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A method for the manufacture of a foamed polymer body

A polymer and fluid technology, applied in the field of preparing foamed polymers, can solve the problem of not being able to cross-link and foam at the same time, and achieve the effects of eliminating the flushing process, small maintenance and high operational safety.

Inactive Publication Date: 2011-08-17
SULZER CHEMTECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the decomposition of the blowing agent used in rubber foaming, the above method cannot be used because the crosslinking reaction proceeds too quickly at the temperature level required to form the foaming gas to simultaneously crosslink and foam. Foaming of LSR

Method used

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  • A method for the manufacture of a foamed polymer body
  • A method for the manufacture of a foamed polymer body

Examples

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Embodiment Construction

[0018] Apparatus 1 that can implement the method according to the invention, such as figure 1 shown in the block diagram. Storage tanks 11 and 12 for molding composition components A and B are connected to impregnation devices 2a and 2b, respectively, via pumps 11a, 11b. (It is also possible to arrange only one impregnation device). Embodiment 2 for the impregnation apparatus 2 a , 2 b is described with reference to FIGS. 2 and 3 . Polymers or polymer moldings foamed according to the invention can be produced by means of an injection molding machine, devices 2 a , 2 b and mixing device 3 . Foaming and crosslinking reactions proceed simultaneously in the molding tool 5 . Variations of the method using extrusion tools are also possible.

[0019] Before processing the molding composition, the molding composition is present in the form of two separately held components A and B. They all include partial reagents for carrying out the crosslinking reaction; they differ due to th...

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Abstract

The method for the manufacture of a foamed polymer body from a mold composition is carried out using a shaping tool in which a cross-linking reaction and a formation of foam bubbles takes place simultaneously. Before a processing of the mold composition, the two separately held components (A, B) from which the composition is made each includes partial means for the carrying out of the cross-linking reaction and which differ by these partial means. The two components (A, B) are transported separately in two flows under elevated pressure at the start of the preparation. In this process, both components, or only one of the components, are impregnated with a foaming agent (C). The two flows are then combined under still elevated pressure and are mixed in this process. Finally, the reactive mixture formed by mixing is continuously extruded while lowering the pressure or is injected in a metered manner into a cavity of the shaping tool. The cavity is optionally heated for the acceleration of the cross-linking reaction.

Description

technical field [0001] The invention relates to a method for preparing foamed polymers and to a device for carrying out the method. The production of the foamed polymer can be carried out meteredly by injection molding or continuously by extrusion. Background technique [0002] An injection molding process and a corresponding apparatus are described in DE-A-198 53 021 with which foamed polymer moldings can be produced. An apparatus will be disclosed which comprises a conventional injection molding machine and with which physical blowing agents (such as nitrogen, carbon dioxide, water) can be added to the polymer melt using a gas metering system. According to the described embodiment of impregnating the polymer with the blowing agent by diffusion, the blowing agent is brought into contact with the molten stream at the surface of the stream in the annular gap. The annular gap is formed by two hollow cylinders made of sintered metal and enables a uniform inrush of blowing age...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/18C08J3/24C08L83/00B29C67/20B29C44/34B29C44/42C08J9/04C08L83/04
CPCB29C44/3446C08L83/04C08J9/04C08J9/12C08L75/04C08J2383/04C08J2375/04
Inventor H·维尔J·施图德勒克S·哈比比-奈尼
Owner SULZER CHEMTECH AG
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