Unlock instant, AI-driven research and patent intelligence for your innovation.

A Method for Discriminating Hydrophobicity of Silicone Rubber Based on Initial Hydrophobicity Angle and Surface Energy Test

A discrimination method and technology of hydrophobic angle, which can be used in measuring devices, instruments, scientific instruments, etc., can solve the problems of difficult adsorption of water droplets, difficult and limited testing, etc., so as to reduce the hydrophobic angle, reduce test errors, and improve test results. The effect of precision

Active Publication Date: 2020-12-15
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the hydrophobic angle of the common silicone rubber is about 120°, which is close to the test limit of the hydrophobic angle. Therefore, the simple use of the hydrophobic angle to express the surface energy has been limited.
In addition, when the hydrophobicity of the sample is particularly good, it will be difficult for water droplets to adsorb to the surface of the sample when the hydrophobic angle is tested by the CA method, which will bring difficulties to the test

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Method for Discriminating Hydrophobicity of Silicone Rubber Based on Initial Hydrophobicity Angle and Surface Energy Test
  • A Method for Discriminating Hydrophobicity of Silicone Rubber Based on Initial Hydrophobicity Angle and Surface Energy Test
  • A Method for Discriminating Hydrophobicity of Silicone Rubber Based on Initial Hydrophobicity Angle and Surface Energy Test

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0050] A certain RTV paint sample (denoted as RTV-1), after sample preparation and pretreatment, and testing the static hydrophobic angle of the sample, make a preliminary judgment on the hydrophobicity of the sample: θ av水 av乙二醇 = 95.6. by theta av水 and θ av乙二醇 Using the WORK method to calculate the surface energy, it can be seen that the surface energy is 21.3mJ / m 2 . As shown in Table 2 below.

[0051] Table 2. RTV-1 test results

[0052] θ av水

experiment example 2

[0054] A certain RTV paint sample (denoted as RTV-2), after sample preparation and pretreatment, and testing the static hydrophobic angle of the sample, make a preliminary judgment on the hydrophobicity of the sample: θ av水 >120, the sample has excellent hydrophobicity.

[0055] Therefore, a supplementary test is carried out: replace the test solution with glycerin, test the static hydrophobic angle of the sample, and record the test data as the minimum value θ min丙三醇 and mean θ av丙三醇 . test theta av丙三醇 = 117.3.

[0056] Continue to test the hydrophobic angle θ of the sample under the condition of ethylene glycol av乙二醇 = 106.1.

[0057] When calculating the surface energy, pass θ av丙三醇 and θ av乙二醇 It can be seen that the surface energy is 18.42mJ / m 2 . As shown in Table 3 below.

[0058] Table 3. RTV-2 test results

[0059] θ av水

[0060] Comparing the detection and calculation results of the prior art method: according to the existing method, only θ ...

experiment example 3

[0062] For a certain RTV paint sample (referred to as RTV-3), test the hydrophobic angle under water conditions and the hydrophobic angle under ethylene glycol conditions. When testing the hydrophobic angle under water conditions, due to the excellent hydrophobicity of the sample, water droplets cannot drip onto the surface of the sample, so θ cannot be measured av水 . Hydrophobic angle of additional test sample under glycerol condition, θ av丙三醇 = 125.3.

[0063] Continue to test the hydrophobic angle θ of the sample under the condition of ethylene glycol av乙二醇 = 115.4.

[0064] by theta av丙三醇 and θ av乙二醇 Calculate the surface energy of the sample, which is 13.31mJ / m 2 .

[0065] The data are shown in Table 4 below.

[0066] Table 4. RTV-2 test results

[0067] θ av水

θ av乙二醇

θ av丙三醇

surface energy RTV-3 - 115.4 125.3 13.31mJ / m 2

[0068] In summary, the method of the present invention classifies the hydrophobicity of the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
surface energyaaaaaaaaaa
surface energyaaaaaaaaaa
Login to View More

Abstract

The invention provides a silicone rubber hydrophobic property discrimination method based on an initial hydrophobic angle and surface energy test. The method comprises the following steps: firstly testing a static hydrophobic angle of a sample by using deionized water, and classifying the hydrophobic property of the sample according to a test value: when the sample has the hydrophobic property, further determining the better hydrophobic property or excellent hydrophobic property of the sample; when the sample has the excellent hydrophobic property, performing the supplementary test: replacinga test solution with glycerol, testing the static hydrophobic angle of the sample, and recording the test data; and finally, for the sample with better hydrophobic property and excellent hydrophobic property, continuing the test of the static hydrophobic angle of the sample under the ethylene glycol condition, and recording the test data. An OWRK method is used for performing the surface energy calculation to obtain the surface energy of the sample. By adopting the method, the nonlinear change situation of the hydrophobic angle and hydrophobic property when the hydrophobic angle is large can be solved, and the sample can be more intuitively judged. The test accuracy can be improved. The problem that the ultra-hydrophobic material cannot be tested by using the traditional hydrophobic angletest method can be solved.

Description

technical field [0001] The invention belongs to the field of testing the hydrophobicity of insulating materials, and in particular relates to a method for discriminating the hydrophobicity of silicone rubber based on initial hydrophobic angle and surface energy testing. Background technique [0002] Silicone rubber materials are widely used in power transmission and transformation equipment due to their good hydrophobicity and hydrophobic migration characteristics. At present, the commonly used hydrophobicity discrimination methods mainly include the hydrophobicity grading method (HC method) and the static hydrophobicity angle test method (CA method). The HC method is easy to operate, but requires testers to have more operating experience. The CA method is used in the laboratory to accurately test the hydrophobic angle of the silicone rubber sample, and is the main method for judging the hydrophobicity. [0003] The hydrophobicity of silicone rubber comes from its low surf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/44
CPCG01N33/445
Inventor 张洋刘辉贾然周超刘传彬马国庆刘嵘段玉兵张皓杨波孙晓斌黄振宁杨军秦佳峰尹建光史方芳王玥娇
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY