Preparation method of high-multiplying-power electroconductive polypropylene foamed beads
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A technology of foamed beads and polypropylene, which is applied in the field of polypropylene foamed beads, can solve problems such as poor electrical conductivity and high resistivity, and achieve the effects of avoiding agglomeration, low density, and reducing impact
Active Publication Date: 2019-07-26
WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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Chinese patent document CN104053713A discloses a polypropylene-based resin foamed particle, its preparation method, and a molded product of polypropylene-based foamed particle, the addition of conductive carbon black is 6-14 parts per 100 part
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preparation example Construction
[0040] The preparation method of high-magnification conductive polypropylene foam beads comprises the following steps:
[0041] A. After mixing the polypropylene resin and conductive carbon black uniformly in a certain proportion, the conductive masterbatch 1 is obtained through twin-screw extrusion processing;
[0042] B. After mixing the polypropylene resin and the conductive filler uniformly in a certain proportion, the conductive masterbatch II is obtained through twin-screw extrusion processing;
[0043] C. melt blending polypropylene resin, stabilizer, nucleating agent, conductive masterbatch 1 and conductive masterbatch 2 to obtain polypropylene particles;
[0044] D. Put the polypropylene particles prepared in step C into the foaming reactor together with the dispersion medium and the dispersing agent, then continuously feed the foaming agent into the foaming reactor and heat and pressurize until the set temperature and pressure are reached , rapid pressure release to...
Embodiment 12
[0058] Example 12 is basically the same as Example 10, except that, after the rapid pressure release in step D, the obtained polypropylene foam beads are kept at 70°C for 30 minutes;
Embodiment 13
[0059] Example 13 is basically the same as Example 10, except that, after the rapid pressure release in step D, the obtained polypropylene foam beads are kept at 80°C for 20 minutes;
[0060] After rapid pressure release in Step D in Examples 12 and 13, the obtained polypropylene foam beads were kept at 70-80° C. for 20-30 minutes. The specific operation method is: put the foamed beads just out of the foaming reactor into a spiral insulation pipe, keep the temperature at 70-80°C, the length of the spiral insulation pipe is 30-50m, and the beads are in the During the circulation transmission process, the pipeline is always kept at a constant temperature, and the beads enter the storage bag after circulating in the pipeline for 20-30 minutes.
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Abstract
The invention belongs to the technical field of polypropylene foamed beads, and particularly relates to a preparation method of high-multiplying-power electroconductive polypropylene foamed beads. Thepreparation method includes following steps: A, mixing polypropylene resin and electrocconductive carbon black according to a certain proportion, and processing through double-screw extrusion to obtain first electroconductive masterbatch; B, mixing polypropylene resin with electroconductive filler according to a certain proportion, and processing through double-screw extrusion to obtain second electroconductive masterbatch; C, melt-blending polypropylene resin, a nucleating agent, the first electroconductive masterbatch and the second electroconductive masterbatch to obtain polypropylene particles; D, putting the polypropylene particles obtained in the step C, a dispersion medium and a dispersant together into a foaming reaction kettle, feeding a foamer into the reaction kettle, heating,pressurizing, and depressurizing polypropylene foamed beads when reaching set temperature and pressure; E, performing air pre-pressing on the electroconductive polypropylene foamed beads obtained in the step D to enable high-pressure air to be stored inside the beads, and performing secondary foaming to obtain the high-multiplying-power electroconductive polypropylene foamed beads.
Description
technical field [0001] The invention belongs to the technical field of polypropylene foam beads, and in particular relates to a preparation method of high-magnification conductive polypropylene foam beads. Background technique [0002] With the continuous expansion of the application field of foamed polypropylene, the market puts forward increasingly stringent requirements for functionalized foamed polypropylene. For example, in order to prevent electronic components from being damaged due to static electricity generated by friction or impact during packaging and transportation, anti-static foamed polypropylene came into being. On the one hand, due to the excellent cushioning and energy absorption properties of foamed polypropylene, it can effectively protect parts from collision damage; on the other hand, antistatic foamed polypropylene parts can effectively transfer electronic components due to friction during transportation. The static electricity gathered by the collisi...
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