Titanium dioxide slurry, modified dispersant and preparation and application thereof

Abstract

The invention discloses a titanium dioxide slurry, a modified dispersant and a preparation method and application thereof, and the preparation method of the modified dispersant comprises the following steps: adding an organic dispersant into an ethanol aqueous solution, and uniformly mixing to obtain a mixed solution; enabling the mixed solution to penetrate through a membrane emulsifier to obtain a first mixture; mixing the first mixture with deionized water to obtain a second mixture; and adding an inorganic dispersant into the second mixture, and uniformly mixing to obtain the modified dispersant. The titanium dioxide dispersion agent is used for dispersing a titanium dioxide primary product, and in obtained titanium dioxide slurry, the concentration of titanium dioxide is 500-550 g / L; when the temperature is 25 DEG C, the viscosity of the slurry is 4.52-10.77 in 5 minutes; the viscosity of the slurry in 30 minutes is 5.17 to 10.76; the viscosity of the slurry in 60 minutes is 5.16 to 9.77. The dispersing agent is creatively made to penetrate through the membrane emulsifier, the physical property state of the dispersing agent is improved, the uniform and stable small-diameter dispersing agent liquid drop mixed liquid is prepared, the wetting and dispersing performance of the dispersing agent is greatly improved, rapid wetting and dispersing are achieved in the titanium dioxide dispersing process, and the dispersing and stabilizing time is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of titanium dioxide, and in particular to a titanium dioxide slurry, a modified dispersant, and a preparation method and application thereof. Background Art

[0002] Titanium dioxide has the advantages of stable chemical properties, high whiteness, high hiding power, etc., and is widely used in the fields of coatings, plastics, papermaking and electronic materials. 2 The particles themselves agglomerate seriously, resulting in a high viscosity of the slurry. In the production process, dispersants are often added as a dispersion method to reduce the viscosity of TiO 2 The van der Waals force between particles or the enhanced electrostatic repulsion can reduce the surface energy of titanium dioxide, control the particle size, and improve the dispersion state of the slurry. The dispersion state of titanium dioxide by dispersants is of great significance in industrial production and application, and directly affects the quality and performance of the product.

[0003] The dispersion process of titanium dioxide in liquid phase can be divided into three steps: wetting, dispersion and stabilization. At present, in the process of using organic dispersants to disperse titanium dioxide, there are often problems such as large fluctuations in the viscosity value of the dispersion index; at the same addition ratio of dispersants, the dispersion performance of slurries of different concentrations varies greatly. In the screening of the types and dosages of dispersants for titanium dioxide, errors are prone to occur and the efficiency is low. This is closely related to the wetting properties of the dispersant. Different dispersants have different wetting properties on substances, resulting in differences in the wetting process time and inconsistent dispersion stabilization time.

[0004] Based on this, the existing technology still needs to be improved. Summary of the invention

[0005] In order to solve the above technical problems, the embodiments of the present invention provide a titanium dioxide slurry, a modified dispersant, and a preparation method and application thereof to solve the technical problems existing in the titanium dioxide dispersion technology of the prior art.

[0006] To solve the above technical problems, on the one hand, some embodiments of the present invention disclose a method for preparing a modified dispersant, comprising: Step 1: adding an organic dispersant to an ethanol aqueous solution and mixing them evenly to obtain a mixed solution; Step 2: passing the mixed solution through a membrane emulsifier to obtain a first mixture; Step 3: mixing the first mixture with deionized water to obtain a second mixture; Step 4: Add an inorganic dispersant to the second mixture and mix them evenly to obtain a modified dispersant.

[0007] In some embodiments, the pore size of the membrane emulsifier is 0.1-0.15 microns.

[0008] In some embodiments, the inorganic dispersant is sodium silicate or sodium hexametaphosphate.

[0009] In some embodiments, in step 1, the mass ratio of the organic dispersant to the ethanol aqueous solution is 1:1-1:10.

[0010] In some embodiments, the ethanol aqueous solution is 10±5% ethanol aqueous solution by volume percentage.

[0011] In some embodiments, the organic dispersant is a terpolymer or a tetrapolymer.

[0012] On the other hand, some embodiments of the present invention further disclose a modified dispersant, which is prepared by the aforementioned preparation method of the modified dispersant, and the particle size of the microspheres is 0.3 μm-0.5 μm.

[0013] In a third aspect, some embodiments of the present invention further disclose a method for improving the wetting performance of a dispersant on titanium dioxide, which uses the aforementioned modified dispersant to treat the primary titanium dioxide product.

[0014] In some embodiments, in the modified dispersant, the amount of the organic dispersant added is 0.2%-0.4% of the initial mass of titanium dioxide, and the amount of the inorganic dispersant added is 0.2%-0.4% of the initial mass of titanium dioxide, calculated by mass content.

[0015] In addition, some embodiments of the present invention further disclose a titanium dioxide slurry, which is prepared by the aforementioned method for improving the wetting performance of the dispersant on titanium dioxide, wherein the concentration of titanium dioxide is 500-550 g / L; Moreover, when the temperature is 25°C, the 5-min slurry viscosity is 4.52-10.77; the 30-min slurry viscosity is 5.17-10.76; and the 60-min slurry viscosity is 5.16-9.77.

[0016] By adopting the above technical solution, the present invention has at least the following beneficial effects: The present invention provides a titanium dioxide slurry, a modified dispersant, and a preparation method and application thereof, which innovatively passes the dispersant through a membrane emulsifier to improve its physical properties, prepare a uniform and stable small-diameter dispersant droplet mixture, greatly improve the wetting and dispersing performance of the dispersant, achieve rapid wetting and dispersion in the process of dispersing titanium dioxide, and shorten the dispersion stabilization time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The present invention is a flowchart of a method for preparing a modified dispersant disclosed in some embodiments of the present invention. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0020] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0021] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0023] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0024] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0025] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0026] like Figure 1 As shown, some embodiments of the present invention disclose a modified dispersant and a preparation method thereof, the preparation method comprising: Step 1: adding an organic dispersant to an ethanol aqueous solution and mixing them uniformly to obtain a mixed solution, wherein the organic dispersant may be a terpolymer or a tetrapolymer, the mass ratio of the organic dispersant to the ethanol aqueous solution is 1:1-1:10, preferably 1:10, and the ethanol aqueous solution is generally a 10% ethanol aqueous solution; Step 2: passing the mixed solution through a membrane emulsifier to obtain a first mixture, wherein the pore size of the membrane emulsifier is generally selected to be 0.1-0.15 microns in order to obtain better dispersant performance; Step 3: mixing the first mixture with deionized water to obtain a second mixture; Step 4: Add an inorganic dispersant to the second mixture and mix them evenly to obtain a modified dispersant, wherein the inorganic dispersant can be sodium silicate or sodium hexametaphosphate.

[0027] The modified dispersant obtained by this embodiment has a better physical property state, and is manifested as a uniform and stable mixture of small-diameter dispersant droplets. The modified dispersant in this physical state has greatly improved wetting and dispersing properties compared to the unmodified dispersant. During the titanium dioxide dispersion process, it can achieve rapid wetting and dispersion, which can effectively shorten the dispersion stabilization time of titanium dioxide.

[0028] Some embodiments of the present invention also disclose a method for improving the wetting performance of a dispersant on titanium dioxide, wherein the modified dispersant prepared in the above embodiment is used to treat the primary titanium dioxide product, wherein the amount of the organic dispersant added to the modified dispersant can be 0.2%-0.4%, preferably 0.3%, of the primary titanium dioxide product by mass content; and the amount of the inorganic dispersant added can be 0.2%-0.4% of the primary titanium dioxide product quality. The wetting performance of titanium dioxide can be effectively improved, and rapid wetting and dispersion can be achieved during the titanium dioxide dispersion process, which can effectively shorten the dispersion stabilization time of titanium dioxide.

[0029] Some embodiments of the present invention also disclose a titanium dioxide slurry, which includes a primary titanium dioxide product and the modified dispersant of the aforementioned embodiment, wherein the titanium dioxide concentration is 500-550g / L; and, when the temperature is 25°C, the 5-min slurry viscosity is 4.52-10.77; the 30-min slurry viscosity is 5.17-10.76; and the 60-min slurry viscosity is 5.16-9.77.

[0030] The preparation method thereof comprises: Step 1: adding an organic dispersant to an ethanol aqueous solution and mixing them uniformly to obtain a mixed solution, wherein the organic dispersant may be a terpolymer or a tetrapolymer, the mass ratio of the organic dispersant to the ethanol aqueous solution is preferably 1:10, and the ethanol aqueous solution is generally a 10% ethanol aqueous solution; Step 2: passing the mixed solution through a membrane emulsifier to obtain a first mixture, wherein the pore size of the membrane emulsifier is generally selected to be 0.1-0.15 microns in order to obtain better dispersant performance; Step 3: mixing the first mixture with deionized water to obtain a second mixture; Step 4: Add an inorganic dispersant to the second mixture and mix them evenly to obtain a modified dispersant, wherein the inorganic dispersant can be sodium silicate or sodium hexametaphosphate.

[0031] Embodiment 1 of the present invention: Take an organic dispersant (an acrylic acid-acrylate-phosphonic acid-sulfonate tetrapolymer) and add it to a 10% ethanol aqueous solution; the mass ratio of dispersant: ethanol aqueous solution is 1:10; the diluted organic dispersant is injected into a membrane emulsifier with a pressure range of 0.2-0.6MPa; take an appropriate amount of the mixed solution after passing through the membrane emulsifier and add it to deionized water; add an inorganic dispersant sodium silicate to the solution prepared above, stir, and obtain a modified dispersant. The microsphere particle size of the modified dispersant is .3μm-0.5μm. The modified dispersant is added to the titanium dioxide primary product for dispersion, wherein, in terms of mass content, the amount of organic dispersant added is 0.3% of the mass of titanium dioxide, and the amount of sodium silicate added is 0.3% of the mass of titanium dioxide. After stirring and mixing evenly, the final concentration of titanium dioxide is 500g / L. Stir for 1h to obtain a uniformly dispersed titanium dioxide slurry. The test results are shown in Table 1.

[0032] Embodiment 2 of the present invention: Take an organic dispersant (an acrylic acid-acrylate-sulfonate terpolymer:), add it to a 10% ethanol aqueous solution; the mass ratio of dispersant: ethanol aqueous solution is 1:10; inject the diluted organic dispersant into a membrane emulsifier; take an appropriate amount of the mixed solution after passing through the membrane emulsifier and add it to deionized water; add an inorganic dispersant sodium silicate to the solution prepared above, stir, and obtain a modified dispersant. The microsphere particle size of the modified dispersant is .3μm-0.5μm. Add the modified dispersant to the titanium dioxide primary product for dispersion, wherein, in terms of mass content, the amount of organic dispersant added is 0.3% of the mass of titanium dioxide, and the amount of sodium silicate added is 0.3% of the mass of titanium dioxide. After stirring and mixing evenly, the final concentration of titanium dioxide is 500g / L. Stir for 1H to obtain a uniformly dispersed titanium dioxide slurry. The test results are shown in Table 1.

[0033] Comparative Example 1 of the present invention: Titanium dioxide roller abrasive was selected and slurried with deionized water. The slurry concentration was 500 g / L, and an organic dispersant (the tetrapolymer in Example 1) was added in an amount of 0.3% of the mass fraction of titanium dioxide. A dispersant sodium silicate was added in an amount of 0.3% of the mass fraction of titanium dioxide. The mixture was stirred for 1 hour to obtain a dispersed titanium dioxide slurry. The test results are shown in Table 1.

[0034] Comparative Example 2 of the present invention: Take titanium dioxide roller abrasive and use deionized water for slurrying. The slurrying concentration is 500g / L, add organic dispersant (terpolymer in Example 2) in an amount of 0.3% of titanium dioxide mass fraction, add dispersant sodium silicate in an amount of 0.3% of titanium dioxide mass fraction, stir for 1H, and obtain dispersed titanium dioxide slurry. The test results are shown in Table 1.

[0035] Table 1

[0036] As can be seen from Table 1, the viscosity of the dispersed slurry obtained by the dispersants of Examples 1-2 after passing through the membrane emulsifier is lower than that of Comparative Examples 1-2, and the dispersing performance of the same dispersants in Examples 1-2 is better than that of Comparative Examples 1-2; the viscosity values ​​of Examples 1 and 2 are relatively stable at the three time points of 5min-60min of dispersion, and the change trend is not obvious; the viscosity values ​​of Comparative Examples 1 and 2 differ greatly after stirring for 5min and 60min, the viscosity decreases significantly, and the viscosity trend gradually decreases. This is because after the dispersant passes through the membrane emulsifier, the physical properties of the dispersant change, forming dispersant droplets with extremely fine particle size, uniform and stable, which significantly improves its wetting performance, can quickly wet and disperse titanium dioxide, and stabilize the dispersion state of the titanium dioxide slurry.

[0037] To sum up, the titanium dioxide slurry, modified dispersant, and preparation method and application thereof disclosed in the above embodiments of the present invention, by changing the state of the dispersant, innovatively use a membrane emulsifier to pre-prepare a uniform and stable small-diameter dispersant droplet mixture, thereby greatly improving the wetting and dispersing properties of the dispersant. In the subsequent process of dispersing titanium dioxide, rapid wetting and dispersion can be achieved, making the titanium dioxide slurry dispersed stably, easy to operate, and simple in form. It plays a significant role in improving the dispersion efficiency of the titanium dioxide back-end production process and improving product quality, and is of great significance to the improvement of the titanium dioxide back-end process efficiency and the quality of titanium dioxide in production sites and scientific research experiments.

[0038] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0039] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A method for preparing a modified dispersant, characterized in that: include: Step 1: adding an organic dispersant to an ethanol aqueous solution and mixing them evenly to obtain a mixed solution; Step 2: passing the mixed solution through a membrane emulsifier to obtain a first mixture; Step 3: mixing the first mixture with deionized water to obtain a second mixture; Step 4: Add an inorganic dispersant to the second mixture and mix them evenly to obtain a modified dispersant.

2. The method for preparing a modified dispersant according to claim 1, characterized in that: The pore size of the membrane emulsifier is 0.1-0.15 microns.

3. The method for preparing a modified dispersant according to claim 1, characterized in that: The inorganic dispersant is sodium silicate or sodium hexametaphosphate.

4. The method for preparing a modified dispersant according to claim 1, characterized in that: In step 1, the mass ratio of the organic dispersant to the ethanol aqueous solution is 1:1-1:

10.

5. The method for preparing a modified dispersant according to claim 1, characterized in that: In terms of volume percentage, the ethanol aqueous solution is 10±5% ethanol aqueous solution.

6. The method for preparing a modified dispersant according to claim 1, characterized in that: The organic dispersant is a terpolymer or a tetrapolymer.

7. A modified dispersant, characterized in that: The microspheres are prepared by the preparation method of the modified dispersant according to any one of claims 1 to 6, and the particle size of the microspheres is 0.3 μm to 0.5 μm.

8. A method for improving the wetting performance of a dispersant on titanium dioxide, characterized in that: The modified dispersant according to claim 7 is used to disperse the primary titanium dioxide product.

9. The method for improving the wetting performance of a dispersant on titanium dioxide according to claim 8, characterized in that: In the modified dispersant, the amount of the organic dispersant added is 0.2%-0.4% of the initial mass of titanium dioxide, and the amount of the inorganic dispersant added is 0.2%-0.4% of the initial mass of titanium dioxide, calculated by mass content.

10. A titanium dioxide slurry, characterized in that: The method for improving the wetting performance of the dispersant on titanium dioxide according to claim 8 or 9 is used, wherein the concentration of titanium dioxide is 500-550 g / L; Moreover, when the temperature is 25°C, the 5-min slurry viscosity is 4.52-10.77; the 30-min slurry viscosity is 5.17-10.76; and the 60-min slurry viscosity is 5.16-9.77.

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