Correlations between natural rubber protein content and rapid predictions of rheological properties, compression set and hardness of rubber compound

2021 ◽  
Vol 98 (11) ◽  
pp. 100162
Author(s):  
Masoumeh Sadeghi ◽  
Mercedeh Malekzadeh ◽  
Saeed Taghvaei-Ganjali ◽  
Fereshteh Motiee
2019 ◽  
Vol 1 (1) ◽  
pp. 16-20
Author(s):  
Ade Sholeh Hidayat ◽  
Dewi Kusuma Arti ◽  
Lies Agustine ◽  
Mahendra Aggaravidya

The rheological properties of rubber compound in general application and especially rubber airbag compounding is very important to predict the mechanical properties of rubber products, as well as useful for obtaining optimum formulations in the research and development of a product. The viscoelastic properties of the rubber compound are strongly influenced by the type of rubber and the filler used. The purpose of this research is to investigate the rheological properties of rubber airbag compounding using natural rubber (NR) and high cis butadiene rubber (BR) materials with various compositions of carbon black N220 filler. The mixing of NR and BR with 90/10 phr ratio was performed in a kneader, with carbon black N220 filler variation: 35, 45, 50 phr, named as BD1, BD2 and BD3, respectively. Rheology and viscosity properties were tested using Rubber Process Analyser (RPA) 2000 Alpha Technology. The test was performed with strain sweep at 70 C and comparing 1% strain and 10% strain to indicate dispersion and homogenity. Frequency sweep was performed at 100 C at 6 cpm and 7% strain.  High strain sweep was also done as well as strain sweep after cure (ASTM D6601) which material were cured at 1800 C and strain sweep was applied at 1%, 2%, 5%, 10% and 20% to determine the mechanical properties of compound. The result showed that 35 phr of carbon black N220 (BD1) was the optimum formulation since compounds BD3 and BD2 have higher elastic torque (S’) peaks and may be harder to process as a result. The results for Tan (Delta) from all compounds in the high strain sweep verify that compounds BD3 and BD2 have lower Tan(Delta) values and therefore will probably have more difficulty in processing. The highest peak of modulus values at low strain indicates the carbon black with the highest reinforcement or the worst dispersion. BD3 and BD2 have high peak modulus value which is show the worse dispersion compared to BD1. Keywords: rheology, rubber airbag, filler, RPA


2013 ◽  
Vol 747 ◽  
pp. 571-574 ◽  
Author(s):  
Zulkifli Mohamad Ariff ◽  
T.H. Khang

The possibility of using Cadmould software to simulate the filling behaviour of a natural rubber compound during an injection moulding process was investigated. For the simulation process, the determination of required material input data involving the rheological and cure kinetics data of the designed rubber compound were conducted. It was discovered that the acquired data were able to function as reliable material input data as they were comparable with related data available in the Cadmould software materials database. Verification of the simulated filling profiles by experimental short shots specimens showed that the Cadmould Rubber Package was able to predict the realistic filling behaviour of the formulated natural rubber compound inside the mould cavity when the measured material data were utilized. Whereas, the usage of available material database from the software failed to model the mould filling progression of the intended natural rubber compound.


2009 ◽  
Vol 25 (2) ◽  
pp. 113-128 ◽  
Author(s):  
P. Raju ◽  
V. Nandanan ◽  
Sunil K.N. Kutty

Mechanical properties and the thermal degradation characteristics of natural rubber compounds with calophyllum inophyllum oil were compared to that of the control compound containing naphthenic oil. The compounds containing calophyllum inophyllum oil showed improved tensile strength, tear strength, modulus, compression set, abrasion resistance and resilience. Cure time was higher than the naphthenic oil mixes. Thermal studies showed an increase of 8 °C in the temperature of initiation of degradation and an increase of 6 °C in temperature at which the peak rate of degradation occurred. The peak rate of degradation was comparable to the control mix containing naphthenic oil.


2014 ◽  
Vol 63 ◽  
pp. 242-248 ◽  
Author(s):  
Ramez A. Al-Mansob ◽  
Amiruddin Ismail ◽  
Aows N. Alduri ◽  
Che Husna Azhari ◽  
Mohamed Rehan Karim ◽  
...  

2013 ◽  
Vol 844 ◽  
pp. 239-242 ◽  
Author(s):  
Supaporn Ieadsang ◽  
Anoma Thitithammawong ◽  
Charoen Nakason ◽  
Azizon Kaesaman

Modified epoxidized palm oil (pA-m-EPO) was prepared by a reaction of epoxidized palm oil (EPO) with n-phenyl-p-phenylenediamine. Chemical structure of the pA-m-EPO was characterized by using FT-IR spectrophotometer. Influence of the pA-m-EPO on bound rubber content, total mixing energy, Mooney viscosity and curing characteristics of carbon black filled natural rubber compound together with mechanical and morphological properties of carbon black filled natural rubber vulcanizates was later studied. Results showed that the NR compound and vulcanizate with using the pA-m-EPO gave inferior properties than those of using the aromatic oil. However, they provided better properties than those of the treated distillate aromatic extract (TDAE) excepting filler dispersion. Furthermore, the pA-m-EPO can be claimed as non-carcinogenic processing oil with low polycyclic aromatic hydrocarbons.


2000 ◽  
Vol 73 (5) ◽  
pp. 902-911 ◽  
Author(s):  
Amit K. Naskar ◽  
S. K. De ◽  
A. K. Bhowmick ◽  
P. K. Pramanik ◽  
R. Mukhopadhyay

Abstract Ground rubber tire (GRT) particles of different sizes were characterized and the effect of these particles in a natural rubber (NR) compound was studied. It is found that smaller particles contain less polymer, but have higher amounts of fillers and metals with respect to polymer. NR compound containing smaller GRT particles shows better physical properties, but poorer aging characteristics.


2021 ◽  
Vol 28 (10) ◽  
Author(s):  
Jeong-Hwan Yoon ◽  
Seung-Won Lee ◽  
Seok-Hu Bae ◽  
Nam-Il Kim ◽  
Ju-Ho Yun ◽  
...  

2019 ◽  
Vol 56 (2) ◽  
pp. 124
Author(s):  
Devendra Pratap ◽  
Rakhi Singh ◽  
Ankur Ojha

The present investigation was carried out to evaluate the feasibility of fortification of soymilk with standardized milk for the production of fortified nutritive milk formulation. The functional properties of cattle milk can be enhanced by blending of soy milk. The soymilk was obtained by using standard procedure by grinding soaked seeds of soybean with hot water (bean to water ratio, 1: 4 w/v). In the present study three formulations of soy and standardized milk were prepared as follows T<sub>1</sub> (100% soymilk), T<sub>2</sub> (50% soymilk: 50% standardized milk), T<sub>3</sub> (60% soymilk: 40% standardized milk), and T<sub>4</sub> (70% soymilk: 30% standardized milk) and Control as T<sub>0</sub> (standardized milk). The changes in physico-chemical, sensory and rheological properties were recorded. The results revealed that overall organoleptic acceptability scores of formulated milks formulations were 6.9, 8.06, 7.65, 7.04 and 8.49 for the formulation T<sub>1</sub>, T<sub>2</sub>, T<sub>3</sub>, T<sub>4</sub> and T<sub>0</sub>, respectively. Fat, total solids, titratable acidity, pH, ash and solid non fat content were decreased with increasing soymilk proportion, while moisture and protein content were increased. The blending of different ratio of soymilk with standardized milk had significant affect on colour attributes (L*, a* and b*). Yellowness and greenness increased while lightness decreased as the proportion of soymilk increased.


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