effect of immersion in semi synthetics (30% petroleum oil) on compression strength of rubber...

Vol 22, No. 3;Mar 2015

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EFFECT OF IMMERSION IN SEMI SYNTHETICS (30% PETROLEUM OIL) ON COMPRESSION

STRENGTH OF RUBBER COMPOSITE

Ali I. Al-Mosawi 1*, Shaymaa Abbas Abdulsada 2, Ali Amer A.Hadi 3 1 Free Consultation, Babylon, Hilla, IRAQ

2,3 College of Engineering, Materials Department, Kufa University, IRAQ * [email protected]

Abstract

The mixtures used in the rubber industry to modify the properties of rubber, depending on the application field in which the character is used rubber whether subjected to mechanical loads or be in contact with solutions or exposed to sunlight or any other race. These agents are varying the properties of the reinforced rubber, then this research examines the issue of immersion styrene butadiene rubber (SBR) reinforced by polyvinyl chloride (PVC) in cutting fluids used in operation machines on the rubber pillows supplied with these machines. SBR was reinforced by (0,5,10,15,20, and 25pphr) PVC and were studied the effects of immersion in semi synthetics (30% petroleum oil) on the compression strength of SBR-PVC rubber composite for a period of four weeks. The results obtained showed lower compression strength after immersion in solution when compared with original material before immersion, and this decrease in strength will increase, with increases the duration of exposure of the petroleum oil. And the results demonstrated that the compression strength of SBR will enhance by adding PVC. Keywords: Immersion, Rubber composite, Compression strength.

1. INTRODUCTION

Rubber parts exposed to heavy working conditions when used in operating machines, where in

addition to the weights are to be turned out by the contact with the cutting fluids used during the

operation [1]. This making the properties change when exposed to them for long periods [2]. The

level of alteration in the attributes of the user depending on the character of the pieces means, as in

some species cause a slow change in other types of fast depending on the viability of the

penetration of the liquid inside the structure of the rubber [3]. One solution to alleviate the change

in the properties of rubber is mixing with other compounds in order to give new properties most

suitable for such working conditions [4]. Mixing of rubber and resin to make a novel composite

material with distinct characteristics which is an effective and approach to achieve a desired

combination of properties compared to synthesizing new elastomers [5]. On that point are a great

deal of possible benefits of rubber mixtures which qualifies them to exercise in harsh conditions,

and most significant of these advantages: (1) improved solvent resistance; (2) improved

processability; (3) better product uniformity; (4) quick formulation changes and manufacture

flexibility and (5) improved productivity; (6) Resist the penetration of liquids [6]. In general,

rubber and resins immiscible together and phase separates into their constituent parts. For most

applications, the homogeneity is important and is ideal for the performance of more than one

molecular miscibility. Normally, the heterogeneity desirable to maintain the individual features of

rubber compounds [7].

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2. MATERIALS AND METHODS.

2.1. Materials 2.1.1. Styrene-butadiene rubber (SBR) Styrene-butadiene rubber is a copolymer composed of 1,3-butadiene and styrene which is mixed together with 3:1 ratio respectively [2].Figure 1 represent Styrene-butadiene rubber molecule.

Figure 1. Styrene-butadiene rubber molecule [10]

2.1.2. Polyvinyl chloride (PVC) Polyvinyl Chloride (PVC) is a polymer made by the catalytic polymerization of vinyl chloride, and also includes copolymers that contain at least 50% vinyl chloride. The features of neat homopolymer are hard, brittle and difficult to process, but it becomes flexible when plasticized [9]. Figure 2 represent Polyvinyl Chloride molecule.

Figure 2. Polyvinyl Chloride [11]

2.1.3. Semi synthetics (30% petroleum oil) It is a combination of hybrid of soluble oils and synthetics, which also refers to the semi-chemical fluids. They contain small dispersions of mineral oil, typically 2 to 30 percent, in a water-dilutable concentrate. The remaining portion of a semi synthetic concentrate consists mainly of emulsifiers and water. Wetting agents, corrosion inhibitors and biocide additives are also present. Semi synthetics are often referred to as chemical emulsions or preformed chemical emulsions since the concentrate already contains water and the emulsification of oil and water occurs during its production [12]. 2.2 Methods 2.2.1 Preparation of composites The batch was made from Styrene-butadiene rubber which mixing with the addition of some of the materials given in Table 1. Polyvinyl chloride was added with 0,5,10,15,20, and 25 pphr. Samples of compression strength were Preparing according to ASTM D 1229 specifications. 2.2.2 Compression test Compression strength was defined by using compression instrument shown in Figure 3. In this

test, a (1000pa) pressure was projected for 72 hours on cylindrical samples after calculating the

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value of the diameter and height for each primary sample. And so, allowing the sample to settle for

half an hour and get dimensions after shedding load in order to draw out a longitudinal line.

Table 1. The materials weight fraction% in the master batch

Compounding ingredients pphr

SBR 100

PVC 0-25

Carbon black 0-40

Zinc oxide 3

Stearic acid 1

Dop 1

TMTD 1.5

Antioxidant 1.5

Sulfur 1.5

Figure 3. Compression instrument

3.RESULTS AND DISCUSSION

Figures 4, 5,6,7 and 8 shows the relation between the compression strength of rubber composite

and the immersion period in Semi synthetics (30% petroleum oil) as a function to PVC additions.

Equally we understand from the numbers, the rubber composite is having higher compression

strength property than pure rubber, where compression strength will increase with increasing PVC

pphr ,because the thermoplastic polymers subjected to a permanent deformation higher than

elastic deformation after removing the load, it is opposite of an elastomeric materials. But after

immersion in oil, compression strength will decrease with exponential relation during the

immersion period in the oil, because of the penetration of oil particles which increase the covering

between the primary chains and make the weakening in secondary forces of (Vander walls) and

traversing so that the Brownian motion of molecular chains will increase. Figure 9 represent a

comparison of all the curves.

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Figure 4. Compression strength of rubber composite before immersion in oil

Figure 5. Compression strength vs. 1 week immersion in oil

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Figure 6. Compression strength vs. 2 weeks immersion in oil


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Figure 9. A comparison of all the curves

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4. CONCLUSION

The compression strength of rubber will enhance by adding PVC and continue increasing with

increasing PVC pphr additions, because of the thermoplastics show a permanent deformation

higher than elastic deformation. The compression strength of rubber composite before immersion

better than for blend after immersion in oil, where the compression strength will decrease with

each immersion period, because of the penetration of oil molecules which increase the crossing

between the principal chains of rubber composite.

References

1. Al-Mosawi, Ali I. (2013). METALS MANUFACTURING PROCESSES. 2nd edition ,

Redwan publisher, ISBN: 978-9957-76-113-1.

2. Al-Mosawi, Ali I. and Al-Maamori, Mohammed H. (2013). RUBBER TECHNOLOGY:

EXPERIMENTAL STUDIES. LAP LAMBERT Academic Publishing , ISBN: 5-39310 -

659-3-978.

3. Al-Mosawi, Ali I. ,Al-Maamori, Mohammed H. , and Yasser Haider A. (2014).

MECHANICAL PROPERTIES OF ACRYLONITRILE-BUTADIENE RUBBER

REINFORCED BY POLYVINYL CHLORIDE PARTICLES. Proceedings of 1st national

conference for engineering , engineering college, university of Mustansiriyah, Iraq ,

March 26-27 ,pp.231-235.

4. Yasser Haider A. ,Al-Maamori Mohammed H., and Al-Mosawi Ali I. (2014). EFFECTS

OF POLYVINYL CHLORIDE ADDITION ON SWELLING RESISTANCE OF

NITRIL RUBBER. Research Journal of Recent Sciences , 3(ISC-2013), pp.209-211.

5. Komalan, C., George K. E., Kumar P. A. S., Varughese K. T., Thomas S. (2007). DYNAMIC MECHANICAL ANALYSIS OF BINARY AND TERNARY POLYMER BLENDS BASED ON NYLON COPOLYMER/ EPDM RUBBER AND EPM GRAFTED MALEIC ANHYDRIDE COMPATIBILIZER. eXPRESS Polymer Letters,1(10),pp. 641–653.

6. Guo, Rui. (2009). IMPROVED PROPERTIES OF DISSIMILAR RUBBER-RUBBER BLENDS USING PLASMA POLYMER ENCAPSULATED CURATIVES. Ph.D. thesis, University of Twente, Enschede, the Netherlands.

7. Al-Mosawi, Ali I. (2012). COMPOSITE MATERIALS: THEORETICAL AND

EXPERIMENTAL APPROACH. LAP LAMBERT Academic Publishing, ISBN: 5-

27625-659-3 -978.

8. Al-Maamori, Mohammed H. , Al-Mosawi, Ali I. ,and Yasser Haider A. (2014).

MECHANICAL BEHAVIOR OF NBR-PVC MIXTURE AFTER IMMERSION IN

DIFFERENT MEDIA, International journal of advanced research in engineering and

technology (IJARET), 5(6),pp.34-39.

9. Al-Mosawi, Ali I. (2012). PROPERTIES OF COMPOSITE MATERIALS DATABOOK

,LAP LAMBERT Academic Publishing, ISBN: 3-24295 -659-3-978.

10. Imgarcade .(2013). STYRENE BUTADIENE RUBBER. Polyacrylonitrile Molecule.

11. EON Reality. (2012). POLYVINYL CHLORIDE. Irvine, CA 92618.

12. Iowa waste reduction center.(2003). CUTTING FLUID MANAGEMENT FOR SMALL MACHINING OPERATIONS.3rd edition, University of Northern Iowa.