漂白化学针叶木泡沫浆料流变性能的研究

陈婷婷; 王晨; 程金兰; 张辉; 宜勇钢

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Study on Rheological Properties of Bleached Chemical Softwood Foam-fiber Suspension

Received:August 26, 2019

DOI：10.11981/j.issn.1000-6842.2020.04.35

Key Words:foam-fiber suspension;polyvinyl alcohol;apparent viscosity;viscosity coefficient;flow index

Fund Project:国家水体污染控制与治理科技重大专项（2017ZX07402004）；国家自然科学基金（31770627）；江苏省高校优势学科建设工程（PAPD）；南京林业大学轻工与食品学院青年教师科研基金。

Author Name	Affiliation	Postcode
CHEN Tingting^*	Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037	210037
WANG Chen	Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037	210037
CHENG Jinlan	Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037	210037
ZHANG Hui	Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037	210037
YI Yonggang	Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037	210037

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Abstract:

The rheological curves and rheological parameters of bleached chemical softwood foam-fiber suspension were measured by the rheo-meter with a propeller-type rotor. The results showed that the fiber suspension with polyvinyl alcohol （PVA） was Herschel-Bulkley plastic shear-thinning fluid when it was not foamed， but its apparent viscosity was higher than that of general fiber suspension. The rheological curves indicated two-stage rheological behavior of the foam-fiber suspension with PVA， shear thinning stage and shear thickening stage. The corresponding shear rate of each rheological turning points between the two stages were about 120， 150， and 190 s^-1， respectively when the fiber mass concentration was 1.5%， 2.0%， and 2.5%. The PVA content had little effect on the rheological property of foam-fiber suspension. The foam-fiber suspension with higher fiber mass concentration had higher shear stress and apparent viscosity. Increasing air content increased the viscosity coefficient K₁ linearly in the shear thinning stage， but reduced viscosity coefficient K₂ followed power-law trend in the shear thickening stage； decreased the flow index n₁ linearly in the shear thinning stage， but increased low index n₂ linearly in the shear thicke-ning stage.

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