Thermally expandable graphite
A thermal expansion and thermal expansion technology, applied in inorganic chemistry, silicon compounds, chemical instruments and methods, etc., can solve problems such as difficulties and productivity difficulties
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Embodiment 1
[0109] 450 g of 98% by weight sulfuric acid (hereinafter referred to as "98% sulfuric acid") was put into a container with a capacity of 1 L, and the temperature of the sulfuric acid was cooled to 5° C. by cooling the container. 56.6g (248mmol, 12.6% (weight) of 98% sulfuric acid) of ammonium peroxodisulfate was dropped into the sulfuric acid, and then 60% (weight) of hydrogen peroxide (hereinafter referred to as "60% hydrogen peroxide) kept at room temperature was added. ”) 1.5 g (26.5 mmol). The ratio of hydrogen peroxide molar amount / peroxodisulfuric acid conversion molar amount was 11%. The container was also cooled during the feeding of these oxidizing agents, and a mixture having a temperature of 10° C. was obtained as a treatment liquid.
[0110] The particle size is less than 80 mesh (recorded as "-80" in Table 1), specifically 42% (weight) of 80~200 mesh, 28% (weight) of 200~320 mesh, and 30% (weight) of less than 320 mesh 75 g of natural flaky graphite was added wi...
Embodiment 2
[0113] The magnesium hydroxide 2.4g (being 8% (weight) of raw material graphite weight) that obtains heat-expandable graphite 30g average particle size by the manufacturing method identical with embodiment 1 is 5 ~ 10 μ m drops in the V-type mixer, mixes 10 Minutes later, 32.4 g of neutralized heat-expandable graphite was recovered. The pH of this heat-expandable graphite was 6.2.
Embodiment 3
[0115] Thermally expandable graphite was produced by the same production method as in Example 1, by changing the compounding amount of the oxidizing agent (Examples 3 and 4) or changing the particle size distribution of raw graphite (Example 5) as shown in Table 1.
[0116] At this time, ammonium peroxodisulfate charged in Example 3 was 45.0 g (197 mmol, 10.0% (weight) of 98% sulfuric acid), and 60% hydrogen peroxide was 4.7 g (83 mmol). Therefore, the ratio of the hydrogen peroxide molar amount / peroxodisulfuric acid conversion molar amount was 42%.
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