Preparation and thermal insulation properties of SiO2 aerogel/potassium hexatitanate whisker composite coated fabric
In order to further improve the thermal insulation performance of SiO2 aerogel coated fabric and explore the influence of coating process on the performance of SiO2 aerogel/potassium hexatitanate whisker composite coated fabric,both single SiO2 aerogel coating fabric and SiO2 aerogel/potassium hexatitanate whisker composite coating fabric were prepared,and their thermal insulation were tested.The results show that the thermal insulation performance of the fabric coated with single SiO2 aerogel is in direct proportion to the content of thermal insulation particles.The thermal insulation performance of the fabric is further improved after doping potassium hexatitanate whiskers.And the thermal insulation performance of the fabric first increases and then decreases with the increase of the SiO2 aerogel content.When the ratio of SiO2 aerogel to potassium hexatitanate whiskers is 3∶7,the thermal insulation performance of the coated fabric is the best.The thermal insulation performance of coated fabrics is also affected by the content of polyacrylate.With the increase of polyacrylate content,the thermal insulation performance of coated fabrics shows a downward trend.When the ratio of deionized water to polyacrylate is 9∶1,the thermal conductivity of the composite coated fabric is the lowest of 0.231 5 W/(m·K),which is 19.4%lower than that of the original fabric.When the ratio of polyacrylate to deionized water is 2∶8,the coated fabric has the lowest temperature rise rate on the inner and surface under heat source irradiation,which is 19.70℃lower than that of the original fabric.
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