Study on Friction and Wear Properties of Semi⁃aromatic Polyamide PA6T and Its PTFE Composites

doi:10.19491/j.issn.1001-9278.2021.07.001

Abstract

Abstract:

The friction and wear properties of three types of polyhexamethylene terephthalamide （PA6T） with different copolymerization structures， including polyhexamethylene terephthalamide-co-caprolactam （1132）， polyhexameth-ylene terephthalamide-co-hexamethylene adipamide （M21） and polyhexamethylene terephthalamide-co-hexameth-ylene adi-pamide （1252） were investigated under the dry sliding condition， and their worn surfaces were observed with scanning electron microscopy. The results indicated that the 1252 had the best friction and wear performance， but those of the 1132 was the worst. The addition of PTFE improved the friction and wear properties of these three resins. Among them， the friction and wear properties of 1252 were improved most effectively. When the 30 phr of PTFE was incorporated， the friction coefficient and wear rate of the 1252 decreased down to 0.16 and 1.00×10^-6， respectively. As for the wear mechanism， the wear mode of the 1132 mainly belongs to adhesive wear and fatigue wear， whereas the main wear mode of the M21 and 1252 was attributed to abrasive wear. The main wear mode of the PA6T composites was transformed into adhesive wear with an increase in PTFE content.

Key words: polyhexamethylene terephthalamide, copolymerization structure, polytetrafluoroethylene, friction and wear property, wear mechanism

CLC Number:

TQ323.6

CHEN Quangui, ZHANG Meilin, WANG Xiaojun, YANG Jie. Study on Friction and Wear Properties of Semi⁃aromatic Polyamide PA6T and Its PTFE Composites[J]. China Plastics, 2021, 35(7): 1-11.

Figures/Tables 12

PA6T

种类

结构式

对苯二甲酰己二胺链段（6T）比例（摩尔比）/%

特性黏度/

dL·g^-1

Tab.1. Properties of PA6T with different molecular structure

PA6T种类	一段	二段	三段	四段	五段	六段	七段	八段	九段	十段	机头
1132	220	260	280	290	300	305	310	310	310	310	305
M21	220	260	280	290	300	305	310	310	310	310	305
1252	220	260	280	290	310	320	330	330	330	330	320

Tab.2. Temperature at different zone of the twin screw extruder

PA6T

种类

一段

温度/^oC

二段

温度/^oC

三段

温度/^oC

注射

压力/%

注射速度/%

保压

时间/s

Tab.3. Parameters of the injection molding machine

Fig.1. Online friction coefficient of PA6T with different molecular structure

Fig.2. Average friction coefficient and volumetric wear rate of PA6T with different molecular structure

PA6T 种类	PTEF含量/份
PA6T 种类	5	10	15	20	30
1132
M21
1252

Tab.4. SEM images of fracture surfaces of PA6T/PTFE composites

Fig.3. Online friction coefficient of PA6T/PTFE composites

Fig.4. Average friction coefficient and volumetric wear rate of PA6T/PTFE composites

Fig.5. SEM images of worn surfaces of 1132/PTFE composites

Fig.6. SEM images of worn surfaces of M21/PTFE composites

Fig.7. SEM images of worn surfaces of 1252/PTFE composites

PTEF含量/ 份	PA6T种类
PTEF含量/ 份	1132	M21	1252
0
5
10
15
20
30

Tab.5. Transfer film of the counterpart surface of PA6T/PTFE composites

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