可再生阻燃疏水复合纸板的制备及其力学性能

Preparation of flame retardant hydrophobic renewable composite paperboard and its mechanical properties

为了研制一种兼具阻燃性及疏水性并有优良力学性能的可再生复合纸板,本研究以聚磷酸铵(APP)-卡拉胶(KC)构建了膨胀型阻燃体系(IFR),以正硅酸乙酯(TEOS)-甲基三甲氧基硅烷(MTMS)@氢氧化镁铝(MAH)作为协同阻燃剂、以硅烷偶联剂KH550(AEMO)@SiO_(2)作为疏水性填料、以可再生纸浆为基材,制备了APP-KC-[(TEOS-MTMS)@MAH]-(AEMO@SiO_(2))复合纸板,并测得其力学性能;采用垂直燃烧实验和极限氧指数(LOI)表征纸板的阻燃效果;采用FE-SEM表征微观形貌;通过FTIR分析燃烧前后功能团变化;利用TG分析其热稳定性;采用接触角(CA)测试、滚动角(SA)测试等来测定其疏水性能。测试结果发现,复合纸板吸水率为1.78 g·m^(−2)、戳穿强度为6.4 J;边压强度为8.3 kN·m^(−1)、平压强度为360 kPa。采用优选配方(APP、KC、MTH、ATH的质量比为3∶2∶1∶1)时LOI达到32%;燃烧实验后得炭化长度为19 mm,续焰时间为0.5 s,灼焰时间为3 s。TG结果表明其残炭量为37.5%。SEM结果表明燃烧后的复合纸板表面具有发泡炭层且纤维完整。CA达110.2°,SA为12°,含水率较原纸版降低232%。APP-KC-[(TEOS-MTMS)@MAH]-(AEMO@SiO_(2))复合纸板具有良好阻燃性、疏水性及力学性能。

The purpose of this paper is to study and prepare a kind of renewable composite paperboard with both flame retardancy and hydrophobicity,and to explore its flame retardancy,hydrophobicity and mechanical properties.The intumescent flame retardant system(IFR)was constructed with ammonium polyphosphate(APP)-carrageenan(KC),tetraethylorthosilicate(TEOS)-methyltrimethoxysilane(MTMS)@magnesium aluminum hydroxide(MAH)as synergistic flame retardant,silane coupling agent KH550(AEMO)@SiO_(2) as hydrophobic filler.The flame retardant,hydrophobic and mechanical properties of APP-KC-[(TEOS-MTMS)@MAH]-(AEMO@SiO_(2))composite paperboard were tested.According to the national standard,the main physical properties of corrugated board were measured.The flame retardant effect of corrugated board was tested by vertical combustion test and limiting oxygen index(LOI).The microstructure was characterized by FE-SEM.FTIR was used to study the changes of functional groups before and after combustion.Its thermal stability was analyzed by thermogravimetry(TG).Contact angle(CA)test,rolling angle(SA)test and water absorption test were used to determine its hydrophobicity.The water absorption of composite paperboard is 1.78 g·m^(−2),the puncture strength is 6.4 J,the edge pressure strength is 8.3 kN·m^(−1),and the compressive strength is 360 kPa.The optimal formula is adopted(the mass ratio of APP,KC,MTH and ATH was 3∶2∶1∶1).The limiting oxygen index(LOI)reaches 32%at the same time.After the combustion experiment,the carbonization length is 19 mm,the flame duration is 0.5 s,and the ignition time is 3 s.TG results show that the carbon residue of APP-KC-[(TEOS-MTMS)@MAH]-[AEMO@SiO_(2)]composite paperboard is 37.5%.SEM results show that there is a foamed carbon layer on the surface of the composite board after combustion,and the fiber is still intact.The contact angle is 110.2°.The moisture content is 232%lower than that of base paper.APP-KC-[(TEOS-MTMS)@MAH]-(AEMO@SiO_(2))composite paperboard has good flame retardancy,hydrophobicity and mechanical properties.