High wear resistance high hardness polyformaldehyde composition and preparation method thereof

A polyoxymethylene composition and polyoxymethylene technology are applied in the field of composite materials, which can solve the problems of complex modification process of silicon carbide, lack of data support, poor modification effect, etc., and achieve high hardness, improved dispersibility, and improved hardness. Effect

Active Publication Date: 2015-03-18
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Silicon carbide is easy to agglomerate, and the interface compatibility with POM is poor, so it can be filled directly, and the modification effect is not good;
[0008] 2. The modification process of silicon carbide is complicated and costly, and it is difficult to produce on a large scale;
[0009] 4. Silicone oil, polytetrafluoroethylene and other additives are added to POM, although the wear resistance of the material will be improved, but the hardness of the material will be reduced;
[0010] 5. It is relatively rare to see research on improving the wear resistance and hardness of POM at the same time, or there is a lack of relevant data support

Method used

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  • High wear resistance high hardness polyformaldehyde composition and preparation method thereof
  • High wear resistance high hardness polyformaldehyde composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take the following materials by weight:

[0048] 100 parts of polyoxymethylene, 10 parts of treated green silicon carbide, 0.1 parts of white oil, 0.2 parts of calcium stearate, antioxidant 1010: 0.3 parts, antioxidant 168: 0.6 parts, 1 part of melamine formaldehyde condensate, oxidation 0.2 parts of magnesium, 0.3 parts of diatomaceous earth; dry polyoxymethylene at 80°C for 3 hours, then add the above-mentioned other materials into a high-speed mixer and mix;

[0049] Use a vented co-rotating twin-screw extruder to melt and blend, extrude and granulate, the screw speed is 280 rpm, and the barrel temperature (temperature) is:

[0050] Hopper Zone 1, Zone 2, Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

[0051] Room temperature 165 170 175 180 185 185 190 190 190 185.

Embodiment 2

[0053] Take the following materials by weight:

[0054] 100 parts of polyoxymethylene, 20 parts of treated green silicon carbide (the treatment method is the same as in Example 1), 0.2 parts of white oil, 0.4 parts of calcium stearate, antioxidant 2246: 0.4 parts, antioxidant 168: 0.4 parts, 0.8 parts of melamine-formaldehyde condensate, 0.3 parts of magnesium oxide, and 0.2 parts of titanium dioxide; dry polyoxymethylene at 80°C for 3 hours, then add the above-mentioned other materials into a high-speed mixer and mix;

[0055] A vented co-rotating twin-screw extruder is used for melt blending, extrusion and granulation, the screw speed is 210 rpm, and the barrel temperature (°C) is:

[0056] Hopper Zone 1, Zone 2, Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

[0057] Room temperature 160 165 170 170 175 175 180 180 180 175.

Embodiment 3

[0059] Take the following materials by weight:

[0060] 100 parts of polyoxymethylene, 5 parts of treated green silicon carbide (the treatment method is the same as in Example 1), 0.1 part of white oil, 0.2 part of calcium stearate, 245 antioxidants: 0.6 parts, 168 antioxidants: 0.3 parts, 0.5 part of melamine, 0.4 part of magnesium oxide, and 0.1 part of diatomaceous earth. Dry the polyoxymethylene at 80°C for 3 hours, then add the above-mentioned other materials into the high-speed mixer and mix;

[0061] A vented co-rotating twin-screw extruder is used for melt blending, extruding and granulating, the screw speed is 250 rpm, and the barrel temperature (°C) is:

[0062] Hopper Zone 1, Zone 2, Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

[0063] Room temperature 160 170 170 175 180 180 185 185 185 180.

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Abstract

The invention belongs to the technical field of composite material, and relates to a polyformaldehyde composition and a preparation method thereof. The polyformaldehyde composition consists of the following materials by weight: 100 parts of polyformaldehyde, 5-20 parts of green silicon carbide, 0.1-0.2 part of white oil, 0.2-0.4 part of calcium stearate, 0.3-0.6 part of a main antioxidant, 0.3-0.6 part of an auxiliary antioxidant, 0.5-1part of a formaldehyde absorbent, 0.2-0.4 part of a formic acid absorbent and 0.1-0.3 part of a nucleating agent. Compared with the prior art, the polyformaldehyde composition prepared by the invention has the advantages that abrasion index is low, and the hardness is increased significantly.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a polyoxymethylene composition and a preparation method thereof. Background technique [0002] Polyoxymethylene (POM) has excellent fatigue resistance and creep resistance among engineering plastics, and has low friction coefficient, wear resistance, self-lubrication, and also has good rigidity and strength. It is widely used in the preparation of gears, bearings and other parts. device. In order to adapt to some special use environments, the wear resistance and hardness of POM must be further improved to meet the performance requirements of the material, and related research has been reported. [0003] Silicon carbide is a superhard inorganic material with a Mohs hardness of up to 9.5. According to different production methods, it can be divided into black silicon carbide and green silicon carbide. Green silicon carbide has a higher hardness than black silicon carbid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08K13/06C08K9/06C08K9/04C08K3/34C08K5/01C08K5/098C08K5/3492C08K3/22B29C47/92B29C48/92
Inventor 杨桂生王贻孙
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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