Microcapsule embedded composite essential oil preparation device and method and essential oil

Abstract

The invention belongs to the technical field of preparation of feed additives, and relates to a microcapsule embedding composite essential oil preparation device, a microcapsule embedding composite essential oil preparation method and essential oil, the microcapsule embedding composite essential oil preparation device provided by the invention is characterized in that a premixing stirrer, a vacuum container, an emulsification assembly, a centrifugal pump and a spray drying granulator are connected through a pipeline conveying device; through a conveying pipe and a stirring tank of the pipeline conveying device, conveying, adding and mixing of materials are achieved, and preparation of the composite essential oil is achieved. Meanwhile, the microcapsule embedded compound essential oil for the feed is prepared by compounding cinnamyl aldehyde, eugenol, thymol, carvacrol and tea tree essential oil according to a certain proportion, the problem that single essential oil is single in effect is solved, and the microcapsule embedded compound essential oil has the effects of resisting oxidation, reducing stress and promoting reproductive organ development of laying ducks, so that the laying rate is increased, and the egg quality is improved.

Description

Technical Field

[0001] This invention relates to the field of feed additive preparation technology, specifically to a microcapsule-encapsulated composite essential oil preparation apparatus, method, and essential oil. Background Technology

[0002] The traditional free-range and pen-raising models of poultry are more prone to infectious diseases such as E. coli. Moreover, the lack of immunity and stress in caged poultry, as well as the decline in egg quality in the later stages of egg production, are bottlenecks restricting the large-scale farming of poultry.

[0003] Existing essential oil preparation equipment mainly consists of simple combinations of stirring, heating, or spray drying devices. Material transfer between devices is often done manually or via fixed pipelines, resulting in a fragmented structure and cumbersome operation. Furthermore, it suffers from the following drawbacks: 1. Material leakage or secondary contamination is prone to occur during transfer, affecting the purity and safety of the essential oil; 2. Inconsistent heights and interfaces between different devices cause inconvenient connections, requiring frequent adjustments by operators and reducing production continuity and stability; 3. The lack of effective vacuum emulsification and homogenization measures leads to uneven dispersion of some essential oils, large microemulsion particle sizes, and insufficient encapsulation efficiency and stability of the subsequent spray-dried product; 4. Existing equipment typically lacks specific designs for feed additive characteristics, making the spray-dried particles prone to moisture absorption and clumping, affecting storage and mixing uniformity.

[0004] On the other hand, single essential oils, as antibiotic alternatives, also have significant drawbacks in livestock and poultry feed applications: poor stability: essential oils are mostly volatile substances, which are easily oxidized and evaporated under high-temperature granulation or long-term storage conditions, resulting in serious loss of active ingredients; limited effects: single essential oils often only target a certain type of pathogen or physiological function, with limited antibacterial and anti-stress effects, making it difficult to meet the comprehensive protection needs of large-scale farming; poor palatability: some essential oils have strong odors or are irritating, and direct addition to feed may affect poultry feed intake; low utilization rate: essential oils have low absorption rates in the animal digestive tract and are easily decomposed or metabolized in the upper gastrointestinal tract, making it difficult to exert a sustained and effective effect.

[0005] For example, Chinese Patent Publication No. CN110564508B discloses a compound essential oil, its preparation method, and its application in animal feed. This compound essential oil is composed of caraway essential oil, lemongrass essential oil, celery essential oil, and perilla leaf essential oil in a ratio of 4-6:1-2:3-5:2-4. Microcapsules containing 10% of the compound essential oil are prepared using a single coagulation method and added to animal feed at a ratio of 0.05-0.1%.

[0006] And Chinese Patent Publication No. CN115137017B discloses a plant essential oil feed additive and its application. This plant essential oil feed additive is composed of essential oil and excipients, and the different proportions of the components of the essential oil, thymol, cinnamaldehyde and carvacrol, are adjusted.

[0007] Therefore, finding alternative products to feed antibiotics as feed additives and designing related preparation devices and methods has significant practical implications for livestock and poultry farming. Summary of the Invention

[0008] This invention provides an apparatus, method, and essential oil for preparing microencapsulated compound essential oils. The apparatus connects a premixing mixer, a vacuum container, an emulsification component, a centrifugal pump, and a spray-drying granulator via a pipeline conveying device. The conveying pipe and mixing tank of the pipeline conveying device facilitate the transport, addition, and mixing of materials, thereby preparing the compound essential oil. Furthermore, the microencapsulated compound essential oil for animal feed provided by this invention is prepared by blending cinnamaldehyde, eugenol, thymol, carvacrol, and tea tree oil in a specific ratio. Compared to single essential oil additives, the synergistic addition of multiple natural essential oils to the feed results in a high-performance essential oil feed.

[0009] In a first aspect, the present invention provides a microcapsule-encapsulated composite essential oil preparation apparatus, which includes a premixing mixer, a vacuum container, an emulsification component, a centrifugal pump component, and a spray drying granulator. The premixing mixer and the vacuum container, the vacuum container and the emulsification component, the emulsification component and the centrifugal pump component, and the centrifugal pump component and the spray drying granulator are all connected by a pipeline conveying device. The pipeline conveying device includes a conveying device base, a conveying assembly, and a mixing tank assembly, which are mounted on the conveying device base. The conveying assembly includes a push rod rotating base, a hinge, a pipeline adjusting push rod, a pipeline push rod connector, and a conveying pipe. The push rod rotating base is located in the middle of the conveying device base. The hinge is rotatably connected to the push rod rotating base, and the top of the hinge is connected to the bottom of the pipeline adjusting push rod. The top of the telescopic rod of the pipeline adjusting push rod is rotatably connected to the pipeline push rod connector, and the inner wall of the pipeline push rod connector is connected to the outer surface of the conveying pipe. The mixing tank assembly includes a tank rotating seat, a tank rotating shaft connector, a tank body, a tank cover, a stirrer, a connecting ring, a connecting rod, and a tank angle adjusting push rod. The bottom of the tank rotating seat is connected to... The upper end face of the conveying device base is connected; the tank body rotating shaft connector is rotatably connected to the tank body rotating base; the top of the tank body is provided with lugs on both sides, the lower end face of the lugs is connected to the upper end face of the tank body rotating shaft connector; the bottom of the tank cover is slidably connected to the top of the tank body; the agitator is fixedly connected to the tank cover; the connecting ring is connected to the outer surface of the bottom end of the tank body; the first end of the connecting rod is rotatably connected to the connecting ring; the tank body angle adjusting push rod is rotatably connected to the second end of the connecting rod; a push rod adjusting frame is provided between the push rod rotating base and the conveying device base; a lifting assembly is provided below the conveying device base; the lifting assembly includes a lifting base plate, a linear push cylinder, and a guide rail; the linear push cylinder is provided on the first side of the upper end face of the lifting base plate, and the guide rail is provided on the second side of the upper end face of the lifting base plate.

[0010] Preferably, the extension and retraction direction of the tank angle adjusting push rod is parallel to the upper end face of the conveying device base. The tank angle adjusting push rod is connected to the conveying device base through a horizontal push rod fixing seat. The horizontal push rod fixing seat is L-shaped. The bottom surface of the tank angle adjusting push rod is connected to the vertical boss of the horizontal push rod fixing seat. The bottom of the horizontal push rod fixing seat is connected to the upper end face of the conveying device base. The tank is conical in shape. A feed inlet is located at the top of the first side of the tank, and a discharge outlet is located at the bottom of the second side of the tank. Both the feed inlet and the discharge outlet are provided with outwardly protruding troughs. The trough of the feed inlet is rotatably connected to the conveying pipe. The bottoms of the conveying pipe, the feed inlet trough, and the discharge outlet trough are all outwardly protruding arcs. A feeding port is provided on the tank cover, and an annular protrusion is provided at the bottom of the tank cover. The outer surface of the annular protrusion is slidably connected to the inner wall of the top of the tank.

[0011] Preferably, the agitator includes a stirring motor, a fixed flange, a coupling, a stirring rod, and stirring blades. The upper end face of the fixed flange is connected to the housing of the stirring motor. The top of the tank cover is provided with a stirring mounting hole. The stirring rod is placed in the stirring mounting hole, and the top end of the stirring rod is connected to the output shaft of the stirring motor through the coupling. The middle ring of the stirring blade is fitted around the bottom end of the stirring rod and is connected to the stirring rod by bolts. There are multiple sets of stirring blades, and the length of the multiple sets of stirring blades decreases sequentially from top to bottom.

[0012] A second aspect of the present invention provides a method for preparing a microcapsule-encapsulated composite essential oil based on the above-described microcapsule-encapsulated composite essential oil preparation device, comprising the following steps: S1. Preparation of essential oil premix: Take 15-20 parts by weight of cinnamaldehyde, 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol, 2-5 parts by weight of carvacrol and 2-5 parts by weight of tea tree essential oil and mix them in a premix mixer to obtain the essential oil premix. S2, Emulsification: Place the essential oil premix from step S1 and 35-40 parts of corn starch into a vacuum container, add 8-10 parts of emulsifier and 15-20 parts of purified water in sequence, and continue to pressurize for 1-3 minutes at a pressure range of 0.08-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification and homogenize for 15-20 minutes to obtain a microemulsion; S3. Centrifugal filtration: The microemulsion obtained in step S2 is placed in a centrifugal pump and filtered for 5-7 minutes to obtain the filtered microemulsion. S4. Microencapsulation: Cool the filtered microemulsion from step S3 to 60-65℃ and spray dry to granulate to obtain microencapsulated compound essential oil.

[0013] The present invention also provides a microcapsule-encapsulated composite essential oil prepared by the above preparation method, comprising, by mass percentage, 15-20% cinnamaldehyde, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 2%-5% tea tree oil, 35-40% corn starch, 15-20% purified water and 8-10% emulsifier.

[0014] Preferably, when the microencapsulated compound essential oil in the feed is mixed with the feed, the mixing ratio of the microencapsulated compound essential oil to the feed is 3-5:10000.

[0015] A third aspect of the present invention provides a method for preparing a microcapsule-encapsulated composite essential oil based on the above-described microcapsule-encapsulated composite essential oil preparation apparatus, comprising the following steps: S1. Preparation of essential oil premix: 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol, 2-5 parts by weight of carvacrol and 2-5 parts by weight of tea tree essential oil are mixed in a premix mixer to obtain essential oil premix. S2, Emulsification: Place the essential oil premix from step S1 and 45-50 parts of corn starch into a vacuum container, add 13-15 parts of emulsifier and 25-30 parts of purified water in sequence, and continue to pressurize for 1-2 minutes at a pressure range of 0.07-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification, homogenize for 15-20 minutes to obtain a microemulsion; S3. Centrifugal filtration: The microemulsion obtained in step S2 is placed in a centrifugal pump and filtered for 5-7 minutes to obtain the filtered microemulsion. S4. Microencapsulation: Cool the filtered microemulsion from step S3 to 60-65℃ and spray dry to granulate to obtain microencapsulated essential oils.

[0016] The present invention also provides a microcapsule-encapsulated essential oil prepared by the above preparation method, comprising, by mass percentage, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 2%-5% tea tree oil, 45-50% corn starch, 25-30% purified water and 13-15% emulsifier.

[0017] A fourth aspect of the present invention provides a method for preparing a microcapsule-encapsulated composite essential oil based on the above-described microcapsule-encapsulated composite essential oil preparation apparatus, comprising the following steps: S1. Preparation of essential oil premix: Take 15-20 parts by weight of cinnamaldehyde, 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol and 2-5 parts by weight of carvacrol and mix them in a premix mixer to obtain the essential oil premix. S2, Emulsification: Place the essential oil premix from step S1 and 35-40 parts of corn starch into a vacuum container, add 10-15 parts of emulsifier and 15-20 parts of purified water in sequence, and continue to pressurize for 1-2 minutes at a pressure range of 0.07-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification, homogenize for 15-20 minutes to obtain a microemulsion; S3. Centrifugal filtration: The microemulsion obtained in step S2 is placed in a centrifugal pump and filtered for 5-7 minutes to obtain the filtered microemulsion. S4. Microencapsulation: Cool the filtered microemulsion from step S3 to 60-65℃ and spray dry to granulate to obtain microencapsulated essential oils.

[0018] The present invention also provides a microcapsule-encapsulated essential oil prepared by the above preparation method, comprising, by mass percentage, 15-20% cinnamaldehyde, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 35-40% corn starch, 15-20% purified water and 10-15% emulsifier.

[0019] Compared with the prior art, the present invention has the following advantages: (1) The microcapsule-encapsulated composite essential oil preparation device provided by the present invention connects processing tools such as premixing mixer, vacuum container, emulsification component, centrifugal pump and spray drying granulator through pipeline conveying device. Through the conveying pipe and mixing tank of pipeline conveying device, the material is conveyed, added and mixed. The height and angle of the conveying pipe and mixing tank can be adjusted by using lifting component and pipeline adjustment push rod according to actual needs, so as to adapt to the height of the equipment connected on both sides of pipeline conveying device and ensure the flow of materials.

[0020] (2) The microcapsule-encapsulated compound essential oil for feed provided by the present invention is made by compounding cinnamaldehyde, eugenol, thymol, carvacrol and tea tree essential oil in a certain proportion. Compared with single essential oil additives, the addition of multiple natural essential oils to the feed can improve the production performance of ducks and reduce the feed-to-egg ratio.

[0021] (3) The microcapsule encapsulation method for preparing compound essential oil for feed provided by the present invention adopts microcapsule encapsulation technology to ensure the stability of essential oil and retention rate in feed, so that the retention rate of feed processing reaches 99%, reducing losses, and the loss rate at 120℃ high temperature and high pressure for 30 minutes is <2%.

[0022] (4) The microcapsule-encapsulated compound essential oil provided by the present invention can be added to feed to have antioxidant, stress reduction and promote the development of reproductive organs of ducks, thereby increasing the egg production rate and improving egg quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the connection structure between the pipeline conveying device and the emulsification component of the present invention; Figure 2 This is a schematic diagram of the connection structure between the pipeline conveying device and the centrifugal pump of the present invention; Figure 3 This is a schematic diagram of the pipeline conveying device structure when the mixing tank of the present invention rotates clockwise; Figure 4 This is a schematic diagram of the stirrer structure of the present invention.

[0024] The main reference numerals are as follows: 1. Conveying device base; 21. Push rod rotating base; 22. Hinge; 23. Pipe adjusting push rod; 24. Pipe push rod connector; 25. Conveying pipe; 31. Tank rotating seat; 32. Bearing; 33. Tank rotating shaft connector; 34. Tank; 341. Inlet; 342. Outlet; 35. Tank cover; 351. Feeding port; 36. Agitator; 361. Agitator motor; 362. Fixed flange; 363. Coupling; 364. Agitator rod 365. Stirring blades; 37. Connecting ring; 38. Connecting rod; 39. Tank angle adjustment push rod; 4. Horizontal push rod fixing seat; 5. Push rod adjusting frame; 6. Lifting assembly; 61. Lifting base plate; 62. Linear push cylinder; 63. Guide rail; 7. Emulsification assembly; 71. Emulsification tank base; 72. Emulsification tank; 73. Linear module; 74. Homogenizing emulsifier; 8. Centrifugal pump assembly; 81. Centrifugal pump; 82. Centrifugal pump motor; 83. Centrifugal pump coupling. Detailed Implementation

[0025] To provide a detailed description of the technical content, objectives, and effects of this invention, the following description will be provided in conjunction with the accompanying drawings.

[0026] like Figures 1 to 4 As shown, the present invention provides an apparatus for preparing microencapsulated compound essential oils for feed, which includes a premixing mixer, a vacuum container, an emulsification component, a centrifugal pump, a spray drying granulator, and a pipeline conveying device connected in sequence to the above-mentioned processing equipment. The pipeline conveying device includes a conveying device base 1, a conveying assembly, and a mixing tank assembly, both of which are mounted on the conveying device base 1. The conveying assembly includes a push rod rotating base 21, a hinge 22, a pipeline adjusting push rod 23, a pipeline push rod connector 24, and a conveying pipe 25. The push rod rotating base 21 is located at the middle position on one side of the upper end face of the conveying device base 1. The hinge 22 is rotatably connected to the push rod rotating base 21, and the top end face of the hinge 22 is connected to the bottom end face of the pipeline adjusting push rod 23. In one embodiment, the hinge 22 is a double-eared tail hinge. The top end of the telescopic rod of the pipeline adjusting push rod 23 is rotatably connected to the pipeline push rod connector 24, and the inner wall of the pipeline push rod connector 24 is connected to the outer surface of the conveying pipe 25. The mixing tank assembly includes a tank body rotating seat 31, a bearing 32, a tank body rotating shaft connector 33, a tank body 34, a tank cover 35, a stirrer 36, a connecting ring 37, a connecting rod 38, and a tank body angle adjustment mechanism. Push rod 39, the bottom end face of tank rotating seat 31 is connected to the upper end face of conveying device base 1, the top of the two side wing plates of tank rotating seat 31 is provided with bearing mounting holes, bearing 32 is installed in the bearing mounting holes, the outer side of tank rotating shaft connector 33 is provided with cylindrical rotating shaft, tank rotating shaft connector 33 is rotatably connected to tank rotating seat 31 through bearing 32, rectangular support ears are symmetrically provided on the front and rear sides of the top of tank 34, the lower end face of the support ear is connected to the upper end face of tank rotating shaft connector 33, the bottom end face of tank cover 35 is slidably connected to the top end face of tank 34, agitator 36 is fixedly connected to tank cover 35, connecting ring 37 is connected to the outer surface of the bottom end of tank 34 by welding or other means, the first end of connecting rod 38 is rotatably connected to connecting ring 37, tank angle adjusting push rod 39 is rotatably connected to the second end of connecting rod 38, the top of the extension rod of pipe adjusting push rod 23 and tank angle adjusting push rod 39 is provided with bearing.

[0027] The extension and retraction direction of the tank angle adjusting push rod 39 is parallel to the upper end face of the conveying device base 1. The main body of the tank angle adjusting push rod 39 is connected to the conveying device base 1 through the horizontal push rod fixing seat 4. The horizontal push rod fixing seat 4 is L-shaped. The bottom surface of the tank angle adjusting push rod 39 is connected to the second side of the vertical boss of the horizontal push rod fixing seat 4. The bottom end face of the horizontal push rod fixing seat 4 is connected to the upper end face of the conveying device base 1.

[0028] The stroke of push rod 23 can be adjusted according to the height of conveying pipe 25 and the pipe angle. A push rod adjustment bracket 5 is added between push rod rotating base 21 and conveying device base 1.

[0029] According to the height of the processing tools at both ends of the pipeline conveying device, a lifting assembly 6 can be added below the base 1 of the conveying device. The lifting assembly 6 includes a lifting base plate 61, a linear push cylinder 62 and a guide rail 63. The linear push cylinder 62 is located on the second side of the upper end face of the lifting base plate 61, and the guide rail 63 is symmetrically located on the first side of the upper end face of the lifting base plate 61. In one embodiment, the guide rail 63 is a cylindrical guide rail. In this embodiment, the first side generally refers to the left side and the second side refers to the right side.

[0030] The emulsification assembly 7 includes an emulsification tank base 71, an emulsification tank 72, a linear module 73, and a homogenizing emulsifier 74. The emulsification tank 72 and the linear module 73 are mounted on the emulsification tank base 71, and the homogenizing emulsifier 74 is mounted inside the emulsification tank 72. The homogenizing emulsifier 74 is driven to rise and fall by the linear module 73.

[0031] The centrifugal pump assembly 8 includes a centrifugal pump 81, a centrifugal pump motor 82, and a centrifugal pump coupling 83. The centrifugal pump 81 is driven by the centrifugal pump motor 82, and the blade shaft of the centrifugal pump 81 is connected to the output shaft of the centrifugal pump motor 82 through the centrifugal pump coupling 83.

[0032] The tank body 34 is conical in shape. A feed inlet 341 is provided at the top left side of the tank body 34, and a discharge outlet 342 is provided at the bottom right side of the tank body 34. Both the feed inlet 341 and the feed inlet 342 are provided with outwardly protruding material troughs. The material trough of the feed inlet 342 is rotatably connected to the second side of the conveying pipe 25. The bottom of the conveying pipe 25, the material trough of the feed inlet 341, and the material trough of the discharge outlet 342 are all outwardly protruding arc shapes.

[0033] The can lid 35 is provided with a feeding port 351, and the bottom of the can lid 35 is provided with an annular protrusion. The outer surface of the annular protrusion is slidably connected to the inner wall of the top of the can body 34.

[0034] The agitator 36 includes an agitator motor 361, a fixed flange 362, a coupling 363, an agitator rod 364, and agitator blades 365. The upper end face of the fixed flange 362 is connected to the housing of the agitator motor 361. The top end face of the tank cover 35 is provided with an agitator mounting hole. The agitator rod 364 is installed in the agitator mounting hole, and the top end of the agitator rod 364 is connected to the output shaft of the agitator motor 361 through the coupling 363. The middle ring of the agitator blade 365 is fitted around the bottom end of the agitator rod 364 and is connected to the agitator rod 364 by bolts. There is more than one set of agitator blades 365, and the length of each set of agitator blades decreases sequentially from top to bottom.

[0035] The present invention discloses a method for preparing microcapsule-encapsulated composite essential oil, comprising the following steps: S1. Preparation of essential oil premix: Take 15-20 parts by weight of cinnamaldehyde, 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol, 2-5 parts by weight of carvacrol and 2-5 parts by weight of tea tree essential oil and mix them in a premix mixer to obtain the essential oil premix.

[0036] S2. Emulsification: Place the essential oil premix from step S1 and 35-40 parts of corn starch into a vacuum container, add 8-10 parts of emulsifier and 15-20 parts of purified water in sequence, and pressurize continuously for 1-3 minutes at a pressure range of 0.08-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification, homogenize for 15-20 minutes to obtain a microemulsion.

[0037] S3. Centrifugal filtration: Place the microemulsion obtained in step S2 into a centrifugal pump and filter for 5-7 minutes to obtain the filtered microemulsion.

[0038] S4. Microencapsulation: The microemulsion filtered in step S3 is cooled to 60-65℃ and spray-dried to obtain a microencapsulated compound essential oil for feed. This compound essential oil comprises, by mass percentage: 15-20% cinnamaldehyde, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 2%-5% tea tree oil, 35-40% corn starch, 15-20% purified water, and 8-10% emulsifier. When mixing the microencapsulated compound essential oil with feed, the mixing ratio is 3-5:10000.

[0039] The present invention provides a method for preparing microcapsule-encapsulated essential oils, comprising the following steps: S1. Preparation of essential oil premix: Take 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol, 2-5 parts by weight of carvacrol and 2-5 parts by weight of tea tree essential oil and mix them in a premix mixer to obtain the essential oil premix.

[0040] S2. Emulsification: Place the essential oil premix from step S1 and 45-50 parts of corn starch into a vacuum container, add 13-15 parts of emulsifier and 25-30 parts of purified water in sequence, and pressurize continuously for 1-2 minutes at a pressure range of 0.07-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification, homogenize for 15-20 minutes to obtain a microemulsion.

[0041] S3. Centrifugal filtration: Place the microemulsion obtained in step S2 into a centrifugal pump and filter for 5-7 minutes to obtain the filtered microemulsion.

[0042] S4. Microencapsulation: Cool the filtered microemulsion from step S3 to 60-65°C and spray-dry it to obtain microencapsulated essential oils for feed. These oils include, by mass percentage, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 2%-5% tea tree oil, 45-50% corn starch, 25-30% purified water, and 13-15% emulsifier.

[0043] The present invention discloses a method for preparing microencapsulated essential oils for feed, comprising the following steps: S1. Preparation of essential oil premix: Take 15-20 parts by weight of cinnamaldehyde, 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol and 2-5 parts by weight of carvacrol and mix them in a premix mixer to obtain the essential oil premix.

[0044] S2. Emulsification: Place the essential oil premix from step S1 and 35-40 parts of corn starch into a vacuum container, add 10-15 parts of emulsifier and 15-20 parts of purified water in sequence, and pressurize continuously for 1-2 minutes at a pressure range of 0.07-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification, homogenize for 15-20 minutes to obtain a microemulsion.

[0045] S3. Centrifugal filtration: Place the microemulsion obtained in step S2 into a centrifugal pump and filter for 5-7 minutes to obtain the filtered microemulsion.

[0046] S4. Microencapsulation: The microemulsion filtered in step S3 is cooled to 60-65℃ and spray-dried to obtain microencapsulated essential oil for feed. It includes 15-20% cinnamaldehyde, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 35-40% corn starch, 15-20% purified water and 10-15% emulsifier by mass percentage.

[0047] Example 1: A microencapsulated compound essential oil for use in feed, the feed additive comprising the following components: 4% eugenol, 2% thymol, 4% carvacrol, 2% tea tree oil, 50% corn starch, 25% purified water and 13% emulsifier.

[0048] Preparation of microencapsulated compound essential oils for feed: S1. Preparation of essential oil mixture: Take 4 parts by weight of eugenol, 2 parts of thymol, 4 parts of carvacrol and 2 parts of tea tree essential oil and mix them in a premix mixer to obtain essential oil premix.

[0049] S2. Emulsification: Place the essential oil premix from step S1 and 50 parts of corn starch into a vacuum container, add 13 parts of emulsifier Tween-80 and 25 parts of purified water in sequence, and pressurize continuously for 1 minute at a pressure of 0.08 MPa to obtain a preliminary emulsion. Place the preliminary emulsion into a shear homogenizer for secondary emulsification. After homogenization for 20 minutes, a microemulsion is obtained.

[0050] S3. Centrifugal filtration: The microemulsion obtained in S2 is pumped into a centrifuge and filtered for 7 minutes to obtain the filtered microemulsion.

[0051] S4. Microencapsulation: The microemulsion filtered in S3 is cooled to 65°C and spray-dried to granulate, yielding microencapsulated essential oils for use in feed.

[0052] Microencapsulated essential oils for feed were added at 300 mg / kg to the basic feed of laying ducks, and the resulting mixed feed was designated as experimental group 1.

[0053] Example 2: A microencapsulated essential oil for feed, the feed additive comprising the following components: 20% cinnamaldehyde, 4% eugenol, 2% thymol, 4% carvacrol, 40% corn starch, 20% purified water and 10% emulsifier.

[0054] Preparation of microencapsulated essential oils for animal feed: S1. Preparation of essential oil mixture: Take 20 parts by weight of cinnamaldehyde, 4 parts by weight of eugenol, 2 parts by weight of thymol and 4 parts by weight of carvacrol and mix them in a premix mixer to obtain essential oil premix.

[0055] S2. Emulsification: Add the well-mixed essential oil premix and 40 parts corn starch to a vacuum container, add 10 parts Tween-80 emulsifier, and then add 20 parts purified water. Pressurize the container at 0.08 MPa for 1 minute to perform preliminary emulsification. Transfer the preliminary emulsion to a shear homogenizer for secondary emulsification for 20 minutes to obtain a microemulsion.

[0056] S3. Centrifugal filtration: The microemulsion obtained in S2 is pumped into a centrifuge and filtered for 7 minutes to obtain the filtered microemulsion.

[0057] S4. Microencapsulation: The microemulsion filtered in S3 is cooled to 65°C and spray-dried to granulate, yielding microencapsulated essential oils for use in feed.

[0058] Microencapsulated essential oils for use in feed were added at 300 mg / kg to the basic feed of laying ducks and thoroughly mixed. The resulting feed was designated as experimental group 2.

[0059] Example 3: A microencapsulated compound essential oil for use in feed, the feed additive comprising the following components: 20% cinnamaldehyde, 4% eugenol, 2% thymol, 4% carvacrol, 2% tea tree oil, 40% corn starch, 20% purified water, and 8% emulsifier Tween-80.

[0060] Preparation of microencapsulated compound essential oils for feed: S1. Take 20 parts by weight of cinnamaldehyde, 4 parts by weight of eugenol, 2 parts by weight of thymol, 4 parts by weight of carvacrol and 2 parts by weight of tea tree oil and mix them in a premix mixer to obtain an essential oil premix.

[0061] S2. Emulsification: Add the well-mixed essential oil mixture and 40 parts corn starch to a vacuum container, add 8 parts Tween-80, and then add 20 parts purified water. Pressurize the container at 0.08 MPa for 1 minute to perform preliminary emulsification. Transfer the preliminary emulsion to a shear homogenizer for secondary emulsification for 20 minutes to obtain a microemulsion.

[0062] S3. Centrifugal filtration: The microemulsion obtained in S2 is pumped into a centrifuge and filtered for 7 minutes to obtain the filtered microemulsion.

[0063] S4. Microencapsulation: The filtered microemulsion is cooled to 65°C and spray-dried to granulate, yielding microencapsulated compound essential oils for use in feed.

[0064] Microencapsulated compound essential oils for use in feed were added at 300 mg / kg to the basic feed of laying ducks and thoroughly mixed. The resulting feed was designated as experimental group 3.

[0065] Comparative Example 1: The additive-free feed was used as the control group 1.

[0066] Comparative Example 2: An essential oil additive, compared with microencapsulated compound essential oils used as feed, comprises 2% tea tree oil, 55% corn starch, 30% purified water and 13% Tween-80. The essential oil additive was added at 300 mg / kg to the basic feed of laying ducks and thoroughly mixed. The resulting feed was designated as control group 2.

[0067] Comparative Example 3: An essential oil additive, compared with microencapsulated compound essential oils used as feed, comprises 20% cinnamaldehyde, 45% corn starch, 24% purified water and 11% Tween-80. This essential oil additive was added at 300 mg / kg to the basic feed of laying ducks and thoroughly mixed. The resulting feed was designated as control group 3.

[0068] The following describes in further detail the microencapsulated compound essential oil for feed provided by the present invention, with reference to specific preferred embodiments: A trial was conducted on 336 420-day-old laying ducks using microencapsulated compound essential oils in their feed. The ducks were randomly divided into 6 groups, with 8 replicates per group and 7 ducks per replicate. Group 1 was the control group, fed a basal diet. Group 2 was the tea tree oil additive group, fed a basal diet supplemented with tea tree oil additives (Comparative Example 2). Group 3 was the cinnamaldehyde additive group, fed a basal diet supplemented with cinnamaldehyde additives (Comparative Example 3). Group 4 was the tea tree oil complex group, fed a basal diet supplemented with tea tree oil complexes (Example 1). Group 5 was the cinnamaldehyde complex group, fed a basal diet supplemented with cinnamaldehyde complexes (Example 2). Group 6 was the compound essential oil group, fed a basal diet supplemented with tea tree oil and cinnamaldehyde-encapsulated compound essential oils (Example 3). The pre-feeding period was 7 days, and the experimental period was 35 days. All experimental ducks were housed individually in cages, fed twice daily at 6:00 AM and 3:00 PM, with free access to food and water. Eggs were collected once before each feeding. All groups maintained the same rearing and management conditions, with natural ventilation. The immunization program followed the farm's standard procedures. The specific experimental design is shown in Table 1.

[0069] Table 1 Experimental Design group deal with Control group 1 Basic feed Control group 2 Basic feed + 300 mg / kg tea tree oil additive Control group 3 Basic feed + 300 mg / kg cinnamaldehyde additive Experimental group 1 Basic feed + 300 mg / kg tea tree oil complex Experimental group 2 Basic feed + 300 mg / kg cinnamaldehyde complex Experimental group 3 Basic feed + 300 mg / kg compound essential oil The experimental basal feed was a corn-soybean meal type. The metabolizable energy, crude protein and amino acid levels of the feed were designed according to the requirements. The composition and nutritional level of the basal feed are shown in Table 2.

[0070] Table 2. Composition and nutritional level of basic feed (air-dried base) project content raw material,% corn 48.0 flour 10.00 Soybean meal (crude protein 43%) 26.00 soybean oil 1.00 rapeseed meal 4.00 stone powder 9.00 Premix 1) ]] 2.00 total 100.00 Nutritional level 2) ]]> Metabolizable energy, MJ / kg 11.09 Crude protein, % 18.05 calcium,% 3.71 Total phosphorus, % 0.53 Lysine, % 1.00 Methionine, % 0.45 The premix provides the following per kilogram of feed: Vitamin A 12,000 IU, Vitamin D3 3,700 IU, Vitamin E 80 mg, Vitamin K 4 mg, Vitamin B1 4 mg, Vitamin B2 10 mg, Vitamin B6 8 mg, Vitamin B1 4 mg, Vitamin B2 10 mg, Vitamin B6 8 mg, Vitamin B2 10 ... 12 0.03 mg, niacin 80 mg, D-pantothenic acid 25 mg, biotin 0.40 mg, folic acid 3 mg, choline 1880 mg, sodium chloride 3500 g, iron 100 mg, copper 12 mg, manganese 120 mg, zinc 120 mg, iodine 1.2 mg, selenium 0.4 mg.

[0071] The specific steps for determining production performance are as follows: Daily statistics are collected for each replicate group, including feed intake, remaining feed, number of qualified eggs, weight of qualified eggs, and number of unqualified eggs (soft-shelled, deformed, cracked, and sandy-shelled eggs). The average daily feed intake, average weight of qualified eggs, qualified egg rate, and feed conversion ratio for each group are calculated. The formulas for calculating these indicators are as follows: Average daily feed intake = Total feed intake / Number of laying ducks / Number of days in the experiment Qualified egg production rate = Number of qualified eggs / (Number of laying ducks × Number of trial days) × 100 Qualified feed conversion ratio = Total feed intake / Qualified egg weight The experimental data processing and analysis methods are as follows: The variance was expressed as mean ± standard deviation. One-way ANOVA was performed using SPSS 26.0 software, and Duncan's multiple comparison test was used to test for differences between groups. A p-value < 0.05 was considered statistically significant.

[0072] Table 3. Effects of adding compound essential oils to feed on the production performance of laying ducks. project Control group 1 Control group 2 Control group 3 Experimental group 1 Experimental group 2 Experimental group 3 Qualified egg feed ratio 2.85 b ±0.24]]> 2.80 b ±0.19]]> 2.73 ab ±0.23]]> 2.63 ab ±0.25]]> 2.59 a ±0.16]]> 2.53 a ±0.18]]> Average daily feed intake / g 161.92±4.42 160.85±5.31 158.79±4.67 159.96±6.23 160.91±4.62 156.23±4.34 Qualified egg production rate / % 84.95 a ±8.07]]> 83.63 a ±4.87]]> 85.34 a ±3.49]]> 88.57 ab ±8.20]]> 90.20 b ±3.64]]> 91.91 b ±5.52 In Tables 3-11, data in the same row with no letter or containing the same letter indicates no significant difference, while different lowercase letters indicate significant difference.

[0073] As shown in Table 3, the feed conversion ratio and the ratio of qualified eggs in the experimental group were lower than those in the control group, with the experimental group 3 showing a significant reduction. This indicates that adding encapsulated essential oil to the basic feed can reduce the cost of raising ducks. Overall, adding encapsulated essential oil to the feed can increase the egg production rate and the rate of producing qualified eggs in ducks. Therefore, this invention can improve the production performance of ducks.

[0074] The effect of compound essential oil feed additives on the quality of duck eggs.

[0075] Methods for determining egg quality: Egg quality was measured weekly. Three duck eggs of near-average weight were randomly selected from each replicate. After cleaning the surface, the transverse and longitudinal diameters were measured using calipers; the eggshell color was measured using an eggshell color meter; the eggshell strength was measured using an eggshell strength meter; the albumen height was measured at three equidistant points between the yolk edge and the midline of the albumen edge using an albumen height meter, and the average value was taken to an accuracy of 0.01 mm; the yolk color was measured using a Roche colorimeter fan; the thickness of the eggshell at the blunt end, sharp end, and middle was measured using an eggshell thickness meter, and the average value was taken to an accuracy of 0.01 mm; the egg weight, eggshell weight, and yolk weight were accurately weighed using an electronic scale, accurate to 0.01 g; the egg shape index was calculated as longitudinal diameter / transverse diameter.

[0076] Table 4. Effects of adding compound essential oils to feed on the quality of duck eggs. project Control group 1 Control group 2 Control group 3 Experimental group 1 Experimental group 2 Experimental group 3 Egg weight / g 68.87±3.10 68.97±2.56 69.53±1.94 69.94±2.35 70.39±3.03 69.59±1.67 Egg-shaped index 1.32±0.03 1.32±0.03 1.33±0.02 1.34±0.03 1.33±0.02 1.34±0.03 Eggshell strength / N 36.79 a ±4.83]]> 37.52 a ±4.52 37.98 a ±5.67]]> 39.01 ab ±6.31]]> 42.50 b ±4.37]]> 42.99 b ±3.23]]> Eggshell thickness / mm 0.36 a ±0.01]]> 0.36 a ±0.04]]> 0.36 a ±0.06]]> 0.37 ab ±0.01]]> 0.38 b ±0.08]]> 0.38 b ±0.02]]> Egg yolk weight / g 22.80 a ±1.19]]> 23.51 a ±1.68 23.69 ab ±1.73]]> 24.28 b ±1.40]]> 24.67 b ±1.54]]> 25.09 b ±1.29]]> Egg yolk ratio / % 33.11 a ±1.01]]> 33.52 a ±1.22]]> 33.47 a ±0.98]]> 34.57 b ±0.97]]> 35.23 b + 1.58 36.05 b + 1.59 Egg yolk color (grade) 13.21±0.43 13.25±0.49 13.26±0.52 13.36±0.60 13.46±0.43 13.46±0.35 Concentrated protein height / mm 6.15 a ±0.27 6.21 a ±0.54]]> 6.33 a ±0.59]]> 6.63 ab ±0.68]]> 6.54 ab ±0.64]] 7.04 b ±0.27]]> Haas unit 74.59 a ±2.76]]> 74.96 a ±3.64]]> 75.13 a + 2.79 76.87 ab ±4.68]]> 76.80 ab ±5.55]]> 80.89 b ±1.92]]> Eggshell weight / g 7.05 a ±0.42]]> 7.11 a ±0.28 7.13 a ±0.36 7.58 b ±0.30 7.57 b ±0.27 7.60 b ±0.34 Shell weight percentage / % 10.23 a ±0.29 10.26 a ±0.34 10.29 a ±0.29 10.75 b ±0.39 10.62 b ±0.36 10.92 b ±0.44]]> Table 4 shows that compared with the control group, the eggshell strength of the experimental groups was increased, with experimental groups 2 and 3 showing significantly increased eggshell strength. The eggshell thickness of the cinnamaldehyde-encapsulated oil group and the tea tree oil and cinnamaldehyde-encapsulated compound oil group was significantly increased, indicating that adding compound essential oils to the feed can increase the stress resistance of duck eggs, reduce the breakage rate, and extend shelf life. The protein concentration and Haugh unit of the compound essential oil group were significantly higher than those of the control group, thus demonstrating that adding the compound essential oils of this invention to the feed can improve egg white quality and eggshell strength, which is beneficial for extending the shelf life of duck eggs and reducing the breakage rate during transportation.

[0077] Methods for determining antioxidant indicators: On day 35 of the experiment, one laying duck close to its average weight was randomly selected from each replicate. After fasting for 12 hours with free access to water, 10 mL of blood was collected from the wing vein. The serum was separated by centrifugation at 1000xg for 30 min and stored at -20 ℃ for later use. Antioxidant indicators such as superoxide dismutase, malondialdehyde, glutathione peroxidase, and total antioxidant capacity in the serum samples were detected using an ELISA kit.

[0078] Table 5. Effects of adding compound essential oils to feed on the antioxidant capacity of laying ducks. project Control group 1 Control group 2 Control group 3 Experimental group 1 Experimental group 2 Experimental group 3 Superoxide dismutase (SOD) / (U / mL) 85.97 ab ±7.83 88.17 ab ±10.00]]> 86.59 ab ±6.47]]> 82.54 a ±4.28]]> 90.88 bc ±8.25]]> 95.76 c ±5.20]]> Malondialdehyde (MDA) / (nmol / mL) 10.88 a ±0.83 10.73 a ±0.92]]> 10.71 a ±1.10]]> 10.24 a +0.89 10.37 a ±1.23]]> 9.47 b ±0.56]]> Glutathione peroxidase (GSH-PX) / (U / mL) 180.00±47.72 181.34±49.67 181.27±43.55 184.15±46.19 169.52±40.13 180.00±35.75 Total antioxidant capacity T-AOC / (mmol / L) 1.12±0.08 1.13±0.16 1.13±0.09 1.33±0.23 1.20±0.11 1.12±0.08 Table 5 shows that, compared with the control group, the superoxide dismutase content in experimental group 3 was significantly increased, while the malondialdehyde content in experimental group 3 was significantly decreased. This indicates that adding compound essential oils to the feed can promote the body's scavenging of free radicals, alleviate lipid peroxidation, and improve the antioxidant capacity of laying ducks.

[0079] At the end of the experiment, two experimental ducks close to their average weight were selected from each replicate. After fasting and weighing, they were slaughtered, and the ovaries and oviducts were removed and weighed. Oviduct length was measured, and the number of dominant follicles (diameter > 10 mm) and large yellow follicles (diameter > 20 mm) were recorded. The oviduct weight index, oviduct length index, ovarian weight index, and the percentage of large yellow follicles were calculated. The calculation formulas are as follows: Fallopian tube weight index (g / kg) = Fallopian tube weight / live weight Fallopian tube length index (cm / kg) = Fallopian tube length / live weight Ovarian weight index (g / kg) = ovarian weight / live weight Rhubarb follicle percentage % = (Number of rhubarb follicles / Number of dominant follicles) × 100 Table 6. Effects of adding compound essential oils to feed on the reproductive organs of laying ducks. project Control group 1 Control group 2 Control group 3 Experimental group 1 Experimental group 2 Experimental group 3 Live weight, kg 1.43±0.12 1.39±0.08 1.33±0.06 1.38±0.06 1.35±0.04 1.41±0.13 Fallopian tube length, cm 36.46±2.01 38.45±3.27 40.84±4.78 37.64±5.12 39.14±7.33 39.92±4.67 Fallopian tube length index, cm / kg 26.69±3.06 27.81±3.61 29.24±3.76 28.60±3.94 29.31±4.44 29.93±5.00 Fallopian tube weight, g 43.62 ± 3.22 a ]] 49.32 ± 5.20 a ]] 50.25 ± 5.27 a ]]> 49.85 ± 4.56 a ]]> 47.80 ± 4.97 a ]] 53.87 ± 6.09 b ]]> Fallopian tube weight index, g / kg 30.76 ± 3.34 a ]] 35.02 ± 3.23 b ]] 36.81 ± 3.75 b ]] 34.31 ± 2.79 b ]] 32.48 ± 3.80 b ]] 38.48 ± 5.28 b ]] Ovarian weight, g 49.26 ± 6.08 a ]] <![CDATA[50.86±6.52 a ]]> <![CDATA[52.64±8.38 a ]]> <![CDATA[50.82±8.41 a ]]> <![CDATA[60.13±9.78 b ]]> <![CDATA[60.35±9.11 b ]]> Ovarian weight index, g / kg <![CDATA[34.02±4.83 a ]]> <![CDATA[40.70±4.61 a ]]> <![CDATA[41.53±5.03 a ]]> <![CDATA[39.27±4.80 a ]]> <![CDATA[40.69±3.95 a ]]> <![CDATA[44.07±6.62 b ]]> Percentage of follicles in rhubarb, % <![CDATA[60.83±2.36 a ]]> <![CDATA[63.49±6.61 a ]]> <![CDATA[64.90±7.06 a ]]> <![CDATA[63.57±6.41 a ]]> <![CDATA[63.71±7.82 a ]]> <![CDATA[69.17±8.07 b ]]> Number of dominant follicles 4.75±0.71 4.60±0.46 4.96±1.54 4.17±1.86 4.87±1.86 5.25±0.89 As shown in Table 6, compared with the control group, the oviduct weight, ovarian weight, ovarian weight index and the proportion of large yellow follicles in experimental group 3 were significantly increased, indicating that adding compound essential oil to the feed can improve the development of reproductive organs in laying ducks and increase the egg production rate.

[0080] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for preparing microcapsule-encapsulated composite essential oils, characterized in that, It includes a premixing mixer, a vacuum container, an emulsification component, a centrifugal pump component, and a spray drying granulator. The premixing mixer is connected to the vacuum container, the vacuum container is connected to the emulsification component, the emulsification component is connected to the centrifugal pump component, and the centrifugal pump component is connected to the spray drying granulator via pipelines. The pipeline conveying device includes a conveying device base, a conveying assembly, and a mixing tank assembly, which are mounted on the conveying device base. The conveying assembly includes a push rod rotating base, a hinge, a pipeline adjusting push rod, a pipeline push rod connector, and a conveying pipe. The push rod rotating base is located in the middle of the conveying device base. The hinge is rotatably connected to the push rod rotating base, and the top of the hinge is connected to the bottom of the pipeline adjusting push rod. The top of the telescopic rod of the pipeline adjusting push rod is rotatably connected to the pipeline push rod connector, and the inner wall of the pipeline push rod connector is connected to the outer surface of the conveying pipe. The mixing tank assembly includes a tank rotating seat, a tank rotating shaft connector, a tank body, a tank cover, a stirrer, a connecting ring, a connecting rod, and a tank angle adjusting push rod. The bottom of the tank rotating seat is connected to... The upper end face of the conveying device base is connected; the tank body rotating shaft connector is rotatably connected to the tank body rotating base; the top of the tank body is provided with lugs on both sides, the lower end face of the lugs is connected to the upper end face of the tank body rotating shaft connector; the bottom of the tank cover is slidably connected to the top of the tank body; the agitator is fixedly connected to the tank cover; the connecting ring is connected to the outer surface of the bottom end of the tank body; the first end of the connecting rod is rotatably connected to the connecting ring; the tank body angle adjusting push rod is rotatably connected to the second end of the connecting rod; a push rod adjusting frame is provided between the push rod rotating base and the conveying device base; a lifting assembly is provided below the conveying device base; the lifting assembly includes a lifting base plate, a linear push cylinder, and a guide rail; the linear push cylinder is provided on the first side of the upper end face of the lifting base plate, and the guide rail is provided on the second side of the upper end face of the lifting base plate.

2. The microcapsule-encapsulated composite essential oil preparation apparatus according to claim 1, characterized in that, The extension and retraction direction of the tank angle adjustment push rod is parallel to the upper end face of the conveying device base. The tank angle adjustment push rod is connected to the conveying device base through a horizontal push rod fixing seat. The horizontal push rod fixing seat is L-shaped. The bottom surface of the tank angle adjustment push rod is connected to the vertical boss of the horizontal push rod fixing seat. The bottom of the horizontal push rod fixing seat is connected to the upper end face of the conveying device base. The tank is conical in shape. A feed inlet is located at the top of the first side of the tank, and a discharge outlet is located at the bottom of the second side of the tank. Both the feed inlet and the discharge outlet are provided with outwardly protruding troughs. The trough of the feed inlet is rotatably connected to the conveying pipe. The bottoms of the conveying pipe, the feed inlet trough, and the discharge outlet trough are all outwardly protruding arcs. A feeding port is provided on the tank cover, and an annular protrusion is provided at the bottom of the tank cover. The outer surface of the annular protrusion is slidably connected to the inner wall of the top of the tank.

3. The microcapsule-encapsulated composite essential oil preparation apparatus according to claim 1, characterized in that, The agitator includes a stirring motor, a fixed flange, a coupling, a stirring rod, and stirring blades. The upper end face of the fixed flange is connected to the housing of the stirring motor. The top of the tank cover is provided with a stirring mounting hole. The stirring rod is placed in the stirring mounting hole, and the top end of the stirring rod is connected to the output shaft of the stirring motor through the coupling. The middle ring of the stirring blade is fitted around the bottom end of the stirring rod and is connected to the stirring rod by bolts. There are multiple sets of stirring blades, and the length of the multiple sets of stirring blades decreases sequentially from top to bottom.

4. A method for preparing a microcapsule-encapsulated composite essential oil based on the microcapsule preparation apparatus according to any one of claims 1 to 3, characterized in that, It includes the following steps: S1. Preparation of essential oil premix: Take 15-20 parts by weight of cinnamaldehyde, 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol, 2-5 parts by weight of carvacrol and 2-5 parts by weight of tea tree essential oil and mix them in a premix mixer to obtain the essential oil premix. S2, Emulsification: Place the essential oil premix from step S1 and 35-40 parts of corn starch into a vacuum container, add 8-10 parts of emulsifier and 15-20 parts of purified water in sequence, and continue to pressurize for 1-3 minutes at a pressure range of 0.08-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification and homogenize for 15-20 minutes to obtain a microemulsion; S3. Centrifugal filtration: The microemulsion obtained in step S2 is placed in a centrifugal pump and filtered for 5-7 minutes to obtain the filtered microemulsion. S4. Microencapsulation: Cool the filtered microemulsion from step S3 to 60-65℃ and spray dry to granulate to obtain microencapsulated compound essential oil.

5. A microcapsule-encapsulated composite essential oil prepared by the preparation method using the microcapsule-encapsulated composite essential oil preparation apparatus of claim 4, characterized in that, It includes, by weight percentage, 15-20% cinnamaldehyde, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 2%-5% tea tree oil, 35-40% corn starch, 15-20% purified water, and 8-10% emulsifier.

6. The microcapsule-encapsulated composite essential oil prepared by the preparation method of the microcapsule-encapsulated composite essential oil preparation device according to claim 5, characterized in that, The mixing ratio of microencapsulated compound essential oils with feed is 3-5:10000.

7. A method for preparing a microcapsule-encapsulated composite essential oil based on the microcapsule-encapsulated composite essential oil preparation device according to claim 1, characterized in that, It includes the following steps: S1. Preparation of essential oil premix: 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol, 2-5 parts by weight of carvacrol and 2-5 parts by weight of tea tree essential oil are mixed in a premix mixer to obtain essential oil premix. S2, Emulsification: Place the essential oil premix from step S1 and 45-50 parts of corn starch into a vacuum container, add 13-15 parts of emulsifier and 25-30 parts of purified water in sequence, and continue to pressurize for 1-2 minutes at a pressure range of 0.07-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification, homogenize for 15-20 minutes to obtain a microemulsion; S3. Centrifugal filtration: The microemulsion obtained in step S2 is placed in a centrifugal pump and filtered for 5-7 minutes to obtain the filtered microemulsion. S4. Microencapsulation: Cool the filtered microemulsion from step S3 to 60-65℃ and spray dry to granulate to obtain microencapsulated essential oils.

8. A microcapsule-encapsulated essential oil prepared by the preparation method using the microcapsule-encapsulated composite essential oil preparation apparatus of claim 7, characterized in that, It includes, by weight percentage, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 2%-5% tea tree oil, 45-50% corn starch, 25-30% purified water, and 13-15% emulsifier.

9. A method for preparing a microcapsule-encapsulated composite essential oil based on the microcapsule preparation apparatus according to any one of claims 1 to 3, characterized in that, It includes the following steps: S1. Preparation of essential oil premix: Take 15-20 parts by weight of cinnamaldehyde, 2-5 parts by weight of eugenol, 2-5 parts by weight of thymol and 2-5 parts by weight of carvacrol and mix them in a premix mixer to obtain the essential oil premix. S2, Emulsification: Place the essential oil premix from step S1 and 35-40 parts of corn starch into a vacuum container, add 10-15 parts of emulsifier and 15-20 parts of purified water in sequence, and continue to pressurize for 1-2 minutes at a pressure range of 0.07-0.1 MPa to obtain a preliminary emulsion; place the preliminary emulsion into a shear homogenizer for secondary emulsification, homogenize for 15-20 minutes to obtain a microemulsion; S3. Centrifugal filtration: The microemulsion obtained in step S2 is placed in a centrifugal pump and filtered for 5-7 minutes to obtain the filtered microemulsion. S4. Microencapsulation: Cool the filtered microemulsion from step S3 to 60-65℃ and spray dry to granulate to obtain microencapsulated essential oils.

10. A microcapsule-encapsulated essential oil prepared by the preparation method using the microcapsule-encapsulated composite essential oil preparation apparatus of claim 9, characterized in that, It includes 15-20% cinnamaldehyde, 2%-5% eugenol, 2%-5% thymol, 2%-5% carvacrol, 35-40% corn starch, 15-20% purified water, and 10-15% emulsifier by weight percentage.

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