A Method for Discriminating the Hydrophobic Migration Characteristics of Silicone Rubber Based on Different Salt Components
A method of discrimination and hydrophobicity technology, which is applied in the field of discrimination of silicone rubber hydrophobicity migration characteristics, and can solve problems such as not being able to meet the operating environment
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Embodiment 1
[0047] Example 1. Migration Test and Discrimination of DC Grade C Pollution Silicone Rubber
[0048] The method of the present invention is used to simulate the direct current Class C pollution, to pollute the silicone rubber, and test the hydrophobicity. The test results are shown in Table 2 below.
[0049] Table 2. Migration test results of DC grade C dirty silicone rubber
[0050] Migration time (h) NaCl CaCl 2
(NH 4 ) 2 SO 4
24 5 96 120.9 21.4 114.8 144 126.5 28 122.2
[0051] According to the test results, first calculate the hydrophobic angle migration saturation value θ Na and θ NH4 .
[0052] For NaCl, there is θ Na-144h -θ Na-96h / θ Na-96h =(126.5-120.9) / 120.9=6.44%Na = θ Na-144h =126.5
[0053] For (NH 4 ) 2 SO 4 , with θ NH4-144h -θ NH4-96h / θ NH4-96h =(122.2-114.8) / 114.8=4.63%NH4 = θ NH4-144h =122.2
[0054] Next, calculate the 96h steady-state ratio of NaCl migration r Na and (NH 4 ) 2 SO 4 ...
Embodiment 2
[0063] Example 2. Migration test of DC grade D dirty silicone rubber
[0064] According to the same calculation method, the data of different silicone rubbers can be obtained. Table 4 lists two groups of direct current class D pollution migration data:
[0065] Table 4. Migration data of DC grade D dirty silicone rubber
[0066] θ Na
r Na
θ NH4
r NH4
θ NH4-96
θ Ca-24
θ Ca-96
RTV-1 112.1 0.933 112.3 0.92 103.3 4 17.1 RTV-2 119.4 0.944 113.9 0.934 106.4 7 20.5
[0067] Characterized by NaCl, θ Na1 =112.1, θ Na2 =119.4, the RTV-2 migration speed is faster, and the hydrophobicity is better when the migration is saturated; with (NH 4 ) 2 SO 4 Characterization, the migration speed of RTV-2 is faster, and the hydrophobicity of the two is equivalent when the migration is saturated; 2 Characterization, heavy CaCl 2 In polluted areas, the hydrophobicity of RTV-1 and RTV-2 decreased rapidly, and the hydro...
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