High-rigidity PP (polypropylene) expanded beads and energy-saving preparation method thereof

Abstract

The invention discloses high-rigidity PP (polypropylene) expanded beads. A formula of the high-rigidity PP expanded beads comprises the following components in parts by weight: 42 to 95 parts of high-rigidity PP, 5 to 58 parts of low-molding-pressure PP and 0.3 to 2 parts of assistant; the high-rigidity PP is PP with a melting point of over 140 DEG C and a bending modulus of over 1.2MPa; the low-molding-pressure PP is PP with a melting point of lower than 135 DEG C. according to the high-rigidity PP expanded beads disclosed by the invention, in the production process, two extruders are adopted to carry out double-layer co-extrusion, a middle core layer is formed by the high-rigidity PP, and a skin layer is formed by the low-molding-pressure PP; on one hand, high rigidity of the high-rigidity PP of the middle core layer cannot be damaged, so that the finally prepared PP expanded beads have high rigidity; on the other hand, both the middle center layer and the skin layer adopt PP (polypropylene) materials and have good compatibility, so that incompatibility between the PP material and a PS (Poly Styrene) material or the PP material and a PE material (Poly Ethylene) cannot be generated, the formed product is difficult to strip off, and in the forming process, a required steam pressure is low and only a forming pressure of 1.4 to 2.4kPa is required.

Description

technical field [0001] The invention relates to polypropylene foam beads, in particular to a high-rigidity polypropylene foam beads and an energy-saving preparation method thereof. Background technique [0002] In the prior art, high-rigidity polypropylene foamed beads (EPP) occupy a dominant position in the market. In various polypropylene foamed beads products, the higher the rigidity of EPP, the lower the consumption of EPP, which can The products of polypropylene foamed bead products tend to be lightweight; in the invention patent of CN103509203B, the invention patent of a kind of reinforced polypropylene foamed beads discloses a method with high strength (bending strength increased by 20 %), high-impact EPP beads (impact index performance increased by 10%), this patent has improved the rigidity of polypropylene foam beads to a certain extent, but in this patent, it is only easy to crystallize and high The melting point of two polypropylene resins is simply blended. The...

AI Technical Summary

Problems solved by technology

This patent is to disperse non-crosslinked polypropylene resin particles in a dispersion medium containing organic peroxides to obtain a dispersion (water-based dispersion medium). The amount of organic peroxides in the dispersion is 100 parts by weight of polypropylene resin particles is 0.01-10 parts by weight. Due to the addition of peroxide crosslinking, on the one hand, the application of material recovery is unfavorable, and at the same time, the dispersion of peroxide in water is easy to cause pollution, and the cost of subsequent treatment will increase.

Images