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Preparation method of In-situ polymerization microcapsule

An in-situ polymerization and microencapsulation technology, applied in the directions of microcapsule preparation, microsphere preparation, etc., can solve the problems of difficulty in realization and limit the scope of application of traditional in-situ polymerization and microencapsulation technology, so as to improve efficiency and process stability. Excellent, wide range of effects

Inactive Publication Date: 2010-04-14
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These all limit the scope of application of the traditional in-situ polymerization microencapsulation technology. For organic polymer monomers and core materials with poor compatibility, if the traditional in-situ polymerization microencapsulation technology is used to coat and form microcapsule products Difficult to achieve

Method used

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  • Preparation method of In-situ polymerization microcapsule
  • Preparation method of In-situ polymerization microcapsule
  • Preparation method of In-situ polymerization microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 : Preparation of polymethyl methacrylate coated paraffin microcapsules

[0025] The preparation process is as follows:

[0026] Take 10.0g of paraffin wax, 5.0g of n-butyl stearate and 5.0g of methyl methacrylate, add 3.0g of surfactant, heat in a water bath at 40°C and stir at 500r / min to make an oil phase; among them, The surfactant is a compound emulsifier composed of sorbitan oleate 80 (Span80) and polyoxyethylene sorbitan monooleate 80 (Tween80) in a mass ratio of 0.4:0.6.

[0027] Slowly add the above oil phase dropwise to 100.0g of the water phase under stirring at 40°C, and stir and emulsify for 30 minutes to obtain a stable emulsion;

[0028] Get ammonium persulfate 0.075g and sodium bisulfite 0.075g, add distilled water respectively and be made into each 5g initiator aqueous solution (totally 10g). Take out 1 / 3 of each initiator aqueous solution, slowly drop it into the above emulsion, stir at 500r / min and raise the temperature to 55°C to initiat...

Embodiment 2

[0031] Example 2 : Preparation and comparative analysis of a series of polymethyl methacrylate-coated paraffin wax microcapsules with different additions of n-butyl stearate

[0032] In embodiment 2, keep total core material (i.e. paraffin and n-butyl stearate, n-butyl stearate is also regarded as a part of core material) and organic macromolecular monomer (i.e. methyl methacrylate) The mass ratio is constant (i.e. the same as the corresponding mass ratio of 3: 1 in Example 1), the addition of n-butyl stearate is adjusted, and the preparation process of Example 1 is still adopted to prepare n-butyl stearate respectively A series of microcapsules added in different amounts, resulting in a linear change in the coverage of the core material.

[0033] Figure 3a , b is the thermal weight loss relationship curve and thermal weight loss percentage of methyl methacrylate-coated paraffin wax in-situ polymerized microcapsules corresponding to different n-butyl stearate additions. I...

Embodiment 3

[0039] Example 3 : Preparation of polystyrene-coated microcapsules of essential oils

[0040] The preparation process is as follows:

[0041] Example 3 uses a mixture of essential oil and petroleum ether as the core material, and diethyl phthalate as the solubilizing material. Firstly 3.0g essential oil is dissolved in 7.0g sherwood oil to make core material, then this core material, 5.0g diethyl phthalate, 5.0g styrene and 3.0g surfactant, at room temperature, 500r / Mix under stirring conditions for 1 min to make an oil phase; wherein, the surfactant is selected from sorbitan oleate 80 (Span80) and polyoxyethylene sorbitan monooleate 80 (Tween80) in a mass ratio of 0.4:0.6 Composed of compound emulsifiers.

[0042] Slowly add the above oil phase dropwise into 100.0 g of the water phase under stirring, and stir and emulsify for 30 minutes to obtain a stable emulsion;

[0043] Take 0.075 g of ammonium persulfate and 0.075 g of sodium bisulfite, and add distilled water resp...

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Abstract

The invention relates to an improved preparation method of a in-situ polymerization microcapsule, comprising the following steps: a. stirring and blending an organic polymer monomer, an organic hydrophobic material to be encapsulated and a solubilizing material that can enable the monomer and a core material to be blended stably to prepare a stable oil phase, wherein the organic hydrophobic material is inert relatively to the monomer, and the solubilizing material can enable the monomer and a core material to be blended stably; slowly dripping the oil phase into water under a certain temperature, stirring, and enabling the oil phase to be evenly dispersed in water phase to form emulsion; b. adding a free radical initiator water solution into the emulsion, enabling the free radicals to initiate the in-situ polymerization of the organic high polymer monomer by heating and stirring; and filtering, washing and drying to obtain the microcapsule. As the solubilizing material which has same or similar properties with the core material or has a certain synergistic effect is adopted, the organic monomer with poorer miscibility and the core material can be blended stably, therefore, the stability of the dispersing phase in the continuous phase is improved, the encapsulating efficiency is greatly improved at the same time of not reducing the target efficacy of the core material, the process stability is excellent, and the application range is wide.

Description

technical field [0001] The invention relates to the preparation technology of phase-change energy storage microcapsules, in particular to a preparation method for microencapsulating hydrophobic core materials by using organic polymer materials as wall materials and using an improved in-situ polymerization method. Background technique [0002] Microencapsulation technology refers to a technology in which tiny solid particles, liquid droplets or bubbles are coated with a coating film or shell material. The use of microencapsulation technology can achieve such as: improving the physical properties of the core material; improving the stability of the material, making the core material free from environmental influences, improving the reactivity and durability of the core material (prolonging the storage time of volatile substances) , pressure sensitivity, heat sensitivity and photosensitivity; reduce the adverse effects of toxic substances on the environment; enable the drug to ...

Claims

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Application Information

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IPC IPC(8): B01J13/18C08F20/14C08F20/18C08F12/08C08F2/44C08K5/01C08K5/00
Inventor 褚晓东唐国翌姚有为樊鹏飞
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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