基于醛类交联剂的煤焦油沥青族组分改性石油沥青

Asphalt modification with coal tar pitch component based on aldehyde crosslinkers

以中温煤焦油沥青的四氢呋喃萃取物(THFS)对石油基质沥青进行改性,考察了掺混量、掺混温度和不同种类交联剂对改性沥青性能的影响,确定了THFS最佳掺混量为8%,最佳掺混温度为135℃,甲醛交联剂的最佳掺混量为0.8%,三聚甲醛的最佳掺混量为0.2%。考察了两两和单族组分对基质沥青的改性性能,发现重油(HS)使得改性沥青的针入度、延度增大,沥青烯(A)和甲苯不溶四氢呋喃可溶物(PA)提高感温性,软化点升高。随着醛类交联剂的添加,提高了改性沥青的抗老化性能;甲基(CH_3)、亚甲基(CH_2)透射峰强度逐渐变强,770-730 cm^(-1)、710-690 cm^(-1)和770-810 cm^(-1)苯环取代透射峰强度逐渐增强,1 010^(-1) 270 cm^(-1)处C-O-C伸缩振动峰逐渐增强;热解峰温向高温移动,残炭率增加2%;改性粒子呈现一种连续的流线分布,添加三聚甲醛的改性沥青的流线分布更加集中。

Adopting tetrahydrofuran solubles of coal tar pitch（ THFS） for petroleum asphalt modification,effects of different amounts of mixing,blending temperatures and cross-linking agent on the modified asphalt performance were examined. The optimum blending conditions were determined as amount of THFS,formaldehyde and trioxymethylene cross-linking agents being 8%,0. 8% and 0. 2%,respectively at 135 ℃.Hexane soluble（ HS） leads to the penetration and ductility of modified asphalt increase,but asphaltene（ A） and preasphaltene（ PA） improve the temperature sensitivity and raise the softening point. The addition of cross-linking agent improves the aging performance of modified asphalt; the methyl（ CH_3） and methylene（ CH_2）transmission peak intensity of modified asphalt gradually become stronger; the substituted benzene ring transmission peak intensity at 770-730 cm^-1, 710-690 cm^-1 and 770-810 cm^-1 gradually increases,and C-O-C vibration transmission peak intensity of 1 010^-1 270 cm^-1 increases. The pyrolysis peak temperature moved to higher temperature,and the increase of char yield is about 2%. The modified particles exhibit a continuous distribution of flow lines,the streamline distribution of modified asphalt with adding trioxymethylene is more concentrated.