Modification Of Illite And Its Application In Styrene-butadiene Rubber

Clay resources exist widely in nature and have the advantages of green environmental protection and low price.The application of clay in polymers can not only reduce the cost,but also improve the strength,hardness,dimensional stability,and some special properties of the excipient polymers.Therefore,the research and application of polymer/clay materials have been enduring for decades.However,the disparate surface energy gap between clay and polymer will significantly affect its uniform dispersion in the polymer matrix,which will then affect the full play of the clay properties,and even deteriorate the original properties of the polymer.Therefore,how to organically modify clay to form a good interfacial bond with the polymer matrix to fully demonstrate its reinforcing effect has become an eternal in the field of polymer/clay material research and application.theme.In recent decades,there have been many reports on the application and research of montmorillonite and kaolin in polymers,but few reports on illite with a structure similar to montmorillonite.Based on this subject,the illite was firstly modified organically.Then it was applied to styrenebutadiene rubber to investigate the modification effect and the reinforcing effect of modified illite on styrene-butadiene rubber.The specific research results are as follows:1.The dry modification of illite with Si-69 was designed,and the modified illite/styrene-butadiene rubber composite material was prepared by compounding with styrene-butadiene rubber by melt blending method.Effects of vulcanization properties,tensile tear properties,processability,DIN wear,morphology and structure of styrenebutadiene rubber composites.The SEM results show that compared with the unmodified illite,the illite modified with Si-69 can significantly improve the interfacial bonding between the two,and the illite is more uniformly dispersed in the styrenebutadiene rubber matrix.;The test results of mechanical and mechanical properties show that the illite/styrene-butadiene rubber composite modified with 1.5 % Si-69 has the best modification effect,the tensile strength is 7.29 MPa,which is increased by86 %,and the wear resistance is also improved.It can be seen from the test results of binding glue and crosslinking density that Si-69 modification is beneficial to improve the interfacial interaction between illite and rubber matrix.2.DTAB/CTAB/ODA was designed to modify illite by wet process,and the modified illite/SBR composite was prepared by melt blending method with SBR,and then the effect of different amounts of DTAB/CTAB/ODA on the vulcanization properties,tensile tear properties,processing properties,DIN abrasion,morphological structure and other properties of illite/SBR composite was systematically investigated.The SEM results showed that the cationic surfactant-modified illite led to a significant improvement in the overall performance of the rubber matrix compared with the unmodified illite,and the tensile performance data showed that the 6 % CTAB-modified illite had the best reinforcement effect on the SBR composites,with a tensile strength of 6.68 MPa,an increase of 68 %,and an improvement in wear resistance,as shown by the bonding rubber and The results of crosslink density test showed that the cationic surfactant modification was beneficial to improve the interfacial interaction between illite and the rubber matrix.3.Two kinds of PEIs with different molecular weights were designed to modify illite,and the modified illite/styrene-butadiene rubber composites were prepared by melt blending method and compounded with styrene-butadiene rubber.Effects of hydrochloric acid pretreatment on the vulcanization properties,tensile tear properties,processability,hardness,wear resistance,morphology and structure of illite/styrenebutadiene rubber composites.The SEM results show that compared with unmodified illite,PEI can form good adsorption on the surface of illite,thereby effectively enhancing the interfacial interaction between the two;tensile properties test data show that 6 % PEI(Mw=1800)modified acid-washed illite has the most obvious reinforcing effect on SBR composites,the tensile strength is 8.06 MPa,which is increased by 106 %,and the wear resistance is also improved.4.The illite was modified by blending with different amounts of silica,and the modified illite/styrene-butadiene rubber composite was prepared by compounding with styrene-butadiene rubber by melt blending method.The effects of different ratios on the vulcanization properties,tensile tear properties,wear resistance,flexural fatigue properties,ozone aging resistance and other properties of styrene-butadiene rubber composites.The research shows that when the ratio of silica: illite is increased from0:10 to 3:7,the tensile strength of the compound increases from 3.9 MPa to 5.95 MPa,an increase of 68 %;the tear strength increases from 25.23 k N/m increased to 33.97 k N/m,an increase of 35 %.Silica blending modified illite can effectively improve the flexural properties and ozone aging resistance of styrene-butadiene rubber composites.