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Co-catalysts with improved shelf life

A co-catalyst, shelf-life technology, applied in the field of co-catalyst, can solve problems such as harmful

Inactive Publication Date: 2009-07-08
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this improves their stability, such water contents are detrimental when they are used as cocatalysts for thermal crosslinking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The preparation of procatalyst of the present invention:

[0014] 33.4 g of highly dispersed silica (HDK N20) were charged into a glass beaker. Then 66.6 g of diethylacetoacetamide (DEAA) or dimethylacetoacetamide (DMAA) were added in a small nozzle under stirring using a paddle stirrer. To complete the homopolymerization, continue stirring at maximum speed for 1 minute after the addition is complete. The resulting product was then used for later use.

[0015] Determination of shelf life:

[0016] Weigh 10 g of the above-prepared mixtures (DEAA-HDK and DMAA-HDK) respectively, place them in a glass Petri dish (diameter 80 mm), and cover them to avoid light.

[0017] For comparison, 20 g of DEAA and DMAA were weighed and placed in a glass Petri dish (80 mm in diameter), and covered with a lid to avoid light.

[0018] For further comparison, a mixture of 14 g of DEAA or DMAA and 6 g of water was weighed and placed in a glass Petri dish (80 mm in diameter) and covered w...

Embodiment 4

[0045] 0.15 g of DEAA-HDK was added to the above mixture, which was stored at 60° C. for 8 weeks.

Embodiment 7

[0051] 0.15 g of DEAA-HDK was added to the above mixture, which was stored at 60° C. for 8 weeks.

[0052] After expiration of the shelf life, the mixtures according to the invention and the mixtures of the comparative examples were applied to glass plates and the time at which they started to gel was determined (gel time GT in minutes). An increase in gel time indicates a decrease in activity. The results are shown in Table 4.

[0053] Table 4

[0054] Example

[0055] The results of Example 4 (compared to Comparative Example 5) and Example 7 (compared to Comparative Example 6) show that the activity of the co-catalyst is not significantly reduced when it is applied to the support material.

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PUM

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Abstract

The invention relates to co-catalysts with improved shelf life, from the group of dialkylacetoacetamides, dialkylanilines and acetylacetonates for the thermal cross-linking of polymers, characterised in that the co-catalysts are applied to a powdered inorganic support material.

Description

technical field [0001] The present invention relates to cocatalysts with extended shelf life for thermal crosslinking of polymers. Background technique [0002] Thermal crosslinking or curing of polymers is accelerated by the addition of catalysts. For example, in the production of two-dimensional parts made of plastic, unsaturated polyester resin compositions (UP resins) are often used. These polyester resins are all reaction products of dicarboxylic acids or dicarboxylic anhydrides with polyols. Such polyester resin compositions also include monomers containing ethylenically unsaturated groups, typically styrene. Styrene is added to the polyester resin composition to dissolve the polyester and ensure that the polyester composition is fluid. In order to reinforce the plastic parts obtained from the polyester resin composition, the polyester resin composition also contains fiber materials such as glass fibers, carbon fibers or corresponding fiber mats. For curing, such s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/00C08K3/34C08K9/12C08L67/06
CPCC08L67/06C08K5/20C08F299/00C08F299/04C08L2666/66C08K5/00C08K9/12C08K3/34
Inventor R·格雷韦M·特里弗林格尔M·德赖尔A·卢茨P·卡赫尔曼L·米斯兹克
Owner WACKER CHEM GMBH