Simulation And Experimental Research On Rubber Electromagnetic Vulcanization

Vulcanization is one of the most energy-intensive processes in the production of rubber products,commonly used vulcanization medium steam and superheated water,the sulfidation medium loses a lot of heat during the transportation process,resulting in large energy consumption.In view of the shortcomings of the waste of ordinary sulfide energy,adopt electromagnetic vulcanization process with high efficiency,energy saving and environmental protection,the tire electromagnetic direct pressure vulcanization is represented,it has become the best choice in the rubber vulcanization industry.In recent years,magnetic polymer composite materials are filled with magnetic fillers to form a magnetic network structure,the formulation and process of the magnetic polymer material has become a hot spot in the field of functional composite materials research today One.The main research work of this paper is based on the mechanism of rubber vulcanization and electromagnetic induction heating,and the induction heat generation mechanism of magnetically conductive fillers in rubber compounds and vulcanizates is proposed,and the mathematical model of electromagnetic heating is established.Combined with the electromagnetic heating process,through experiments,the electromagnetic indirect heating mold heat vulcanized rubber products and the electromagnetic direct heating magnetic conductive filler compound rubber and elastic composite materials were realized.This article is divided into two parts for the research subject,The first part is the study of rubber vulcanization by electromagnetic heating mold,and the second part is the study of rubber vulcanization by electromagnetic direct heating shielding function.The main work completed in this article is as follows:(1)The heat treatment process for the flat mold is based on the magnetization mechanism,According to the principle of magnetic domain distribution inside the heat treatment flat mold,combined with the electromagnetic heating process,the heat treatment flat mold was experimentally explored.After heat treatment,the flat mold can change the magnetic domains inside the metal,thereby effectively saving electromagnetic induction heating energy.In this paper,a three-dimensional software is used to design a combined induction heating coil to change the uniformity of the axial and radial temperature distribution of the flat mold,It is confirmed that the design structure of the induction heating coil plays a vital role in the temperature field distribution.(2)According to the electromagnetic induction vulcanization mechanism and heat conduction principle,the electromagnetic indirect heating mold is used to vulcanize thick ferroferric oxide rubber products,and the heat is transferred to the ferroferric oxide rubber through the mold,and the heat is transferred from the outside of the ferroferric oxide rubber to the middle,The electromagnetic heating process has The parameters are adjustable,the coil structure is easy to arrange,the heating rate is fast and the energy consumption is low etc,so that the outside of the ferroferric oxide rubber has enough time to transfer heat to the ferroferric oxide rubber and the vulcanization is uniform.Test the electromagnetic performance parameters of ferroferric oxide vulcanizate at different temperatures.After fitting,the real part of the dielectric constant,the imaginary part of the dielectric constant and the loss tangent change with the temperature according to the fourth-order polynomial function,The high degree of fitting has a good correlation with temperature.In the frequency range of 915MHz-3000 MHz,after fitting,the real part of the dielectric constant,the imaginary part of the dielectric constant and the loss tangent and the frequency all change according to the fourth-order polynomial function,and the fitting curve is in good agreement with the experimental data.The specific heat of the tested ferroferric oxide vulcanizate is between 0 ?-150 ?,The specific heat gradually increases with the increase of temperature.(3)Based on the induction heat generation mechanism of the magnetically conductive filler in the compounded rubber and vulcanized rubber,the electromagnetically directly heated magnetically conductive filler compounded rubber and elastic composite material,combined with the single coil and multiple coil arrangement of the electromagnetic induction coil The uniformity of the distribution of the temperature field formed by the filler compound rubber and elastic compositematerial was experimentally explored.In terms of the temperature field formed by the electromagnetic direct heating of the magnetically conductive filler compounded rubber,the temperature field distribution of the ferroferric iron compounded rubber compound is even,indicating that the magnetically conductive filler and the rubber compound have a good dispersion effect and will generate a uniformly distributed magnetic field;In terms of electromagnetic direct heating of elastic composite material,the elastic composite material of ferric oxide and ferroferric iron gradually weaken over time,It shows that elastic composite material form a cross-linked three-dimensional network structure during vulcanization,due to the pressure,the ferroferromagnetic particles are agglomerated,and the poor dispersion of the magnetically conductive filler in the vulcanizate causes uneven magnetic field distribution,Therefore,dispersibility plays a key role in the uniformity of the temperature field of magnetically conductive filler compound and elastic composite material.