涂层织物热防护性能研究

Study on Thermal ProtectivePerformance of Coated Fabric

首先采用两种不同涂层方式:单面涂双层(Ld,辐射热防护层涂覆在隔热层上)以及双面涂单层(Ll,分别在基布两面涂隔热层与辐射热防护层)制备不同的双层涂层织物;其次探讨了球状纳米二氧化硅含量、六钛酸钾晶须含量、纳米二氧化钛含量对双层涂层织物热防护性能的影响。结果表明:涂层厚度为0.25 mm、0.37 mm、0.50 mm的涂层织物,随着涂层厚度的增加,涂层织物背面温度达到二级烧伤热温度的时间也依次增长;相同的涂层厚度,涂层织物背面温度达到二级烧伤温度Ld0.25比Ll0.25用时更短,Ld0.37比Ll0.37用时更短,而Ld0.50比Ll0.50用时更长;随着球状纳米二氧化硅质量分数的增加,织物背面温度达到二级烧伤温度的时间依次增长;六钛酸钾晶须质量分数在3%~12%内,随着质量分数的增加,所制备的涂层织物达到二级烧伤温度的时间也随之增加;纳米二氧化钛质量分数为15%时,达到二级烧伤温度的时间最长;质量分数为3%时,达到二级烧伤温度时间最短。

Firstly, two different coating methods were adopted: one-sided coating with double layers ( Ld, the radiation thermal protection layer was coated on the thermal insulation layer) and two-sided coating with single layer ( Ll, the thermal insulation layer and radiation thermal protection layer were respectively coated on both sides of the base cloth) to prepare different double-layer coated fabrics. Secondly, the effects of the contents of spherical nano-silica, potassium titanate whisker and nano-titanium dioxide on the thermal protective performance of double-layer coated fabrics were explored. The results showed that with the increase of the coating thickness of 0. 25 mm, 0. 37 mm and 0. 50 mm coated fabrics, the time for the temperature of the back of the coated fabric to reach the thermal temperature of second-degree burns also increased. With the same coating thickness, it took less time for Ld0. 25 than LI0. 25 to reach the second-degree burn temperature, less time for Ld0. 37 than LI0. 37 to reach the second-degree burn temperature, and more time for Ld0. 50 than LI0. 50 to reach the second-degree burn temperature. With the increase of mass fraction of spherical nano-silica, the time of the back temperature of the fabric reaching the second-degree burn temperature increased gradually. The mass fraction of potassium hexatitanate whisker was within 3%~ 12%, and with the increase of mass fraction, the time for the coated fabric to reach the second-degree burn temperature also increased. When the mass fraction of nano-titanium dioxide was 15%, the time for the back surface temperature of the coated fabric to reach the second-degree burn temperature was the longest. When the mass fraction was 3%, the time to reach the second-degree burn temperature was the shortest.