Feeding pipe of reactor for continuous polymerization production of spandex

Abstract

The invention relates to a feeding pipe of a reactor for continuous polymerization production of spandex. The pipe comprises a feeding pipe body (1), a mixed amine feeding pipe (2), a prepolymer feeding pipe (3), an end surface flange cover (4) and a manual doctor blade system (5), wherein the feeding pipe main body (1) comprises a main feeding pipe (1.3), a first flange (1.1) and a second flange(1.2); the mixed amine feeding pipe (2) comprises a mixed amine pipe (2.2) and a third flange (2.1), the third flange (2.1) is mounted at one end of the mixed amine pipe (2.2), and the mixed amine pipe (2.2) is arranged in the main feeding pipe (1.3); the prepolymer feeding pipe (3) comprises a prepolymer feeding branch pipe (3.1) and a fourth flange (3.2); the end surface flange cover (4) is connected with the outer end of the second flange (1.2); and the manual doctor blade system (5) comprises a handle (5.1), a first link rod (5.2), an eccentric crank (5.3), a second link rod (5.4) and a doctor blade (5.5). The feeding pipe of the reactor is reliable in performances, does not need to be cleaned regularly and can prevent the continuous generation of gumming phenomenon during the production.

Description

technical field [0001] The invention relates to a feed pipe of a reactor for polymer polymerization, in particular to a feed pipe of a reactor specially used for the continuous polymerization production of spandex. The invention belongs to the technical field of special equipment for continuous polymerization of spandex. Background technique [0002] The urethane polymer solution used in the production of spandex fiber spinning is realized through a two-step reaction; first, the excess diisocyanate reacts with polyethylene glycol ester to form an isocyanate-terminated low-molecular-weight polymer, which is commonly referred to as prepolymer. In the second step, the prepolymer reacts with the diamine mixture in the solution to form a high molecular weight urethane polymer, adjust the stoichiometry of the reaction, and stop the chain extension reaction of the polymer molecule in time, thus obtaining the ideal amino acid Formate polymer solution, commonly known as spinning do...

AI Technical Summary

Problems solved by technology

[0004] The traditional feeding pipe has always had major defects, mainly in the violent reaction between the prepolymer (referred to as PP) and the diamine mixture (referred to as Anmine) at the moment of flowing out from the outlet end of the feeding pipe, making the feeding pipe A certain degree of gelation often occurs at the discharge end of the reactor, which is a slow and non-stop process, which makes the gelation worse during the production process, blocks the feed channel, and makes the material enter the reactor. There are irregular pressure fluctuations in the process, which affects the uniformity of product quality, and the continuous gelation makes the cleaning interval of the equipment very short. In the busy production, it is often necessary to stop cleaning due to the problem of the feeding pipe , which has a relatively large adverse effect on production

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