脲醛改性酶解木质素对丁苯橡胶阻燃性能的影响

以脲醛改性酶解木质素配合自制的微胶囊红磷(MRP)制得高分子膨胀阻燃剂,用傅里叶变换红外光谱和差示扫描量热法对其进行了表征,并将其添加到丁苯橡胶(SBR)中,研究了SBR的阻燃性能和力学性能。结果表明,脲醛改性酶解木质素在280℃附近出现了1个较强的吸热峰;随着改性酶解木质素或MRP用量的增加,SBR的阻燃性能提高;当改性酶解木质素用量为60份、MRP用量为10份时,或当改性酶解木质素用量为40份、MRP为12份时,SBR的阻燃级别均可达到FV-0级;SBR/改性酶解木质素/MRP共混物的燃烧残渣表面生成了连续而致密的炭层,孔洞很少且细小。当改性酶解木质素用量为40份时,SBR硫化胶具有最佳的拉伸性能;当MRP用量为10份时,SBR硫化胶的综合性能较好。

Effects of enzymatic hydrolysis lignin modified by urea formaldehyde on fire-retardance of styrene-butadiene rubber

The composite of urea formaldehyde modified enzymatic hydrolysis (EH) lignin and micro encapsulated red phosphorus (MRP) was prepared as a new kind of expansion fire-retardant for polymer. The structures and heat performance of EH lignin modified were characterized by Fourier transform infrared spectroscopy and differential scanning calorimetry. The fire-retardance and mechanical properties of styrene-butadiene rubber(SBR) with the modified EH lignin and MRP were investigated. The results showed that there was a strong decalescence at 280 ℃ during the heating process. The flame-retardance were improved when the amount of the modified EH lignin or MRP was increased. The vertical ignition grade of modified SBR all reached FV-0 when the system had 60 phr modified EH lignin and 10 phr MRP, or 40 phr modified EH lignin and 12 phr MRP. The char residue structure of SBR/lignin/MRP composites were continuous and compact, with small holes on their surfaces. In addition, the tensile strength of SBR/lignin/MRP composites were the best when the system had 40 phr modified EH lignin. The integration properties of SBR were better when the system had 10 phr MRP.