Page 76 - 《橡塑技术与装备》英文版2026年2期

HINA R&P TECHNOLOGY AND EQUIPMENT

reduced, while Fmax remained the same, and the vulcanization the Mooney viscosity of the test first-stage masterbatch is about
rate was slightly faster. The above results indicate that adding 10 units lower than that of the normal first-stage masterbatch,
the processing aid to the rubber compound can significantly and about 10 units higher than that of the normal second-
reduce its Mooney viscosity and improve processing stage masterbatch. In terms of the final rubber compound,
performance while maintaining its original vulcanization the Mooney viscosity of the test final rubber is only 2.5 units
characteristics. higher than that of the normal final rubber.
Table 4 Physical properties of vulcanized rubber 2.3.2 Vulcanization characteristics of rubber
(vulcanization conditions: 150 ℃ ×40 min) compound
Project Normal Experiment
Shore A hardness/degree 64 64 As shown in table 6, compared to the normal formula, the
100% modulus at fixed extension/MPa 2.71 2.72 test formula has a Mooney viscosity 3.4 higher and a slightly
300% modulus/MPa 12.67 11.38
Tensile strength / MPa 26.51 25.51 shorter scorch time, but the vulcanization rate is similar.
Elongation at break, % 507 499 Table 6 Comparison of vulcanization characteristics of
Permanent deformation after breakage/ % 18 16
-1
Tear strength/(kN·m ) 54 56 rubber compounds (conditions: 150 ℃ ×40 min)
Resilience /% 49 52 Project Normal Experiment
Compression fatigue temperature rise/ ℃ 20.7 21.2 Mooney viscosity [M L (1+4)100℃] 58.2 61.6
Compression set / % 3.5 3.7 Mooney scorch time t 5 (127℃)/min 20.5 19.7
Akron abrasion/ (cm /1.61 km) 0.145 0.136 F L (dN·m) 2.3 2.5
-3
Carbon black dispersion grade 7 7 F max (dN·m) 18.4 19
Density/(kg·dm ) 1.108 1.108 t 10 /min 6.2 5.9
-3
t 50 /min 7.8 7.8
t 90 /min 13 13.7
As shown in table 4: The hardness of normal rubber
compound and test rubber compound is the same. The test 2.3.3 Physical properties
rubber compound has slightly lower modulus and tensile As shown in table 7, the hardness of the test rubber
strength than the normal rubber compound, but its Akron compound after segment reduction is consistent with that
abrasion resistance, tear resistance, and rebound elasticity are of the normal rubber compound, and its tensile strength and
slightly better. Overall, the performance of the two is similar. elongation are similar to those of the normal rubber compound.
In summary, the addition of processing aids can The elongation rate is slightly lower than that of the normal
effectively reduce the Mooney viscosity of the rubber rubber compound due to the reduction of one segment of
compound while maintaining its original properties, thereby return mixing. The carbon black dispersion of the test rubber
improving its processing performance. compound is one grade lower than that of the normal rubber
2.3 Large material test compound, and its heat build-up is slightly higher, which may
2.3.1 Comparison of Mooney viscosity also be related to the deterioration of carbon black dispersion.
during production process The other properties are similar.
Produce 20 batches of normal rubber compound and Table 7 Physical properties of vulcanized rubber
test rubber compound respectively, and measure the Mooney (vulcanization conditions: 150 ℃ ×40 min)
viscosity of each stage of masterbatch and final compound. The project normal experiment
Shore A hardness/degree 65 65
average values are compared as shown in table 5. 100% modulus at fixed extension/MPa 2.68 2.75
300% modulus/MPa 13.42 13.72
Table 5 Comparison of Mooney viscosity at various Tensile strength / MPa 26.39 25.41
stages during the production process Elongation at break, % 500 477
Name Mooney viscosity Permanent deformation after breakage % 16 16
-1
A section of normal maternal glue 94.3 Tear strength / (kN·m ) 52 54
Normal second stage of mother rubber 73.5 Resilience /% 48 50
Test base rubber 84.1 Compression fatigue temperature rise (in ℃) 20.8 22.2
Normal final gel 60.0 Compression set/% 3.6 4.5
3
-3
Final gel test 62.5 Akron abrasion/ (cm ·1.61 km ) 0.146 0.135
Carbon black dispersion grade 7 7
-3
Density/(kg·dm ) 1.107 1.107
As shown in table 5: After adding the processing aid PP,
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