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Method for preparing nano calcium carbonate with chitinase as crystal form control agent

A technology of nano-calcium carbonate and crystal form control agent, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., to achieve the effect of good promotion and application prospects and simple production process operation

Active Publication Date: 2019-12-10
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At home and abroad, there is no method for preparing nano-calcium carbonate by using chitinase as a crystal form control agent

Method used

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  • Method for preparing nano calcium carbonate with chitinase as crystal form control agent
  • Method for preparing nano calcium carbonate with chitinase as crystal form control agent
  • Method for preparing nano calcium carbonate with chitinase as crystal form control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 single factor experiment determines the optimum level under each factor

[0029] CaCl 2 Concentration, carbonization temperature, pH, and carbonization time are the main factors affecting the conversion rate of calcium ions. Change one of the factors one by one, fix the other factors to carry out the carbonization experiment, use the conversion rate of calcium ion as an investigation index, and determine the optimal level of each factor.

[0030] 1-1 Effect of carbonization temperature on calcium ion conversion rate

[0031] Prepare 1mol / L CaCl with anhydrous calcium chloride 2 solution, adjust the pH to 11 with ammonia water during the preparation process, and adjust the pH to 50mL after the pH adjustment. Take 30mLCaCl 2 The solution was placed in a beaker, and CO 2 Gas, CO controlled during ventilation 2 The flow rate is 1L / min, the ventilation time is 5min, and magnetic stirring is carried out at a certain water bath temperature. The filtrate and...

Embodiment 2

[0044] Embodiment 2 Orthogonal experiments determine optimal production process

[0045] 2-1 Formulation of orthogonal table

[0046] According to the optimal reaction conditions determined by the single factor method, A (carbonization temperature / °C), B (carbonization time / min), C (pH), D (CaCl 2 Concentration / mol / L) Carry out orthogonal experiment, each factor selects three levels near the optimal condition, refer to L 9 (4 3 ) Orthogonal table to formulate an orthogonal experiment table (Table 1).

[0047] The actual output value and Ca of the product under different reaction conditions in table 1 2+ Conversion rate

[0048]

[0049]

[0050] 2-2 Orthogonal experiment

[0051] According to the established orthogonal table, the experiment adopts the carbonization method to prepare nano-calcium carbonate. The specific preparation method is as follows: according to the conditions of each test number, prepare CaCl with anhydrous calcium chloride 2 solution 50mL, adj...

Embodiment 3

[0055] Embodiment 3 does not add chitinase to prepare calcium carbonate

[0056] Use anhydrous calcium chloride to prepare CaCl with a concentration of 1mol / L and a pH of 12.5 2 Solution 50mL. Take 30mL CaCl 2 solution, into CO 2 During the reaction, the reaction temperature was controlled at 35° C., the reaction time was 6 min, and magnetic stirring was added during the reaction. Collect the filtrate and the reaction product, wash the reaction product thoroughly, and dry it to a constant weight with a constant temperature blast drying oven, weigh it, and calculate the calcium ion conversion rate.

[0057] Use a scanning electron microscope (SEM) to observe the morphology and characteristics of nano-calcium carbonate. The specific operation is as follows: directly stick the conductive adhesive on the copper sheet, and the sample to be tested is directly scattered on the conductive double-sided adhesive with the help of foreign objects, and blow gently with the ear cleaning ...

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Abstract

The invention discloses a method for preparing nano calcium carbonate with chitinase as a crystal form control agent. The method includes the following steps: (1) a CaCl2 solution with the concentration being 0.9-1.1 mol / L and the pH being 11.5-12.5 is prepared through anhydrous calcium chloride; (2) a chitinase solution is added into the CaCl2 solution, then CO2 gas is introduced into a reactionsystem, a reaction is conducted under the magnetic stirring condition, the reaction temperature is controlled to be 25-35 DEG C, and the reaction time is 5-6 min; and (3) reaction products are collected, fully washed and then dried by a constant-temperature air dry oven to the constant weight, and thus the nano calcium carbonate is obtained. By adopting the chitinase as the crystal form control agent, particles of the nano calcium carbonate are smaller and more uniform, and the production process is easy to operate and environmentally friendly, and has great application and promotion prospects.

Description

technical field [0001] The invention relates to the technical field of preparation of nano-calcium carbonate, in particular to a method for preparing nano-calcium carbonate by using chitinase as a crystal form control agent. Background technique [0002] The scientific name of nano-calcium carbonate is ultra-fine calcium carbonate, with a particle size of 1-100nm. It is a new type of material developed in the past 30 years. Due to the ultra-fineness of nano-calcium carbonate, its crystal structure and surface electronic structure change, resulting in quantum size effect, small size effect, surface effect and macroscopic quantum effect that ordinary calcium carbonate does not have. Its unique properties make It is widely used in rubber, plastic, paper, food and other industries. Adding nano-calcium carbonate to the production process of rubber materials and plastics not only improves the surface finish of rubber products but also improves the toughness, tear resistance, tens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y30/00B82Y40/00
CPCC01F11/183B82Y30/00B82Y40/00C01P2004/03C01P2004/32C01P2004/61C01P2004/64
Inventor 谢晓兰孙丽丹吕凤娇翁文婷
Owner QUANZHOU NORMAL UNIV