Preparation and Properties of Starch Modified Municipal Sludge Based New Paperboard Material
The harmless municipal sludge has been used as a paper filler to replace fibers in paper-based materials,which is an efficient way to mitigate the wood shortage.However,this paper-based material with the addition of municipal sludge has poor mechanical properties.To solve this problem,the coating effect of different starch,such as cationic starch,corn starch,and potato starch on municipal sludge was investigated,as well as the mechanical properties of the paper-based material.Subsequently,the morphology,thermal stability and chemical composition of paper-based materials prepared by pure fibers,coated fillers and non-coated fillers were studied.Moreover,the coating mechanism of cationic starch and its enhancement mechanism to the mechanical properties of paper-based materials were explored.As a result,2.5%coating amount of cationic starch obtained the best performance,with the retention rate of 79.58%and the tensile index of 8.99 N·m·g-1,representing an improvement of 66.76%and 45.71%over the non-coated sample,respectively.The tensile index was 42.25%higher than that of pure fiber samples.These improvements were attributed to the promotion of hydrogen bond formation between fillers and fibers by the starch coatings.It also improved the mechanical properties and thermal stability of the material,as well as the retention rate of fillers.Therefore,the high-retention and high-performance paperboard material could be prepared with municipal sludge fillers with starch coatings.These findings provide theoretical and technical support for the utilization of municipal sludge as a novel paper filler,promoting the development of low-carbon cycles in the paper industry.
Starch coating modificationNew filler of municipal sludgeMechanical propertiesResource reuse
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