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Rotational moulding foaming polyethylene composite and polyethylene foaming product

A technology of foaming polyethylene and polyethylene foaming, applied in the direction of coating, etc., can solve the problems of resin strength and temperature resistance decline, cell coarsening, etc., and achieve excellent processing performance, small cell structure, and processing performance easy effect

Active Publication Date: 2017-04-05
NAT INST OF CLEAN AND LOW CARBON ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding EVA in this method improves the fluidity of the resin, but the strength and temperature resistance of the resin decrease. If the rotational molding time is too long or the temperature is too high, the cells will be obviously coarsened.

Method used

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  • Rotational moulding foaming polyethylene composite and polyethylene foaming product
  • Rotational moulding foaming polyethylene composite and polyethylene foaming product
  • Rotational moulding foaming polyethylene composite and polyethylene foaming product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This example is used to illustrate the foamed polyethylene composition for rotomolding and the polyethylene foamed product provided by the present invention.

[0047] (1) Mixing: According to the material composition listed in Table 1, the density, crystallization enthalpy and melt index of the polyethylene blend were measured, and the results are shown in Table 2. Add various materials into the mixer and stir until they are evenly mixed;

[0048] (2) Pelletization: The mixture was added into a twin-screw extruder (Model RheoDrive16 from Thermo Fisher Company) for extrusion and granulation. The extrusion temperature and screw speed are shown in Table 1. Drying the granulated product at 60° C. for 3 hours to obtain pellets, which is a foamed polyethylene composition for rotational molding;

[0049] (3) Grinding and sieving: After the pellets are ground, sieve out powders with a particle size smaller than 35 meshes, which are used as rotomolding foaming raw materials;

...

Embodiment 2-3

[0055] This example is used to illustrate the foamed polyethylene composition for rotomolding and the polyethylene foamed product provided by the present invention.

[0056] According to the method of Example 1, the density, crystallization enthalpy and melt index of the polyethylene blend listed in Table 1 were measured, see Table 2.

[0057] According to the material composition and conditions listed in Table 1, a foamed polyethylene composition for rotational molding and a polyethylene foamed product were obtained.

[0058] The pressure density of the obtained polyethylene foamed product was measured, the expansion ratio was calculated, and the inner surface of the product was observed. The results are shown in Table 2.

[0059] The obtained polyethylene foam product was cut open and the cell section and cell quality were observed with a microscope, and the average cell diameter and cell diameter distribution were measured and calculated. The results are shown in Table 2. ...

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Abstract

The invention discloses a rotational moulding foaming polyethylene composite and a polyethylene foaming product. The rotational moulding foaming polyethylene composite comprises, by weight, 100 parts of polyethylene blends, 1-5 parts of foaming agents, 0.1-1 part of antioxidants, 0.1-1 part of lubricating agents and 0.1-1 part of nucleating agents, wherein the crystallization enthalpy of the polyethylene blends is 120 J / g or below, the density of the polyethylene blends is 0.93-0.96 g / cm<3>, and the melt index of the polyethylene blends is 3-7 g / 10 min. With total weight of the polyethylene blends as the benchmark, the polyethylene blends comprise, by weight, 80%-95% of high-density polyethylene A and 5%-20% of low-density polyethylene B. The obtained polyethylene foaming product can have better foam structure and high strength.

Description

technical field [0001] The invention relates to a foamed polyethylene composition for rotational molding and a polyethylene foamed product. Background technique [0002] Rotationally molded foamed products have the characteristics of light specific gravity, sound insulation, and heat insulation, and the market demand is growing rapidly. However, the rotational molding process for preparing the foamed product is relatively special, which belongs to pressureless foaming, and requires the foamed resin to have good fluidity and melt strength. However, resins with high melt strength will have poor processing fluidity, so the choice of foaming resin and modification method is very important for successful rotational molding foaming. For this reason, cross-linking methods are often used in the market, but the cross-linking process is difficult to control, and premature cross-linking is more likely to occur, and excessive cross-linking results in a decrease in foaming ratio. There...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K13/02C08K5/098C08K3/34C08K5/134C08K5/526C08J9/10B29B9/06B29C47/92B29C41/52B29C48/92
CPCB29C41/52B29C48/92B29C2948/9258B29C2948/92704C08J9/105C08J2203/04C08J2205/04C08J2323/06C08J2423/06C08L23/06C08L2203/14C08L2205/025C08L2205/24C08L2207/062C08L2207/066C08K13/02C08K5/098C08K3/34C08K5/1345C08K5/526
Inventor 孙苗苗陈学连梁文斌赖世耀孙小杰
Owner NAT INST OF CLEAN AND LOW CARBON ENERGY
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