02 Adul.ppt - Rubber Boardclinic.rubberboard.org.in/PDF/ircpdf/RT-02 Adul.pdf · formula that shown...
Transcript of 02 Adul.ppt - Rubber Boardclinic.rubberboard.org.in/PDF/ircpdf/RT-02 Adul.pdf · formula that shown...
01-11-2012
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Preparation and Property of the Epoxidized Natural Rubber from
Field Latex
BY
Mr. Adul Na Wichian
Introduction
H C
H C
CCH
3
2 H C2 2H C2
3
CHC
H C
H C
2H C2
3
CHC
H C
H C RCOOOH
H C
H C
CCH
3
2 H C2
O
OH
CO
R
H C
H C
CCH
3
2 H C2
H C
H C
CCH
3
2 H C22H C2
3
CHC
H C
H C O
+RCOOH
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Material and Method
Preparation of Epoxized Natural Rubber
Field Latex 2,890 g
Add terric 16 A 16 of 225 g at 50 OC, 30 min.
Add formic acid of 537 g, 60 min.
Dilute to 20 % DRC
Add H2O2 of 2,259 g, 180 min.
25 % mole ENR 50 % mole ENR
60 min. 360 min.
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Preparation of Epoxized Natural Rubber
25 % mole ENR 50 % mole ENR
Add methanol to coagulate latex
Make sheet with two-roll-mill
Washed with water and 5% Na2CO3, and dry at 60-70OC, 24 Hr.
FT-IR and property
Preparation of compound rubber
• Grind and mix rubber with chemicals as formula that shown in Table 1 by using two‐roll‐mill machine, after that store the compound rubber at the room temperature for 24 hours.
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Table 1 the formula of rubber and chemical that modify the catalyst
Formula 1 2 3 4 5 6
STR 5L 100 100 ‐ ‐ ‐ ‐
ENR‐25
‐ ‐ 100 100 ‐ ‐
ENR‐50
‐ ‐ ‐ ‐ 100 100
ZnO 0.5 0.5 0.5 0.5 0.5 0.5
Stea A 6.0 6.0 6.0 6.0 6.0 6.0
S 3.5 3.5 3.5 3.5 3.5 3.5
MBTS 0.5 ‐ 0.5 ‐ 0.5 ‐
CBS ‐ 0.5 ‐ 0.5 ‐ 0.5
Characterization
• Lead compound to test with ODR 2000 machine (Tech Pro) as the standard method of ASTM D 2048‐95, by set the temperature at 150 0C and set the metal plate with 3 degree angle to find out the scorch time and to find out the cure time of rubber . Tensile strength of vulcanized rubber were determined as
ASTM D 412 (die c).
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• Oil resistant were determined by use ASTM No.1 and IRM 903 oil at temperature 100 0C for 22 hours and then measured the volume that had been changed.
Results and discussion
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Figure 1 the quantity of percent mol epoxide at the different reaction time
Figure 2 the infrared spectrum of the epoxide natural rubber 25 percent mol (ENR‐25)
-10
10
30
50
70
90
110
130
650115016502150265031503650wave number (cm-1)
% T
1.447 892 cm- 836 cm-
2,932
3.457 cm-
2,726 cm-1 1.248 cm-
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Figure 3 the infrared spectrum of the epoxide natural rubber 50 percent mol (ENR‐50)
-10
10
30
50
70
90
110
650115016502150265031503650
wave number (cm-1)
% T
2,933 cm-
1
3,443
2,726 cm-
1,251
896 cm- 836 cm-11,455 cm-1
Figure 4 the scorch time of STR 5L, ENR‐25 and ENR‐50 that change the type of catalysts
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Figure 5 the cure time of STR 5L, ENR‐25 and ENR‐50 that change the type of catalysts
Figure 6 the tensile strength of STR 5L, ENR‐25 and ENR‐50 that change the type of catalysts before ageing
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Figure 7 the tensile strength of STR 5L, ENR‐25 and ENR‐50 that change the type of catalysts after ageing
Figure 8 the oil resistant property to ASTM No.1 oil of STR 5L, ENR‐25 and ENR‐50 that change the type of catalysts
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Figure 9 the oil resistant property to IRM 906 oil of STR 5L, ENR‐25 and ENR‐50 that change the type of catalysts
Summary
The epoxidized natural rubber which prepared from field latex for 60 and 360 minutes will have group of epoxide equal 25 and 50 percent mol; and the scorch time and cure time will be less than natural rubber when use CBS to be catalyst. In addition, the natural rubber has a more tensile strength than the epoxidizednatural rubber. After ageing the epoxidized natural rubber has changed the tensile strength less than the natural rubber in both case of using MBTS and CBS to be catalyst and there are better in an oil resistant property.
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Thank you
for attention