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Uses of a method for the manufacture of foamed shaped polymer parts of liquid silicone rubber

A foam forming, polymer technology used in the manufacture of tools, prostheses, pacifiers, etc.

Inactive Publication Date: 2006-11-01
SULZER CHEMTECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the characteristic spectrum of LSR can only be tuned to a certain extent by raw materials

Method used

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  • Uses of a method for the manufacture of foamed shaped polymer parts of liquid silicone rubber
  • Uses of a method for the manufacture of foamed shaped polymer parts of liquid silicone rubber
  • Uses of a method for the manufacture of foamed shaped polymer parts of liquid silicone rubber

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0022] figure 1 A device 1 that can be used to carry out the method to be used is shown in a block diagram. The reservoirs 11 and 12 of the components A and B for the moulding components are connected by means of pumps 11a, 12a to the impregnation apparatuses 2a and 2b (it is also possible to have only one impregnation apparatus). Example 2 for dipping devices 2a, 2b passed figure 2 to introduce. By means of the injection moulding machine, the devices 2a, 2b and the mixing device 3, a polymer body or shaped polymer part formed in conformity with the object can be produced. In the forming tool 5, foaming occurs simultaneously with the crosslinking reaction. Both components A and B (or just one component) are impregnated with a physical foaming fluid C, which is pumped from the reservoir by pump 13a (or compressor) via line 132' and inlet pipe connector 132 13 is output into the impregnation device 2a, 2b. CO 2 , N 2 , a hydrogen compound such as pentane, or the specifie...

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PUM

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Abstract

By using a method of manufacturing foamed shaped polymer parts using liquid silicone rubber LSR as a molding component, polymer parts can be manufactured having a degree of foaming of 5% to 70% by volume, and / or The Shore A hardness is reduced by at least 10% relative to the shaped polymer part of unfoamed LSR. In this method, the molding components are present in two separate components (A, B) prior to processing. In this method, the components are impregnated with the blowing agent (C). After impregnation, the components are guided and mixed together under high pressure. Finally, under reduced pressure, the reaction mixture formed during the mixing process is injected into the cavity of the forming tool, where the molding composition foams while the crosslinking reaction takes place. The manufactured shaped polymer part can form a body that is specially designed according to its application purpose.

Description

technical field [0001] The present invention relates to the use of a method for the manufacture of foam shaped polymer parts of liquid silicone rubber. The term LSR ("Liquid Silicone Rubber") commonly used for such polymers is used hereinafter. Background technique [0002] LSR is a two-component polymer system that is not individually reactive and is commercially available with predetermined tunable properties. The LSR component is pasty. These components are combined by specialized pumping, metering and mixing techniques into molded components that can be processed on injection molding machines into shaped polymer parts. At elevated temperatures (at about 150-200°C), LSRs are crosslinked silicone rubbers, so-called "high temperature crosslinked silicone rubbers" (HTV silicone rubbers). The cross-linking reaction of the polymer can be, for example, the cross-linking of a platinum-catalyzed additive, in which a polysiloxane reacts with a cross-linking agent (comprising sh...

Claims

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Application Information

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IPC IPC(8): B29C44/04A61F2/00A61F2/12A61J11/00B25G1/10B29C70/88B29K19/00C08J9/18F16F7/00
CPCB29C44/3446C08G77/06C08J9/02B29C44/04B29C44/16
Inventor S·哈比比-奈尼
Owner SULZER CHEMTECH AG