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Low-odor rubber sealing material and preparation method thereof

A rubber sealing, low odor technology, applied in the field of automobile door sealing, can solve the problems of high cost, cumbersome process, unstable adsorption performance, etc., and achieve the effects of improving production efficiency, low overall cost, and fast material turnover.

Pending Publication Date: 2019-11-01
NINGBO GEELY AUTOMOBILE RES & DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The odor produced by automobile sealing strips mainly comes from the residue of raw materials, especially at high temperature, the residual raw materials will volatilize from the sealing strip products, which will affect the odor quality in the sealed space
[0005] In order to meet the odor requirements, an improvement scheme is to add physical adsorbents to EPDM rubber to adsorb odor molecules, but the disadvantage of this scheme is that the adsorption performance is not stable when heated in summer
Another improvement scheme is to adopt the method of secondary treatment after the product is formed, but the process of this scheme is cumbersome, low in efficiency and high in cost
Another improvement is to use liquid raw rubber instead of softener to meet the processability of the process, but the cost is too high
Therefore, it is difficult for existing technical solutions to achieve good results in terms of comprehensive performance in terms of physical properties, cost, odor and stability.

Method used

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  • Low-odor rubber sealing material and preparation method thereof
  • Low-odor rubber sealing material and preparation method thereof
  • Low-odor rubber sealing material and preparation method thereof

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preparation example Construction

[0043] The application also provides a method for preparing the low-odor rubber sealing material, comprising the steps of:

[0044] (1) The first stage of mixing. Specifically:

[0045] First, add 100 parts of EPDM rubber, 5-7 parts of zinc oxide and 1-2 parts of stearic acid into the internal mixer, and banbury at a temperature of 60-80°C for 40-60 seconds. Preferably, at the end of this banburying, the top bolt is lifted up, in order to discharge the small molecular substances carried in the raw materials.

[0046] Then, continue to add 60-90 parts of fast extrusion carbon black, 30-60 parts of semi-reinforced carbon black, 70-100 parts of white calcium carbonate and 50-80 parts of paraffin oil in the internal mixer, and mix until 150- Discharging at 165°C. Preferably, the top bolt is lifted 1-2 times in the middle to volatilize some small molecular organic compounds.

[0047] Then, thin pass on the open mill, filter on the rubber filter, and release the sheet from the o...

Embodiment 1

[0057] First, weigh 100 parts of EPDM rubber, 65 parts of fast extrusion carbon black, 60 parts of semi-reinforcing carbon black, 80 parts of white material calcium carbonate, 65 parts of paraffin oil, 7 parts of zinc oxide, and 1.5 parts of stearic acid , 3 parts of polyethylene glycol, 5 parts of accelerator Perlorax ZET / S, 2.5 parts of accelerator CLD-80, 2 parts of sulfur, and 8 parts of hygroscopic agent. The white material calcium carbonate has not been activated beforehand.

[0058] Next, add EPDM rubber, zinc oxide and stearic acid into the internal mixer at a temperature of 60-80°C and internally knead for 40-60 seconds. Next, add carbon black, white material and paraffin oil into the internal mixer, and mix to 155-165°C to obtain the rubber compound; Small molecule organics exit the mixer. Subsequently, it is thinly passed on the mill, filtered with a rubber filter, and the sheet is released from the mill. At this time, the rubber compound was cooled to room tempe...

Embodiment 2

[0063] First, weigh 100 parts of EPDM rubber, 75 parts of fast extrusion carbon black, 50 parts of semi-reinforcing carbon black, 75 parts of white material calcium carbonate, 70 parts of paraffin oil, 6 parts of zinc oxide, and 1 part of stearic acid , 2 parts of polyethylene glycol, 4.5 parts of accelerator Perlorax ZET / S, 3 parts of accelerator CLD-80, 1.5 parts of sulfur, and 8 parts of hygroscopic agent.

[0064] Next, add EPDM rubber, zinc oxide and stearic acid into the internal mixer at a temperature of 60-80°C and internally knead for 40-60 seconds. Next, add carbon black, white material and paraffin oil into the internal mixer, and knead to 155-165°C to obtain the rubber compound; preferably, the small molecular organic matter generated during the mixing process is discharged from the internal mixer 1- 2 times. Subsequently, it is thinly passed on the mill, filtered with a rubber filter, and the sheet is released from the mill. At this time, the rubber compound was...

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Abstract

The invention provides a composition of a low-odor rubber sealing material. The composition is used for preparing the low-odor rubber sealing material, wherein a dithiophosphate accelerator without containing ammonia / amine is adopted as an accelerator, and nitrosamines and sulfides are not generated in a vulcanization process. The invention also provides a preparation method of the low-odor rubbersealing material, extrusion is controlled at a high extrusion temperature and a low extrusion speed, and volatilization of carried micromolecular substances is facilitated. Therefore, a prepared rubber sealing strip is low in odor and cannot volatilize gas with pungent smell at a high temperature.

Description

technical field [0001] The invention relates to the technical field of automobile door sealing, in particular to a low-odor rubber sealing material for automobiles and a preparation method thereof, in particular to an automobile sealing strip and a preparation method thereof. Background technique [0002] The car door seal strip is mainly made of EPDM rubber compounded and vulcanized. It is installed on the car door and squeezed together with the door frame when the door is closed. It mainly plays the role of door sealing, dustproof, shockproof and The function of anti-noise is an indispensable part of the car interior. However, after vulcanization of rubber, there will be a large smell, which will be more obvious in a closed environment. People will feel unpleasant and uncomfortable after smelling this smell, and even the smell will affect people's health. [0003] With the improvement of people's awareness of environmental protection and safety, rubber sealing strips, whi...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08L71/02C08L91/06C08K13/06C08K9/06C08K3/04C08K3/22C08K5/09C08K5/5398C08K5/372C08K13/02
CPCC08L23/16C08K2003/2296C08K2003/265C08L2205/03C08L71/02C08L91/06C08K13/06C08K9/06C08K3/04C08K3/22C08K5/09C08K5/5398C08K5/372C08K13/02
Inventor 刘云李卫红郑文杰
Owner NINGBO GEELY AUTOMOBILE RES & DEV CO LTD
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