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A kind of preparation method of polytetrafluoroethylene-based composite nano antibacterial dispersant

The technology of polytetrafluoroethylene and polytetrafluoroethylene micropowder is applied in the field of preparation of composite nano-antibacterial dispersants, which can solve the problems of high energy consumption, difficulty in adding powder, and high cost of nano-silver, and achieves convenient operability and good dispersion. The effect of the properties, the preparation method is simple

Active Publication Date: 2021-02-26
SUZHOU NORSHINE PERFORMANCE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the main body of the carrier used is PE wax, it is difficult to achieve a good anti-adhesion effect in the addition of plastics, inks, or coatings, and the cost of using commercialized nano-silver is relatively high. In addition, melting treatment also increases a lot. Energy consumption, in addition, it is difficult to add the prepared powder in actual use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] A preparation method based on polytetrafluoroethylene composite nano antibacterial dispersant, comprising the steps of:

[0019] Step 1: irradiate polytetrafluoroethylene with a high dose in the air atmosphere, form a fine powder with a particle size of 200nm after airflow crushing, and stack it in a ventilated environment for at least one month. The bond is converted to a carboxyl group. The polytetrafluoroethylene raw material is preferably polytetrafluoroethylene prepared by dispersion polymerization.

[0020] Step 2: Disperse the polytetrafluoroethylene micropowder in a solvent through high-speed stirring or ultrasonic dispersion to prepare a dispersion liquid. The solvent is at least one solvent selected from methanol, ethanol, n-propanol, isopropanol and n-butanol. The dispersion liquid includes a solvent and the polytetrafluoroethylene micropowder. The mass fraction ratio of the polytetrafluoroethylene micropowder and the solvent is 1:4~16; the mass fraction o...

Embodiment 1

[0025] (1) The dispersed polytetrafluoroethylene resin was irradiated with a GJ-2 type electron accelerator, and the irradiation dose was 60Mrad. After completion, it was pulverized by a pulverizer to obtain irradiated polytetrafluoroethylene micropowder with a particle size of about 200nm, which was stacked for one month.

[0026] (2) 100 parts of polytetrafluoroethylene micropowder were dispersed in 400 parts of ethanol solvent through ultrasonic and high-speed stirring to prepare a dispersion liquid.

[0027] (3) Add 28% ammonia water dropwise, adjust the pH of the dispersion to 7.4, and continue stirring for 2 hours.

[0028] (4) Add 0.5 parts of 10% AgNO 3 Ethanol solution, continue to stir for 2h.

[0029] (5) Add 1 part of 10% ascorbic acid ethanol solution, continue to stir for 5 hours, the solution becomes light gray, and obtain the solution of the polytetrafluoroethylene-based composite nano-antibacterial dispersant.

[0030] (6) Add 10 parts of the polytetrafluoro...

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Abstract

The present invention discloses a preparation method of a compound nano-antibacterial dispersant based on polytetrafluoroethylene. Polytetrafluoroethylene micropowder is prepared into dispersion liquid; a silver nitrate solution is added under an alkaline condition to produce nano-silver particles on the surface of the micropowder in situ to form the compound nano-antibacterial dispersant based onpolytetrafluoroethylene. The compound nano-antibacterial dispersant based on polytetrafluoroethylene has good dispersibility and convenient operability in a solvent, can be directly used as a stain-resistant and antibacterial spray, and can also be added in coating and printing ink to be prepared into wear-resistant, anti-fouling and antibacterial nano-compound materials.

Description

technical field [0001] The invention relates to the field of macromolecular antibacterial nanomaterials, in particular to a preparation method of a polytetrafluoroethylene-based composite nanoantibacterial dispersant. Background technique [0002] PTFE micropowder is often added as lubricating oil, ink, and coating to improve the anti-sticking, wear-resistant, lubricating, and friction-reducing effects of lubricating oil, ink, and coating. Usually, PTFE micropowder is mainly prepared by converting high-molecular-weight PTFE into low-molecular-weight PTFE by means of irradiation such as electron beams, and then crushing. These irradiated low-molecular-weight polytetrafluoroethylenes have almost the same service temperature range, weather resistance, chemical resistance, sliding properties and non-stick properties as high-molecular-weight polytetrafluoroethylenes, but the molecular weight decreases after irradiation. , increased crystallinity, better pulverization processabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/18C09D5/16C09D5/14C08J7/04C08L69/00C08L77/00
CPCC08J2369/00C08J2377/00C08J2427/18C08K2003/0806C08K2201/011C09D5/14C09D5/16C09D127/18C08J7/0427C08K3/08
Inventor 潘永明
Owner SUZHOU NORSHINE PERFORMANCE MATERIAL