A preparation method of high-magnification conductive polypropylene foam 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, enhancing electrical conductivity, and reducing dosage
Active Publication Date: 2022-03-29
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 parts by weight of the basic value , but the surface resistance of the molded product (ie molded part) prepared after the secondary expansion is only 1.0×10 15 Ω, the resistivity is too large after secondary foaming, and the conductivity is poor
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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 foam beads, and in particular relates to a preparation method of high-magnification conductive polypropylene foam beads, which comprises the following steps: A. Mix polypropylene resin and conductive carbon black in a certain proportion, and obtain conductive masterbatch 1 through twin-screw extrusion; B. The polypropylene resin is mixed with the conductive filler in a certain proportion, and the conductive masterbatch II is obtained through twin-screw extrusion processing; C. Melting and blending polypropylene resin, nucleating agent, conductive masterbatch 1 and conductive masterbatch 2 to obtain polypropylene particles; D. Put the polypropylene particles prepared in step C into the foaming reactor together with the dispersion medium and the dispersing agent, then feed the foaming agent into the reactor and heat and pressurize, and when the set temperature and pressure are reached, release the pressure to obtain polypropylene Foam beads; E. The conductive polypropylene foamed beads prepared in step D are pre-pressed with air to store high-pressure air inside the beads, and then undergo secondary foaming to obtain high-magnification conductive 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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