Process for manufacturing polyolefin foaming particle material

A technology of polyolefin foaming and manufacturing method, applied in the field of polymer materials, can solve problems such as difficulty in process control, and achieve the effects of wide adjustable range, easy post-forming and excellent resilience

Inactive Publication Date: 2008-08-20
天津市润达塑料包装有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has virtually caused the difficulty of process control, which limits the application to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 97 parts by weight of low-density polyethylene and 3 parts by weight of talcum powder are fed into a diameter of 90 mm through a feed port, and the length-to-diameter ratio is 50 in the single-screw extruder, and its amount is equal to the polyolefin resin composition weight 20 The mixture of isobutane and butane of % joins in the extruder, and the position that adds gas in the extruder is 16D (D=screw diameter) from feed inlet, promptly 16 * 90mm=1440mm. The molten material composed of polymer, nucleating agent and foaming agent is fully mixed in the extruder, and then cut into foaming particles by the underwater pelletizing unit. The loose bulk density of the expanded particles is 24kg / m 3 . The foamed particles have a smooth surface, fine cells and a round shape as a whole.

Embodiment 2

[0030] The low-density polyethylene of 85 parts of weight, the ethylene thermoplastic elastomer of 14.5 parts of weight and the talcum powder of 0.5 parts of weight are fed into diameter through feeding port and are 90mm, in the single-screw extruder that length-to-diameter ratio is 50, it is The amount of isobutane equal to 15% by weight of the polyolefin resin composition is added in the extruder, and the position of adding gas in the extruder is 16D (D=screw diameter) from the feed port, that is, 16*90mm=1440mm. The molten material composed of polymer, nucleating agent and foaming agent is fully mixed in the extruder, and then cut into foaming particles by the underwater pelletizing unit. The loose bulk density of the expanded particles is 20kg / m 3 . The foamed particles have a smooth surface, fine cells and a round shape as a whole.

Embodiment 3

[0032] 50 parts by weight of atactic polypropylene, 30 parts by weight of ethylene thermoplastic elastomer, 19 parts of ethylene propylene rubber and 1 part by weight of a mixture of sodium bicarbonate and citric acid are fed to a diameter of 50mm through the feed port, and the aspect ratio In the parallel twin-screw extruder of 40, its amount is equal to the carbon dioxide of polyolefin resin composition weight 5% and joins in the extruder, and the position that adds gas in the extruder is 12D (D=screw screw) from feed inlet. diameter), that is, 12×50mm=600mm. The molten material composed of polymer, nucleating agent and foaming agent is fully mixed in the extruder, and then cut into foamed particles by a water ring (water spray) pelletizing unit. The loose bulk density of the expanded particles is 750kg / m 3 . The foamed particles have a smooth surface, fine cells and a round shape as a whole.

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Abstract

The invention relates to a producing method of polyolefin foaming pellets. The method includes putting polyolefine resin compound and foaming agent into an extruder and extrudes the mixture from the die orifice of the extruder until they are fully mixed, and then the mixture is directly cut into pellets by a cutter arranged at the die orifice. The pelletizing mode is die surface hot cutting, including underwater pelletizing, water ring (water spray) palletizing and pneumatic pelletizing. The components and parts by weight of the polyolefin foaming pellets are 50 to 97 percent by weight of polyolefin resin, 0 to 49 percent by weight of polyolefin resin modifier and 0.5 to 3 percent by weight of nucleator. The effect of the invention is that the method adopts the pelletizing mode of die surface hot cutting. By adding the polyolefin resin modifier, the temperature of extruder body is unnecessary to be strictly controlled and the cooling of the foaming pellets is effectively carried out to obtain the ideal foaming pellets. The pellets have the advantages of excellent resilience, wide adjustable range of foaming multiplying power, superior performance and simple post shaping, thus overcoming the defects of traditional extruded foaming pellets.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for manufacturing polyolefin foamed granular materials. Background technique [0002] In the prior art, there are three main manufacturing methods for preparing polyolefin foamed particles: the so-called "multi-step temperature-raising foaming method", which includes in a pressure vessel, a small amount of foaming agent is penetrated into the resin particles, and after cooling Take out the resin particles containing the blowing agent and transfer them to a foam tank, heat the foam tank to a temperature suitable for foaming, and make the resin particles foam, thereby obtaining foam particles with a low foam ratio. In the container, an inorganic gas is pressed into the air chamber of the expanded particles to obtain expandable expanded particles, and then the expandable particles are expanded by heating to obtain expanded particles with a higher expansion ratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/00C08K3/00C08K5/09C08J9/12B29B9/12B29C47/00
CPCB29B9/12B29B9/065B29B7/42B29B7/48B29B7/90B29B7/88B29B9/16B29B7/7495
Inventor 王加存崇培元万君樊高明李丽亚罗永清
Owner 天津市润达塑料包装有限公司
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