Method for preparing microcapsule by using doping porous calcium carbonate mould plates

A technology of porous calcium carbonate and microcapsules, which is applied to the preparation of microcapsule preparations and microspheres, can solve the problems of time-consuming, many steps, limited promotion and application, etc., and achieves simple and fast preparation methods, good industrialization prospects, and material sources broad effect

Inactive Publication Date: 2007-02-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method has many steps, takes a long time, wastes raw materials, and the preparation process easily leads to the aggregation of particles and eventually forms aggregates of microcapsules
These shortcomings limit its promotion and application

Method used

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  • Method for preparing microcapsule by using doping porous calcium carbonate mould plates
  • Method for preparing microcapsule by using doping porous calcium carbonate mould plates
  • Method for preparing microcapsule by using doping porous calcium carbonate mould plates

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] 1) Mix 100mL of calcium nitrate solution with a concentration of 0.05M and 100mg of polystyrene sodium sulfonate (PSS) (PSS / [Ca 2+ ]=2g / mol), after 10 minutes, quickly add 100mL of sodium carbonate solution with a concentration of 0.05M, and ultrasonically vibrate for 10 seconds. After standing for 1 hour, the generated calcium carbonate containing PSS (expressed as CaCO 3 (PSS)) precipitate was collected by centrifugation and washed 3 times with water. Prepared CaCO 3 (PSS) particle diameter is about 5 microns, scanning electron microscope photos are shown in Figure 1a, b.

[0025] 2) Take an appropriate amount of the above CaCO 3 (PSS) microparticles were placed in a 2 mL centrifuge tube and washed 3 times with water. In 1 M NaCl solution, add 1 mL of polyallylamine hydrochloride (PAH) solution, shake the centrifuge tube. After 10 min, wash with water 3 times to remove excess PAH, thus the CaCO 3 (PSS) surface adsorbed a layer of PAH (expressed as CaCO 3 (PSS)-...

example 2

[0028] 1) prepare CaCO with the method of example 1 step 1) 3 (PSS), but the rest time is 2 minutes. Prepared CaCO 3 (PSS) particles are approximately 500 nm in diameter.

[0029] Step 2) and 3) are the same as step 2) and 3) of Example 1.

example 3

[0031] 1) prepare CaCO with the method of example 1 step 1) 3 (PSS), but the resting time is 4 hours. Prepared CaCO 3 (PSS) particles are approximately 20 microns in diameter.

[0032] Step 2) and 3) are the same as step 2) and 3) of Example 1.

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Abstract

The invention discloses a preparing method of micro-capsule through doping porous calcium carbonate mode, which comprises the following steps: reacting inorganic salt with calcium and inorganic salt with carbonate to prepare porous calcium carbonate colloid particle doped by negative charge electrolyte, adsorbing polyelectrolyte with positive charge on the colloid particle surface, decomposing diluted acid or complexing ethylenediamine tetra acetic acid to remove calcium carbonate particle, forming hollow micro-capsule through ionic bond action of positive and negative charge polyelectrolyte.

Description

technical field [0001] The invention relates to a method for preparing microcapsules, in particular to a method for preparing microcapsules by doping a porous calcium carbonate template. Background technique [0002] Microcapsules are substances that separate the space inside the capsule from the space outside the capsule to form a specific geometric structure by a film-forming substance. The shape of the microcapsules is mainly spherical, and can also be oval, square or rectangular, polygonal and various irregular shapes. The size of traditional microcapsules is usually on the order of microns to millimeters, and the wall thickness is from submicron to hundreds of microns. Microcapsules have very important applications in food, medicine, cosmetics, bioengineering and tissue engineering. [0003] There are many methods for the preparation of microcapsules. According to the principle of capsule wall formation, the traditional preparation techniques of microcapsules can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
Inventor 高长有王丰冯君仝维鋆
Owner ZHEJIANG UNIV
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