四川大学高分子专业外语PPT.ppt

Acrylonitrile Butadiene Styrene(ABS)1st team 8th homework by XuWHAT IS ABS resin?ABS resin usually refers to the graft copolymer of polybutadiene rubber and styrene monomer and acrylonitrileAmong it,A represent Acrylonitrile,providing chemical resistance and thermal stabilityB represent Butadiene,providing toughness and resistanceS represent Styrene,providing rigidity and workabilityPhysicochemical propertiesABS resin is tiny yellow solid,with a certain toughness,density of about 1.041.06 g/cm3.It has a strong ability to resist acid,alkali and salt.,and tolerance to organic solvent in a certain extent.ABS resin can be normal in the environment of-25 60,and has a good formability,the surface of the product is smooth and easy to be dyed and electroplating.Therefore,it can be used for household electrical appliances,toys and other daily necessities.Common Lego building blocks are ABS products.ABS resin and a variety of resin hybrid blends,such as PC/ABS,PVC,PA/ABS,ABS and other produce new properties and new application fields.Such as,ABS resin and PMMA Hybrid,can create a transparent ABS resin.Quality indexDensity：1.031.07g/cm3Impact strength：186330J/mTensile strength：3449MPaHardnessR)：62118Elongation：20%40%Volume resistivity：(1.053.60)1016.cmBending strength：5978MPaMartin heat resistance：74-85Product performanceABS resin has appearance of micro yellow opaque,relative density of 1.04.It has good dimensional stability,outstanding impact resistance,heat resistance,dielectric properties,wear resistance,good surface gloss,easy coating and coloring,etc.ApplicationApplies to household appliances,such as TV sets,refrigerators lined,vacuum cleaners,etc.,as well as the instrument,telephone,automotive industry with plastic products.Production methodABS resin is the raw material of butadiene,styrene and acrylonitrile.Via emulsion polymerization process of polybutadiene latex,then the latex with styrene and acrylonitrile by emulsion graft copolymerization,of ABS powder.AS(SAN)emulsion was prepared by suspension polymerization.ABS powder,SAN milk powder and a variety of additives are mixed in a certain proportion,the extrusion granulation,and ultimately get ABS resin productsAdvantageImpact resistanceheat resistancelow temperature resistancechemical resistancePackaging and storagePolypropylene film woven bag packaging,net weight 25kg/bag.Can be used by car,train,ship,etc.The process of storage and transportation should be waterproof,dustproof,fireproof,sunscreen,anti pollution etc.Storage should be placed in a dry,well ventilated warehouse,to prevent direct sunlight exposure,should not be open to storage,product should be separated from the pile up.Should not be stored or shipped with chemicals and flammable materials.It is one of the most rapidly developing varieties of styrene resin,and ABS resin is one of the largest and most widely used polymer blends.Not only has the excellent mechanical properties of tough,hard and rigid,but also has excellent chemical resistance,dimensional stability,surface gloss,low temperature resistance,stain resistance and processing performance.ABS resin has been developing extremely rapidly since 1947.In the world,the annual demand of ABS resin increases with the speed of 5%8%.In our country,the annual demand is growing at a rate of 15%.ABS resins are generally opaque,the appearance of a pale ivory,with any color;ABS non-toxic,non smelly,tough,hard,a rigid and has good resistance to temperature and creep resistance;ABS waterproof,normal temperature water absorption rate less than 1%,the surface can be polished;ABS with excellent mechanical properties,excellent impact strength can used at very low temperatures;ABS excellent wear resistance,good dimensional stability,but also has oil resistance,can be used for medium load and speed of the bearing.The creep resistance of ABS is higher than that of PSF and PC,but it is smaller than POM and PA.The bending strength and compressive strength of ABS are poor.The mechanical properties of ABS were influenced by temperature.The thermal deformation temperature of 93118 is ABS,and the product can be improved about 10 after annealing treatment.ABS can show a certain degree of toughness at-40,which can be used in the temperature range of-40100.The electrical insulation of ABS is good,and it is almost not influenced by temperature,humidity and frequency,which can be used in most circumstances.ABS is not affected by water,inorganic salt,alkali and influence of various acids,but soluble in ketones,aldehydes and chlorinated hydrocarbon,glacial acetic acid,vegetable oil,etc.erosion will produce stress cracking.ABS has poor weather resistance,which can be easily produced under the action of ultraviolet light.After half a year,the impact strength is reduced by half.ABS same as PS is a kind of high performance thermoplastic,can be processed by common processing method.The melt flow property of ABS is better than that of PVC and PC,but is similar to that of PE,PA and PS,and is similar to POM and HIPS,and the flow property of ABS is non Newton fluid,and its melt viscosity has a relationship with processing temperature and shear rate,but is more sensitive to shear rate.The thermal stability of ABS is good,and is not easy to be degraded.The water absorption rate of ABS is high,and the drying process should be carried out before processing.The drying conditions for the general products are 8085,24h,and the drying conditions for the special requirements of the products(such as electroplating)are 7080,and the time is 1818h.ABS products in the process of easy to produce the internal stress,the size of the internal stress can be tested in the ice acetic acid,such as stress is too large and the product of the corresponding force cracking is absolutely prohibited,should be annealed,the specific conditions for the hot air circulation drying oven 7080 24h,then cooling to room temperature.ABS resin is usually a mixture of polybutadiene styrene and acrylonitrile graft copolymer of styrene acrylonitrile free copolymer(SAN).Among them,graft in polybutadiene rubber styrene and acrylonitrile graft copolymer for polybutadiene rubber and San resin provides good compatible interface,forming a stable two phase structure.ABS resin containing phenyl side,cyano and unsaturated double bonds make ABS and many polymers have good compatibility,the ABS resin by blending modification has created favorable conditions.For this purpose,a wide variety of ABS alloys have emerged as a result of the different materials and ABS blends to obtain satisfactory performance.At present,the types of ABS alloy have reached dozens of species,and from two yuan to three yuan,diversified development.In the middle of 1920s,the use of bulk or solution precipitation method in the presence of natural rubber in the preparation of anti-impact modified polystyrene technology has emerged.By 1950s,the suspension method,emulsion method,bulk polymerization process are used for high anti-impact polystyrene(HIPS)or acrylonitrile-butadiene-styrene copolymer(ABS)synthesis.In 1957,the Wamer Cycolac Borg-series ABS series emulsion grafting method was pushed to the market and quickly became the leading product.20 years later,a series of MAGNUM ABS USA Dow chemical company production of bulk market.In 2002,Dow chemical company,the range of ABS global production capacity of 5.1%of the worlds total production capacity of ABS.It is clear that the ABS ontology method can not completely replace the emulsion process,that is,the limitations of the former to prevent the development of the former.The early ABS resin by blending method,generally 70 of styrene acrylonitrile copolymer and 40 nitrile rubber mixture.At present,the industrial production of ABS resin by emulsion grafting method is obtained in polybutadiene latex of styrene monomer and acrylonitrile graft.Various components of the use of ABS to produce a different role:the main chemical resistance and thermal stability of acrylonitrile,butadiene provides toughness and impact strength,styrene is given a good rigidity and processing ABS.ABS plastic molding temperature is 180250,but it is best not more than 240,then the resin will be decomposed.Domestic developmentDomestic ABS resin market demand mainly concentrated in the field of electronic appliances,office automation,toys,etc.,along with the development of electronic computers,automobiles,transportation and other industries,the future of ABS resin consumption growth will show rapid development trend,but also for ABS resin properties and variety of products will be favored by the market,especially refrigerators with ABS board,electronic computer and automotive instrument panel will become the market demand for the fastest growing varieties.Thanks for watching