Foamed polypropylene bead with low melting point and high cementability and preparation method thereof

Abstract

The invention discloses a foamed polypropylene bead with a low melting point and high cementability and a preparation method thereof. The preparation method comprises the following steps: preparing polypropylene with a low melting point, high cementability and high melt strength with high-melt-strength polypropylene as a matrix resin and a petroleum resin and an ethylene-acrylic acid copolymer as tackifying and cooling agents; adding a foaming agent and a nucleating agent and then carrying out extrusion so as to obtain a one-shot foamed polypropylene bead; and then carrying out kettle pressure foaming so as to obtain the foamed polypropylene bead. The foamed polypropylene bead prepared in the invention has a low melting point and good foaming performance, and the density of a foaming body during foaming of the bead is 0.2 g/cm3. According to the invention, a low pressure process is employed, requirements on equipment are low, investment is small, no isolating agent or surfactant is used, no waste water is discharged, the whole production process is green and pollution-free, so the preparation method has good industrial application prospects.

Description

technical field [0001] The invention relates to the technical field of polymer materials, more specifically, the invention relates to a low-melting-point high-adhesive foamed polypropylene bead and a preparation method thereof. Background technique [0002] Polypropylene resin (PP) has the characteristics of light weight, abundant raw material sources, superior performance-price ratio, excellent heat resistance, chemical corrosion resistance, and easy recycling. It is a general-purpose thermoplastic resin with the fastest production growth in the world. At present, my country's PP resin has become the resin variety with the largest output. However, the main applications are woven products and agricultural films. The PP resin industry is facing the problems of single consumption structure, weak demand and low-grade products. In recent years, various resin manufacturers are actively adjusting their production ideas, developing and producing marketable, high-quality, high-v...

AI Technical Summary

Problems solved by technology

From the perspective of preparation technology, the existing technology usually adopts high-pressure method, and the production technology is complicated, the equipment investment is large, and the cost is high. For details, please refer to the patents with the announcement number US 6956067 B2 and the announcement number US 6797734

In addition, the patent "Manufacturing Method of Polypropylene Resin Expanded Particles" with the notification number CN 1228365C heats the polypropylene resin particles impregnated with the physical foaming agent from the airtight container under low pressure The area is released to make it foam to obtain foamed particles. This method uses a large amount of inorganic release agent and produces a large amount of waste water; Japan JSP company patents ZL01819174.6, ZL02826640.4, ZL 200410061513.X, ZL 200410063190.8 describe a kind of utilization kettle The method of producing polypropylene foam beads by the formula method will leave peroxides and their decomposition products in the foamed products. These release agents, peroxides and their decomposition products not only have serious negative impacts on the environment, but also It affects the service life of the product, so there is no good application prospect