CN109593307A - Ptfe复合活塞环及其制备方法 - Google Patents

Ptfe复合活塞环及其制备方法 Download PDF

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CN109593307A
CN109593307A CN201811555561.2A CN201811555561A CN109593307A CN 109593307 A CN109593307 A CN 109593307A CN 201811555561 A CN201811555561 A CN 201811555561A CN 109593307 A CN109593307 A CN 109593307A
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piston ring
ptfe
ptfe composite
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composite
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杨文光
靳予
孙克原
王孝刚
夏炎
陈朝曦
林丰
焦小东
陈佩民
徐小曼
刘雪梅
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Nanjing Runte New Material Co Ltd
Nanjing Kent Composites Ltd By Share Ltd
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18Homopolymers or copolymers or tetrafluoroethene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/08Heat treatment
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/12Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08J2327/18Homopolymers or copolymers of tetrafluoroethylene
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2479/00Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
    • C08J2479/04Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08J2479/08Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/08Stabilised against heat, light or radiation or oxydation

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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

本发明公开了一种PTFE复合活塞环,其特征在于:该活塞环由PTFE复合材料构成,PTFE复合材料按质量百分比由以下组分构成:PTFE:76‑85%,PI:15‑24%。并公开了其制备方法。聚酰亚胺PI是一类具有十分稳定的芳杂环结构单元的耐热性高分子材料,具有突出的热稳定性,玻璃化温度Tg在260℃以上,可承受250~400℃的高温,优良的机械性能、抗辐射性能以及耐溶剂性能,并且在高温,高低压和高速等极端环境中具有很好的摩擦磨损性能。PI加入PTFE后可以增加复合材料的硬度,冲击强度以及弯曲强度,综合机械性能得到提升,一定量的PI对PTFE基体树脂可以辅助增韧,有利于提高PTFE的抗裂纹扩展和强韧性能。

Description

PTFE复合活塞环及其制备方法
技术领域
本发明涉及PTFE复合活塞环及其制备方法,属于高分子材料技术领域。
背景技术
聚四氟乙烯( PTFE)是一种综合性能优秀的聚合物材料,有极好的耐高低温性和耐化学腐蚀性,且介电性能优良,摩擦系数极小热稳定性好,可在-260℃~260℃长期使用,但是纯PTFE具有冷流性,尺寸稳定性差,介电强度低,磨损大等缺点。
活塞环是嵌入活塞沟槽内部的环状部件,在空气压缩机中起封气保压的作用,活塞环长期处于高温、高压、高载荷的环境,且需要长期与活塞沟槽摩擦,其机械性能非常重要。
发明内容
本发明的目的是提供一种PTFE复合活塞环,具有良好的机械性能。
为达到上述目的,本发明采用的技术方案为:一种PTFE复合活塞环,该活塞环由PTFE复合材料构成,PTFE复合材料按质量百分比由以下组分构成:
PTFE:76-85%
PI:15-24%。
优选的,所述PTFE为粒径25μm~40μm的悬浮细粉,表观密度为400~500g/L。
优选的,所述PI细粉的粒径为65~80μm,表观密度为800~1000g/L。
本发明还公开了上述的活塞环的制备方法,其步骤为:
(1)采用干法混合,将PTFE粉料和PI粉料按比例加入高速混料机中,高速搅拌均匀后取出,放置2~6h;
(2)使用压机进行冷压成型,压力10~30MPa,保压,脱模得到预成型样品;
(3)将预成型样品放入烧结炉中,在380±5℃下进行烧结3~6h;
(4)将烧结后的毛坯自然冷却至60~120℃,然后置于金属管内,加热至180~260℃,升温速率8~30℃/h;恒温保温;然后降至150℃~室温后取出,降温速率5~12℃/h;
(5)将退火后的毛坯进行机加工得到成型活塞环制品。
优选的,所述金属管直径略大于活塞环直径,使得活塞环可以较容易的放入或取出,且活塞环四周与金属管接触,长度大于等于活塞环长度。金属管可以选用无缝钢管,也可以采用其他无缝金属管,例如铜管或铝管。
优选的,步骤(2)中保压时间为1~5min。
优选的,步骤(4)中保温时间按活塞环壁厚每毫米0.5~2h计算,壁厚=(活塞环外径-内径)/2。
本发明中,聚酰亚胺PI是一类具有十分稳定的芳杂环结构单元的耐热性高分子材料,具有突出的热稳定性,玻璃化温度Tg在260℃以上,可承受250~400℃的高温,优良的机械性能、抗辐射性能以及耐溶剂性能,并且在高温,高低压和高速等极端环境中具有很好的摩擦磨损性能,常作为高性能热塑性复合材料在航空航天等领域。PI加入PTFE后可以增加复合材料的硬度,冲击强度以及弯曲强度,综合机械性能得到提升,一定量的PI对PTFE基体树脂可以辅助增韧,有利于提高PTFE的抗裂纹扩展和强韧性能。将烧结后的活塞环做退火处理,可以有效提高活塞环的内应力,防止活塞环开裂。将活塞环置于金属管内退火,活塞环外侧与金属管接触,使得活塞环处于一个均匀的退火氛围中,退火效果更佳。金属管升温及降温速度快,易于控制,且只需要保证金属管的小范围内温度统一,可以有效节约能源。
具体实施方式
实施例1-3
本PTFE复合活塞环的制备方法为:
(1)采用干法混合,将PTFE粉料和PI粉料按比例加入高速混料机中,高速搅拌均匀后取出,放置2~6h;
(2)使用压机进行冷压成型,压力10~30MPa,保压1~5min,脱模得到预成型样品;
(3)将预成型样品放入烧结炉中,在380±5℃下进行烧结3~6h;
(4)将烧结后的毛坯自然冷却至60~120℃,然后置于金属管内,加热至180~260℃,升温速率8~30℃/h;恒温保温;然后降至150℃~室温后取出,降温速率5~12℃/h;
(5)将退火后的毛坯进行机加工得到成型活塞环制品。
其中PTFE为粒径25μm~40μm的悬浮细粉,表观密度为400~500g/L,所述PI细粉的粒径为65~80μm,表观密度为800~1000g/L。
对制得的活塞环进行性能测试,测试结果见表2。
表1 实施例1-3的组分表
表2 实施例1-3活塞环性能测试
表2中的活塞环均为在冷压压力20MPa,保压时间为1min,烧结4h,自然冷却至80℃,升温速率为10℃/h,升温至220℃,保温12h,降温速率为10℃/h,降至室温取出的条件下制得。

Claims (7)

1.一种PTFE复合活塞环,其特征在于:该活塞环由PTFE复合材料构成,PTFE复合材料按质量百分比由以下组分构成:
PTFE:76-85%
PI:15-24%。
2.根据权利要求1所述的PTFE复合活塞环,其特征在于:所述PTFE为粒径25μm~40μm的悬浮细粉,表观密度为400~500g/L。
3.根据权利要求2所述的PTFE复合活塞环,其特征在于:所述PI细粉的粒径为65~80μm,表观密度为800~1000g/L。
4.权利要求1-3中任一项所述的活塞环的制备方法,其步骤为:
(1)采用干法混合,将PTFE粉料和PI粉料按比例加入高速混料机中,高速搅拌均匀后取出,放置2~6h;
(2)使用压机进行冷压成型,压力10~30MPa,保压,脱模得到预成型样品;
(3)将预成型样品放入烧结炉中,在380±5℃下进行烧结3~6h;
(4)将烧结后的毛坯自然冷却至60~120℃,然后置于金属管内,加热至180~260℃,升温速率8~30℃/h;恒温保温;然后降至150℃~室温后取出,降温速率5~12℃/h;
(5)将退火后的毛坯进行机加工得到成型活塞环制品。
5.根据权利要求4所述的活塞环的制备方法,其特征在于:所述金属管直径略大于活塞环直径,长度大于等于活塞环长度。
6.根据权利要求5所述的活塞环的制备方法,其特征在于:步骤(2)中保压时间为1~5min。
7.根据权利要求6所述的活塞环的制备方法,其特征在于:步骤(4)中保温时间按活塞环壁厚每毫米0.5~2h计算。
CN201811555561.2A 2018-12-18 2018-12-18 Ptfe复合活塞环及其制备方法 Pending CN109593307A (zh)

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CN111171551A (zh) * 2020-01-20 2020-05-19 深圳市德诚旺科技有限公司 无油压缩机皮碗的pok复合材料及其制备方法
CN112608573A (zh) * 2020-11-27 2021-04-06 南京肯特复合材料股份有限公司 一种防偏移耐磨密封圈材料及其制备方法
CN113524731A (zh) * 2021-07-08 2021-10-22 江苏合球机械科技有限公司 一种螺杆泵转子衬套的高温退火热处理工艺

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CN113524731A (zh) * 2021-07-08 2021-10-22 江苏合球机械科技有限公司 一种螺杆泵转子衬套的高温退火热处理工艺

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Application publication date: 20190409