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Preparing method for chain superfine hydrofil

An ultra-fine calcium carbonate, chain technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of increased aspect ratio, unfavorable production efficiency, etc., to achieve the effect of non-toxic raw materials and safe operation

Inactive Publication Date: 2004-04-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aspect ratio of the product is increased, and the axial dimension can be reduced to less than 20nm, but since the carbonization process is completed in two steps, it is not conducive to the improvement of production efficiency

Method used

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  • Preparing method for chain superfine hydrofil
  • Preparing method for chain superfine hydrofil
  • Preparing method for chain superfine hydrofil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The prepared solid content is 5gCaO / 100mlH 2 O milk of lime 100ml, control the temperature at 23°C, before the reaction starts, dissolve 0.34g of EDTA2Na in 10ml of water, add to the reaction system, stir for 40min and then feed CO at a flow rate of 65-70mL / min 2 Gas, add 4ml of aqueous solution containing 0.055g PVP dispersant to the reaction system when the reaction is carried out to 15min, add 0.025g / nL CaCl when the reaction is carried out to 40min 2 2 mL of aqueous solution, and the reaction was completed when the pH was 6-7. XRD analysis showed that the obtained CaCO 3 For the calcite phase. After drying at 100°C, chain-like ultrafine calcium carbonate is obtained, and the transmission electron microscope photo is as follows: figure 1 As shown, its axial dimension is about 20 nm, and its aspect ratio is about 11:1.

Embodiment 2

[0020] The prepared solid content is 5gCaO / 100mlH 2 O milk of lime 100ml, control the temperature at 23°C, before the reaction starts, dissolve 0.34g of EDTA2Na in 10ml of water, add to the reaction system, stir for 40min and then feed CO at a flow rate of 65-70mL / min 2 Gas, add 1ml of AE0-3 dispersant 1ml when the reaction is 15min, add 0.025g / mL CaCl when the reaction is 40min 2 2 mL of aqueous solution, and the reaction was completed when the pH was 6-7. After drying at 100°C, chain-like ultrafine calcium carbonate is obtained, with an axial dimension of about 30nm and an aspect ratio of about 10:1, but its dispersion effect is not as good as that of Example 1.

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Abstract

A process for preparing superfine chain-shaped calcium carbonate features use of the composite form controlling agent composed of 3 assistants, and one-step carbonization reaction by intermittent bubbling. The resultant calcium carbonate has 20 nm for axial size and 11:1 for length to diameter ratio.

Description

technical field [0001] The invention relates to a preparation method of ultrafine calcium carbonate with a chain shape. Background technique [0002] Chain ultrafine calcium carbonate is a nano calcium carbonate product with one-dimensional morphology. Compared with traditional heavy calcium and light calcium, chain-like ultrafine calcium carbonate has an excellent reinforcing effect on natural rubber and synthetic rubber. It can be used as a reinforcing filler to partially replace carbon black or white carbon black, greatly reducing costs, and When chain calcium carbonate is used as an additive in coatings, papermaking, and plastics industries, it also exhibits excellent performance and has broad application prospects. [0003] The research on the preparation process of chain calcium carbonate is mostly found in Japanese patents. Japanese patents (Show 45-31851, Show 47-22944, Show 50-33995) generally adopt sulfuric acid, magnesium sulfate, calcium sulfate, etc. at a speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
Inventor 曹维良王泽张敬畅
Owner BEIJING UNIV OF CHEM TECH
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