for preparing special rutile titanium dioxide for high-weather-resistance plastics comprises the following steps:
(1) adding sulfuric acid with the mass being 2 times of that of the titanium concentrate into the titanium concentrate for acidolysis to obtain a titanium suspension, adding a flocculating agent consisting of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminum chloride with the mass ratio of 5:2:2 into the titanium suspension for impurity removal, wherein the adding amount of the flocculating agent is 1.8 percent of that of the titanium concentrate, standing, pumping out the upper half part of a clear liquid, conveying the upper half part of the clear liquid into a primary pressure filter, adding an adsorbent with the mass being 0.6 percent of that of the titanium concentrate, wherein the adsorbent consists of diatomite and a zeolite molecular sieve with the mass ratio of 1:1, performing pressure filtration, performing solid-liquid separation, feeding the liquid after the pressure filtration into a vacuum crystallization system, removing ferrous sulfate heptahydrate through a disc separator, and adding the adsorbent with the mass being 0.5 percent of that of the titanium concentrate;
(2) adding water into the refined titanium liquid to adjust the refined titanium liquid to 450g/L, heating to 96 ℃, stirring, adding rutile seed crystal accounting for 4.0 percent of the dry basis weight of titanium dioxide in the refined titanium liquid and a crystal form control agent accounting for 0.5 percent of the dry basis weight of titanium dioxide in the refined titanium liquid, wherein the crystal form control agent consists of sodium tartrate, disodium ethylene diamine tetraacetate and polyethylene imine sulfonate in a mass ratio of 7:2: 1; heating to boiling, stopping heating for 40min, heating again to boiling, and keeping the temperature and the micro pressure for 5h to obtain a hydrolysate;
(3) controlling the water pressure of the hydrolysate to be 0.40MPa, washing the hydrolysate with water at the flow rate of 25 square/min until the content of iron ions is below 150ppm, adding sulfuric acid for bleaching, and washing the hydrolysate with water for the second time until the content of iron ions is below 50ppm to obtain slurry;
(4) adding a dispersing agent accounting for 1.2 percent of the mass of the titanium dioxide in the slurry and a zirconium sulfate salt treating agent accounting for 0.8 percent of the mass of the titanium dioxide in the slurry by the weight of zirconium oxide into the slurry, uniformly stirring, carrying out filter pressing on the slurry by a filter press until the solid content is 50 percent, then transferring a filter cake to a kiln for calcination, wherein the calcination is carried out by heating to 350 ℃, keeping the temperature for 1.0 hour, heating to 450 ℃, keeping the temperature for 1.0 hour, heating to 650 ℃, keeping the temperature for 2.5 hours, cooling, grinding, crushing by a steam-powder crusher, adding a surface modifier accounting for 1.5 percent of the mass of the titanium dioxide in the slurry during steam flow crushing, wherein the surface modifier consists of polysiloxane urethane acrylate and aluminum methacrylate-zirconium coupling agent in a mass ratio of 2:1, and obtaining the special rutile titanium dioxide for high-weatherability plastics.
The performance of the titanium dioxide prepared by the embodiment is detected by a conventional method, the rutile content is 97.5%, the particle size of the product is controlled to be D50=1.0-1.5 μm, D90=2.5 μm, the particle size distribution is narrow, the particle size distribution is uniform, the whiteness of the powder is 98.46%, and the water dispersibility is 98.73%.
The rutile titanium dioxide prepared in the embodiment 1-3 is tested for weather resistance, and the detection method comprises the following steps: uniformly mixing the primary titanium dioxide powder with PP resin according to a mass ratio of 1:5, performing injection molding by using an injection molding machine to form a plastic plate, irradiating by using QUV, measuring L, a and b values of a sample plate irradiated at different time by using a color difference meter, and calculating the color difference delta E according to the following formula, wherein the larger the delta E is, the poorer the weather resistance of the sample plate is. The test results are shown in table 1.
Table 1: weather resistance test result of titanium dioxide applied to plastics
Wherein comparative example 1 is a commercially available rutile titanium dioxide product, and comparative document 2 is a product obtained by preparing rutile titanium dioxide according to method example 1 without surface modification. The test result shows that the rutile titanium dioxide prepared by the method has excellent weather resistance.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.
Claims (10)
1. A method for preparing special rutile titanium dioxide for high-weatherability plastics is characterized by comprising the following steps: the method comprises the following steps:
(1) adding sulfuric acid into the titanium concentrate for acidolysis to obtain a titanium suspension, adding a flocculating agent consisting of maleic anhydride-styrene sulfonic acid copolymer, sodium lignosulfonate and polyaluminium chloride into the titanium suspension for impurity removal, standing, pumping out the upper half part of a clear liquid, conveying the upper half part into a primary pressure filter, adding an adsorbent, performing pressure filtration, performing solid-liquid separation, allowing the liquid after pressure filtration to enter a vacuum crystallization system, removing ferrous sulfate heptahydrate through a disc separator, and adding the adsorbent for secondary pressure filtration to obtain a refined titanium liquid;
(2) adding water into the refined titanium liquid to adjust the refined titanium liquid to 300-500 g/L, heating to 96 ℃, stirring, adding rutile seed crystal with the titanium dioxide dry basis mass of 2-4% and a crystal form control agent with the titanium dioxide dry basis mass of 0.5-1.0% in the refined titanium liquid, wherein the crystal form control agent consists of sodium tartrate, disodium ethylene diamine tetraacetate and poly-sulfonated ethylene imine; heating to boil, stopping heating for 30-60min, heating to boil for the second time, and maintaining the temperature and the micro pressure for 4-5h to obtain hydrolysate;
(3) washing the hydrolysate with water until the content of iron ions is below 150ppm, adding sulfuric acid for bleaching, washing with water for the second time until the content of iron ions is below 50ppm to obtain slurry;
(4) adding a dispersing agent and a zirconium sulfate salt treating agent into the slurry, uniformly stirring, carrying out filter pressing on the slurry by a filter press, then calcining a filter cake in a rotary kiln, cooling, grinding into powder, crushing by a steam powder crusher, adding a surface modifier during steam flow crushing, wherein the surface modifier consists of polysiloxane urethane acrylate and an aluminum methacrylate-zirconium coupling agent, and obtaining the special rutile titanium dioxide for the high-weatherability plastic.
2. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 1, wherein the method comprises the following steps: the dispersing agent consists of sodium lignosulphonate, polyoxyethylene abietic acid monoester sodium sulfonate and polyacrylic acid ammonium salt.
3. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 2, which is characterized in that: the mass ratio of sodium lignosulfonate to polyoxyethylene abietic acid monoester sodium sulfonate to polyacrylic acid ammonium salt in the dispersant is 3-5:0.5-2: 1-3; the addition amount is 0.5-1.5% of the dry mass of the titanium dioxide in the refined titanium liquid.
4. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 1, wherein the method comprises the following steps: the mass ratio of the maleic anhydride-styrene sulfonic acid copolymer, the sodium lignosulfonate and the polyaluminium chloride in the flocculant is 3-5:1-3:1, and the adding amount of the maleic anhydride-styrene sulfonic acid copolymer, the sodium lignosulfonate and the polyaluminium chloride is 1-2% of the mass of the titanium concentrate.
5. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 1, wherein the method comprises the following steps: the adsorbent consists of diatomite and a zeolite molecular sieve in a mass ratio of 1: 1-3; the adding amount of the adsorbent is 0.8-1.5% of the mass of the titanium concentrate.
6. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 1, wherein the method comprises the following steps: the mass ratio of the sodium tartrate, the disodium ethylene diamine tetraacetate and the polysulfonated polyethyleneimine in the crystal form control agent is 4-8:1-3: 1.
7. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 1, wherein the method comprises the following steps: the adding amount of the zirconium sulfate is 0.5-1.0% of the mass of the titanium dioxide in the slurry based on the weight of the zirconium oxide.
8. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 1, wherein the method comprises the following steps: the addition amount of the surface modifier is 0.8-1.5% of the mass of the titanium dioxide in the slurry; the mass ratio of the polysiloxane urethane acrylate to the aluminum methacrylate-zirconium coupling agent is 3-5: 1.
9. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 1, wherein the method comprises the following steps: the water pressure of the water washing is controlled to be 0.4-0.5MPa, and the flow rate is controlled to be 20-25 square/min.
10. The method for preparing the special rutile titanium dioxide for the high-weatherability plastic according to claim 1, wherein the method comprises the following steps: the calcination is carried out by heating to 300-350 ℃, keeping the temperature for 0.5-1.0h, heating to 450-500 ℃, keeping the temperature for 1.0-1.5h, and then heating to 650-700 ℃ and keeping the temperature for 2-2.5 h.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115028198A (en) * | 2022-06-14 | 2022-09-09 | 安徽迪诺环保新材料科技有限公司 | Production method of titanium dioxide and photocatalytic self-cleaning ceramic |
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