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Ethylene-propylene-diene monomer composite elastomer and preparation method thereof

A technology of EPDM and elastomer, which is applied in the field of EPDM composite elastomer and its preparation, can solve the problem that the relationship between molecular structure and damping performance has not been fully established, high damping mechanical properties are not easy to balance, and the damping mechanism cannot be explained Clarity and other issues to achieve the effect of enhancing strength and toughness, improving damping performance and prolonging service life

Inactive Publication Date: 2018-06-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still some problems to be solved urgently in EPDM materials, for example, the relationship between molecular structure and damping performance has not been fully established; the explanation of the newly derived damping mechanism (such as dynamic bond, gradient composition / structure) is still unclear; high It is not easy to balance damping and excellent mechanical properties, etc. These problems need further research and solution

Method used

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  • Ethylene-propylene-diene monomer composite elastomer and preparation method thereof
  • Ethylene-propylene-diene monomer composite elastomer and preparation method thereof
  • Ethylene-propylene-diene monomer composite elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) 36g EPDM (100phr), 0.72g MAH (2phr), 0.018g initiator Add 101 (0.05phr) and 0.8g St (nSt=nMAH) into the preheated torque rheometer in a certain order, knead for 8 minutes under the processing conditions of 170°C and 60rpm, and discharge to obtain the graft MAH-g-EPDM, denoted as mEPDM 0 (MAH grafting rate 1.18%).

[0032] (2) the mEPDM of step (1) 0 , antioxidant 1010 (mEPDM 0 0.3wt.%), different amounts of 3-amino-1,2,4-triazole (ATA), add the preheated torque rheometer according to the formula ratio in Table 1 and a certain order, at 160 ℃, 50rpm Mixing under the conditions for 20 minutes, respectively, to obtain ATA functionalized EPDM mEPDM 0 -xATA (x=molar ratio n ATA :n MAH ) series samples.

[0033] Table 1

[0034]

[0035] (3) Use an open mill to mix mEPDM 0 -ATA(n ATA :n MAH =1) 100phr, 5phr of zinc oxide, 1phr of stearic acid, 1.5phr of TMTD, different amounts of zinc chloride, 1.5phr of sulfur are added according to the formula ratio in Ta...

Embodiment 2

[0041] Step (1) and step (2) are the same as embodiment 1.

[0042] (3) Use an open mill to mix mEPDM 0 -ATA(n ATA :n MAH =1) 100phr, different amounts of precipitated silica (n phrCW) 10 / 20phr, zinc oxide 5phr, stearic acid 1phr, TMTD1.5phr, zinc chloride (nZn:nMAH=y; y=0.4), sulfur 1.5 The phr is fed in a certain order, and the materials are mixed evenly by using the inclined knife method, and the triangular bag is made, rolled, and the film is produced after six times of thinning, and the mEPDM is prepared. 0 -ATA-yZn-nCW series rubber compound. The rubber was parked for 12 hours, and vulcanized on a flat vulcanizing machine at 160°C and 10MPa pressure. The vulcanization time was Tc90, and mEPDM-ATA-yZn-nCW series elastomers were obtained, and mEPDM-ATA-0.4Zn-10CW was recorded as sample 3 .

[0043] The preparation process of mEPDM-ATA-yZn-nCW vulcanizate in this embodiment is shown in figure 2 .

Embodiment 3

[0045] Step (1) and step (2) are the same as embodiment 1.

[0046] (3) Use an open mill to mix mEPDM 0 -ATA (nATA:nMAH=1) 100phr, different amounts of terpene resin (q phrCH) 2 / 8 / 16 / 32phr, zinc oxide 5phr, stearic acid 1phr, TMTD1.5phr, zinc chloride (nZn:nMAH=y ; y=0.4), sulfur 1.5phr are fed in a certain order, use the oblique knife method to mix the materials evenly, make triangular bags, rub rolls, thin pass six times and then go out, and prepare mEPDM 0 -ATA-yZn-qCH series rubber compound. The rubber was parked for 12 hours, and vulcanized on a flat vulcanizing machine at 160°C and 10MPa pressure. The vulcanization time was Tc90, and mEPDM-ATA-yZn-qCH series elastomers were obtained, and mEPDM-ATA-0.4Zn-32CH was recorded as sample 4 .

[0047] For the preparation process of mEPDM-ATA-yZn-qCH vulcanizate in this example, see image 3 .

[0048] The results of the cyclic loading and unloading test of samples 1 to 4 obtained in the above examples and the comparison sam...

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Abstract

The invention belongs to the technical field of polymer materials, and discloses an ethylene-propylene-diene monomer composite elastomer and a preparation method thereof. The preparation method comprises the following steps: adding EPDM (ethylene-propylene-diene monomer), an initiator, MAH (maleic anhydride) and St (styrene) into a mixing device for carrying out mixing, so as to obtain MAH-g-EPDM;adding the MAH-g-EPDM, ATA (3-amino-1,2,4-triazole) ligands and an antioxidant into the mixing device for carrying out mixing to obtain ATA-functionalized EPDM; and carrying out uniform mixing on theATA-functionalized EPDM, a zinc chloride metal salt and a vulcanization system, and then carrying out vulcanization to obtain the ethylene-propylene-diene monomer composite elastomer. According to the invention, through the construction a dynamic cross-linking network structure with multiple hydrogen bonds and metal-ligand coordination and the synergy of a covalent bond chemical cross-linking network, the strength and toughness of the EPDM is enhanced, the rubber viscoelasticity is effectively adjusted, the damping performance of the EPDM is improved, a self-repairing property is provided tothe material, micro-damage can be repaired autonomously under a heat environment, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an EPDM composite elastomer and a preparation method thereof. Background technique [0002] Viscoelastic damping materials play a huge role in the field of vibration and noise reduction technology. Rubber is the most widely used viscoelastic damping material, but most of the rubber matrix has poor mechanical properties, low tensile strength and poor toughness, and it is easy to damage the network structure and fail under strong vibration conditions, which limits its further application. In recent years, with the development of supramolecular chemistry, researchers have modified the material structure through molecular design, and used non-covalent bonds to construct a dynamic cross-linked network, which has improved the strength and toughness of the material, and endowed it with self-healing properties. The design of high-performance damping rubber provides...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/04C08L45/00C08K3/16C08K5/134C08K3/22C08K5/09C08K13/02C08F255/06C08F8/32
CPCC08F8/32C08F255/06C08K3/16C08K3/22C08K5/09C08K5/1345C08K13/02C08L51/04C08K2003/2296C08K2003/168C08L45/00C08F222/08C08F212/08
Inventor 何和智李晓青张民爱
Owner SOUTH CHINA UNIV OF TECH
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