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Analysis of hardness testing of medical silicone rubber tube
Medical silicone tube in the hardness of the test, directly on the raw material cut two small pieces down, and then together with the sulfide. The results were found to thin
The hardness is lower than the thickness of the 4 values. What is the cause?
The hardness of medical silicone rubber tube is related to the structure of carbon black and rubber.
Lead to local stress concentration similar to crystallization. This is a very normal thing, once again when the thin, the chain was interrupted again, while increasing the glue
It is not surprising that the low 2,3 level is not surprising.
Why does the change of hardness is small? The molecular chains are broken and dispersed well in the influence of the hardness? Natural rubber thin will be made
Molecular chain rupture, lower hardness. Long time to use the machine to open the chain, the natural rubber will be turned off. Molecular strand breaks, crystallization properties
Reduce. Molecular chain exercise leads to lower hardness.
Medical silicone tube with high hardness formula the phenomenon more obvious may is because of the high hardness formula, by the properties of raw rubber and filler effect,
The movement ability between the rubber chains other components of poor, vulnerable to long relaxation time, shear leads to broken chain.
In short, the hardness test of medical silicone rubber hose is quite normal, and it is the problem of plasticity.
The NR/CR high Mooney must rely on mechanical shear to lower molecular weight, Mooney viscosity reached a certain, very likely not in front of the sample
Reached the degree of plasticity, so the large molecular weight, of course Mooney viscosity decreases and then will increase all of a complexing agent solubility, divided into
Loose so the hardness will change.
This paper is from Shenzhen,, id=575?
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