Shanghai Daoqin Plastics Co., Ltd.

        本文考察 三 types different structure elastomer: styrene - ethylene - butadiene - styrene copolymer (SEBS), ethylene-vinyl acetate copolymer (EVA) (EVA), ethylene -辛烯 copolymer (POE) and its maleic anhydride grafted material in year-on-year lower for nylon 6 (PA6) toughened property can effect/influence. through micro 形貌观察 and analysis comparison its effect/influence factors.

        背景 introduction

         nylon is separation 子主链 upper has heavy amine 基团-(NHCO)- thermoplastic property resin 总称, is types semi crystallization polymer, tool has wear resistance, lubricated property and heat resistant property and high strength and other excellent property can, is important engineering plastics 之一. its in nylon 6 (PA6)因 machine strong/high degree high, wear resistance strong/high, easy processing molding and other advantages, already by used for electronics electrical, automotive industrial, machine industrial and other more field/area. due to PA6存 in 自身吸 wet property strong/high, dry and low temperature impact strong/high degree low and tough property and other disadvantages, made its industrial application. therefore nylon composite/compounding modified 一直受 to 学术界 and industrial 界 广泛关注, its in through elastomer modified improve/increase nylon impact strong/high degree is main/primary 手段之一.

         elastomer modified toughened is will a small amount of elastomer and rigid property nylon 基体熔 melt blending, formed nylon is versus, elastomer pellets is dispersion versus micro structure 形貌, from make blending material impact resistant strong/high degree to improves types technology 手段. its principle in as is dispersion versus elastomer pellets 一方面 in outer force function lower can plastics generate a large amount of and belt/tape, consumption impact can amount;另一方面 dimensions relatively large pellets can control expand 展, generate belt/tape can 终止银纹, retardant its 进一步 development formed is cracks. macro upper performance is material impact resistant strong/high degree to obvious improve/increase.

         different type type elastomer due to structure and material property 差异以 and resin lubricating property different, for nylon 6 tough property improves has difference. main/primary 考察 三 types Common elastomer, styrene - ethylene - butadiene - styrene copolymer (SEBS), ethylene-vinyl acetate copolymer (EVA) (EVA), ethylene -辛烯 copolymer (POE) and its maleic anhydride grafted material in different conditions lower for nylon 6 (PA6) toughened property can effect/influence, analysis comparison in nylon toughened modified in 异同.

        实验部 separation

        1. equipment and material

        同 toward di screw extrusion machine: Model/Grade THE-35, 南京欧立 extrusion machine has company. 摆锤式 impact experiment/testing machine: Model/Grade ZBC1251-B, 美斯特 industrial. electronics micro 镜: Model/Grade S-4800, Japan day 立.

        PA6: 3280H, 巴陵石化;SEBS: G1643M, 科腾;EVA: E280PV, Hanwha TotalEnergies;POE, Engage 8150, Dow chemical. acid 酐: 天津科密欧 chemical agent has company. agent: grade TRIGONOX 101, AkzoNobel.

        2.马 acid modified elastomer made 备

        预先称取一定 amount acid add hot make its full formed liquid 体, 滤 不 solvent material. will elastomer pellets, liquid acid 酐, agent 按一定 weight ratio/proportion add high speed mixed material machine in mixed 3 ~ 5 min, rear will mixed combined material add to di screw extrusion machine in extrusion pelletizing, to for maleic anhydride grafted elastomer. extrusion machine temperature degree control in 180 ~ 220℃, speed is 300 rpm.

        3. composite/compounding toughened nylon made 备

        称取一定 amount nylon 6 resin and elastomer pellets, 按一定 weight ratio/proportion add high speed mixed material machine in mixed 3 ~ 5 min, rear will mixed combined material add to di screw extrusion machine in extrusion pelletizing to for toughened nylon material 粒. extrusion machine temperature degree control in 240 ~ 260 ℃, speed is 300 rpm.

        4. composite/compounding toughened nylon table/sheet 征

        ◆ impact strong/high degree

         will upper for toughened nylon material in 245 ℃ lower injection molding formed 缺口样 strip/profile, strip/profile dimensions long × wide × thick: 80×10×4 mm, high degree 2 mm, deep degree 1.5 mm. according to ISO 180 standards methods testing 悬臂梁 notched impact strength table/sheet tough property.

        ◆ micro 形貌

         will upper composite/compounding nylon strip/profile liquid nitrogen in 脆断, 横截面处 use hot 二甲苯刻蚀 remove elastomer dispersion versus, dry rear true 空镀铂, use Hitachi S-4800场发射扫描 electronics micro in 15 KV accelerated electrical pressure lower sample 形貌.

        结果 and 讨论

        1. different types type elastomer and its ratio/proportion for PA6 impact strong/high degree effect/influence

        SEBS, EVA and POE elastomer can as is PA6 has toughening agent, has relatively blending ratio/proportion. elastomer content low, for PA6 tough property improve/increase large, method meet/satisfy application demand;若 elastomer content high, 则会造 formed PA6 tensile strength and flexural strength degree decline, force property can effect/influence, also is resin viscosity large can 适应现 has production process. therefore solid elastomer add amount is modified plastics quality 20 %, adjustment elastomer and its for maleic anhydride grafted material ratio/proportion, comparison types elastomer in normal temperature lower for PA6 impact strong/high degree improves 效果, 结果如图1 示.

         from 图1 can 看出, if add elastomer pellets, to composite/compounding nylon impact strong/high degree relatively low. this is is 考察 三 types elastomer is non property material, 而PA6 is property material, 二者无 method blending versus 容, therefore make elastomer use amount high 达20 %, can uniform dispersion in 基体材 material in, method to toughened 效果. in this 三者当 in, pure use EVA toughened 效果稍 good, is is in EVA property most strong/high, and nylon has versus for relatively good versus property.

        随 for maleic anhydride grafted material add amount increase, composite/compounding nylon impact strong/high degree large upper rise trend, this is is acid modified rear elastomer and PA6 versus property to large improve/increase. its in POE toughened most good, in elastomer / maleic anhydride grafted material ratio/proportion is 75/25时即 tool has relatively high impact strong/high degree, increase maleic anhydride grafted material ratio/proportion toughened 效果没 has obvious reinforcement. 而EVA elastomer 则呈现先 upper rise again decline phenomenon, this can can is is maleic anhydride grafted EVA tool has relatively high crystallization degree, increase its use amount make composite/compounding material 变脆. SEBS has add pure maleic anhydride grafted material can obtain relatively good toughened 效果, causes in its in polystyrene (PS) “ hard ”链段位 retardant large, in has modified and versus property difficult dispersion 缠绕, generate relatively large negative effect/influence.

        2. composite/compounding toughened nylon micro structure

         in composite/compounding toughened nylon material in, PA6 is 连续 基体 resin, elastomer pellets is dispersion versus. is more good dispersion versus pellets in 基体位置, for composite/compounding material solvent agent 刻蚀处理. use 二甲苯 can selection property solvent understanding elastomer pellets, in electrical lower to versus and for dispersion versus structure, 如图2 示.

         in PA6 in add pure SEBS, to micro structure is 不规则 空穴(图2a), table/sheet 明SEBS in in distribution property is 不规则 pellets, 而经马 acid modified rear SEBS in in is pellets, dimensions relatively small distribution uniform (图2b). 图2c is pure POE elastomer, versus ratio 于SEBS, POE in in 呈球形 distribution, dimensions large 且不均. modified rear, elastomer pellets in in dimensions non small, distribution uniform, make rear can to obvious structure (图2d).

        进一步, statistics types elastomer in different elastomer / maleic anhydride grafted material ratio/proportion lower dispersion versus pellets dimensions, 结果如图3 示. dispersion versus dimensions large small is blending process in force and hot force balanced performance. has pure POE elastomer 时候, dispersion versus pellets dimensions versus for other types elastomer large less, causes 一方面 is modified POE and versus property 差, 另一方面 can can is raw materials viscosity relatively large, force dispersion process to retardant 碍. 随 马 acid modified elastomer add 入, dispersion versus pellets dimensions decrease small, table/sheet property acid 酐链段 promote elastomer in PA6基体 in lubricating function, make its dispersion more add uniform. this need is, dispersion versus dimensions non effect/influence composite/compounding material impact strong/high degree factors, dispersion versus material material property, dimensions distribution, material grade structure and other for impact strong/high degree generate effect/influence. for/regarding certain types specific material, in combined pellets dimensions can obtain most excellent toughened 效果. for/regarding this types elastomer 而言, dispersion versus dimensions in 0.5-0.7 μm scope/range toughened property can performance versus for relatively good.

        结论

         comparison SEBS, EVA, POE and its for maleic anhydride grafted material used for PA6 toughened for composite/compounding products impact strong/high degree effect/influence. table/sheet 明, use pure elastomer toughened, in EVA toughened 效果稍 good, maleic anhydride grafted elastomer add 入, impact strong/high degree improve/increase, comprehensive toughened 效果, in POE most excellent.

         elastomer in PA6基体 in dispersion versus dimensions effect/influence composite/compounding products impact strong/high degree, modified elastomer dispersion versus dimensions relatively large; add maleic anhydride grafted material, dispersion versus dimensions decrease small.

        三 types elastomer dispersion versus dimensions in 0.5-0.7 μm scope/range for PA6 tool has relatively good toughened 效果.