Heat-activatable free-radical initiators and composite material which comprises magnetic particles

A technology of composite materials and initiators, applied in the direction of silver compounds, silver compounds, iron compounds, etc., can solve the problems of uneconomical energy input, heating, affecting properties, etc.

Inactive Publication Date: 2012-05-16
EVONIK DEGUSSA GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crosslinking process is heat-dependent, with the disadvantage that the entire composition to be crosslinked must be heated, resulting in unec

Method used

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  • Heat-activatable free-radical initiators and composite material which comprises magnetic particles
  • Heat-activatable free-radical initiators and composite material which comprises magnetic particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Example 1 : One stream consists of SiCl containing 0.49kg / h 4 and 0.05kg / h of monosilane in vapor form, the second stream of the aerosol form obtained at room temperature (23° C.) by a two-fluid nozzle is composed of a 25% by weight concentration of ferrous (II) chloride in water ( Equivalent to 1.55kg / h of ferrous (II) chloride) and 5Nm 3 / h of nitrogen as spray gas, the two streams are introduced separately into the mixing zone of the reactor. This mixture is ignited in the combustion zone of the reactor by 7.9Nm 3 / h of hydrogen and 21Nm 3 / h of the air mixture produced by the flame reaction. The residence time of the reaction mixture in the combustion zone is about 40 ms.

[0092] In the cooling zone following the combustion zone, the reaction mixture was cooled to 332° C. by introducing 8 kg / h of water.

[0093] The resulting solids are separated from the gaseous substances on a filter.

Embodiment 2

[0094] Example 2 Same as Example 1, except that the proportions of silicon tetrachloride, monosilane, hydrogen and air were changed.

[0095] Table 1 gives the reaction parameters of Examples 1 and 2, and Table 2 gives the physicochemical data of the powders obtained.

[0096] Table 1: Reaction parameters

[0097]

[0098] 1) when entering the mixing zone; 2) in the combustion zone; 3) after cooling;

[0099] Table 2: Physicochemical data of powders

[0100]

[0101] 1) Magnetite, hematite ± 5%; maghemite ± 10%;

[0102] 2) The crystallite size cannot be determined due to the low proportion of maghemite.

[0103] peroxide:

[0104] Dicumyl peroxide (DCUP, CAS 80-43-3) in crystalline form, considered technically pure.

[0105] 2,5-Dimethyl-2,5-bis(tert-butylperoxy)hex-3-yne (DYBP-85-WO, CAS 1068-27-5), in desensitized form at 75 % content exists in white oil.

[0106]2,4-Dichlorobenzoyl peroxide (DCLBP-50-PSI, CAS 133-14-2), crystalline peroxide desensitized in...

Embodiment 3

[0111] Example 3 : 100 g of tert-butyl peroxybenzoate (liquid component) and 100 g of the granulate from example 1 were mixed in a paddle mixer (Beken kneader) for 20 min to obtain a dry flowable, dust-free composite.

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PUM

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Abstract

Composite material comprising - one or more heat-activatable free-radical initiators selected from the group consisting of organic peroxides and/or initiators having labile carbon-carbon bonds and particles which have a core-shell structure and the core of which comprises one or more magnetic materials, while the shell comprises silicon dioxide.

Description

technical field [0001] The present invention relates to a composite material comprising a thermally activatable free radical initiator and magnetic particles. The invention also relates to a method for the preparation of this material, and its use. Background technique [0002] The use of thermally activatable free radical initiators for crosslinking or curing of polymers is well known and routine practice. Organic peroxides are most important here. The crosslinking process is heat-dependent, which has the disadvantage that the entire composition to be crosslinked must be heated, resulting in uneconomical energy input. Furthermore, the entire composition to be crosslinked is subjected to thermal stress, which adversely affects its properties. Finally, mention should also be made of the sensitive nature of peroxides, which means that special precautions must be taken during storage and crosslinking. [0003] It is therefore one of the objects of the present invention to p...

Claims

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Application Information

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IPC IPC(8): C08F4/00C08F4/32C08J3/24
CPCC01G49/10C01P2006/42C01G49/0072C01P2004/64C01G49/08C01P2002/32C04B2235/3272C04B2235/5409C01P2004/51C01G49/06C01P2006/12C04B2235/5454C04B35/62884C01P2004/88B82Y30/00C08J3/24C09C3/12C08F4/00C08F4/32C04B35/62807C01P2004/84C01P2004/80H01F1/37C01G5/00C01G51/00C01G49/0036C04B35/62897C08K9/02C08J3/242C08K5/01C08K5/14C08K2201/01Y10S977/779C08K3/36
Inventor H·赫尔佐克K·罗克施泰因S·卡图希奇M·孔茨I·纳格尔H·沃尔夫
Owner EVONIK DEGUSSA GMBH
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