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Highly ductile, abrasive-wearable self-lubricant polyformaldehyde material and its preparation method

A polyoxymethylene material, self-lubricating technology, applied in the field of high wear-resistant self-lubricating polyoxymethylene material and its preparation, high toughness, to achieve the effect of less dosage, improved toughness and friction and wear performance, and simple process

Active Publication Date: 2007-05-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report of polyoxymethylene modified polyoxymethylene in current literature

Method used

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  • Highly ductile, abrasive-wearable self-lubricant polyformaldehyde material and its preparation method
  • Highly ductile, abrasive-wearable self-lubricant polyformaldehyde material and its preparation method
  • Highly ductile, abrasive-wearable self-lubricant polyformaldehyde material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dry 396g of copolymerized polyoxymethylene in an oven at 90°C for 4 hours, add 4g of polyethylene oxide with a molecular weight of 20,000, 1.2g each of antioxidant 264, aluminum hydroxide and melamine, and mix them evenly in a high-speed mixer. Melt blending and extrusion at a temperature of 170°C, the extrudate is rapidly cooled below the crystallization temperature of polyethylene oxide at a cooling rate of 60°C / min, and a structure with polyethylene oxide crystal layers intermingled inside polyoxymethylene spherulites is obtained polyoxymethylene material. Its notched impact strength is 7.5kJ / m 2 , The tensile strength is 54MPa, the elongation at break is 50%, the friction coefficient is 0.21, and the wear scar width is 4.5mm.

Embodiment 2

[0033] Dry 360g of copolymerized polyoxymethylene in an oven at 90°C for 6 hours, add 40g of polyethylene oxide resin with a molecular weight of 500,000, 2g of antioxidant 1010, 2g of dicyandiamide, and 1.5g of magnesium hydroxide into a high-speed mixer and mix evenly Afterwards, melt blending and extrusion at a temperature of 210°C, the extrudate is rapidly cooled to below the crystallization temperature of polyoxyethylene, and the cooling rate is 50°C / min, and polyoxymethylene spherulites with a polyoxyethylene crystal layer intercalated are obtained. Polyoxymethylene material with intermediate structure. Its notched impact strength is 16kJ / m 2 , The tensile strength is 43MPa, the elongation at break is 82%, the friction coefficient is 0.17, and the wear scar width is 3mm.

Embodiment 3

[0035] Add 80g of polyethylene oxide resin with a molecular weight of 6.8 million, 320g of copolymerized polyoxymethylene, 1.8g each of nylon-6, magnesium hydroxide and melamine after drying at 90°C for 4 to 6 hours, and mix them in a high-speed mixer After uniformity, put it into a twin-screw extruder at a temperature of 210°C for melt blending and extrusion, and rapidly cool the extruded product below the crystallization temperature of polyethylene oxide at a cooling rate of 80°C / min to obtain crystallized polyethylene oxide A polyoxymethylene material with a structure in which layers are entrapped inside polyoxymethylene spherulites. Its notched impact strength is 14kJ / m 2 , The tensile strength is 45MPa, the elongation at break is 75%, the friction coefficient is 0.18, and the wear scar width is 4.03mm.

[0036] Table 1 is the mechanical properties and friction and wear properties of pure polyoxymethylene and modified polyoxymethylene of the present invention

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Abstract

The invention discloses a high-density, abrasion-proof self-lubricating polyformaldehyde material and making method, which comprises the following steps: drying 50-99% polyformaldehyde at 60-90 deg.c for 4-6h; adding 1-50% polyethylene oxide, 0.01-1% polyformaldehyde stabilizer, 0.01-1% formaldehyde and 0.01-1% formaldehyde adsorbent into high-speed stirrer to blend evenly; fusing at 170-200 deg.c to squeeze; cooling the squeezed material below crystallizing temperature of polyethylene oxide with cooling speed at 50-80deg.c / min; obtaining the product with high flexibility between the interior of polyformaldehyde spherulite and spherulite.

Description

technical field [0001] The invention relates to a high-toughness, high-abrasion self-lubricating polyoxymethylene material and a preparation method thereof, belonging to the field of polymer processing. Background technique [0002] Polyoxymethylene (polyoxymethylene) is an important engineering plastic with excellent physical and mechanical properties, such as high strength, high stiffness, outstanding fatigue resistance, creep resistance, self-lubrication and wear resistance. One of the resin varieties whose medium specific strength is closer to that of metal, and is often used as a substitute for non-ferrous metals and alloys. POM is divided into homopolymerization type and copolymerization type. Homopolymerization type POM was developed by American Dupond Company in 1959, and copolymerization type POM was developed by American Cekanese Company in 1961. POM is very easy to crystallize during the molding process, resulting in larger spherulites with high notch sensitivity...

Claims

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Application Information

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IPC IPC(8): C08L59/02C08K5/3492C08L71/02C08K3/22
Inventor 王琪白时兵刘靖琳华正坤
Owner SICHUAN UNIV
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