CN218924355U - Stirring device for high-viscosity polyvinyl alcohol polymer - Google Patents

Abstract

The utility model relates to the technical field of stirring devices, and particularly discloses a stirring device for a high-viscosity polyvinyl alcohol polymer, which comprises a stirring shaft arranged in a container and a driving device for driving the stirring shaft to rotate, wherein a plurality of connecting rods are arranged on the stirring shaft, the connecting rods are distributed along the axis direction of the stirring shaft, and the axis of the connecting rods is mutually perpendicular to the axis of the stirring shaft; two spiral belts are sleeved on the stirring shaft and are fixedly connected with two ends of the connecting rod respectively; two baffle plates are symmetrically arranged on the stirring shaft, the baffle plates are positioned above the screw belt, and the free ends of the baffle plates incline downwards. By adopting the technical scheme provided by the utility model, the technical problem that the high-viscosity polyvinyl alcohol is difficult to prepare due to uneven molecular weight distribution of the materials caused by uneven stirring of the high-viscosity materials in the prior art can be solved.

Description

Stirring device for high-viscosity polyvinyl alcohol polymer

Technical Field

The utility model relates to the technical field of stirring devices, in particular to a stirring device for a high-viscosity polyvinyl alcohol polymer.

Background

Polyvinyl alcohol is a high molecular polymer with water solubility, has good properties of fiber forming property, cohesiveness, film forming property, transparency, emulsion stability, dispersion stability, oil resistance, acid and alkali resistance, chemical reactivity, biodegradability and the like, and is mainly used in industries of textile, medicine, fiber, film, adhesive and the like. The molecular structure is simple, the modification is easy, and the application range is in a trend of continuous expansion.

The initial raw material for producing polyvinyl alcohol is acetylene, which is used to react with acetic acid to produce vinyl acetate, and then the polyvinyl acetate is produced through solution polymerization. The polyvinyl acetate and the sodium hydroxide methanol solution are mixed at high speed, alcoholysis is carried out at 50 ℃, solid polyvinyl alcohol is obtained after separation after the alcoholysis is finished, and the polyvinyl alcohol product is obtained after crushing, squeezing, drying and solvent removal. In the process of generating polyvinyl acetate by solution polymerization and obtaining polyvinyl alcohol by alcoholysis of the polyvinyl acetate, the viscosity of the material is very high, and the material is required to be stirred by using a stirring device so as to ensure that the materials are uniformly mixed and fully react.

In the process of synthesizing polyvinyl alcohol, crescent, paddle and anchor frame stirring devices are commonly adopted. For example, the patent of CN205146057 discloses a stirring device for dissolving high-viscosity polyvinyl alcohol resin, which comprises a stirring unit, a transmission unit and a heat exchange unit, wherein the stirring unit is formed by a motor, a speed reducer, a coupling and a frame, the hollow stirring shaft extending into the container drives a stirrer in the container to rotate, the transmission unit drives the stirring unit through the coupling, and the heat exchange unit circulates through a rotary joint, a connecting pipeline and a valve to heat the rotating hollow stirring shaft. The device is used for preparing the polyvinyl alcohol, so that the high-viscosity material can be stirred, and the distribution uniformity of molecular weight is improved, thereby obtaining the high-viscosity polyvinyl alcohol.

However, the above prior art also has the following drawbacks:

1. although the stirrer design of the combination of the blade type and the anchor frame type can obtain larger stirring thrust so as to realize the stirring of the high-viscosity material, when the polyvinyl acetate is stirred to prepare the polyvinyl alcohol, the material hardly flows up and down in a container, so that the high-viscosity material is difficult to stir uniformly, the molecular weight distribution of the material is uneven, and the high-viscosity polyvinyl alcohol is difficult to prepare.

2. In order to prevent the pole-climbing effect (namely, the axle-wrapping phenomenon) from occurring in the stirring process, the stirring shaft is designed into a hollow structure to realize the heat medium circulation, so that the stirring shaft keeps certain high temperature, on one hand, the structural strength of the stirring shaft can be reduced, the upper limit of the viscosity of materials which can be suitable for stirring is reduced, on the other hand, the structure of the whole stirring device is complicated, and the front-stage processing and the later-stage maintenance are inconvenient.

Disclosure of Invention

The utility model aims to provide a stirring device for a high-viscosity polyvinyl alcohol polymer, which aims to solve the technical problem that the high-viscosity polyvinyl alcohol is difficult to prepare due to uneven molecular weight distribution of materials caused by uneven stirring of the high-viscosity materials in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the stirring device for the high-viscosity polyvinyl alcohol polymer comprises a stirring shaft and a driving device for driving the stirring shaft to rotate, wherein a plurality of connecting rods are arranged on the stirring shaft and are distributed along the axis direction of the stirring shaft; two spiral belts are sleeved on the stirring shaft and are fixedly connected with two ends of the connecting rod respectively; two baffle plates are symmetrically arranged on the stirring shaft, the baffle plates are positioned above the screw belt, and the free ends of the baffle plates incline downwards.

The principle and the advantages of the scheme are as follows:

1. during practical application, the driving device drives the stirring shaft to rotate, the stirring shaft drives the two spiral belts to rotate, the spiral belts can stir materials, the materials flow along the axial direction of the stirring shaft, the materials are enabled to be mixed in an up-down movement mode, the stirring uniformity of the materials, particularly high-viscosity materials, is effectively improved, the molecular weight uniformity of the materials can be improved through uniform stirring in the process of preparing the polyvinyl alcohol, the materials are enabled to fully react, and therefore the high-viscosity polyvinyl alcohol is prepared smoothly.

2. Two spiral bands sleeved on the stirring shaft are fixedly connected to the two ends of the connecting rod respectively, namely, the two spiral bands are not overlapped, so that the two spiral bands can generate different stirring directions, the high-viscosity materials generate different flowing directions, and the high-viscosity materials achieve better mixing effects through continuous convection circulation and shearing mixing, so that the stirring uniformity of the stirring device to the high-viscosity materials can be effectively improved, the materials can fully react, and the high-viscosity polyvinyl alcohol can be smoothly prepared.

3. Two baffle plates are symmetrically arranged on the stirring shaft and are arranged above the spiral belt, so that in the process of stirring materials, if the high-viscosity materials climb upwards along the stirring shaft, namely the climbing rod effect occurs, the high-viscosity materials climbing to the baffle plates can be blocked by the baffle plates and flow back to the spiral belt stirring area along the inclined baffle plates, and the materials are continuously stirred by the spiral belt; this scheme not only can avoid the material to follow (mixing) shaft climbing to other structures such as drive arrangement department, causes the interference to the work of other structures, can increase the flow path of material to a certain extent moreover, improves the mixed degree of material.

4. When the material has the pole climbing effect, as the stirring shaft is driven by the driving device to continuously rotate, the material can present a spiral climbing trend when climbing upwards along the stirring shaft, the two baffle plates are symmetrically arranged on the stirring shaft, and the line of the material can pass through the baffle plates in the spiral climbing process of the material along the stirring shaft, so that the material can be intercepted by the baffle plates to stop climbing, and the baffle plates can achieve the effect of preventing the material from continuously climbing; compared with the circumference at the (mixing) shaft all sets up the separation blade in this scheme, can save the preparation material of separation blade to alleviate overall weight, thereby alleviate drive arrangement's load.

Preferably, as an improvement, the driving device is a variable frequency motor.

According to the scheme, when the variable frequency motor is used as a driving device, during the preparation of the polyvinyl alcohol, in the process of generating the polyvinyl acetate through solution polymerization, the viscosity of materials is changed from small to large along with the progress of polymerization reaction, the rotating speed of the motor can be adaptively adjusted down, so that the moment of the motor is increased to increase the stirring shearing force, and the materials with the increased viscosity can be uniformly stirred, so that the materials can continuously and fully react in the follow-up process; in the process of obtaining polyvinyl alcohol through alcoholysis of polyvinyl acetate, the material can change phase from liquid to solid, and the rotating speed of the motor can be adaptively adjusted down again at the moment, so that the motor has larger moment, larger shearing force is generated to stir the material, and smooth and full alcoholysis process is ensured.

Preferably, as an improvement, the axis of the connecting rod is mutually perpendicular to the axis of the stirring shaft, and the two spiral bands are symmetrically arranged on the stirring shaft.

By adopting the scheme, the axis of the connecting rod is mutually perpendicular to the axis of the stirring shaft, and the length of the connecting rod can be shortened on the basis of unchanged distance between the screw belt and the connecting rod, so that the material consumption of the connecting rod is reduced, and the cost is controlled; the two spiral belts are symmetrically arranged on the stirring shaft, so that materials at all positions in the stirring kettle can be uniformly stirred in the process that the two spiral belts rotate along with the stirring shaft, the stirring uniformity of the materials is improved, the materials at all positions fully react, and the high-viscosity polyvinyl alcohol is smoothly prepared.

Preferably, as an improvement, a plurality of the connecting rods are positioned in the same plane, and the distance between two adjacent connecting rods is equal to the pitch.

Adopt this scheme, set up a plurality of connecting rods in the coplanar, and the distance design between two adjacent connecting rods equals with the pitch, then the connecting rod is in evenly distributed on the spiral shell area with the spiral shell area, has guaranteed the connection homogeneity of spiral shell area with the (mixing) shaft to improve the connection stability in spiral shell area, avoid the spiral shell area to be connected inhomogeneous with the (mixing) shaft, lead to the weak in-process of spiral shell area connection to receive the damage, be favorable to improving the life of spiral shell area.

Preferably, as a modification, the external diameter of the ribbon is equal to the pitch.

By adopting the scheme, the outer diameter of the spiral belt is designed to be equal to the screw pitch, so that the shearing and stirring of high-viscosity liquid and pseudo-plastic fluid are facilitated, the phenomenon of sticking and even holding of the rod is avoided, and the stirring operation of the reaction process of generating polyvinyl acetate by solution polymerization and obtaining the polyvinyl alcohol by alcoholysis of the polyvinyl acetate is adapted to the preparation of the polyvinyl alcohol.

Preferably, as an improvement, the diameter of the stirring shaft is 8-10 mm, the diameter is too small, the stirring shaft is easy to deform, the diameter is too thick, the stirring rod is too heavy, and the energy consumption is increased.

By adopting the scheme, the diameter of the stirring shaft is designed to be 8-10 mm, so that the stirring strength in the preparation process of the high-viscosity polyvinyl alcohol can be better adapted, and the phenomenon that the stirring shaft deforms in the stirring process due to the fact that the diameter of the stirring shaft is too small (smaller than 8 mm) is avoided, so that the stirring uniformity of materials is influenced; the diameter of the stirring shaft is also prevented from being too large (larger than 10 mm), so that the weight of the stirring rod is too heavy, the load of the variable frequency motor is increased, and the service life of the variable frequency motor is influenced.

Preferably, as a modification, the width of the ribbon is 8mm to 15mm.

By adopting the scheme, the width of the ribbon is designed to be 8-15 mm, and the proper ribbon width can generate good shearing effect on high-viscosity polymer resin in the process of generating polyvinyl acetate by solution polymerization, and the resin is not adhered to the stirring ribbon. If the width of the ribbon is too narrow (less than 8 mm), the structural strength of the ribbon can be affected, so that the ribbon is easy to break in the stirring process; if the width of the ribbon is too wide (more than 15 mm), the contact area between the ribbon and the material can be increased, so that the high-viscosity material is adhered to the ribbon, the mixing uniformity of the material is affected, and the subsequent cleaning burden can be increased.

Preferably, as a modification, the ratio of the width of the ribbon to the diameter of the stirring shaft is 1-1.8:1.

By adopting the scheme, the ratio of the width of the ribbon to the diameter of the stirring shaft is designed to be 1-1.8: 1, can satisfy spiral shell area and (mixing) shaft structural strength to when avoiding stirring in-process structure damage, control stirring structure's weight is in order to alleviate inverter motor's load, and control spiral shell area of contact with the material, in order to avoid high viscosity material adhesion on the spiral shell area.

Preferably, as an improvement, the stirring shaft is sleeved with the anchor ear, the connecting rod comprises a first rod section and a second rod section which are coaxially arranged, and one ends of the first rod section and the second rod section, which are far away from the ribbon, are fixedly connected to the anchor ear.

Adopt this scheme, design the connecting rod for including coaxial first pole section and the second pole section that sets up, the one end and the spiral shell area fixed connection of (mixing) shaft are kept away from to first pole section and second pole section, the one end and the staple bolt fixed connection that first pole section and second pole section are close to the (mixing) shaft, through staple bolt fixed connection on the (mixing) shaft, the connecting rod is compared with the connected mode of (mixing) shaft in this scheme with the connecting rod pegging graft the connected mode on the (mixing) shaft, can avoid punching on the (mixing) shaft, thereby guarantee the structural strength of (mixing) shaft, not only be favorable to using the (mixing) shaft to stir the material that has higher viscosity, in order to prepare the polyvinyl alcohol of high viscosity, be favorable to the life of extension (mixing) shaft moreover. In addition, adopt the staple bolt to dismantle the connection connecting rod on the (mixing) shaft, when the (mixing) shaft takes place to damage after long-time use, perhaps connecting rod and the arbitrary part of spiral shell area of fixed connection on it take place to damage, can change pertinently, and need not to change whole agitating unit, be favorable to controlling equipment cost.

Preferably, as a modification, the stirring shaft is made of 316L stainless steel material.

By adopting the scheme, the stirring shaft is supported by the 316L stainless steel material, and compared with the 304 stainless steel material, the 316L stainless steel material contains Mo, so that the stirring shaft made of the 316L stainless steel material has stronger corrosion resistance at high temperature, and the service life of the stirring shaft is guaranteed.

Drawings

Fig. 1 is a schematic overall structure of an embodiment of the present utility model.

Detailed Description

The following is a further detailed description of the embodiments:

reference numerals in the drawings of the specification include: stirring shaft 1, variable frequency motor 2, connecting rod 3, first pole section 31, second pole section 32, staple bolt 4, spiral shell area 5, separation blade 6.

Examples

This embodiment is basically as shown in fig. 1: the utility model provides a stirring device of high viscosity polyvinyl alcohol polymer, includes the (mixing) shaft 1 of vertical setting, and inverter motor 2 is installed on the top of (mixing) shaft 1, specifically, the output fixed connection of (mixing) shaft 1 and inverter motor 2. The stirring shaft 1 is provided with a plurality of connecting rods 3 from bottom to top, the axes of the connecting rods 3 are horizontal, and the connecting rods 3 are positioned in the same plane. Two spiral bands 5 are sleeved on the stirring shaft 1, the two spiral bands 5 are fixedly connected with two ends of the connecting rod 3 respectively, the connecting rod 3 is symmetrically arranged on the stirring shaft 1, namely, the two spiral bands 5 are symmetrically arranged on the stirring shaft 1. The outer diameter of the helical ribbon 5 is equal to the screw pitch, and the distance between two adjacent connecting rods 3 is also equal to the screw pitch. Two baffle plates 6 are symmetrically arranged on the stirring shaft 1, the baffle plates 6 are positioned above the spiral belt 5, the free ends of the baffle plates 6 incline downwards, in the embodiment, the baffle plates 6 and the connecting rod 3 are positioned in the same plane, and the baffle plates 6 are welded and fixed on the stirring shaft 1.

The diameter of the stirring shaft 1 is 8-10 mm, the width of the ribbon 5 is 8-15 mm, and the ratio of the width of the ribbon 5 to the diameter of the stirring shaft 1 is 1-1.8:1. Specifically, the diameter of the stirring shaft 1 can be 8mm, 9mm, 10mm and the like, the width of the ribbon 5 can be 8mm, 10mm, 12mm, 15mm and the like, in this embodiment, the width of the ribbon 5 is set to 10mm, the diameter of the stirring shaft 1 is set to 10mm, the width of the ribbon 5 and the diameter of the stirring shaft 1 are designed to be the same, and the ribbon is more convenient to process and manufacture while meeting the requirements of structural strength, structural weight and structural area.

The stirring shaft 1 is sleeved with the anchor ear 4, and specifically, the anchor ear 4 comprises two parts which are bilaterally symmetrical, and the left part and the right part of the anchor ear 4 are mutually connected and fixed on the stirring shaft 1 through bolts. The connecting rod 3 includes coaxial first pole section 31 and second pole section 32 that set up, and the one end that first pole section 31 and second pole section 32 are close to (mixing) shaft 1 welds respectively and fixes on the two parts of staple bolt 4, and the one end that first pole section 31 and second pole section 32 kept away from (mixing) shaft 1 is welded respectively with two spiral shell area 5 and is fixed.

The stirring shaft 1 is made of 316L stainless steel material, so that the stirring shaft 1 has good corrosion resistance in a high-temperature environment, and the high-viscosity polyvinyl alcohol is prepared after long-time use.

The specific implementation process is as follows:

in the process of preparing high-viscosity polyvinyl alcohol, acetylene is firstly used to react with acetic acid to generate vinyl acetate, and then solution polymerization is carried out to generate polyvinyl acetate. In the process of generating polyvinyl acetate through polymerization, the variable frequency motor 2 is started, the variable frequency motor 2 drives the stirring shaft 1 to rotate, the stirring shaft 1 drives the spiral belt 5 to rotate, and materials are stirred, so that the molecular weight distribution of the materials is more uniform, and the reaction is more thorough. Along with the progress of polymerization, the viscosity of material can become grow gradually, consequently can adjust inverter motor 2's rotational speed according to the viscosity of material, thereby adjust inverter motor 2's moment, specifically, along with the increase of material viscosity, with inverter motor 2's rotational speed regulation down, make inverter motor 2 transmit bigger moment to stir the material, in order to guarantee the homogeneity of material stirring.

After the preparation of the polyvinyl acetate is completed, the polyvinyl acetate and a sodium hydroxide methanol solution are mixed for alcoholysis to obtain the solid polyvinyl alcohol. In the process of generating polyvinyl alcohol by alcoholysis reaction, the material can change phase from liquid to solid, so that larger moment is required to stir the material to ensure the sufficient progress of alcoholysis reaction, thereby preparing the high-viscosity polyvinyl alcohol. Specifically, along with the progress of alcoholysis reaction, continue to turn down inverter motor 2's rotational speed for inverter motor 2 transmits bigger moment to stir the material, in order to guarantee the homogeneity of material stirring.

The stirring device is used for preparing the polyvinyl alcohol with high viscosity, the variable frequency motor 2 is arranged, so that a user can adjust the rotating speed and the transmitted torque of the variable frequency motor 2 according to the reaction proceeding degree, the stirring effect of the stirring device is adapted to the requirements of each reaction process, the smooth proceeding of each reaction is ensured, and the high-viscosity polyvinyl alcohol is efficiently prepared.

This agitating unit sets up ribbon 5 on (mixing) shaft 1, stirs the material through ribbon 5 in polyvinyl alcohol preparation process, compares in other types agitating unit such as crescent moon shape, paddle and anchor frame formula, and this agitating unit can adapt to the high viscosity of polyvinyl alcohol preparation in-process material better to carry out intensive mixing to the material, make the molecular weight distribution of material more even, with the polyvinyl alcohol of preparation high viscosity smoothly.

The foregoing is merely exemplary of the present utility model, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present utility model, and these should also be regarded as the protection scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the practical applicability of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (10)

1. The utility model provides a stirring device of high viscosity polyvinyl alcohol polymer, includes (mixing) shaft and drive arrangement that drive (mixing) shaft rotated, its characterized in that: the stirring shaft is provided with a plurality of connecting rods which are distributed along the axial direction of the stirring shaft; two spiral belts are sleeved on the stirring shaft and are fixedly connected with two ends of the connecting rod respectively; two baffle plates are symmetrically arranged on the stirring shaft, the baffle plates are positioned above the screw belt, and the free ends of the baffle plates incline downwards.

2. The stirring device for a high-viscosity polyvinyl alcohol polymer according to claim 1, wherein: the driving device is a variable frequency motor.

3. The stirring device for a high-viscosity polyvinyl alcohol polymer according to claim 2, wherein: the axis of connecting rod and the axis mutually perpendicular of (mixing) shaft, two spiral shell area symmetry set up on the (mixing) shaft.

4. A stirring device for high viscosity polyvinyl alcohol polymer as claimed in claim 3, wherein: the connecting rods are located in the same plane, and the distance between two adjacent connecting rods is equal to the pitch.

5. The stirring device for a high-viscosity polyvinyl alcohol polymer according to claim 4, wherein: the external diameter of the spiral belt is equal to the screw pitch.

6. The stirring device for high-viscosity polyvinyl alcohol polymer according to claim 5, wherein: the diameter of the stirring shaft is 8-10 mm.

7. The stirring device for high-viscosity polyvinyl alcohol polymer according to claim 6, wherein: the width of the ribbon is 0.8 mm-1.5 mm.

8. The stirring device for a high-viscosity polyvinyl alcohol polymer according to claim 7, wherein: the width of the ribbon is 1mm.

9. The stirring device for a high-viscosity polyvinyl alcohol polymer according to any one of claims 1 to 8, characterized in that: the stirring shaft is sleeved with the anchor ear, the connecting rod comprises a first rod section and a second rod section which are coaxially arranged, and one ends of the first rod section and the second rod section, which are far away from the ribbon, are fixedly connected to the anchor ear.

10. The stirring device for high-viscosity polyvinyl alcohol polymer according to claim 9, wherein: the stirring shaft is made of 316L stainless steel material.

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