Expandable polypropylene beading, preparation method thereof, and its foaming beading and foaming molding products

Abstract

The invention provides an expandable polypropylene bead and a preparation method of the expandable polypropylene beads, and also provides foaming beads and foaming molding products of the expandable polypropylene beads, which relates to the resin expandable beads technical field. Random copolymerized polypropylene is used as basic resin, so that melting intensity can reach to an ideal range when in foaming with high melting intensity polypropylene and low density polyethylene resin being added. Expandable beads are prepared in a closed reactor without external pressure with pentane being used as foaming agent. The expandable beads contain 1 to 15 parts by weight of the high melting intensity polypropylene, 1 to 10 parts by weight of the low density polyethylene, 1.0 to 3.8 parts by weight of the foaming agent and 0.1 to 10 parts by weight of nucleating agent on the basis of 100 parts by weight of the random copolymerized polypropylene. The expandable polypropylene beads are easy to foam, whose foaming rate can reach to 16 times with uniform cells and whose foam volume weight is about 0.05 to 0.12g / cm3. The invention adopts a low-pressure method to produce the polypropylene foaming products in different shapes according to the requirement with low equipment requirement and low cost.

Description

technical field [0001] The present invention relates to resin expandable beads, and more particularly, to expandable polypropylene beads and a process for their preparation, as well as expanded beads and expanded molded articles prepared therefrom. Background technique [0002] The preparation of foams from expandable beads is an important field of application of plastic materials. It has outstanding advantages such as simple molding method, controllable shape of foam products, and easy size change, so it is widely used. [0003] However, expandable polystyrene beads and expandable polyethylene beads, which are currently used in large quantities, have the following disadvantages: low heat resistance temperature, low modulus, low energy absorption when impacted, and easy deformation. [0004] Polypropylene foam material has good high temperature resistance, high strength, large energy absorption and small deformation when impacted, so it has wider uses and application prospe...

AI Technical Summary

Problems solved by technology

[0003] However, expandable polystyrene beads and expandable polyethylene beads, which are currently used in large quantities, have the following disadvantages: low heat resistance temperature, low modulus, low energy absorption when impacted, and easy deformation, etc.

The foaming ratio is small, and the production cost of the product is high