Method for synthesizing polymer particles with multilayer shell structure by semicontinuous emulsion polymerization

A technology of structural polymer and emulsion polymerization, applied in the field of polymer chemical industry

Inactive Publication Date: 2014-03-19
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of traditional emulsion shell structure products mostly adopts the seed polymerization method, which is difficult to prepare polymer nanoparticles with a particle size of less than 80nm when preparing shell structure products. At the same time, initiators and various other additives need to be added, and the polymerization is mostly based on grafting, and the resulting emulsion has a large particle size.
Moreover, the content of emulsifier in general emulsion polymerization is more than 10%, and the mass concentration of monomer is generally lower than 10%, which affects the practical application of emulsion polymer nanoparticles in industrialization

Method used

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  • Method for synthesizing polymer particles with multilayer shell structure by semicontinuous emulsion polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1: Preparation of polymer particle core with shell structure

[0029] Add 2.0gSDS to 0.1gNaHCO 3 , 80g of deionized water in a solution. Repeatedly pass nitrogen to remove oxygen in the system, stir the solution to 65°C and add 0.3g of APS initiator, raise the temperature to 80°C at a constant temperature, slowly and continuously drop 10g of styrene (St) into the system at a rate of 0.16g / min Add dropwise at a speed of 1 h, maintain a nitrogen atmosphere, and stir at a low speed. After the dropwise addition, continue to react at 80° C. for 2 h to complete the monomer reaction.

[0030] Two: Preparation of the middle layer of polymer particles with shell structure

[0031] Slowly and continuously drop 5g of methyl methacrylate (MMA) monomer into the system, maintain the conditions of 80°C and nitrogen atmosphere, stir at a low speed, add dropwise at a speed of 0.08g / min for 1h, continue to react at 80°C after the dropwise addition is completed 1h, to complete the mon...

Embodiment 2

[0037] 1: Preparation of polymer particle core with shell structure

[0038] Add 2.0gSDS to 0.1gNaHCO 3 , 80g of deionized water in a solution. Repeatedly pass nitrogen to remove oxygen in the system, stir the solution to 65°C and add 0.3g KPS initiator, raise the temperature to 80°C at a constant temperature, slowly and continuously drop 15g of styrene (St) into the system at a rate of 0.25g / min Add dropwise at a speed of 1 h, maintain a nitrogen atmosphere, and stir at a low speed. After the dropwise addition, the reaction was continued at 80°C for 2 h to complete the monomer reaction.

[0039] Two: Preparation of the middle layer of polymer particles with shell structure

[0040] Slowly and continuously drop 5g of methyl methacrylate (MMA) monomer into the system, maintain the conditions of 80°C and nitrogen atmosphere, stir at a low speed, add dropwise at a speed of 0.08g / min for 1h, continue to react at 80°C after the dropwise addition is completed 1h, to complete the...

Embodiment 3

[0048] 1: Preparation of polymer particle core with shell structure

[0049] Add 2.0gSDS / OP-10 compound emulsifier (SDS / OP-10=2:1, mass ratio, the same below) to 0.1gNaHCO 3 , 80g of deionized water in a solution. Repeatedly pass nitrogen to remove oxygen in the system, stir the initiator solution to 65°C and add 0.3g of KPS initiator, raise the temperature to 80°C at a constant temperature, slowly and continuously drop 10g of styrene (St) into the system at a rate of 0.16g / Add dropwise at a speed of min for 1 h, maintain a nitrogen atmosphere, and stir at a low speed. After the dropwise addition, continue to react at 80° C. for 2 h to complete the monomer reaction.

[0050] Two: Preparation of the middle layer of polymer particles with shell structure

[0051] Slowly and continuously drop 10g of methyl methacrylate (MMA) monomer into the system, maintain the conditions of 80°C and nitrogen atmosphere, stir at a low speed, add dropwise at a speed of 0.16g / min for 1h, and c...

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Abstract

The invention provides a method for synthesizing polymer particles with a multilayer shell structure by semicontinuous emulsion polymerization, and belongs to the field of polymer chemical industry. Through semicontinuous polymerization technology, emulsion polymer nanoparticles with a multilayer shell structure can be synthesized, and the product has the advantages of small particle size, narrow particle size distribution, relatively high solid content, low emulsifier using amount, and the like, and has good application prospects in industrial production.

Description

technical field [0001] The invention belongs to the field of polymer chemical industry, and relates to a method for synthesizing polymer particles with a multi-layer shell structure by semi-continuous emulsion polymerization. Background technique [0002] Core-shell emulsion polymerization, the so-called core-shell refers to the structure in which polymer A is the core and latex particles coated with polymer B are the shell. Two or more monomer molecules with different properties are polymerized in stages under certain conditions, so that the inside and outside of the particle are enriched with different components, and a series of latex particles of different shapes are obtained through different combinations of core and shell. Various functions can be endowed to the core shell. In the traditional sense, the polymerization process has a great influence on the latex particles, the most important of which is the feeding method. Generally, there are three ways to add monomer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F218/08C08F220/14C08F220/32C08F220/28C08F2/26C08F2/30
Inventor 张震乾何剑虹
Owner CHANGZHOU UNIV
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