Page 83 - 《橡塑技术与装备》英文版2026年3期

PROCESS AND EQUIPMENTS

apply vacuum, and turn on the heating device. Once the Table 3 Orthogonal experiment test results
temperature reaches 110℃, start timing and stir for 3.5 hours. Experiment number Tensile strength / MPa Extrusion rate / (mL·min⁻¹)
1 2.65 25.4
After the stirring time is up, let it stand and cool down. When 2 2.50 35.2
the temperature returns to room temperature, the base material 3 2.30 52.6
4 2.62 61.2
is obtained. 5 2.51 66.4
6 2.62 56.8
Add a certain amount of the aforementioned base 7 2.60 78.6
material and color paste to the experimental power mixer, stir 8 2.63 68.2
9 2.59 61.4
for 5 minutes, and then add the crosslinking agent. Turn on the
vacuum pump to evacuate the air and continue stirring for 20
Table 4 calculates the influence weight of each factor on
minutes. Finally, add the catalyst, evacuate and stir for another
the tensile strength and consistency of the adhesive sample
20 minutes, and then discharge the mixture. Place the resulting
through the range value. The calculation formula is:
paste into a 300 mL glue bottle for later use.
1.4 Test method ω i = n R i （1）
Σ j = 1 R j
1.4.1 Tensile strength and elongation at break R j —represents the range value of the ith indicator.
Sample preparation and curing were conducted according Table 4 Analysis of orthogonal experimental data
to GB/T528-2009. The samples were individually subjected 107 silicone rubber Mixed nano-calcium Silicone oil (C)
(A) (B)
to tensile testing using a dual-servo universal material testing Tensile strength
k1 2.48 2.62 2.63
machine, and the force required during the tensile process and
k2 2.58 2.55 2.57
the elongation at break were recorded. k3 2.61 2.50 2.47
0.12
1.4.2 Extrudability r 0.12 Extrudability 0.16
The test temperature for the sample is (23±3℃), the k1 37.73 55.07 50.14
k2 61.46 56.59 52.60
diameter of the base hole is 4 mm, and the pressure is set at 0.3 k3 69.40 56.94 65.85
MPa. The volume of extruded silicone rubber is measured for r 31.67 1.87 15.72
ωi
10 seconds, and the test is conducted three times to obtain an Tensile strength 30.33% 29.51% 40.16%
average value. Extrudability 64.29% 3.80% 31.91%
1.4.3 Surface drying time Under the requirements of superior tensile strength and
Referring to the GB/T13477.5-2017 standard, under a
glue application environment of (25±2)℃ and (55±5)%RH, good extrudability, the optimal formula for silicone adhesive
is A3B2C1. In terms of tensile strength, the range (R) of
squeeze the glue onto a clean tin foil paper and start timing.
silicone oil is the largest compared to the other two factors,
Gently touch the surface of the glue strip with the end of your
indicating that the addition amount of silicone oil has the
finger, and record the time it takes for the glue surface to
greatest impact on tensile strength, with an impact weight of
become non-sticky.
40.16%. According to the range values in the table, the order of
1.4.4 Curing depth influence of the three factors on tensile strength is: silicone oil
The maximum depth of vulcanization after testing the
> 107 silicone rubber > mixed nano-calcium. Similarly, based
sample for 24 hours using a vulcanization depth plate under
on the analysis of the range values of extrudability, the order of
conditions of (23±2)℃ and (50±5)% relative humidity is
influence of the three factors is 107 silicone rubber > silicone
measured.
oil > mixed nano-calcium, with 107 silicone rubber having the
greatest impact weight, reaching 64.29%.
2 Experimental results and analysis Based on the experimental data and analysis above, it can
2.1 Analysis of test results be concluded that the content of silicone oil has a significant
The test results of the orthogonal experiment are
and negative impact on the tensile strength of silicone rubber.
presented in table 3.

Vol.52，2026 ·37·