CN112536933A - Polyethylene colloidal particle batch production method - Google Patents
Polyethylene colloidal particle batch production method Download PDFInfo
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- CN112536933A CN112536933A CN202011287274.5A CN202011287274A CN112536933A CN 112536933 A CN112536933 A CN 112536933A CN 202011287274 A CN202011287274 A CN 202011287274A CN 112536933 A CN112536933 A CN 112536933A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
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Abstract
The invention discloses a polyethylene colloidal particle batch production method, belonging to the field of polyethylene, wherein a radial premixing sheet is arranged in a reaction kettle, the separation and approach of two parts of the radial premixing sheet are controlled, in the process, a longitudinal shaking sheet can continuously shake longitudinally, so that raw materials continuously shake back and forth at the middle part and the edge of the longitudinal shaking sheet, the operations are repeated for multiple times, the raw materials are transversely and longitudinally mixed in a two-way mode, compared with the prior art, the condition that the mixing uniformity is poor due to the aggregation of the raw materials far away from the center is effectively avoided, the quality of colloidal particle finished products is further effectively ensured, in addition, the introduction and release operations of inert gases are matched in the clutch process of the radial premixing sheet, the air hardening pull tube continuously generates a cycle process of half hardening-softening-half hardening, and simultaneously is matched with an air hard disk, the shaking range of the raw materials is further improved, the mixing uniformity is improved, and the quality of the finished colloidal particle products is further ensured.
Description
Technical Field
The invention relates to the field of polyethylene, in particular to a batch production method of polyethylene colloidal particles.
Background
Polyethylene is mainly used for manufacturing films, containers, pipes, monofilaments, electric wires and cables, daily necessities and the like, and can be used as a high-frequency insulating material for televisions, radars and the like. Polyethylene is a thermoplastic resin obtained by polymerizing ethylene; the polyethylene is odorless, nontoxic, has a wax-like hand feeling, has excellent low-temperature resistance (the lowest use temperature can reach-100 to-70 ℃), has good chemical stability, can resist most of acid and alkali erosion (cannot resist acid with oxidation property), is insoluble in common solvents at normal temperature, has small water absorption, excellent electrical insulation, and has good electrical property and radiation resistance, and the low-pressure polyethylene has high melting point, rigidity, hardness and strength, small water absorption and good electrical property; the high-pressure polyethylene has better flexibility, elongation, impact strength and permeability; the ultra-high molecular weight polyethylene has high impact strength, fatigue resistance and wear resistance; the low-pressure polyethylene is suitable for manufacturing corrosion-resistant parts and insulating parts; the high-pressure polyethylene is suitable for making film, etc., and the ultrahigh-molecular weight polyethylene is suitable for making damping, wear-resisting and driving parts.
Polyethylene colloidal particle range of application is very extensive, the process of traditional polyethylene colloidal particle production technology is more, production facility is comparatively complicated, and in polyethylene preparation process, when the raw materials mixes, the mode of mechanical stirring is used usually, this kind of mode is under the effect of centrifugal force, stirring subassembly and gathering can be kept away from to the raw materials, the raw materials that distribute around the stirring subassembly simultaneously is less relatively, lead to the polyethylene raw materials to have the part uneven condition of being heated, the polymerization degree difference that leads to the polyethylene of producing is great, influence the off-the-shelf production quality of polyethylene colloidal particle.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a method for mass production of polyethylene colloidal particles, which controls the separation and approach of two parts of a radial premixing sheet in a reaction kettle, and in the process, the longitudinal shaking sheet can continuously shake longitudinally to enable raw materials to continuously shake back and forth at the middle part and the edge of the longitudinal shaking sheet, and the operations are repeated for multiple times to realize the bidirectional mixing of the raw materials in the transverse direction and the longitudinal direction, compared with the prior art, the method effectively avoids the condition of poor mixing uniformity caused by the aggregation of the raw materials far away from the center, further effectively ensures the quality of the finished colloidal particles, and in addition, the circulation process of semi-hardening-softening-semi-hardening is continuously generated in the clutch process of the radial premixing sheet by matching with the introduction and release operations of inert gas, and simultaneously, the gas hard discs are matched, the shaking range of the raw materials is further improved, the mixing uniformity is improved, and the quality of the finished colloidal particle products is further ensured.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A method for producing polyethylene colloidal particles in batches comprises the following steps:
s1, adding raw materials required by polyethylene production into the reaction kettle;
s2, pressurizing and heating the reaction kettle, then controlling the two parts of the radial premixing sheet in the reaction kettle to be separated and close to each other continuously, and uniformly mixing the raw materials in the reaction kettle;
s3, introducing inert gas into the reaction kettle from the bottom of the reaction kettle to semi-harden the middle part of the radial premixing sheet and increase the shaking amplitude of the radial premixing sheet to the raw materials during separation and approach;
s4, after mixing, introducing peroxide into the reaction kettle, and carrying out high-pressure polymerization;
and S5, cutting and granulating the polymerized polyethylene at high temperature.
Further, the raw material in the S1 comprises a catalyst and ethylene, and the temperature after temperature rise and pressure rise in the S2 is 130-170 ℃, and the pressure is 110-190 MPa.
Further, spray the talcum powder to the high temperature micelle that obtains after the cutting in the S4 when cutting the granulation, effectively reduce the viscidity on high temperature micelle surface through the talcum powder, improve the smoothness on its surface simultaneously for the micelle finished product that the high temperature micelle formed after the cooling is difficult for the adhesion each other is in the same place, and then effectively improves the off-the-shelf quality of micelle.
Further, inert gas lets in after radial premixing piece two parts separation, this moment let in gas, make the gas hard trombone slide be in the half-hardening state, when two parts of radial premixing piece are close to, the gas hard trombone slide can further drive the mutual mixture of raw materials, make the mixed effect better, play after radial premixing piece two parts are close to, be close to the back, two parts are nearest each other, the gas hard trombone slide is in crooked folded form this moment, release inert gas this moment, the gas hard trombone slide is resumeed the softening by the half-hardening, certain change takes place for the raw materials of this part can take place to become flexible, make the mixed effect better.
Further, inert gas is high thermal conductivity gas, prefers helium, and inert gas temperature is not less than 140 ℃ when letting in for inert gas self carries certain temperature, can be when the raw materials mixes, and the supplementary cauldron body is to the heating of raw materials, effectively avoids simultaneously letting in influencing the internal temperature of cauldron behind the gas, makes the internal temperature of cauldron maintain good stability, effectively guarantees that the raw materials is heated more evenly, effectively guarantees the off-the-shelf quality of micelle.
Further, the radial premixing sheet comprises a longitudinal shaking sheet fixedly connected to the inner wall of the kettle body of the reaction kettle, a hard lifting plate and an air hard pulling pipe fixedly connected between the longitudinal shaking sheet and the hard lifting plate, the lower end of the air hard pulling pipe fixedly penetrates through the longitudinal shaking sheet and is communicated with the space below the longitudinal shaking sheet, a pulling rope is fixedly connected between the upper end of the hard lifting plate and the top end in the kettle body through an automatic winder, when the radial premixing sheet is used, the pulling rope is wound through the automatic winder to control the hard lifting plate to ascend, so that the two parts of the radial premixing sheet are separated, when the air hard pulling pipe is completely stretched, the radial premixing sheet continues to be wound upwards, at the moment, the bottom of the longitudinal shaking sheet is subjected to an upwards pulling force and protrudes upwards, at the moment, a limiter in the automatic winder is controlled to be opened, so that the hard lifting plate rapidly sinks under the action of the elasticity of the air hard pulling pipe and the gravity of the hard, vertical shake piece resumes deformation and constantly takes place fore-and-aft shake this moment for the raw materials constantly shakes back and forth at the middle part and the edge of vertical shake piece, and the aforesaid operation of repetitious repetition realizes the raw materials in horizontal and fore-and-aft two-way mixture, compares in prior art, effectively avoids keeping away from the gathering and lead to the relatively poor condition of misce bene to take place because of the raw materials, and then effectively guarantees the off-the-shelf quality of micelle.
Further, vertical shake piece is made for elastic sealing material, makes it can take place deformation when receiving the power of dragging, when dragging the power disappearance, constantly takes place to shake under the effect of restoring the deformation power simultaneously, realizes the mixture of raw materials, the gas hard is drawn the pipe and is elasticity hollow structure, the stereoplasm rises the board and is porous structure, is convenient for the raw materials to pass stereoplasm and rises board whereabouts to vertical shake piece department.
Further, a plurality of spacing hard balls have been placed to cauldron internal bottom end, it is a plurality of spacing hard ball is located vertical shaking piece below, and the diameter of a plurality of spacing hard balls is different, a plurality of spacing hard balls do not contact with vertical shaking piece, thereby when making vertical shaking piece take place the spacing hard ball contact of vertical shaking, the height of contact point is inconsistent, make the raw materials shake effect to inside better, spacing hard ball makes it recover the deformation in-process at vertical shaking piece, can produce certain holding power to vertical shaking piece, thereby make the raw materials vibrations of stress point department float bigger, make mixed effect better, spacing hard ball can also effectively protect vertical shaking piece simultaneously, make it difficult quilt damage when losing the air hard pipe pulling force and recovering the deformation fast.
Further, a plurality of gas hard disks of gas hard trombone slide outer end fixedly connected with, gas hard disk communicates with each other with gas hard trombone slide inside, and gas hard disk is made for flexible inelastic sealing material, when aerifing, inert gas enters into gas hard trombone slide back in, can prop up gas hard disk, makes it possess certain hardness, presents the state of half hardening, thereby when the stereoplasm rises the board whereabouts and is close to vertical shaking piece, gas hard disk can stir the raw materials better, make the mixture of raw materials more even, thereby effectively guarantee that the polymerization effect is even relatively, improve the quality of finished product micelle.
Furthermore, the gas hard disk is of a lotus leaf-shaped structure with a downward opening, so that when the gas hard disk is in a semi-hardened state, the gas hard disk is larger in contact area with the raw materials, and the stirring effect on the raw materials is better.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme controls the separation and the approach of the two parts of the radial premixing sheet through the arrangement of the radial premixing sheet in the reaction kettle, in the process, the longitudinal shaking piece can continuously shake longitudinally, so that the raw materials continuously shake back and forth at the middle part and the edge of the longitudinal shaking piece, the operations are repeated for a plurality of times, the raw materials are mixed in both the transverse direction and the longitudinal direction, compared with the prior art, the condition that the mixing uniformity is poor due to the gathering of the raw materials far away from the center is effectively avoided, further effectively ensuring the quality of the finished product of the colloidal particles, in addition, the gas hard tube drawing continuously generates the cycle process of semi-hardening, softening and semi-hardening by matching with the charging and releasing operation of inert gas in the clutch process of the radial premixing plate, and meanwhile, the shaking range of the raw materials is further improved by matching with a pneumatic hard disk, the mixing uniformity is improved, and the quality of a colloidal particle finished product is further ensured.
(2) Talcum powder is sprayed to the high-temperature colloidal particles obtained after cutting while cutting and granulating in S4, the stickiness of the surface of the high-temperature colloidal particles is effectively reduced through the talcum powder, and the smoothness of the surface of the high-temperature colloidal particles is improved, so that colloidal particle finished products formed after cooling of the high-temperature colloidal particles are not easy to adhere to each other, and the quality of the colloidal particle finished products is effectively improved.
(3) Inert gas lets in after radial premixing piece two parts separation, let in gas this moment, make the gas hard trombone slide be in half hardening state, when two parts of radial premixing piece are close to, the gas hard trombone slide can further drive the mutual mixture of raw materials, make the mixed effect better, play after radial premixing piece two parts are close to, be close to the back, two parts are nearest each other, the gas hard trombone slide is in crooked folded form this moment, release inert gas this moment, the gas hard trombone slide is resumeed softly by half hardening, certain change takes place for the volume, make the raw materials of this part can take place to become flexible, make mixed effect better.
(4) Inert gas is high thermal conductivity gas, preferred helium, and inert gas temperature is not less than 140 ℃ when letting in for inert gas self carries certain temperature, can be when the raw materials mixes, supplementary cauldron body is to the heating of raw materials, effectively avoids letting in the internal temperature of cauldron after gaseous simultaneously, makes the internal temperature of cauldron maintain good stability, effectively guarantees that the raw materials is heated more evenly, effectively guarantees the off-the-shelf quality of micelle.
(5) The radial premixing sheet comprises a longitudinal shaking sheet fixedly connected to the inner wall of a kettle body of the reaction kettle, a hard lifting plate and an air-hard pulling pipe fixedly connected between the longitudinal shaking sheet and the hard lifting plate, the lower end part of the air-hard pulling pipe fixedly penetrates through the longitudinal shaking sheet and is communicated with the space below the longitudinal shaking sheet, the upper end of the hard lifting plate is fixedly connected with a pull rope through an automatic winder and the top end in the kettle body, when the radial premixing sheet is used, the pull rope is wound by the automatic winder to control the hard lifting plate to ascend, so that the two parts of the radial premixing sheet are separated, when the air-hard pulling pipe is completely stretched, the air-hard pulling pipe continues to roll upwards, at the moment, the bottom of the longitudinal shaking sheet is subjected to an upward pulling force and protrudes upwards, at the moment, a limiter in the automatic winder is controlled to open, so that the hard lifting plate rapidly sinks under the action of the elasticity of the air-hard pulling pipe and the gravity of the hard lifting plate, make the raw materials constantly shake at the middle part and the edge of vertical shaking piece back and forth, the above-mentioned operation of repetition many times realizes the raw materials in horizontal and fore-and-aft two-way mixing, compares in prior art, effectively avoids keeping away from the gathering and leading to the relatively poor condition of misce bene to take place because of the raw materials, and then effectively guarantees the off-the-shelf quality of micelle.
(6) Vertical shake the piece and make for elastic sealing material, make it can take place deformation when receiving the power of dragging, when dragging the power disappearance simultaneously, constantly take place to shake under the effect of the power of restoring deformation, realize the mixture of raw materials, the gas is hard to be drawn the pipe and is elasticity hollow structure, and stereoplasm liter board is porous structure, and the raw materials of being convenient for pass stereoplasm liter board whereabouts to vertical piece department of shaking.
(7) A plurality of spacing hard balls have been placed to the internal bottom of cauldron, a plurality of spacing hard balls are located vertical shaking piece below, and the diameter of a plurality of spacing hard balls is different, a plurality of spacing hard balls do not contact with vertical shaking piece, thereby when making vertical shaking piece take place the spacing hard ball contact of vertical shaking, the height of contact point is inconsistent, make the raw materials shake effect to inside better, spacing hard ball makes it at the vertical shaking piece and resumes deformation in-process, can produce certain holding power to vertical shaking piece, thereby make the raw materials vibrations of stress point department float bigger, make mixed effect better, spacing hard ball can also effectively protect vertical shaking piece simultaneously, make it difficult quilt damage when losing the gas hard trombone pipe and dragging the quick deformation of power.
(8) The gas hard trombone slide outer end fixedly connected with a plurality of gas hard wares, the gas hard disk communicates with each other with the gas hard trombone slide is inside, and the gas hard disk is made for flexible inelastic sealing material, when aerifing, inert gas enters into the gas hard trombone slide after in, can prop up the gas hard disk, make it possess certain hardness, present the state of half-hardening, thereby when the stereoplasm riser whereabouts is close to vertical shaking piece, the gas hard disk can stir the raw materials better, make the mixture of raw materials more even, thereby effectively guarantee that the polymerization effect is relatively even, improve the off-the-shelf quality of micelle.
(9) The gas hard disk is of a lotus leaf-shaped structure with a downward opening, so that when the gas hard disk is in a semi-hardened state, the gas hard disk is larger in contact area with raw materials, and the stirring effect on the raw materials is better.
Drawings
FIG. 1 is a principal flow diagram of the present invention;
FIG. 2 is a schematic structural view of a radial pre-mixing plate in a reaction kettle of the present invention in an original state without raw material addition;
FIG. 3 is a schematic view of the separated radial pre-mixing sheets in the reaction kettle according to the present invention;
FIG. 4 is a schematic structural view of the longitudinal shaking plate after the radial premixing plate in the reaction kettle approaches to the longitudinal shaking plate;
fig. 5 is a schematic structural view of the air-hardening tube according to the present invention.
The reference numbers in the figures illustrate:
the device comprises a kettle body 1, longitudinal shaking pieces 2, a gas hard pull pipe 3, a hard lifting plate 4, a pull rope 5, a limiting hard ball 6 and a gas hard disk 7.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1, a method for mass production of polyethylene rubber particles includes the following steps:
s1, adding raw materials required by polyethylene production into the reaction kettle;
s2, referring to the figure 3-4, pressurizing and heating the reaction kettle, then controlling the two parts of the radial premixing sheet in the reaction kettle to be separated and close to each other continuously, and uniformly mixing the raw materials in the reaction kettle;
s3, introducing inert gas into the reaction kettle from the bottom of the reaction kettle to semi-harden the middle part of the radial premixing sheet and increase the shaking amplitude of the radial premixing sheet to the raw materials during separation and approach;
s4, after mixing, introducing peroxide into the reaction kettle, and carrying out high-pressure polymerization;
and S5, cutting and granulating the polymerized polyethylene at high temperature.
The raw materials in the S1 comprise a catalyst and ethylene, the temperature after temperature rise and pressurization in the S2 is 170 ℃ and the pressure is 190MPa, the talcum powder is sprayed on the high-temperature colloidal particles obtained after cutting while cutting and granulating in the S4, the surface viscosity of the high-temperature colloidal particles is effectively reduced through the talcum powder, the surface smoothness of the high-temperature colloidal particles is improved, the colloidal particle finished products formed after cooling are not easy to adhere to each other, and the quality of the colloidal particle finished products is further effectively improved.
Referring to fig. 2, the radial premixing piece includes a longitudinal shaking piece 2 fixedly connected to the inner wall of the kettle 1 of the reaction kettle, a hard lifting plate 4 and an air hardening pulling tube 3 fixedly connected between the longitudinal shaking piece 2 and the hard lifting plate 4, the lower end of the air hardening pulling tube 3 fixedly penetrates through the longitudinal shaking piece 2 and is communicated with the space below the longitudinal shaking piece 2, the upper end of the hard lifting plate 4 is fixedly connected with a pulling rope 5 through an automatic winder and the top end in the kettle 1, referring to fig. 3-4, when in use, the pulling rope 5 is wound by the automatic winder to control the hard lifting plate 4 to ascend, so that two parts of the radial premixing piece are separated, when the air hardening pulling tube 3 is completely stretched, the upward rolling is continued, at this time, the bottom of the longitudinal shaking piece 2 is subjected to an upward pulling force and protrudes upward, at this time, the limiter in the automatic winder is controlled to open, so that under the elastic force of the air hardening pulling tube 3 and the gravity of the hard lifting plate 4, the hard lifting plate 4 sinks rapidly, at the moment, the longitudinal shaking piece 2 recovers deformation and generates longitudinal shaking constantly, so that the raw materials shake back and forth at the middle part and the edge of the longitudinal shaking piece 2 constantly, the operations are repeated for multiple times, the raw materials are mixed in both the transverse direction and the longitudinal direction, compared with the prior art, the situation that the mixing uniformity is poor due to the fact that the raw materials are gathered far away from the center is effectively avoided, and the quality of finished colloidal particles is further effectively guaranteed;
the inert gas is high-thermal-conductivity gas, preferably helium gas, the temperature of the inert gas is not lower than 140 ℃ during the introduction, so that the inert gas carries a certain temperature, the heating of the raw materials by the kettle body 1 can be assisted when the raw materials are mixed, the influence on the temperature in the kettle body 1 after the introduction of the gas is effectively avoided, the good stability of the temperature in the kettle body 1 is maintained, the raw materials are effectively heated more uniformly, the quality of a colloidal particle finished product is effectively ensured, the inert gas is introduced after the two parts of the radial premixing sheet are separated, the gas is introduced at the moment, so that the gas hard pull tube 3 is in a semi-hardening state, when the two parts of the radial premixing sheet are close, the gas hard pull tube 3 can further drive the raw materials to be mixed with each other, the mixing effect is better, the inert gas is discharged after the two parts of the radial premixing sheet are close, the two parts are nearest to each other, at the moment, the inert gas is released, the gas hard pulling pipe 3 is recovered and softened from semi-hardening, and the volume is changed to a certain extent, so that the raw materials of the part can be loosened, and the mixing effect is better;
the vertical shaking piece 2 is made of elastic sealing material, so that the vertical shaking piece can deform when being subjected to a dragging force, and can continuously shake under the action of a restoring deformation force when the dragging force disappears, so that raw materials are mixed, the air-hardening pulling tube 3 is of an elastic hollow structure, the hard lifting plate 4 is of a porous structure, so that the raw materials can conveniently pass through the hard lifting plate 4 and fall to the vertical shaking piece 2, a plurality of limiting hard balls 6 are placed at the inner bottom end of the kettle body 1, the limiting hard balls 6 are positioned below the vertical shaking piece 2, the diameters of the limiting hard balls 6 are different, the limiting hard balls 6 are not in contact with the vertical shaking piece 2, so that when the vertical shaking piece 2 is in contact with the limiting hard balls 6, the heights of contact points are different, so that the internal raw material shaking effect is better, the limiting hard balls 6 can generate a certain supporting force on the vertical shaking piece 2 in the restoring deformation process of the vertical shaking piece 2, thereby make the raw materials vibrations of atress point department more unsteady for it is better to mix the effect, and spacing hard ball 6 can also effectively protect vertical piece 2 that trembles simultaneously, makes it difficult by the damage when losing the gas hard and dragging pipe 3 and pull the quick recovery deformability of power.
Referring to fig. 5, the outer end of the air-hardening pulling tube 3 is fixedly connected with a plurality of air-hardening disks 7, the air-hardening disks 7 are communicated with the inside of the air-hardening pulling tube 3, and the air-hardening disks 7 are made of flexible inelastic sealing materials, so that when the air-hardening pulling tube 3 is inflated, inert gas enters the air-hardening pulling tube 3 and can support the air-hardening disks 7 to enable the air-hardening disks 7 to have certain hardness and to be in a semi-hardened state, and therefore when the hard lifting plate 4 falls to be close to the longitudinal shaking pieces 2, the air-hardening disks 7 can stir the raw materials better, the raw materials are mixed more uniformly, the polymerization effect is effectively guaranteed to be relatively uniform, the quality of the colloidal particle finished products is improved, and the air-hardening disks 7 are of a lotus leaf-shaped structure with the mouth part facing downwards, so that the contact area between the air-hardening disks 7 and the raw materials.
The separation and approach of the two parts of the radial premixing sheet are controlled by the arrangement of the radial premixing sheet in the reaction kettle, in the process, the longitudinal shaking piece 2 can continuously shake longitudinally, so that the raw materials continuously shake back and forth at the middle part and the edge of the longitudinal shaking piece 2, the operations are repeated for a plurality of times, the raw materials are mixed in both the transverse direction and the longitudinal direction, compared with the prior art, the condition that the mixing uniformity is poor due to the gathering of the raw materials far away from the center is effectively avoided, further effectively ensuring the quality of the finished product of the colloidal particles, in addition, the gas hard tube 3 continuously generates a cycle process of half hardening, softening and half hardening by matching with the charging and releasing operation of inert gas in the clutch process of the radial premixing plate, and meanwhile, the gas hard disk 7 is matched, so that the shaking range of the raw materials is further improved, the mixing uniformity is improved, and the quality of a colloidal particle finished product is further ensured.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (10)
1. A method for producing polyethylene colloidal particles in batches is characterized by comprising the following steps: the method comprises the following steps:
s1, adding raw materials required by polyethylene production into the reaction kettle;
s2, pressurizing and heating the reaction kettle, then controlling the two parts of the radial premixing sheet in the reaction kettle to be separated and close to each other continuously, and uniformly mixing the raw materials in the reaction kettle;
s3, introducing inert gas into the reaction kettle from the bottom of the reaction kettle to semi-harden the middle part of the radial premixing sheet and increase the shaking amplitude of the radial premixing sheet on the raw materials during separation and approach;
s4, after mixing, introducing peroxide into the reaction kettle, and carrying out high-pressure polymerization;
and S5, cutting and granulating the polymerized polyethylene at high temperature.
2. The method for mass production of polyethylene colloidal particles according to claim 1, wherein the method comprises the following steps: the raw materials in the S1 comprise a catalyst and ethylene, and the temperature after temperature rise and pressure rise in the S2 is 130-170 ℃, and the pressure is 110-190 MPa.
3. The method for mass production of polyethylene colloidal particles according to claim 1, wherein the method comprises the following steps: and in the step S4, talcum powder is sprayed on the high-temperature colloidal particles obtained after cutting while cutting and granulating.
4. The method for mass production of polyethylene colloidal particles according to claim 1, wherein the method comprises the following steps: and the inert gas is introduced after the two parts of the radial premixing sheet are separated, and is discharged after the two parts of the radial premixing sheet are close to each other.
5. The method for mass production of polyethylene colloidal particles according to claim 1, wherein the method comprises the following steps: the inert gas is high-thermal-conductivity gas, preferably helium, and the temperature of the inert gas is not lower than 140 ℃ when the inert gas is introduced.
6. The method for mass production of polyethylene colloidal particles according to claim 1, wherein the method comprises the following steps: radial premixing piece includes vertical shaking piece (2), stereoplasm liter board (4) and the air hard trombone slide (3) of fixed connection between vertical shaking piece (2) and stereoplasm liter board (4) of fixed connection at the cauldron body (1) inner wall of reation kettle, the end is fixed to run through vertical shaking piece (2) and communicates with each other with the space of vertical shaking piece (2) below under air hard trombone slide (3), stereoplasm rises between the top fixed connection stay cord (5) in board (4) upper end through autorotation ware and the cauldron body (1).
7. The method for mass production of polyethylene colloidal particles according to claim 6, wherein the method comprises the following steps: the longitudinal shaking pieces (2) are made of elastic sealing materials, the air-hard pull tube (3) is of an elastic hollow structure, and the hard lifting plate (4) is of a porous structure.
8. The method for mass production of polyethylene colloidal particles according to claim 6, wherein the method comprises the following steps: a plurality of spacing hard balls (6) have been placed to bottom in the cauldron body (1), and are a plurality of spacing hard ball (6) are located vertical shaking piece (2) below, and the diameter of a plurality of spacing hard balls (6) is different.
9. The method for mass production of polyethylene colloidal particles according to claim 6, wherein the method comprises the following steps: the outer end of the air hard pull pipe (3) is fixedly connected with a plurality of air hard disks (7), the air hard disks (7) are communicated with the interior of the air hard pull pipe (3), and the air hard disks (7) are made of flexible non-elastic sealing materials.
10. The method for mass production of polyethylene colloidal particles according to claim 9, wherein: the pneumatic hard disk (7) is of a lotus leaf-shaped structure with a downward opening.
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| CN202011287274.5A Withdrawn CN112536933A (en) | 2020-11-17 | 2020-11-17 | Polyethylene colloidal particle batch production method |
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2020
- 2020-11-17 CN CN202011287274.5A patent/CN112536933A/en not_active Withdrawn
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Application publication date: 20210323 |
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