Question 1
What is the "oil" and "volatilization" of heat conducting gasket?
The silicone heat conducting gasket will "secrete" greasy substances on the surface of radiator or substrate in the use process, which is called "oil emission phenomenon".
The heat conduction gasket must be accompanied by the process of high temperature heating in the use process. The VOC (organic volatiles) release caused by the heating process is called "volatilization".
Question 2
What are the hazards of "oil emission" and "volatilization"?
Because this kind of heat-conducting material is mostly used in sophisticated electronic and electrical products, once such problems occur, common hazards are as follows:
1. Harm to people
Most of the volatiles from the silicone gasket are dimethylcyclosiloxane (DMC), generally d3-d10. In the latest 2018 reach hazardous substances catalogue, D4, d5 and D6 have been identified as suspected carcinogens, so these substances need to be strictly controlled below 1000ppm.
2. Pollution to equipment and products, difficult to clean;
3. Due to the "oil emission", the electrical performance is reduced, such as the surface resistance and breakdown voltage;
4. It will reduce the light transmittance of optical equipment and seriously corrode the light transmittance substrate;
5. Impurities and particles around may be adsorbed or adhered to the oil seepage, which may pose a potential threat to the operation and service life of the instrument and equipment.
Question three
What causes "oil emission" and "volatilization"?
The silicone heat conducting gasket is a composite material, which is prepared by mixing the silicone elastomer with high elasticity and the heat conducting filler with high heat conducting performance. So the main influencing factors are as follows:
1. The crosslinking degree of organic silica gel is insufficient, and there are free unreacted vinyl silicone oil, which will migrate to the gasket surface when the viscosity is reduced at high temperature.
2. Too much hydrogen containing silicone oil (including side hydrogen and end hydrogen) causes "oil emission" and "volatilization" due to excessive reaction.
3. Some methyl silicone oil without active group is added in the production, and even white oil is used as plasticizer to cause oil emission. This problem is often caused by the adulteration of black center suppliers.
4. Vinyl silicone oil or hydrogen containing silicone oil itself has too high volatile matter, and its main component is d3-d10. If it is kept in high temperature for a long time, small molecules will slowly release suspected carcinogens.
5. Residual organic matter in the process of powder treatment by powder manufacturer.
Question 4
How to solve these problems?
1. "Oil emission" problem
(1) Plasticizers without active groups such as dimethylsilicone oil and white oil cannot be added artificially;
(2) Try to use vinyl silicone oil and hydrogen silicone oil with low volatile content, and do not use "three no" products;
(3) Perfect the formula, control the proportion of cross-linking agent, do not seriously inadequate, do not seriously excessive.
(4) Vinyl terminated silicone oil
2. "Volatilization" problem
(1) The content of d3-d10 was controlled and the volatile matter was reduced by using low ring silicon oil;
(2) Perfect the formula, control the proportion of cross-linking agent, do not seriously inadequate, do not seriously excessive.
(3) The powder should be selected from the factories with low volatility.
The product line of Abia special silicone involves various types of silicone oil. In view of the oil production problems of customers, the volatile content of the silicone oil with single vinyl end sealing and the vinyl silicone oil with ultra-low volatile content is less than 500ppm. In this respect, it is the industry leader and meets your indicators in various high-end applications. We are looking forward to win-win cooperation with you.
Vinyl terminated silicone oil
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