CN110483872B - 一种有机硅酮母粒和自清洁pert地暖管材及其制备方法 - Google Patents
一种有机硅酮母粒和自清洁pert地暖管材及其制备方法 Download PDFInfo
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- CN110483872B CN110483872B CN201910757300.7A CN201910757300A CN110483872B CN 110483872 B CN110483872 B CN 110483872B CN 201910757300 A CN201910757300 A CN 201910757300A CN 110483872 B CN110483872 B CN 110483872B
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- organic silicone
- master batch
- floor heating
- heating pipe
- self
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Abstract
本发明涉及地暖管材技术领域,具体涉及一种有机硅酮母粒和自清洁PERT地暖管材及其制备方法。本发明提供的有机硅酮母粒,由包括以下重量份数的原料制备得到:有机硅酮粉40~60份;含氟聚合物2~10份;基体树脂80~120份。在本发明中,有机硅酮粉是有效成分,分散在基体树脂中,在含氟聚合物的配合作用下,可以显著提高有机硅酮母粒的润滑性,基体树脂作为载体与耐热聚乙烯有良好的相容性,采用本发明提供的有机硅酮母粒制备地暖管,能够显著提高管材内壁的光洁性,管道内水中的污垢和细菌难以附着在管道内壁,随着水体流动,起到自清洁作用,提高地暖管材的防垢性能。
Description
技术领域
本发明涉及地暖管材技术领域,具体涉及一种有机硅酮母粒和自清洁PERT地暖管材及其制备方法。
背景技术
随着人们对采暖系统的要求不断提高,各种功能型地暖管便应用而生。在地面辐射采暖系统中,主要用到的管材材质有PEX、PERT、PB等。在采暖系统中,水中的氧气会进入管道中滋生细菌,最后在管壁形成微生物粘泥,大大降低管道的导热效率;同时,由于管道在加工过程中内壁通常有褶皱,会降低管道内热水流动速率,也会使水中的一些微生物附着,最终形成微生物粘泥,影响采暖效果。
PEX和PB地暖管存在柔韧性较差、加工复杂的缺陷;PERT地暖管,即耐热聚乙烯管,具有质轻,使用寿命长,良好的柔韧性、易弯曲等优点,但PERT地暖管的防垢性能仍有待改善。
发明内容
本发明的目的在于提供一种有机硅酮母粒和自清洁PERT地暖管材及其制备方法,本发明提供的有机硅酮母粒可以显著提高管材内表面的光洁性,提高地暖管材的防垢性能。
为了实现上述发明目的,本发明提供以下技术方案:
本发明提供了一种有机硅酮母粒,由包括以下重量份数的原料制备得到:
有机硅酮粉40~60份;
含氟聚合物2~10份;
基体树脂80~120份。
优选地,所述有机硅酮粉的制备方法,包括以下步骤:
(1)提供含表面活性剂的分散液;
(2)将步骤(1)所述分散液与硅油、催化剂混合,发生交联反应,得到有机硅酮乳液;
(3)将所述有机硅酮乳液依次经过滤、洗涤、干燥和过筛,得到有机硅酮粉。
优选地,所述有机硅酮粉的粒径为2~10μm。
优选地,所述含氟聚合物包括乙烯-四氟乙烯共聚物、聚四氟乙烯、氟化乙丙共聚物、全氟烷氧基树脂、聚氯三氟乙烯、乙烯一氯三氟乙烯共聚合物、聚偏氟乙烯和聚氟乙烯中的一种或几种。
优选地,所述基体树脂包括乙烯醋酸乙烯酯或聚乙烯。
本发明还提供了一种自清洁PERT地暖管材,包括外壁和内壁,所述外壁由第一耐热聚乙烯制备得到;
所述内壁由包括以下重量份数的原料制备得到:第二耐热聚乙烯100份,上述技术方案所述的有机硅酮母粒1~3份,白色母1~3份,加工助剂1~6份。
优选地,所述外壁与内壁的壁厚比为(2~9):1。
本发明提供了上述技术方案所述自清洁PERT地暖管材的制备方法,包括以下步骤:
(1)将第二耐热聚乙烯、有机硅酮母粒、白色母和加工助剂共混,得到内壁混合物;
(2)将步骤(1)所述内壁混合物和第一耐热聚乙烯置于挤出机中,挤出成型,得到自清洁PERT地暖管材。
优选地,步骤(1)所述共混的具体方法为:先将第二耐热聚乙烯、白色母和加工助剂置于混合机中,在50~200rpm转速下运行5~15s;然后加入有机硅酮母粒,在50~200rpm转速下运行15~25s,再在600~1000rpm转速下运行30~50s。
优选地,步骤(2)所述挤出机的机筒温度为180~220℃。
本发明提供了一种有机硅酮母粒,由包括以下重量份数的原料制备得到:有机硅酮粉40~60份;含氟聚合物2~10份;基体树脂80~120份。在本发明中,有机硅酮粉是有效成分,分散在基体树脂中,在含氟聚合物的配合作用下,可以显著提高有机硅酮母粒的润滑性,基体树脂作为载体与耐热聚乙烯有良好的相容性,采用本发明提供的有机硅酮母粒制备PERT地暖管材,能够显著提高管材内壁的光洁性,管道内水中的污垢和细菌难以附着在管道内壁,随着水体流动,起到自清洁作用,提高PERT地暖管材的防垢性能。
本发明还提供了一种自清洁PERT地暖管材,包括外壁和内壁,所述外壁由第一耐热聚乙烯制备得到;所述内壁由包括以下重量份数的原料制备得到:第二耐热聚乙烯100份,上述技术方案所述的有机硅酮母粒1~3份,白色母1~3份,加工助剂1~6份。本发明将耐热聚乙烯与有机硅酮母粒配合使用,有利于提高PERT地暖管材的耐温性,耐磨损性能、抗冲击性能和耐腐蚀性,同时能够降低PERT地暖管材的滑动摩擦因数,提高管道内热水流动速率,使PERT地暖管材具有自清洁功能,延长地暖管材的使用寿命。
本发明还提供了自清洁PERT地暖管材的制备方法,制备工艺简单,操作方便,生产成本低,适宜工业化大规模应用。
附图说明
图1为本发明提供的自清洁PERT地暖管材的实物图;
图2为PERT地暖管材的切面图。
具体实施方式
本发明提供了一种有机硅酮母粒,由包括以下重量份数的原料制备得到:
有机硅酮粉40~60份;
含氟聚合物2~10份;
基体树脂80~120份。
在本发明中,若无特殊说明,所采用的制备原料均为本领域技术人员所熟知的市售商品。
在本发明中,以重量份数计,所述有机硅酮母粒的制备原料包括有机硅酮粉40~60份,优选为50份。在本发明中,所述有机硅酮粉的粒径优选为2~10μm,更优选为6μm。在本发明中,所述有机硅酮粉的制备方法,优选包括以下步骤:
(1)提供含表面活性剂的分散液;
(2)将步骤(1)所述分散液与硅油、催化剂混合,发生交联反应,得到有机硅酮乳液;
(3)将所述有机硅酮乳液依次经过滤、洗涤、干燥和过筛,得到有机硅酮粉。
本发明优选提供含表面活性剂的分散液。在本发明中,所述含表面活性剂的分散液的具体制备方法优选为:将表面活性剂与水混合,调节pH值为6~8,得到所述含表面活性剂的分散液。在本发明中,所述表面活性剂优选包括烷基苯磺酸钠、壬基酚聚氧乙烯醚和十二烷基硫酸钠中的一种或几种;所述水优选为去离子水。在本发明中,所述表面活性剂与水的质量比优选为(15~65):(500~1000),更优选为52:880。在本发明的具体实施例中,当表面活性剂为烷基苯磺酸钠和十二烷基硫酸钠的混合物时,所述烷基苯磺酸钠、十二烷基硫酸钠表面活性剂与水的质量比优选为(10~50):(5~15):(500~1000)。
在本发明中,优选将表面活性剂加入水中混合,所述混合优选在室温条件下进行,所述室温具体指23±2℃。在本发明中,所述混合优选在搅拌条件下进行,所述搅拌的速度优选为300~500rpm,更优选为450rpm。所述搅拌的时间优选为8~15min,更优选为10min。在本发明中,优选采用盐酸调节体系的pH值,所述盐酸的质量浓度优选为20~36%。
得到含表面活性剂的分散液后,本发明优选将所述分散液与硅油、催化剂混合,发生交联反应,得到有机硅酮乳液。在本发明中,所述硅油优选包括甲基硅油、氨基硅油、环氧改性硅油、羧基改性硅油、醇基改性硅油、酚基改性硅油、巯基改性硅油、丙烯酰氧基改性硅油、甲基丙烯酰氧基改性硅油、甲基长链烷基硅油、甲基三氟丙基硅油和聚醚改性硅油的一种或者几种;所述催化剂优选包括四甲基氢氧化铵、氢氧化钾、浓硫酸和辛酸亚锡中的一种或几种。在本发明中,硅油、催化剂和含表面活性剂的分散液的质量比优选为(300~700):(1~2):(515~1065),更优选为530:1.8:932。在本发明的具体实施例中,当硅油为氨基硅油和甲基硅油时,催化剂为四甲基氢氧化铵时,所述氨基硅油、甲基硅油、四甲基氢氧化铵和含表面活性剂的分散液的质量比优选为:(200~400):(100~300):(1~2):(515~1065)。
在本发明中,优选将硅油和催化剂加入分散液中混合,所述混合的温度优选为50℃;所述混合优选在搅拌条件下进行,具体优选为:先以1200~1500rpm的转速搅拌20~30min,然后再以200~500rpm的转速搅拌8~10h。
本发明在将所述分散液与硅油、催化剂混合后,优选将所得体系静置,在所述静置过程中发生交联反应。在本发明中,所述交联反应的温度优选为室温,所述交联反应的时间优选为48h以上。本发明在所述静置过程中,硅油在含表面活性剂的分散液中交联固化,得到熟化分散均匀的有机硅酮乳液。
得到有机硅酮乳液后,本发明优选将所述有机硅酮乳液依次经过滤、洗涤、干燥和过筛,得到有机硅酮粉。本发明对所述过滤没有特殊的限定,采用本领域常规的过滤方式即可,本发明通过过滤,得到固体物质为有机硅酮粒子。在本发明中,所述洗涤用洗涤剂优选为去离子水,本发明通过洗涤去除有机硅酮粒子表面的表面活性剂和催化剂,得到白色粉状物,经干燥和过筛后,得到有机硅酮粉。在本发明中,所述干燥的温度优选为60~80℃,时间优选为2h。
在本发明中,以所述有机硅酮粉的重量份数为基准,所述有机硅酮母粒的制备原料包括含氟聚合物2~10份,优选为5份,所述含氟聚合物优选包括乙烯-四氟乙烯共聚物、聚四氟乙烯、氟化乙丙共聚物、全氟烷氧基树脂、聚氯三氟乙烯、乙烯一氯三氟乙烯共聚合物、聚偏氟乙烯和聚氟乙烯中的一种或几种,更优选为聚四氟乙烯。
在本发明中,以所述有机硅酮粉的重量份数为基准,所述有机硅酮母粒的制备原料包括基体树脂80~120份,优选为100份,所述基体树脂优选包括乙烯醋酸乙烯酯或聚乙烯。
在本发明中,所述有机硅酮母粒的制备方法优选包括:将有机硅酮粉、含氟聚合物和基体树脂混合,造粒后,得到有机硅酮母粒。在本发明中,所述混合优选在高混机中进行,所述混合时的搅拌速度优选为50~200rpm,更优选为170rpm。
本发明优选采用双螺杆挤出机造粒,所述双螺杆挤出机的长径比L/D优选为30~36;所述造粒的温度优选为150~170℃。本发明优选在造粒结束后,进行热切,得到所述有机硅酮母粒。在本发明中,所述有机硅酮母粒优选为白色颗粒,灰分优选为61.7%,密度优选为1.19g/cm3,熔融指数(220℃,5kg)优选为1.317。
本发明还提供了一种自清洁PERT地暖管材,包括外壁和内壁,所述外壁由第一耐热聚乙烯制备得到;
所述内壁由包括以下重量份数的原料制备得到:第二耐热聚乙烯100份,上述技术方案所述的有机硅酮母粒1~3份,白色母1~3份,加工助剂1~6份。
在本发明中,所述外壁与内壁的壁厚比优选为(2~9):1,更优选为(2.2~8.2):1。
本发明提供的自清洁PERT地暖管材的外壁由第一耐热聚乙烯制备得到。在本发明中,所述第一耐热聚乙烯优选为LG 980、LG SP988、道达尔XRT70、齐鲁石化QHM32F或大林XP9000。
本发明提供的自清洁PERT地暖管材的内壁由包括以下重量份数的原料制备得到:第二耐热聚乙烯100份,上述技术方案所述的有机硅酮母粒1~3份,白色母1~3份,加工助剂1~6份。
在本发明中,按重量份数计,所述内壁的制备原料包括第二耐热聚乙烯100份。在本发明中,所述第二耐热聚乙烯优选为LG 980、LG SP988、道达尔XRT70、齐鲁石化QHM32F或大林XP9000。
在本发明中,以所述第二耐热聚乙烯的重量份数为基准,所述内壁的制备原料包括上述技术方案所述的有机硅酮母粒1~3份,优选为2.5份。本发明通过添加有机硅酮母粒能够降低PERT地暖管材的滑动摩擦因数,提高热水流动性,增加PERT地暖管材内壁的防垢性能。
在本发明中,以所述第二耐热聚乙烯的重量份数为基准,所述内壁的制备原料包括白色母1~3份,优选为2份。在本发明中,所述白色母的来源优选为北化高科。在本发明中,白色母有着良好的分散性,能够使PERT管材在生产过程中获得稳定的工艺,而且具有良好的遮盖、耐热及耐光稳定性。
在本发明中,以所述第二耐热聚乙烯的重量份数为基准,所述内壁的制备原料包括加工助剂1~6份,优选为4份。在本发明中,所述加工助剂包括抗氧剂和相容剂;所述抗氧剂优选包括抗氧剂1010、抗氧剂1076、抗氧剂CA、抗氧剂164、抗氧剂TPP和抗氧剂TNP中的一种或几种,所述抗氧剂的质量优选占总加工助剂质量的8~33%;所述相容剂优选包括马来酸改性聚乙烯、硅烷偶联剂KH550、硅烷偶联剂KH560、硅烷偶联剂KH570、硅烷偶联剂KH792和钛酸酯偶联剂中的一种或几种,所述相容剂的质量优选占总加工助剂质量的8~66%。在本发明中,相容剂和抗氧剂能够提高PERT分子间的滑动性,改善产品的加工流动性和耐热氧化性。
本发明提供了上述技术方案所述自清洁PERT地暖管材的制备方法,包括以下步骤:
(1)将第二耐热聚乙烯、有机硅酮母粒、白色母和加工助剂共混,得到内壁混合物;
(2)将步骤(1)所述内壁混合物和第一耐热聚乙烯置于挤出机中,挤出成型,得到自清洁PERT地暖管材。
本发明将第二耐热聚乙烯、有机硅酮母粒、白色母和加工助剂共混,得到内壁混合物。在本发明中,所述第二耐热聚乙烯和有机硅酮母粒优选先独立地进行真空干燥,再与其他原料混合。在本发明中,所述真空干燥的温度优选为80℃,真空度优选为200Pa,真空干燥的时间优选为1~2h。
在本发明中,所述共混的具体方法优选为:先将第二耐热聚乙烯置于混合机中,在50~200rpm转速下运行5~15s;然后加入有机硅酮母粒,先在50~200rpm转速下运行15~25s,再在600~1000rpm转速下运行30~50s。本发明采用上述混合方式有利于各原料充分混合均匀。
得到内壁混合物后,本发明将所述内壁混合物和第一耐热聚乙烯置于挤出机中,挤出成型,得到自清洁PERT地暖管材。在本发明中,所述挤出机的机筒温度优选为180~220℃,模具温度优选为160~185℃。
本发明在所述挤出成型结束后,优选依次经牵引、切割,得到自清洁PERT地暖管材。本发明对所述自清洁PERT地暖管材的具体长度、直径和总壁厚没有特殊的限定,可以根据需求进行定制。在本发明的具体实施例中,所述自清洁PERT地暖管材的壁厚和直径见表1:
表1自清洁PERT地暖管材的壁厚和直径
下面将结合本发明中的实施例,对本发明中的技术方案进行清楚、完整地描述。显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
实施例1
A、制备有机硅酮母粒
(1)室温状态下,在900g水中,加入40g烷基苯磺酸钠,10g十二烷基硫酸钠,用质量浓度为25%的盐酸调节pH值为6,电磁搅拌10min,制得含表面活性剂的分散液;
(2)将1.5g四甲基氢氧化铵,320g氨基硅油,208g甲基硅油一起加入步骤(1)所得含表面活性剂的分散液中,在50℃恒温状态下,用高搅机,在1350rpm的速度下搅拌28min,再转为慢速,在230rpm的速度下搅拌9h后,在室温下静止存放50h,使得硅油在含表面活性剂的分散液中交联固化,得到熟化分散均匀的有机硅酮乳液;
(3)将上述交联反应后的有机硅酮乳液过滤,用去离子水进行充分的洗涤,去除残余的表面活性剂和催化剂,得到白色的粉状物,在70℃条件下干燥2h,过筛后得到有机硅酮粉,所得有机硅酮粉的粒径为3μm;
将50kg有机硅酮粉、5kg聚四氟乙烯粉(粒径为6μm)和100kg聚乙烯粉(粒径为13μm)在高混机中,在170rpm的搅拌速度下,搅拌1.5h,进行充分混合;
用长径比L/D为32的双螺杆挤出机,对上述混合物在165℃条件下进行造粒,采用热切工艺,得到有机硅酮母粒。
B、制备自清洁PERT地暖管材
(1)耐热聚乙烯和有机硅酮母粒共混
将100kg耐热聚乙烯(PERT(32F))和2.5kg有机硅酮母粒在真空条件下,分别单独干燥处理1h;然后,将100kg耐热聚乙烯、2kg北化高科白色母、1.5kg抗氧剂1076和2kg马来酸改性聚乙烯加入混合机,在180rpm的速度下搅拌15s,将其打散;再将有机硅酮母粒加入混合机,先在180rpm的搅拌速度下搅拌15s,再在850rpm的搅拌速度下搅拌45s,使各物料充分混合均匀;
(2)挤出成型
将混合均匀的耐热聚乙烯、有机硅酮母粒、北化高科白色母、抗氧剂1076和马来酸改性聚乙烯的共混料,与外壁用耐热聚乙烯(100%纯PERT(32F)树脂原料),按顺序投入到挤出机中挤出成型,确定管径的尺寸,进行牵引、切割,最终得到具有自清结功能的PERT地暖管材;其中,挤出机的机筒温度设定为200℃,模具温度为185℃。
制备得到的自清洁PERT地暖管材,壁厚为2.02-2.10mm(具体为2.1mm),外径为20.15±0.25mm,内壁动摩擦因数为0.169,实物图如图1所示。由图1可以看出,本发明提供的自清洁PERT地暖管材包括外壁和内壁两层结构。
对比例1
(1)将100kg耐热聚乙烯和2kgPPA在真空条件下,进行分别单独干燥处理1h;然后将其加入混合机,高速850rpm搅拌50s,均匀混合后得到预混料;
(2)将混合均匀的耐热聚乙烯和PPA共混料,经挤出机中挤出成型,确定管径的尺寸,进行牵引、切割,最终得到PERT地暖管材,设备的料筒温度190℃,模具温度180℃。
制备得到的PERT地暖管材,壁厚为2.05mm,外径为20.15±0.25mm,内壁动摩擦因数为0.314。
测试例1
测试实施例1所得自清洁PERT地暖管材和对比例1所得PERT地暖管材在水泵房回水中的防垢效果,具体测试方法为:公司循环冷却回水,水的总量400吨,流速3m/s,回水温度35℃;将待测样品放置在水泵房流动回水中浸泡2个月后,切开对比防垢效果,测试结果如图2所示。图2中的a为对比例1所得PERT地暖管材的防垢效果,图2中的b为实施例1所得自清洁PERT地暖管材的防垢效果,由图2可以看出,本发明提供的自清洁PERT地暖管材内壁上水垢的附着量明显减少。本发明提供的自清洁PERT地暖管材,由于在内壁料中添加了有机硅酮母粒,替换了原PPA(C616)添加物,显著地降低了PERT地暖管材滑动摩擦因数,内壁动摩擦因素从原来的0.314,降低至0.169,提高了PERT地暖管材的防垢性能。
测试例2
参照GB/T28799.2-2012测试实施例1所得自清洁PERT地暖管材和对比例1所得PERT地暖管材的耐温性、防垢性能、强度和抗冲击性能,所得结果见表2:
表2性能测试结果
由表2可以看出,加有机硅酮母粒后的自清洁PERT地暖管材,常温和高耐压性能均优于对比例1;实施例1的内壁动摩擦系数仅为对比例1的一半,动摩擦因数大大降低,光洁度提高;污水浸泡实验表明,实施例1的内壁污垢极少、甚至无污垢;实施例1的自清洁PERT地暖管材弯曲模量为670MPa,大于对比例1的600MPa,强度高于对比例1。
本发明提供的自清洁PERT地暖管材低温、高温打压性能均较好,本发明采用主要成分为硅氧烷的有机硅酮母粒替代主要成分为含氟的有机聚合物的PPA,尽管有机硅酮母粒与PPA成分不同,而且在灰分、密度、熔指方面存在着较大差异,但通过实验的加工过程中,发现原样和试样参数基本相同,没有差异性,成型工艺相同,不存在差异。经过成本核算发现加入有机硅酮母粒的内壁配方比PPA配方每吨只高出27.72元。
本发明提供的自清洁PERT地暖管材具有耐温,耐磨损,滑动摩擦因数低,热水流动性优良,可承受高载荷,高强度,抗冲击性能显著,耐腐蚀,使用寿命长,内壁防垢性能佳等优点,且制备工艺简单、操作方便,生产成本低,适宜工业化推广应用。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (1)
1.一种自清洁PERT地暖管材的制备方法,其特征在于,包括以下步骤:
A、制备有机硅酮母粒
(1)室温状态下,在900g水中,加入40g烷基苯磺酸钠,10g十二烷基硫酸钠,用质量浓度为25%的盐酸调节pH值为6,电磁搅拌10min,制得含表面活性剂的分散液;
(2)将1 .5g四甲基氢氧化铵,320g氨基硅油,208g甲基硅油一起加入步骤(1)所得含表面活性剂的分散液中,在50℃恒温状态下,用高搅机,在1350rpm的速度下搅拌28min,再转为慢速,在230rpm的速度下搅拌9h后,在室温下静止存放50h,使得硅油在含表面活性剂的分散液中交联固化,得到熟化分散均匀的有机硅酮乳液;
(3)将上述交联反应后的有机硅酮乳液过滤,用去离子水进行充分的洗涤,去除残余的表面活性剂和催化剂,得到白色的粉状物,在70℃条件下干燥2h,过筛后得到有机硅酮粉,所得有机硅酮粉的粒径为3μm;
将50kg有机硅酮粉、5kg聚四氟乙烯粉和100kg聚乙烯粉在高混机中,在170rpm的搅拌速度下,搅拌1.5h,进行充分混合;所述聚四氟乙烯粉的粒径为6μm,所述聚乙烯粉的粒径为13μm;
用长径比L/D为32的双螺杆挤出机,对上述混合物在165℃条件下进行造粒,采用热切工艺,得到有机硅酮母粒;
B、制备自清洁PERT地暖管材
(a)耐热聚乙烯和有机硅酮母粒共混
将100kg耐热聚乙烯和2.5kg有机硅酮母粒在真空条件下,分别单独干燥处理1h;然后,将100kg耐热聚乙烯、2kg北化高科白色母、1.5kg抗氧剂1076和2kg马来酸改性聚乙烯加入混合机,在180rpm的速度下搅拌15s,将其打散;再将有机硅酮母粒加入混合机,先在180rpm的搅拌速度下搅拌15s,再在850rpm的搅拌速度下搅拌45s,使各物料充分混合均匀;
(b)挤出成型
将混合均匀的耐热聚乙烯、有机硅酮母粒、北化高科白色母、抗氧剂1076和马来酸改性聚乙烯的共混料,与外壁用耐热聚乙烯,按顺序投入到挤出机中挤出成型,确定管径的尺寸,进行牵引、切割,最终得到具有自清结功能的PERT地暖管材;其中,挤出机的机筒温度设定为200℃,模具温度为185℃;
制备得到的自清洁PERT地暖管材,壁厚为2.1mm,外径为20.15±0.25mm,内壁动摩擦因数为0.169。
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