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EPDM/ natural rubber combined ageing-resistant rubber and preparation method thereof

A natural rubber, aging-resistant technology, applied in the production of bulk chemicals, etc., can solve the problems of low heat resistance, low corrosion resistance to acid and alkali, easy aging and deterioration, etc., to meet performance requirements, reduce surface tension, The effect of excellent aging resistance and mechanical properties

Inactive Publication Date: 2018-11-20
NINGGUO ZHENGDAO RUBBER & PLASTIC PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural rubber (NR) has high elasticity, high elongation strength, excellent tear resistance and electrical insulation, good wear resistance and drought resistance, good processability, easy to bond with other materials, and is superior to most synthetic materials in terms of comprehensive performance. Rubber, but the disadvantage is that it is easy to age and deteriorate, and has low resistance to acid and alkali corrosion; heat resistance is not high

Method used

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  • EPDM/ natural rubber combined ageing-resistant rubber and preparation method thereof
  • EPDM/ natural rubber combined ageing-resistant rubber and preparation method thereof
  • EPDM/ natural rubber combined ageing-resistant rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of EPDM / natural rubber is combined with anti-aging rubber, and described anti-aging rubber is made up of following raw materials in parts by weight:

[0026]

[0027]

[0028] A kind of preparation method of EPDM / natural rubber combined with anti-aging rubber, comprises the following steps:

[0029] (1) Preparation of EPDM masterbatch: Add EPDM to an internal mixer and plasticize at 90°C for 3 minutes, then add stearic acid, zinc oxide and carbon black in turn and mix for 15 minutes to obtain EPDM masterbatch;

[0030] (2) Preparation of natural masterbatch: adding natural rubber to an internal mixer and plasticizing at 70°C for 3 minutes, then adding stearic acid and magnesium oxide in turn to mix for 15 minutes to obtain natural masterbatch;

[0031] (3) EPDM / natural rubber mixing: first add EPDM masterbatch, natural masterbatch, accelerator and anti-aging agent sulfur into the internal mixer for 3 minutes of intensive mixing, then add sulfur for intensiv...

Embodiment 2

[0034] A kind of EPDM / natural rubber is combined with anti-aging rubber, and described anti-aging rubber is made up of following raw materials in parts by weight:

[0035]

[0036]

[0037] A kind of preparation method of EPDM / natural rubber combined with anti-aging rubber, comprises the following steps:

[0038] (1) Preparation of EPDM masterbatch: Add EPDM to an internal mixer and plasticize at 80°C for 10 minutes, then add stearic acid, zinc oxide and carbon black in turn and mix for 5 minutes to prepare EPDM masterbatch;

[0039] (2) Preparation of natural masterbatch: adding natural rubber to an internal mixer and plasticizing at 60° C. for 10 minutes, then adding stearic acid and magnesium oxide in turn for 5 minutes to prepare natural masterbatch;

[0040] (3) EPDM / natural rubber mixing: first add EPDM masterbatch, natural masterbatch, accelerator and anti-aging agent sulfur into the internal mixer for 1min, then add sulfur for 4min. Extrude and cut into pellets,...

Embodiment 3

[0043] A kind of EPDM / natural rubber is combined with anti-aging rubber, and described anti-aging rubber is made up of following raw materials in parts by weight:

[0044]

[0045] A kind of preparation method of EPDM / natural rubber combined with anti-aging rubber, comprises the following steps:

[0046] (1) Preparation of EPDM masterbatch: Add EPDM to an internal mixer and plasticize at 85°C for 5 minutes, then add stearic acid, zinc oxide and carbon black in turn and mix for 12 minutes to prepare EPDM masterbatch;

[0047] (2) Preparation of natural masterbatch: add natural rubber to an internal mixer and plasticize at 65°C for 6 minutes, then add stearic acid and magnesium oxide in turn and mix for 11 minutes to obtain natural masterbatch;

[0048] (3) EPDM / Natural Rubber Mixing: First add EPDM masterbatch, natural masterbatch, accelerator and anti-aging agent sulfur into the internal mixer for 2 minutes, and then add sulfur for 10 minutes. Extrude and cut into pellets,...

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Abstract

The invention discloses an EPDM / natural rubber combined ageing-resistant rubber and a preparation method thereof. The method comprises the following steps: (1) preparing EPDM masterbatch; (2) preparing natural masterbatch; (3) mixing EPDM / natural rubber; and (4) vulcanizing the rubber compound and a vulcanizing agent for 20-60min in a vulcanizing machine in order to form to obtain the ageing-resistant rubber. According to the method, a supercritical carbon dioxide technology is carried out, the PEDM / natural rubber mixed rubber is subjected to supercritical treatment before vulcanizing, so that the compatibility and the co-vulcanization performance of the two-phase rubbers can be extremely improved, and the vulcanizing rate of the rubber compound is effectively increased; and the obtained rubber realizes the effective combination of the outstanding performances of the EPDM / natural rubber; the prepared rubber is outstanding in ageing resistance and mechanical performance and meets the performance demand of various special environments to a sealing material.

Description

technical field [0001] The invention relates to the technical field of rubber materials, in particular to an EPDM / natural rubber composite aging-resistant rubber and a preparation method thereof. Background technique [0002] Rubber materials are highly elastic polymer materials with reversible deformation. It is elastic at room temperature, can produce large deformation under a small external force, and can return to its original shape after the external force is removed. Rubber is divided into natural rubber and synthetic rubber. Synthetic rubber is used in different environments and has the conditions to adapt to the working environment. Ethylene-propylene-diene rubber (EPDM) is a terpolymer of ethylene, propylene and non-conjugated dienes. It has good heat resistance, water resistance and aging resistance. Peroxide cross-linked EPDM is used for Higher temperature resistance, lower compression set and insulation for the wire and cable industry. Natural rubber (NR) has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L7/00C08K13/02C08K3/04C08K3/22C08K3/06C08K5/09C08K5/14C08J9/12
CPCC08J9/122C08J2203/06C08J2323/16C08J2407/00C08K2003/222C08K2003/2296C08L23/16C08L7/00C08K13/02C08K3/04C08K3/22C08K3/06C08K5/09C08K5/14Y02P20/54
Inventor 夏礼安
Owner NINGGUO ZHENGDAO RUBBER & PLASTIC PARTS
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