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Silicon dioxide reinforced PA66 and preparation thereof

A silicon dioxide and PA66 technology, applied in the field of silicon dioxide reinforced PA66 and its preparation, can solve the problems of difficult processing of large plastic parts, loss of nanometer effect, large specific surface area, etc., achieving good rigidity and toughness, and high addition amount. , Beautiful appearance and smooth effect

Inactive Publication Date: 2008-11-05
NANJING HONGRUI PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are domestic research reports on the use of nano-scale silica to enhance PA66 (Chinese patent 200610025763.7). However, due to the small size and large specific surface area of ​​nano-silica, the amount of various materials added does not exceed 5%, otherwise it cannot be added. , the second is the loss of nano-action, it is impossible to ensure good fluidity while improving the strength, rigidity and toughness of the material, it is difficult to process large plastic parts, and it is necessary to replace traditional metal materials such as auto parts and mechanical parts. The field of high strength, rigidity, toughness and fluidity still cannot meet the requirements

Method used

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  • Silicon dioxide reinforced PA66 and preparation thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get 15 parts by weight of PA66 slices, 15 parts by weight of silicon dioxide, 0.1 part by weight of aminopropyltriethoxysilane, 0.2 parts by weight of antioxidant 1010 and 0.2 parts by weight of antioxidant 168, 0.15 parts by weight of calcium stearate, Add it into a high-speed mixer, stir and disperse evenly, discharge the material, put it in a twin-screw extruder to melt, blend, extrude and granulate to obtain a high-filling base material. The process conditions of the extruder are: the temperature of the 1-2 zone of the twin-screw extruder is 260°C, the temperature of the 3-4 zone is 270°C, the temperature of the 5-6 zone is 265°C, and the temperature of the 7-8 zone is 260°C. The temperature is 250° C., and the screw speed is 300 rpm.

[0027] Take the high-filling base material obtained in the first step, graft EPDM with maleic anhydride, add the remaining PA66 slices and calcium stearate into a high-speed mixer, stir and disperse evenly, discharge the mater...

Embodiment 2

[0030] Get 11 parts by weight of PA66 slices, 14 parts by weight of silicon dioxide, 0.1 parts by weight of isopropyl tris (dioctyl pyrophosphate acyloxy) titanate, 0.1 parts by weight of antioxidant 1010 and 0.1 parts by weight of antioxidant 168 , N, N'-ethylenebisstearamide 0.14 parts by weight, add in the high-speed mixer and stir to disperse evenly, discharge, put it in the twin-screw extruder for melt blending extrusion granulation, obtain high filling Binder. The process conditions of the extruder are: the temperature of the 1-2 zone of the twin-screw extruder is 270°C, the temperature of the 3-4 zone is 280°C, the temperature of the 5-6 zone is 260°C, and the temperature of the 7-8 zone is 250°C. The temperature is 250° C., and the screw speed is 350 rpm.

[0031] Take the high-filling base material obtained in the first step and maleic anhydride grafted LLDPE, the remaining PA66 slices and N, N'-ethylenebisstearamide and add them to a high-speed mixer to stir ...

Embodiment 3

[0034] Get 25 parts by weight of PA66 chips, 17 parts by weight of silicon dioxide, 0.1 part by weight of aminopropyltriethoxysilane, 0.2 parts by weight of antioxidant 1010 and 0.2 parts by weight of antioxidant 168, N, N'-ethylene Add 0.22 parts by weight of bis-stearamide into a high-speed mixer, stir and disperse evenly, discharge, and place it in a twin-screw extruder to melt, blend, extrude and granulate to obtain a high-filling base material. The process conditions of the extruder are: the temperature of the 1-2 zone of the twin-screw extruder is 260°C, the temperature of the 3-4 zone is 280°C, the temperature of the 5-6 zone is 270°C, and the temperature of the 7-8 zone is 260°C. The temperature is 245° C., and the screw speed is 330 rpm.

[0035] Take the high-filling base material obtained in the first step, maleic anhydride grafted POE, the remaining PA66 slices and N, N'-ethylenebisstearamide, add them to a high-speed mixer, stir and disperse evenly, and dis...

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Abstract

The invention relates to a silica reinforced PA66 and a preparation method thereof, the raw materials of which include following materials by weight: 70-80 portions of PA66, 13-17 portions of silica, 4-15 portions of elastomer, 0.1-0.3 portion of coupling agent, 0.2-0.5 portion of antioxidant, and 0.5-1 portion of lubricant. The preparation method is as follows: (1) prepare high filling base material by extruding pelletizing after the silica, the coupling agent, the antioxidant, the lubricant and the PA66 are uniformly mixed, wherein, the weight ratio of the PA66 to the silica is from 45: 55 to 60: 40, with the amount of the lubricant being 0.5 to 1 percent of the gross weight of the PA66 and the silica; (2) carry out the extruding pelletizing after the high filling base material is uniformly mixed with the elastomer, the residual PA66 and the lubricant. By well combining rigidity, flexibility and fluidity, the invention can be used for machining large-sized plastic pieces, and further enlarging the application scope of the PA66.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to silica-reinforced PA66 and a preparation method thereof. Background technique [0002] As the largest engineering plastic, nylon has excellent properties such as high strength, oil resistance, corrosion resistance, and self-lubrication. Commonly used mineral filling modification to improve the strength of nylon and reduce material cost. Mineral-filled reinforced nylon has been widely used by domestic engineering plastics manufacturers, but its disadvantages are that the surface of the product is hard to cover up, the injection molded parts are easy to warp, and the flexural modulus is low. Its products show the characteristics of no rigidity and reduced fluidity. Compared with commonly used minerals, silica has excellent wear resistance, weather resistance, rigidity and hardness. Therefore, choosing silica to strengthen nylon can greatly improve the strength, toughnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08K9/06C08K13/06C08J3/20
Inventor 张明张静志李志嘉
Owner NANJING HONGRUI PLASTIC PROD
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