Vulcanization of chlorinated polyethylene / chloroprene rubber compounds at lower temperatures in the presence of reactive silanes

The curing system plays a vital role in designing rubber compounds for various industrial applications. Therefore, it is paramount to establish viable curing strategies for any new elastomer to explore its application potentials and commercial significance. Impacts of different curing regimes on the properties of a recently developed copolymer of chloroprene and acrylonitrile (acrylonitrile-chloroprene rubber, NCR) are reported here. Several primary accelerators (four from thiourea- and one from thiazolene product families) were used for curing the new rubber along with fixed loadings of zinc oxide (5 phr) and magnesium oxide (4 phr). Besides, curatives based on sulfur and peroxide were also evaluated. The influence of different curing systems on the rheological and physical properties of the copolymer was explored. It has been seen that the properties of the copolymer are considerably influenced by the different curing systems used. While ethylene thiourea (ETU) and propylene thiourea (PTU), as primary accelerators, provide the highest state of cure but may cause scorch. The use of trimethyl thiourea (TMU), on the other hand, results in the fastest rate and the most stable state of cure, good scorch safety, bin stability, and an overall good balance of properties. The sulfur-based crosslinking system induces good mechanical properties but causes limited bin stability, poor high-temperature compression set, and impaired heat resistance properties. As a curing agent, peroxide delivers the best bin stability in the rubber stocks but yields higher stiffness and limited aging resistance in the vulcanizates.

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Specification for vulcanized chloroprene rubber compounds

10.3403/30307946 ◽

1975 ◽

Keyword(s):

Rubber Compounds ◽

Chloroprene Rubber

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Cure Characteristic and Mechanical Properties of Epoxidized Natural Rubber/Chloroprene (ENR/CR) Blends

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.93-94.631 ◽

2010 ◽

Vol 93-94 ◽

pp. 631-634

Author(s):

Chanchai Thongpin ◽

Piyaporn Niltui ◽

Piyapong Sornwaneenawakhun ◽

Tossaporn Maneeprom ◽

Saovaros Malithong ◽

...

Keyword(s):

Mechanical Properties ◽

Natural Rubber ◽

Epoxidized Natural Rubber ◽

Maximum Torque ◽

Tear Strength ◽

Rubber Compounds ◽

Cure Time ◽

Chloroprene Rubber ◽

Cure Characteristic ◽

Two Phases

Epoxidized Natural rubber (ENR) with the epoxide content of 40 % was prepared and blended with various contents of chloroprene rubber (CR) and 50 phr of carbon black. The cure characteristic, mechanical properties and the effect of gasohol E-85 on the mechanical properties of the rubber vulcanizate were studied. It was revealed from cure characteristic results, tested by Moving Die Rheometer (MDR), that minimum torque of the rubber compounds increased with the content of CR whereas maximum torque tended to increase at the content of 10 phr and decrease after this content, of which the values agreed well with the modulus at 100% elongation in rubber vulcanizates. Considering characteristic scorch and cure time, the values increased with the CR contents. It was clear from the result that at the ENR:CR ratio of 90:10, modulus of 100% elongation and tear strength exhibited the highest values. It was also found that the mechanical properties of the blend vulcanizates were slightly suffered by gasohol E85 except for tear strength. It was understood that this must be because of the effect of the phase continuity and crosslinking that occurred differently in two phases. The phase morphology of the blends were also investigated and reported in the research.

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Synthesis on Modified Chloroprene Rubber Adhesive Dedicated to Bonding UHMWPE and 45# Steel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.2868 ◽

2012 ◽

Vol 472-475 ◽

pp. 2868-2873 ◽

Cited By ~ 1

Author(s):

Qin Qin Luo ◽

Ping Hu ◽

Ting Yue Zhang ◽

Xian Jiang Xiong

Keyword(s):

Bonding Strength ◽

X Ray Diffraction ◽

Adhesive Film ◽

Chlorinated Polyethylene ◽

X Ray ◽

Bonding Effect ◽

Chloroprene Rubber ◽

Prepared Composite ◽

Optimum Formula ◽

Adhesive Effect

Methyl methacrylaten (MMA) was used to solution graft onto and modify chloroprene rubber (CR) to improve its adhesive strength. And chlorinated polyethylene (CPE) and magnesium oxide (MgO) were added to the optimum formula system of CR/MMA adhesive to prepare a better adhesive effect of CR/MMA/CPE /MgO adhesive dedicated to bonding UHMWPE and 45# steel. The performance of adhesive film was analyzed by Infrared spectroscope (IR), X-ray diffraction (XRD) and Comprehensive thermal analysis (TG-DTG). The results show that CR being grafted and modified by MMA and adding CPE and MgO in the optimum formula of CR-MMA adhesive can improve itself bonding effect of glue solution and the wetting effect of glue solution onto bonding interface, and all helped to improve bonding strength. Adding 18% of CPE and 8% of MgO (in relation to CR) in the optimum formula of CR-MMA which bonding strength is up to 0.8013MPa could make the prepared composite adhesive’ s bonding strength reach 1.2048MPa and heat resistance temperature be up to about 200°C.

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