Melt spun spandex waste silk reusing method

Abstract

The invention discloses a kind of melt to spin the ammonia black silk ribbon waste silk again use the method, including following step: Will melt spins the ammonia black silk ribbon waste silk to join the high boiling point reagent, then will join has the reactive hydrogen the compound; Under the inert atmosphere, responded 0.4-4 hour, the reaction temperature is 160-220 DEG C, obtains the decadent thick liquid; Then will liquefy the melt will spin the ammonia black silk ribbon waste silk raw material to use conventional the method and the polyether two is mellow or the polyester two mellow two isocyanogens diethylene glycol dinitrate responded that, rewill produce the polyurethane elastomer. The invention method, may melt spins the ammonia black silk ribbon waste silk reto recycle the use, moreover the operating process simple is convenient, may solve the waste silk which in the production process produces to cause the serious environmental pollution the question, has the bigger industrialization application prospect.

Description

technical field

[0001] The invention relates to a method for recycling waste silk of melt spinning spandex. Background technique

[0002] Spandex melt spinning has become the most economical and environmentally friendly new spandex production technology due to its advantages such as simple process flow, low equipment investment, high production efficiency, no solvent used in the production process, and less environmental pollution.

[0003] The production of spandex by melt-spinning technology was initially industrialized by Japan’s Nisshinbo Corporation. Subsequently, Japan’s Bell Spinning Company and Kuraray Company successively developed their own melt-spinning spandex production processes. In recent years, my country's research on spandex melt spinning has also started, and industrialization has been realized, and the output has increased year by year. At the same time, the waste silk produced in the production process has caused serious environmental pollution problems...

Examples

Embodiment 1

[0016] Add 40 grams of triethyl phosphate into a 250 ml three-necked flask equipped with reflux condensation, then add 20 grams of polyether-type melt-spun spandex waste silk and 2 grams of acetamide, and react for 1 hour under nitrogen and mechanical stirring , the reaction temperature was controlled at 180°C, and a yellow viscous liquid was obtained after the reaction was completed. The intrinsic viscosity is 0.176dl / g.

Embodiment 2

[0018] The operation process was the same as in Example 1, and the reaction temperature was raised to 200° C. to obtain a yellow viscous liquid with an intrinsic viscosity of 0.145 dl / g.

Embodiment 3

[0020] The operation process was the same as in Example 1, the reaction temperature was lowered to 160° C., and the intrinsic viscosity of the pale yellow viscous liquid obtained was 0.455 dl / g.

technical field

[0001] The invention relates to a method for recycling waste silk of melt spinning spandex. Background technique

[0002] Spandex melt spinning has become the most economical and environmentally friendly new spandex production technology due to its advantages such as simple process flow, low equipment investment, high production efficiency, no solvent used in the production process, and less environmental pollution.

[0003] The production of spandex by melt-spinning technology was initially industrialized by Japan’s Nisshinbo Corporation. Subsequently, Japan’s Bell Spinning Company and Kuraray Company successively developed their own melt-spinning spandex production processes. In recent years, my country's research on spandex melt spinning has also started, and industrialization has been realized, and the output has increased year by year. At the same time, the waste silk produced in the production process has caused serious environmental pollution problems...

Examples

Embodiment 1

[0016] Add 40 grams of triethyl phosphate into a 250 ml three-necked flask equipped with reflux condensation, then add 20 grams of polyether-type melt-spun spandex waste silk and 2 grams of acetamide, and react for 1 hour under nitrogen and mechanical stirring , the reaction temperature was controlled at 180°C, and a yellow viscous liquid was obtained after the reaction was completed. The intrinsic viscosity is 0.176dl / g.

Embodiment 2

[0018] The operation process was the same as in Example 1, and the reaction temperature was raised to 200° C. to obtain a yellow viscous liquid with an intrinsic viscosity of 0.145 dl / g.

Embodiment 3

[0020] The operation process was the same as in Example 1, the reaction temperature was lowered to 160° C., and the intrinsic viscosity of the pale yellow viscous liquid obtained was 0.455 dl / g.