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A high wear-resistant silicon nitride/polyoxymethylene nanocomposite material and its preparation method

A technology of nano-composite materials and polyoxymethylene, which is applied in the field of polymers, can solve the problems of affecting the adhesion between wear-resistant modifiers and polyoxymethylene matrix, the influence of mechanical properties of composite materials, and the high viscosity of composite materials. Excellent mechanical properties, the effect of improving adhesion

Active Publication Date: 2019-04-30
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to wear-resistant polymers, there are also inorganic wear-resistant fillers such as graphite and molybdenum disulfide, but the addition of the above-mentioned wear-resistant polymers and wear-resistant fillers is generally relatively large, which will bring some defects to the polyoxymethylene material: 1. It will lead to a higher viscosity of the composite material; second, it will affect the adhesion between the wear-resistant modifier and the polyoxymethylene matrix; third, it will also have a significant impact on the mechanical properties of the composite material, which is not conducive to its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Surface treatment of nano-silicon nitride: Add nano-silicon nitride to a mixed solution composed of ammonia water and tetraethyl orthosilicate at a mass ratio of 2:1, and react at 60°C for 6 hours to obtain a mixed solution; Add dropwise the coupling agent γ-aminopropyltriethoxysilane accounting for 0.5% of the mass of nano-silicon nitride to the aforementioned mixed solution, react at 70°C for 2 hours, centrifuge, rinse repeatedly with deionized water, and dry to obtain Modified nano-silicon nitride surface treated with tetraethyl orthosilicate and coupling agent, and then made into modified nano-silicon nitride particles with a particle size of 2-5mm through dry rolling granulation equipment;

[0027] (2) Drying treatment of polyoxymethylene: dry polyoxymethylene at 90°C for 6 hours;

[0028] (3) Preparation of silicon nitride / polyoxymethylene nanocomposite material: 3 parts of modified nano-silicon nitride particles obtained by (1) surface treatment, 97 parts of ...

Embodiment 2

[0031] (1) Surface treatment of nano-silicon nitride: Add nano-silicon nitride to a mixed solution composed of ammonia water and tetraethyl orthosilicate at a mass ratio of 2:1, and react at 50°C for 8 hours to obtain a mixed solution; then drop Add γ-aminopropyltriethoxysilane as a coupling agent accounting for 1% of the mass of nano-silicon nitride, react at 80°C for 2 hours, centrifuge, rinse repeatedly with deionized water, and dry to obtain ethyl orthosilicate Modified nano-silicon nitride compounded with coupling agent surface treatment, and then made into modified nano-silicon nitride particles with a particle size of 2-5mm through dry rolling granulation equipment;

[0032] (2) Drying treatment of polyoxymethylene: dry the polyoxymethylene at 80°C for 6 hours;

[0033] (3) Preparation of silicon nitride / polyoxymethylene nanocomposite material: 1 part of modified nano-silicon nitride particles obtained by (1) surface treatment, 99 parts of polyoxymethylene and 0.05 part...

Embodiment 3

[0036] (1) Surface treatment of nano-silicon nitride: Add nano-silicon nitride to a mixed solution composed of ammonia water and tetraethyl orthosilicate at a mass ratio of 2:1, and react at 80°C for 5 hours to obtain a mixed solution; then drop Add 1.5% of the coupling agent γ-aminopropyltriethoxysilane, which accounts for 1.5% of the mass of nano-silicon nitride, react at 70°C for 5 hours, centrifuge, rinse repeatedly with deionized water, and dry to obtain ethyl orthosilicate Modified nano-silicon nitride compounded with coupling agent surface treatment, and then made into modified nano-silicon nitride particles with a particle size of 2-5mm through dry rolling granulation equipment;

[0037] (2) Drying of polyoxymethylene: dry the polyoxymethylene at 100°C for 2 hours;

[0038] (3) Preparation of silicon nitride / polyoxymethylene nanocomposite material: 5 parts of modified nano-silicon nitride particles obtained by (1) surface treatment, 95 parts of polyoxymethylene and 0.5...

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Abstract

The invention relates to a high wear-resistant silicon nitride / polyoxymethylene nanocomposite material and a preparation method thereof, which comprises 95-99 parts of polyoxymethylene, 1-5 parts of modified nano-silicon nitride particles, and 0.5-3 parts of lubricant , 0.1-1 part of antioxidant is prepared by melting, extruding and granulating through a twin-screw extruder after stirring and mixing. The surface treatment of nano-silicon nitride with tetraethyl orthosilicate and coupling agent is made into particles, which improves the dispersion of nano-silicon nitride particles in the matrix resin as an anti-wear agent, thereby improving the wear resistance. The adhesion between the agent and the polyoxymethylene matrix makes the high wear-resistant silicon nitride / polyoxymethylene nanocomposite material significantly improved in terms of wear resistance and maintains excellent mechanical properties.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a highly wear-resistant silicon nitride / polyoxymethylene nanocomposite material and a preparation method thereof. Background technique [0002] Polyoxymethylene is a kind of engineering plastic with excellent performance, known abroad as "Duracon" and "Super Steel". At present, polyoxymethylene has been widely used in electrical and electronic, machinery, instrumentation, daily light industry, automobile, building materials, agriculture and other fields, especially in new fields such as medical technology and sports equipment. [0003] Polytetrafluoroethylene (PTFE), ultra-high molecular weight polyethylene, low-density polyethylene, polyurethane, etc. are the most commonly used wear-resistant polymers, mainly because they can segregate near the upper layer of the surface of polyoxymethylene, so that the surface of polyoxymethylene and friction The friction between the surfaces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L59/00C08L83/04C08K9/06C08K3/34B29C48/92
Inventor 杨桂生苏荣锦吕励耘
Owner HEFEI GENIUS NEW MATERIALS