Easily melted foamed polyethylene bead with strong temperature tolerance and preparation method thereof

Abstract

The invention discloses an easily melted foamed polyethylene bead with strong temperature tolerance and a preparation method thereof. Low density polyethylene with a Vicat softening point of 90 to 105DEG C and high density polyethylene are compounded, at the same time, an inorganic compounding foaming aid is adopted, and through the synergistic effect generated by three components, goals of easily melting and high temperature tolerance are realized. Through the cooperation of formula and technology, the size of inner pores of primarily foamed EPE beads is controlled in a range of 200 to 230 [mu]m, after foaming, no thermal insulation device is needed, and a step of introducing steam with a certain air pressure into a pipe for delivering polypropylene resin particles is not needed either.The moulding steam pressure is obviously reduced, the melting stability between particles is excellent, and the curing degree is 95% or more. Because the inner pores in the beads are increased, and the pore uniformity is increased, the polyethylene bead can tolerate a certain moulding temperature, the stiffness of pores in the surface of a moulded product is improved, and the beauty of the surfaceof a EPE bead moulded product is obviously improved.

Description

technical field [0001] The invention relates to the technical field of preparation of polyethylene foam beads, in particular to a foamed polyethylene bead with easy fusion and high temperature resistance and a preparation method thereof. Background technique [0002] Expanded polyethylene (EPE) products are widely used in packaging, mattresses, sports and fitness materials due to their light weight, heat preservation, shockproof, moisture-proof, friction-proof, good plasticity, corrosion resistance, resilience, and cushioning resistance. field. [0003] International Publication No. 97 / 18260 describes non-crosslinked polyethylene-based resin pre-expanded particles formed by a mixed resin of high-pressure low-density polyethylene, linear low-density polyethylene, and linear high-density polyethylene, but It does not provide an effective method for improving the fullness of the surface of the bead molding product and improving the surface smoothness of the product, and the mo...

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Problems solved by technology

If the molding steam pressure is increased to ensure full fusion between the beads, then the surface of the product will appear uneven defects

In addition, polyethylene will add a large amount of acid absorbing agent during the synthesis process (acid absorbing agents are generally calcium stearate, zinc stearate, etc.), although the acid absorbing agent can absorb chloride ions that may appear during the synthesis process Halogen elements, but remaining in polyethylene raw materials will directly affect the melt strength of pre-expanded particles, and will deteriorate the surface flatness of EPE molded parts and the deformation resistance of EPE parts

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