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Mitsui Chemicals

UHMW-PE grades offered by Mitsui Chemicals meet diverse industry needs due to the material's excellent chemical resistance, abrasion resistance, impact resistance and self-lubrication properties.

MIPELON™: Markets, applications and benefits

Conventional UHMW-PE has an average particle size in the range 100µm to 200µm. Mitsui’s innovative polymerization technology allows MIPELON™ UHMW-PE to be produced with a particle size in the range 10µm to 30µm making it one of the finest UHMW-PE. Figure 1 compares the particle size of MIPELON™ to the particle size of conventional polyethylene.



Mipelon PE
MIPELON™
Conventional PE
Conventional Polyethylene
Figure 1: MIPELON™ has a particle size of 10-30µm compared to conventional polyethylene which has a particle size of 150 - 200µm.
The high molecular weight, coupled with the small particle size, makes MIPELON™ an ideal performance additive for use in coatings, greases & lubricants, plastics, rubbers, and other materials. Addition of MIPELON™ gives products superior abrasion resistance, chemical resistance and self-lubrication qualities. MIPELON™ also improves durability of products and enhances heat and water resistance of materials when used as an additive.

Rubber Additive

MIPELON™ is used as an additive in rubber compounding for improvement of sliding properties and durability of rubber components. Addition of MIPELON™ makes the rubber wear-resistant and increases the working life of the product. Figure 6 shows the abrasion loss of rubber components produced by adding various weight percentages of MIPELON™ to the rubber compound. The component with no MIPELON™ shows the highest abrasion loss. The abrasion loss decreases as the weight percentage of MIPELON™ is increased.

Abrasion loss
Figure 2: Abrasion loss of rubber components is reduced as the weight percentage of MIPELON™ is increased


Grease

MIPELON™ particles, when added to greases and lubricants, act as micro-bearings inside the lubricating material, decreasing the coefficient of friction. The UHMW-PE spheres improve lubrication by enhancing the sliding properties of the grease. MIPELON™ is therefore ideal for the production of long-lasting, high-performance greases and lubricants, having high durability which reduce the wear on moving parts and eliminate squeaking noise. Long-lasting greases also reduce the need for frequent re-lubrication cutting down maintenance costs. Figure 4 compares the variation in coefficient of friction of standard grease to a grease containing 10% MIPELON™ (PM-200) by weight. The figure shows that the standard grease breaks down approximately 1,100 seconds into the test whereas the grease containing 10% MIPELON™ has a stable coefficient of friction even beyond 6,000 seconds.


Addition to Lubricants
Figure 3: Addition of MIPELON™ to grease reduces the coefficient of friction and increases the life of the lubricant

Coatings

Use of MIPELON™ as an additive in paints, printing inks and other industrial coatings improves their abrasion and chemical resistance, increases smoothness and enhances their self-lubrication properties. When mixed with fillers and pigments, MIPELON’s excellent dispersion properties improve the overall properties of the coating.

MIPELON™ can be used for the production of low friction coatings. Low friction coatings produce durable, slippery surfaces and reduce surface wear. These coatings show better resistance to corrosion and are easy to clean. The coefficient of friction of surface coatings is reduced by the addition of MIPELON™. Figure 2 compares the coefficient of friction of normal paint with paint containing MIPELON™ additive (PM-200). Addition of MIPELON™ (PM-200) produces a smooth matt finish reducing the coefficient of friction by about 85%.


Low friction cofficient
Figure 4: Addition of MIPELON™ to paints drastically reduces the coefficient of friction


Polytetrafluoroethylene (PTFE) is commonly used to reduce friction coefficient of paints. PTFE, however, has poor dispersibility and tends to settle out. Figure 3 shows the results of a lab experiment comparing the dispersibility of PTFE to MIPELON™. PTFE powder begins to settle out of the polyurethane based paint within 24 hours due to the difference in specific gravity. Use of MIPELON™ UHMW-PE grades (PM-200 and XM-220) produces excellent dispersibility and stays uniformly dispersed in the coating even after 72 hours.

Standing test tube cofficient
Figure 5: MIPELON™ shows excellent dispersibility in polyurethane paint


Other Applications

Sintering MIPELON™ UHMW-PE produces an excellent porous filter medium due to the materials small particle size. Various grades of MIPELON™ can be sintered to produce filters with varying pore sizes.

MIPELON™ is available in grades conforming to FDA regulations (CFR Title 21 Section 177. 1520. (c) 2.2) and EU regulations for food safety. It is therefore well-suited to the production of coatings, lubricants, plastics and rubbers for use in the food industry.

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Downloads from Ultra-high molecular weight polyethylene technologies

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