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车灯 plastics that 事儿—— performance, application large analysis
一, plastics features
automotive lighting light types type more, as is automotive outer lighting 灯. automotive main/primary separation is front 灯, use 灯, wide and 转弯时 used for lighting 曲线灯以 and direction 指示灯; rear has 刹车灯, direction 指示灯 and other.
以往车灯材 material using/adopting 玻璃材 material and metal material, due to this comprehensive property can relatively 差, therefore, selection plastics 做车灯材 material, not only processing properties excellent, impact strong/high degree property can 佳, light, density small, also can make in design upper more add active, 风格趋于现代化.
lower 面, to large furniture introduction about/regarding plastics property can comparison.
1. property can comparison
首先, to large 家先看 lower, below/following types material property can comparison:
table/sheet 1:
|
PBT |
PBT/PET +20MD |
PC |
||
|
Density density |
O |
— |
+ |
+ |
|
Material price price |
+ |
++
|
+ |
— |
|
Themal stability resistant thermal properties |
+
|
+ |
++ |
O |
|
Metal adhesion plating viscous force |
++
|
++ |
+ |
O |
|
Processing processing （ flow property ） |
++ |
++ |
+ |
O |
|
Irisation发 color 情况 |
+ |
+ |
O |
— |
|
Water uptake吸 water property |
++ |
++ |
—— |
++ |
|
Primer system has coating |
N |
Y |
Y |
N |
|
Quality of Metallization electroplating |
++ |
++ |
+
|
O |
|
Max Service Temp temperature degree |
＜200 |
＜180 |
＜180 |
＜125 |
注: + excellent ++ especially excellent — disadvantages —— especially disadvantages
O普通 Y need N不 need
table/sheet 2:
|
PC-HT |
BMC |
PEI |
|
|
Density density |
+ |
— |
O |
|
Material price price |
—— |
++ |
—— |
|
Themal stability resistant thermal properties |
++ |
++ |
++ |
|
Metal adhesion plating viscous force |
O |
+ |
+ |
|
Processing processing （ flow property ） |
O |
+ |
+ |
|
Irisation发 color 情况 |
++ |
++ |
++ |
|
Water uptake吸 water property |
++ |
||
|
Primer system has coating |
N |
Y |
N |
|
Quality of Metallization electroplating |
O |
++ |
+ |
|
Max Service Temp temperature degree |
＜200 |
＜220 |
＜200 |
注: + excellent ++ especially excellent — disadvantages —— especially disadvantages
O普通 Y need N不 need
图1
由 table/sheet 1, table/sheet 2, and 图1 can understanding to various plastics property can comparison. different material, property can is has 差异. therefore, in meet/satisfy technology conditions front lower, combined 适做车灯 材 material less, different manufacturing 厂家, for price can force 不一样, manufacturing 车灯档次 different, technology processing degree different, therefore selection 也不一样.
lower 面, to large detailed introduction types plastics features, disadvantages and applications:
|
材 material |
特 property |
缺 点 |
use 途 |
|
ABS acrylonitrile-butadiene-styrene (ABS) copolymer |
low specific gravity low cost excellent formed property heat resistant property (up to 85℃) |
resistant chemical property, outer weather resistance good
|
信号灯 housing/shell 体 automotive trim parts 三角警示牌 upper, lower parts |
|
PC polycarbonate (PC)
|
transparent property / color stability property excellent impact strong/high degree dimensional stability flame retardant property heat resistant property |
熔 melt viscosity high 缺口效应 应 force 敏感
|
front 照灯, 信号灯 lamp covers front decoration frame 信号灯 housing/shell 体
|
|
PC+ABS polycarbonate (PC) + acrylonitrile-butadiene-styrene (ABS) copolymer |
formed property low temperature tough property excellent impact strong/high degree heat resistant property (up to 120℃) |
resistant chemical property
|
信号灯, inner housing/shell 体 三角警示牌 upper, lower parts |
|
modified PP filling polypropylene (PP)
|
吸 water property small resistant chemical stability property strong/high degree, rigid property relatively good in 110~120℃ lower long use |
low temperature property, 尖脚容 easy generate force in wear resistant formed shrinkage rate large |
filling modified rear, front 照灯, inner housing/shell 体
|
|
PMMA polymethyl methacrylate (PMMA), has machine 玻璃
|
透 light property good 容 easy color 容 easy formed 形 resistant property good |
质 脆 easy solvent has machine solvent agent surface hardness 差
|
信号灯 lamp covers 车身反射 device
|
|
PBT polybutylene terephthalate (PBT)
|
resistant chemical property heat resistant property (up to 225℃) resistant scratch property / abrasion consumption property fatigue resistance |
缺口敏感 property shrinkage rate / warpage large
|
front decoration frame
|
|
PEI/PES polyetherimide (PEI) / polyether 砜
|
resistant chemical property heat resistant property 完美 self-extinguishing property transparent property can more use |
缺口敏感 property color made
|
front decoration frame, 反射镜
|
|
filling PPS filling polyphenylene sulfide (PPS)
|
resistant chemical property self-extinguishing property fatigue features high flow property high heat resistant property (up to 260℃) |
缺口效应敏感
|
filling modified rear, front 照灯, front 雾灯反射镜
|
|
PA polyamide (PA), Common has PA6, PA66
|
machine strong/high degree high wear resistance good high flow property, suitable for thin product oil resistant, chemical solvent agent |
吸 water property strong/high, filling reinforcement rear has improvement
|
filling modified rear, inner 灯线路 sheet/plate filling modified rear, 信号灯灯 base/seat
|
|
POM polyoxymethylene (POM)
|
strong/high degree, rigid property, impact property can relatively high fatigue resistance, wear resistance high dimensional stability good 吸 water property small cost low |
add hot easy separation understanding formed shrinkage rate large formed difficult
|
调 light 螺母, gears and other machine parts
|
|
BMC, Bulk Molding Compound 团状模 plastics
|
dimensional stability good 线膨胀系数 relatively small resistant thermal properties excellent, 230℃ above |
difficult separation understanding, can recycling in utilizing
|
front 照灯, front 雾灯 反射镜
|
through upper plastics property can table/sheet 格, 我们应该也 can understanding to, to which material combined use 做车灯.
二, specific structure in plastics application
lower 面, small again to large introduction several specific structure parts application:
1. front 灯:
图3
technology requirements :
1） dimensional stability, wet speed degree slow
2）一定 force strong/high degree
3） excellent resistant aging property can
4） surface quality high
5) demolding property can good
实例1:
实例2:
2.雾灯
图4
technology requirements :
1） dimensional stability
low moisture absorption rate: small 于0.8 %•
low CTE (thermal expansion coefficient): 5.5×10*(-5)/K
low shrink rate: 0.6 – 0.7 %
不因 crystallization generate warpage deformation
high heat deflection temperature (HDT) (HDT A/B):195 / 218℃
2）无疵 surface, can use coating 直接镀 aluminum
无 obvious can 见熔接痕 and flow marks
无 shrink 印
surface high gloss
3） excellent degree property can
4） high impact resistance property can
5） heat resistant aging
实例1: micro type 巴士
实例2: 起亚
