In Situ Deposition Of Nano Calcium Carbonate On Cotton Fabrics And The Effect On Their Properties

As a natural cellulose material,cotton fiber has many excellent characteristics,such as soft handle,good hydrophilicity and permeability,which makes it widely used in textile industry.However,the strength of cotton textiles is not high,which has a certain impact on its application.In this paper,in order to improve the physical and mechanical properties of cotton fabrics,the method of in-situ deposition of nano calcium carbonate on cotton fibers is adopted to enhance the strength of textiles.Through the analysis of the fiber surface morphology,cellulose crystal form,crystallization index,mechanical properties,thermal stability,wettability and water washing resistance of the cotton fabric deposited with nano calcium carbonate before and after treatment,it is concluded that the nano calcium carbonate particles formed on the fiber are diamond cube structure,belonging to calcite crystal form,and the size is about tens of nanometers to hundreds of nanometers.After deposition,the breaking strength of the fabric is increased by about 5% ? 12%,the crystallization index is increased by about7%,the thermal stability of the fabric is improved,and the hydrophilicity of cotton fabric is not greatly affected.After ultrasonic washing and machine washing,the nano calcium carbonate on the fiber did not fall off obviously,and its breaking strength was still improved compared with raw cotton.As ethanol is a small molecule organic solvent with strong permeability,it may carry calcium ions into the deeper area of cotton fiber and improve the deposition performance of nano calcium carbonate.Therefore,in the experiment,we try to deposit nano calcium carbonate on cotton fiber by deposition after ethanol pretreatment or deposition after impregnation of cotton fabric with ethanol calcium hydroxide mixed solution system,The effects of different deposition methods on the structure and properties of cotton fabrics were studied.The results show that the breaking strength of cotton fabric deposited after ethanol pretreatment or impregnated with ethanol calcium hydroxide mixed solution system increases by about 8% ? 14% and 4% ? 10% respectively.The breaking strength of the fabric is more significantly improved,and the thermal stability and crystallinity index of the fiber are also improved to a certain extent.In addition,the hydrophilicity of cotton fabric was improved after impregnation with calcium hydroxide solution.Finally,the cotton fabrics before and after deposition were dyed respectively,and the influence of calcium carbonate deposition on the dyeing process was investigated by analyzing its K/S value and dye uptake.The results show that the breaking strength of cotton fabric is still improved after dyeing and deposition after dyeing by different methods,and its K/S value remains basically unchanged.The K/S value of the original sample is 12.31,and the K/S value of dyeing after deposition is about 11.56 ? 13.11.However,the K/S value of the fabric will be reduced after nano calcium carbonate deposition after dyeing,and the dye uptake of the fabric will not change much.The color fastness to soaping is good,and the overall color fastness of cotton fabric after in-situ deposition of calcium carbonate is excellent.The above results show that the mechanical properties of cotton fabric are significantly improved after different deposition methods,and the deposition of nano calcium carbonate on the fiber will not affect its dyeing process.