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Environment-friendly preparation method of polyamide microspheres

A polyamide and environment-friendly technology, applied in the field of environment-friendly preparation of polyamide microspheres, can solve problems such as unfavorable environmental protection, chemical danger, increase of preparation cost, etc., and achieves avoiding cost increase, good particle size consistency, and avoiding process Complicated effect

Active Publication Date: 2014-09-17
江苏瑞美福新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of organic solvents in the production process is a chemical hazard and harmful factor, which is not conducive to environmental protection; the separation liquid generated after the production is completed becomes a waste liquid and must be treated harmlessly, which not only leads to the complexity of the polyamide microsphere preparation process , which increases the cost of preparation

Method used

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  • Environment-friendly preparation method of polyamide microspheres
  • Environment-friendly preparation method of polyamide microspheres
  • Environment-friendly preparation method of polyamide microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Weigh 95g of butyrolactam, heat it to a molten state of 30°C, add 5g of polystyrene into it, stir and dissolve; after the polystyrene is completely dissolved, turn on the vacuum pump, and carry out vacuum distillation on the above melt mixture to remove trace amounts of water, then add 0.05g of sodium and 0.05g of toluene-2,4-diisocyanate, mix quickly and evenly, pour it into a preheated mold at a temperature of 120°C, and carry out anionic ring-opening polymerization of butyrolactam, constant temperature reaction 1 Minutes later, the mold was cooled and demolded to obtain the polyamide / polystyrene alloy; the polyamide / polystyrene alloy was crushed, then added to 200g of molten butyrolactam at 30°C, fully dissolved and filtered, and the obtained insoluble matter was Polyamide microspheres; the remaining filtrate is the butyrolactam melt mixture containing 5g polystyrene, and the polystyrene of 5.27g is added in this melt mixture, and obtaining polystyrene content is the ...

Embodiment 2

[0023] Weigh 50g of caprolactam, heat it to 180°C to melt, then add 50g of polyacrylonitrile into it, and stir to dissolve; after the polyacrylonitrile is completely dissolved, turn on the vacuum pump, and carry out vacuum distillation on the above melt mixture to remove a small amount of water, and then Add 1g of sodium hydride and 1g of benzoyl chloride, mix quickly and evenly, pour into a preheated mold at a temperature of 180°C, carry out anionic ring-opening polymerization of caprolactam, react at a constant temperature for 30 minutes, and then cool and demould to obtain polyamide / polyethylene Acrylonitrile alloy. Break the polyamide / polyacrylonitrile alloy, then add it to 5000g of molten caprolactam at 180°C, fully dissolve and filter, the obtained insoluble matter is polyamide microspheres; the obtained filtrate is caprolactam containing 50g of polyacrylonitrile Melt mixture, add 4450g of polyacrylonitrile to the melt mixture to obtain a caprolactam melt mixture with a ...

Embodiment 3

[0025] Weigh 75g of enantholactam, heat to 105°C to melt, then add 25g of polymethyl methacrylate, stir to dissolve; after the polymethyl methacrylate is completely dissolved, turn on the vacuum pump, and carry out vacuum distillation on the above melt mixture , remove a small amount of water, then add 0.56g sodium ethoxide and 0.56g maleic anhydride, mix quickly and evenly, pour into a preheated mold with a temperature of 150°C, and carry out enantholactam anionic ring-opening polymerization reaction, constant temperature reaction After 15 minutes, it was cooled and demolded to obtain a polyamide / polymethyl methacrylate alloy. Break the polyamide / polymethyl methacrylate alloy, then add it to 2600g of molten enantholactam at 105°C, fully dissolve and filter, the obtained insoluble matter is polyamide microspheres; the obtained filtrate contains 25g The enantholactam melt mixture of polymethyl methacrylate, add 840g polyacrylonitrile to this melt mixture, obtain the polyacrylon...

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Abstract

The invention discloses an environment-friendly preparation method of polyamide microspheres. The environment-friendly preparation method comprises the following steps: heating monomer lactam of polyamide to a molten state, and adding a polymer easily dissolved in caprolactam into the lactam and fully dissolved so as to obtain a melt mixture; the melt mixture is subjected to reduced pressure distillation so as to remove trace amounts of water therein, a catalyst and a cocatalyst are added for carrying out lactam anion ring-opening polymerization, and the obtained product is demoulded so as to obtain a polyamide alloy; the polyamide alloy is broken and then added into the molten lactam, and the obtained object is fully dissolved and filtered, so that the obtained undissolved substance is polyamide microspheres; the concentration of lactam melt mixture filtrate is adjusted, so that the content of polymers is 5-50wt%, and the steps are repeated so as to cyclically prepare polyamide microspheres. According to the preparation method disclosed by the invention, molten lactam is directly used for filtering, and no organic solvent is used, so that the complex recycling and innocent treatment of spent liquor are not required to be considered, the cyclic continuous preparation of polyamide microspheres is high in efficiency and low in cost, and polyamide microspheres are good in particle size uniformity.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an environment-friendly preparation method of polyamide microspheres. Background technique [0002] In recent years, polymer microspheres with uniform size and regular shape have been widely used in the fields of functionalized carriers, chromatographic separation agents, and biomedicine. Because it contains amine and carboxyl groups, and has high strength, high chemical resistance, wear resistance, non-deformation and anti-aging properties, polyamide microspheres are widely used in solid phase diagnosis, biocatalysis, in vitro treatment, cosmetics, ink and light diffusion, etc. has been widely applied. The traditional preparation methods of polyamide microspheres include: mechanical pulverization, solution precipitation, precipitation polymerization, interfacial polymerization, suspension polymerization and microemulsion polymerization, etc., but the above...

Claims

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Application Information

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IPC IPC(8): C08G69/18C08J3/12C08L77/02
Inventor 闫东广李娇陶威周海骏
Owner 江苏瑞美福新材料有限公司
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