News Details
Fluorine coating crosslinking agent
2017-7-9 15:29:11
Fluorine coating crosslinking agent
Fluoride crosslinking agent PTFE LOI up to 95, is the highest LOI commonly used polymer compounds, only in pure oxygen combustion. Fluoride compounds release less particles, low smoke, if the fluorine element into the epoxy resin can improve the flame retardant and smoke suppression performance of epoxy resin. But its synthetic difficulties, high cost, has not yet been widely used.
(3-nitro-4-hydroxyphenyl) hexafluoropropane, a new fluorine-containing epoxy resin crosslinking agent was synthesized by the reaction of palladium on carbon, hydrazine hydrate and organic solvent. 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane (BAHPFP).
Fluoride Crosslinker Polytetrafluoroethylene (PTFE), commonly known as "non-stick coating" or "easy to clean materials." This material has acid and alkali resistance, anti-organic solvent characteristics, almost insoluble in all solvents. At the same time, Teflon has a high temperature characteristics, its friction coefficient is very low, so can be used for lubrication, but also become easy to clean the inner layer of the ideal coating.
Polytetrafluoroethylene has a relatively high molecular weight, a low number of hundreds of thousands, a height of more than 10 million, typically several million (the degree of polymerization is on the order of 10 ^ 4, while the polyethylene is only 10 ^ 3). General crystallinity of 90 ~ 95%, melting temperature of 327 ~ 342 ℃. The CF2 units in the Teflon molecule are arranged in a zigzag shape. Since the radius of the fluorine atom is slightly larger than that of the carbon, the adjacent CF2 units can not be completely cross-oriented, but form a helical twisted chain with almost fluorine atoms The entire surface of the polymer chain. This molecular structure explains the various properties of polytetrafluoroethylene. When the temperature is below 19 ° C, a 13/6 helix is ??formed; a phase change occurs at 19 ° C and the molecule is slightly unfastened to form a 15/7 helix.
Polytetrafluoroethylene has "cold flow". That is, the plastic deformation (creep) of the material produced under long continuous load, which brings some restrictions to its application. If PTFE is used as a gasket, tighten the bolt tightly so that it exceeds the specific compressive stress, it causes the gasket to "cool" (creep) and be flattened. These shortcomings can be overcome by adding the appropriate packing and improving the part structure.
PTFE has a prominent non-stick, limiting its industrial applications. It is an excellent anti-sticking material, which makes it extremely difficult to bond it to the surface of other objects.
PTFE linear expansion coefficient of steel 10 to 20 times larger than most plastics, the linear expansion coefficient with the temperature changes occur very irregular changes. In the application of PTFE, if the performance of this area is not enough attention, it is easy to cause losses.
Chinese name: Diethyl toluene diamine(DETDA)Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
Polytetrafluoroethylene in the -196 ~ 260 ℃ within a wide range of temperature to maintain excellent mechanical properties, perfluorocarbon polymer is one of the characteristics of low temperature does not brittle.
PTFE density is large, 2.14 a 2. 20g / cm3, almost no water, the balance of water absorption is less than 0. 01%.
Polytetrafluoroethylene is a typical soft and weak polymer, macromolecules between the smaller gravitational attraction, stiffness, hardness, strength are small, in the long-term stress will be deformed.
Teflon is prone to creep when loaded, and is a typical plastic with cold flow. The creep of PTFE varies with compressive stress, temperature and crystallinity, and the higher the temperature, the greater the creep. The crystallinity of PTFE is between 55% and 80%, and the creep is not more than 2%. When the crystallinity is below 55% and 80%, the creep increases rapidly.
Teflon mechanical properties of the excellent characteristics of the friction factor is small, between 0. 01 and 0.10, in the existing plastic materials, and even the smallest of all engineering materials.
The friction factor of PTFE increases with the increase of the sliding rate, and becomes stable when the linear velocity reaches 0. 5 to 1. 0 m / s, and the static friction factor is less than the dynamic friction factor. This characteristic is used for bearing manufacturing. Reduce its starting resistance, so that from start to run are very smooth.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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