CN117507236B - Production process and production system of methyl methacrylate polymer plate - Google Patents

Abstract

The invention discloses a production process of a methyl methacrylate polymer plate, which comprises the following steps: s1, adding methyl methacrylate, alkyl acrylate, long-chain alkyl acid salt, an initiator and a chain transfer agent into a polymerization kettle, and uniformly mixing; s2, controlling the temperature, pressure and stirring speed in the polymerization kettle to carry out bulk polymerization; s3, transferring the polymerization solution into a die through a quantitative feeding device, and drying through a drying and shaping device to obtain the methyl methacrylate polymer plate. Through the cooperation of ration feeding device and dry setting device, add the polymer solution in the charging jar, then extrude through the charging jar ration to add to dry mould through extruder and filling port, let in the conduction oil in the carousel, heat drying, and cooling shaping, finally obtain the polymer panel, can send each dry mould to the extruder position in proper order through the carousel rotation, thereby accomplish the injection, improve production efficiency.

Description

Production process and production system of methyl methacrylate polymer plate

Technical Field

The invention relates to the technical field of chemical industry, in particular to a production process and a production system of a methyl methacrylate polymer plate.

Background

Acrylic resins are a type of high molecular polymer formed from acrylic monomers by free radical polymerization. The acrylic resin with different performances can be prepared by selecting different acrylic acid (ester) monomers, adjusting the proportion of the monomers, adjusting the polymerization process and the like. Since the acrylic resin does not absorb in the visible light region, the acrylic resin has advantages of light resistance, outdoor aging resistance, weather resistance, and the like. Methyl methacrylate is taken as a main body, and the methyl methacrylate polymer plate can be prepared by a certain process, and has the characteristics of excellent weather resistance, corrosion resistance, color retention, water resistance, corrosion resistance, salt resistance, alkali resistance, ageing resistance, decoration and the like. Therefore, it is often used in the fields of construction, furniture, instruments, equipment, automobiles, ships, etc.

Methyl methacrylate polymer panel is in production process, need add the polymer solution to the mould in, then heat drying, after cooling, obtain the polymer panel, drying device among the prior art, unable efficient injection polymer solution, and the panel after the cooling shaping also can't be efficient take out and collect, and in the prior art mainly adds the polymer solution to the mould through artificial mode, add efficiency is lower, and because the manual work can't accomplish very accurate to the assurance of adding the volume, the condition of adding more and less appears easily, cause the thickness inequality of panel, product quality is relatively poor.

Accordingly, the inventor has the problem of providing a process and a system for producing methyl methacrylate polymer plates, which are expected to achieve the purpose of having more practical value, by keeping the experience of the design development and the actual production in the related industry for many years and researching and improving the existing structure and the defects.

Disclosure of Invention

In order to solve the problems mentioned in the background art, the invention provides a production process and a production system of a methyl methacrylate polymer plate.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

a production process of a methyl methacrylate polymer plate comprises the following steps:

S1, adding methyl methacrylate, alkyl acrylate, long-chain alkyl acid salt, an initiator and a chain transfer agent into a polymerization kettle, and uniformly mixing;

s2, controlling the temperature, pressure and stirring speed in the polymerization kettle to carry out bulk polymerization;

and S3, transferring the solution after the polymerization reaction is completed to a die through a quantitative feeding device, and drying through a drying and shaping device to obtain the methyl methacrylate polymer plate.

Preferably, the additive amount of each component is as follows according to the weight portion: 80-90 parts of methyl methacrylate, 10-20 parts of alkyl acrylate, 0.1-1 part of long-chain alkyl acid salt, 0.1-0.2 part of initiator and 0.1-0.2 part of chain transfer agent.

Preferably, in the step S2, the temperature is 125-135 ℃, the pressure is 1.0-1.2Mpa, the stirring speed is 50-60r/min, and the bulk polymerization time is 2-4h.

Preferably, in the step S1, the alkyl acrylate is cetyl methacrylate.

Preferably, in the step S1, the long-chain alkyl acid salt is sodium pentacosate.

The preparation method of the sodium pentacosate comprises the following steps: dispersing cyclopentadecanoic acid in water at 20-30deg.C, adding NaOH, stirring for 10 hr, adjusting the solution to neutrality, and filtering to remove insoluble substances to obtain sodium eicosapentaenoate.

Preferably, in the step S1, the initiator is selected from any one of dibenzoyl peroxide, azobisisobutyronitrile, tert-butyl peroxy-2-ethylhexanoate, tert-butyl peroxyisobutyrate, and tert-butyl peroxyacetate.

Preferably, in the step S1, the chain transfer agent is selected from any one of n-octanethiol and n-dodecyl mercaptan.

The invention also provides a production system of the methyl methacrylate polymer plate, which comprises a quantitative feeding device and a drying and shaping device, wherein the quantitative feeding device comprises a feeding tank, the top end of the feeding tank is provided with a guide pipe, and one end of the guide pipe, which is far away from the feeding tank, is fixed with an extruder;

The drying and shaping device comprises a rotary table, wherein a plurality of drying molds are arranged at the top end of the rotary table, an injection opening is formed in the top end of each drying mold, and the injection opening is correspondingly matched with the extruder.

Preferably, the quantitative feeding device further comprises a support, the feeding tank is mounted on the support through a lifting sliding rail, the inside of the feeding tank is provided with a one-way threaded rod and a first guide rod respectively, the inside of the feeding tank is further provided with a piston, the first guide rod penetrates through the piston through a guide hole, the one-way threaded rod penetrates through the piston through a threaded hole, the bottom end of the feeding tank extends to the outside of the feeding tank and is fixedly provided with a polygonal sleeve, and the top end of the feeding tank is further provided with a feeding port.

Preferably, the both sides of reinforced jar are equipped with first fixed strip and second fixed strip respectively, still are equipped with second guide bar and reciprocating screw on the support, reciprocating screw and second fixed strip screw thread fit, second guide bar and first fixed strip sliding fit, reciprocating screw's bottom mounting has first gear, still installs the ring gear through the annular guide rotation on the support, is fixed with first rotating electrical machines on the support, and the output shaft of first rotating electrical machines is fixed with the second gear, and the second gear meshes with the outer lane of ring gear, and first gear meshes with the inner circle of ring gear.

Preferably, the support is further rotatably provided with a polygonal plug pin, the top end of the polygonal plug pin extends into the polygonal sleeve, the bottom end of the polygonal plug pin is fixedly provided with a first synchronous wheel, the bottom end of the second guide rod is rotatably provided with a third gear, the bottom end of the third gear is fixedly provided with a second synchronous wheel, the outer sides of the first synchronous wheel and the second synchronous wheel are provided with a synchronous belt, the third gear is meshed with the inner ring of the toothed ring, the inner ring of the toothed ring is provided with incomplete teeth, and the toothed ring is not meshed with the first gear and the third gear simultaneously in the rotating process of the toothed ring.

Preferably, the drying and shaping device further comprises a supporting seat, the top end of the supporting seat is rotatably provided with a supporting column through a rotary joint, the top end of the supporting column is fixed with the rotary table, the top end of the supporting seat is fixedly provided with a second rotary motor, an output shaft of the second rotary motor is fixedly provided with a fourth gear, a fifth gear is fixed outside the supporting column, and the fourth gear is meshed with the fifth gear.

Preferably, the rotary joint is provided with a heat conducting oil inlet pipe and a heat conducting oil outlet pipe respectively, a channel for heat conducting oil to flow is arranged inside the support column, an annular heat conducting oil flow channel is arranged inside the rotary table, and the annular heat conducting oil flow channel extends in a serpentine shape at a corresponding position of the drying mould.

Preferably, the top of carousel is fixed with first push rod motor, and the output group of first push rod motor is fixed with drying die, and drying die's bottom and drying die keep away from one side of first push rod motor all are equipped with uncovered, and the bottom mounting of carousel has the second push rod motor, and the output shaft of second push rod motor is fixed with the baffle, baffle and drying die sliding contact.

Preferably, the top of drying die is equipped with a plurality of shutoff boards, and the top of drying die corresponds the position with the shutoff board and still is equipped with first hydraulic telescoping rod and second hydraulic telescoping rod, and the hydraulic oil of first hydraulic telescoping rod and second hydraulic telescoping rod communicates each other, and the flexible end and the shutoff board of first hydraulic telescoping rod are fixed, and the flexible end of second hydraulic telescoping rod is fixed with the clamp plate, and the bottom of clamp plate is equipped with the elastic expansion link that resets

Preferably, the extruder is provided with an electric valve, the bottom end of the electric valve is provided with a discharge pipe, the outer side of the discharge pipe is fixedly provided with a compression ring, the compression ring is correspondingly matched with the compression plate, and the discharge pipe is correspondingly matched with the injection port.

Compared with the prior art, the invention has the beneficial effects that:

1. Through the cooperation of the quantitative feeding device and the drying and shaping device, adding the polymer solution into a feeding tank, quantitatively extruding through the feeding tank, adding the polymer solution into a drying mould through an extruder and an injection port, introducing heat conduction oil into a rotary table, heating and drying, cooling and shaping to finally obtain a polymer plate, and sequentially conveying each drying mould to the position of the extruder through the rotation of the rotary table, so that the injection is completed, and the production efficiency is improved;

2. Through the design of the quantitative feeding device, the first rotary motor can drive the second gear to rotate, and the reciprocating screw rod can be driven to rotate through the meshing transmission among the second gear, the toothed ring and the first gear, so that the feeding tank can be driven to move up and down, and when the feeding tank moves up and down, the extruder can be driven to move up and down, so that the extruder can be automatically separated from and combined with the injection port, and the rotation of the turntable can not be influenced;

3. When the toothed ring continuously rotates, the first gear and the third gear can be alternately driven to rotate through meshing, when the first gear is driven to rotate, the reciprocating screw rod can be driven to rotate, the charging tank can be driven to move up and down, the charging tank can be driven to move right and back and forth when being meshed with the first gear once, the charging tank can be driven to move up, the extruder is driven to separate from the injection port, the rotary table can rotate to replace the drying mold during separation, after replacement, the charging tank moves down, the extruder is combined with a new injection port, then the third gear is driven to rotate, and then the polygonal bolt, the polygonal sleeve and the unidirectional threaded rod are driven to rotate through the transmission of the first synchronous wheel, the second synchronous wheel and the synchronous belt, so that the piston can be driven to move up for a small distance, the aim of quantitatively extruding polymer solution is fulfilled, the degree of automation is higher, and the use is convenient;

4. The discharging pipe can be inserted into the compression ring just when the extruder moves downwards, the compression ring can touch the compression plate in advance in the process of the downward movement of the extruder, and accordingly the second hydraulic telescopic rod is extruded, the telescopic end of the first hydraulic telescopic rod is driven to move through hydraulic transmission power, the plugging plates are driven to be separated away from each other, the injection opening is exposed, the discharging pipe can be inserted, after the injection is completed, the discharging pipe is extracted, the plugging plates can be driven to move for resetting due to the action of the elastic telescopic rod which resets, the injection opening is automatically plugged, dust can be prevented from falling into the injection opening in the drying and cooling process, and the quality of the plate is affected.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a perspective view of a first view of the production system of the present invention;

FIG. 3 is an enlarged detail view of a first view of the dosing device of the present invention;

FIG. 4 is a schematic view of the internal structure of the feed tank of the present invention;

FIG. 5 is a schematic view of the ring gear installation of the present invention;

FIG. 6 is an enlarged detail view of a second view of the dosing device of the present invention;

FIG. 7 is an enlarged detail view of a third view of the dosing device of the present invention;

FIG. 8 is a top view of the turntable of the present invention;

FIG. 9 is an enlarged detail view of the position A of FIG. 2;

FIG. 10 is an enlarged detail view of the position B of FIG. 8;

FIG. 11 is a second perspective view of the production system of the present invention;

FIG. 12 is an enlarged detail view of a first view of the drying mold of the present invention;

FIG. 13 is an enlarged detail view of a second view of the drying mold of the present invention;

Fig. 14 is a schematic distribution diagram of an annular heat conducting oil flow channel according to the present invention.

In the figure: the device comprises a bracket, a second synchronous wheel, a 102 lifting slide rail, a second 103 guide rod, a 104 reciprocating screw rod, a first 105 gear, a 106 annular guide rail, a 107 toothed ring, a 108 third gear, a2 feeding tank, a 201 guide pipe, a 202 feeding port, a 203 unidirectional threaded rod, a 204 first guide rod, a 205 polygonal sleeve, a 206 first fixing strip, a 207 second fixing strip, a 208 polygonal plug pin, a 209 first synchronous wheel, a 210 synchronous belt, a3 extruder, a 301 electric valve, a 302 discharging pipe, a 303 compression ring, a 4 first rotating motor, a 401 second gear, a 5 supporting seat, a 501 rotating joint, a 502 supporting column, a 503 fifth gear, a 504 second rotating motor, a 505 fourth gear, a 506 heat conducting oil inlet pipe, a 507 heat conducting oil discharging pipe, a 6 turntable, a 601 annular heat conducting oil runner, a 602 first push rod motor, a 7 drying mould, a 701, a 702 plugging plate, a 703 first hydraulic telescopic rod, a 704 second hydraulic telescopic rod, a 705 pressure plate, a 706 resetting elastic telescopic rod and a 8 conveying belt.

Detailed Description

Unless otherwise indicated, parts in the present invention are parts by mass;

Unless otherwise indicated, the raw materials and reagents used in the present invention are commercially available or may be prepared by direct customization in a chemical reagent customization factory.

Example 1

Referring to fig. 1, a process for producing a methyl methacrylate polymer sheet comprises the steps of:

S1, adding 85 parts of methyl methacrylate, 15 parts of cetyl methacrylate, 0.5 part of sodium eicosapentaenoic acid carboxylate, 0.15 part of azodiisobutyronitrile and 0.15 part of n-octyl mercaptan into a polymerization kettle, and uniformly mixing;

s2, controlling the temperature in the polymerization kettle to be 130 ℃, the pressure to be 1.1Mpa, the stirring speed to be 55r/min, and carrying out bulk polymerization for 3 hours;

And S3, transferring the solution after the polymerization reaction is completed to a die through a quantitative feeding device, and drying through a drying and shaping device to obtain the methyl methacrylate polymer plate.

Example 2

This example is different from example 1 in that "80 parts of methyl methacrylate, 20 parts of cetyl methacrylate" and the other are exactly the same as example 1.

Example 3

This example is different from example 1 in that "90 parts of methyl methacrylate, 10 parts of cetyl methacrylate" are used, and the other is exactly the same as example 1.

Example 4

Referring to fig. 1-14, a production system of methyl methacrylate polymer plates comprises a quantitative feeding device and a drying and shaping device, wherein the quantitative feeding device comprises a feeding tank 2, a guide pipe 201 is arranged at the top end of the feeding tank 2, and an extruder 3 is fixed at one end of the guide pipe 201 far away from the feeding tank 2;

the drying and shaping device comprises a rotary table 6, wherein the top end of the rotary table 6 is provided with a plurality of drying dies 7, the top end of each drying die 7 is provided with an injection opening 701, and the injection openings 701 are correspondingly matched with the extruder 3;

The polymer solution is added into the charging tank 2, then quantitatively extruded through the charging tank 2, and added into the drying mold 7 through the extruder 3 and the injection port 701, heat conduction oil is introduced into the rotary table 6, the heating and the drying are carried out, and the polymer plate is finally obtained, and each drying mold 7 can be sequentially sent to the position of the extruder 3 through the rotation of the rotary table 6, so that the injection is completed, and the production efficiency is improved.

Example 5

Referring to fig. 1 to 14, the difference between the present embodiment and embodiment 2 is that the quantitative charging device further includes a bracket 1, a charging tank 2 is mounted on the bracket 1 through a lifting sliding rail 102, a unidirectional threaded rod 203 and a first guide rod 204 are respectively mounted inside the charging tank 2, a piston 211 is further disposed inside the charging tank 2, the first guide rod 204 penetrates through the piston 211 through a guide hole, the unidirectional threaded rod 203 penetrates through the piston 211 through a threaded hole, the bottom end of the charging tank 2 extends to the outside of the charging tank 2 and is fixed with a polygonal sleeve 205, and a charging port 202 is further disposed at the top end of the charging tank 2;

when the polygonal sleeve 205 rotates, the unidirectional threaded rod 203 can be driven to rotate, so that the piston 211 can be driven to move upwards, and the polymer solution in the charging tank 2 can be extruded from the extruder 3.

Example 6

Referring to fig. 1-14, the difference between this embodiment and embodiment 3 is that, two sides of the charging bucket 2 are respectively provided with a first fixing strip 206 and a second fixing strip 207, the bracket 1 is also provided with a second guide rod 103 and a reciprocating screw rod 104, the reciprocating screw rod 104 is in threaded fit with the second fixing strip 207, the second guide rod 103 is in sliding fit with the first fixing strip 206, the bottom end of the reciprocating screw rod 104 is fixed with a first gear 105, the bracket 1 is also rotatably provided with a toothed ring 107 through a circular guide rail 106, the bracket 1 is fixed with a first rotary motor 4, the output shaft of the first rotary motor 4 is fixed with a second gear 401, the second gear 401 is meshed with the outer ring of the toothed ring 107, and the first gear 105 is meshed with the inner ring of the toothed ring 107;

Can drive the second gear 401 through first rotating electrical machines 4 and rotate, through the meshing transmission between two gears 40, ring gear 107 and the first gear 105, can drive reciprocal lead screw 104 and rotate to can drive charging jar 2 lift and remove, when charging jar 2 lift and remove, can drive extruder 3 lift and remove, make extruder 3 can be automatic with filling port 701 separation and combination, thereby can not influence the rotation of carousel 6.

Example 7

Referring to fig. 1 to 14, the difference between this embodiment and embodiment 3 is that a polygonal latch 208 is rotatably mounted on the bracket 1, the top end of the polygonal latch 208 extends into the polygonal sleeve 205, the polygonal latch 208 can rotate to drive the polygonal sleeve 205 to rotate, so as to drive the piston 211 to move upwards, thereby extruding the polymer solution, and the lifting movement of the charging tank 2 is not affected, a first synchronizing wheel 209 is fixed at the bottom end of the polygonal latch 208, a third gear 108 is rotatably mounted at the bottom end of the second guide rod 103, a second synchronizing wheel 101 is fixed at the bottom end of the third gear 108, a timing belt 210 is mounted outside the first synchronizing wheel 209 and the second synchronizing wheel 101, the third gear 108 is meshed with the inner ring of the toothed ring 107, the inner ring of the toothed ring 107 is not completely toothed, and the toothed ring 107 is meshed with the first gear 105 and the third gear 108 at different times during rotation, when the toothed ring 107 continuously rotates, the first gear 105 and the third gear 108 can be driven to rotate alternately through meshing, when the first gear 105 is driven to rotate, the reciprocating screw rod 104 can be driven to rotate, the charging tank 2 can be driven to move up and down, and the charging tank 2 can be driven to move right once in meshing with the first gear 105, so that the charging tank 2 can be driven to move up and down, the extruder 3 is driven to be separated from the injection port 701, the rotary table 6 can rotate to replace the drying mold 7 during separation, after the replacement is completed, the charging tank 2 moves down, the extruder 3 is combined with the new injection port 701, then the third gear 108 is driven to rotate, the polygonal plug pin 208, the polygonal sleeve 205 and the unidirectional screw rod 203 are driven to move up for a small distance through transmission of the first synchronous wheel 209, the second synchronous wheel 101 and the synchronous belt 210, the purpose of quantitatively extruding the polymer solution is achieved, the degree of automation is higher, and the use is convenient.

The drying and shaping device further comprises a supporting seat 5, a supporting column 502 is rotatably arranged at the top end of the supporting seat 5 through a rotary joint 501, the top end of the supporting column 502 is fixed with a rotary table 6, a second rotary motor 504 is fixedly arranged at the top end of the supporting seat 5, a fourth gear 505 is fixed on an output shaft of the second rotary motor 504, a fifth gear 503 is fixed on the outer portion of the supporting column 502, and the fourth gear 505 is meshed with the fifth gear 503;

In order to rotate the turntable 6, only the second rotating motor 504 is required to be started, the second rotating motor 504 drives the fourth gear 505 to rotate, the turntable 6 can be driven by meshing the fourth gear 505 with the fifth gear 503, and the turntable 6 rotates by a fixed angle each time, and the angle is exactly the connecting line included angle between the positions of the adjacent drying molds 7 and the center point of the turntable 6.

Example 8

Referring to fig. 1-14, the difference between the present embodiment and embodiment 1 is that the rotary joint 501 is respectively provided with a heat transfer oil inlet pipe 506 and a heat transfer oil outlet pipe 507, the inside of the support column 502 is provided with a channel for heat transfer oil to flow, the inside of the turntable 6 is provided with an annular heat transfer oil runner 601, the annular heat transfer oil runner 601 extends in a serpentine shape at a corresponding position of the drying mold 7, the turntable 6 can be heated by introducing heat transfer oil, and the polymer solution inside the drying mold 7 is heated by contacting heat transfer, so as to achieve the effect of drying the solution.

Wherein, the top of carousel 6 is fixed with first push rod motor 602, the output group of first push rod motor 602 is fixed with drying die 7, the bottom of drying die 7 and one side that drying die 7 kept away from first push rod motor 602 all are equipped with uncovered, the bottom mounting of carousel 6 has second push rod motor 8, the output shaft of second push rod motor 8 is fixed with baffle 801, baffle 801 and drying die 7 sliding contact, after the dry cooling shaping, drive baffle 801 downwardly moving through second push rod motor 8 earlier, the drying die 7 is promoted to break away from the top of carousel 6 to rethread first push rod motor 602, the polymer panel of drying shaping can break away from the bottom of drying die 7 this moment automatically, and the top of conveyer belt 8 is sent away to the whereabouts, the panel is collected more efficiently.

Example 9

Referring to fig. 1-14, the difference between this embodiment and embodiment 6 is that the top end of the drying mold 7 is provided with a plurality of plugging plates 702, the position of the top end of the drying mold 7 corresponding to the plugging plates 702 is further provided with a first hydraulic telescopic rod 703 and a second hydraulic telescopic rod 704, hydraulic oil of the first hydraulic telescopic rod 703 and hydraulic oil of the second hydraulic telescopic rod 704 are mutually communicated, the telescopic end of the first hydraulic telescopic rod 703 is fixed with the plugging plates 702, the telescopic end of the second hydraulic telescopic rod 704 is fixed with a pressing plate 705, and the bottom end of the pressing plate 705 is provided with a reset elastic telescopic rod 706.

Wherein, the extruder 3 is provided with an electric valve 301, the bottom end of the electric valve 301 is provided with a discharge pipe 302, the outer side of the discharge pipe 302 is fixed with a compression ring 303, the compression ring 303 is correspondingly matched with the compression plate 705, and the discharge pipe 302 is correspondingly matched with the injection port 701;

The discharging pipe 302 can be inserted into the compression ring 303 just when the extruder 3 moves downwards, the compression ring 303 can touch the compression plate 705 in advance in the process of the downward movement of the extruder 3, and therefore the second hydraulic telescopic rod 704 is extruded, the telescopic end of the first hydraulic telescopic rod 703 is driven to move through hydraulic transmission power, the blocking plate 702 is driven to be separated away from each other, the injection port 701 is exposed, the discharging pipe 302 is ensured to be inserted, after the injection is completed, the discharging pipe 302 is extracted, the blocking plate 702 is driven to move and reset due to the action of the reset elastic telescopic rod 706, the injection port 701 is blocked automatically, dust falling into the injection port 701 in the drying and cooling process can be prevented, and the quality of the plate is influenced.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

The control mode of the invention is automatically controlled by the controller, the control circuit of the controller can be realized by simple programming of a person skilled in the art, the supply of power also belongs to common knowledge in the art, and the invention is mainly used for protecting a mechanical device, so the invention does not explain the control mode and circuit connection in detail.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (8)

1. A system for producing methyl methacrylate polymer plates, which is characterized in that: the quantitative feeding device comprises a feeding tank (2), a guide pipe (201) is arranged at the top end of the feeding tank (2), and an extruder (3) is fixed at one end, far away from the feeding tank (2), of the guide pipe (201);

The drying and shaping device comprises a rotary table (6), wherein a plurality of drying molds (7) are arranged at the top end of the rotary table (6), an injection opening (701) is formed in the top end of each drying mold (7), and the injection opening (701) is correspondingly matched with the extruder (3);

The quantitative feeding device further comprises a support (1), the feeding tank (2) is arranged on the support (1) through a lifting sliding rail (102), a one-way threaded rod (203) and a first guide rod (204) are respectively arranged in the feeding tank (2), a piston (211) is further arranged in the feeding tank (2), the first guide rod (204) penetrates through the piston (211) through a guide hole, the one-way threaded rod (203) penetrates through the piston (211) through a threaded hole, the bottom end of the feeding tank (2) extends to the outer part of the feeding tank (2) and is fixedly provided with a polygonal sleeve (205), and a feeding port (202) is further formed in the top end of the feeding tank (2);

the feeding tank is characterized in that a first fixing strip (206) and a second fixing strip (207) are respectively arranged on two sides of the feeding tank (2), a second guide rod (103) and a reciprocating screw rod (104) are further arranged on the support (1), the reciprocating screw rod (104) is in threaded fit with the second fixing strip (207), the second guide rod (103) is in sliding fit with the first fixing strip (206), a first gear (105) is fixed at the bottom end of the reciprocating screw rod (104), a toothed ring (107) is further rotatably arranged on the support (1) through an annular guide rail (106), a first rotary motor (4) is fixed on the support (1), a second gear (401) is fixed on an output shaft of the first rotary motor (4), the second gear (401) is meshed with the outer ring of the toothed ring (107), and the first gear (105) is meshed with the inner ring of the toothed ring (107);

The novel multi-purpose synchronous belt is characterized in that a polygonal plug pin (208) is further rotatably installed on the support (1), the top end of the polygonal plug pin (208) extends into the polygonal sleeve (205), the polygonal plug pin (208) can drive the polygonal sleeve (205) to rotate when rotating, so that a piston (211) can be driven to move upwards, polymer solution is extruded, the transmission is not influenced when a charging tank (2) moves up and down, a first synchronous wheel (209) is fixed at the bottom end of the polygonal plug pin (208), a third gear (108) is rotatably installed at the bottom end of a second guide rod (103), a second synchronous wheel (101) is fixed at the bottom end of the third gear (108), a synchronous belt (210) is installed outside the first synchronous wheel (209) and the second synchronous wheel (101), the third gear (108) is meshed with the inner ring of the toothed ring (107), the inner ring of the toothed ring (107) is incompletely toothed, the toothed ring (107) is meshed with the first gear (105) and the third gear (108) when the toothed ring (107) rotates continuously, and the first gear (105) and the third gear (108) can be alternately driven to rotate.

2. A process for producing a methyl methacrylate polymer sheet, using a system for producing a methyl methacrylate polymer sheet as defined in claim 1, comprising the steps of:

S1, adding methyl methacrylate, alkyl acrylate, long-chain alkyl acid salt, an initiator and a chain transfer agent into a polymerization kettle, and uniformly mixing;

s2, controlling the temperature, pressure and stirring speed in the polymerization kettle to carry out bulk polymerization;

and S3, transferring the solution after the polymerization reaction is completed to a die through a quantitative feeding device, and drying through a drying and shaping device to obtain the methyl methacrylate polymer plate.

3. The process for producing a methyl methacrylate polymer sheet according to claim 2, wherein the addition amounts of the components in parts by weight are: 80-90 parts of methyl methacrylate, 10-20 parts of alkyl acrylate, 0.1-1 part of long-chain alkyl acid salt, 0.1-0.2 part of initiator and 0.1-0.2 part of chain transfer agent.

4. The process according to claim 2, wherein in step S2, the temperature is 125-135 ℃, the pressure is 1.0-1.2Mpa, the stirring speed is 50-60r/min, and the bulk polymerization time is 2-4h.

5. The process for producing a methyl methacrylate polymer sheet according to claim 2, wherein in the step S1, the alkyl acrylate is cetyl methacrylate.

6. The process for producing a methyl methacrylate polymer sheet according to claim 2, wherein in the step S1, the long-chain alkyl acid salt is sodium pentacosate.

7. The process for producing a methyl methacrylate polymer sheet according to claim 2, wherein in the step S1, the initiator is selected from any one of dibenzoyl peroxide, azobisisobutyronitrile, t-butyl peroxy-2-ethylhexanoate, t-butyl peroxyisobutyrate, and t-butyl peroxyacetate.

8. The process for producing a methyl methacrylate polymer sheet according to claim 2, wherein the chain transfer agent in the step S1 is selected from any one of n-octanethiol and n-dodecyl mercaptan.