High thermal stability pellet composition for thermal cut-off device, preparation method and use thereof
A technology of cut-off device and composition, applied in thermal switches, organic material conductors, heating/cooling contact switches, etc., can solve problems such as no reset
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[0052] The preparation of fumed silica is usually as follows: silicon tetrachloride is introduced into an oxygen-enriched hydrocarbon flame, thereby generating fumed silica. Fumed silica (also called fumed silica) is silica in the form of fine particles and is usually formed by exposing silicon tetrachloride to flames or other heat sources in the presence of oxygen to form multiple tiny amorphous Silica particles. In certain variations, the average particle size of the fumed silica particles may be less than or equal to about 100 nm, optionally greater than or equal to about 5 nm and less than or equal to about 50 nm, as shown in the non-limiting examples. In some variants, particularly suitable fumed silica has an average particle size of about 5 nm to about 30 nm, and a BET surface area of 100 to 300 m² / g, which is available from Wacker Silicones as the product HDK TM N20 is commercially available.
[0053] In other variations, the one or more inorganic stability additive ...
Embodiment 1
[0077] According to various aspects of the present invention, the inorganic stability additive particles including talc and fumed silica exhibit substantial dielectric properties (having a maximum dielectric capability temperature (T) greater than or equal to 380°C cap )) The pellet material composition used in TCO is formed as follows. By mixing about 980g (95.6%±0.5%) of 2',6'-dimethylacetanilide (commercially available from Sigma-Aldrich, purity 97%); about 10g fumed silica (0.98%±0.5%) (HDK commercially available from Wacker Silicones TM N20) and 10g of talc (0.98%±0.5%) (commercially available Johnson’s Baby Powder) are mixed with about 25g of colorant, binder and or release agent (2.4%±0.5%) to form pellets. The mixture is then screened and folded by hand, and then processed with a standard powder compression press (available widely from pharmaceutical equipment suppliers). After being processed in a compression press, the powder is fed through a gated powder flow contr...
Embodiment 2
[0083] The materials described in Table 2 below were used to prepare various pellet material compositions for TCO as described in Example 1 above. A certain number of pellet samples of each pellet composition in Table 2 are compared with the same or similar number of pellet compositions without specific inorganic additives to provide the following effects. Some potential inorganic additives seem to provide unexpected beneficial and positive effects, while other additives lead to different negative results. These results are shown in Table 2 below. In addition, it should be noted that for each given pellet composition (for a comparative composition with the same composition but without inorganic stability additives) a conventional comparative maximum rated temperature (T max ), although the actual maximum dielectric capacity temperature (T cap ) Has not been tested in these examples.
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[0086] Examples A-J show that the test results are positive and thus benefic...
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