High-toughness wear-resistant polyformaldehyde composition and preparation method thereof

A polyoxymethylene compound, high wear-resistant technology, applied in the field of polyoxymethylene compound and its preparation, can solve the damage of mechanical properties such as tensile strength and flexural strength, limit the application of polyoxymethylene modified products, and the impact resistance of polyoxymethylene limited and other problems, to achieve the effect of improving wear resistance, high toughness and wear resistance, and reducing wear rate

Active Publication Date: 2010-11-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the improvement of the impact resistance of polyoxymethylene by the above-mentioned modification methods is very limited, and the traditional elastomer toughening method inevitably reduces the rigidity of the material while improving the toughness, making its tensile strength, bending strength and other mechanical properties Destroyed, thus limiting the application of polyoxymethylene modified products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Take polyoxymethylene copolymer, polyethylene oxide, polytetrafluoroethylene fiber, antioxidant, formaldehyde absorbent, and blend all raw materials according to the following composition and mass percentage:

[0025] Polyoxymethylene 84.4wt.%

[0026] Polyethylene oxide 10.0wt.%

[0027] PTFE fiber 5.0wt.%

[0028] Antioxidant 1010 0.25wt.%

[0029] Antioxidant 168 0.25wt.%

[0030] Dicyandiamide 0.1wt.%

[0031] The components in the above ratio are placed in a mixer and fully mixed, and then the mixture is melt-blended, extruded, cooled and granulated through a twin-screw extruder granulator. The barrel temperature is 170°C, 172°C, 175°C, 173°C respectively, and the head temperature is set at 175°C. Wherein, during the extrusion process, the screw speed is 190 rpm, the melt pressure is 40 MPa, and the torque is 60 N·m. The prepared pellets were fully dried in a vacuum oven at 80°C, and injected into standard mechanical property test specimens and friction test sp...

example 2

[0033] Take polyoxymethylene copolymer, polyethylene oxide, polytetrafluoroethylene fiber, antioxidant, formaldehyde absorbent, and blend all raw materials according to the following composition and mass percentage:

[0034] Polyoxymethylene 79.4wt.%

[0035] Polyethylene oxide 10.0wt.%

[0036] PTFE fiber 10.0wt.%

[0037] Antioxidant 1010 0.25wt.%

[0038] Antioxidant 168 0.25wt.%

[0039] Dicyandiamide 0.1wt.%

[0040] The components in the above ratio are placed in a mixer and fully mixed, and then the mixture is melt-blended, extruded, cooled and granulated through a twin-screw extruder granulator. The barrel temperature is 170°C, 172°C, 175°C, 173°C respectively, and the head temperature is set at 175°C. Wherein, during the extrusion process, the screw speed is 190 rpm, the melt pressure is 40 MPa, and the torque is 60 N·m. The prepared pellets were fully dried in a vacuum oven at 80°C, and injected into standard mechanical property test specimens and friction test...

example 3

[0042] Get homopolyoxymethylene, polyoxyethylene, polytetrafluoroethylene fiber, antioxidant, formaldehyde absorbent, and blend all raw materials according to the following composition and mass percentage:

[0043] Polyoxymethylene 74.4wt.%

[0044] Polyethylene oxide 15.0wt.%

[0045] PTFE fiber 10.0wt.%

[0046] Antioxidant 1010 0.25wt.%

[0047] Antioxidant 168 0.25wt.%

[0048] Dicyandiamide 0.1wt.%

[0049] The components in the above ratio are placed in a mixer and fully mixed, and then the mixture is melt-blended, extruded, cooled and granulated through a twin-screw extruder granulator. The barrel temperature is 170°C, 172°C, 175°C, 173°C respectively, and the head temperature is set at 175°C. Wherein, during the extrusion process, the screw speed is 190 rpm, the melt pressure is 40 MPa, and the torque is 60 N·m. The prepared pellets were fully dried in a vacuum oven at 80°C, and injected into standard mechanical property test specimens and friction test specimens...

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PUM

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Abstract

The invention discloses a high-toughness wear-resistant polyformaldehyde composition and a preparation method thereof, and belongs to the field of engineering plastic plasticizing and functional modification technology and preparation. The polyformaldehyde composition comprises the following components in percentage by weight: 48.0 to 84.4 percent of polyformaldehyde, 10.0 to 30.0 percent of polyoxyethylene, 5.0 to 20.0 percent of polytetrafluoroethylene fiber, 0.25 to 0.5 percent of antioxidant 1010, 0.25 to 0.5 percent of antioxidant 168 and 0.1 to 1.0 percent of formaldehyde absorbent. The preparation method comprises the following steps of: drying the polyformaldehyde, the polytetrafluoroethylene fiber and polyethylene oxide; placing each component in a stirrer for full mixing according to the proportion; melt-blending and extruding the mixture through a twin screw extrusion pelletizer; and cooling and pelletizing the mixture. The prepared polyformaldehyde composition is applied to manufacturing of the mechanical components with high requirements on impact resistance and wear resistance.

Description

technical field [0001] The invention relates to a polyoxymethylene compound and a preparation method thereof, in particular to a polyoxymethylene compound with high impact resistance and high wear resistance and a preparation method thereof, belonging to the toughening and functional modification technology of engineering plastics and the field of preparation. Background technique [0002] POM has excellent mechanical properties. It has high impact strength, high elastic modulus and rigidity, good fatigue resistance and excellent creep resistance. Good dimensional stability and formability. However, due to its special molecular chain structure, polyoxymethylene is very easy to crystallize during the molding process, forming large-sized spherulites; when the material is impacted, the spherulites are easy to form stress concentration points, resulting in material damage. Therefore, polyoxymethylene is very sensitive to the notch, and its notched impact strength is low, so i...

Claims

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Application Information

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IPC IPC(8): C08L59/02C08L59/04C08L71/02C08L27/18C08K5/31C08K5/3492B29C47/92B29C48/92
CPCB29C48/04B29C48/92B29C2948/92514B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895B29C2948/92904
Inventor 汪晓东高扬武德珍
Owner BEIJING UNIV OF CHEM TECH
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