Structure

Product Overview:

Methyl phenyl silicone rubber contains a large number of phenyl groups on its raw rubber molecules. In addition to the high temperature resistance and dielectric properties commonly found in methyl vinyl silicone rubber, it also has better radiation resistance, ablation resistance, physical and mechanical properties, and excellent low-temperature performance. This product is insoluble in water, soluble in toluene, etc., and has excellent characteristics of small compression deformation and resistance to saturated vapor pressure.

Advantage:

It has a certain degree of flexibility at minus 110 ℃, and products produced as basic raw materials can be used well in ultra-low temperature working environments;

Long term storage stability;  

Has good damping performance;

Good radiation resistance effect;

High consistency, low volatility, no odor, excellent thermal stability.

Application 

In industries such as aviation, electronics, machinery, and chemical, low-temperature resistant sealing materials and waterproof and moisture-proof insulation materials can be manufactured;  

Due to its physiological inertia, it can be used for blood refrigeration sealing and medical tubing in the field of medicine and hygiene;

It can also be used to manufacture sealing materials, molded products, etc. with special properties such as radiation resistance, high temperature resistance, and erosion resistance.

Technical data

Color: colorless

Phenyl content (Ph/Si)%: 5-40

Molecular weight (Mw): 400,000 to 800,000

Specific gravity (25 ℃): 0.99-1.05

Volatile matter (150 ℃/3h)% ≤ 2

Properties 

The use of different structures of phenyl silicone gum will directly affect the performance of the final product, but for methyl phenyl vinyl silicone gum, the vinyl content, distribution, etc. will also greatly affect the physical and vulcanization properties of the vulcanized rubber; Different phenyl content greatly affects the low temperature resistance, damping performance, and radiation resistance of vulcanized rubber. 

 (1) Vinyl content

As the vinyl content in the silicone gum increases, the crosslinking ratio increases, and the hardness and tensile strength of the vulcanized rubber also increase accordingly, while the elongation and compression set decrease.  

（2）Position and distribution of vinyl groups

The performance of vulcanized silicone rubber obtained from vinyl terminated silicone gum is better than that obtained from non-vinyl terminated general grade silicone gum. This is because the end vinyl group has a molecular chain growth effect during crosslinking, thereby improving the physical and mechanical properties of the vulcanized silicone rubber. Our company uses D4 as raw material to produce silicone gum, and the distribution of vinyl raw rubber on the side chain is more uniform, thereby improving the cross-linking density and better rebound.

 (3) Phenyl content

The different phenyl content in silicone gum determines the functionality of phenyl silicone rubber. Low phenyl content silicone gum has the best low-temperature resistance, while medium phenyl content can significantly improve the damping performance of silicone rubber; High phenyl silicone rubber can significantly demonstrate the radiation resistance of silicone rubber.

Packaging and Storage 

25kg cardboard box (lined with plastic bag)

Store in unopened original packaging at temperatures below 40 ℃ for 24 months from the date of production