Page 73 - 《橡塑技术与装备》英文版2026年1月

MATERIALS AND FORMULATIONS

1 Experimental part Taiwan High Speed Rail Corporation, in accordance with GB/
1.1 Experimental raw materials T 528-2008. The tensile speed was 500 mm/min, and the test
EPDM 2650C, Arlanxeo; MVQ 9170 M, Elkem temperature was room temperature.
Silicones; ACM 121X, Jiujiang Dewei; EVM 700, Lanxess; 1.4.3 Aging resistance
NBR 1052, Zhenjiang Nadi; other additives are commonly The thermal-oxidative aging conditions are set at 120℃
used industrial products. for 72 hours.
1.2 Experimental formula 1.4.4 Wear resistance
Table 1 Experimental formula (in parts) The Shao Poer abrasion test method (with a load of 10 N)
serial number 1 # 2 # 3 # 4 # 5 # was employed.
ACM 121X 0 3 0 0 0
EVM 700 0 0 3 0 0
NBR 1052 0 0 0 3 0 2 Results and Discussion
KH-550 0 0 0 0 1.2
2.1 Vulcanization characteristic data
The vulcanization characteristic parameters of EPDM/
The experimental formula is shown in Table 1, with
MVQ blend rubber are shown in table 2. The scorch time t 10
all other compounding ingredients being the same (in parts):
of the five blend rubbers is relatively short, indicating poor
EPDM 2650C 70, MVQ 9170 M 46.2, silica 10, ZnO 5, SA 1,
processing safety. The process optimum vulcanization time t 90
DCP 2, TAIC 1.5, and antioxidant RD 1.5. of 4 blend rubber is the longest, and its vulcanization reaction
#
1.3 Sample preparation rate is slower compared to the other four blend rubbers.
Weigh various raw materials according to the recipe.
Table 2 Vulcanization characteristic parameters
Firstly, place EPDM on the open mill and add silica white in Vulcanization characteristic data/number 1 # 2 # 3 # 4 # 5 #
batches after the rollers are wrapped. Make 8 triangle packs M H /(dN·m) 22.14 22.27 22.83 21.33 22.88
M L /(dN·m) 0.88 0.94 0.96 0.89 1.36
and 5 rolls, then take it out for later use. Secondly, prepare t 10 /(min:s) 0:45 0:46 0:45 0:47 0:45
the modified MVQ by placing MVQ in the open mill and t 90 /(min:s) 6:30 6:29 6:24 8:45 6:50
wrapping the rollers. After that, add modifiers separately and
mix them evenly before taking them out. Then, mix the EPDM 2.2 Compatibility characterization
The results of water contact angle tests for MVQ,
masterbatch and modified silicone rubber, make 5 triangle modified MVQ, and EPDM are presented in Figure1, while
packs and 3 rolls, add small materials for mixing, and finally
the surface tension and interfacial thickness of the blends are
add the curing agent. Mix them evenly before taking them out
illustrated in Figure2. Compared to the water contact angle
and let them stand for 16 hours. Then, cure them on the flat
of pure MVQ, the contact angle of MVQ with modifiers such
vulcanizing press under the conditions of 170 ℃ ×10 MPa×t 90 .
as ACM, EVM, NBR, and KH-550 decreases, indicating
1.4 Analysis and testing improved wettability. The factors affecting the surface contact
1.4.1 Compatibility characterization angle are also related to surface polarity . Specifically, the
Based on the calculation of the surface tension of presence of polar groups (ester groups, cyano groups) in MVQ
vulcanized rubber using the Owens two-liquid method (with with modifiers increases its surface tension. For KH-550, one
water and α-bromonaphthalene as the test liquids), and the end hydrolyzes to form a hydroxyl group and the other end
calculation of the interfacial thickness of blended vulcanized hydrolyzes to form an amino group under high temperature
rubber according to literature to characterize its compatibility, conditions , leading to a decrease in contact angle and an
a larger interfacial thickness of the blended rubber indicates increase in surface tension. Among them, the addition of NBR
better compatibility. significantly reduces the contact angle of MVQ. The addition
1.4.2 Mechanical properties of ACM, EVM, and KH-550 also reduces the contact angle of
The tensile properties were tested using an electronic MVQ, but the reduction is not as significant as that achieved
tensile testing machine of model I-7000S, manufactured by by adding NBR.

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