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Preparation method of nano calcium carbonate/titanium dioxide composite powder with core-shell structure

A nano-calcium carbonate, titanium dioxide technology, applied in titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of low stability of composite particles, large particle size of titanium dioxide, affecting coating effect, etc. The effect of strong absorption capacity, high whiteness value and short duration

Active Publication Date: 2014-09-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the reaction is completed, the particle size of titanium dioxide loaded on the surface of calcium carbonate is relatively large, which limits its wide application in papermaking, plastics and other fields, and the stability of the composite particles is not high, and TiO 2 Incomplete coverage and easy to fall off, affecting the coating effect

Method used

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  • Preparation method of nano calcium carbonate/titanium dioxide composite powder with core-shell structure
  • Preparation method of nano calcium carbonate/titanium dioxide composite powder with core-shell structure
  • Preparation method of nano calcium carbonate/titanium dioxide composite powder with core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Calcium oxide (CaO) was calcined in a muffle furnace at 800°C for 2 hours; after cooling the calcined CaO, prepare Ca(OH) with a mass fraction of 7%. 2 solution, that is, take 5.6g CaO and add it to 500mL water for 12 hours; take a 200-mesh sieve to filter the digested solution, and take the filtrate for later use. Place the filtrate in a cold water bath to keep its temperature lower than 19°C; take the filtrate and place it in a large-mouth quartz tube, check the connection line, and first pass through the N 2 CO 2 , into N 2 The gas flow rate is 60L / h, and CO 2 The flow rate of the gas is 30L / h. After the gas is stably reacted, the gas flow rate can be increased to ensure that V N2 :V CO2 = 2:1; when the pH of the reactant is detected by pH test paper = 7, the flow rate is lowered at this time, V N2 =60L / h, V CO2 =30L / h, when the pH=6 is the end of the reaction, at this time, the gas is closed, and the CO is closed first 2 , after closing N 2 gas, the prepared...

Embodiment 2

[0039] Dissolve 0.072g of titanium sulfate 1 in 10g of distilled water 1 to obtain an impregnating solution; add 1g of calcium carbonate to the impregnating solution, vibrate at room temperature for 30min, then filter with suction, wash with distilled water until the filtrate is washed with BaCl 2 Detect that no precipitation is generated, and the pre-product is obtained; 2.88g of titanium sulfate 2 is dissolved in 10.92g of distilled water 2 to obtain an aqueous solution of titanium sulfate; 0.8g of the pre-product and 6g of urea are dissolved in 44.5g of distilled water 3, and 0.0020g of dodecane is added Sodium phenylsulfonate, at 80°C under stirring conditions, add the titanium sulfate aqueous solution dropwise, control the flow rate of the titanium sulfate aqueous solution to about 4mL / h, continue the reaction for 30-60min after the dropwise addition, stop the reaction, and cool , suction filtration, washing until the filtrate was washed with BaCl 2 No precipitation was d...

Embodiment 3

[0044] Change the amount of titanium sulfate 1 to 0.288g to prepare the impregnating solution, change the amount of distilled water 1 to 19.7g, change the amount of sodium dodecylbenzenesulfonate to 0.0010g, and use 90°C as the reaction temperature. The amount of 2 was changed to 1.68g, and the amount of distilled water 2 was changed to 6.37g to prepare an aqueous solution of titanium sulfate, and the rate of addition was adjusted to 2mL / h instead, and Example 2 was repeated to obtain nano-CaCO with a core-shell structure. 3 / TiO 2 Composite powder, its XRD pattern is shown in Figure 5 .

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Abstract

The invention discloses a preparation method of nano calcium carbonate / titanium dioxide composite powder with a core-shell structure, belonging to the technical field of inorganic chemical synthesis. The preparation method for preparing the nano-level CaCO3 / TiO2 composite powder with the core-shell structure comprises the steps of leaching calcium carbonate by using a low-concentration titanium sulfate solution, then mixing leached calcium carbonate with a urea solution, and gradually dripping a high-concentration titanium sulfate solution or titanyl sulfate solution under heating conditions by using sodium dodecyl benzene sulfonate as a dispersing agent, thus preparing the nano CaCO3 / TiO2 composite powder with the core-shell structure. The preparation method is simple and feasible; an obtained product is relatively small and uniform in granularity and strong in ultraviolet absorption ability, shows the properties of titanium dioxide on the surface to a large extent, can be widely applied to the field of paper-making filler, coatings and the like, also can be used as an ultraviolet shielding material, and can be used for effectively reducing the cost of materials.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical synthesis, in particular to a method for preparing nano calcium carbonate / titanium dioxide composite powder with a core-shell structure. Background technique [0002] Calcium Carbonate (CaCO 3 ) is one of the most abundant inorganic minerals on the earth. As an important inorganic filler, calcium carbonate is widely used in rubber, Industrial fields such as plastics, paper making, coatings, ceramics, cosmetics, toothpaste, food, medicine and bionic materials. Calcium carbonate can improve the opacity and brightness of the paper, ensure the strength of the paper, and has high shielding properties, less wear on the paper machine, and makes the produced paper products more smooth and uniform. [0003] Titanium dioxide (TiO 2 ) is a white inorganic pigment that exists in nature in three crystal forms: anatase structure, rutile structure and brookite structure. It is non-toxic, has the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C1/36C09C3/06C09C3/08C01G23/053
Inventor 赵旭陶红朱燕超
Owner JILIN UNIV
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