Properties of Natural Rubber/Chloroprene Rubber Blend for Rubber Fender Application: Effects of Blend Ratio

Abstract

Natural rubber is widely known to possess good mechanical properties. However, due to the existence of numerous reactive double bonds on the molecular backbone, natural rubber is highly susceptible to degradation by thermal aging. To overcome such shortcomings, natural rubber is frequently blended with synthetic rubbers such as chloroprene rubber. Chloroprene rubber is one of the most important specialty rubber for nontire application, for example rubber fender. The present study investigates the effects of two different blend ratios of natural rubber (standard Indonesian rubber or SIR 10) and chloroprene rubber on the cure, tensile properties, and morphology of rubber blends. The blends of SIR 10/chloroprene rubber are prepared by using laboratory kneader and laboratory two‐roll mill. Rubber blending is made from mixture of natural rubber SIR 10 and synthetic rubber chloroprene rubber with variation of SIR 10/chloroprene rubber ratio PF1 100/0; PF2 70/30; PF3 30/70; PF4 0/100 phr. Furthermore, each variable is tested to determine the rheological and mechanical properties including tensile strength, elongation at break, hardness, and compression set. The addition of chloroprene rubber also causes an increment in the tensile strength and elongation at break. However, only PF3 shows satisfied result compared to the requirements standard (ISO 17357‐1:2014 Ship and Marine Technology‐Floating Pneumatic Rubber Fenders).

Preparation of Poly(acrylic acid-co-acrylamide)-Grafted Deproteinized Natural Rubber and Its Effect on the Properties of Natural Rubber/Silica Composites

“…The specimens for tensile measurement were prepared by cutting them into a dumbbell shape according to ASTM D412 [ 30 ]. For tear measurement, the specimens were followed by ASTM D624 [ 31 ]. The measurement was performed using the universal testing machine 5569 (Instron, Norwood, MA, USA) under the condition of crosshead speed of 500 mm/min with a 10 kN load cell.…”

Formulasi paduan karet alam/kloroprena dalam rancangan material komposit karet untuk bantalan isolator tahan gempa

“…Struktur makromolekul baik NR maupun CR dapat mengalami strain induced crystallization pada saat diregangkan, yang menyebabkan kedua jenis karet ini memiliki kuat tarik yang besar (Ismail & Leong, 2001). Kemampuan kristalisasi NR dan CR diakibatkan karena kedua karet memiliki struktur makromolekul yang sama, hanya gugus metil pada NR digantikan oleh atom Cl pada struktur molekul CR (Anggaravidya et al, 2020). Dari Gambar 4 juga terlihat bahwa dengan bertambahnya komposisi NR dalam paduan vulkanisat karet CR/NR, maka diperoleh nilai kuat tarik yang cenderung fluktuatif.…”

Changes in crosslinking structure of thermo‐oxidative aging chloroprene rubber and its effect on strain‐induced crystallization

“…Chloroprene rubber (CR) is a self-crystallizing elastomer with high molecular regularity, widely used in flexible conduits, lifeboats, fuel system sealing and corrosionresistant coatings. 1,2 And its crystal structure is similar to natural rubber (NR). While compared with NR, it has better durability, lower oxidation rate, and lower sensitivity to swelling in non-polar solvents.…”

“…Chloroprene rubber (CR) is a self‐crystallizing elastomer with high molecular regularity, widely used in flexible conduits, lifeboats, fuel system sealing and corrosion‐resistant coatings 1,2 . And its crystal structure is similar to natural rubber (NR).…”