浆料打浆度对纤维素薄膜光学及力学性能的影响

Effects of Pulp Beating Degree on Optical and Mechanical Properties of Cellulose Films

关键词:  PFI磨浆  纤维素薄膜  打浆度  透光率  雾度

Key Words:PFI refining  cellulose film  beating degree  transmittance  haze

摘要:探究了磨浆工艺对纤维素薄膜光学及力学性能的影响。通过PFI磨浆机磨浆，得到打浆度分别为60°SR、70°SR、80°SR和90°SR的乌针浆，经疏解、真空抽滤和真空干燥等工艺，制备纤维素薄膜，并测试其透光率、雾度和力学性能。结果表明，通过PFI磨浆工艺改变乌针浆的打浆度，能够调节制备的纤维素薄膜的光学和力学性能。当乌针浆打浆度从60°SR提高到90°SR，制备的纤维素薄膜的结晶区尺寸从8.8 nm降低至8.6 nm，结晶度从64.3%降低至58.7%；透光率从35.7%提高到50.5%，雾度从97.8%降至94.5%；打浆度90°SR乌针浆制备的纤维素薄膜拉伸强度和拉伸应变分别达31.5 MPa和7.5%。

Abstract:The effect of refining process on the optical and mechanical properties of cellulose films was studied in this paper. The black needle pulp with beating degrees of 60°SR， 70°SR， 80°SR and 90°SR， respectively， were obtained through refining by PFI refiner. Then， the cellulose films were prepared by defibering， vacuum filtration and vacuum drying， of which the transmittance， haze and mechanical properties were measured. The results showed that changing the beating degree of black needle pulp by PFI refining process could adjust the optical and mechanical properties of prepared cellulose films. When the beating degree of black needle pulp increased from 60°SR to 90°SR， the size of the crystalline region of the prepared cellulose film decreased from 8.8 nm to 8.6 nm， the crystallinity decreased from 64.3% to 58.7%， and the transmittance increased from 35.7% to 50.5%， the haze decreased from 97.8% to 94.5%. The tensile strength and tensile strain of cellulose films prepared from black needle pulp with a beating degree of 90°SR reached 31.5 MPa and 7.5%， respectively.