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

A technology for foaming polyethylene and polyethylene, which is applied in the field of preparation of polyethylene foam beads, can solve the problem of surface unevenness, affect the melt strength of pre-expanded particles, and deteriorate the surface flatness of EPE molding parts. Deformation resistance and other issues, to achieve high temperature resistance, shorten the molding time, and ensure smooth penetration.

Active Publication Date: 2019-04-19
WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment

[0025] Examples A-F were made according to the formula in the table below, and the first-time EPE beads were directly sampled for sheet forming test. Place the molded board (46cm×35cm×6cm) in a drying room at 70°C for 5 hours, then cool it naturally for 3 hours, and compare the surface conditions of the board. it is good.

[0026]

[0027]

[0028]It can be seen from the above table that the selection of PE raw materials is particularly important. Changes in the content of acid absorbing agents and fluctuations in the Vicat softening point of low-density polyethylene have a greater impact on the final molding pressure of EPE beads and the surface condition of molded parts. . At the same time, the synergistic effect of zinc borate, talcum powder, and silicon dioxide, the three inorganic foaming aids, and the amount of color masterbatch and compound flame retardant have a synergistic effect to a certain extent. The primary product prepared by the same foaming procedure T...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L23/06C08K13/04C08K3/34C08K3/38C08K7/26C08K5/098C08J9/24
CPCC08J9/0023C08J9/0061C08J9/0066C08J9/0095C08J9/24C08J2323/08C08J2423/06
Inventor 叶明何若虚曾佳刘缓缓黄二波史加新杨亮炯路骐豪贾志文吴艳
Owner WUXI HI TEC ENVIRONMENTAL MATERIAL CO LTD
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