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Modified polycarbonate composite material and preparation method thereof

A polycarbonate and composite material technology, applied in the field of materials, can solve the problems of poor wear resistance of polycarbonate, and achieve the effects of good processability, improved mechanical properties, tribological properties, and balanced physical properties.

Inactive Publication Date: 2017-12-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wear resistance of polycarbonate is poor, and some polycarbonate devices used for wear-resistant applications need to modify the surface to meet the comprehensive performance and diverse needs of various fields

Method used

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  • Modified polycarbonate composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Put 7.5% nano-silicon carbide powder (particle size 25nm), 7.5% ethylene-tetrafluoroethylene powder (particle size 100um) and 85% polycarbonate powder (particle size 275um) into the high mixer and mix for 20 minutes. Mix it evenly, put it into a beaker filled with 200ml of absolute ethanol, and carry out ultrasonic dispersion for 50min. The frequency of ultrasonic vibration is 40KHZ. The mixed powder was obtained overnight in an oven; (2) placed in the main feed port of a twin-screw extruder, and extruded through a die head at a melt temperature of 285°C and a melt pressure of 2.2MPa. Silicon carbide and ethylene-tetrafluoroethylene are evenly dispersed in the polycarbonate matrix. The first extruded material is shredded and then mixed and melted for the second time to obtain the final mixed strip, which is then drawn, cooled and cut. granules, and the product is obtained after drying.

Embodiment 2

[0017] (1) Put 10% nano-silicon carbide powder (particle size 35nm), 10% ethylene-tetrafluoroethylene powder (particle size 150um) and 80% polycarbonate powder (particle size 200um) into the high mixer and mix for 25min. Mix it evenly, put it into a beaker filled with 200ml of absolute ethanol, and carry out ultrasonic dispersion for 60min. The frequency of ultrasonic vibration is 40KHZ. (2) Put it in the main feed inlet of the twin-screw extruder, and extrude it through the die head at a melt temperature of 300°C and a melt pressure of 2.4MPa. Silicon carbide and ethylene-tetrafluoroethylene are evenly dispersed in the polycarbonate matrix. The first extruded material is shredded and then mixed and melted for the second time to obtain the final mixed strip, which is then drawn, cooled and cut. granules, and the product is obtained after drying.

Embodiment 3

[0019] (1) Put 5% nano-silicon carbide powder (particle size 15nm), 5% ethylene-tetrafluoroethylene powder (particle size 50um) and 90% polycarbonate powder (particle size 350um) into the high mixer and mix for 15 minutes. Mix it evenly, put it into a beaker filled with 200ml of absolute ethanol, and carry out ultrasonic dispersion for 40min. The frequency of ultrasonic vibration is 40KHZ. The mixed powder was obtained overnight in an oven; (2) placed in the main feed port of a twin-screw extruder, and extruded through a die head at a melt temperature of 270°C and a melt pressure of 2.0MPa. Silicon carbide and ethylene-tetrafluoroethylene are evenly dispersed in the polycarbonate matrix. The first extruded material is shredded and then mixed and melted for the second time to obtain the final mixed strip, which is then drawn, cooled and cut. granules, and the product is obtained after drying.

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Abstract

The invention belongs to the field of a material, and discloses a preparation method of a modified polycarbonate composite material. According to the method, a product is obtained by performing solvent dispersion, ultrasonic vibration, traction, cooling and palletization shaping on nanometer silicon carbide powder, ethylene-tetrafluoroethylene and polycarbonate powder, wherein the frequency is 40KHZ during the ultrasonic vibration; the granularity of the polycarbonate is 200 mum to 350 mum; the density is 1.2g / cm<3>; the granularity of the nanometer silicon carbide is 15nm to 35nm; the density is 3.2g / cm<3>; the granularity of the ethylene-tetrafluoroethylene is 5mum to 15 mum; the density is 2.5g / cm<3>. The material has the advantages that the crystallinity degree is improved in the ultrasonic vibration; the crystal grains are refined, so that the wear-resistant performance of the material is greatly improved; the material can be used under the condition of achieving the better wear resistance performance than the original polycarbonate.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a polycarbonate composite material modified by nano-silicon carbide and ethylene-tetrafluoroethylene copolymer and a preparation method thereof. Background technique [0002] Polycarbonate is a kind of tough thermoplastic resin, which is a polymer with carbonate groups in its molecular chain. Polycarbonate is colorless and transparent, heat-resistant, impact-resistant, flame-retardant BI grade, and has good mechanical properties at normal operating temperatures. Compared with polymethyl methacrylate whose performance is close to that of polymethyl methacrylate, polycarbonate has good impact resistance, high refractive index, good processability, and has UL94 V-0 flame retardancy without additives. However, polycarbonate has poor wear resistance, and some polycarbonate devices used for wear-resistant applications need to modify the surface to meet the comprehensive performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L81/02C08L23/08C08K3/34
CPCC08L69/00C08K2201/003C08K2201/011C08L2201/08C08L2205/03C08L81/02C08L23/0892C08K3/34
Inventor 任旭东石佑敏罗春晖陆聪王杰李祥马服辉
Owner JIANGSU UNIV