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Wear resistant self-lubricating polyformaldehyde and preparation method thereof

A polyoxymethylene and self-lubricating technology, applied in the field of polymer material processing, can solve the problems of low surface free energy and poor compatibility of PTFE, and achieve excellent wear resistance, self-lubrication and mechanical properties, good molecular compatibility, good The effect of toughening

Active Publication Date: 2012-09-19
YANKUANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent ZL03151026.4 uses polyurethane elastomers, potassium titanate whiskers, and glass microspheres to strengthen and toughen POM / PTFE alloys when preparing them. However, the surface free energy of PTFE is very low, and its compatibility with POM and other materials is poor. PTFE must be given a special surface treatment

Method used

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  • Wear resistant self-lubricating polyformaldehyde and preparation method thereof
  • Wear resistant self-lubricating polyformaldehyde and preparation method thereof
  • Wear resistant self-lubricating polyformaldehyde and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 prepares wear-resistant self-lubricating polyoxymethylene

[0029] Mix 10Kg of POM resin with 30g of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, 20g of melamine, 20g of magnesium hydroxide, 2Kg of polytetrafluoroethylene micropowder, thermoplastic fluorine Add 1.5Kg of polyester elastomer, 100g of calcium carbonate treated with a coupling agent, and 10g of glycerol monostearate into a high-speed mixer for mixing, then melt and knead with a vented twin-screw extruder, and extrude to granulate, namely Obtain wear-resistant self-lubricating polyoxymethylene, wherein, the screw speed: 50 rpm; the temperature of each section of the barrel: 140 ~ 200 ℃. The product has a tensile strength of 45MPa and a notched impact strength of 10KJ / m 2 .

Embodiment 2

[0030] Embodiment 2 prepares wear-resistant self-lubricating polyoxymethylene

[0031] Mix 10Kg of POM resin with N,N'-bis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl]hexamethylenediamine 20g, dicyandiamide 10g, magnesium oxide 10g, polytetramethylene Add 3Kg of vinyl fluoride micropowder, 3Kg of thermoplastic fluorine-containing polyester elastomer, 200g of silicon dioxide treated by coupling agent, and 20g of bisstearamide into a high-speed mixer, and then melt and knead with a vented twin-screw extruder. Extrude and granulate to obtain wear-resistant self-lubricating polyoxymethylene, the screw speed is 150 rpm; the temperature of each section of the barrel is 160-220°C. The product has a tensile strength of 33MPa and a notched impact strength of 20KJ / m 2 .

Embodiment 3

[0032] Embodiment 3 prepares wear-resistant self-lubricating polyoxymethylene

[0033] Mix 10Kg of POM resin with 10g of β-(4-hydroxy-3,5-di-tert-butylphenyl) octadecyl propionate, 70g of urea, 7g of calcium silicate, 1Kg of polytetrafluoroethylene micropowder, thermoplastic fluorine-containing polystyrene Add 2.5Kg of ester elastomer, 400g of talc powder treated with coupling agent, and 30g of pentaerythritol tristearate into a high-speed mixer for mixing, then melt and knead with a vented twin-screw extruder, extrude and granulate, and obtain Wear-resistant self-lubricating polyoxymethylene, screw speed, 100 rpm; temperature of each section of the barrel, 170-210 °C. The product has a tensile strength of 35MPa and a notched impact strength of 15KJ / m 2 .

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Abstract

The invention discloses wear resistant self-lubricating polyformaldehyde, which is prepared by the following components through a preparation method comprising the following steps: adding 100 parts of POM (polyoxymethylene) resin, 0.1-0.3 part of antioxidant, 0.05-2 parts of formaldehyde absorber, 0.05-0.5 part of formic acid absorber, 15-30 parts of thermoplastic fluorine-containing polyester elastomer, 10-30 parts of polytetrafluoroethylene micro-powder, 0.1-5 parts of inorganic nano-particles subjected to surface treatment and 0.05-0.5 part of lubricant into a high-speed mixer and mixing, melting and mixing by an exhaust type double-screw extruder, extruding and pelleting to obtain the polyformaldehyde, wherein a rotating speed of screws is 50-200 revolutions per minute, and the temperature of a charging barrel is 140-220 DEG C. According to the invention, the thermoplastic fluorine-containing polyester elastomer with excellent strength and toughness and better compatibility with POM and PTFE (polytetrafluoroethylene) and the inorganic nano-particles are composited with POM and PTFE, so that a tensile strength of the polyformaldehyde reaches 45 MPa, and a notch impact strength reaches about 20 KJ / m<2>.

Description

technical field [0001] The invention relates to a wear-resistant self-lubricating polyoxymethylene and a preparation method thereof, belonging to the field of polymer material processing. Background technique [0002] Polyoxymethylene (POM) is based on [-CH 2 -O-] Main chain, unbranched, high melting point, high density, high crystallization thermoplastic engineering plastics, with high strength and rigidity, excellent creep resistance, fatigue resistance, inherent lubricity, wear resistance It is the closest to metal in engineering plastics, and can be used to replace copper, aluminum, zinc and other non-ferrous metals and alloy products. It is widely used in electronics, automobiles, light industry, machinery, chemicals, and building materials. and other fields. [0003] With the wide application of POM in aviation, automobile, electrical and electronic, machinery, construction and other industries and the development of various equipment in the direction of miniaturizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L75/04C08K13/06C08K9/06C08K9/04C08K3/26C08K3/36C08K3/34C08K5/3492C08K5/31C08K5/21C08K5/25C08K3/22C08K5/521
Inventor 芮胜波叶林陈爱忠赵晓文石家新徐胜王广义候世荣李峥
Owner YANKUANG GRP CO LTD
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