Preparation and application of open-cell foamed polyolefin

A technology for foaming polyolefin and polyolefin, which is used in the preparation of pipes and foams of various shapes, pellets, and plates, and can solve problems such as difficulty, poor adsorption performance, and application limitations.

Active Publication Date: 2009-09-16
上海高分子功能材料研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the pores of closed-cell foamed polyolefin are not connected in series, the adsorption performance is very poor, so its application is limited.
Although there is a great demand for open-cell foamed polyolefin, its open-cell foam technology has certain difficulties in foaming process and formu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The melt index of the polyethylene in embodiment 1 is 2.0g / 10min, and the nucleating agent masterbatch and polyethylene are mixed according to proportioning drop into single-screw extruder extrusion foaming, single-screw extruder aspect ratio 36, note The gas port is set between the plasticizing section and the metering section, the diameter of the gas injection nozzle is 0.2mm, the high-pressure gas is carbon dioxide, the gas injection pressure is 30MPa, and a booster pump is used to help pressurize.

[0031] Single-screw extrusion foaming process temperature °C:

[0032] Feeding section Plasticizing section metering section Neck nose 140～160 160～180 160～180 140～170 120～160

[0033] The polyethylene foam made according to the above process and formula has an adsorption rate of ≥50%, and is used to absorb a large amount of liquid flame retardant when processing flame-retardant polyethylene.

Embodiment 2

[0034] The melt index of the polyethylene in embodiment 2 is 6.0g / 10min, and the nucleating agent masterbatch and polyethylene are mixed according to proportioning drop into twin-screw extruder extrusion foaming, twin-screw extruder length-to-diameter ratio 40, note The gas port is set in the middle of the metering section, the diameter of the gas injection nozzle is 0.6mm, the high-pressure gas is nitrogen, and the gas injection pressure is 20MPa.

[0035] Twin-screw extrusion foaming process temperature °C:

[0036] Feeding section Plasticizing section metering section Neck nose 130～150 160～180 180～200 160～180 140-160

[0037] The polyethylene foam made according to the above process and formula has an adsorption rate of ≥ 50%, and is made into handicrafts of various shapes for absorbing perfume.

[0038] 2. Ethylene vinyl acetate copolymer open cell foaming

[0039] Nucleating agent masterbatch composition

[0040] Ethylene vinyl a...

Embodiment 3

[0044] The vinyl acetate content of the ethylene-vinyl acetate copolymer in Example 3 is 14%, and the nucleating agent masterbatch and ethylene-vinyl acetate copolymer resin are mixed according to the proportion and put into the single-screw extruder for extrusion foaming, and the single-screw extruder The aspect ratio is 36, the gas injection port is set between the plasticizing section and the metering section, the diameter of the gas injection nozzle is 0.3mm, the high-pressure gas is nitrogen, and the gas injection pressure is 17MPa.

[0045] Single-screw extrusion foaming process temperature °C:

[0046] Feeding section Plasticizing section metering section Neck nose 60～70 90～100 120～140 120～130 110-120

[0047] The ethylene-vinyl acetate copolymer foamed product prepared according to the above process and formula absorbs oil stains on the surface of sewage.

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Abstract

The invention relates to a preparation method of open-cell foamed polyolefin. The preparation method comprises the following steps of: mixing the polyolefin with nucleating agent master batch prepared by same olefin type polyolefin granules, a nucleating agent, a foaming-assisting anti-shrinking agent and an antioxidant, putting the obtained mixture into a single-screw or double-screw extruder with the length-diameter ratio of 20-50 for heating, plasticizing and melting, injecting high-pressure gas, fully melting, mixing and extruding out the high-pressure gas and the polyolefin, releasing, expanding, foaming when extruding the obtained mixture out of a mold at an outlet mold of the extruder so as to prepare open-cell foaming products with various shapes. The open-cell foamed products are used as adsorption substrates and adsorption carriers, and can also be used as sound-insulating, sound-absorbing, and heat-insulating materials. According to the strength and visco-elasticity of the polyolefin melt, the invention selects an appropriate position to inject the high-pressure gas, and adjusts the structure of the screw, gas pressure and gas quantity, and the heating temperature so as to lead the polyolefin to be fully foamed and cells to be opened thereon when the materials are extruded out of the outlet mold of the extruder, therefore, the gas among the cells is mutually communicated, thus having relatively high adsorption capacity, overcoming the shortage of difficult cell-opening in the existing polyolefin foaming technology and causing the polyolefin application to be more diversified and practical.

Description

technical field [0001] The invention relates to the preparation and practical application of open-cell foamed polyolefin plastics, in particular to the preparation method and application field of polyolefin open-cell foamed pellets, plates, pipes and foams of various shapes. Background technique [0002] The production technology of closed-cell polyolefin foam is relatively mature, and its application range is quite extensive. However, because the pores of closed-cell foamed polyolefin are not connected in series, the adsorption performance is very poor, so its application is limited. Although there is a great demand for open-cell foamed polyolefin, its open-cell foam technology has certain difficulties in foaming process and formula design, especially in the foaming process, to achieve a high foam body. The opening rate of the foam, screw structure, mold shape, processing temperature, injected gas volume, and gas injection pressure all have a very important influence on th...

Claims

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Application Information

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IPC IPC(8): C08J9/30C08L23/00C08L25/04C08L51/06C08K5/00C08K13/02C08J3/22B01J20/26C08K9/12C02F1/28C09K3/00B29B9/06
Inventor 穆肖斌项华丽李骥安梅龙
Owner 上海高分子功能材料研究所
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