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large good, is PET, this is 我 简历!
PET plastics separation structure high degree for 称, tool has crystallization orientation can force, and has very good optical property can and weather resistance, non PET plastics has good optical transparent property . another PET plastics tool has excellent wear resistant consumption scratch property and dimensional stability and electrical insulation property.
PET做 formed bottle tool has strong/high degree large, transparent property good, 无毒, anti 渗透, quality light, production efficiency high and other 因而受 to application. main/primary from PET brief introduction, development, classification, combined formed process, modified methods, application and recycled PET七 方面进行 introduction.
一, is 土豆, is 瓜? 不, 我叫PET
large good, is PET, Scientific Names: for 苯二甲 acid ethylene glycol ester, 英文名: polyethylene terephthalatepolyethylene terephthalate. 肤 color （ appearance ）乳白 or shallow 黄, high degree crystallization polymer 时, surface slip has gloss. 天生体格健壮（ excellent material mechanical properties, long use temperature degree can 达120℃）, property low （ electrical insulation property excellent 良, in high temperature high frequency lower, its electrical property can still relatively good ）, 但受不 美女狂放 electrical （ electrical property relatively 差）. property 格像牛, as 不喊苦（ resistant fatigue ）, 摔倒不喊疼（ resistant scratch ）, is positive 义, slip （ dimensional stability very good ）.
图: PET separation structure 式
as is thermoplastic polyester 家族 一员, inner （主链 in ）含 has “-COO-” DNA separation 子（ heavy mono structure ）, is 线 property polymer. and long versus versus 近 兄弟姐妹 has less, 如: PBT, PTT, PCT, PEN, PBN and other. generally 我们担任 need 职: engineering plastics . usually 由 aromatic binary acid and various binary alcohol combined formed made. lower 图, is PET and other thermoplastic polyester property can comparison.
图: PET and other polyester comparison
from in can 看出, types polyester versus for density more, PCT稍 low 位1.23g/cm3, other polyester density 都教接近.
in PET separation in , 主链 in has 柔顺 property 亚甲基, rigid property ring and property ester 基, meanwhile ester and ring between formed 共轭 system , make PET large separation rigid property strong/high. PET separation 子主链 upper 没 has 支链, structure for 称, meet/satisfy 紧密堆砌 requirements , therefore easy 于 orientation and crystallization, 导致PET tool has high melting point, high strength .
PBT and PET versus ratio , ester heavy mono 元 亚甲基 increase is 4, flexible long degree increase, rigid property 链 占 ratio/proportion decline, separation 子柔顺 property increase. therefore, PBT rigid property, hardness, Tg（22℃） and melting point ratio PET（Tg70℃） low , tough property ratio PET high, crystallization speed rate ratio PET fast, molding processing more easy.
PTT and PET versus ratio , ester heavy mono 元 亚甲基 increase is 3 , tool has and PET versus high property can, and PBT versus excellent molding property can.
PCT and PET versus ratio , ester heavy mono is 一 ring 己烷, rigid property reinforcement , therefore PCT heat resistant property reinforcement, Tg is 82℃ ratio PET high , its long use temperature degree is 171℃.
PEN and PET versus ratio , ring by ring structure 取代, rigid property reinforcement, property relatively high, has property can excellent 于PET, long use temperature degree is 155℃.
图: PEN and PET property can comparison
PBN and PBT versus ratio , 苯 ring by ring structure 取代, tool has similar liquid 晶 features, excellent flow property.
二, formed long history （ also good is 一部血泪 history ）
三, fiber? plastics? separation 不清楚
positive 常 说, can separation is: fiber type and non fiber. as is non fiber polyester 时候, also can separation is: non engineering plastics grade and engineering plastics grade.
图: long filament
四, need from 哪里? （我偷偷告诉你）
说 to 我 由, true is 一匹布 that long. currently 说, generally through types technology 手段, by to this upper: ester method and ester 化化.
ester method : using/adopting for 苯二甲 acid ester and ethylene glycol 进行交换 reaction, rear shrink combined formed is PET.
直接 ester method : using/adopting high pure degree for 苯二甲 acid or in pure degree for 苯二甲 acid and ethylene glycol 直接 ester 化, polycondensation formed polyester
图: PET combined formed process process/workflow 图
五, modified, property （ again one-time ）
although, is currently most important combined formed material 之一, tool has 良 good heat resistant property, resistant product property, force property can and electrical property can, transparent property good, insulation property 佳,但 is, due to property comparison solid 执, 不够圆 slip , processing mold temperature （70-110℃） lower, crystallization speed rate also comparison slow, and impact resistant property can 差, also and water 搞暧昧（ easy wet ）. therefore, how to 改变我 property 格, let 我变 处事圆 slip, 四面玲珑, can 适应社会（ high tough property and rigid property, good molding ）, 一直 is 老师（ modified engineering 师）头疼 方.
图: reinforcement flame retardant PET application in tool upper
currently, main/primary modified direction has : 1. blending modified; 2. chemical modified; 3. nano machine composite/compounding modified; 4. crystallization property 改进; 5 glass fiber reinforced modified.
六, 三头六臂, upper 天入 （ application ）
说 to applications, that true is method 说完! currently, main/primary active 跃于涤纶 fiber, bottle, film and engineering plastics in its in, fiber is field/area most is active 跃, its is bottle and film and other packaging field/area, as is engineering plastics 则略显 mono thin.
1. polyester fiber
涤纶 tool has many excellent textile property can and use property can, applications 广泛, can pure textile 造, can and 棉, 毛, filament, and other 天然 fiber and other chemical fiber mixed 纺交织, made formed color more, 坚牢挺括, easy easy dry, and can property can good 仿毛, 仿棉, filament, 仿麻织 material;
use made as 无 textile 布 can used for inner decoration material, carpet 底布, industrial use 布, 絮绒, and other.
2. polyester non fiber type
currently, non polyester main applications in bottle tool, film sheet/slice and engineering plastics upper.
as is bottle tool , its light, transparent degree high, heat resistant, resistant pressure, for/regarding oxidation carbon gas has retardant property;
as is film , usually color transparent, has gloss （ additives pellets make its tool has color ）, mechanical properties excellent 良, rigid property, hardness and tough property high, resistant 刺, resistant temperature, gas property and property good, is commonly used retardant property composite/compounding film 基材之一;
as is engineering plastics , generally add 入5-40wt% GF, reinforcement rear PET mechanical properties and thermal properties to relatively large improve/increase, in electronics electrical, automotive, machine 械, light 工, construction, national defense and day active and other field/area to application.
图: PET bottle 子
七, heavy 生（ recycled PET）
in recent years, 随 recycled polyester processing technology 改进, product quality improve/increase, recycled polyester recycling utilizing rate large degree improves . recycled type 特本白 short 纤, 三维卷曲 in 空, recycled long filament and other already separation 占领 原生 polyester product market; PET waste plastics bottle recycling in day increase large, in 一定程 degree upper reduce separation PET alloy price, for textile, packaging industry or more or less has effect/influence.
图: PET标号
temperature 馨提示:
Common 于矿泉 water bottle, carbon acid material bottle and other. temperature degree to 70℃时 easy deformation, has for has material melt. 1号 plastics product （PET bottle 子） use 10 month rear, can can 释放出致癌 material DEHP. this category of bottle can in automotive inner cationic, high temperature lower can 装酒, and other material 质.
