共查询到19条相似文献,搜索用时 109 毫秒
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以聚磷酸铵为酸源、季戊四醇为碳源、双氰胺和磷酸氢二铵为气源、热固性的水性环氧乳液和热塑性的醋-丙乳液复配为成膜物,制备了膨胀型水性防火涂料.采用模拟大板燃烧法对其耐火性能进行了研究,并用傅里叶红外光谱仪(FT - IR)分析灼烧后膨胀炭层的成分,用电子显微镜观察炭层的炭孔状况.结果表明:热固性的水性环氧乳液能有效提高膨胀型醋-丙防火涂料的防火隔热性能.当添加量为6%(质量分数)时,灼烧60 min后,炭层整体强度达到2.26 N/cm2,膨胀倍率为37倍,木板背火温度仅66℃,红外光谱分析表明炭层与木板连接处还有成膜物存在.另外,炭层电镜照片分析表明添加水性环氧乳液后也有利于改善膨胀炭层的质量. 相似文献
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水性超薄型钢结构防火涂料的研制与性能研究 总被引:2,自引:0,他引:2
以丙烯酸类乳液为成膜物质,以季戊四醇、三聚氰胺、聚磷酸铵与无机增强填料作为阻燃体系,制备了水性超薄型钢结构防火涂料.采用模拟大板燃烧法对防火涂料的耐火性能进行了研究,系统考察了乳液种类、颜基比以及无机填料对防火性能的影响,确定了无机填料的最佳用量.研究结果表明:以硅丙乳液作为基料树脂,当体系颜基比为3.5以及珍珠岩的添加量为7%时,防火涂料的耐火时间能达到128.7 min;珍珠岩与炭质层的生成具有明显的协同效应,这大大提高了炭质层的强度,而且还表现出显著的隔热效果. 相似文献
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埃洛石对水性超薄膨胀型钢结构防火涂料防火性能的影响 总被引:2,自引:0,他引:2
以聚丙烯酸酯乳液为基体树脂,多聚磷酸铵、三聚氰胺、季戊四醇等为主阻燃剂,埃洛石纳米管(HNTs)为阻燃协效剂,制备了水性超薄膨胀型钢结构防火涂料,采用模拟大板燃烧法和锥形量热仪对其耐火性能进行了研究,并用扫描电镜观察了膨胀炭层的表面形貌。结果表明:HNTs对防火涂料的耐火性能影响显著,当阻燃体系中HNTs含量为10.86%时,HNTs与主阻燃剂之间有阻燃增效作用,所制备防火涂料的耐火时间为107 min,点燃时间为24 s,热释放速率峰值与点燃时间比为4.97,燃烧残余量高达48.36%,且燃烧残余物表面致密,显示出优异的耐火性能。 相似文献
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以可膨胀石墨(EG)和绢云母为新的阻燃材料,三聚氰胺(MEL)、聚磷酸铵(APP)、季戊四醇(PER)为膨胀阻燃体系,水性乳液为基体制备水性饰面型防火涂料;采用自制高温电炉装置,研究EG与绢云母配比、膨胀阻燃体系、基体拼合对水性饰面防火涂料性能的影响.结果表明,可膨胀石墨和绢云母的质量比为5∶3,APP/MEL/PER的质量比为4∶3∶3,氯偏乳液与纯丙AC261P乳液质量比为22∶3时,制备的防火涂料涂层受热膨胀效果显著,形成了“窝状”构的膨胀炭质层,炭质层孔洞均匀致密,与基材粘附性好、强度高,耐火性能最好,耐火时间高达22min. 相似文献
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以水性树脂为基体,聚磷酸铵(APP)、三聚氰胺(MEL)、季戊四醇(PER)为膨胀阻燃体系,可膨胀石墨(EG)和绢云母为填料制备了水性膨胀型钢结构防火涂料;研究了基体拼合、膨胀阻燃体系、EG与绢云母配比对钢结构防火涂料性能的影响。结果表明:氯偏乳液与纯丙AC261P乳液质量比为22:3,APP、MEL、PER的质量比为4:3:3,可膨胀石墨和绢云母的质量比为5:3时,制备的防火涂料涂层受热膨胀倍率为5.68倍,形成了"蜂窝状"结构的膨胀炭质层,孔洞均匀致密,与钢板粘附性好、强度高,耐火性能好,耐火极限高达2 997 s。 相似文献
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综述了改进膨胀型阻燃聚丙烯(PP)复合材料相容性的研究进展,相容性改进技术包括采用不同的成炭剂、微胶囊化、采用偶联剂、接枝改性、乳液共混以及合成和使用单组分膨胀型阻燃剂等。阻燃剂单体与PP接枝共聚、合成能与PP相容的含有膨胀型阻燃剂的炭源、酸源、气源的聚合物是相容性改进研究的发展方向。 相似文献
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选择了纤维素、壳聚糖、淀粉三种天然大分子作为碳源,聚磷酸铵(APP)作为酸源和气源,按1∶2的质量比复配成三种不同的膨胀型阻燃剂。然后将三种膨胀阻燃剂添加到热塑性动态硫化橡胶(TPV)材料中,通过熔融共混的加工方法,制备得到阻燃TPV复合材料。力学性能测试实验显示,不同碳源的阻燃TPV复合材料的力学性能依次为:纤维素>壳聚糖>淀粉。极限氧指数和垂直燃烧实验结果表明:当阻燃剂质量分数达到30%时,以纤维素作为碳源的TPV复合材料的阻燃性能最好,其氧指数最高为25%,相对于纯TPV的19%,提高了6%,而且能达到V-1等级;壳聚糖和淀粉为碳源TPV复合材料的氧指数分别达到了23%和22%,且都能达到V-2等级。通过TGA和SEM研究了阻燃机理,结果表明,与其他两种碳源相比,纤维素为碳源的TPV复合材料的热稳定性最高,且在燃烧时能形成更加致密的炭层。 相似文献
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膨胀型阻燃剂的研究进展 总被引:2,自引:0,他引:2
由于膨胀型阻燃剂(IFR)的环保和高效性,IFR的研究受到了普遍关注。在IFR的合成、应用方面取得了一定的进展。但目前IFR的应用范围有限,在其配方设计,阻燃机理等方面有待深入研究。合成集气源,酸源,碳源于一体的大分子IFR,超细化和微胶囊化处理是IFR未来的发展方向。 相似文献
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In this study the applicability of flame retardant mixed with a carbon source (such as pentaerythritol) for the intumescent fire retardant coating (IFRC) daubed on the top of a piece of plywood was investigated. There are three kinds of flame retardants used in this study: (1) artificial mesophase graphite powder (MGP), (2) sericite (Al4(OH)4(KAlSi3O10)2), and (3) graphite. The desirable sizes of graphite, MGP and sericite were obtained by sieving. The graphite, MGP and sericite were characterized using a scanning electron microscope (SEM) and an energy dispersive spectrum (EDS). The IFRC, which consisted of 19.8% of flame retardant (or flame retardant mixed with carbon source), 15% of dehydrate agent, 18% of foaming agent, 7.2% of resin binder, and 40% of solvent, was prepared and daubed on the top of plywood. The fire protection capability of IFRC was tested using a flammability 45° tester. A conventional IFRC (with the carbon source) was also prepared to study the effect of adding the mixture of flame retardant and carbon source on the fire protection capability of IFRC. The microstructures of the conventional IFRC, the IFRC with flame retardant, and the hybrid IFRC (with flame retardant and carbon source) were inferred and demonstrated using SEM micrographs of the cross-section of three kinds of burnt IFRC. Most interestingly, the fire protection capability of the hybrid IFRC exceeds that of the conventional IFRC even though the percentage of carbon in the burnt hybrid IFRC is less than that in the burnt conventional IFRC. 相似文献
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The transition from smoldering to flaming was studied on fabric, batting, and foam assemblies via an electric spot ignition source of similar intensity to a cigarette. The materials studied included four different fabrics (cotton, polyester, cotton/polyester blend, flame retardant cotton/polyester blend), two types of batting (cotton, polyester), and three types of polyurethane foam (nonflame retardant, flame retardant by FMVSS 302 testing, flame retardant by BS5852 testing). The results from testing found that materials highly prone to smoldering could propagate smoldering into foams and lead to ignition, whereas materials that tended to melt back from the ignition source did not. Flame retardant fabrics or foam can and do prevent the transition from smoldering to flaming provided sufficient levels of flame retardants are incorporated in the upholstery fabric or foam. The transition from smoldering to flaming of cotton fabric/nonflame retardant foam assembly was also studied using temperature measurements and evolved gas analysis. It was determined that the transition takes place when the oxygen consumption by accelerating smoldering front exceeds the oxygen supply. At this point, the solid fuel gasification becomes driven by thermal decomposition rather than by surface oxidation which leads to high enough concentrations of fuel for flaming combustion to occur. 相似文献
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通过三乙氧基硅氢改性纤维素合成了一种硅烷改性纤维素材料(SOCL),通过FT-IR、SEM、TG对其进行结构和热性能分析;并把SOCL做碳源与聚磷酸铵(APP)复配成膨胀型阻燃剂(IFR),用于阻燃聚丙烯(PP)。结果表明:硅烷改性纤维素能很好地提高纤维素的热稳定性;与APP复配能有效提高PP的阻燃性。 相似文献
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选择自制碳源、酸源、气源与一体的阻燃剂B-1,螺环类阻燃剂-PEPA及具有酸源和气源的多聚磷酸铵(APP)为基本阻燃元素进行配方设计,考察了不同成碳剂品种(A1、A2、A3、A4、A5)及用量对阻燃效果的影响。试验结果表明:PEPA与APP复配具有很好的阻燃效果,当PEPA/APP配比在60~40/40~60范围内,成碳剂A1加入量为1.0%,阻燃剂总添加量为30%时达到UL-94 V-0标准,通过优化偶联剂的品种和用量,使膨胀型阻燃聚乙烯在拥有阻燃效果的同时具有优良的力学性能及加工性能。 相似文献