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Low viscosity noise attenuating material for automotive trim parts

A technology for noise attenuation and decorative parts, which is applied in the direction of sound-emitting devices and instruments, and can solve the problems of increasing the risk of streaking and pairing in the semi-cured area, and achieve the effect of improving durability and lightening parts

Pending Publication Date: 2020-05-01
AUTONEUM MANAGEMENT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the material is pushed during cooling, increasing the risk of streaking and binding in the prepreg area

Method used

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  • Low viscosity noise attenuating material for automotive trim parts
  • Low viscosity noise attenuating material for automotive trim parts
  • Low viscosity noise attenuating material for automotive trim parts

Examples

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Embodiment 1

[0094] A mixed noise attenuating material comprising 68% of filler, 19% of component A and 7.0% of component B formed by mixing components B1 and B2 in a ratio of 1 to 1.8 was heated ready to be injected into a mould. Add other additives as disclosed to get 100%.

[0095] The mold is formed from 2 mold halves with cavities in the form of the desired noise attenuation part or components. The mold is fully closed to start the injection. Vent points were eventually integrated to expel trapped air. Injection can be done through single or multiple injection points.

[0096] The material is injected into the mold and after a predetermined cooling time the mold is opened and the part is finally removed from the mold.

[0097] Alternatively, at least one additional layer is introduced into the mold such that the noise attenuating material can be injected directly onto the surface on predetermined areas of the additional layer or completely covered. Preferably, the additional layer...

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PUM

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Abstract

An injection moulded noise attenuating layer for an noise insulating trim part comprising a thermoplastic elastomeric material and an inorganic filler content of at least 50% by weight, preferably between 60 and 85%, based on the final material composition characterised in that the injection moulded noise attenuating layer has a melt volume index (MVI) of between 100 and 500 cm3 / 10min, preferablybetween 150 and 350 cm<3> / 10min, more preferably between 175 and 225 cm<3> / 10min measured according to current ISO 1133-1.

Description

technical field [0001] The present invention relates to a noise-attenuating material for a noise-attenuating trim part of a vehicle, the use of such a noise-attenuating material in an automotive trim part and a method of producing such a trim part. Background technique [0002] Noise-attenuating automotive trim components can be based on different principles, such as the spring-mass concept or the damping concept. Noise attenuation may be based on the use of a final filled airtight elastomeric layer to increase density, such as the mass layer formed in a mass-spring acoustic vehicle trim part such as an inner dash. [0003] Examples of such elastomeric layers can be found eg in WO 2015 / 135815, which discloses barrier layers based on ethylene polymer blends preferably containing LLDPE or LDPE with a filler content between 35% and 90%. The disclosed materials can be formed into desired thicknesses and shapes by standard methods. However, materials and current processes do no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/16
CPCC08L23/14C08L2207/02G10K11/162C08L23/16C08K2003/3045C08K2003/265C08L2207/04G10K11/168
Inventor 雅恩·伯杰拉斐尔·梅里安
Owner AUTONEUM MANAGEMENT AG
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