Testing of acrylic knitted underwearHow to apply for a report? What items need to be tested? We will conduct testing and evaluation in strict accordance with the standards. We can also provide personalized testing plans and reports according to your needs.

Synthetic fibers made from polyacrylonitrile or acrylonitrile copolymers with an acrylonitrile content greater than 85% (mass percentage). The commonly used second monomer is a non ionic monomer, such as methyl acrylate, methyl methacrylate, etc., while the third monomer is an ionic monomer, such as sodium propylene sulfonate

Production method

Polyacrylonitrile fiber has a high requirement for the purity of the raw material acrylonitrile, and the total content of various impurities should be less than 0.005%.

Polymerization

The polymerization process is divided into two types: suspension polymerization using water as the medium and solution polymerization using solvent as the medium.

. The polymer obtained from suspension polymerization precipitates in flocculent form and needs to be dissolved in a solvent to prepare a spinning solution. The solvent used for solution polymerization can dissolve both monomers and polymers, and the resulting polymer solution is directly used for spinning. The solvents used for solution polymerization include dimethyl formamide, dimethyl sulfoxide, sodium thiocyanate, and zinc chloride. The polymerization time using the first two organic solvents is generally over 10 hours, but the concentration of the strong solubility spinning solution is relatively high, which can appropriately increase the spinning speed. The solvent recovery is also relatively simple, and the resulting fiber has good performance, and the material requirements for the equipment are relatively low; However, using the latter two inorganic solvents, the polymerization time only takes 2 hours, and the resulting fiber has a good whiteness Spinning

Test report function

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