CN-121988202-A - Film forming devolatilization device

CN121988202ACN 121988202 ACN121988202 ACN 121988202ACN-121988202-A

Abstract

The invention discloses a film forming devolatilization device which is characterized by comprising a shell, wherein a devolatilization cavity for materials to pass through is formed in the shell, at least two rotatable stirring shafts are arranged in the devolatilization cavity side by side, and each stirring shaft is respectively close to the adjacent stirring shaft. The film forming devolatilization device has the beneficial effects that the rotatable stirring shafts are arranged in the shell, so that the stirring shafts can bring up materials to form thinner material films, the evaporation area of the materials is increased, small molecular substances contained in the materials are fully devolatilized, the materials treated by the film forming devolatilization device can be directly subjected to spinning or subsequent production and processing, the process flow is shortened, the production energy consumption is reduced, the environment is friendly, in addition, the evaporation area of the materials is further improved by arranging the stirring shafts side by side, and in the operation process of the film forming devolatilization device, the adjacent stirring shafts can be matched with each other to scrape the materials, so that the film forming devolatilization device has good material surface updating and self-cleaning capabilities.

Inventors

SONG KAIZHUO
CHI KEDONG
JIANG FENG
JIA ZHENYU
LI HONGBIN
WANG GENLI
LI SHAOJIE
HU ZHIYU
WANG HAIMING
XU JIGANG

Assignees

中国纺织科学研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (10)

1. The film forming devolatilization device is characterized by comprising a shell (1), wherein a devolatilization cavity (110) for materials to pass through is formed in the shell (1), at least two rotatable stirring shafts (2) are arranged in the devolatilization cavity (110) side by side, and each stirring shaft (2) is respectively close to the adjacent stirring shaft (2).
2. The film forming devolatilization apparatus as claimed in claim 1, wherein the stirring shaft (2) comprises a rotating shaft (210) rotatably connected with the housing (1) and stirring structures (220) protruding from the peripheral side walls of the rotating shaft (210), wherein the adjacent rotating shafts (210) are arranged at a certain distance from each other, and the stirring structures (220) on each rotating shaft (210) are respectively close to the peripheral side walls of the adjacent rotating shafts (210); Or the stirring shaft (2) is a stepped shaft with the diameter of the middle section larger than that of the two ends, and the peripheral side wall of the middle section of each stepped shaft is respectively close to the peripheral side wall of the middle section of the adjacent stepped shaft.
3. The film forming devolatilization apparatus as claimed in claim 2, wherein each of the rotary shafts (210) is provided with a plurality of stirring structures (220) arranged at intervals in the axial direction, respectively, and the stirring structures (220) of each rotary shaft (210) are partially located in the interval spaces between the stirring structures (220) of adjacent rotary shafts (210); Preferably, the stirring structures (220) of two adjacent rotating shafts (210) are respectively arranged in an axial staggered manner.
4. A film forming devolatilization apparatus as claimed in claim 3, characterized in that the stirring structure (220) comprises a connection portion (221) extending radially outwardly from the peripheral side wall of the rotary shaft (210), and scrapers (222) provided on the extending end faces of the connection portion (221), the length of each scraper (222) in the axial direction of the stirring shaft (2) being greater than the length of the connection portion (221) in the same direction; Or the stirring structures (220) only comprise connecting parts (221) which extend outwards from the peripheral side wall of the rotating shaft (210) in the radial direction, and two side walls on the axial direction of each connecting part (221) are respectively close to corresponding connecting parts (221) of the adjacent stirring structures (220). Preferably, at least two scrapers (222) are circumferentially arranged on the outer peripheral portion of the connecting portion (221).
5. The film forming devolatilization apparatus as claimed in claim 4, wherein each of the blades (222) is respectively in a shape of a bar, and a length direction of the bar-shaped blade (222) is perpendicular to a radial direction of the corresponding stirring shaft (2); Preferably, the length direction of the strip-shaped scraper (222) is parallel to the axis of the stirring shaft (2) or forms a certain included angle with the axis of the stirring shaft (2); preferably, the scrapers (222) on each stirring shaft (2) are respectively arranged parallel to the axis or spirally arranged around the axis.
6. The film forming devolatilizer as claimed in claim 4 or 5, wherein the connection portion (221) comprises, At least two first connection portions (221 a) circumferentially arranged on a circumferential side wall of the rotating shaft (210) and extending in radial directions, respectively; At least one second connection portion (221 b), each second connection portion (221 b) provided in the extending direction of the first connection portion (221 a) is connected to the extending end of at least two first connection portions (221 a), respectively; Preferably, communication holes (223) are distributed on the side wall of each second connection part (221 b) facing one end of the shell (1).
7. The film forming devolatilizer as claimed in claim 6, wherein the second connection portion (221 b) of each connection portion (221) extends along the circumferential direction of the rotary shaft (210), and an inner peripheral portion of the second connection portion (221 b) is connected to an extension end of each first connection portion (221 a); preferably, the second connecting part (221 b) is an annular structure with a circle formed by connecting the head and the tail; preferably, the second connecting portion (221 b) has a fan-shaped ring structure.
8. The film forming devolatilization apparatus as claimed in claim 6, wherein at least part of the first connection portions (221 a) are projected in the extending direction to coincide with at least part of the doctor blades (222), respectively.
9. A film forming devolatilizer as claimed in any one of claims 1-8, in which each stirring shaft (2) is disposed adjacent to a chamber wall of the devolatilization chamber (110); Preferably, the devolatilization cavity (110) is divided into a matching cavity (111) and an exhaust cavity (112) from bottom to top, the cavity wall of the matching cavity (111) is close to each stirring shaft (2) in shape matching with each stirring shaft (2), and a certain distance is formed between the cavity wall of the devolatilization cavity (110) and each stirring shaft (2); More preferably, the chamber wall of the devolatilization chamber (110) is provided with a vent (140) communicated with the outside.
10. A film forming devolatilization apparatus as claimed in any one of claims 1 to 9, in which adjacent stirring shafts (2) are rotated in the same direction or in opposite directions, respectively.

Description

Film forming devolatilization device Technical Field The invention belongs to the field of chemical equipment, and particularly relates to a film forming devolatilization device. Background In the production process of high-molecular polymer, the high-molecular polymer contains small molecular substances such as small molecular byproducts and monomer raw materials, the existence of the small molecular substances can influence the continuous operation of high subsequent reaction and influence the efficiency and yield of production and processing, and especially for condensation polymers such as nylon 6, when the reaction reaches equilibrium, the polymerization product is about 90% of nylon 6 and 10% of extractable small molecular substances, and caprolactam monomers in the small molecular substances account for about 80% and oligomers account for about 20%. Because of the existence of the extractable low molecular substances, the spinning cannot be directly performed, and the spinning can be performed only after a series of impurity removal procedures of pelleting, extraction, drying and remelting are sequentially performed after the pre-polymerization and post-polymerization procedures are completed. The steps occupy a large amount of time, generate higher energy consumption and a large amount of wastewater which can be discharged after being treated, so that the nylon 6 fiber production process has the problems of long process flow and high production cost. The present invention has been made in view of this. Disclosure of Invention The invention aims to solve the technical problems of overcoming the defects of the prior art, and providing a film forming devolatilization device, wherein a rotatable stirring shaft is arranged in a shell, so that materials in a devolatilization cavity move along with the surface of the stirring shaft, a material film is formed on the surface of the stirring shaft, thereby increasing the evaporation area of the materials, enabling small molecular substances contained in the materials to be devolatilized sufficiently, replacing the impurity removing procedure required to be executed after a post polymerization procedure, thereby reducing the problems of long technological flow and high production cost in the existing production process, and in addition, a plurality of stirring shafts are arranged, so that all stirring shafts can be cleaned mutually in the operation process of the film forming devolatilization device, and the problem that the materials are adhered on the stirring shaft is solved. In order to solve the technical problems, the basic conception of the technical scheme adopted by the invention is that the film forming devolatilization device comprises a shell, wherein a devolatilization cavity for materials to pass through is formed in the shell, at least two rotatable stirring shafts are arranged in the devolatilization cavity side by side, and each stirring shaft is respectively close to the adjacent stirring shaft. The stirring shaft comprises a rotating shaft connected with the shell in a rotating way and a stirring structure protruding out of the peripheral side wall of the rotating shaft, wherein the adjacent rotating shafts are arranged at a certain distance, and the stirring structures on the rotating shafts are respectively close to the peripheral side wall of the adjacent rotating shafts; Or the stirring shaft is a stepped shaft with the diameter of the middle section larger than that of the two ends, and the peripheral side wall of the middle section of each stepped shaft is respectively close to the peripheral side wall of the middle section of the adjacent stepped shaft. Further, each rotating shaft is provided with a plurality of stirring structures in an axial interval manner, and the stirring structure part of each rotating shaft is positioned in an interval space between the stirring structures of the adjacent rotating shafts; Preferably, the stirring structures of two adjacent rotating shafts are respectively arranged in an axial staggered manner. Further, the stirring structure comprises a connecting part which extends radially outwards from the peripheral side wall of the rotating shaft, and scrapers arranged on the end face of the extending end of the connecting part, wherein the length of each scraper in the axial direction of the stirring shaft is greater than that of the connecting part in the same direction; or the stirring structure only comprises connecting parts which extend outwards from the peripheral side wall of the rotating shaft in the radial direction, and two side walls of the axial side of each connecting part are respectively close to corresponding connecting parts of the adjacent stirring structures. Preferably, at least two scrapers are circumferentially arranged on the outer peripheral portion of the connecting portion. Further, each scraper is respectively in a strip shape, and the length direction of the strip-shaped scrap