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heat expandable foam

A thermal expansion, chemical blowing agent technology, applied in other chemical processes, vehicle subunit functions, transportation and packaging, etc., can solve problems such as skinning, reduction, and uneven foam quality

Active Publication Date: 2021-06-01
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, if the unfoamed composition is unfavorably subjected to elevated temperature or humidity prior to being inserted into the cavity to be sealed, curing of the material may be initiated prematurely, which may result in the material reduced final expansion, or may result in undesired cracking, skinning, or uneven foam quality

Method used

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Examples

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Embodiment Construction

[0057] Compositions of the present disclosure will now be described with respect to various example compositions (Examples 1-32) and comparative compositions (Examples A-L). The example compositions were substantially free of crosslinkers, while the comparative examples included a peroxide crosslinker (DC40C available from Akrochem). The amount of material for each composition in the example and comparative compositions is listed in weight percent based on the total composition before expansion. For experiments 1-20 and A-G, see Tables 1 and 2 below.

[0058] Each of the example composition and the comparative composition was prepared by weighing its material and placing the material in a container, and then continuously rotating the container for a predetermined period of time (eg, 1 to 24 hours) to satisfy Mix the materials well. The mixture of materials is then either fed into a hopper and extruded using a twin-screw extruder (such as a Buss kneader) or mixed using a smal...

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Abstract

The present invention discloses a composition for an expandable sealant comprising at least one polymeric material preferably selected from low density polyethylene (LDPE), linear low Density polyethylene (LLDPE), ethylene-vinyl acetate (EVA), ethylene-methacrylate (EMA) and ethylene-butyl acrylate (EnBA), wherein the composition is substantially free of crosslinkers.

Description

technical field [0001] The present disclosure relates to heat expandable foams. Background technique [0002] This section provides background information related to the present disclosure which is not necessarily prior art. [0003] The thermally expandable sealant and baffle composition can be formed into a desired shape such that when the sealant is inserted into a cavity, such as a hollow post structure of an automobile or other vehicle, and its thermally induced expansion is subsequently performed, its Acts as a highly effective sealant and sound barrier in that cavity. [0004] In particular, thermally expandable (expansible) sealant and fender compositions, which, after being formed into a desired configuration, are adapted to be placed in vehicle pillars or other body cavities in positions such that when the body is subjected to primer ( During e.g. electrocoating) and / or paint baking operations or other processes that increase the temperature of the environment su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/00B62D29/00C08J9/08C08J9/10C09K3/10C08L23/08
CPCB62D29/002C08J9/0061C08J9/08C08J9/104C09K3/10C08L23/08C08L23/0815C08L23/0853C08J2323/08C08J2423/08C09K3/1025C09K2003/1059B60R13/0815B60Y2306/09C08J9/105C08J2203/02C08J2203/04C08J2203/18C08J2207/00C08J2323/06C08J2331/04C08J2333/08C08J2333/10C08J2423/06C08J2431/04C08J2433/08C08J2433/10
Inventor L·沃尔舍莱戈尔J·玛彼利亚S·帕苏拉
Owner SIKA TECH AG
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