Microwave-assisted In-situ Modification Of Ferrite To Prepare Magnetically Damped Styrene-butadiene Rubber

Because the traditional damping rubber can not adapt to the wide temperature domain,wide frequency work,magnetic damping rubber uses mechanical energy-magnetic energyinternal energy coupling damping action,in line with the intelligent development trend of damping rubber,so it is a kind of damping material with broad prospects.However,how to regulate the interface between magnetic particles and rubber matrix has become a key problem that limits its development.Therefore,it is of far-reaching significance for the development of magnetic damping rubber to develop a simple,efficient and low-cost interface control method.For this reason,this paper chooses styrene-butadiene rubber with low price,easy supply and moderate damping property as matrix and strontium ferrite with high performance-price ratio and good magnetic property as filler.the corresponding magnetic damping styrenebutadiene rubber was prepared by a new microwave-assisted ferrite in-situ modification process,and its interface and properties were studied.The research content of this paper is mainly divided into:1)Introduction and interface study of microwave-assisted in-situ modification of ferrite.The mixture of ferrite and butadiene rubber was prepared by mixing mixer,then the microwave processing time and power was changed to synthesize corresponding mixture.After fabrication,these samples are then characterized by infrared(IR)spectroscopy,differential scanning calorimeter(DSC),thermogravimetric(TG),scanning electron microscopy(SEM),rubber processing analyzer(RPA)and high resolution transmission electron microscope(HRTEM)to observe the structure and interaction of the interface;2)Preparation of magnetic damping styrene butadiene rubber by microwave assisted ferrite in situ modification and its properties.The modified products with different microwave technology and different ferrite content were further processed to prepare Magnetic damping styrene butadiene rubber.Its vulcanization processing characteristics,mechanical properties and damping properties were studied;3)Amplification process design of magnetic damping styrene butadiene rubber prepared by microwave assisted ferrite in-situ modification.According to the characteristics of the product to carry out the corresponding production process design,material balance,equipment selection and design,product inspection and pollution treatment.The following conclusions are obtained:(1)The interfacial study of blends under different microwave treatment conditions:with the extension of microwave treatment time and the increase of microwave power,the content of C=C in the blends decreases continuously,indicating that the microwave absorbed by ferrite can effectively break the carbon-carbon double bond in the rubber molecular chain;When the ferrite content is 60 phr and the microwave power is 600 W,the content of bound rubber on ferrite surface,the degree of interfacial bonding and the interfacial interaction increase first and then decrease gradually when the microwave treatment time is changed.When the microwave treatment time is 6 min,the content of bound rubber on ferrite surface is the highest,the interface between ferrite and rubber matrix is better,and the interface interaction is the highest.When the ferrite content was 60 phr and the treatment time was 6 min,the content of bound rubber on the surface of ferrite,the degree of interface binding and the interface interaction basically increased with the increase of microwave treatment power.(2)Through the performance test of modified magnetic damping styrene butadiene rubber with different microwave treatment conditions and different ferrite content,it can be found that:1.The ML value and T90 of the mixed rubber increases and decreases with the increase of microwave treatment time,power and ferrite content,respectively;MH increased with the increase of ferrite content;2.When the ferrite content is constant,Payne effect can be used to predict the damping performance,MH and tensile strength of magnetic damping styrene butadiene rubber well,but there is a certain deviation when using Payne effect to predict ML and tensile strength of magnetic damping styrene butadiene rubber at high power or for a long time;3.Taking the TA value of vulcanized rubber without strontium ferrite as the standard,the damping performance of magnetic damping styrene-butadiene rubber increased by 7.64%using 60 phr-800 W-6 min;4.When the treatment power and time are constant,the tensile strength and elongation at break of vulcanized rubber decrease simultaneously with the increase of ferrite content,when the ferrite content is 100 phr,the damping performance of magnetic damping styrene butadiene rubber decreases suddenly;5.After magnetization,the tensile strength of vulcanized rubber is obviously improved,and accordingly,the elongation at break is also significantly decreased.(3)According to the target demand,the annual output of magnetic damping styrene butadiene rubber in a single production line is 300 tons,the corresponding amplification process is designed,the corresponding material,equipment selection and design are carried out.Then,the corresponding finished product testing and pollutant control strategy are preliminarily established.