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Preparation method of microcapsule

A technology of microcapsules and silicon dioxide, applied in the field of microcapsules, can solve problems such as limited controllable range and limited application performance of microcapsules, so as to improve absorption and resistance to external pressure, prevent invagination and dissolution, good controllability

Inactive Publication Date: 2009-10-28
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microcapsules with this structure have a simple overall structure and only a thin layer of wall material on the surface, so the structural strength of the capsule and the sustained-release effect of the capsule can usually only be realized by adjusting the thickness of the wall material layer and the pore state of the wall material layer. The controllable range is relatively limited, which greatly limits the application performance of microcapsules

Method used

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  • Preparation method of microcapsule
  • Preparation method of microcapsule
  • Preparation method of microcapsule

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Add 0.2 g of acryloyloxy to 10.0 g of silica in styrene monomer suspension (the average particle diameter of the silica particles in the suspension is 30 nm, 2.0 g of silica, and 8.0 g of styrene). Propyltrimethoxysilane (MPS), stirred at 70°C for 1 hour in a closed state, added 0.10g of ethylene glycol dimethacrylate and 0.016g of azobisisobutyronitrile, stirred to fully dissolve, and then 1.0 g of dispersant calcium phosphate powder and 49.0 g of deionized water were added thereto to obtain a suspension system. After the above system was sheared and stirred at 300 rpm for 10 minutes under a nitrogen atmosphere, the temperature was raised to 60°C for suspension polymerization for 6 hours, and then heated to 95°C for aging for 1 hour, then cooled and pickled to obtain composite particle powder.

[0037] Soaking the composite particle powder in excess hydrofluoric acid for 24 hours to remove silicon dioxide in the composite particle, and then neutralizing, washing with w...

Embodiment 2

[0040] To 10.0g of silicon dioxide in methyl methacrylate monomer suspension (the average particle diameter of silicon dioxide particles in the suspension is 50nm, silicon dioxide is 1.0g, and methyl methacrylate is 9.0g) 0.2g of acryloyloxypropyltriethoxysilane, stirred at 40°C for 24 hours in a closed state, added 0.045g of ethylene glycol dimethacrylate and 0.18g of dibenzoyl peroxide, stirred to make it After fully dissolving, 0.09 g of dispersant magnesium carbonate powder and 99.0 g of deionized water were added thereto to obtain a suspension system. After the above system was sheared and stirred at 50 rpm for 10 minutes under a nitrogen atmosphere, the temperature was raised to 80°C for suspension polymerization for 2 hours, and then heated to 95°C for aging for 1 hour, then cooled and pickled to obtain composite particle powder.

[0041] Soaking the composite particle powder in excess hydrofluoric acid for 24 hours to remove silicon dioxide in the composite particle, a...

Embodiment 3

[0043] Add 0.2 g of acryloyloxypropane to 10.0 g of silica monomer suspension (the average particle diameter of the silica particles in the suspension is 200 nm, 4.0 g of silica, and 6 g of methyl methacrylate). Trimethoxysilane, stirred at 50°C for 10 hours in a closed state, added 0.24g ethylene glycol dimethacrylate, 0.06g dibenzoyl peroxide and 0.09g azobisisobutyronitrile, and stirred to make It was fully dissolved, and 1.2 g of dispersant calcium phosphate and 99.0 g of deionized water were added thereto to obtain a suspension system. After the above system was sheared and stirred at 100 rpm for 10 minutes under a nitrogen atmosphere, the temperature was raised to 70°C for suspension polymerization for 5 hours, and then heated to 95°C for aging for 1 hour, then cooled and pickled to obtain composite particle powder.

[0044] Soaking the composite particle powder in excess hydrofluoric acid for 24 hours to remove silicon dioxide in the composite particle, and then neutral...

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Abstract

The invention discloses a preparation method of a microcapsule, which comprises the steps of: uniformly mixing silicon dioxide particles, monomer provided with ethylene and silane coupling agent with double bonds, stirring and reacting for 1 to 24 hours under a closed state at the temperature between 40 and 70 DEG C, then adding an oil-soluble cross linker and an oil-soluble initiator, stirring uniformly and then adding a dispersant and de-ionized water to prepare a suspension system, polymerizing for 2 to 6 hours in a nitrogen atmosphere at the temperature between 60 and 80 DEG C with rotating speed of 50-300 rpm, then raising the temperature to 95 DEG C and curing for 1 hour, then carrying out cooling and acid cleaning to obtain composite particles, adding hydrofluoric acid, dipping to remove the silicon dioxide inside the composite particles, then preparing the microcapsule with multi-cavities through neutralizing, washing and drying. The preparation method is easy to obtain materials, has simple technique, has good controllability on the morphostructure of the microcapsule, does not relate to organic solvents and is suitable for industrial production. Moreover, the prepared microcapsule has the advantages of high structure strength, multi-empty cavities and good controllability on the slow-release effect.

Description

technical field [0001] The invention relates to the field of microcapsules, in particular to a method for preparing multi-cavity microcapsules by chemical synthesis. Background technique [0002] Microcapsules generally refer to some micro-containers or packages made of natural or synthetic polymer materials with a polymer shell structure. The overall shape is generally spherical or spherical, and the interior can be filled or hollow. [0003] The preparation technology of microcapsules can be roughly classified into three categories: physical chemical method, physical mechanical method and chemical synthesis method. The physical chemical method is to use phase separation technology to make the core material and the wall material form a new phase precipitation method under certain conditions, the physical mechanical method is to use mechanical or other physical effects to form the capsule wall, and the chemical synthesis method is to use in solution. Or in colloids, monome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/18
Inventor 戚栋明邵建中袁艳杨雷
Owner ZHEJIANG SCI-TECH UNIV
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