Preparation method for hydrogel loaded with plant essential oil

Abstract

The present invention relates to the technical field of hydrogel preparation. Disclosed is a preparation method for a hydrogel loaded with plant essential oil. Said preparation method is implemented by means of a hydrogel preparation device. The hydrogel preparation device comprises a reaction mechanism; the inside of the reaction mechanism is provided with a drive mechanism; the outer side of the drive mechanism is sequentially provided, from top to bottom, with a blocking mechanism, an inner stirring mechanism and an outer stirring mechanism; and the outer sides of the blocking mechanism and the inner stirring mechanism are jointly provided with a sealing mechanism. The present invention can reduce the time required for inputting deionized water, so as to improve the efficiency of preparing polymer aqueous solutions, and also uses vacuumizing to eliminate bubbles, so as to avoid bubbles without the need for heating mixed liquids, thus reducing the energy consumption while further improving the efficiency of preparing the polymer aqueous solutions.

Description

A method for preparing hydrogel loaded with plant essential oil Technical Field

[0001] The present invention relates to the technical field of hydrogel preparation, and in particular to a method for preparing a hydrogel loaded with plant essential oil. Background Art

[0002] Hydrogels are formed by cross-linking hydrophilic homopolymers or hydrophilic copolymers through chemical covalent bonds or physical forces. Due to their high water content, excellent flexibility and viscoelasticity, they have been widely used in drug controlled release, artificial organs, material separation and tissue engineering.

[0003] The invention patent with authorization publication number CN 111265712 B discloses a hydrogel loaded with plant essential oil and a preparation method thereof, wherein the hydrogel is made of two parts: a polymer aqueous solution and a microemulsion. When preparing the polymer aqueous solution, it is necessary to weigh polyvinyl alcohol, polyvinyl pyrrolidone, sodium methyl silicate, sodium pyrophosphate, bentonite and deionized water. After the polyvinyl alcohol and polyvinyl pyrrolidone are heated at 90°C for 4 hours to be thoroughly mixed, deionized water is added, and the polymer aqueous solution is obtained after the mixed solution cools to room temperature. Technical issues

[0004] However, after actual application by technicians in this field, it was found that the above preparation method still has some shortcomings. The most obvious one is that a large amount of deionized water is used in the preparation of the polymer aqueous solution. Therefore, when deionized water is added after the polyvinyl alcohol and polyvinyl pyrrolidone are mixed, it takes a long time to complete the addition using the traditional input method, which has a great impact on the preparation efficiency of the polymer aqueous solution.

[0005] After the addition of deionized water is completed, in order to eliminate bubbles in the mixed liquid, the existing technology often requires a timed insulation method, which is relatively time-consuming. Since the addition of deionized water results in a large total amount of the mixed liquid, the timed insulation method is also relatively energy-consuming, which significantly increases the preparation cost of the polymer aqueous solution and further reduces the preparation efficiency of the polymer aqueous solution.

[0006] Therefore, it is necessary to invent a method for preparing a hydrogel loaded with plant essential oil to solve the above problems. Technical Solutions

[0007] The object of the present invention is to provide a method for preparing a hydrogel loaded with plant essential oils to solve the problems raised in the above background technology.

[0008] To achieve the above objectives, the present invention provides the following technical solutions: a method for preparing a hydrogel loaded with plant essential oils, the method for preparing a hydrogel loaded with plant essential oils being implemented by a hydrogel preparation device, the hydrogel preparation device comprising a reaction mechanism, a driving mechanism being disposed within the reaction mechanism, a blocking mechanism, an internal stirring mechanism, and an external stirring mechanism being disposed on the outside of the driving mechanism in order from top to bottom, the blocking mechanism and the internal stirring mechanism being jointly provided with a sealing mechanism on the outside;

[0009] The reaction mechanism includes a reaction kettle, a partition plate, a deionized water channel and an annular filling block;

[0010] The partition plate is fixedly arranged on the top of the inner cavity of the reactor, and the partition plate divides the inner cavity of the reactor into an upper chamber and a lower chamber. The deionized water channel is vertically penetrated through the partition plate, and the annular filling block is fixedly arranged on the top of the inner cavity of the reactor;

[0011] The driving mechanism includes a reciprocating screw, a driving motor, a negative pressure tube, a negative pressure hole, a lower slide chute and an upper slide chute;

[0012] The reciprocating screw passes through the reactor and is rotatably connected to the reactor through a bearing. The drive motor is fixedly arranged on the right side of the top of the reactor and is transmission-connected to the reciprocating screw. The negative pressure pipe is connected to the top of the reciprocating screw through a rotary joint. The negative pressure hole is opened at the top of the front of the reciprocating screw. The lower slide and the upper slide are sequentially arranged on the side of the reciprocating screw from bottom to top.

[0013] The blocking mechanism includes a blocking plate, a movable sleeve, a side sliding groove, an upper sliding rod, a middle sliding rod and a lower sliding rod;

[0014] The sealing plate is slidingly sleeved on the outside of the reciprocating screw and seals the deionized water channel. The movable sleeve is rotatably arranged on the top of the sealing plate through a bearing. The side slide grooves are set on both sides of the movable sleeve. The upper slide rod is slidably arranged on the inner sides of the upper slide groove and the side slide groove along the vertical direction. The middle slide rod is slidably arranged inside the reciprocating screw along the vertical direction and is fixedly connected to the upper slide rod and the lower slide rod respectively. The lower slide rod is slidably arranged on the inner side of the lower slide groove along the vertical direction.

[0015] Preferably, the internal stirring mechanism includes a lifting sleeve, a rotating sleeve and an internal stirring rod.

[0016] Preferably, the lifting sleeve and the rotating sleeve are sequentially sleeved from top to bottom and arranged on the outside of the reciprocating screw, the lifting sleeve is transmission-connected to the reciprocating screw, the rotating sleeve is rotatably arranged on the bottom of the lifting sleeve through a bearing, and there are multiple internal stirring rods, and the multiple internal stirring rods are evenly fixed on the outside of the rotating sleeve.

[0017] Preferably, the external stirring mechanism includes a rotating bottom plate, a side rod and an external stirring rod.

[0018] Preferably, the rotating base plate is fixedly sleeved on the outer bottom of the reciprocating screw and is rotatably nested in the bottom of the inner cavity of the reactor through a bearing. There are two side rods and multiple external stirring rods. The two side rods are respectively fixed on both sides of the top of the rotating base plate, and the multiple external stirring rods are evenly fixed on the inner sides of the two side rods.

[0019] Preferably, the sealing mechanism includes an annular sealing ring, an inner sliding groove, a guide column and a return spring.

[0020] Preferably, the annular sealing ring is sleeved on the outside of the movable sleeve and slides in contact with the inner wall of the reaction mechanism. The inner slide groove is opened on the inner side of the annular sealing ring. The guide column slides through the partition plate in the vertical direction and its top end is slidably arranged on the inner side of the inner slide groove. The bottom end of the guide column is fixedly connected to the lifting sleeve, and the reset spring is fixedly connected between the guide column and the inner wall of the inner slide groove.

[0021] Preferably, the method specifically comprises the following steps:

[0022] S1. Add polyvinyl alcohol, polyvinyl pyrrolidone, sodium methyl silicate, sodium pyrophosphate, and bentonite into the lower chamber through the feeding channel with a sealed door on the rear side of the reactor, then close the sealed door and start the negative pressure device connected to the drive motor and the negative pressure tube;

[0023] S2. After the negative pressure device is started, it continuously generates negative pressure, which is continuously transmitted to the interior of the upper chamber through the negative pressure tube, reciprocating screw and negative pressure hole. The air inside the upper chamber is continuously extracted. Then, the negative pressure continuously draws deionized water from the water source through the water supply pipe connected to the top left side of the reactor. The deionized water is continuously input into the upper chamber through the water supply pipe for storage;

[0024] S3. After the drive motor is started, it drives the reciprocating screw to rotate continuously. When the reciprocating screw rotates, it drives the rotating base plate to rotate continuously, and drives the lifting sleeve guided by the guide column to rise continuously. During the rotation of the rotating base plate, the side rods drive multiple external stirring rods to stir the raw materials. During the rising of the lifting sleeve, the rotating sleeve and the guide column are driven to rise synchronously;

[0025] S4. During the upward movement of the rotating sleeve, the multiple inner stirring rods are driven upward by the rotating sleeve, and the upper sliding rod is driven to continuously rise inside the side slide groove by the lower sliding rod and the middle sliding rod. At the same time, the upper sliding rod and the lower sliding rod are driven to continuously rotate by the reciprocating screw. When the rotating lower sliding rod is driven to rise by the rotating sleeve, the multiple inner stirring rods are driven to continuously rotate by the rotating sleeve, thereby stirring the raw materials synchronously. During the upward movement of the guide column, the annular sealing ring is driven to continuously rise by the return spring;

[0026] S5. When the lifting distance of the lifting sleeve reaches the first threshold, the inner chute blocks the water supply pipe. At this time, deionized water can no longer be input into the upper chamber, and the negative pressure hole starts to vacuum the interior of the chamber;

[0027] S6. When the lifting distance of the lifting sleeve reaches the second threshold, the upper slide moves from the bottom inner side of the side slide to the top inner side of the side slide. Subsequently, as the lifting sleeve continues to move upward, the upper slide drives the blocking plate to rise synchronously through the movable sleeve. After the blocking plate rises, the blockage of the deionized water channel is released. At this time, the deionized water inside the upper chamber quickly passes through the deionized water channel under the action of gravity and enters the lower chamber, and is mixed with the mixed material for a second time, while cooling the material. In the process of deionized water entering the lower chamber, the air inside the lower chamber continuously enters the upper chamber under the pressure of the deionized water, and is then discharged through the negative pressure hole;

[0028] S7. When the lifting distance of the lifting sleeve reaches the third threshold, the top of the annular sealing ring contacts the bottom of the annular filling block. At this time, due to the obstruction of the annular filling block, the annular sealing ring cannot continue to rise, thereby ensuring that the annular sealing ring continues to seal the water supply pipe. At the same time, as the lifting sleeve continues to rise, the guide column continues to rise inside the annular sealing ring and continuously compresses the return spring;

[0029] S8, when the lifting sleeve reaches the fourth threshold, the lifting sleeve moves to the top of the reciprocating thread on the outside of the reciprocating screw. As the reciprocating screw continues to rotate, the lifting sleeve begins to move down and reset. When the lifting sleeve reaches the fifth threshold, the blocking plate blocks the deionized water channel again, and the interiors of the upper chamber and the lower chamber are both in a vacuum state. At this time, the negative pressure equipment is shut down;

[0030] S9, when the lifting sleeve descends to the sixth threshold, the lifting sleeve reaches the bottom end of the reciprocating thread on the outer side of the reciprocating screw, that is, the initial position, at which time the drive motor is stopped and the sealing valve on the output pipe at the bottom right of the reactor is opened, and the polymer aqueous solution in the lower chamber is discharged through the output pipe;

[0031] S10, mixing the plant essential oil, deionized water, emulsifier and co-emulsifier and stirring to obtain a uniform and clear microemulsion, then mixing the above-mentioned polymer aqueous solution and microemulsion in proportion, and obtaining a hydrogel containing the microemulsion after a cyclic freezing and thawing operation. Beneficial effects

[0032] Technical effects and advantages of the present invention:

[0033] The present invention is provided with a driving mechanism, a blocking mechanism, an internal stirring mechanism, an external stirring mechanism and a sealing mechanism, so that the driving mechanism can simultaneously drive the blocking mechanism, the internal stirring mechanism and the external stirring mechanism. After the blocking mechanism is driven, it drives the internal stirring mechanism to rotate continuously. After the internal stirring mechanism is driven, it drives the blocking mechanism and the sealing mechanism to move upward synchronously. At this time, the internal stirring mechanism in a rotating and ascending state cooperates with the external stirring mechanism to achieve stirring of the material and adjustment of the stirring height. Subsequently, as the internal stirring mechanism continues to rise, the internal stirring mechanism first drives the sealing mechanism to achieve sealing of the water supply pipe, and then stops the input of deionized water while providing a precondition for subsequent negative pressure vacuuming. Then the blocking mechanism is driven to release the blocking of the upper chamber and the lower chamber. At this time, under the action of gravity, the deionized water is mixed with the material and the material is cooled. Subsequently, the internal stirring mechanism that completes the stirring height adjustment cooperates with the external stirring mechanism to complete the rapid mixing of the mixed liquid. The negative pressure generated by the driving mechanism vacuumizes the upper chamber and the lower chamber. Compared with the same type of devices and methods in the prior art, the present invention can shorten the time required for deionized water input, thereby accelerating the preparation efficiency of the polymer aqueous solution. At the same time, vacuuming is used to eliminate bubbles. Therefore, there is no need to heat the mixed liquid while avoiding bubbles, reducing energy consumption and further improving the preparation efficiency of the polymer aqueous solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic diagram of the overall front cross-sectional structure of the present invention.

[0035] FIG2 is a schematic diagram of a partial front cross-sectional structure of the reaction mechanism and the driving mechanism of the present invention.

[0036] FIG3 is a schematic diagram of a partial front cross-sectional structure of the driving mechanism and the blocking mechanism of the present invention.

[0037] FIG4 is a schematic diagram of the front cross-sectional structure of the inner stirring mechanism and the outer stirring mechanism of the present invention.

[0038] FIG5 is a schematic diagram of a front cross-sectional structure of the sealing mechanism of the present invention.

[0039] In the figure: 1. reaction mechanism; 11. reactor; 12. partition plate; 13. deionized water channel; 14. annular filling block; 2. driving mechanism; 21. reciprocating screw; 22. driving motor; 23. negative pressure tube; 24. negative pressure hole; 25. lower slide; 26. upper slide; 3. blocking mechanism; 31. blocking plate; 32. movable sleeve; 33. side slide; 34. upper slide bar; 35. middle slide bar; 36. lower slide bar; 4. internal stirring mechanism; 41. lifting sleeve; 42. rotating sleeve; 43. internal stirring rod; 5. external stirring mechanism; 51. rotating bottom plate; 52. side rod; 53. external stirring rod; 6. sealing mechanism; 61. annular sealing ring; 62. internal slide; 63. guide column; 64. reset spring. Modes for Carrying Out the Invention

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0041] The present invention provides a method for preparing a hydrogel loaded with plant essential oil as shown in Figures 1-5. The method for preparing a hydrogel loaded with plant essential oil is implemented by a hydrogel preparation device. The hydrogel preparation device includes a reaction mechanism 1, a driving mechanism 2 is provided inside the reaction mechanism 1, and a blocking mechanism 3, an internal stirring mechanism 4 and an external stirring mechanism 5 are provided on the outside of the driving mechanism 2 from top to bottom. A sealing mechanism 6 is provided on the outside of the blocking mechanism 3 and the internal stirring mechanism 4.

[0042] As shown in Figure 2, the reaction mechanism 1 includes a reactor 11, a partition plate 12, a deionized water channel 13 and an annular filling block 14, wherein the partition plate 12 is fixedly arranged at the top of the inner cavity of the reactor 11, and the partition plate 12 divides the inner cavity of the reactor 11 into an upper chamber and a lower chamber. The deionized water channel 13 is vertically penetrated on the partition plate 12, and the annular filling block 14 is fixedly arranged at the top of the inner cavity of the reactor 11.

[0043] As shown in Figures 2 and 3, the driving mechanism 2 includes a reciprocating screw 21, a driving motor 22, a negative pressure tube 23, a negative pressure hole 24, a lower slide chute 25 and an upper slide chute 26, wherein the reciprocating screw 21 passes through the reactor 11 and is rotatably connected to the reactor 11 through a bearing, the driving motor 22 is fixedly arranged on the right side of the top of the reactor 11 and is transmission-connected to the reciprocating screw 21, the negative pressure tube 23 is connected to the top of the reciprocating screw 21 through a rotary joint, the negative pressure hole 24 is opened at the top of the front of the reciprocating screw 21, and the lower slide chute 25 and the upper slide chute 26 are sequentially arranged on the side of the reciprocating screw 21 from bottom to top.

[0044] By setting up the above structure, after starting the negative pressure device connected to the drive motor 22 and the negative pressure tube 23, the drive motor 22 drives the reciprocating screw 21 to rotate continuously, and the negative pressure is continuously transmitted to the interior of the upper chamber through the negative pressure tube 23, the reciprocating screw 21 and the negative pressure hole 24. The air inside the upper chamber is continuously extracted, and then the negative pressure continuously sucks deionized water from the water source through the water supply pipe connected to the top left side of the reactor 11, and the deionized water is continuously input into the upper chamber through the water supply pipe for storage.

[0045] As shown in Figures 3 and 4, the blocking mechanism 3 includes a blocking plate 31, a movable sleeve 32, a side slide groove 33, an upper slide rod 34, an intermediate slide rod 35 and a lower slide rod 36, wherein the blocking plate 31 is slidably sleeved on the outside of the reciprocating screw 21 and blocks the deionized water channel 13, the movable sleeve 32 is rotatably set on the top of the blocking plate 31 through a bearing, the side slide groove 33 is set on both sides of the movable sleeve 32, the upper slide rod 34 is slidably set in the upper slide groove 26 and the inner side of the side slide groove 33 along the vertical direction, the intermediate slide rod 35 is slidably set in the reciprocating screw 21 along the vertical direction and is fixedly connected to the upper slide rod 34 and the lower slide rod 36 respectively, and the lower slide rod 36 is slidably set in the lower groove 25 along the vertical direction.

[0046] By setting the above structure, when the lower slide bar 36 rises, the middle slide bar 35 drives the upper slide bar 34 to continue to rise inside the side slide groove 33. As the upper slide bar 34 continues to rise, the upper slide bar 34 moves from the bottom of the inner side of the side slide groove 33 to the top of the inner side slide groove 33. Subsequently, as the upper slide bar 34 continues to rise, the upper slide bar 34 drives the sealing plate 31 to release the blockage of the deionized water channel 13 through the movable sleeve 32. At this time, the deionized water inside the upper chamber quickly passes through the deionized water channel 13 under the action of gravity and enters the lower chamber, and is mixed with the mixed material for a second time, while cooling the material at the same time.

[0047] As shown in Figure 4, the internal stirring mechanism 4 includes a lifting sleeve 41, a rotating sleeve 42 and an internal stirring rod 43, wherein the lifting sleeve 41 and the rotating sleeve 42 are sequentially sleeved from top to bottom and arranged on the outside of the reciprocating screw 21, the lifting sleeve 41 is transmission-connected to the reciprocating screw 21, the rotating sleeve 42 is rotatably arranged at the bottom of the lifting sleeve 41 through a bearing, and a plurality of internal stirring rods 43 are provided, and the plurality of internal stirring rods 43 are evenly fixed on the outside of the rotating sleeve 42.

[0048] By setting the above structure, when the reciprocating screw 21 rotates, the lower slide rod 36 is driven to rotate through the lower slide groove 25, and the lifting sleeve 41 is driven to continuously rise. When the lower slide rod 36 rotates, the multiple inner stirring rods 43 are driven to rotate synchronously through the rotating sleeve 42. When the lifting sleeve 41 rises, the multiple inner stirring rods 43 are driven to rise synchronously through the rotating sleeve 42, thereby continuously adjusting the stirring height while mixing the materials, so that the mixed liquid can be better stirred after the subsequent addition of deionized water.

[0049] As shown in Figure 4, the external stirring mechanism 5 includes a rotating base plate 51, a side rod 52 and an external stirring rod 53, wherein the rotating base plate 51 is fixedly sleeved on the outer bottom of the reciprocating screw 21 and is rotatably nested in the bottom of the inner cavity of the reactor 11 through a bearing. There are two side rods 52, and there are multiple external stirring rods 53. The two side rods 52 are respectively fixed on both sides of the top of the rotating base plate 51, and the multiple external stirring rods 53 are evenly fixed on the inner sides of the two side rods 52.

[0050] By setting the above structure, the reciprocating screw 21 drives the rotating base plate 51 to rotate continuously when rotating. During the rotation of the rotating base plate 51, the side rods 52 drive the multiple external stirring rods 53 to stir the raw materials.

[0051] As shown in Figure 5, the sealing mechanism 6 includes an annular sealing ring 61, an inner slide groove 62, a guide column 63 and a reset spring 64, wherein the annular sealing ring 61 is sleeved on the outside of the movable sleeve 32 and slides in contact with the inner wall of the reaction mechanism 1, the inner slide groove 62 is opened on the inner side of the annular sealing ring 61, the guide column 63 slides through the partition plate 12 in the vertical direction and its top end is slidably arranged on the inner side of the inner slide groove 62, the bottom end of the guide column 63 is fixedly connected to the lifting sleeve 41, and the reset spring 64 is fixedly connected between the guide column 63 and the inner wall of the inner slide groove 62.

[0052] By setting the above structure, the guide column 63 rises synchronously during the rising process of the lifting sleeve 41. During the rising process of the guide column 63, the annular sealing ring 61 is driven to continue to rise through the return spring 64. As the lifting sleeve 41 continues to rise, the inner slide groove 62 blocks the water supply pipe. At this time, deionized water can no longer be input into the upper chamber, and the negative pressure hole 24 begins to vacuum the interior of the chamber. Subsequently, when the top of the annular sealing ring 61 is fitted with the bottom of the annular filling block 14, the annular sealing ring 61 cannot continue to rise due to the obstruction of the annular filling block 14, so as to ensure that the annular sealing ring 61 continues to seal the water supply pipe. At the same time, due to the continued rise of the lifting sleeve 41, the guide column 63 continues to rise inside the annular sealing ring 61 and continuously compresses the return spring 64. Example 2

[0053] The method specifically comprises the following steps:

[0054] S1, adding polyvinyl alcohol, polyvinyl pyrrolidone, sodium methyl silicate, sodium pyrophosphate and bentonite into the lower chamber through the feeding channel with a sealed door on the rear side of the reactor 11, then closing the sealed door and starting the negative pressure device connected to the drive motor 22 and the negative pressure pipe 23;

[0055] S2. After the negative pressure device is started, it continuously generates negative pressure, which is continuously transmitted to the interior of the upper chamber through the negative pressure pipe 23, the reciprocating screw 21 and the negative pressure hole 24. The air inside the upper chamber is continuously extracted. Then, the negative pressure continuously sucks deionized water from the water source through the water supply pipe connected to the top left side of the reactor 11. The deionized water is continuously input into the upper chamber through the water supply pipe for storage;

[0056] S3. After the drive motor 22 is started, it drives the reciprocating screw 21 to rotate continuously. When the reciprocating screw 21 rotates, it drives the rotating base plate 51 to rotate continuously, and drives the lifting sleeve 41 guided by the guide column 63 to rise continuously. During the rotation of the rotating base plate 51, the side rods 52 drive the multiple external stirring rods 53 to stir the raw materials. During the rise of the lifting sleeve 41, the rotating sleeve 42 and the guide column 63 are driven to rise synchronously.

[0057] S4. During the upward movement of the rotating sleeve 42, the multiple inner stirring rods 43 are driven to rise by the rotating sleeve 42, and the upper slide rod 34 is driven to continue to rise inside the side slide groove 33 by the lower slide rod 36 and the middle slide rod 35. At the same time, the upper slide rod 34 and the lower slide rod 36 are driven to rotate continuously by the reciprocating screw 21. When the rotating lower slide rod 36 is driven to rise by the rotating sleeve 42, the multiple inner stirring rods 43 are driven to rotate continuously by the rotating sleeve 42, thereby stirring the raw materials synchronously. During the upward movement of the guide column 63, the annular sealing ring 61 is driven to continue to rise by the return spring 64;

[0058] S5. When the lifting distance of the lifting sleeve 41 reaches the first threshold, the inner chute 62 blocks the water supply pipe. At this time, deionized water can no longer be input into the upper chamber, and the negative pressure hole 24 starts to vacuum the chamber.

[0059] S6. When the lifting distance of the lifting sleeve 41 reaches the second threshold, the upper slide bar 34 moves from the bottom inner side of the side slide groove 33 to the top inner side slide groove 33. Subsequently, as the lifting sleeve 41 continues to move upward, the upper slide bar 34 drives the blocking plate 31 to rise synchronously through the movable sleeve 32. After the blocking plate 31 rises, the blockage of the deionized water channel 13 is released. At this time, the deionized water inside the upper chamber quickly passes through the deionized water channel 13 under the action of gravity and enters the lower chamber, and is mixed with the mixed material for the second time, while cooling the material. In the process of the deionized water entering the lower chamber, the air inside the lower chamber continuously enters the upper chamber under the pressure of the deionized water, and is then discharged through the negative pressure hole 24;

[0060] S7: When the lifting distance of the lifting sleeve 41 reaches the third threshold, the top of the annular sealing ring 61 is in contact with the bottom of the annular filling block 14. At this time, due to the obstruction of the annular filling block 14, the annular sealing ring 61 cannot continue to rise, thereby ensuring that the annular sealing ring 61 continues to seal the water supply pipe. At the same time, as the lifting sleeve 41 continues to rise, the guide column 63 continues to rise inside the annular sealing ring 61 and continuously compresses the return spring 64.

[0061] S8, when the lifting sleeve 41 reaches the fourth threshold value, the lifting sleeve 41 moves to the top of the reciprocating thread on the outside of the reciprocating screw 21. Subsequently, as the reciprocating screw 21 continues to rotate, the lifting sleeve 41 begins to move downward and reset. When the lifting sleeve 41 reaches the fifth threshold value, the blocking plate 31 blocks the deionized water channel 13 again, and the interiors of the upper chamber and the lower chamber are both in a vacuum state. At this time, the negative pressure device is shut down;

[0062] S9, when the descending distance of the lifting sleeve 41 reaches the sixth threshold, the lifting sleeve 41 reaches the bottom end of the reciprocating thread on the outer side of the reciprocating screw 21, that is, the initial position, at which time the drive motor 22 is stopped, and the sealing valve on the output pipe at the bottom right side of the reactor 11 is opened, and the polymer aqueous solution in the lower chamber is discharged through the output pipe;

[0063] S10, mixing the plant essential oil, deionized water, emulsifier and co-emulsifier and stirring to obtain a uniform and clear microemulsion, then mixing the above-mentioned polymer aqueous solution and microemulsion in proportion, and obtaining a hydrogel containing the microemulsion after a cyclic freezing and thawing operation.

[0064] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a hydrogel loaded with plant essential oil, characterized in that: The method for preparing a hydrogel loaded with plant essential oil is implemented by a hydrogel preparation device, the hydrogel preparation device comprising a reaction mechanism (1), a driving mechanism (2) being arranged inside the reaction mechanism (1), a blocking mechanism (3), an internal stirring mechanism (4) and an external stirring mechanism (5) being arranged on the outside of the driving mechanism (2) in order from top to bottom, and a sealing mechanism (6) being arranged on the outside of the blocking mechanism (3) and the internal stirring mechanism (4); The reaction mechanism (1) comprises a reaction kettle (11), a partition plate (12), a deionized water channel (13) and an annular filling block (14); The partition plate (12) is fixedly arranged at the top of the inner cavity of the reactor (11), and the partition plate (12) divides the inner cavity of the reactor (11) into an upper chamber and a lower chamber. The deionized water channel (13) is vertically penetrated on the partition plate (12), and the annular filling block (14) is fixedly arranged at the top of the inner cavity of the reactor (11); The driving mechanism (2) comprises a reciprocating screw (21), a driving motor (22), a negative pressure tube (23), a negative pressure hole (24), a lower slide groove (25) and an upper slide groove (26); The reciprocating screw (21) passes through the reactor (11) and is rotationally connected to the reactor (11) via a bearing; the driving motor (22) is fixedly arranged on the right side of the top of the reactor (11) and is transmission-connected to the reciprocating screw (21); the negative pressure pipe (23) is connected to the top of the reciprocating screw (21) via a rotary joint; the negative pressure hole (24) is opened at the top of the front face of the reciprocating screw (21); the lower slide groove (25) and the upper slide groove (26) are sequentially arranged from bottom to top through the side of the reciprocating screw (21); The blocking mechanism (3) comprises a blocking plate (31), a movable sleeve (32), a side sliding groove (33), an upper sliding rod (34), a middle sliding rod (35) and a lower sliding rod (36); The blocking plate (31) is slidably sleeved on the outside of the reciprocating screw (21) and blocks the deionized water channel (13); the movable sleeve (32) is rotatably arranged on the top of the blocking plate (31) through a bearing; the side slide grooves (33) are penetrated and arranged on both sides of the movable sleeve (32); the upper slide rod (34) is slidably arranged on the inner sides of the upper slide groove (26) and the side slide grooves (33) along the vertical direction; the middle slide rod (35) is slidably arranged inside the reciprocating screw (21) along the vertical direction and is fixedly connected to the upper slide rod (34) and the lower slide rod (36) respectively; the lower slide rod (36) is slidably arranged on the inner side of the lower slide groove (25) along the vertical direction.

2. The method for preparing a hydrogel loaded with plant essential oil according to claim 1, wherein: The internal stirring mechanism (4) comprises a lifting sleeve (41), a rotating sleeve (42) and an internal stirring rod (43).

3. The method for preparing a hydrogel loaded with plant essential oil according to claim 2, wherein: The lifting sleeve (41) and the rotating sleeve (42) are sequentially sleeved and arranged on the outside of the reciprocating screw (21) from top to bottom, the lifting sleeve (41) is transmission-connected to the reciprocating screw (21), the rotating sleeve (42) is rotatably arranged on the bottom of the lifting sleeve (41) via a bearing, and a plurality of inner stirring rods (43) are provided, and the plurality of inner stirring rods (43) are evenly fixedly arranged on the outside of the rotating sleeve (42).

4. The method for preparing a hydrogel loaded with plant essential oil according to claim 3, wherein: The external stirring mechanism (5) comprises a rotating bottom plate (51), a side rod (52) and an external stirring rod (53).

5. The method for preparing a hydrogel loaded with plant essential oil according to claim 4, characterized in that: The rotating bottom plate (51) is fixedly sleeved on the outer bottom of the reciprocating screw (21) and is rotatably nested in the bottom of the inner cavity of the reactor (11) through a bearing. Two side rods (52) are provided, and a plurality of external stirring rods (53) are provided. The two side rods (52) are respectively fixedly provided on both sides of the top of the rotating bottom plate (51), and the plurality of external stirring rods (53) are evenly fixedly provided on the inner sides of the two side rods (52).

6. The method for preparing a hydrogel loaded with plant essential oil according to claim 5, characterized in that: The sealing mechanism (6) comprises an annular sealing ring (61), an inner sliding groove (62), a guide column (63) and a return spring (64).

7. The method for preparing a hydrogel loaded with plant essential oil according to claim 6, characterized in that: The annular sealing ring (61) is sleeved on the outside of the movable sleeve (32) and is slidably fitted with the inner wall of the reaction mechanism (1); the inner slide groove (62) is opened on the inner side of the annular sealing ring (61); the guide column (63) slides through the partition plate (12) in the vertical direction and its top end is slidably arranged on the inner side of the inner slide groove (62); the bottom end of the guide column (63) is fixedly connected to the lifting sleeve (41); and the return spring (64) is fixedly connected between the guide column (63) and the inner wall of the inner slide groove (62).

8. The method for preparing a hydrogel loaded with plant essential oil according to claim 7, characterized in that: The method specifically comprises the following steps: S1, adding polyvinyl alcohol, polyvinyl pyrrolidone, sodium methyl silicate, sodium pyrophosphate and bentonite into the lower chamber through the feeding channel with a sealed door at the rear side of the reaction kettle (11), then closing the sealed door and starting the negative pressure device connected to the drive motor (22) and the negative pressure pipe (23); S2. After the negative pressure device is started, negative pressure is continuously generated. The negative pressure is continuously transmitted to the interior of the upper chamber through the negative pressure tube (23), the reciprocating screw (21) and the negative pressure hole (24). The air inside the upper chamber is continuously extracted. Then, the negative pressure continuously draws deionized water from the water source through the water supply pipe connected to the top of the left side of the reactor (11). The deionized water is continuously input into the upper chamber through the water supply pipe for storage. S3, after the driving motor (22) is started, the reciprocating screw (21) is driven to rotate continuously, and the reciprocating screw (21) drives the rotating base plate (51) to rotate continuously when rotating, and drives the lifting sleeve (41) guided by the guide column (63) to continuously rise, and during the rotation of the rotating base plate (51), the side rods (52) drive the plurality of external stirring rods (53) to stir the raw materials, and during the rising of the lifting sleeve (41), the rotating sleeve (42) and the guide column (63) are driven to rise synchronously; S4, during the upward movement of the rotating sleeve (42), the rotating sleeve (42) drives the plurality of inner stirring rods (43) to rise, and the lower sliding rod (36) and the middle sliding rod (35) drive the upper sliding rod (34) to continuously rise inside the side sliding groove (33). Meanwhile, the upper sliding rod (34) and the lower sliding rod (36) are continuously rotated under the drive of the reciprocating screw (21). When the rotating lower sliding rod (36) is driven upward by the rotating sleeve (42), the plurality of inner stirring rods (43) are continuously rotated through the rotating sleeve (42), thereby synchronously stirring the raw materials. During the upward movement of the guide column (63), the return spring (64) drives the annular sealing ring (61) to continuously rise; S5, when the lifting distance of the lifting sleeve (41) reaches a first threshold, the inner slide groove (62) blocks the water supply pipe, and deionized water can no longer be input into the upper chamber, and the negative pressure hole (24) starts to evacuate the chamber; S6, when the lifting sleeve (41) reaches the second threshold value, the upper slide bar (34) moves from the bottom of the inner side of the side slide groove (33) to the top of the inner side of the side slide groove (33), and then as the lifting sleeve (41) continues to move upward, the upper slide bar (34) drives the blocking plate (31) to rise synchronously through the movable sleeve (32), and the blocking plate (31) is lifted after the deionized water channel (13) is blocked. At this time, the deionized water in the upper chamber quickly passes through the deionized water channel (13) under the action of gravity and enters the lower chamber, and is mixed with the mixed material for a second time, and the material is cooled at the same time. In the process of the deionized water entering the lower chamber, the air in the lower chamber continuously enters the upper chamber under the pressure of the deionized water, and is then discharged through the negative pressure hole (24); S7, when the lifting distance of the lifting sleeve (41) reaches the third threshold, the top of the annular sealing ring (61) fits against the bottom of the annular filling block (14). At this time, due to the obstruction of the annular filling block (14), the annular sealing ring (61) cannot continue to rise, so as to ensure that the annular sealing ring (61) continues to seal the water supply pipe. At the same time, due to the subsequent continued rise of the lifting sleeve (41), the guide column (63) continues to rise inside the annular sealing ring (61) and continuously compresses the return spring (64); S8, when the lifting sleeve (41) reaches the fourth threshold value, the lifting sleeve (41) moves to the top of the reciprocating thread on the outside of the reciprocating screw (21), and then as the reciprocating screw (21) continues to rotate, the lifting sleeve (41) starts to move downward and reset. When the lifting sleeve (41) reaches the fifth threshold value, the blocking plate (31) blocks the deionized water channel (13) again, and the interiors of the upper chamber and the lower chamber are both in a vacuum state, and the negative pressure device is shut down at this time; S9, when the descending distance of the lifting sleeve (41) reaches the sixth threshold value, the lifting sleeve (41) reaches the bottom end of the reciprocating thread on the outer side of the reciprocating screw (21), that is, the initial position, at which time the driving motor (22) is stopped, and at the same time, the sealing valve on the bottom output pipe on the right side of the reactor (11) is opened, and the polymer aqueous solution in the lower chamber is output through the output pipe; S10, mixing the plant essential oil, deionized water, emulsifier and co-emulsifier and stirring to obtain a uniform and clear microemulsion, then mixing the above polymer aqueous solution and the microemulsion in proportion, and obtaining a hydrogel containing the microemulsion after a cyclic freezing and thawing operation.

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