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Quasi-hexagonal sheet calcium carbonate metastable-state crystal particle and method of preparing the same

A hexagonal flaky, calcium carbonate technology, applied in the direction of calcium carbonate/strontium/barium, inorganic compound addition, etc., can solve the problem of no pseudo-hexagonal flaky calcium carbonate particles, etc., to achieve saving pulp consumption, good coating ability and covering ability, good optical properties and the effect of printing properties

Inactive Publication Date: 2009-08-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, people use the principle of biomineralization to synthesize semiconductor materials, organic / inorganic composite ceramic films, etc. Patent 200410011083.0 synthesizes functional nano-calcium carbonate by biomimetic mineralization in-situ method, which has cubic and spindle shapes, but has not yet been adopted. A report on pseudo-hexagonal flaky calcium carbonate particles synthesized by biomimetic method

Method used

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  • Quasi-hexagonal sheet calcium carbonate metastable-state crystal particle and method of preparing the same
  • Quasi-hexagonal sheet calcium carbonate metastable-state crystal particle and method of preparing the same

Examples

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Effect test

Embodiment 1

[0025] Preparation of calcium lauryl sulfate: Dissolve 34g of calcium chloride in 200ml of deionized water, dissolve 100g of sodium lauryl sulfate in 800ml of deionized water, heat to above 60°C respectively, mix, gradually cool, wash, and filter , the product was recrystallized (dissolved above 60°C, cooled at room temperature, filtered), and vacuum-dried at 40°C.

[0026] Preparation of calcium carbonate particles: 50g containing 2.0wt% calcium lauryl sulfate, 1.5wt% n-amyl alcohol and an aqueous solution of a certain amount of ammonia, so that [NH 3 ]:[Ca 2+ ]=4:1. Pass CO into the solution at a rate of 2.5ml / min 2 Gas for 1 hour, stirring constantly during aeration, aging for 24 hours. The product was filtered, washed, and dried at room temperature for 24 hours. That is, pseudo-hexagonal flaky calcium carbonate metastable crystal (aragonite) particles are obtained.

Embodiment 2

[0028] Preparation of calcium dodecylsulfonate: Dissolve 34g of calcium chloride in 200ml of deionized water, dissolve 100g of sodium dodecylsulfonate in 800ml of deionized water, heat to above 60°C, mix, gradually cool, and wash , filtered, and the product was recrystallized (dissolved above 60°C, cooled at room temperature, filtered), and vacuum-dried at 40°C.

[0029] Preparation of calcium carbonate particles: 50g containing 2.0wt% calcium dodecylsulfonate, 1.5wt% n-butanol and an aqueous solution of a certain amount of ammonia, so that [NH 3 ]: [Ca 2+ ]=4:1. Pass CO into the solution at a rate of 2.5ml / min 2 Gas for 1 hour, stirring constantly during aeration, aging for 24 hours. The product was filtered, washed, and dried at room temperature for 24 hours. That is, pseudo-hexagonal flaky calcium carbonate metastable crystal (aragonite) particles are obtained.

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Abstract

The invention discloses a quasi-hexagonal flaky calcium carbonate metastable crystal form (aragonite) grain and a preparation method thereof. The grain is mainly quasi-hexagonal flake, and has narrow grain size distribution with average grain diameter of between 1 and 2 mu m. The method is to use a calcium salt system consisting of organic calcium salt (calcium dodecyl sulfate and the like), an organic additive (n-amyl alcohol and the like) and ammonia to react with carbon dioxide to generate the quasi-hexagonal flaky calcium carbonate metastable crystal form (aragonite) grain. The grain has strong capability of product surface coating and covering, is easy to disperse, and has excellent optical performance and printing performance, so that a paper product prepared by the grain has higher whiteness, brightness and shading performance, can save dosage of paper pulp, and can reduce cost of paper making.

Description

technical field [0001] The invention relates to a calcium carbonate particle and its preparation, in particular to a quasi-hexagonal flaky calcium carbonate metastable crystal form (aragonite) particle and a preparation method thereof. Background technique [0002] Biomineralization refers to the process of forming minerals in organisms, and its role is an extensive and complex physical and chemical process between solid phases, organic matter and inorganic matter. A small amount of organic matter is used as a template to carry out molecular operations and highly orderly combination into inorganic materials. The organic matrix can be used as an inert substrate for structural support or a limited space for mineral precipitation and the surface of nucleation to determine the shape, size, and size of mineral points. Spatial arrangement, crystallographic orientation, and polymorphic type, and together with biocrystals, determine the mechanical properties of biominerals, which ar...

Claims

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Application Information

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IPC IPC(8): C01F11/18D21H17/67
Inventor 沈强高艳艳王海花李新平刘凤麟
Owner SHANDONG UNIV
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