Polytetrafluoroethylene-modified polyethylene wax with core-shell structure and preparation process thereof

A polytetrafluoroethylene and polyethylene wax technology, applied in the direction of coating, can solve the problems of easy sedimentation, incompatibility, heavy specific gravity, etc., and achieve good lubrication, wear resistance and chemical inertness, easy to disperse, and low density. Effect

Active Publication Date: 2011-10-12
SUZHOU NORSHINE PERFORMANCE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, due to the low surface energy of polytetrafluoroethylene itself, high hydrophobicity and oil repellency, coupled with its large specific gravity, its dispersion stability in the solution system is very poor, which affects its performance to a large extent. Further application of additives
[0006] WO01/64799 mentions mixing polytetrafluoroethylene with polyolefin, hoping to add the excellent properties of polytetrafluoroethylene into polyolefin wax powder, but this simple mixing cannot fully exert the properties of polytetrafluoroethylene itself. excellent performance
A

Method used

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  • Polytetrafluoroethylene-modified polyethylene wax with core-shell structure and preparation process thereof
  • Polytetrafluoroethylene-modified polyethylene wax with core-shell structure and preparation process thereof
  • Polytetrafluoroethylene-modified polyethylene wax with core-shell structure and preparation process thereof

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Experimental program
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Effect test

Embodiment 1

[0076] Firstly, the polytetrafluoroethylene resin JF-4D was irradiated and degraded. The GJ-2 electron accelerator was used to control the irradiation dose at 50 Mrad. The degraded polytetrafluoroethylene resin is subjected to an exhaust and degassing process to remove small molecular gases generated by degradation. Then use jet mill QYF-600 to continue to grind PTFE until the average aggregated particle size is 4 μm, and the maximum aggregated particle size is 15 μm, and the particle size is measured by laser diffraction on the MS2000 type particle size analyzer produced by Malvern ( figure 1 ). From electron micrographs ( figure 2 ) It can also be seen that the ground PTFE is formed by agglomeration of nano-scale small particles, and the size of the particles is about 200 nanometers.

[0077] Add the obtained polytetrafluoroethylene fine powder and polyethylene wax powder D-9 into a high-speed mixer at a weight ratio of 1:6 and stir at high speed for 5 minutes, wherein 2 ...

Embodiment 2

[0082] Similarly, PTFE is degraded by irradiation as in Example 1, wherein the irradiation dose is controlled to be 20 Mrad. Next, the PTFE is ground and pulverized to an average aggregate particle size of 4 μm and a maximum aggregate particle size of 15 μm. The obtained PTFE fine powder is blended at a high speed with polyethylene wax powder D-9, wherein PTFE is 1kg, polyethylene wax powder is 12kg, and the stirring speed is 1300rpm, stirred for 5 minutes, and PTFE modified PE wax powder can be obtained equally. Its average particle size is 9 μm. Figure 7-8 is his electron microscope photo, in which Figure 8 is a magnified photograph of a single particle.

Embodiment 3

[0084] Similarly, PTFE is degraded by irradiation as in Example 1, wherein the irradiation dose is controlled to be 50Mrad. Next, the PTFE is ground and pulverized to an average aggregate particle size of 3 μm and a maximum aggregate particle size of 14 μm. See Figure 9 Middle curve 1. Use polyethylene wax powder WN-1495 with an average particle size of 5.5 μm and a maximum particle size of 14 μm, see Figure 9 Middle curve 2. The obtained PTFE fine powder is blended with polyethylene wax powder WN-1495 at a high speed, wherein PTFE is 2kg, polyethylene wax powder is 10kg, the stirring speed is 1300rpm, stirred for 5 minutes, and PTFE modified PE wax powder can also be obtained. Its average particle size is 5.5μm, and the maximum particle size is 15.5um ( Figure 9 Curve 3). Also in the scanning electron microscope photos, we can also clearly see that PTFE is completely coated on the surface of PE wax powder in the form of nano-spheres. Figure 10-11 It is a scanning el...

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Abstract

The invention provides polytetrafluoroethylene-modified polyethylene wax powder, which has a core-shell structure, wherein the core comprises polyethylene wax powder with an average particle size smaller than 30 mu m and the shell comprises polytetrafluoroethylene with an average particle size of 1-1000 nm. The polytetrafluoroethylene-modified polyethylene wax powder provided by the invention hasthe core-shell structure, and polytetrafluoroethylene is wrapped on the surface of the polyethylene wax powder in a form of very small nanoparticles. Because of low density and easy dispersion of thepolyethylene wax powder, polytetrafluoroethylene is well dispersed by virtue of the excellent dispersion performance of the polyethylene wax powder and very stably suspends in a solution system without settlement.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene modified polyethylene wax and a preparation process thereof. Background technique [0002] Polytetrafluoroethylene (English abbreviation is Teflon or [PTFE, F4]), known as / commonly known as "Plastic King", Chinese trade name "Teflon", "Teflon" (teflon), "Teflon" , "Teflon", "Teflon" and so on. It is a high-molecular compound polymerized by tetrafluoroethylene, which has excellent chemical stability, corrosion resistance, sealing, high lubrication and non-stickiness, electrical insulation and aging resistance, etc. [0003] Polyethylene wax not only has similar chemical properties and excellent electrical properties to polyethylene, but also has the characteristics of wax. It has the characteristics of high melting point, high hardness, low melt viscosity and good processing fluidity. Polyethylene wax products are white flakes or powders, odorless, non-toxic, non-corrosive, and have excellent lubricit...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L27/18C09D123/06
Inventor 许少华
Owner SUZHOU NORSHINE PERFORMANCE MATERIAL
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