The invention relates to a preparation method of a high-strength high-modulus
polyethylene fiber, which comprises the following steps:
ultra high molecular weight polyethylene powder with the molecular weight of 1.5 to 8 million is mixed with a
solvent according to a
mass ratio of 1 to 10: 100 and is mixed with an anti-
oxygen agent to be hated and mixed in a
mixing tank, the quantity of the anti-
oxygen agent is 2 to 5 percent of the solute
mass, the
heating temperature is 100 to 200 DEG C, the
powder is adequately dissolved to obtain the
ultra high molecular weight polyethylene solution, the
ultra high molecular weight polyethylene is naturally cooled to form gel blocks, the gel blocks are taken out to be smashed into particle
powder with partial
solvent is removed so as to obtain a ultra high molecular weight
polyethylene spinning raw material with the
solid content of 20 to 70 percent by weight, the prepared ultra high molecular weight
polyethylene spinning raw material is inputted to a screw to be melt and to extrude filature, and the filature is pre-stretched and coiled, and then is leached, dried and hot stretched to obtain the high-strength high-modulus polyethylene
fiber with the fracture strength of 20 to 50 cN / dtex and the modulus of 450 to 1250 cN / dtex. The preparation method solves the problems of the prior art that the molecular weight is seriously reduced and the efficiency of the screw is low during the
spinning process of the high-strength high-modulus polyethylene
fiber, and overcomes the weaknesses of the prior art that the
toxicity is serious, the environment is polluted and the production cost is high.