An analysis of how to improve the wear resistance of engineering plastics.

Solid lubricant
and metal, polymer material wear process basically does not involve the friction process of material oxidation and electrochemical corrosion, relatively simple, but to solve the material difference is quite large polymer material wear resistance is still challenging.
from soft, elastic rubber to metal-like POMs, from ink coatings with a thickness of 2um to PEEK for large valves, solid lubricants represented by powder wax and PTFE play an important role in these areas.
as we know, the wear of non-metallic materials is mainly
adhesive wear
and
wear and

.
adhesion wear
refers to the relative movement, because of solid-phase welding, contact point material from one surface to another.
abrasive wear
refers to hard particles or micro protrusions on harder materials that cause surface abrasions or surface material to fall off.
In the field of engineering plastics
,
due to the generally poor thermal conductivity of polymer materials, local heat generated in the friction process is easier to reach the melting point or softening point of engineering plastics, when the friction between solids becomes and molten polymers on the friction opposite the solid resistance, resulting in greater adhesion wear, often under the electric mirror is shown as fish scales.
with the addition of PTFE micro-powders or laminated lubricants such as molybdenum desulfurization, frictional and frictional heat are reduced due to reduced coefficients of friction, and adhesive wear is controlled.
In the PTFE micro-powder addition is relatively large, the transfer film between friction surfaces becomes relatively smooth, reflecting better wear resistance
,
at this time the wear mode is mainly friction opposite the solid to the polymer formation of abrasive particle wear, often in the electric mirror is shown as a plow trench.
For engineering plastics filled with glass fiber, glass fiber will be crushed on the friction surface to form a new grain, glass fiber technical indicators and filling, will have a greater impact on the wear resistance of engineering plastics.
the use of wear-resistant engineering plastics is a very important factor, the use of temperature, load, friction speed, wet and dry conditions are very relevant. Take
PA6
as an example, the coefficient of friction is the largest at medium loads and the
coefficient
150 degrees is the largest.
(test is carried out at room temperature, under water lubrication conditions, in a ring-block test machine)
(the friction coefficient of nylon and temperature relationship)
In the current domestic modified wear-resistant engineering plastics, mostly for the addition of molybdenum desulfurization, its wear-resistant machinery is dependent on its chip crystalline structure, can only produce black or gray products, and under the conditions of water presence, radon due to water absorption lubricity will be greatly reduced. The use of PTFE (Teflon) micro-powder can solve this problem.
PTFE micro-powder
has a lower molecular weight, the average molecular particle size of up to 1.5 microns or so, the appearance of white powder, with high molecular weight Teflon resin all excellent performance, its outstanding features are:
particles Spout forming, non-sticking between particles, excellent dispersion, small and uniform particle size, larger than the surface area, low volume density, high oil absorption value, low viscosity dispersed in solvents, can be evenly mixed with other powders and liquid materials.
the use of
PTFE micro-powder enhances the performance of the main material, such as:
1) wear resistance, friction resistance and scratch resistance
2) easy to deostase characteristics
3) anti-adhesion properties
4) lubrication properties (for engineering plastics) Modified)
5) Anti-friction, anti-wear performance
PTFE micro-powder improves some of the properties of the main material (i.e. engineering plastics, general purpose plastics, coatings, inks, lubricants, films, rubber and lubricants), even with small additions. This is because these micro-powders are resistant to harsh processing conditions and have virtually the same properties when they enter the main resin.
add a certain percentage of PTFE micro-powder to provide:
. 1. Self-lubricating wear resistance
2.Higher release performance
3.Faster processing speed
For plastics, high content is required when products are required to have low friction, PV values and wear resistance. A higher powder content is also required when used as a thickener in lubricants such as grease. The PTFE fill mix is processed in the same conditions as the main material (e.g. plastic, rubber, etc.).
Nanjing Tianshi produces a variety of specifications of
. PTFE
micro-powder, can adapt to different types of wear-resistant engineering plastic systems, from the lower temperature
POM
to the high temperature
PEEK
have relevant applications, but also equipped with plastic wear-resistant laboratory machine, high multiplied microscope and other equipment, can assist customers to analyze the wear process encountered in a variety of problems.
.