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Preparation method of core-shell polymer microspheres encapsulated with functional core material

A polymer and core material technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve problems such as the mismatch between the polymerization speed and the phase separation speed, the reduction of the barrier effect of the capsule core, and the defects of the polymer shell, so as to achieve the encapsulation performance. Excellent, defect structure reduction, small wall thickness deviation effect

Active Publication Date: 2022-07-19
上海烯耀材料科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In industrial production, the uneven distribution of temperature makes the polymerization rate and the phase separation rate mismatch, resulting in defects and weak structures in the polymer shell, which reduce the barrier effect on the capsule core

Method used

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  • Preparation method of core-shell polymer microspheres encapsulated with functional core material

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preparation example Construction

[0019] In the preparation method of the core-shell polymer microspheres encapsulated with functional core materials of the present invention, the following steps are included:

[0020] (1) oil phase preparation step: the step of preparing the oil phase by mixing the polymerizable monomer, functional core material, crosslinking agent, and initiator;

[0021] (2) water phase preparation step: mixing stabilizer, co-stabilizer, inorganic salt, polymerization inhibitor, Janus particles and deionized water to prepare water phase;

[0022] (3) emulsification step: the step of mixing the oil phase obtained in the step (1) and the water phase obtained in the step (2) and emulsifying to obtain a suspoemulsion;

[0023] (4) Polymerization reaction step: the step of subjecting the suspoemulsion obtained in the step (3) to a polymerization reaction at a temperature of 20 to 100° C. for 10 to 30 hours.

[0024] In the preparation method of the core-shell polymer microspheres encapsulated w...

Embodiment 1

[0108] As polymerizable monomers, acrylonitrile, methyl methacrylate, methacrylic acid, and N,N-dimethylacrylamide are added to a beaker in a ratio of 60:30:5:5 in terms of mass and mixed to form a Single phase spare. The aforementioned monomer phase, hexadecane, azobisisobutyronitrile, and triethylene glycol dimethacrylate were mixed in a ratio of 66:30:2:2 by mass, and configured into an oil phase for later use.

[0109] Add deionized water, sodium chloride, silica sol, Janus particle 1, cetyltrimethylammonium bromide, potassium dichromate by mass in a ratio of 67.9:10:20:0.1:1:1 Mix in the beaker to configure the aqueous phase for later use.

[0110] In the aforementioned Janus particle 1, the A side is polyacrylonitrile, the B side is polyacrylic acid, and the W side is polyacrylonitrile. A :W B = 1.5:1, the particle size is 250 nm, and the grafting rate on both sides is 5% (the grafting rate is the ratio of the mass of the added monomer to the mass of PEOS).

[0111] ...

Embodiment 2

[0116] As polymerizable monomers, methyl methacrylate, methacrylic acid, and N,N-dimethylacrylamide were added to a beaker in a ratio of 70:25:5 by mass, and mixed to prepare a monomer phase for later use. The aforementioned monomer phase, hexadecane, azobisisobutyronitrile, and triethylene glycol dimethacrylate were mixed in a ratio of 66:30:2:2 by mass, and configured into an oil phase for later use.

[0117] Add deionized water, sodium chloride, silica sol, Janus particle 1, cetyltrimethylammonium bromide, potassium dichromate by mass in a ratio of 67.9:10:20:0.1:1:1 Mix in the beaker to configure the aqueous phase for later use.

[0118] The aforementioned oil phase and water phase were mixed in a mass ratio of 25:75, and emulsified under an emulsifying machine to obtain suspoemulsion 2.

[0119] The suspoemulsion 2 was subjected to gradient temperature polymerization. That is, firstly, the reaction was carried out at a temperature of 50°C for 10 hours, then the temperat...

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Abstract

The invention relates to a method for preparing core-shell polymer microspheres encapsulated with functional core materials, which comprises: (1) an oil phase preparation step: mixing a polymerizable monomer, a functional core material, a crosslinking agent and an initiator (2) water phase preparation step: mixing stabilizer, co-stabilizer, inorganic salt, polymerization inhibitor, Janus particles, and deionized water to prepare water phase; (3) emulsification Step: the oil phase obtained in the step (1) and the water phase obtained in the step (2) are mixed and emulsified to obtain a suspoemulsion step; (4) polymerization step: the step (3) is mixed ) The obtained suspension emulsion is subjected to the step of carrying out a polymerization reaction at a temperature of 20 to 100° C. for 10 to 30 hours. By adopting the preparation method of the present invention, the multi-core structure of the microspheres due to the lack of phase separation of the polymer to the interface can be effectively avoided, the wall thickness deviation is reduced, the defect structure is reduced, and the functional core material encapsulated with excellent encapsulation performance can be obtained. Core-shell polymer microspheres.

Description

technical field [0001] The present disclosure belongs to the technical field of preparation of polymer microspheres, and in particular relates to a preparation method of core-shell type polymer microspheres encapsulated with functional core materials. Background technique [0002] Core-shell polymer microspheres are a kind of microsphere materials with core-shell structure and size ranging from tens of nanometers to hundreds of micrometers. It is isolated from the external environment. For microspheres encapsulating functional core materials, the barrier properties of the polymer shell are of great significance to the microcapsules, and excellent barrier properties mean good protection for the capsule core materials. [0003] Suspension polymerization is a common polymerization method for preparing core-shell microspheres. Monomers, initiators, functional substances, etc. are mixed in droplets and suspended in water for free radical polymerization. As the polymer formed by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F220/48C08F220/14C08F220/06C08F220/54C08F222/20C08F2/18C08F2/44C08K5/01B01J13/14
CPCC08F285/00C08F2/18C08F2/44C08K5/01B01J13/14C08F220/48C08F220/14C08F220/06C08F220/54C08F222/102
Inventor 王海涛胡斌涛
Owner 上海烯耀材料科技有限公司
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