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Method for preparing microcapsules through polymer precoating

A technology of polymers and microcapsules, applied in the field of polymer pre-coating to prepare microcapsules, can solve the problems of limited use range, inability to connect core material and wall material reasonably, inability to achieve effective encapsulation and stable storage, etc. Excellent and versatile effect

Active Publication Date: 2016-08-17
GUANGZHOU MILLIM VEGETABLE TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the methods adopted in the above-mentioned patents can well disperse the microcapsule particles and prevent particle agglomeration, they can only effectively disperse a certain kind or a certain type of core material, while coating other different properties When the core material is used, the core material and the wall material cannot be reasonably connected, and the purpose of effective encapsulation and stable storage cannot be achieved, and the scope of use is very limited
In addition, general protective colloids cannot adjust the wall strength of microcapsules according to demand
So far, there has not been reported a method that can effectively disperse microcapsule particles, reasonably bridge various properties of the microcapsule core material and wall material to be coated, and control the thickness of the polymer precoat layer to achieve microcapsule wall thickness. A general method for tuning the mechanical properties of materials

Method used

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  • Method for preparing microcapsules through polymer precoating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Add 1.0g polymethyl methacrylate and 20.0g dichloromethane into a beaker, stir and mix evenly to obtain a 5% polymethyl methacrylate dichloromethane solution, add 1.0g rose essential oil, stir and mix Uniformly, a mixed solution is obtained;

[0048] 2) Add 100.0g of distilled water and 0.5g of polyvinyl alcohol (1788) into a reactor equipped with a heating device and a stirrer, heat and stir until the polyvinyl alcohol is completely dissolved, then lower the system temperature to room temperature. Then add the mixed solution in step 1), maintain the stirring speed at 500rpm, and raise the temperature at a rate of 5.0°C / min to slowly volatilize the dichloromethane. When the temperature reaches 50.0°C, stop the heating and keep it warm for 30min to obtain polymethyl methacrylate. Microcapsules coated with rose essential oil;

[0049] 3) Lower the temperature of the reaction system to room temperature, add 0.5 g of gelatin, stir at a speed of 300 rpm, and mature in a ...

Embodiment 2

[0051]1) Add 5.0g polyacrylamide and 50.0g dichloromethane into a beaker, stir and mix evenly to obtain a polyacrylamide dichloromethane solution with a mass percentage of 10%, add 10.0g clove oil, stir and mix evenly to obtain a mixed solution;

[0052] 2) Add 300.0g of distilled water and 4.5g of sodium dodecylsulfonate to the reactor with heating device and stirrer, heat and stir until the sodium dodecylsulfonate is completely dissolved, then lower the temperature of the system to room temperature , then add the mixed solution in step 1), maintain the mixer speed at 1000rpm, and raise the temperature at a rate of 3.0°C / min to slowly volatilize the dichloromethane. When the temperature reaches 50.0°C, stop the temperature rise and keep it warm for 20min to obtain polyacrylamide pre-coating Microcapsules of clove oil;

[0053] 3) Lower the temperature of the reaction system to room temperature, add 10 g of polystyrene, stir at 800 rpm, and mature in a water bath at 60°C for 5...

Embodiment 3

[0055] 1) Add 8.0g polybutylacrylate-acrylic acid and 40.0g chloroform into a beaker, stir and mix evenly to obtain a 20% mass percent polybutylacrylate-acrylic acid chloroform solution, add 24.0g patchouli oil, and stir Mix evenly to obtain a mixed solution;

[0056] 2) Add 500.0g of distilled water and 15.0g of polyvinylpyrrolidone into the reactor with heating device and stirrer, heat and stir until the polyvinylpyrrolidone is completely dissolved, then lower the system temperature to room temperature, and then add step 1) For the mixed solution, maintain the mixer speed at 3000rpm, raise the temperature at a rate of 2.0°C / min to slowly volatilize chloroform, and when the temperature reaches 72.0°C, stop the heating and keep it warm for 40min to obtain polybutylacrylate-acrylic acid pre-coated patchouli oil microcapsules;

[0057] 3) Lower the temperature of the reaction system to room temperature, add 30g of urea-formaldehyde resin, stir at a speed of 1000rpm, and mature ...

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Abstract

The invention discloses a method for preparing microcapsules through polymer precoating. The method includes the following steps that firstly, polymer is added into an organic solvent, stirred and mixed evenly to obtain a polymer solution, and then a core material is added, stirred and evenly mixed to obtain a mixed solution; secondly, colloid protector is added into water, stirred and evenly mixed, the mixed solution in the first step is added during stirring, the temperature is raised so that the organic solvent can completely volatilize, and microcapsules of the polymer precoated core material are obtained; thirdly, a wall material is added, stirred and fully cured, and the microcapsules are obtained. The method is good in universality, simple, quick, economical and capable of being widely used in the field of novel microcapsule preparation. The microcapsules are adjustable in size and structure, surface functional modification can be conducted, performance is excellent, and the microcapsules are economical and practical.

Description

technical field [0001] The invention relates to a method for preparing microcapsules by polymer pre-coating. Background technique [0002] Microcapsule technology has been widely used in daily chemicals, food industry, biomedicine, polymer material additives and other fields. According to different needs, people use this technology to protect the coated substance from the influence of the external environment, improve the stability of the substance, shield the odor, and controllable release. The target substance is effectively processed by natural, synthetic or semi-synthetic polymer materials. clad. Therefore, microencapsulation technology has developed rapidly in recent years and has become an effective commercialization method in many industrial fields. [0003] The preparation methods of microcapsule products include chemical methods, physicochemical methods and physical methods. During the preparation process, how to make the wall material react effectively on the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02
CPCB01J13/02
Inventor 王蕾谢佳李荣李大可
Owner GUANGZHOU MILLIM VEGETABLE TECH DEV CO LTD
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