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Preparation method of large-particle-size hollow polymer microspheres

A polymer, large particle size technology, applied in the field of hollow polymer microspheres, can solve problems such as viscosity increase, achieve the effects of less environmental pollution, easy to obtain, and avoid cumbersome procedures

Active Publication Date: 2015-09-02
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hollow polymer microparticles obtained by this method have a two-layer structure, and the alkali-soluble polymer inside is easy to diffuse into the water phase through the surrounding layer, and will increase viscosity during long-term storage.

Method used

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  • Preparation method of large-particle-size hollow polymer microspheres
  • Preparation method of large-particle-size hollow polymer microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) Weigh 75g MgCl2 6H2O and dissolve it in 1000g deionized water to obtain MgCl2 solution, and then weigh 42g NaOH solid and dissolve it in 450g deionized water to obtain NaOH solution. Slowly add NaOH solution to MgCl2 under mechanical stirring at a speed of 650rpm In the solution, stir for 50min to obtain Mg(OH)2 colloid, which is used as a dispersant for subsequent use.

[0049] (2) Weigh 0.8g DAP (p-phenylenediamine) and dissolve it in 100g deionized water to form a water phase; successively weigh 32g of BPO (benzoyl peroxide), 250g of St (styrene), and MA (methyl acrylate) 150g, TDM (dodecyl mercaptan) 4.00g, stirring and dissolving to form a dispersed phase; under mechanical stirring at a speed of 650rpm, add the water phase and the dispersed phase to the Mg(OH)2 dispersant in turn, and maintain the pre-emulsification for 30min Add the obtained pre-emulsion into a high-speed shear disperser, emulsify and disperse for 30 min at a shear speed of 12000 rpm, rinse wi...

Embodiment 2

[0051] (1) Weigh 75g MgCl2 6H2O and dissolve it in 1000g deionized water to obtain MgCl2 solution, and then weigh 42g NaOH solid and dissolve it in 450g deionized water to obtain NaOH solution. Slowly add NaOH solution to MgCl2 under mechanical stirring at a speed of 650rpm In the solution, Mg(OH)2colloid is prepared, which is used as a dispersant for subsequent use.

[0052] (2) Weigh 1.2g of DAP (p-phenylenediamine) and dissolve it in 100g of deionized water to prepare the water phase; successively weigh 32g of BPO (benzoyl peroxide), 220g of St (styrene), and 220g of MA (methyl acrylate). ) 180g, TDM (dodecyl mercaptan) 8.00g, stirring and dissolving to form a dispersed phase; under mechanical stirring at a speed of 650rpm, add the water phase and the oil phase to the Mg(OH)2 dispersant in turn to maintain pre-emulsification 30min; the obtained pre-emulsion was added to a high-speed shear disperser, and at a shear speed of 12000rpm, emulsified and dispersed for 25min, after...

Embodiment 3

[0054] (1) Weigh 97.60g MgCl2 6H2O and dissolve it in 1000g deionized water to obtain MgCl2 solution, and then weigh 67.21g NaOH solid and dissolve it in 450g deionized water to obtain NaOH solution. Add MgCl2 solution to prepare Mg(OH)2 colloid, which is used as a dispersant for later use.

[0055] (2) Weigh 0.04g DAP (p-phenylenediamine) and dissolve it in 100g deionized water to form an aqueous phase; successively weigh 32g of BPO (benzoyl peroxide), 392g of St (styrene), and MA (methyl acrylate) 8g, TDM (dodecyl mercaptan) 2.00g, stirring and dissolving to form a dispersed phase; under mechanical stirring at a speed of 650rpm, add the water phase and the dispersed phase to the Mg(OH)2 dispersant in turn, and maintain the pre-emulsification for 30min The obtained pre-emulsion is joined in the high-speed shear disperser, and under the shear speed of 10000rpm, the emulsification is dispersed for 30min, and after the emulsification finishes, the emulsifier is rinsed with 100g ...

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Abstract

The invention relates to a preparation method of large-particle-size hollow polymer microspheres. The preparation method comprises the following steps: preparing a metal hydroxide colloidal dispersant by the prior art, sequentially adding an oil phase (which is composed of a vinyl aromatic monomer, methyl acrylate (MA) and / or ethyl acrylate (EA) and contains an oil-soluble peroxide initiator) and a water phase containing a small amount of polymerization inhibitor into the metal hydroxide colloidal dispersant, carrying out high-speed shear emulsifying dispersion, transferring the emulsified dispersion solution into a reactor, and carrying out microsuspension polymerization to finally obtain the large-particle-size hollow polymer microspheres. The technique is one-step synthesis, is simple to operate and mild in reaction conditions, does not use any organic solvent as a pore forming agent, and has the advantages of environment friendliness and low pollution. The obtained large-particle-size hollow polymer microspheres are easy to separate.

Description

technical field [0001] The invention relates to a hollow polymer microsphere. Specifically, the invention provides a technical process for preparing large-diameter hollow polymer microspheres in one step. Background technique [0002] After the hollow microparticle emulsion is dried, the water inside the particle disappears to form single or multiple pores. Compared with solid microsphere materials, hollow microspheres have low density, high specific surface area and can accommodate guest molecules due to their internal cavity structure. And other characteristics, so it has a wide range of applications in many fields such as coatings, papermaking, electronics, catalysis, separation, biomedicine, etc. Under the conditions of heat and pressure, microparticles are easily deformed to obtain a high smooth surface to achieve high white paper gloss; organic hollow microparticles have an internal cavity structure, a highly cross-linked shell, and are easy to uniformly disperse in o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F212/12C08F212/32C08F220/14C08F220/18C08F2/18C08F4/34
Inventor 刘祥杨正凯黄维
Owner NANJING UNIV OF TECH
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