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Preparation method of calcium carbonate whisker with continuously controllable morphology

A calcium carbonate whisker and morphology technology, applied in the field of calcium carbonate whisker preparation, can solve the problems of low production cost and high cost hindering large-scale application, and achieve increased growth points, good chemical properties and mechanical properties, and effects strong effect

Active Publication Date: 2018-04-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Inorganic whiskers have a relatively complete structure and few defects, and their strength and modulus are close to the theoretical values ​​of complete crystals, and their flame retardancy is better than that of organic whiskers, so they become ideal reinforcing and toughening materials for composite materials, such as ZnO and SiC. , Potassium titanate, mullite, aluminum borate, etc. have been industrialized, but high cost has hindered large-scale application, while calcium carbonate whiskers have a wide range of raw materials and low production costs, and can even be prepared from industrial waste residues. Most Important Inorganic Whisker Materials

Method used

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  • Preparation method of calcium carbonate whisker with continuously controllable morphology
  • Preparation method of calcium carbonate whisker with continuously controllable morphology
  • Preparation method of calcium carbonate whisker with continuously controllable morphology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Add calcium oxide to deionized water to obtain Ca(OH) with a concentration of 0.1mol / L 2 Suspension, heated to 70°C at the same time, digested for 2h;

[0023] Step 2: Weigh magnesium chloride as the crystal form control agent, make the ratio of magnesium to calcium 1:1, add water to dissolve, and add the magnesium chloride solution to the digested Ca(OH) 2 In the suspension, stir for 0.5h to make it uniform; Step 3: use a three-neck round bottom flask, and pass CO2 through the openings on both sides at a flux of 150ml / min 2 Gas to the bottom of the reaction device for carbonation reaction;

[0024] Step 4: After the carbonization reaction was carried out for 2 hours, the obtained precipitate was suction-filtered, washed, and dried to obtain a sample.

[0025] The number of branches of the prepared calcium carbonate whiskers is mainly 4, and its SEM image is shown in figure 1 .

Embodiment 2

[0027] Step 1: Add calcium oxide to deionized water to obtain Ca(OH) with a concentration of 0.2mol / L 2 Suspension, heated to 80°C at the same time, digested for 2 hours;

[0028] Step 2: Weigh magnesium chloride as the crystal form control agent, make the ratio of magnesium to calcium 2:1, add water to dissolve, and add the magnesium chloride solution to the digested Ca(OH) 2 In the suspension, stir for 0.5h to make it uniform; Step 3: use a three-necked round bottom flask, and pass CO2 through the openings on both sides at a flux of 100ml / min 2 Gas to the bottom of the reaction device for carbonation reaction;

[0029] Step 4: The carbonization reaction ends after 2.5 hours, and the obtained precipitate is suction filtered, washed, and dried to obtain a sample.

[0030] The number of branches of the prepared calcium carbonate whiskers is mainly about 7, and the SEM image is shown in figure 2 .

Embodiment 3

[0032] Step 1: Add calcium oxide to deionized water to obtain Ca(OH) with a concentration of 0.3mol / L 2 Suspension, heated to 100°C at the same time, digested for 2 hours;

[0033] Step 2: Weigh magnesium chloride as the crystal form control agent, make the ratio of magnesium to calcium 2.5:1, add water to dissolve, and add the magnesium chloride solution to the digested Ca(OH) 2 In the suspension, stir for 0.5h to make it uniform;

[0034] Step 3: Using a three-neck round bottom flask, inject CO from both sides at a flow rate of 60ml / min 2 Gas to the bottom of the reaction device for carbonation reaction;

[0035] Step 4: The carbonization reaction is completed after 3 hours, and the obtained precipitate is suction filtered, washed, and dried to obtain a sample.

[0036] The number of branches of the prepared calcium carbonate whiskers can be as high as 16, and the SEM images of the whiskers are shown in image 3 .

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Abstract

The invention discloses a preparation method of a calcium carbonate whisker with continuously controllable morphology. The preparation method comprises the following steps of firstly, adding calcium oxide into deionized water, and digesting at certain temperature; then, adding a crystal form control agent, uniformly stirring, and enabling a double-pipe air ventilating device to lead carbon dioxidegas at certain flow rate to perform carbonation reaction; finally, sucking and filtering the obtained suspension liquid, washing, and drying, so as to obtain a sample. The preparation method has thecharacteristics that the prepared multi-arm whisker is the calcium carbonate whisker with novel morphology, and the number of whisker branches can be controlled through reaction conditions; the whisker is used as a filling material of the composite material, the chemical property and mechanical property are improved, and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic materials, in particular to a method for preparing calcium carbonate whiskers with continuous and controllable morphology. Background technique [0002] Inorganic whiskers have a relatively complete structure and few defects, and their strength and modulus are close to the theoretical values ​​of complete crystals, and their flame retardancy is better than that of organic whiskers, so they become ideal reinforcing and toughening materials for composite materials, such as ZnO and SiC. , Potassium titanate, mullite, aluminum borate, etc. have been industrialized, but high cost has hindered large-scale application, while calcium carbonate whiskers have a wide range of raw materials and low production costs, and can even be prepared from industrial waste residues. The most important inorganic whisker material. [0003] At present, scholars at home and abroad have done a lot of resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B29/62C30B7/14
CPCC30B7/14C30B29/22C30B29/62
Inventor 王宗荣李庆蕾刘剑王珊田薇杜丕一
Owner ZHEJIANG UNIV
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