Polypropylene foamed bead with different and selectively distributed cell sizes and preparation method thereof

A technology of foaming beads and polypropylene, applied in the field of polypropylene foaming beads

Pending Publication Date: 2020-12-01
WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no patent or literature introducing the technology and method that can control the orientation and selective distribution of sp

Method used

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  • Polypropylene foamed bead with different and selectively distributed cell sizes and preparation method thereof
  • Polypropylene foamed bead with different and selectively distributed cell sizes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of polypropylene microparticles with different cell sizes and selective directional distribution of large and small cells: uniformly mix 77 parts by mass of low-melt polypropylene, 20 parts by mass of calcium carbonate and polytetrafluoroethylene compound, 3 parts by mass Maleic anhydride grafted polypropylene, 0.1 parts by mass of polyethylene wax and 0.1 parts by mass of β-(3.5-di-tert-butyl-4-hydroxyphenyl) pentaerythritol propionate. Among them, the selected low melting point polypropylene melt point is 3g / min, the mass ratio of calcium carbonate and polytetrafluoroethylene in the compound nucleating agent is 95:5, the particle size of calcium carbonate is 30 microns, polytetrafluoroethylene The particle size of vinyl fluoride is 7 microns, and the graft ratio of maleic anhydride grafted polypropylene is 0.05%. Put the above resins and additives into the extruder host.

[0026] Evenly mix 99 parts by mass of high melting point polypropylene, 0.01 part b...

Embodiment 2

[0031] Except that 0.01 parts by mass of aluminum hydroxide is used as a nucleating agent in the outer polypropylene resin, the same method as in Example 1 is used to prepare polypropylene foamed resin beads with different cell sizes and selective distribution of large and small cells. and sheet metal parts.

Embodiment 3

[0033] Except that 0.1 parts by mass of aluminum hydroxide is used as a nucleating agent in the outer layer of polypropylene resin, the same method as in Example 1 is used to prepare polypropylene foamed resin beads with different cell sizes and selective distribution of large and small cells. and sheet metal parts.

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Abstract

The invention discloses a method capable of controlling specific cell sizes to be directionally and selectively distributed in a polypropylene foamed bead. According to the polypropylene foamed bead prepared by the invention, the outer layer of the bead is provided with cells having larger sizes, and the inner layer of the bead is provided with cells having smaller sizes. The sizes of the large cells are in a range of 50 microns to 200 microns, and the sizes of the small cells are in a range of 10 microns to 49 microns. A large cell area accounts for 30-50% of the total volume of the polypropylene foamed bead, and a small cell area accounts for 50-70% of the total volume of the polypropylene foamed bead. Due to anisotropy of cell size distribution, the bead has excellent mechanical property and sound insulation property.

Description

technical field [0001] The invention relates to a polypropylene foamed bead with different cell sizes and selective distribution on the cell structure, and also relates to a preparation method thereof. Background technique [0002] Due to its light weight, heat insulation, sound insulation, cushioning and other characteristics, foamed polypropylene resin has been widely used in automobiles, construction, packaging, military and other fields. The conventional method of preparing foamed polypropylene beads is to uniformly mix polypropylene with foaming agent, nucleating agent, lubricant, dispersant and other additives and disperse them in the water phase medium, and suddenly release the pressure under high temperature and high pressure. Due to the pressure difference between the inside and outside, the polypropylene expands instantly to form foam beads. When the density of expanded polypropylene beads is fixed, the cell size inside the beads can be adjusted through different ...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L27/18C08L51/06C08L23/06C08L29/04C08K13/02C08K3/26C08K3/38C08K5/20C08K5/134C08K3/22C08J9/12C08J9/16
CPCC08J9/122C08J9/0061C08J9/0066C08J9/0028C08J9/0023C08J9/0095C08J9/16C08J2323/12C08J2427/18C08J2451/06C08J2423/06C08J2429/04C08J2205/044C08J2203/06
Inventor 蒋璠晖何若虚熊业志史亚杰杨凯军刘缓缓曾佳高浩瑞朱民
Owner WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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