[Details]What is the constant tensile stress and
What is the 'constant extension stress' of the O-type hydraulic seal '? First of all, we need to know that the Hydraulic seal (Hydraulic seal) is a widely used sealing ring in chemical and industrial fields, which prevents the working medium from leaking along the shaft to the outside of the shell and the external dust from invading the inside of the body in reverse.
Then, the Dongsheng seal tells you that the stress at definite elongation refers to the load on the unit cross-sectional area required for the rubber product sample to stretch to a given length, is the material index of rubber seal products (standard items ).
First, in the engineering environment, what are the 'constant stress' Factors affecting the hydraulic seal?
1.1 The larger the molecular weight of rubber, the greater the constant stress;
1.2 rubber has a large interaction force between molecules and a high tensile force;
1.3 The blending of rubber and plastic materials can improve the tensile stress and hardness;
1.4 if the molecular weight distribution is narrow, the tensile stress and hardness decrease;
1.5 The tensile stress and hardness decrease with the increase of the dosage of the agent;
1.6 The tensile stress and hardness increase with the increase of cross-linking density.The traditional vulcanization system can obtain high tensile stress and hardness.
1.7 The tensile stress and hardness increase with the decrease of filler particle size, increase with the increase of structure degree and surface, and increase with the increase of filler dosage.
It can be seen that the common tensile stress has a constant tensile stress of 100, 200, 300 and 500. If the sample with a cross-sectional area of 1 cm² is lengthened by one time and needs a load of 490N (50 kilograms of force), the 100 constant tensile stress is 490 Pa (50 kilograms of Force/c ㎡ ).
Two, what are the tensile strength factors that affect the hydraulic seal specification material?
2.1 The tensile strength of rubber with small molecular weight increases with the increase of molecular weight;
2.2 The tensile strength of rubber with narrow molecular weight distribution is higher;
2.3 The tensile strength increases with the increase of the degree of crystalline rubber;
2.4 Polar state on the main chain, the tensile strength increases with the increase of the force between molecules;
2.5 After the orientation of the rubber molecular chain, the tensile strength in the parallel direction increases, and the tensile strength in the vertical direction decreases;
2.6 The tensile strength decreases with the increase of cross-linking bond energy, and the peak occurs with the increase of cross-linking density;
2.7 There are many oxygen-containing groups on the surface of the hydraulic seal material, and its tensile strength, tear strength and elongation are high;
2.8 The particles of the filler are small, the surface is large, the surface is large, the fruit is good, and the tensile strength can also be improved by material blending;
2.When the dosage of 9 doses exceeds 5 parts, the tensile strength of the vulcanization glue will be reduced;
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