Characterization Of Surface Viscosity Of Stickies Particles And The Controlling Of Deposition Trend In Waste Paper Pulp

In waste pulp stickies according to size can be divided into stickies,micro stickies and potential secondary stickies;traditional determination of Stickies influence on papermaking process method is mainly TAPPI277 method and ingede method,two methods mainly based on Stickies size of glue sticky material screening,then according to the number of Stickies to judge the impact of stickies in papermaking process,two methods mainly based on Stickies size on Stickies screening results cannot be accurately characterize stickies deposition to papermaking equipment ability.The purpose of the research is to establish a simple and effective applicable to factories stickies surface stickiness test methods,and the use of the methods of testing for rating the paper-making environment changes of Stickies surface viscous effects.Study on the content of the thesis is divided into three parts:(1)to establish a method for determination of the viscosity of Stickies surface;(2)stickies surface stickiness and stickies deposition performance relationship;(3)lipase compound enzyme preparation of preparation and used to study the surface stickiness stickies control.The sticky glue changes occur without environment,The results show that slurry were added as polyacrylate(PA)、poly(vinyl acetate(PVAc)、glycerin triglyceride(TG)、styrene butadiene rubber(SBR)、polyvinyl alcohol(PVA)different kinds of models,paste in the treatment for 1h,different kinds of models of peel strength,added with polyacrylate(PA)of the pulp stickies surface viscosity maximum is 0.1607N/mm,added with polyvinyl alcohol(PVA)pulp stickies surface stickiness is 0.1201N/mm,slurry content more,sieved stickies more determination of peel strength.The second part mainly change the slurry in the environment,including slurry within the content of inorganic salt,temperature and pH value,through changes in the environment.determination of the influence of environment on Stickies surface viscous,simultaneous determination in different conditions of Stickies deposition performance,analysis of influence of Stickies surface viscosity on the deposition performance;inorganic salt slurry is mainly calcium ion,magnesium ion,aluminum ion,sodium ion and barium ion inorganic salt temperatures approaching the actual production of papermaking temperature.The results show that:adding inorganic salt slurry,enhance stickies surface viscosity,in a certain range,the higher the content of inorganic salt,the greater the surface viscosity of Stickies;taking calcium ion as an example,when the content of calcium in the slurry increased from 0g to 3g,determination of peel strength increases gradually,when the content is 3g when added,polyacrylate(PA)and polyvinyl acetate(PVAc)stripping maximum intensity generated,respectively 0.7676N/mm and 0.7554 N/mm,under this condition,the deposition area and the number of polyacrylate stickies respectively by 3997mm2 ·m-2 up to 24226mm2 ·m-2,the largest number of Stickies by 8760.4 个/m·2 up to 96750 个/m-2;temperature rise,enhancement of Stickies surface viscosity,the temperature increased from 35℃ to 65℃,polyacrylate(PA)produced by the peel strength increased from 0.1205N/mm to 0.1732N/mm,Elevated temperature,stickies deposition performance enhancement;stickies under different pH,the surface viscosity is different,the selected pH＝5、6.5、8、9 were studied.When the pH value and stickies surface viscosity maximum.The third part mainly by lipase and surface active agent on Stickies processing,research of lipase and surfactant on Stickies surface viscosity control effect,when used alone,dosage of lipase and surfactant respectively 100,200,300,500 ppm,combination,lipase dosage 200ppm,the amount of surfactant respectively 100,200,300,500 ppm.The results showed that the lipase and surfactant treatment can reduce the stickies surface viscosity when lipase dosage is 200ppm,on surface stickiness stickies control effect best,determination of the peel strength of the largest decline rate is about 10%when dosage of surface active agent 300ppm,on surface stickiness stickies control effect best,determination of the peel strength of the largest decline rate is about 9%,using both complex and determination of the peel strength of the largest decline rate is about 13%;stickies Surface Viscous treatment with lipase and surface active agent,slurry filtrate and filter water can also change.