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Preparation method of strawberry type organic-inorganic composite particles

A composite particle, strawberry-type technology, applied in the field of synthesis of strawberry-type organic-inorganic composite particles, can solve the problems of increased difficulty in purification, preparation of organic-inorganic composite nanoparticles, increased production costs, etc., to achieve separation and versatility , Ease of large-scale production

Inactive Publication Date: 2015-05-13
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method not only fails to combine polymers to prepare organic-inorganic composite nanoparticles, but also the size of ZnO greatly exceeds the nanometer range.
In addition, the introduction of emulsifier not only increases the production cost, but also increases the difficulty of subsequent purification

Method used

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  • Preparation method of strawberry type organic-inorganic composite particles
  • Preparation method of strawberry type organic-inorganic composite particles
  • Preparation method of strawberry type organic-inorganic composite particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0032] Implementation Case 1 Preparation of Strawberry Type PVC / ZnO Composite Particles

[0033]

[0034]

[0035]

[0036] In a 2L autoclave, add 6.0g hydrophilic monomer acetoacetoxyethyl methacrylate (AAEM), 600.0g deionized water, 0.72g potassium persulfate, seal the autoclave, repeatedly vacuumize and fill nitrogen three times, Ensure that the atmosphere before the reaction is nitrogen, the pressure is normal pressure, start stirring, set the stirring speed to 300r / min, add 60.0g of template monomer vinyl chloride (VC) after stirring for 15 minutes, and quickly heat up to the reaction temperature of 55°C after stirring for 15 minutes , stop the reaction when the pressure drops to 0.25MPa, depressurize (vacuum about 0.0995MPa) to remove the unreacted vinyl chloride monomer, and then obtain the PVC stencil emulsion. Immediately, the emulsion sample was taken directly, and the morphology of the PVC template particles was observed with a scanning electron microscope....

Embodiment example 2-5

[0044] The addition amount of the hydrophilic monomer AAEM of the implementation case 2-5 is 0g, 3g, 9g, 12g respectively, and the rest of the implementation process is the same as the implementation case 1, and the SEM photos of the composite particle forms prepared by the implementation case 2-5 are shown in Appendix 4 -7.

[0045] Depend on Figure 4-6 SEM photos can be observed, ZnO nanoparticles deposited on the PVC template to form a strawberry. ZnO crystals are spherical with a diameter of 20-50nm. With the increase of AAEM content, the number of nano-ZnO particles on the surface of the stencil increases. Depend on Figure 7 It can be seen that when the content of AAEM reaches 20wt% of the template monomer, the core-shell morphology of ZnO crystals incompletely covering the template particles is formed.

[0046] The change of ZnO morphology and content with the change of AAEM content is explained as follows: the zinc oxide precursor interacts with the stencil latex ...

Embodiment example 6-7

[0049] In Example 6-7, the amount of sodium hydroxide added is 0.04g and 0.08g respectively, that is, the corresponding concentration is 0.5mol L -1 , 1.0mol·L -1 . The added volume remains the same as 2mL, and the rest of the implementation process is the same as that of Example 1. The SEM photo of the composite particle form prepared by implementation case 6-7 is attached Figure 8-9 .

[0050] Analyzing the above: Implementation Cases 6-7, in the reaction medium of isopropanol, NaOH plays an important role in the nucleation and growth process of ZnO. Figure 8-9 SEM photographs of the morphology of composite particles prepared for Example 6-7. It can be seen from the figure that zinc oxide nanoparticles are evenly attached to the surface of PVC latex particles at any concentration, presenting a strawberry-like specific shape. Not only that, as the concentration of NaOH increases from 0.5mol·L -1 Increased to 1.0mol·L -1 , more and more zinc oxide particles are attach...

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Abstract

The invention discloses a preparation method of strawberry type organic-inorganic composite particles. The preparation comprises the following steps: (a) preparation of template polymer particles: adding hydrophilic monomers, deionized water, an initiating agent and template monomers in a high-pressure kettle, performing a reaction under 40-70DEG C, and stopping the reaction when the pressure drops to 0.1-0.4MPa so as to obtain a template polymer emulsion; (b) preparation of the strawberry type organic-inorganic composite particles: pouring zinc acetate and a solvent in a reactor, after performing dispersion under 20 DEG C for 10 min, raising the temperature to 55DEG C, holding the temperature for 1h; adding the template polymer emulsion in the heated reactor, adding a water solution of a second reactant, performing rotary evaporation on composite particles obtained after the reaction, performing centrifugal water washing, and performing low-temperature drying till the weight of the dried materials is constant so as to obtain the strawberry type organic-inorganic composite particles of which the morphologies are controllable. According to the preparation method disclosed by the invention, the micromorphologies and sizes of ZnO particles can be effectively controlled so as to prepare the strawberry type organic-inorganic composite particles of which the morphologies are controllable.

Description

Technical field: [0001] The invention belongs to the synthesis of strawberry-type organic-inorganic composite particles, specifically by changing the hydrophilicity of polymer templates, adopting a solution phase method, and utilizing the complexation of surface organic functional groups and metal cations to control the growth of inorganic particles on the surface , A preparation method for obtaining strawberry-shaped organic-inorganic composite particles. technical background: [0002] Polymer / inorganic composite materials refer to multiphase materials constructed by combining polymers and inorganic substances, among which micron or nanoscale composite particles are one of the most active frontier directions in the field of international composite materials today. The polymer / inorganic strawberry particle is a composite particle with a strawberry-like structure (strawberry / raspberry structure) formed by coating the surface of the polymer particle with inorganic particles. ...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08L33/08C08L27/18C08L27/08C08L33/14C08L39/08C08K3/22C08F214/06C08F220/28C08F220/18C08F214/26C08F214/22C08F220/32C08F226/06
CPCC08F214/06C08F214/225C08F214/265C08F220/18C08F220/1804C08F220/32C08F220/325C08F226/06C08K3/22C08K2003/2296C08K2201/011C08L27/06C08L39/08C08L33/14C08L33/08C08L27/16C08L27/18C08F220/283
Inventor 潘明旺任婷婷王杰袁金凤张广林
Owner HEBEI UNIV OF TECH
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