Nitrile adhesive cloth for manufacturers to introduce their production methods
From the nitrile adhesive cloth to the manufacturer, it is known that the nitrile adhesive cloth, also known as polyacrylonitrile fiber, has higher purity requirements for the raw material acrylonitrile, and the total content of various impurities should be less than 0.005%. The second monomer to be polymerized is mainly methyl acrylate, and methyl methacrylate may also be used for the purpose of improving the spinnability and the hand, softness and elasticity of the fiber; the third monomer is mainly to improve the dyeability of the fiber. It is generally itaconic acid containing a weakly acidic dyed group, sodium of propylenesulfonic acid containing a strongly acidic dyed chromophore, sodium methacrylate sulfonate, sodium methacryloyl benzene sulfonate, A -methylvinylpyridine or the like containing a basic dyed group.
From the nitrile adhesive cloth to the manufacturer, it is known that the polymerization process is divided into two types: suspension polymerization with water as a medium and solution polymerization with a solvent as a medium. The polymer obtained by suspension polymerization is precipitated in a flocculent form, and a spinning solution prepared by dissolving in a solvent is required. The solvent used in the solution polymerization dissolves both the monomer and the polymer, and the resulting polymer is directly used for spinning. The solvent used for the solution polymerization is dimethylformamide, dimethylsulfone, sodium thiocyanate, and zinc chloride. The polymerization time of the two organic solvents before use is generally 10h or more, but the concentration of the strong spinning solution having a high solubility is high, the spinning speed can be appropriately increased, and the solvent recovery is also relatively simple, and the obtained fiber is dimensionally improved. The performance is better, and the quality of the material of the equipment is lower; while the latter two inorganic solvents are used, the polymerization time is only required for 2 hours, and the whiteness of the obtained fiber is good.
From the nitrile adhesive cloth to the manufacturer, the nitrile adhesive cloth market, the spinning solution is generally a polyacrylonitrile polycondensate, the number average molecular weight is 53000 ~ 106000, the fiber white is better, the thermal decomposition temperature is 200 ~ 250 ° C , the melting point of 320 ° C. Therefore, the polyacrylonitrile fiber is obtained by wet spinning and dry spinning of a high polymer solution. The spinning solution has a spinning solution concentration of 25% to 30%, and the spinning speed is fast, but the fine flow of the spinneret is slow to cure, and the bonding is easy before curing, and the number of holes cannot be used. A plurality of spinnerets, a dimethylformamide-only type of spinning solvent, the structure of the obtained fibers is uniform and compact, and is suitable for woven silk fabrics. Wet spinning is suitable for making short fibers. The fiber blister is loose and soft. It is suitable to weave the wool fabric. The spinning solvent used in addition to the solvent for solution polymerization, there are two methyl acetamide and carbonic acid. Most of the solvents have a high boiling point and are not easily distilled out during the spinning process.
From the nitrile adhesive cloth to the manufacturer, it was known that in the 1980s, the polyacrylonitrile fiber produced by the melt spinning method was used, and the water was used as the plasticizer of the polymer, and the prepared polymer solution was not needed, and the dissolution was omitted. The recovery and recycling system of the agent, the physical properties of the fiber is basically the same as that of the dry or wet spinning fiber, and has entered the intermediate test stage.
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