[分享]防火涂料为什么能阻止火势蔓延？

老郁

<p><span style="FONT-SIZE: 13.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><strong><font size="2">防火涂料为什么能阻止火势蔓延？</font></strong></span></p><p><span style="FONT-SIZE: 13.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;"><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">火灾是人类的大敌。尤其是现代社会，高层建筑林立，各种有机化合物使用日益繁多，极易发生火灾。普通的涂料是一种易燃物质，一旦着火，火势会迅速蔓延。对此，科学家们一直在想办法制造出不但不会燃烧，而且还能阻止火焰扩散的涂料来。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/><br/></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">　　我们知道燃烧的条件有</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;">3</span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">个：一是要有可燃物质，二是要有充分的氧，三是要有一定的温度，三者缺一不可。防火涂料就是针对它们而设计的。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体;"><br/><br/></span><span style="FONT-SIZE: 9pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;">　　这种涂料的组成成分是采用不燃或难燃的材料（如某些不易燃的树脂）作为主要成分的。一旦着火，它会放出能使火焰熄灭的气体。它所采用的辅助成分如染料，也应该是不燃的。另外，有的涂料里还加入了防火剂，在它受到火焰高热时，会分解出不会燃烧的二氧化碳等气体，把氧气与燃烧着的东西隔离开来，使他们因缺氧而熄灭。有的涂料中还加入了磷酸铵、硅油等发泡剂。它们在被烧着时产生大量泡沫，好像一只泡沫灭火器喷出的泡沫，形成一道阻隔层，把火焰包围起来，使之熄灭。有的涂料中还加入了一些低熔点的不会燃烧的材料，如玻璃粉末等。它们会在火焰热量烧烤下被融化，在着火的东西上流淌开来，形成一层隔热的防火层。这些就是防火涂层能阻止火势蔓延的原因。</span></span></p>

czf19515

长见识了， [s:1]