Page 75 - 《橡塑技术与装备》英文版2026年2期

MATERIALS AND FORMULATIONS

1.1 Main raw materials and auxiliaries The entire process utilizes an open mill for supplementary
Natural Rubber (NR), MTR20, a Malaysian product; mixing, cooling, and collection.
BR9000, a product of Qilu Petrochemical Company; Carbon The test rubber compound is mixed using a tandem
Black N234, a product of Jiangxi Black Cat Carbon Black mixer GK320 for the first stage of masterbatch mixing, with
Co., Ltd.; White Carbon Black 1115MP, a product of Qingdao processing aids such as PP and other minor ingredients added
Yinlide Company; Processing Aid PP, a product of Qingdao together. After the first stage of mixing, it is directly mixed
Rhine Chemical Company; Environmentally Friendly Oil in the F270 mixer. The entire process is supplemented with
V700, a product of Hansheng Company; and others are mixing, cooling, and collection using an open mill.
commonly used raw materials in the tire industry. 1.5 Performance testing
1.2 Recipe The performance tests of rubber compound and finished
The experimental formula is presented in table 1. tires are conducted in accordance with corresponding national
Table 1 Small-scale Coordination Test Plan standards or enterprise standards. The extrusion temperature is
Component Normal Experiment randomly measured using a needle thermometer, and the tread
NR+BR9000 100 100
N234+1115MP 62 62 size and thickness are measured offline.
V700 5 5
Processing aid PP 0 2.5
The remaining components are the same 2 Results and discussion
2.1 Processing aid PP
1.3 Main equipment and instruments The indicators for Rhine processing aids are shown in
X(S)M-1.5 small mixer, XK-160 open mill, and XLB- table 2.
400-400 four-column flat curing press, products of Qingdao Table 2 Technical indicators of processing aid PP
Kegao Rubber and Plastic Machinery Technology and Name Unit Numerical value Indicator range
Ash content (900±25℃) % 12.05 12~13
Equipment Co., Ltd.; MV3000 Mooney viscometer, product of melting point ℃ 102.1 98~106
Montech Company in Germany; Zwick Z3130 hardness tester
and Zwick Z010 tensile testing machine, products of Zwick 2.2 Comparison of rubber compound
Company in Germany; Rubber Processing Analyzer RPA2000, properties
product of ALPHA Company. 2.2.1 Small coordination test
1.4 Sample preparation The small compounding scheme is shown in table 1. Both
The small compounding test rubber compound is mixed the normal rubber compound and the test rubber compound
in two stages. The first stage is conducted in an X(S)M-1.5X adopt a process where a segment of masterbatch is mixed and
type internal mixer, with the feeding sequence being: raw then directly subjected to final mixing and vulcanization. The
rubber → small materials such as carbon black and stearic acid performance is shown in table 3.
→ oil addition at 110 ℃ → two extrusions at intermediate Table 3 Comparison of vulcanization characteristics of
temperatures of 115 ℃ and 130 ℃ → rubber discharge at small compounds
Project Normal Experiment
155 ℃, and the sheet is placed under the mixer for 4.5 hours. Mooney viscosity [M L (1+4)100 ℃] 64 58
The second stage is conducted in an XK-160 type open mill, Mooney scorch time t 5 (127 ℃/min) 15 14
F L (dN.m) 2.5 2.1
with the feeding sequence being: the first stage mixed rubber F max (dN.m) 17.9 17.9
compound → sulfur, etc. → add rubber sheet. t 10 /min 4.5 4.1
t 50 /min 6.0 5.6
Normal rubber compound mixing involves a first stage of t 90 /min 10.4 9.3
masterbatch mixing using the tandem mixer GK320, followed
by a pressure-free supplementary mixing in the lower mixer. As shown in table 3, after adding the processing aid PP,
The second stage employs the F370 for the return mixing compared to the normal rubber compound, the FL and Mooney
process, and the final mixing is carried out in the F270 mixer. viscosity of the test rubber compound were significantly

Vol.52，2026 ·31·