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CN-122011604-A - Ethylene propylene diene monomer rubber sealing strip and preparation method thereof

CN122011604ACN 122011604 ACN122011604 ACN 122011604ACN-122011604-A

Abstract

The invention discloses an ethylene propylene diene monomer rubber sealing strip and a preparation method thereof, and relates to the technical field of sealing materials. The ethylene propylene diene monomer sealing strip at least comprises the following raw materials, by mass, 100 parts of ethylene propylene diene monomer, 40-70 parts of carbon black-white carbon black coated reinforcing agent, 5-20 parts of zinc methacrylate, 5-15 parts of double modified montmorillonite, 3-10 parts of modified lignocellulose, 1-3 parts of silane coupling agent, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 10-25 parts of plasticizer, 1-3 parts of vulcanizing agent and 1.5-4 parts of accelerator. The ethylene propylene diene monomer rubber sealing strip obtained by the invention has the advantages of excellent mechanical property, strong dimensional stability, low compression set rate and good sound insulation and flame retardance effects.

Inventors

  • YUE DONGYUE
  • YU LIANGHUA

Assignees

  • 宁波经济技术开发区庆辉塑业有限公司

Dates

Publication Date
20260512
Application Date
20260323

Claims (10)

  1. 1. The ethylene propylene diene monomer rubber sealing strip is characterized by at least comprising the following raw materials in parts by mass: 100 parts of ethylene propylene diene monomer rubber, 40-70 parts of carbon black-white carbon black coated reinforcing agent, 5-20 parts of zinc methacrylate, 5-15 parts of double modified montmorillonite, 3-10 parts of modified lignocellulose, 1-3 parts of silane coupling agent, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 10-25 parts of plasticizer, 1-3 parts of vulcanizing agent and 1.5-4 parts of accelerator; Wherein, the double modified montmorillonite is montmorillonite which is synergistically modified by hexadecyl trimethyl ammonium bromide and gamma-methacryloxypropyl trimethoxy silane; the modified lignocellulose is lignocellulose which is grafted and modified on the surface of gamma-methacryloxypropyl trimethoxy silane.
  2. 2. The ethylene propylene diene monomer rubber sealing strip according to claim 1, wherein the preparation method of the double modified montmorillonite at least comprises the following preparation steps: Dispersing montmorillonite in deionized water, regulating pH to neutrality, adding hexadecyl trimethyl ammonium bromide water solution, reacting at 60-80 deg.c for 2-4 hr, filtering, washing and drying to obtain intercalated montmorillonite; Dispersing the intercalated montmorillonite in absolute ethyl alcohol, adding a hydrolysate of gamma-methacryloxypropyl trimethoxy silane, adjusting the pH to 4-5, reacting for 2-3h at 60-80 ℃, washing, drying and grinding to obtain the double-modified montmorillonite.
  3. 3. The ethylene propylene diene monomer rubber sealing strip according to claim 2, wherein the mass ratio of the montmorillonite to the hexadecyl trimethyl ammonium bromide to the gamma-methacryloxypropyl trimethoxy silane is 1:0.1-0.3:0.05-0.15.
  4. 4. Ethylene propylene diene monomer rubber sealing strip according to claim 1, characterized in that the preparation method of the modified lignocellulose at least comprises the following preparation steps: Ammonia water, tetraethoxysilane and gamma-methacryloxypropyl trimethoxysilane are added into absolute ethyl alcohol, lignocellulose is added after uniform stirring, and after reaction for 2-6 hours at 30-50 ℃ under the ultrasonic condition, the modified lignocellulose is obtained after washing and drying.
  5. 5. The ethylene propylene diene monomer sealing strip according to claim 4, wherein the length of the lignocellulose is 50-200 μm and the length-diameter ratio is 10-30.
  6. 6. The ethylene propylene diene monomer sealing strip according to claim 4, wherein the mass ratio of lignocellulose to ammonia water to ethyl orthosilicate to gamma-methacryloxypropyl trimethoxysilane is 1:0.5-1.5:0.5-1.5:0.2-0.8, and the concentration of ammonia water is 25-28wt%.
  7. 7. The ethylene propylene diene monomer rubber sealing strip according to claim 1, wherein the preparation method of the carbon black-white carbon black coated reinforcing agent at least comprises the following preparation steps: Regulating the pH value of the sodium silicate solution to 7-8, and standing to obtain seed crystals after gel appears; Adding the seed crystal into a dilute sodium silicate solution, adjusting the pH value to be neutral under the condition of heating in a water bath, adding hexadecyl trimethyl ammonium bromide, adding carbon black for stirring after dissolving, aging, filtering, washing with water, washing with alcohol, filtering and drying after reaction to obtain the carbon black-white carbon black coated reinforcing agent.
  8. 8. The ethylene propylene diene monomer rubber sealing strip according to claim 7, wherein the mass ratio of white carbon black in the carbon black-white carbon black coated reinforcing agent is 20-40%.
  9. 9. The ethylene propylene diene monomer sealing strip according to claim 1, wherein the plasticizer is at least one of paraffin oil, naphthenic oil or dioctyl sebacate, the silane coupling agent is at least one of gamma-methacryloxypropyl trimethoxy silane or vinyl triethoxy silane, the accelerator is at least one of accelerator CZ, accelerator M or accelerator DM, and the vulcanizing agent is at least one of dicumyl peroxide or sulfur.
  10. 10. A method for producing a sealing strip of ethylene propylene diene monomer according to any one of claims 1 to 9, characterized by comprising at least the following steps: Adding ethylene propylene diene monomer into an internal mixer for plasticating, adding zinc oxide, stearic acid, part of carbon black-white carbon black coated reinforcing agent, double modified montmorillonite and modified lignocellulose, mixing, discharging rubber, and adding the rest of carbon black-white carbon black coated reinforcing agent, zinc methacrylate, plasticizer and silane coupling agent, mixing, and discharging rubber to obtain master batch; And adding the masterbatch into an open mill, adding a vulcanizing agent and an accelerator, extruding for molding, and vulcanizing to obtain the ethylene propylene diene monomer rubber sealing strip.

Description

Ethylene propylene diene monomer rubber sealing strip and preparation method thereof Technical Field The invention relates to the technical field of sealing materials, in particular to an ethylene propylene diene monomer rubber sealing strip and a preparation method thereof. Background Along with the increasing promotion of the living standard of people, the demand for the comfort and the safety of the automobile is higher, the sealing performance of the automobile is also focused, and the automobile is one of the key factors for judging the quality of the whole automobile, and the automobile sealing strip product is one of important parts for deciding the quality of the index. The automobile sealing strip products are various, and according to the classification of the scale of the device parts (components), the automobile sealing strip products comprise an engine room sealing strip, a front and back windshield sealing strip, a door frame sealing strip, a door glass guide groove sealing strip, a door lower part dustproof strip, a door windowsill inner and outer sealing strip, a side window sealing strip, a skylight sealing strip, a roof cover sealing strip, a trunk (trunk) sealing strip and the like. Ethylene Propylene Diene Monomer (EPDM) is a preferred material for manufacturing an automobile weather strip because of its saturated structure of the main chain, and has excellent weather resistance, ozone resistance and heat aging resistance. As the automotive industry moves toward higher performance, lighter weight and more comfort, more stringent requirements are placed on the overall performance of the weatherstrip. The ideal automobile sealing strip not only needs to have the waterproof and dustproof functions of a foundation, but also needs to keep stable sealing pressure (namely low compression set) in long-term use, and meanwhile has good sound insulation and noise reduction performance and certain flame retardant safety, so that driving experience and whole automobile safety are improved. Therefore, how to prepare the ethylene propylene diene monomer sealing strip with high toughness, low deformation, shock absorption, sound insulation and excellent flame retardance for the automobile becomes a problem to be solved urgently at present. Disclosure of Invention The invention aims to provide an ethylene propylene diene monomer rubber sealing strip and a preparation method thereof, which solve the following technical problems: the existing ethylene propylene diene monomer rubber sealing strip has the problems of weak mechanical property, poor sound insulation and flame retardance effects and poor dimensional stability. The aim of the invention can be achieved by the following technical scheme: An ethylene propylene diene monomer rubber sealing strip at least comprises the following raw materials in parts by mass: 100 parts of ethylene propylene diene monomer rubber, 40-70 parts of carbon black-white carbon black coated reinforcing agent, 5-20 parts of zinc methacrylate, 5-15 parts of double modified montmorillonite, 3-10 parts of modified lignocellulose, 1-3 parts of silane coupling agent, 3-5 parts of zinc oxide, 1-2 parts of stearic acid, 10-25 parts of plasticizer, 1-3 parts of vulcanizing agent and 1.5-4 parts of accelerator; Wherein, the double modified montmorillonite is montmorillonite which is synergistically modified by hexadecyl trimethyl ammonium bromide and gamma-methacryloxypropyl trimethoxy silane; the modified lignocellulose is lignocellulose which is grafted and modified on the surface of gamma-methacryloxypropyl trimethoxy silane. The preparation method of the double modified montmorillonite at least comprises the following preparation steps: Dispersing montmorillonite in deionized water, regulating pH to neutrality, adding hexadecyl trimethyl ammonium bromide water solution, reacting at 60-80 deg.c for 2-4 hr, filtering, washing and drying to obtain intercalated montmorillonite; Dispersing the intercalated montmorillonite in absolute ethyl alcohol, adding a hydrolysate of gamma-methacryloxypropyl trimethoxy silane, adjusting the pH to 4-5, reacting for 2-3h at 60-80 ℃, washing, drying and grinding to obtain the double-modified montmorillonite. As a further scheme of the invention, the mass ratio of the montmorillonite to the hexadecyl trimethyl ammonium bromide to the gamma-methacryloxypropyl trimethoxy silane is 1:0.1-0.3:0.05-0.15. As a further scheme of the invention, the preparation method of the modified lignocellulose at least comprises the following preparation steps: Ammonia water, tetraethoxysilane and gamma-methacryloxypropyl trimethoxysilane are added into absolute ethyl alcohol, lignocellulose is added after uniform stirring, and after reaction for 2-6 hours at 30-50 ℃ under the ultrasonic condition, the modified lignocellulose is obtained after washing and drying. As a further aspect of the present invention, the length of the lignocellulose is 50-200 μm and the length-dia