细粒子木质素的制备及其对NBR补强作用

采用自制射流装置制备的细粒子木质素作为橡胶补强剂，研究其对NBR的补强作用。结果表明，黑液酸化的pH值、脱水温度以及黑液与酸混合析出木质素时的湍流程度是影响颗粒细度的主要因素；木质素的粒径越小，对硫化胶的补强效果就越显著，当比表面积从3.0 m²·g^-1提高到43.5 m²·g^-1，粒径在100～300 nm之间时，36份木质素可使NBR硫化胶的拉伸强度、撕裂强度和扯断伸长率分别达到20 MPa，42.0 kN·m^-1和730%，显著优于半补强炭黑。;A fine lignin was prepared and its reinforcing effect on NBR was investigated.The results showed that the pH value of the acidified black liquid，the dehydration temperature and the swift of the lignin eluted from the black liquid/sulfur acid mixture were the main effective factors on the particle size of lignin；the smaller the size of lignin particle，the better the reinforcing effect on NBR；the tensile strength，tear strength and elongation at break of NBR vulcanizate reached 20 MPa，42 kN·m^-1 and 730% respectively by adding 36 phr of lignin with surface area of 43.5 m²·g^-1 and particle size of 100～300 nm and were significantly superior to those by adding semi-reinforcing carbon black