Preparation method of sound-absorbing cotton for automobile muffler

A technology of automobile mufflers and sound-absorbing cotton, which is applied in the field of automobile manufacturing, can solve problems such as poor environmental protection, short service life, and poor water absorption, and achieve good strength, wide sound-absorbing frequency range, and excellent sound-absorbing performance

Inactive Publication Date: 2019-03-08
徐州瑞田工程机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The sound-absorbing cotton in the prior art is usually an artificial inorganic fiber sound-absorbing cotton made of polyester fiber, rock wool, mineral wool, etc., which not only has disadvantages such as poor environmental protection, pathogenicity and carcinogenicity, poor water absorption, and short service life. , and the sound absorption and noise reduction function is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] The preparation method comprises the following steps:

[0019] Step 1: Add epoxy resin, flame retardant polyether polyol and 2,2'-iminobiethanol into the mixer and mix evenly to obtain the mixed material. During the mixing process, keep the mixed material at a constant temperature of 20-25°C and control the mixer The speed is 280~300r / min;

[0020] Step 2, first preheat methyltrimethylene glycol, isobutyl vinyl ether and vulcanization accelerator to 20-25°C, and then preheat the preheated methyltrimethylene glycol, isobutyl vinyl ether Ether and vulcanization accelerator are sequentially added to the mixed material and stirred for 4-10 minutes to obtain the final mixed material;

[0021] Step 3: Pour the final mixture into a sound-absorbing cotton mold preheated to 50-55° C., and demould after 5-10 minutes to obtain a sound-absorbing cotton product.

Embodiment 1

[0022] Example 1: The preparation method of the sound-absorbing cotton for the automobile muffler consists of epoxy resin, flame-retardant polyether polyol, 2,2'-imino bis-ethanol, methyl trimethylene glycol, isobutyl vinyl Ether and dithiocarbamate vulcanization accelerators, of which epoxy resin accounts for 40%, flame-retardant polyether polyol accounts for 50%, 2,2'-imino bis-ethanol accounts for 3%, methyl triethylene Methyl glycol accounts for 5%, isobutyl vinyl ether accounts for 1%, and dithiocarbamate vulcanization accelerator accounts for 1%.

Embodiment 2

[0023] Example 2: The preparation method of the sound-absorbing cotton for the automobile muffler consists of epoxy resin, flame-retardant polyether polyol, 2,2'-imino bis-ethanol, methyl trimethylene glycol, isobutyl vinyl Ether and dithiocarbamate vulcanization accelerators, of which epoxy resin accounts for 45%, flame-retardant polyether polyol accounts for 47%, 2,2'-imino bis-ethanol accounts for 2%, methyl triethylene Methyl glycol accounts for 2%, isobutyl vinyl ether accounts for 2%, and dithiocarbamate vulcanization accelerator accounts for 2%.

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PUM

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Abstract

The invention discloses a preparation method of sound-absorbing cotton for an automobile muffler. The sound-absorbing cotton is prepared by epoxy resin, flame-retardant-type polyether polyol, 2,2'-iminodiethanol, methyl trimethyl glycol, isobutyl vinyl ether and a vulcanizing accelerator, wherein the epoxy resin accounts for 37-45%, the flame-retardant-type polyether polyol accounts for 45-50%, the 2,2'-iminodiethanol accounts for 2-3%, the methyl trimethyl glycol accounts for 2-8%, the isobutyl vinyl ether accounts for 1-2% and the vulcanizing accelerator accounts for 1-2%. The sound-absorbing cotton for the automobile muffler has the characteristics of high temperature resistance and flame resistance because the flame-retardant-type polyether polyol is contained, has the effect of absorbing a sulfide in a tail gas because the vulcanizing accelerator is contained, and has better strength, an excellent sound-absorbing property, and a wide sound-absorbing frequency range, so defects ofcurrent sound-absorbing cotton can be remedied.

Description

technical field [0001] The invention relates to a method for preparing sound-absorbing cotton, in particular to a method for preparing sound-absorbing cotton suitable for being installed in automobile mufflers, and belongs to the technical field of automobile manufacturing. Background technique [0002] The automobile muffler is mainly used to reduce the noise generated when the engine of the motor vehicle is working. The principle is that the automobile exhaust pipe is composed of two pipes with different lengths. The difference is equal to half of the wavelength of the sound waves emitted by the car, so that the two columns of sound waves interfere with each other when they are superimposed to cancel each other out and weaken the sound intensity, so that the transmitted sound is reduced, thereby achieving the effect of noise reduction. [0003] Automobile mufflers can be divided into three types: resistive muffler, resistive muffler and impedance composite muffler accordin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L71/00C08L63/00
CPCC08L71/00C08L2201/02C08L2201/08C08L63/00
Inventor 杜云龙
Owner 徐州瑞田工程机械有限公司
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