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Core-shell structural organic/ inorganic composite hollow porous microsphere and preparation method thereof

An inorganic composite, core-shell structure technology, applied in the preparation of microspheres, microcapsule preparations, etc., can solve the problems affecting the application of PS hollow microspheres, the destruction of the three-dimensional structure, the inability to apply melt processing, etc., to improve the extinction effect and ultraviolet shielding. effect, improved utilization, good matting effect

Active Publication Date: 2018-07-06
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other methods of preparing polymer particles such as precipitation method, reverse suspension cross-linking method, spray drying method, etc., the preparation of microspheres by electrostatic spraying has simple process, strong controllability, environmental protection and no need to use a large amount of emulsifier. The electrostatic spray method is easy to prepare monodisperse particles and the final particles can have a variety of shapes, such as hollow and porous, such as existing literature (Zhan Naiqian. Preparation of polystyrene functional materials by electrospinning[D]. Jilin University, 2010.) reported that polystyrene solution can prepare porous hollow microspheres by electrostatic spray molding, and the prepared polystyrene (PS) hollow microspheres are chemically stable at room temperature and have good processability. However, since the glass transition temperature of polystyrene (PS) is only 100°C, the three-dimensional structure will be destroyed under high temperature conditions, so it cannot be applied to melt processing.
This greatly affects the application of PS hollow microspheres

Method used

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  • Core-shell structural organic/ inorganic composite hollow porous microsphere and preparation method thereof

Examples

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Embodiment 1

[0055] A method for preparing a core-shell structure organic / inorganic composite hollow porous microsphere, the steps are:

[0056] (1) styrene, Bis-GMA, DMPOH and phenyl salicylic acid are dissolved in DMF to obtain an electrospray solution, wherein in the electrospray solution, Bis-GMA accounts for 5wt% of styrene and Bis-GMA total amount, DMPOH accounts for 1.0wt% of the total amount of styrene and Bis-GMA, phenyl salicylic acid accounts for 10wt% of the total amount of styrene and Bis-GMA, and DMF accounts for 80wt% of the total amount of styrene and Bis-GMA;

[0057] (2) Preparation of modified titanium dioxide:

[0058] a) Disperse titanium dioxide in absolute ethanol and add n-butyl titanate dropwise to obtain a mixed dispersion after ultrasonic stirring, wherein the mass ratio of titanium dioxide, absolute ethanol and n-butyl titanate in the mixed dispersion is 4:150: 1;

[0059] b) Add ethanol-water mixture dropwise to the mixed dispersion, react at 70°C for 4 hours...

Embodiment 2

[0066] A method for preparing a core-shell structure organic / inorganic composite hollow porous microsphere, the steps are:

[0067] (1) Styrene, EBPADMA, CQ and p-tert-butyl salicylate are dissolved in chloroform to obtain an electrospray solution, and EBPADMA accounts for 15wt% of styrene and EBPADMA total amount in the electrospray solution, and chloroform accounts for 56wt% of the total amount of styrene and EBPADMA, CQ accounts for 0.6wt% of the total amount of styrene EBPADMA, and p-tert-butyl salicylate accounts for 15wt% of the total amount of styrene EBPADMA;

[0068] (2) Preparation of modified titanium dioxide:

[0069] a) Disperse titanium dioxide in absolute ethanol and add n-butyl titanate dropwise to obtain a mixed dispersion after ultrasonic stirring, wherein the mass ratio of titanium dioxide, absolute ethanol and n-butyl titanate in the mixed dispersion is 5:200: 1;

[0070] b) Add the ethanol-water mixture dropwise to the mixed dispersion, react at 60°C for...

Embodiment 3

[0077] A method for preparing a core-shell structure organic / inorganic composite hollow porous microsphere, the steps are:

[0078] (1) Dissolve the mixture of styrene, UDMA, DMPOH and CQ (mass ratio is 1:1) and 2-hydroxy-4-methoxybenzophenone in dichloromethane to obtain electrospray solution, electrospray solution Among them, UDMA accounts for 5wt% of the total amount of styrene and UDMA, dichloromethane accounts for 70wt% of the total amount of styrene and UDMA, the mixture of DMPOH and CQ accounts for 1.8wt% of the total amount of styrene and UDMA, 2-hydroxyl-4- Methoxybenzophenone accounts for 20wt% of the total amount of styrene and UDMA;

[0079] (2) Preparation of modified titanium dioxide:

[0080] a) Disperse titanium dioxide in absolute ethanol and add n-butyl titanate dropwise to obtain a mixed dispersion after ultrasonic stirring, wherein the mass ratio of titanium dioxide, absolute ethanol and n-butyl titanate in the mixed dispersion is 6:250: 1;

[0081] b) A...

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Abstract

The invention relates to a core-shell structural organic / inorganic composite hollow porous microsphere and a preparation method thereof. The method comprises the following steps: dissolving styrene,a bifunctionality dimethacrylate organic monomer, a photoinitiator and an organic UV absorbent into a solvent to obtain an electronic injection solution; adding modified titanium dioxide containing two bonds in the surface to the electronic injection solution to disperse uniformly; and performing electrostatic spraying in a visible light condition to obtain the hollow porous microsphere comprisinga crosslinking sphere, titanium dioxide particles and the organic UV absorbent; the crosslinking spheres are hollowed out, the surfaces are porous, and the crosslinking spheres are provided with crosslinking structures; the titanium dioxide particles are wrapped with the crosslinking spheres are in a covalent bond connection manner; the organic UV absorbent is doped in the crosslinking structuresand / or attached to the inner walls of the crosslinking spheres. The method is simple and convenient in processes; the prepared hollow porous microspheres have the advantages of being good in extinction effect, high in UV resistance, high in smelting temperature, and high in thermal decomposition temperature.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials, and in particular relates to a core-shell structure organic / inorganic composite hollow porous microsphere and a preparation method thereof. Background technique [0002] In recent years, people have increasingly discovered the dangers of ultraviolet radiation. Excessive exposure to ultraviolet rays can lead to skin cancer. Ultraviolet rays can not only degrade the polymer chains in plastics, synthetic resins and rubbers, leading to the aging of materials, but also make the weather resistance of paints and coatings worse, causing paints and coatings to be easily powdered, cracked, or even peeled off. In addition, the paper’s Yellowing, brittleness, etc. are all related to ultraviolet rays. Therefore, the research on UV shielding materials has attracted more and more attention. [0003] Titanium dioxide has outstanding coloring power, hiding power and extinction ability. It is a white pigmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/14C08F292/00C08F222/14C08F212/08C08F2/48C08F2/44C08K5/13
CPCB01J13/14C08F2/44C08F2/48C08F292/00C08K5/13C08F222/102
Inventor 孙宾朱美芳詹伟东纪晓寰李剑峰李晓明
Owner DONGHUA UNIV
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