| The adhesion of TPU to polyester fabric was studied to improve the interface adhesion of polyester fabric reinforced thermoplastic polyurethane elastomer(TPU)conveyor belt.The surface of polyester fabric is cleaned,roughened,and modified by alkali deweighting,lipase cleaning,and plasma modification.The flow casting process prepared polyester fabric /TPU conveyor belt,and the interface adhesion performance of the conveyor belt was analyzed and discussed.Optimization of process parameters can provide theoretical reference for improving the interface adhesion performance of polyester fabric reinforced TPU lightweight conveyor belt.The evaluation indexes of interlaminar bonding performance mainly include peel strength,tensile strength,elongation at break,etc.The polyester fabric was alkali treated with sodium hydroxide.The effects of temperature,treatment time,and sodium hydroxide concentration on the interface bonding performance of polyester fabric /TPU lightweight conveyor belt were researched experimently.The results show that alkali treatment can roughen and clean the surface of polyester fabric.The alkali hydrolysis reaction is strong,the coarsening and cleaning reaction is not limited to the surface of the filament,and the fabric strength loss is obvious.Alkali treatment has little effect on the thermal stability of the polyester fabric.In combination with the experimental purpose,the concentration of sodium hydroxide is 20%,the solution temperature is 55℃,the treatment time is 1.5 hours,the polyester fabric strength is maintained above 70%,and the peel strength of the conveyor belt is 3.23N/mm,which meets the industry standard and is suitable for the manufacture and use of industrial conveyor belt.The lipase-catalyzed ester hydrolysis was only involved in the most superficial layer of polyester filament,and the retention rate of breaking strength of polyester fabric after lipase cleaning was above 90%.Through response surface screening,the optimal washing conditions were as follows: enzymatic dosage 10g/L,enzymatic hydrolysis temperature37.5℃,and enzymatic hydrolysis time 2.5 hours.According to electron microscope observation,under the experimental conditions,the bond between the fabric and TPU is close,the peeling interface has the appearance of wave fringes,the surface monofilament has the TPU infiltration so that the polyester fabric and TPU are bonded together in the way of Mosaic,and the bonding strength between layers is increased.The peeling strength of the conveyor belt is 5.32N/mm.DSC test showed that the thermal stability of the fabric after cleaning was not affected by the hydrolytic reaction of the filament surface.The results show that the lipase cleaning effect is softer than alkali treatment,and the damage degree of the fabric is less,which can complete the experimental purpose of improving the bonding property between layers of polyester fabric and TPU,and meet the requirements of production and use of conveyor belt.The polyester fabric was modified by plasma.The experimental results show that the fracture strength retention rate of polyester fabric modified by plasma is more than 80%.The optimal modification conditions were screened by response surface,and the gas flow rate was 10 sccm,the discharge power was 100%,and the discharge time was 2.25 min.Under the experimental conditions,the peel strength of the conveyor belt is 3.35N/mm.By electron microscope observation,TPU and polyester fabric were bonded closely in the conveyor belt,and wavy fringes appeared at the peeling interface.DSC test shows that the thermal stability of the fabric modified by plasma is not affected by the surface etching reaction of the filament.The results show that the plasma-modified polyester fabric can achieve the experimental purpose of improving the bonding property between a polyester fabric and TPU layer,the processing method is soft,the operation process is short,and can meet the requirements of conveyor belt production and use. |
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