What are the advantages of PTFE tube?

2021-12-21   Pageview:140

1. Excellent resistance to high and low temperatures – – PTFE tubes do not change much to the temperature, the temperature range is wide, the melting point is 327 ℃ ~ 342 ℃, can work for a long time at a temperature of +250 ℃ to -180 ℃.

2. outstanding corrosion resistance – – able to withstand the action of all strong acids (including aqua regia), strong oxidizers, reducing agents and various organic solvents except molten alkali metals, fluorinated media and sodium hydroxide above 300°C.

3. extremely strong insulation resistance – – not affected by the environment and frequency, volume resistance up to 1018 ohms / cm, small dielectric loss, high penetration voltage.

4. Teflon tube unique self-smoothness – – has the smallest coefficient of friction in plastic, is the ideal oil-free smooth material.

5. Outstanding appearance of non-stick – – known solid materials can not adhere to the appearance, is a solid material with the smallest appearance.

6. Excellent atmospheric aging resistance, irradiation resistance and low permeability – – exposed to the atmosphere for a long time, the appearance and function remain unchanged.

7. Teflon tube valuable non-combustibility – – limited oxygen index below 90, incineration grade: V-0 grade.

 

 

 

 

 

 

 

 

 

 

 

Polyphenylene sulfide powder coating is a thermoplastic powder coating composed of polyphenylene sulfide resin, pigments, fillers and additives. Polyphenylene sulfide resin (polyphenylene sul ide) is a polymer molecule whose main chain structure is sulfur and aryl. Alternately connected high-molecular polymers have a chemical structure of 7S%, referred to as PPS, with a degree of formation up to 70%, a relative density of 1.36, a melting range of 280~290℃, and a glass transition temperature of about 90℃. It starts to decompose in the air above 430~460℃. In nitrogen, there is no obvious quality loss when heated below 500℃. Even at a high temperature of 1000℃, it still maintains 40% of its mass. It is insoluble below 200℃. Several organic solvents, polyphenylene sulfide resin is prepared by polycondensation of p-dichlorobenzene and sodium sulfide. The polycondensation reaction is as follows:

nClCIf nN as一+>-sk+nNac
Polyphenylene sulfide is a new type of engineering material with high temperature resistance, corrosion resistance and good mechanical processing properties. It is a new type of resin developed in recent years and has attracted attention at home and abroad because the resin is a repeated connection of benzene ring and sulfur. Structure, so the rigidity and heat resistance of the benzene ring structure, as well as the stability of the chemical bond between the benzene ring and sulfur, make polyphenylene sulfide extremely resistant to phosphoric acid, strong alkalis, and hydrofluoric acid. The layer has good compactness and good corrosion resistance. The maximum use temperature after crosslinking is 300℃. It can be used in chemical, petroleum, pharmaceutical, military, light industry, electronics, food, instrumentation and other industries, such as those used in various corrosive environments. Pumps, pipes, valves, reaction kettles, stirrers, condensers, storage tanks and non-stick pans, etc. This resin is only produced by a few industrially developed countries.

China has long been produced by Chongqing Changjiang Chemical Enamel Factory, Gansu Chemical Machinery Factory, Zigong Special It is produced by engineering plastics factory and other units. In August 2003, Sichuan Deyang built a production plant with an annual output of 10001. In order to meet the demand for polyphenylene sulfide resin, Sichuan Deyang Technology Co., Ltd. began to build an annual production capacity of 5000L in August 2005. The factory, Sichuan Deyang Technology Co., Ltd. and Sichuan Huatuo Industrial Development Co., Ltd. under Sichuan Huatuo Group Company are the largest domestic enterprises in the production and research of polyphenylene sulfide. At present, Huatuo Group produces coating grade, pp wax liquid injection grade, fiber grade, film grade and other varieties under the trademark of ll at on. Among them, the product grade of coating grade polyphenylene sulfide resin is pps-hao, which is pure resin, with a particle size of 200-400 mesh. White or nearly white powder. The product grades and technical indicators of polyphenylene sulfide resin used by a certain company for powder coatings are shown in Table 317. Among polyphenylene sulfide resins, those with a melt viscosity of less than 10Pa·s are used for thin coatings: melt viscosity 100~200Pas is used for thicker coatings; coatings with too large melt viscosity have poor leveling properties and are seldom used. Technical indicators of PPS 0205 for coatings of Ticona in the United States.

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