| Rubber is widely used in the field of automobile tire manufacturing due to its excellent wear resistance,recovery performance,processing performance,good elasticity and inflatability.In the field of automobile tires,because the spare tire is placed in the car interior,so it has the closest relationship with the passengers.However,Volatile organic compounds(VOCs)in tire rubber will continue to volatilize into the cab,threatening the health of passengers.Therefore,a new type of low-VOCs tire rubber is urgently needed to solve the impact of spare tires on indoor air quality of automobile.The prerequisite for reducing VOCs in tire rubber is the need for accurate detection of VOCs.GC-MS technology has the advantages of high throughput,high sensitivity,high separation ability,etc.,and is widely used in the detection and research of volatile organic compounds.This paper is based on the detection and traceability of tire rubber VOCs based on gas chromatography tandem mass spectrometry,and continuously improves the rubber formula to reduce tire rubber VOCs.The results achieved are as follows:(1)Developed ultrasonic assisted solvent extraction method and headspace sampling method combined with GC-MS to screen VOCs in tire rubber.As a result,a total of 38 substances were screened,including 28 VOCs and 10 SVOCs.Combined with the toxicity,content and odor characteristics of VOCs,there are 6 substances of high concern:phenol,benzothiazole,2,2,4,6,6-pentamethyl-3-heptene,2,4,4-trimethyl-1pentene,1,2-dihydro-2,2,4-trimethylquinoline and p-tertylphenol.In order to explore the source of volatile organic compounds,the raw materials for refining tire rubber were collected,and the raw materials were analyzed under the same conditions.The possible pathways for the production of VOCs from tire rubber were speculated and the source of volatile organic compounds was determined.(2)In order to improve the tire rubber formula and obtain low VOCs tire rubber,firstly,the VOCs of different types of raw materials were analyzed and compared through UASE-GC-MS,and the formula was optimized through the gradual replacement of raw materials to reduce the VOCs of tire rubber..The results found that natural rubber 3L,tackifying resin C and accelerator TBzTD are more conducive to the reduction of tire rubber VOCs.The quantitative results of low-VOCs tire rubber TVOC show that the VOCs content is 0.007mg/g,which is 42.89%lower than the original tire formula.The mechanical properties of low-VOCs tire rubber hardness,tensile strength,elongation at constant elongation were tested,and the results showed that the mechanical properties have increased to varying degrees,which meets the requirements of tire manufacturers for tire rubber.The release of VOCs during tire placement was further investigated,and it was found that tire rubber VOCs volatilized more within 50 hours,and the VOCs content of rubber gradually stabilized after 50 hours,which has guiding significance for tire storage time of tire manufacturers.(3)In order to develop the utilization of the residues after extraction of Eucommia gum,Eucommia resin obtained by extracting residues with ethyl acetate was added to rubber.It was found that Eucommia resin can provide plasticization and a certain anti-aging effect,so it was passed through GC-MS The relationship between the composition of eucommia resin and the change of rubber mechanical properties was analyzed,and some effective components of eucommia resin were quantitatively analyzed.Through HS-GC-MS,the VOCs content of three types of rubbers containing no plasticizer,containing eucommia resin and containing coumarone resin were compared.The results show that eucommia resin can improve the VOCs content of rubber to a certain extent,especially acetone and benzene.The two substances of ethylene were reduced by 27%and 21%respectively. |
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