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生料帶聚四氟乙烯有哪些性能呢?

2022-01-17 16:48

生料帶聚四氟乙烯的一般性能

聚四氟乙烯的優點如下:

(1)寬闊的使用溫度范圍。它可以在一250它至260℃的范圍內長期連續地使用:當溫度超過260℃時,聚四氟乙烯就開始有微量的分解,但400℃時才開始顯著分解,415℃時急劇分解,而在450℃時升華;

(2)優異的化學穩定性。在這方面,它是已知的工程塑料中比較好的。它與濃酸、稀酸、王水、濃堿和強氧化劑。即便在高溫環境中也不發生作用,與大多數有機溶劑,如醇、醚、酮等都無作用:它也不在水或油中溶脹;

(3)高的電緣件,而且不受環境條件、工作溫度、根度和頻率的影響:

(4)突出的表面不粘性。幾乎所有的粘性物質都不易粘附在它的表面上;

(5)良好的潤滑性。它和石墨,二硫化鉬并稱三大固體潤滑劑,而且是三者中摩擦系數比較小的;

(6)摩擦系數很小,它是已知可實用的滑動而材料中摩擦系數值比較低的,達0.04(新出現的聚對羥基苯甲酸的噴涂膜,摩擦系數可低達0.0005,但還不能在滑動面上廣泛應用)。它的動摩擦系數與靜摩擦系數非常接近,而且動摩擦系數是隨滑動速度的增加而增加的,所以,在極低的速度下也不會出現爬行現象;

(7)非常好的耐大氣老化性能。長年在大氣中暴露,表面和各項性能都保持不變,是塑料中抗老化性能較好的;

(8)完全不燃燒性;

(9)易于轉移到金屬表面上:

(10)硬度低、質地較軟,具有吸收與包容異物的能力;

(11)易于機械加工。

General properties of raw tape ptfe

The advantages of PTFE are as follows:

(1) wide temperature range. It can be in a 250 it to 260℃ range of long-term continuous use: when the temperature exceeds 260℃, ptfe began to have a trace of decomposition, but 400℃ began to significantly decomposition, 415℃ sharp decomposition, and at 450℃ sublimation;

(2) Excellent chemical stability. In this respect, it is the best known engineering plastic. It is associated with concentrated acid, dilute acid, aqua regia, concentrated alkali and strong oxidant. It does not act even at high temperatures, and does not act with most organic solvents, such as alcohols, ethers, ketones, etc. It does not swell in water or oil;

(3) high electrical insulation parts, and not affected by environmental conditions, operating temperature, rootedness and frequency:

(4) Outstanding surface is not sticky. Almost all sticky substances do not adhere easily to its surface;

(5) good lubricity. It and graphite, molybdenum disulfide said three solid lubricants, and is the friction coefficient of the three is the least;

(6) The friction coefficient is very small, it is known to be practical sliding and the friction coefficient value of the lowest material, up to 0.04(newly emerged polyhydroxybenzoic acid spray film, friction coefficient can be as low as 0.0005, but can not be widely used on the sliding surface). The coefficient of dynamic friction is very close to the coefficient of static friction, and the coefficient of dynamic friction increases with the increase of sliding speed, so there will be no crawling phenomenon at very low speed.

(7) Very good atmospheric aging resistance. Exposure in the atmosphere for years, the surface and properties remain unchanged, is a good anti-aging performance in plastics;

(8) completely non-combustibility;

(9) Easy to transfer to the metal surface:

(10) low hardness, soft texture, with the ability to absorb and contain foreign bodies;

(11) Easy to be machined.

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