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Preparation method for polymer nanometer latex

A kind of polymer and nanotechnology, which is applied in the field of polymer nanoemulsion preparation, can solve the problems of non-environmental protection and low preparation efficiency, and achieve the effects of low cost, uniform particle size, and easy large-scale production

Inactive Publication Date: 2014-07-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These improved soap-free emulsion methods still have the defects of not being environmentally friendly and having low preparation efficiency

Method used

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  • Preparation method for polymer nanometer latex

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 0.2g of sodium lauryl sulfate, 0.08g of azobisisobutyronitrile and 120mL of deionized water into a 250mL three-necked flask equipped with a stirring and condenser tube, stir for 30min with nitrogen, and raise the temperature to 70°C at 1.5 15 mL of methyl methacrylate monomer was slowly added over a period of hours. After the addition of the monomer, the reaction was continued for 4.5 hours to obtain a translucent blue-opalescent nanoemulsion. The average particle size of the nanoemulsion is 64nm, the polydispersity coefficient is 0.06, and the concentration is 110g / L. From the SEM images of the prepared nanoemulsions ( figure 1 ), it can be seen that the latex particles are basically spherical and uniform in size.

Embodiment 2

[0039] Add 0.2g of sodium lauryl sulfate, 0.08g of azobisisobutyronitrile and 120mL of deionized water into a 250mL three-necked flask equipped with a stirring and condenser tube, stir nitrogen for 30min, raise the temperature to 60°C, and 15 mL of methyl methacrylate monomer was slowly added over a period of hours. After the addition of the monomer, the reaction was continued for 5 hours to obtain a translucent blue-opalescent nanoemulsion. The average particle size of the nanoemulsion is 60nm, the polydispersity coefficient is 0.07, and the concentration is 112g / L.

Embodiment 3

[0041] Add 0.2g of sodium lauryl sulfate, 0.08g of azobisisoheptanonitrile and 120mL of deionized water into a 250mL three-necked flask equipped with a stirring and condenser tube, stir nitrogen for 30min, heat up to 40°C, and 15 mL of methyl methacrylate monomer was added over a period of hours. After the addition of the monomer was completed, the reaction was continued for 5.5 hours to obtain milky white nanoemulsion with bluish opalescence. The average particle size of the nanoemulsion is 70nm, the polydispersity coefficient is 0.04, and the concentration is 116g / L.

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Abstract

The invention relates to a preparation method for polymer nanometer latex. The preparation method includes the following steps: adding surface active agents, hydrophobic initiating agents and deionized water into a reaction container, stirring and carrying out nitrogen protection, rising temperature to 40 DEG C-80 DEG C, then adding monomers within 0.5-5 hours, adding cross-linking agents when adding the monomers, after adding, continuing reaction for 3-6 hours, and obtaining the polymer nanometer latex. The usage mount of the surface active agents is 0.3%-2.0% of the weight of the monomers. According to the preparation method, special high-performance devices are not required. A large amount of expensive surface active agents or co-surfactant is not required. Through simple one-step aqueous phase reaction, high-concentration polymer nanometer latex can be prepared. The preparation method has the advantages of being simple, efficient, environment-friendly, low in cost, and easy to produce in mass. The polymer nanometer latex prepared through the method is low in content of the surface active agents, has no need of post-processing, and can be directly applied.

Description

technical field [0001] The invention belongs to the field of preparation of nano-emulsion, in particular to a preparation method of polymer nano-emulsion. Background technique [0002] Compared with traditional polymerization methods, emulsion polymerization has the advantages of fast reaction rate, high monomer conversion rate, high molecular weight of polymerization products, safety and environmental protection, and is widely used in industrial production. Polymer latex microspheres prepared by emulsion polymerization can not only be used in the fields of synthetic rubber, synthetic resin, textile industry, paper industry, leather industry, coatings, inks, adhesives and other traditional materials, but also in biomedicine, nanomaterials, Emerging fields such as functional materials. Polymer nanoemulsions with a size less than 100nm have more prominent advantages in emerging fields due to their smaller size and larger specific surface area. [0003] The size of polymer la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F20/14C08F20/18C08F20/32C08F212/36C08F222/14C08F222/38C08F2/26C08F2/28C08F4/04C08F4/34
Inventor 张幼维何雅琴赵炯心
Owner DONGHUA UNIV
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