| The paper focus on developing neo-type heat-resistant conveyor belt of T4/175℃whichconforms to GB/T20021-2005, and studying three core characteristics including factorsinfluencing high-temperature-adhesion, temperature-conducting characteristic of the coverrubber and testing-technology characteristic of the adhesion strength simulating on-line hotmaterials.The reaction mechanism is studied,which include rubbers as EPDM,SBR and NR, as wellas vulcanization system. The amount of the materials such as curing agent, accelerator andactivator in vulcanization system is calculated on the basis of reaction mechanism, species ofrubber and molecular structure of rubber. Series of experiment have been done to verificate theaccurateness about the method of quantitative calculation.Influence of structure design on adhesion strength of the heat resistant conveyor belt at175℃has been studied. Research shows, adhesion strength between cover rubber and1stfabricmeet the standared both at room temperature and at175℃,which conveyor belt is made ofEPDM cover rubber and EPDM/NR core rubber.Fabrics used as carcass of heat-resistant conveyor belt are studied on its heat-stablityproperty, heat-aging property and heat-adhesion property for diffrent time at175℃. Researchshows, fabric of AA2-type has the best heat-resistant properties and it’s suited to be as carcass ofneo-type heat-resistant conveyor belt.Comprehesive properties of EPDM cover rubber and EPDM/NR core rubber elastomermaterials are studied,such as physical property, heat-aging property, curing property andadhesion strength between layers of the heat-resistant conveyor belt both at room temperatureand at175℃. Research shows that depth of EPDM cover rubber contact with the air/oxygen isthe key factor to the aging-resistant property at175℃.Focused on the characteristics and mechanism of adhesive reaction as well as influencingfactors to interfaces of heat-resistant conveyor belt at175℃. Results shows elementalcomposition of fabric is the most critical factor to adhesion strength at175℃. Compared withthe dipped EA-type fabric, adhesion strength at175℃between AA2-type fabric and EPDMcover rubber has been increased to179%.Corresponding relation among thickness of the cover rubber, interface temperature andadhesion strength has been studied through building mathematical model and testingtemperature-conducting characteristics of EPDM cover rubber for heat-resistant conveyorbelt.Research showed that the relationship about temperature-conducting-rate andtemperature-conducting-time is assume like a straight line to cover rubber with certain thickness.A new experimental technology of testing adhesion strength is studied which imitateson-line conditions with hot materials on heat-resistant conveyor belt. Experimental dates throughthe two different methods has been analysised. Results shows that the experimental technologyimitating on-line could test adhesion strength of belt with hot materials more authentically.The neo-type heat-resistant conveyor belt of T4/175℃developed in this paper has met thestandard of GB/T20021-2005. The new production has excellent quality in stabilityperformance, adhesion performance and aging performance at175℃. Both certificate ofinspection and certificate of patent by authorities have been obtained. |
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