Modification method and spinning process for polyethylene naphthalate

Abstract

The invention relates to a modification method for polyethylene naphthalate, which comprises the two steps of PEN crystallization treatment and PEN-CXT blending, wherein the PEN crystallization treatment comprises the two sub-steps of pre-crystallization and solid phase polycondensation; the blending comprises the two sub-steps of mechanical mixing and heating to form a melt; and a finally obtained PEN-CXT uniformly-mixed melt is a modified PEN melt. The invention also relates to a spinning process for the polyethylene naphthalate, which comprises the three steps of PEN crystallization treatment, PEN-CXT blending and spinning, wherein the PEN crystallization treatment comprises the two sub-steps of pre-crystallization and solid phase polycondensation; the blending comprises the two sub-steps of mechanical mixing and heating to form a melt; and the CXT-PEN uniformly-mixed melt is processed by an industrial PEN yarn melting spinning process to finally obtain industrial PEN yarns under the conditions that: the temperature of a melting area is set to be 290 to 300 DEG C, the temperature of a homogenization area is set to be 283 to 295 DEG C, the temperature of front drafting rollers is kept to be 210 to 240 DEG C, the temperature of drafting rollers is 220 to 245 DEG C and a spinning speed is 3 to 6km / min. The modification method and the spinning process can greatly improve the mobility of the PEN at a relatively lower temperature, ensure that molecules are easy to orient, enhance the crystallization power of the PEN and hardly influence the mechanical properties of the PEN.

Description

technical field [0001] The present invention relates to the preparation of an industrial yarn, a modification method and spinning process of polyethylene naphthalate, in particular to a modification of polyethylene naphthalate to improve spinning performance. Sexual method and spinning process. Background technique [0002] Polyethylene naphthalate (PEN) is a high-performance thermoplastic polyester with a naphthalene ring as the backbone. Its structure is similar to that of PET. Due to the existence of the naphthalene ring, the conjugated structure of PEN is larger and the molecular chain is more rigid. High, the structure is more planar, so that it has excellent performance incomparable to PET. Compared with PET, PEN has excellent mechanical properties, and PEN has higher tensile strength, flexural strength, and flexural modulus of elasticity. Moreover, its elastic modulus, strength, creep and life can remain relatively stable in high-temperature, high-humidity environme...

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Problems solved by technology

However, there are currently no reports and studies on the application of CBT to the industrial silk spinning process in relevant literature, and there is no similar substance similar to CBT applied to the melting and spinning of PEN.

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