高性能内燃机用滤纸的制备及其对性能的影响

Preparation of Filter Paper for High Performance Internal Combustion Engine and Its Influence on Performance

采用高强高模聚乙烯(UHMWPE)纤维与针叶木浆混抄,制备具有力学性能高、疏水性好和透气性适当的内燃机用滤纸。通过探讨原纸制备工艺、树脂浸渍和热压工艺对滤纸性能的影响,确定试验条件下的最佳参数,并采用相关手段表征了滤纸的力学性能、热稳定性能、孔径大小以及疏水性能。结果表明:在试验条件下,当UHMWPE纤维与针叶木浆的质量比为8∶2、针叶木浆打浆度为22°SR、分散剂PEO和增强剂CPAM相对于绝干浆的质量分数分别为0.5%和0.1%、热压时间为15 min、热压压力为10 MPa、热压温度为140℃时,制备的内燃机用UHMWPE滤纸性能最佳,其中,滤纸抗张指数为50.28 N·m/g,耐破度为503.55 kPa,接触角为123.52°且1 min内不渗透,熔点提高至155℃。

In order to prepare filter paper with high mechanical properties,good hydrophobicity and proper air permeability for internal combustion engine,the mixture of high strength and high modulus polyethylene(UHMWPE)fiber and softwood pulp was used.The effects of base paper preparation,resin impregnation and hot pressing on the properties of filter paper were discussed,the mechanical properties,thermal stability,pore size and hydrophobicity of the filter paper were characterized.The results showed that when the mass ratio of UHMWPE fiber to softwood pulp was 8∶2 and the beating degree of softwood pulp was 22°SR,the mass fraction of dispersant PEO and reinforcing agent CPAM were 0.5%and 0.1%,respectively,and the hot pressing temperature was 140℃,the hot pressing time was 15 min,and the hot pressing pressure was 10 MPa,the filter paper made by UHMWPE for internal combustion engine has the best performance,in which the tensile index of the filter paper was 50.28 N·m/g,the bursting strength was 503.55 kPa,the contact angle was 123.52°and the filter paper was impervious within 1 min,and the melting point was raised to 155℃.