关于耐高温材料PPA的性能
聚磷酸铵化学试剂

聚磷酸铵化学试剂
聚磷酸铵是一种常用的化学试剂,也称为PPA,它的化学式为(NH4PO3)n。
它由重铵盐和磷酸反应生成,可以用作消防灭火剂、阻燃剂、粘合剂、晶体生长改性剂等。
聚磷酸铵的基本性质:
外观:白色粉末
相对分子质量:(NH4PO3)n
熔点:180-200℃
密度:1.9
热稳定性:不溶于水,在水中不稳定,易水解为磷酸和铵盐。
1.防火材料:
由于聚磷酸铵的磷酸基团可以形成玻璃状化合物,在受到高温时可以抑制燃点的提高
和物质的燃烧。
因此,PPA可以用作一种有效的阻燃剂。
2.水处理剂:
聚磷酸铵可以用于水处理中的软化剂和缩小膨胀剂,在水中可以与钙、镁离子形成不
溶的盐类,从而防止硬水的产生。
聚磷酸铵可以用于表面处理剂,在金属表面形成一种保护膜,起到防腐、防锈、防蚀
等作用。
4.其他用途:
聚磷酸铵还可以用作粘合剂、晶体生长改性剂、填料等。
在生物医药领域,聚磷酸铵
也有着广泛的应用,可以作为细胞生长材料和药物缓释的载体。
总之,聚磷酸铵是一种很重要的化学试剂,可以应用于许多领域,是很实用的阻燃剂、水处理剂、表面处理剂和粘合剂。
由于其在生物医药领域的广泛应用,还具有很大的发展
前景。
Solvay Amodel高温PPA材料技术简介说明书

Quick Guide to Injection Molding High Heat Amodel® polyphthalamide (PPA)Solvay manufactures and markets an extensive rangeof high-performance thermoplastic polymers that offer superior thermal resistance and dimensional stabilityin hot, aggressive environments vs. other engineering polymers. Amodel® polyphthalamide (PPA) is a family of semi-crystalline, thermoplastic polymers that bridge the cost-performance gap between traditional engineering thermoplastics – such as polycarbonate, polyamides, polyesters, and acetals – and higher-cost specialty polymers – such as liquid crystal polymers, polyphenylene sulfide, and polyetherimide.End-use temperatures for the markets served by Amodel® PPA continue to evolve upward, creating a need to enhance the thermal performance of these materials. In response to this, Solvay developed a family of Amodel® High Heat (HH) PPA injection moldable resins that offer robust resistance to temperatures in the range of 215 °C to 230 °C (419 °F to 446 °F).Detailed design and processing information is available at . The purpose of this document is to supplement this content with information that is specific to the Amodel® HH PPA family of products. EquipmentHigh Heat Amodel® PPA resins can be processedon conventional injection molding equipment.• Estimated clamp tonnage of 5.5 kN/cm2 (4 T/in2 ) is required.• Standard (general purpose) screws with a compression ratio between 2.5 : 1 and 3.5 : 1 and a L/D (length todiameter) ratio between 18 : 1 and 25 : 1 are suggested.• Use a ring-check valve, not a ball-check valve.• Use an open reverse taper nozzle to minimize drooling or freeze off. Shut-off nozzles are not acceptable.• Use insulation plates between the mold and machine platens.• Use a mold temperature control unit with oil to attainadequate mold temperatures.• When using oil heaters, ensure that lines, seals, and heat transfer fluids are suitable for theprocessing temperatures.• Use a desiccated hopper dryer to ensure that the resin remains dry during processing.• Select a barrel capacity for a residence time no greater than 6 minutes. In general, if the shot sizeis between 30 % and 70 % of the barrel capacity,the residence time will be acceptable. An indicationof the residence time is given by:= 2 xShot Size x 60xBarrelCapacityCycle Time,Seconds Residence Time,Minutes• Hot runner systems are not recommended for use with the High Heat Amodel® PPA resins.• Residence times in excess of this recommendation may result in polymer degradation (as witnessed byexcessive drooling) or difficulty in filling the cavity.In any multi-cavity mold, a balanced cavity arrangement is critical to molding quality parts. This means that all of the cavities must contain the same volume and fill at the same time. An unbalanced mold will over-pack some cavities while others are under-packed. A balanced mold fills all cavities at the same rate with the same pressure, ensuring uniform parts. Usually, this is accomplished by placing the cavities equidistant from the sprue with identically sized runners. The flow path should be the same length to each cavity. The use of “family” tools is NOT recommended.Table 1: Drying time at 120°C (248°F), hoursRelative Humidity [%]Elapsed Time from Container Opening [Hours]0.250.512330 4.5 5.0 5.5 6.0 6.5 50 5.0 5.5 6.07.07.5 75 5.0 5.5 6.57.58.0 100 5.5 6.57.58.59.0Table 2: Starting point molding conditionsParameter Units Amodel® A-4000 HH SeriesDrying temperature[°C (°F)]120 (248)Drying time [hours]4Target melt temperature[°C (°F)]330 – 345 (626 – 653)Barrel temperatures[°C (°F)]Rear zone315 (599)Middle zone320 (608)Front zone325 (617)Nozzle temp. (2)[°C (°F)]325 (617)Mold temp. [°C (°F)]> 80 (176)Injection speed HighFill time[seconds] 1 – 2Injection pressure[bar (ksi)]700 – 1,500 (10 – 22)Hold pressure (3)[bar (ksi)]350 – 800 (5 – 12)Hold time (4)[seconds/mm]1Back pressure[bar (psi)]< 5 (72)Screw speed[m/s (rpm)]< 0.3 (150)(1) Air used for drying must have a dew point below – 40 °C (– 40 °F)(2) Adjust downward if drooling occurs(3) Normally applied at 95% of screw forward position and at 50% of injection pressure(4) Calculate hold time in seconds by multiplying seconds/mm by maximum part thickness in mmDryingResin should be dried before molding because excessive moisture will result in nozzle drool, reduced mechanical properties, poor surface appearance, and sprue sticking. Extremely wet resin will result in a foamy extrudate.The target moisture level is 0.03 % to 0.06 % (300 ppmto 600 ppm) and the maximum recommended drying temperature is 135 °C (275 °F).Although Amodel® PPA resins are shipped with less than 0.15 % moisture and packaged in moisture-proof foil-lined bags or boxes, the resin should be dried for optimum molding results. The preferred drying condition is 4 hours at the temperature shown in Table 2. Alternatively, the resins can be dried for 8 hours at 90 °C (194 °F). In either case, a desiccant bed dryer with a dew point below– 30 °C (– 22 °F) should be used.Drying Tips:• Do not open containers until ready to process.• Drying at temperatures higher than 125 °C (257 °F) may result in the darkening of natural colored pellets.• If a thermogravimetric moisture analyzer is used, it should be set to 180 °C (356 °F).• Amodel® PPA resin in an open container needs to be dried as shown in Table 1. The recommended drying time depends on how long the container has beenopen and the estimated relative humidity. Molding Cycle SettingsInjection• Injection of the resin should be controlled by velocity and position.• Pressure and timer settings should be high enough to allow velocity and position control.• Transfer to holding pressure when the part is approximately 95 % full.• Injection velocity profiling can minimize the possibility of burn marks and other part defects.Packing/Holding (Second Stage Pressure)• Packing/holding is controlled by pressure and timer settings.• Packing/holding pressure is typically set at one-half of the maximum injection pressure.• Packing/holding pressure can be varied up or down to compensate for flash or short shots.• Packing/holding pressure should be applied until the gate is frozen.• Gate freeze-off time can be found by determining the minimum time required for achieving maximumpart weight.• If packing/holding pressure is removed before the gate is frozen, irregular part shrinkage or warpagemay occur.Cooling• Cooling time should be just long enough to recover the screw and eject the part without deformationdue to ejector pins.• Refer to Table 2 for appropriate screw speeds and back pressure settings.• A screw delay can be used to match end of screw recovery with mold opening.TroubleshootingTable 3 is a troubleshooting guide that contains the solution to many common molding problems. If problems persist, contact your Solvay representative for additional assistance and technical service.T a b l e 3: T r o u b l e s h o o t i n g g u i d e f o r H i g h H e a t A m o d e l ® P P AP r o c e s s P a r a m e t e r s T o o l i n g a n d E q u i p m e n tP r o b l e mE n s u r e r e s i n d r y n e s sB a c k p r e s s u r eB a r r e l t e r m p e r a t u r eC o o l i n g t i m eC u s h i o nH o l d p r e s s u r e a n d t i m eI n j e c t i o n p r e s s u r e I n j e c t i o n s p e e dM o l d t e m p e r a t u r eN o z z l e t e m p e r a t u r eS c r e w r e c o v e r y s p e e dS h o t s i z eC a v i t y v e n t i n gI n c r e a s e c l a m p p r e s s u r eI n c r e a s e d r a f tI n c r e a s e g a t e s i z eC h a n g e g a t e l o c a t i o nC l e a n a n d p o l i s h m o l dI n s u l a t e n o z z l eU s e r e v e r s e t a p e r n o z z l eP o l i s h s p r u e b u s h i n gC o m m e n t sB r i t t l e p a r t s – w e t r e s i n 1 +M a x i m u m m o i s t u r e 0.10 %B r i t t l e p a r t s – c o l d r e s i n2 +1 +5 +6 +7 +3 +4M i n i m u m m o i s t u r e 0.03 %B r i t t l e p a r t s – d e g r a d a t i o n 2 –1–4 –5 –3 –R e d u c e r e s i d e n c e t i m eB u r n m a r k s 4 +5 –2 –3 –7 –6 –1 +89V e n t s 0.03 m m t o 0.06 m mE j e c t o r m a r k s1 +4 –3 –2 –56F l a s h4 –3 –2 –5 –1F l o w l i n e s 5 +1 +2 +3 +4 +J e t t i n g3 –2 –1K n i t l i n e s4 +6 +2 +3 +5 +1N o z z l e d r o o l s 2 +5 –4 –7 –8 –1 –6 –3N o z z l e f r e e z e s3 +4 +1 +25R e t r a c t i n j e c t i o n u n i tP a r t s s t i c k5 +3 –2 –6 ±71D o n o t o v e r p a c kP l a t e o u t o n t o o l , v e n t s 2 +5 –4 –7 –3 –6 –1 +S c r e w r e c o v e r y 1 +2 ±4 ±3 ±C h e c k s c r e w f o r w e a rS h o r t s h o t s4 +2 +3 +6 +1 +7 +5S i n k m a r k s4 +1 +3 +2 +5S p l a y m a r k s 1 +3 –4 +2S p r u e s t i c k s3 +1 –2 –4 +65D o n o t o v e r p a c kS u r f a c e p o o r4 +3 +2 +1 +65V o i d s4 +1 +3 +2 +5W a r p a g e3 +2 +1 +4+54A p p l y t h e r e m e d i e s i n n u m e r i c a l o r d e r : + I n c r e a s e , – D e c r e a s e , ± I n c r e a s e o r D e c r e a s eS********************************| Europe, Middle East and AfricaS pecialtyPolym ers.Am*****************| AmericasS pecialtyPolym*******************| Asia PacificSafety Data Sheets (SDS) are available by emailing us or contacting your sales representative. Always consult the appropriate SDS before using any of our products. Neither Solvay Specialty Polymers nor any of its affiliates makes any warranty, express or implied, including merchantability or fitness for use, or accepts any liability in connection with this product, related information or its use. Some applications of which Solvay’s products may be proposed to be used are regulated or restricted by applicable laws and regulations or by national or international standards and in some case s by Solvay’s re comme ndation, including applications of food/fe e d, wate r tre atme nt, me dical, pharmace uticals, and pe rsonal care. Only products designated as part of the Solviva family of biomaterials may be considered as candidates for use in implantable medical devices. The user alone must finally determine suitability of any information or products for any contemplated use in compliance with applicable law, the manner of use and whether any patents are infringed. The information and the products are for use by technically skilled persons at their own discretion and risk and does not relate to the use of this product in combination with any other substance or any other process. This is not a license under any patent or other proprietary right. All trademarks and registered trademarks are property of the companies that comprise the Solvay Group or their respective owners.Purging and Machine Shutdown Purging is the process of replacing the resin in the barrel with another resin that is typically more thermally stable. Purging is required for routine shut-down and start-upof the molding machine. Use of a water bath is recommended to limit any smoke or odor generated during purging; as the melt patty is generated, it can be drawn and quenched in the water bath.High-density polyethylene (HDPE) with a melt flow rate less than 1g/10 min is effective for purging Amodel® PPA resin. Purging materials such as Asaclean® EX/SX/UX or Dyna-Purge® E may be used for more thorough abrasive or chemical cleaning.During normal operations, purging is recommended when a process upset occurs:• If the molding cycle is interrupted for 5 to 9 minutes, the barrel should be purged of at least three shots.• If the molding cycle is interrupted for 10 minutes or longer, completely remove the Amodel® PPA resin from the machine by purging with a suitable HDPE.For more extended shutdowns, the standard procedure for purging Amodel® PPA resin is:• Shut off the resin feed at the hopper throat.• Move the barrel carriage away from the sprue bushing, increase local ventilation, and install purge barrier.• Purge the screw until the barrel is empty of resin.• Add HDPE to the feed throat and purge the barrel until the purge runs clean.• Reduce barrel heater settings.Safety proceduresProper safety procedures must be followed at all times:• All machine guards and covers must be in place.Required personal protection equipment must beworn. Face shields, gloves, and long sleeves arerecommended. Purge barriers should be placedagainst the sprue bushing to protect the tool. Purged materials are very hot and should be handled anddisposed of with care.• Always be alert to the possibility that resin decomposition can occur. Typical signs of resindecomposition include badly discolored resin purge and excessive gas generation. When resindecomposition is suspected, assume that gas athigh pressure is present and take appropriate action to prepare for the release of high-pressure gas. Be particularly cautious with plugged nozzles and follow all established safety guidelines.。
ppa是什么材料

ppa是什么材料
PPA是什么材料。
PPA,全称为聚苯醚酮,是一种高性能工程塑料,具有优异的耐热性、耐化学腐蚀性和机械性能,被广泛应用于汽车、电子、航空航天等领域。
在本文中,我们将探讨PPA的特性、用途以及在工业生产中的重要性。
首先,PPA具有出色的耐热性能,其熔点高达320摄氏度以上,能够在高温环境下保持稳定的物理性能,因此被广泛应用于汽车引擎盖、进气歧管等高温部件的制造。
同时,PPA的耐化学腐蚀性也非常突出,能够抵御酸、碱等化学物质的侵蚀,因此在化工设备、电子元件等领域有着重要的应用价值。
其次,PPA具有优异的机械性能,具有较高的强度、刚性和耐磨性,能够满足复杂工程环境下的使用要求。
因此,在航空航天领域,PPA被广泛应用于飞机发动机零部件、航空航天设备等重要部件的制造,其稳定的物理性能和可靠的机械性能为航空航天领域的发展提供了重要支持。
此外,PPA还具有良好的加工性能和成型性能,能够通过注塑、挤出等工艺制造成各种复杂形状的零部件,为工业生产提供了便利。
同时,PPA的绝缘性能也非常优秀,能够应用于电子元件、电气设备等领域,保障设备的安全稳定运行。
总的来说,PPA作为一种高性能工程塑料,在汽车、电子、航空航天等领域有着广泛的应用前景,其优异的耐热性、耐化学腐蚀性和机械性能为工业生产提供了重要支持。
随着科技的不断进步和工程塑料技术的不断发展,相信PPA在未来将会有更广阔的应用空间,为各个领域的发展带来更多的可能性。
PPA塑胶原料

PPA塑胶原料PPA塑胶原料资料由友人塑胶提供塑胶热线:TEL 136 **** ****聚邻二酰胺(简称PPA)树脂是以对二甲酸或邻二甲酸为原料的半芳香族聚酰胺。
PPA比聚酰胺刚性要好,吸水小,热性能好,能耐化学品。
PPA既有半结晶态的,也有非结晶态的,其玻璃化温度在255°F左右。
非结晶态的PPA主要用于要求阻隔性能的场合;半结晶态的PPA树脂主要用于注塑加工,也用于其它熔融加工工艺下文主要介绍后者——半结晶态PPA树脂,特别注明的除外。
半结晶态PPAS的熔点约590°F,以不透明矩形切片的形式供应。
在高温高湿状态下,PPA的抗拉强度比尼龙6高20%,比尼龙66更高;PPA材料的弯曲模量比尼龙高20%,硬度更大,能抗长时间的拉伸蠕变;且PPA的耐汽油、耐油脂和冷却剂的能力也比PA强;一种耐高温尼龙,这种材料可以耐200℃的持续高温,并且还能保持良好的尺寸稳定性。
PPA性能描述:改性聚对二酰对二胺(PPA)塑料的热变形温度高达300℃以上,连续使用温度可达170℃,能满足您所需的短期和长期的热性能。
它可在宽广的温度范围内和高湿度环境中保持其优越的机械性特性—强度、硬度、耐疲劳性及抗蠕变性。
增韧吕级PPA结合优越的韧度与一定范围的硬度和柔性,在扣件中要求一次性使用的刚性、以及重复性使用中挠屈性的良好选择。
同时提供特殊品级的产品应用于可喷涂和可电镀的表面,防火性、耐乙二醇性及反身性要求的应用。
主要特性:☆PPA强度、韧度和硬度优越性能,以及其良好的耐热件,耐化学性及抗开裂能力☆PPA由于高温和高湿环境下仍能保持强度和硬度,可在传统的尼龙和聚酯所无法随的就用中替换金属☆PPA塑料还具有优越的表面光泽性。
可以对其进行着色而避免了表面喷涂,从而有助于降低表面划痕和刮痕的明显程度。
☆PPA塑料还具有良好的可加工性,并允许短的注塑循环时间与PA46相比:√PPA具有比PA46更高的热稳定性;√PPA具有比PA46更好的CTI/耐电弧能和红外同流能力;√PPA具有比PA46更好的耐化学性;主要应用:☆汽车部件,包括燃油、传动及发动机系统,可减轻重量、降低成本并提供长时间的使用寿命;☆芯片组和插座、杯体焊接支座;☆片状电容器、开关及微型喇叭、制作高密度的印刷电路板连接器;☆用于耐磨要求极高的场合,例如无润滑轴承、密封、轴承隔离环和往复开压缩机零件;☆连接器、控制器、传感器、马达及其它关键电子部件;以PPA为原料加工的PPA助剂,应用广泛而有效。
原料PPA特性

PPA是高温尼龙,一般用在汽车行业和电子电气行业,它有尼龙的的特性,但是耐温又比尼龙高出很多,也就是说在温度很高的工作环境里面它会比普通尼龙表现的更优异,工作寿命更长。
目前市场上面的高温尼龙的基料基本上都是尼龙46,尼龙6T,9T等。
PP 是最常见的大宗料,比如你看到的塑料盆,收纳箱等,就是PP做的,PP的学名是聚丙乙烯,普通PP价格目前每吨一万多一点,特种改性PP价格稍贵。
两种材料是两个档次的,打个比喻来说,PPA是奔驰的话,PP就是奥拓。
希望能对你有所帮助。
苏威PPA料注塑温度

苏威PPA料注塑温度概述苏威PPA料是一种高性能工程塑料,具有优异的耐热性、耐化学性和机械性能。
在注塑成型过程中,控制好注塑温度对于获得理想的成型品质至关重要。
本文将重点介绍苏威PPA料的注塑温度范围及其对成型品质的影响。
注塑温度的选择苏威PPA料的注塑温度范围一般为260℃-310℃。
具体的注塑温度需要根据材料的牌号、型号以及产品的要求进行选择。
一般情况下,较高的注塑温度可以提高材料的流动性,有利于填充模具的细小结构,但同时也会增加材料的熔融粘度,容易导致热分解和气泡等缺陷。
较低的注塑温度可以减小熔体的熔体温度,降低成型品的热塑性加工变形。
注塑温度的影响成型品表面质量注塑温度对成型品的表面质量有直接的影响。
如果注塑温度过高,容易导致成型品表面出现热缩痕、流痕等缺陷;如果注塑温度过低,则可能出现光泽不良、流动痕迹、气泡等问题。
因此,选择适当的注塑温度对于获得符合要求的表面质量至关重要。
成型品尺寸稳定性注塑温度对成型品尺寸稳定性也有较大的影响。
过高的注塑温度会导致成型品的线性收缩率增大,从而引起尺寸偏差;过低的注塑温度则会减小线性收缩率,导致成型品尺寸过大。
选择适当的注塑温度可以使成型品的尺寸稳定性达到最佳状态。
成型品机械性能注塑温度还会对成型品的机械性能产生影响。
一般情况下,较高的注塑温度有利于提高成型品的强度,但如果温度过高,可能导致成型品变形、脆化等问题;较低的注塑温度则会降低成型品的韧性和冲击性能。
因此,在选择注塑温度时,需要综合考虑成型品的应用要求以及材料的机械性能。
结论苏威PPA料的注塑温度是影响成型品质量的重要因素之一。
在实际注塑过程中,应根据材料的牌号、型号以及产品要求,选择适当的注塑温度范围,并控制好注塑温度的稳定性。
只有通过科学而准确地控制注塑温度,才能获得具有优异性能和质量的苏威PPA料注塑成型品。
ppa材料特性

ppa材料特性
PPA强度、韧度和硬度优越性能,以及其良好的耐热件,耐化学性及抗开裂能力
PPA由于高温和高湿环境下仍能保持强度和硬度,可在传统的尼龙和聚酯所无法随的就用中替换金属
PPA塑料还具有优越的表面光泽性。
可以对其进行着色而避免了表面喷涂,从而有助于降低表面划痕和刮痕的明显程度。
PPA塑料还具有良好的可加工性,并允许短的注塑循环时间
与PA46相比:
√PPA具有比PA46更高的热稳定性;
√PPA具有比PA46更好的CTI/耐电弧能和红外同流能力;
√PPA具有比PA46更好的耐化学性;。
聚丙烯酰胺技术指标解析

聚丙烯酰胺技术指标解析
一、聚丙烯酰胺技术指标简介
聚丙烯酰胺(PPA)是一种热塑性工程塑料,具有优异的电气性能、
抗热性能、耐化学性能、机械性能及高温性能耐热抗风化等优点。
由于其
特殊的性能,聚丙烯酰胺已被广泛用于航空航天、军工、电子通信、医疗、电力、汽车、仪器仪表等领域。
二、聚丙烯酰胺技术指标
1、熔流率。
熔流率又称熔体流动性,是测定聚丙烯酰胺材料是否达
到用途要求的重要指标。
熔流率的测定方法主要用熔体流体计(MFR),
通过控制试样在一定温度下的流动负荷,测定熔体的流动速率。
一般情况
下熔流率单位为g/10min,根据熔体流动性的不同,可以将聚丙烯酰胺材
料分为低熔流型、中熔流型和高熔流型。
2、熔融指数。
熔融指数(MI)是指聚丙烯酰胺在特定温度下熔融高
度的比例。
该指数是测定聚丙烯酰胺热稳定性能的重要指标,也是决定聚
丙烯酰胺用途正确性的关键性指标。
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PPA-聚邻苯二甲酰胺英文名-PolyphthalamidePPA在高温高湿状态下,抗拉强度比尼龙6高20%,
比尼龙66更高.弯曲模量比尼龙高20%,硬度更大,能抗长时间的拉伸蠕变.
耐汽油、耐油脂和冷却剂的能力也比PA强.这种耐高温尼龙材料,可以耐200℃的持续高温,
并能保持良好的尺寸稳定性.
聚邻苯二甲酰胺(简称PPA)树脂是以对苯二甲酸或邻苯二甲酸为原料的半芳香
族聚酰胺。
既有半结晶态的,也有非结晶态的,其玻璃化温度在255°F左右.
非结晶态的PPA主要用于要求阻隔性能的场合,半结晶态的PPA树脂主要用于注塑加工,也用于其它熔融加工工艺.
PPA半结晶态熔点约590°F,以不透明矩形切片形式供应
1.PPA树脂比脂肪类聚酰胺如尼龙6、尼龙66等更结实坚硬;对水分的敏感度更低;热性能更好;而且蠕变、疲劳和耐化学品性能也好得多.如:含45%玻璃短纤维的PPA树脂,抗张强度约276MPa,弯曲模量超过13786MPa,热变形温度(HDT)549°F.即使矿物填料级的PPA,抗张强度也能达到117MPa.PPA树脂的延展性不如尼龙6、尼龙66,然而,已经开发出未增强的冲击改性级PPA树脂,其缺口悬臂梁式冲击强度高达20英尺·磅/英寸.所有的聚酚胺都吸收一定的水分,引起增塑作用和尺寸改变.例如尼龙6、尼龙6,在23°F下,相对湿度为100%时,能吸收8.9%的水分,这使其玻璃化温度由6.5°C降到一20℃,尺寸增加2.3%.在相同条件下,PPA树脂能吸收约6%的水分,但其玻璃化温度Tg不会低于40℃,伴随的尺寸增长不超过1.0%.正如前面所提过的,用玻璃增强的PPA树脂有很高的HDT值,能耐受很高温度的短期作用,例如:在一个供炉中或者在蒸汽相和在红外逆流团结过程中,PPA树脂的热氧化稳定性使它能耐长期高温作用,玻璃增
强级PPA,在20000小时内,其连续使用温度可达330°F.在正常环境下,PPA树脂通常对脂肪烃、芳香烃、氯代烃、酯、酮、醇和大多数水溶液表现出优秀的抗溶性.这类树脂不能经受极强的酸和强氧化剂的作用.可溶于酚和甲酚.2.PPA并非天生阻燃,根据UL94标准,阻燃级牌号的树脂的定级为VO,直至0.031英寸厚度.尽管其它熔融工艺也能使用,绝大多数PPA树脂是用传统注塑法加工的.把 PPA 原料预干燥到低于 0.1%的湿度水平,然后装入热密封的金属村里袋子或盒子内,这些容器能保证PPA原料在加工前不用再干燥.加工工艺可接受的湿度水平是0.15%或更低.加工湿的树脂能使分子量降低,造成相应的机械性能上的损失.使用干燥剂贮斗式干燥器,在175°F条件下很容易把树脂干燥到露点湿度达一25°F甚至更低.干燥时间视吸收的水量而定,一般在4—16个小时范围内.3.PPA 注塑时熔融温度在615—650°F范围内,物料在机筒内的停留时间不超过10分钟,这样注塑出来的产品机械性能最佳,要求模具温度至少275°F,以便得到完全结晶和尺寸稳定性最佳的产品.具有部分厚壁的部件,由于冷却速度慢,可以在较低的模温下注塑.模温对于成品部件的表面外感最佳化是至关重要的.用于真空镀金属成电镀金属的矿物填料级PPA树脂的模具表面温度要求350°F.4.由于PPA 树脂的杰出的物理、热和电性能,尤其是适中的成本,使它有广阔的应用范围.这些性能和优良的耐化学性一起,使PPA成为汽车工业许多用途的候选者.趋向更好的空气动力学车身设计连同更高性能的马达,将提高发动机箱的温度,使传统的热塑塑料显得不尽适用.这些新的要求使PPA成为:汽车前灯反光器、轴承座、
皮带轮、传感器壳体、燃料管线元件和电气元件的制作候选材料之一.5.电气元件的发展方向是小型化和高温团结,如红外固结和汽相团结,这需要PPA的优越性能.阻燃级PPA具有优良的电性能、很高的HDT值、高的高温弯曲模量、能以最小的溢料加工成长的薄壁部件,因此适合于制作开关设备.连接件、电刷座和马达托架.6.矿物填料级PPA用于反光表面和镀金属方面的用途,包括汽车前灯、装饰用管件和硬件.未经增强的冲击改性级PPA有极好的均衡机械性、高温性能.超常的韧性且这些性能受湿度的影响极小,其用途包括油田部件、军用品、体育用品、风扇叶轮和齿轮及个人安全用品.。