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A kind of preparation method of wear-resistant nylon 66 containing antioxidant

An antioxidant, nylon technology, applied in the field of preparation of wear-resistant nylon 66, can solve the problems such as the inability to significantly improve the wear resistance of nylon 66, the inability to prevent the oxidative deterioration of molybdenum disulfide, and the easy failure of molybdenum disulfide, etc. Excellent performance, long service life and good wear resistance

Active Publication Date: 2015-12-02
宁波锦地工程塑料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, molybdenum disulfide is easily oxidized into molybdenum trioxide crystals without wear resistance at high temperatures.
Due to the high temperature of nylon 66 during processing, molybdenum disulfide is prone to failure, resulting in no significant improvement in the wear resistance of nylon 66
Ordinary organic antioxidants cannot prevent the oxidation and deterioration of molybdenum disulfide during processing, so it is necessary to find a new type of antioxidant to inhibit the oxidation of molybdenum disulfide during high-temperature processing, in order to maximize the wear resistance of nylon 66

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step (1). Weigh 1000 grams of nylon 66, 150 grams of molybdenum disulfide, 20 grams of titanium dioxide, 3 grams of antioxidant B225, and 5 grams of titanium metal powder.

[0025] Step (2). The above-mentioned raw materials were added to a high-speed mixer with a rotation speed of 300 rpm and mixed for 10 minutes to obtain a mixture.

[0026] Step (3). Add the above-mentioned mixture to a twin-screw extruder with a screw speed of 100 rpm to extrude and granulate. The processing temperature of the twin-screw extruder is 240°C in the feeding section and 260°C in the plasticizing section The homogenization section is 270°C, the temperature of the head is 240°C, and then placed in a water tank with a temperature of 25°C, water-cooled and pelletized at a speed of 400rpm, and then vacuum-dried at 80°C for 10 hours to obtain wear-resistant nylon 66 particles .

[0027] The wear-resistant nylon 66 prepared in Example 1 has excellent mechanical properties and good wear resista...

Embodiment 2

[0030] Step (1). Weigh 1000 grams of nylon 66, 50 grams of molybdenum disulfide, 50 grams of titanium dioxide, 10 grams of antioxidant B225, and 10 grams of titanium metal powder.

[0031] Step (2). The above-mentioned raw materials were added to a high-speed mixer with a rotation speed of 800 rpm and mixed for 3 minutes to obtain a mixture.

[0032] Step (3). The above-mentioned mixture is added to a twin-screw extruder with a screw speed of 80rpm for extrusion and granulation. The processing temperature of the twin-screw extruder is 260°C in the feeding section and 280°C in the plasticizing section. The homogenization section is 300°C, the head temperature is 260°C, and then placed in a water tank with a temperature of 15°C, water-cooled and pelletized with a pelletizer at a speed of 300rpm, and then vacuum-dried at 70°C for 5 hours to obtain wear-resistant nylon 66 particles .

Embodiment 3

[0034] Step (1). Weigh 1000 grams of nylon 66, 200 grams of molybdenum disulfide, 10 grams of titanium dioxide, 1 gram of antioxidant B215, and 6 grams of titanium metal powder.

[0035] Step (2). The above-mentioned raw materials were added to a high-speed mixer with a rotation speed of 500 rpm and mixed for 5 minutes to obtain a mixture.

[0036] Step (3). Add the above-mentioned mixture to a twin-screw extruder with a screw speed of 250rpm to extrude and granulate. The processing temperature of the twin-screw extruder is 250°C in the feeding section and 270°C in the plasticizing section The homogenization section is 285°C, the head temperature is 250°C, and then placed in a water tank with a temperature of 40°C, water-cooled and pelletized at a speed of 800rpm, and then vacuum-dried at 110°C for 6 hours to obtain wear-resistant nylon 66 particles .

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Abstract

The present invention relates to a preparation method for wear resistance nylon PA66 containing a novel antioxidant, wherein 100 parts of wear resistance nylon PA66, 5-20 parts of a wear resistance agent molybdenum disulfide, 1-5 parts of a wear resistance agent titanium dioxide, 0.1-1 part of an organic antioxidant, and 0.1-1 part of a metal antioxidant titanium powder are uniformly mixed and then are subjected to melting extrusion granulation through a twin-screw extruder to prepare the wear resistance nylon PA66. The wear resistance nylon PA66 has excellent wear resistance and good mechanical property.

Description

technical field [0001] The invention relates to a preparation method of wear-resistant nylon 66, in particular to a preparation method of wear-resistant nylon 66 containing novel antioxidant. Background technique [0002] Nylon 66 is a very important engineering plastic with excellent mechanical properties, high thermodynamic deformation temperature and low friction coefficient, and is widely used in various wear-resistant devices. In order to further increase the wear resistance of nylon 66, at present, inorganic wear-resistant fillers are mainly used to reduce the friction coefficient of the material. The Chinese patent with the patent number CN102757641A provides a method for preparing high-tough wear-resistant nylon, wherein the wear-resistant agent used is one of graphite, silicon carbide or molybdenum disulfide. Molybdenum disulfide is a low-cost, high-performance wear-resistant agent that can greatly improve the wear resistance of nylon. However, molybdenum disulfid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08K13/02C08K3/08C08K3/30C08K3/22
CPCC08K3/08C08K3/22C08K3/30C08K13/02C08K2003/0881C08K2003/2241C08K2003/3009C08L77/06
Inventor 沈国璋程亚军肖颖付俊
Owner 宁波锦地工程塑料有限公司
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