Extinction spinning production process for polylactic acid slice with titanium dioxide

Abstract

The invention discloses an extinction spinning production process for polylactic acid slices with titanium dioxide. The extinction spinning production process comprises the following steps: (1) adding a catalyst, a stabilizing agent and lactide into a stirring tank; (2) preheating a lactide mixture by using a polylactic acid pre-polymerization mixing device, and performing primary mixing in a pre-polymerization tank; (3) performing final polymerization in a final polymerization tank; (4) producing polylactic acid slices (5), mixing dry titanium dioxide powder with the polylactic acid slices, dropping into a spinning screw extruder, and mixing by using a moving-static integrated pipeline mixing device; (6) spinning molten polylactic acid into extinction or semi-extinction extinction fiber by using a spinning component. Only a plurality groups of mixing units are arranged on a third conveying tube directly, a mixing system mounted on the conveying tube is canceled, the cost is reduced, the purpose of uniformly mixing materials can be achieved, and the conveying and mixing efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid polymerization, and in particular relates to a polylactic acid slice adding titanium dioxide matting spinning production process. Background technique [0002] The polylactic acid polymerization process includes prepolymerization and final polymerization. The melt that needs to be polymerized must first undergo pre-polymerization. The pre-polymerization equipment is a vertical cylinder-shaped tank, and the top of the tank is provided with a pre-polymerization pipe along the vertical direction. The melt that needs to be pre-polymerized enters the pre-polymerization tube quantitatively from the upper end of the pre-polymerization tube, and flows down into the tank smoothly from top to bottom by its own gravity. Due to the friction factor between the melt and the wall of the pre-polymerization tube, the downward flow velocity of the melt at the center of the pre-polymerization tube is faster...

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Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention provides a method that can keep the melt at the inner wall and the center of the pre-polymerization tube flowing downward at a substantially constant speed, and can keep the melt at the inner wall and the center of the pre-polymerization tube flowing downward. Exchanging and mixing to keep the temperature consistent and uniformly mixed in the conveying process after final polymerization Polylactic acid chip adding titanium dioxide matting spinning production process

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