A method and device for preparing slump-retention polycarboxylate water reducer

Abstract

The present invention discloses a method and device for preparing a collapse-preserving polycarboxylate water-reducing agent, which relates to the technical field of concrete water-reducing agent preparation, and comprises a reactor, wherein a driving air intake mechanism is provided inside the reactor and at the bottom of the reactor, a trigger-type blocking mechanism is provided inside the driving air intake mechanism, a dispersing and mixing mechanism is provided at the bottom of the reactor inner cavity, and a lifting and lowering regulating mechanism is provided at the top of the reactor inner cavity, and the dispersing and mixing mechanism and the lifting and lowering regulating mechanism are both connected to the driving air intake mechanism in a transmission manner. The present invention has a high degree of automation and can make dry hydrogen chloride gas evenly distributed in a mixed solution formed by a prepolymer and ethanol for reaction, and can crush larger bubbles during the reaction process, so that large bubbles become a large number of tiny bubbles, thereby effectively improving the reaction efficiency, and is more suitable for the industrial production of collapse-preserving polycarboxylate water-reducing agents.

Description

Technical Field

[0001] The present invention relates to the technical field of preparation of concrete water reducers, and particularly to a method and device for preparing slump-retention polycarboxylate water reducers. Background Art

[0002] Polycarboxylate water reducers, as a new type of high-performance water reducer introduced after aliphatic, naphthalene-based, and amino sulfonate-based water reducers, have been increasingly widely used in a series of concrete projects such as high-speed railways, bridges, tunnels, and dams due to their excellent properties such as low dosage, high water reduction rate, strong adjustable molecular structure, and environmental friendliness.

[0003] The invention patent with the authorization announcement number CN 109535344 B discloses a preparation method of a slump-retention polycarboxylate water reducer, which includes the following steps: S1. Preparation of prepolymer: Copolymerize raw materials unsaturated nitrile and unsaturated polyether under the action of an initiator, a reducing agent, and a chain transfer agent to form a prepolymer containing a nitrile group. This invention directly reacts to generate a carboxylic acid ester group without using ester and carboxylic acid monomers as raw materials. The introduction of the carboxylic acid ester makes the dispersion performance of the cement paste after adsorbing the water reducer better, enhances the wrapping property of the aggregate, and has high slump-retention performance at a certain water reduction rate.

[0004] However, after the above preparation method was actually applied by those skilled in the art, it was found that there were still some disadvantages. More obvious is that after drying hydrogen chloride gas, the reaction area between the mixed solution formed by the prepolymer and ethanol and the dried hydrogen chloride gas is only the liquid surface area of the mixed solution, and the reaction efficiency is not ideal.

[0005] In view of the above situation, those skilled in the art thought of directly injecting dried hydrogen chloride gas into the mixed solution. The dried hydrogen chloride gas will form floating bubbles after being injected into the mixed solution, and then continuously react with the solution. However, since the dried hydrogen chloride gas cannot be evenly distributed in the mixed solution after being injected, the reaction efficiency still needs to be improved.

[0006] Therefore, it is necessary to invent a method and device for preparing a slump-retention polycarboxylate water reducer to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a method and device for preparing a slump-retention polycarboxylate water reducer to solve the problems raised in the above background art.

[0008] To achieve the above object, the present invention provides the following technical solution: A device for preparing a slump-retention type polycarboxylate water reducer, including a reaction kettle, wherein a driving air inlet mechanism is jointly arranged inside the reaction kettle and at the bottom of the reaction kettle, a trigger type blocking mechanism is arranged inside the driving air inlet mechanism, a dispersion and mixing mechanism is arranged at the bottom of the inner cavity of the reaction kettle, and a lifting type adjusting mechanism is arranged at the top of the inner cavity of the reaction kettle. Both the dispersion and mixing mechanism and the lifting type adjusting mechanism are in transmission connection with the driving air inlet mechanism;

[0009] The driving air inlet mechanism includes a driving screw, a driving motor, a driving gear, a dry hydrogen chloride gas input pipe, and a first gas channel;

[0010] The driving screw penetrates through the bottom of the reaction kettle and is rotationally connected to the reaction kettle through a bearing. The driving motor is fixedly arranged on the right side of the bottom of the driving screw. There are two driving gears. The driving screw is in transmission connection with the driving motor through the two driving gears. The dry hydrogen chloride gas input pipe is rotationally connected to the bottom end of the driving screw through a rotary joint. There are multiple first gas channels, and the multiple first gas channels are evenly opened at the outer bottom of the driving screw;

[0011] The trigger type blocking mechanism includes a T-shaped sliding rod, a limiting ring, a fixing ring, a first spring, a first blocking block, a second blocking block, a second gas channel, and a blocking rod;

[0012] The T-shaped sliding rod is slidably nested inside the driving screw. The limiting ring, the fixing ring, the first spring, and the first blocking block are sleeved on the outer side of the driving screw in sequence from top to bottom. The limiting ring is fixedly connected to the inner wall of the driving screw. The fixing ring is fixedly sleeved on the outer side of the T-shaped sliding rod. The first blocking block is slidably sleeved on the outer side of the T-shaped sliding rod. One end of the first spring is fixedly connected to the fixing ring and the other end is fixedly connected to the first blocking block. The second blocking block is fixedly arranged at the bottom end of the T-shaped sliding rod. There are multiple second gas channels, and the multiple second gas channels are evenly opened at the bottom of the second blocking block and extend to the top of the second blocking block. Both the first blocking block and the second blocking block are slidably arranged inside the driving screw. There are multiple blocking rods, and the multiple blocking rods are evenly and fixedly arranged at the bottom of the first blocking block.

[0013] Preferably, the dispersion and mixing mechanism includes a dispersion disc, multiple hollow plates, and multiple stirring components. Each stirring component includes a dispersion screw, multiple valves, multiple movable components, and multiple second springs. Any one group of the movable components includes two arc-shaped plates, four connecting rods, and two crushing rods.

[0014] Preferably, the dispersion disk is fixedly sleeved on the outer bottom of the driving screw and communicated with the driving screw through the first gas channel. A plurality of the hollow plates are uniformly and fixedly arranged on the outer side of the dispersion disk and are all communicated with the dispersion disk. A plurality of the stirring components are respectively rotationally nested on the tops of the plurality of hollow plates. The dispersion screw is rotatably connected to the adjacent hollow plate through a bearing and is communicated therewith. A plurality of the valves are uniformly and fixedly nested on the front and back of the dispersion screw. A plurality of the second springs are all sleeved on the outer side of the dispersion screw and are located between two adjacent movable components.

[0015] Preferably, two of the arc-shaped plates are respectively slidably nested on both sides of the dispersion screw. Four of the connecting rods are fixedly arranged between the two arc-shaped plates. Two of the crushing rods are respectively fixedly arranged on the outer sides of the two arc-shaped plates. Sliders are arranged on the inner sides of the arc-shaped plates. Chutes are arranged on the sides of the dispersion screw. The sliders are slidably arranged inside the chutes.

[0016] Preferably, the lifting adjustment mechanism includes a lifting inner plate, a guide rod, an annular traction plate, a lifting outer plate, a rotating ring, a guide ring and an adjustment rod.

[0017] Preferably, the lifting inner plate is sleeved on the outer side of the driving screw and is threadedly connected to the driving screw. There are two of the guide rods. The two guide rods are respectively fixedly arranged on both sides of the top of the lifting inner plate and both penetrate through the inner wall of the reaction kettle and slide out of the reaction kettle. The annular traction plate is rotationally nested on the bottom of the lifting inner plate through a bearing and is fixedly connected to the top end of the T-shaped slide rod. The lifting outer plate is rotationally sleeved on the outer side of the lifting inner plate. The dispersion screw penetrates through the lifting outer plate and is threadedly connected to the lifting outer plate.

[0018] Preferably, there are a plurality of the rotating rings, the guide rings and the adjustment rods. The plurality of rotating rings are respectively slidably sleeved on the outer sides of the plurality of dispersion screws and are rotationally nested on the bottom of the lifting outer plate through bearings. The plurality of guide rings are respectively fixedly sleeved on the outer sides of the plurality of dispersion screws. The plurality of adjustment rods respectively slidably penetrate through both sides of the tops of the guide rings, and their bottom ends are all in contact with the adjacent arc-shaped plates.

[0019] The present invention also provides a method for preparing a slump-retention type polycarboxylate water reducer, which specifically includes the following steps:

[0020] S1. Add ethanol and a prepolymer containing a nitrile group into the reaction kettle, and enable the driving motor to drive the driving screw to rotate through the driving gear. When the driving screw rotates, it drives a plurality of dispersion screws to rotate around the driving screw as the axis through the dispersion disk and the plurality of hollow plates, so as to stir and mix the ethanol and the prepolymer containing a nitrile group;

[0021] S2. During the rotation of the driving screw, the lifting inner plate is continuously driven upward. When the lifting inner plate moves upward, it drives the rotating ring to move upward synchronously through the lifting outer plate. The rotating ring gradually releases the pressing on the adjusting rod and drives the dispersing screw to rotate self - sufficiently. At this time, under the push of multiple second springs, the adjusting rod moves upward synchronously inside the guiding ring. At the same time, multiple arc - shaped plates also drive multiple crushing rods to move upward respectively, thereby adjusting the stirring height. When the dispersing screw rotates self - sufficiently, it drives multiple crushing rods to rotate self - sufficiently through the arc - shaped plates, enhancing the stirring intensity;

[0022] S3. When the lifting inner plate moves upward, it drives the T - shaped slide rod to move upward synchronously inside the driving screw through the annular traction plate. When the T - shaped slide rod moves upward, it drives the first plugging block to rise synchronously through the fixed ring. When the upward movement distance of the lifting inner plate reaches the first threshold value, the first plugging block is collinear with multiple first gas channels in the horizontal direction. Subsequently, as the lifting inner plate continues to rise, the first plugging block gradually releases the plugging of the first gas channels. At this time, the dry hydrogen chloride gas provided by the dry hydrogen chloride gas input pipe enters the inside of the driving screw, passes through multiple second gas channels and multiple first gas channels, and then enters the inside of the dispersion plate. Subsequently, it disperses into multiple hollow plates, then enters multiple dispersing screws from the inside of the hollow plates, and finally flushes open multiple valves on the dispersing screws and disperses into the mixed solution for reaction;

[0023] S4. Since the dispersing screw is in a state of continuous revolution and self - rotation, when the dry hydrogen chloride gas enters the mixed solution, it will be shredded by the continuously rotating crushing rods, thereby forming smaller bubbles and evenly distributing them inside the mixed solution;

[0024] S5. When the upward movement distance of the lifting inner plate reaches the second threshold value, the first plugging block contacts the limit ring. At this time, due to the blockage of the limit ring, the first plugging block cannot continue to rise. Subsequently, as the lifting inner plate continues to rise, the first spring is stretched, and the first plugging block stays in place. When the upward movement distance of the lifting inner plate reaches the third threshold value, the plugging rod at the bottom of the first plugging block enters the inside of the second gas channel. At this time, the second gas channel can no longer supply dry hydrogen chloride gas to pass through;

[0025] S6. Add sodium hydroxide to the reaction kettle to adjust the pH value to prepare a slump - retaining polycarboxylate water - reducing agent.

[0026] The technical effects and advantages of the present invention:

[0027] The present invention is provided with a driving air intake mechanism, a trigger-type blocking mechanism, a dispersion and mixing mechanism, and a lifting adjustment mechanism, so as to drive the dispersion and mixing mechanism by means of the driving air intake mechanism, and then enable the dispersion and mixing mechanism to stir the prepolymer and ethanol to form a mixed solution. At the same time, when the driving air intake mechanism drives the dispersion and mixing mechanism, it will also drive the lifting adjustment mechanism, and then enable the lifting adjustment mechanism to drive the trigger-type blocking mechanism and the dispersion and mixing mechanism synchronously. While enhancing the stirring effect of the dispersion and mixing mechanism, dry hydrogen chloride gas is automatically input after stirring. As the lifting adjustment mechanism continuously drives the trigger-type blocking mechanism, the subsequent trigger-type blocking mechanism will block the driving air intake mechanism again, so that the dry hydrogen chloride gas cannot enter the interior of the dispersion and mixing mechanism. Compared with the same type of devices and methods in the prior art, the present invention has a high degree of automation and can make the dry hydrogen chloride gas evenly distributed in the mixed solution formed by the prepolymer and ethanol for reaction. At the same time, large bubbles can be crushed during the reaction process, making a large number of large bubbles become a large number of tiny bubbles, thereby effectively improving the reaction efficiency and being more suitable for the industrial production of slump-retention polycarboxylate water reducers. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic front sectional structure view of the whole of the present invention.

[0029] Figure 2 is a schematic front sectional structure view of the driving air intake mechanism of the present invention.

[0030] Figure 3 is a schematic front sectional structure view of the trigger-type blocking mechanism of the present invention.

[0031] Figure 4 is of the present invention Figure 2 magnified structure view of part A in

[0032] Figure 5 is a schematic front sectional structure view of the lifting adjustment mechanism of the present invention.

[0033] In the figure: 1, reaction kettle; 2, driving air inlet mechanism; 21, driving screw; 22, driving motor; 23, driving gear; 24, dry hydrogen chloride gas input pipe; 25, first gas channel; 3, trigger type plugging mechanism; 31, T-shaped slide bar; 32, limiting ring; 33, fixed ring; 34, first spring; 35, first plugging block; 36, second plugging block; 37, second gas channel; 38, plugging rod; 4, dispersion and mixing mechanism; 41, dispersion disc; 42, hollow plate; 43, dispersion screw; 44, valve; 45, arc plate; 46, connecting rod; 47, crushing rod; 48, second spring; 5, lifting type adjusting mechanism; 51, lifting inner plate; 52, guiding rod; 53, annular traction plate; 54, lifting outer plate; 55, rotating ring; 56, guiding ring; 57, adjusting rod. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0035] Embodiment 1

[0036] The present invention provides a device for preparing slump retaining polycarboxylate water reducer as Figures 1-5 shown, which includes a reaction kettle 1. A driving air inlet mechanism 2 is jointly arranged inside and at the bottom of the reaction kettle 1. A trigger type plugging mechanism 3 is arranged inside the driving air inlet mechanism 2. A dispersion and mixing mechanism 4 is arranged at the bottom of the inner cavity of the reaction kettle 1 and a lifting type adjusting mechanism 5 is arranged at the top of the inner cavity of the reaction kettle 1. The dispersion and mixing mechanism 4 and the lifting type adjusting mechanism 5 are both in transmission connection with the driving air inlet mechanism 2.

[0037] As Figure 2 shown in connection with Figure 3 the figure, the driving air inlet mechanism 2 includes a driving screw 21, a driving motor 22, driving gears 23, a dry hydrogen chloride gas input pipe 24 and a first gas channel 25. Among them, the driving screw 21 penetrates through the bottom of the reaction kettle 1 and is rotationally connected with the reaction kettle 1 through a bearing. The driving motor 22 is fixedly arranged on the right side of the bottom of the driving screw 21. There are two driving gears 23. The driving screw 21 is in transmission connection with the driving motor 22 through the two driving gears 23. The dry hydrogen chloride gas input pipe 24 is rotationally connected to the bottom end of the driving screw 21 through a rotary joint. There are multiple first gas channels 25, and the multiple first gas channels 25 are evenly opened at the outer bottom of the driving screw 21.

[0038] AsFigure 3 As shown, the trigger-type plugging mechanism 3 includes a T-shaped sliding rod 31, a limiting ring 32, a fixing ring 33, a first spring 34, a first plugging block 35, a second plugging block 36, a second gas channel 37 and a plugging rod 38. Among them, the T-shaped sliding rod 31 is slidably nested inside the driving screw rod 21. The limiting ring 32, the fixing ring 33, the first spring 34 and the first plugging block 35 are sleeved on the outside of the driving screw rod 21 in sequence from top to bottom. The limiting ring 32 is fixedly connected to the inner wall of the driving screw rod 21. The fixing ring 33 is fixedly sleeved on the outside of the T-shaped sliding rod 31. The first plugging block 35 is slidably sleeved on the outside of the T-shaped sliding rod 31. One end of the first spring 34 is fixedly connected to the fixing ring 33 and the other end is fixedly connected to the first plugging block 35. The second plugging block 36 is fixedly arranged at the bottom end of the T-shaped sliding rod 31. A plurality of the second gas channels 37 are provided. The plurality of the second gas channels 37 are uniformly opened at the bottom of the second plugging block 36 and extend to the top of the second plugging block 36. Both the first plugging block 35 and the second plugging block 36 are slidably arranged inside the driving screw rod 21. A plurality of the plugging rods 38 are provided. The plurality of the plugging rods 38 are uniformly and fixedly arranged at the bottom of the first plugging block 35.

[0039] By setting the above structure, when the T-shaped sliding rod 31 moves upward inside the driving screw rod 21, the first plugging block 35 is driven to rise synchronously through the fixing ring 33. As the first plugging block 35 moves continuously, the first plugging block 35 gradually releases the plugging of the first gas channel 25. At this time, the dry hydrogen chloride gas provided by the dry hydrogen chloride gas input pipe 24 can enter the inside of the driving screw rod 21 and then pass through the plurality of second gas channels 37 and the plurality of first gas channels 25 to enter the dispersion and mixing mechanism 4.

[0040] As Figure 2 with Figure 4As shown, the dispersion and mixing mechanism 4 includes a dispersion disk 41, a plurality of hollow plates 42 and a plurality of stirring components. Each stirring component includes a dispersion screw 43, a plurality of valves 44, a plurality of movable components and a plurality of second springs 48. Any set of the movable components includes two arc-shaped plates 45, four connecting rods 46 and two crushing rods 47. Among them, the dispersion disk 41 is fixedly sleeved on the outer bottom of the driving screw 21 and is communicated with the driving screw 21 through the first gas channel 25. The plurality of hollow plates 42 are uniformly and fixedly arranged on the outside of the dispersion disk 41 and are all communicated with the dispersion disk 41. The plurality of stirring components are respectively rotationally nested on the tops of the plurality of hollow plates 42. The dispersion screw 43 is rotationally connected to the adjacent hollow plate 42 through a bearing and is communicated. The plurality of valves 44 are uniformly and fixedly nested on the front and back of the dispersion screw 43. The plurality of second springs 48 are all sleeved on the outside of the dispersion screw 43 and are located between adjacent two movable components. The two arc-shaped plates 45 are respectively slidably nested on both sides of the dispersion screw 43. The four connecting rods 46 are fixedly arranged between the two arc-shaped plates 45. The two crushing rods 47 are respectively fixedly arranged on the outside of the two arc-shaped plates 45. A slider is arranged on the inner side of the arc-shaped plate 45. A chute is arranged on the side of the dispersion screw 43. The slider is slidably arranged inside the chute.

[0041] By setting the above structure, when the driving screw 21 rotates, the dispersion disk 41 and the plurality of hollow plates 42 drive the plurality of dispersion screws 43 to rotate around the driving screw 21 as the axis, so as to stir and mix ethanol and the prepolymer containing a nitrile group.

[0042] As Figure 5 As shown, the lifting adjustment mechanism 5 includes a lifting inner plate 51, a guide rod 52, an annular traction plate 53, a lifting outer plate 54, a rotating ring 55, a guide ring 56 and an adjustment rod 57. Among them, the lifting inner plate 51 is sleeved on the outside of the driving screw 21 and is threadedly connected to the driving screw 21. There are two guide rods 52. The two guide rods 52 are respectively fixedly arranged on both sides of the top of the lifting inner plate 51 and both penetrate through the inner wall of the reaction kettle 1 and slide to the outside of the reaction kettle 1. The annular traction plate 53 is rotationally nested on the bottom of the lifting inner plate 51 through a bearing and is fixedly connected to the top end of the T-shaped slide rod 31. The lifting outer plate 54 is rotationally sleeved on the outside of the lifting inner plate 51. The dispersion screw 43 penetrates through the lifting outer plate 54 and is threadedly connected to the lifting outer plate 54. There are a plurality of rotating rings 55, guide rings 56 and adjustment rods 57. The plurality of rotating rings 55 are respectively slidably sleeved on the outside of the plurality of dispersion screws 43 and are rotationally nested on the bottom of the lifting outer plate 54 through a bearing. The plurality of guide rings 56 are respectively fixedly sleeved on the outside of the plurality of dispersion screws 43. The plurality of adjustment rods 57 respectively slide through both sides of the top of the guide ring 56, and their bottom ends are all in contact with the adjacent arc-shaped plate 45.

[0043] By setting the above-mentioned dispersion and mixing mechanism 4 and the lifting adjustment mechanism 5, during the rotation of the driving screw 21, the lifting inner plate 51 is continuously driven to move upward. When the lifting inner plate 51 moves upward, the rotating ring 55 is driven to move upward synchronously through the lifting outer plate 54. The rotating ring 55 gradually releases the pressing on the adjusting rod 57 and drives the dispersion screw 43 to rotate self - sufficiently. At this time, under the push of multiple second springs 48, the adjusting rod 57 moves upward synchronously inside the guiding ring 56. At the same time, multiple arc - shaped plates 45 also drive multiple crushing rods 47 to move upward respectively, thereby adjusting the stirring height. When the dispersion screw 43 rotates self - sufficiently, it drives the multiple crushing rods 47 to rotate self - sufficiently through the arc - shaped plates 45, enhancing the stirring intensity.

[0044] Example 2

[0045] The present invention also provides a method for preparing a slump - retaining polycarboxylate water - reducing agent, which specifically includes the following steps:

[0046] S1. Add ethanol and a nitrile - containing prepolymer into the reaction kettle 1, and make the driving motor 22 drive the driving screw 21 to rotate through the driving gear 23. When the driving screw 21 rotates, it drives multiple dispersion screws 43 to rotate around the driving screw 21 as the axis through the dispersion disk 41 and multiple hollow plates 42, thereby stirring and mixing the ethanol and the nitrile - containing prepolymer.

[0047] S2. During the rotation of the driving screw 21, the lifting inner plate 51 is continuously driven to move upward. When the lifting inner plate 51 moves upward, the rotating ring 55 is driven to move upward synchronously through the lifting outer plate 54. The rotating ring 55 gradually releases the pressing on the adjusting rod 57 and drives the dispersion screw 43 to rotate self - sufficiently. At this time, under the push of multiple second springs 48, the adjusting rod 57 moves upward synchronously inside the guiding ring 56. At the same time, multiple arc - shaped plates 45 also drive multiple crushing rods 47 to move upward respectively, thereby adjusting the stirring height. When the dispersion screw 43 rotates self - sufficiently, it drives the multiple crushing rods 47 to rotate self - sufficiently through the arc - shaped plates 45, enhancing the stirring intensity.

[0048] S3. When the lifting inner plate 51 moves upward, it drives the T-shaped slide bar 31 to move upward synchronously inside the driving screw rod 21 through the annular traction plate 53. When the T-shaped slide bar 31 moves upward, it drives the first sealing block 35 to rise synchronously through the fixing ring 33. When the upward movement distance of the lifting inner plate 51 reaches the first threshold value, the first sealing block 35 is collinear with the multiple first gas channels 25 in the horizontal direction. Subsequently, as the lifting inner plate 51 continues to rise, the first sealing block 35 gradually releases the sealing of the first gas channels 25. At this time, the dry hydrogen chloride gas provided by the dry hydrogen chloride gas input pipe 24 enters the inside of the driving screw rod 21, passes through the multiple second gas channels 37 and the multiple first gas channels 25, and then enters the inside of the dispersion disc 41. Subsequently, it is dispersed into the multiple hollow plates 42, then enters the multiple dispersion screw rods 43 from the inside of the hollow plates 42, and finally flushes open the multiple valves 44 on the dispersion screw rods 43 and is dispersed into the mixed solution for reaction;

[0049] S4. Since the dispersion screw rod 43 is in a state of continuous revolution and rotation, when the dry hydrogen chloride gas enters the mixed solution, it will be shredded by the continuously rotating crushing rod 47, and then form smaller bubbles and be evenly distributed inside the mixed solution;

[0050] S5. When the upward movement distance of the lifting inner plate 51 reaches the second threshold value, the first sealing block 35 contacts the limit ring 32. At this time, due to the blocking of the limit ring 32, the first sealing block 35 cannot continue to rise. Subsequently, as the lifting inner plate 51 continues to rise, the first spring 34 is stretched, and the first sealing block 35 stays in place. When the upward movement distance of the lifting inner plate 51 reaches the third threshold value, the sealing rod 38 at the bottom of the first sealing block 35 enters the inside of the second gas channel 37. At this time, the second gas channel 37 can no longer supply dry hydrogen chloride gas to pass through;

[0051] S6. Add sodium hydroxide to the reaction kettle 1 to adjust the pH to prepare a slump-retention type polycarboxylate water reducer.

[0052] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An apparatus for preparing slump-retention polycarboxylate water reducer, comprising a reaction kettle, characterized in that: A driving air intake mechanism is provided inside the reactor and at the bottom of the reactor, a trigger-type blocking mechanism is provided inside the driving air intake mechanism, a dispersing and mixing mechanism is provided at the bottom of the inner cavity of the reactor, and a lifting and adjusting mechanism is provided at the top of the inner cavity of the reactor, and the dispersing and mixing mechanism and the lifting and adjusting mechanism are both drivingly connected to the driving air intake mechanism; The driving air intake mechanism comprises a driving screw, a driving motor, a driving gear, a dry hydrogen chloride gas input pipe and a first gas channel; The driving screw passes through the bottom of the reactor and is rotatably connected to the reactor through a bearing, the driving motor is fixedly arranged on the right side of the bottom of the driving screw, two driving gears are arranged, and the driving screw is transmission-connected to the driving motor through the two driving gears, the dry hydrogen chloride gas input pipe is rotatably connected to the bottom end of the driving screw through a rotating joint, and a plurality of the first gas channels are arranged, and the plurality of the first gas channels are evenly opened at the outer bottom of the driving screw; The dispersing and mixing mechanism comprises a dispersing disk, a plurality of hollow plates and a plurality of stirring components, the stirring components comprise a dispersing screw, a plurality of valves, a plurality of movable components and a plurality of second springs, and any group of the movable components comprises two arc-shaped plates, four connecting rods and two crushing rods; The dispersion disk is fixedly sleeved at the bottom of the outer side of the driving screw and is connected to the driving screw through the first gas channel. The plurality of hollow plates are evenly fixedly arranged at the outer side of the dispersion disk and are all connected to the dispersion disk. The plurality of stirring components are respectively rotatably nested at the top of the plurality of hollow plates. The dispersion screw is rotatably connected and connected to adjacent hollow plates through bearings. The plurality of valves are evenly fixedly nested at the front and back of the dispersion screw. The plurality of second springs are all sleeved at the outer side of the dispersion screw and are located between two adjacent movable components. The lifting adjustment mechanism comprises a lifting inner plate, a guide rod, an annular traction plate, a lifting outer plate, a rotating ring, a guide ring and an adjustment rod; The lifting inner plate is sleeved on the outside of the driving screw and is threadedly connected to the driving screw. Two guide rods are provided. The two guide rods are respectively fixed on both sides of the top of the lifting inner plate and both penetrate the inner wall of the reactor and slide to the outside of the reactor. The annular traction plate is rotatably nested at the bottom of the lifting inner plate through a bearing and is fixedly connected to the top of the T-shaped sliding rod. The lifting outer plate is rotatably sleeved on the outside of the lifting inner plate through a bearing. The dispersion screw penetrates the lifting outer plate and is threadedly connected to the lifting outer plate.

2. The device for preparing slump-retention polycarboxylate water reducer according to claim 1, characterized in that: The trigger-type blocking mechanism comprises a T-shaped sliding rod, a limiting ring, a fixing ring, a first spring, a first blocking block, a second blocking block, a second gas channel and a blocking rod.

3. The device for preparing slump-retention polycarboxylate water reducer according to claim 2, wherein: The T-shaped sliding rod is slidably nested inside the driving screw rod. The limiting ring, fixed ring, first spring and first sealing block are sleeved on the outside of the driving screw rod in sequence from top to bottom. The limiting ring is fixedly connected to the inner wall of the driving screw rod. The fixed ring is fixedly sleeved on the outside of the T-shaped sliding rod. The first sealing block is slidably sleeved on the outside of the T-shaped sliding rod. One end of the first spring is fixedly connected to the fixed ring and the other end is fixedly connected to the first sealing block. The second sealing block is fixedly arranged at the bottom end of the T-shaped sliding rod. There are multiple second gas channels, and the multiple second gas channels are evenly opened at the bottom of the second sealing block and extend to the top of the second sealing block. Both the first sealing block and the second sealing block are slidably arranged inside the driving screw rod. There are multiple sealing rods, and the multiple sealing rods are evenly and fixedly arranged at the bottom of the first sealing block.

4. The device for preparing slump-retention polycarboxylate water reducer according to claim 3, characterized in that: Two arc-shaped plates are respectively slidably nested on both sides of the dispersion screw rod. Four connecting rods are fixedly arranged between the two arc-shaped plates. Two crushing rods are respectively fixedly arranged on the outside of the two arc-shaped plates. A slider is arranged inside the arc-shaped plate. A chute is arranged on the side of the dispersion screw rod. The slider is slidably arranged inside the chute.

5. The device for preparing slump-retention polycarboxylate water reducer according to claim 4, characterized in that: There are multiple rotating rings, guiding rings and adjusting rods. The multiple rotating rings are respectively slidably sleeved on the outside of the multiple dispersion screw rods and are rotationally nested at the bottom of the lifting outer plate through bearings. The multiple guiding rings are respectively fixedly sleeved on the outside of the multiple dispersion screw rods. The multiple adjusting rods respectively slide through the two sides of the top of the guiding rings, and their bottom ends are in contact with the adjacent arc-shaped plates.

6. A method for preparing a slump-retention polycarboxylate water reducer, characterized in that: It is realized by using the device for preparing slump-retention polycarboxylate water reducer as described in claim 5, and specifically includes the following steps: S1. Add ethanol and a prepolymer containing a nitrile group into the reaction kettle, and enable the driving motor to drive the driving screw rod to rotate through the driving gear. When the driving screw rod rotates, it drives the multiple dispersion screw rods to rotate around the driving screw rod as the axis through the dispersion disk and the multiple hollow plates, so as to stir and mix the ethanol and the prepolymer containing a nitrile group. S2. During the rotation of the driving screw rod, it drives the lifting inner plate to continuously move upward. When the lifting inner plate moves upward, it drives the rotating ring to move upward synchronously through the lifting outer plate. The rotating ring gradually releases the pressing on the adjusting rod and drives the dispersion screw rod to rotate self. At this time, under the pushing of the multiple second springs, the adjusting rod moves upward synchronously inside the guiding ring. At the same time, the multiple arc-shaped plates also drive the multiple crushing rods to move upward respectively, so as to adjust the stirring height. When the dispersion screw rod rotates self, it drives the multiple crushing rods to rotate self through the arc-shaped plates, enhancing the stirring intensity. S3. When the lifting inner plate moves upward, it drives the T-shaped slide rod to move upward synchronously inside the driving screw through the annular traction plate. When the T-shaped slide rod moves upward, it drives the first sealing block to rise synchronously through the fixed ring. When the upward movement distance of the lifting inner plate reaches the first threshold, the first sealing block is collinear with the multiple first gas channels in the horizontal direction. Subsequently, as the lifting inner plate continues to rise, the first sealing block gradually releases the blockage of the first gas channels. At this time, the dry hydrogen chloride gas provided by the dry hydrogen chloride gas inlet pipe enters the inside of the driving screw, passes through the multiple second gas channels and the multiple first gas channels, and then enters the dispersion plate. Subsequently, it is dispersed into the multiple hollow plates, then enters the multiple dispersion screws from the inside of the hollow plates, and finally opens the multiple valves on the dispersion screws and is dispersed into the mixed solution for reaction; S4. Since the dispersion screw is in a state of continuous revolution and rotation, when the dry hydrogen chloride gas enters the mixed solution, it will be shredded by the continuously rotating crushing rod, and then form smaller bubbles and be evenly distributed inside the mixed solution; S5. When the upward movement distance of the lifting inner plate reaches the second threshold, the first sealing block contacts the limit ring. At this time, due to the blockage of the limit ring, the first sealing block cannot continue to rise. Subsequently, as the lifting inner plate continues to rise, the first spring is stretched, and the first sealing block stays in place. When the upward movement distance of the lifting inner plate reaches the third threshold, the blocking rod at the bottom of the first sealing block enters the inside of the second gas channel. At this time, the second gas channel can no longer supply dry hydrogen chloride gas to pass through; S6. Add sodium hydroxide to the reaction kettle to adjust the pH to prepare a slump-retention type polycarboxylate water reducer.

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