A double-helix stirred reactor for producing high-viscosity silicone oil

Abstract

The present invention discloses a twin-helix stirred reactor for producing high-viscosity silicone oil. The reactor comprises a reactor body with a main stirring rod mounted via an electric motor; a lower fixed plate and an upper fixed plate fixed to the upper portion of the reactor body via the main stirring rod; a driving gear mounted on the lower fixed plate through the main stirring rod; transmission gears 1, 2, and 3 mounted on the driving gear; left-hand and right-hand stirring hooks pass through the lower and upper fixed plates, respectively, and are secured to the lower fixed plate via ball bearings 1, 2, and 3, respectively. The reactor is suitable for producing high-viscosity dimethyl silicone oil, vinyl silicone oil, amino silicone oil, hydroxyl silicone oil, and other modified silicone oils with a viscosity of 500,000 to 20 million cP. The twin-helix stirred reactor and process for producing high-viscosity silicone oil utilizes 10-30% lower current than conventional ribbon stirring methods; achieves superior stirring performance, and reduces polymerization equilibrium time by 60-80%.

Description

Technical Field

[0001] The invention relates to the field of equipment and a production process for high-viscosity silicone oil production, in particular to a double-helix stirring reactor and a process for high-viscosity silicone oil production. Background Art

[0002] Silicone oil is a type of organosilicon product. Silicone oil generally refers to linear polysiloxane products that remain liquid at room temperature. It is generally divided into two categories: methyl silicone oil and modified silicone oil. High-viscosity silicone oil generally refers to silicone oil with a higher molecular weight and a viscosity above 5000 cP. It is commonly used in precision machinery and instrumentation as a shockproof and damping material, and in cosmetics in the daily chemical industry. Therefore, the demand for high-viscosity silicone oil is very widespread. However, the current production of high-viscosity silicone oil still uses a single-ribbon stirred reactor. This reactor is suitable for the preparation of medium- and high-viscosity silicone oils. The preparation of high- and ultra-high-viscosity silicone oils has disadvantages such as difficulty in stirring, uneven material mixing, long time consumption, and high energy consumption. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention provides a double-helix stirred reactor and process for producing high-viscosity silicone oil, which solves the problems of large stirring current, long stirring time and uneven stirring and dispersion in the existing preparation of high-viscosity silicone oil.

[0004] In order to solve the above problems, the present invention is implemented by the following technical solutions: a double-helix stirred reactor for producing high-viscosity silicone oil, the stirred reactor comprising a reactor body, a main stirring rod is provided in the reactor body via an electric motor;

[0005] The upper part of the kettle body is fixed with a lower fixed plate and an upper fixed plate via the main stirring rod;

[0006] The lower fixed plate is provided with a driving gear through the main stirring rod, and the driving gear is provided with a transmission gear 1, a transmission gear 2, and a transmission gear 3;

[0007] The tops of the left spiral stirring hook and the right spiral stirring hook pass through the lower fixed plate and the upper fixed plate, and the left spiral stirring hook, the right spiral stirring hook and the transmission gear 1 are respectively clamped on the lower fixed plate through ball bearing 1, ball bearing 2 and ball bearing 3.

[0008] The bottom of the main stirring rod is connected to the first rotating scraper and the second rotating scraper surrounding the kettle wall, and the material is 304 stainless steel.

[0009] The outer sides of the first rotary scraper and the second rotary scraper are close to the kettle wall, with a gap of 2 mm from the kettle wall.

[0010] The first rotating scraper and the second rotating scraper are arranged at an angle of 20 to 30 degrees in the opposite direction of the rotation tangent of the main stirring rod.

[0011] The left spiral stirring hook and the right spiral stirring hook have opposite top-down rotation directions and spiral directions.

[0012] The left-hand spiral stirring hook rotates clockwise from top to bottom, and the direction of the spiral is counterclockwise; the right-hand spiral stirring hook rotates counterclockwise from top to bottom, and the direction of the spiral is clockwise; or, the left-hand spiral stirring hook rotates counterclockwise from top to bottom, and the direction of the spiral is clockwise; the right-hand spiral stirring hook rotates clockwise from top to bottom, and the direction of the spiral is counterclockwise.

[0013] The left-hand spiral stirring hook and the right-hand spiral stirring hook satisfy tan22.5°≤D / (H / 2)≤tan45°, where D is the diameter of the spiral and H is the lead or pitch of the spiral line.

[0014] The specifications of the driving gear are the same as those of the transmission gear 1 and the transmission gear 2 (1 module has 16 teeth), but different from those of the transmission gear (1 module has 30 teeth). This makes the speed ratio of the transmission gear 2 and the transmission gear 3 1.875:1, which results in a speed ratio of 1.875:1 between the left spiral stirring hook and the right spiral stirring hook.

[0015] The kettle body is heated by heat transfer oil.

[0016] The kettle body is also provided with a DMC feed port, a capping agent feed port, a catalyst feed port, a vacuum port, a nitrogen port 1, a nitrogen port 2 and a discharge port.

[0017] The present invention provides a double-helix stirred reactor and process for producing high-viscosity silicone oil. It has the following beneficial effects:

[0018] 1. This equipment is a double-helix stirring reactor for the production of high-viscosity silicone oil. It has a hook-shaped stirring bottom and an overall spiral structure. It is also equipped with a specific angle rotating scraper and a double stirring structure, which enables the material to be three-dimensionally dislocated and efficiently dispersed and mixed. The stirring effect is better than that of conventional spiral ribbon stirring. When producing high-viscosity silicone oil and silica gel, the polymerization equilibrium time is shortened by 60-80%.

[0019] 2. The equipment is equipped with a special angle rotating scraper and a hook-shaped bottom and overall spiral structure stirring structure. The material resistance during stirring is greatly reduced, and the operating current is 10-30% lower than that of conventional screw ribbon stirring, enabling it to produce high viscosity dimethyl silicone oil, vinyl silicone oil, amino silicone oil, hydroxy silicone oil, and other modified silicone oils with a capacity of 500,000 to 20 million cP. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the device of the present invention.

[0021] In the figure: 1. kettle body; 2. thermal oil heating layer; 3. motor; 4. main stirring rod; 5-1. first rotating scraper; 5-2. second rotating scraper; 6. driving gear; 7-1. transmission gear 1; 7-2. transmission gear 2; 7-3. transmission gear 3; 8-1. left spiral stirring hook; 8-2. right spiral stirring hook; 9-1. ball bearing 1; 9-2. ball bearing 2; 9-3. ball bearing 3; 10-1. lower fixed plate; 10-2. upper fixed plate; 11. DMC feed port; 12. end-capping agent feed port; 13. catalyst feed port; 14. vacuum port; 15. nitrogen port 1; 16. nitrogen port 2; 17. discharge port. DETAILED DESCRIPTION

[0022] Example 1

[0023] A double-helix stirred reactor for producing high-viscosity silicone oil includes a reactor body 1 with a heat-conducting oil heating layer 2 outside the reactor body 1. The reactor body 1 is also provided with a DMC feed port 11, a capping agent feed port 12, a catalyst feed port 13, a vacuum port 14, a nitrogen port 1 15, a nitrogen port 2 16, and a discharge port 17.

[0024] A main stirring rod 4 is provided in the kettle body 1 via the motor 3; a lower fixing plate 10-1 and an upper fixing plate 10-2 are fixedly provided on the upper part of the kettle body 1 via the main stirring rod 4;

[0025] The lower fixed plate 10-1 is provided with a driving gear 6 through the main stirring rod 4, and the driving gear 6 is provided with a transmission gear 1 7-1, a transmission gear 2 7-2, and a transmission gear 3 7-3;

[0026] The tops of the left and right spiral stirring hooks 8-1 and 8-2 pass through the lower and upper fixing plates 10-1 and 10-2, respectively, securing the left and right spiral stirring hooks 8-1 and 8-2, and the transmission gear 7-1, to the lower fixing plate 10-1 via ball bearings 1, 2, 3, and 3, 9-1. The lower and upper fixing plates 10-1 and 10-2 are elongated strips of a defined width, not separating the upper and lower spaces within the kettle.

[0027] The bottom of the main stirring rod 4 is connected to a first rotating scraper 5-1 and a second rotating scraper 5-2 surrounding the kettle wall.

[0028] The outer sides of the first rotary scraper 5 - 1 and the second rotary scraper 5 - 2 are close to the kettle wall, with a gap of 2 mm from the kettle wall.

[0029] The first rotary scraper 5 - 1 and the second rotary scraper 5 - 2 have an angle of 25° in the opposite direction to the rotation tangent of the main stirring rod 4 .

[0030] The left spiral stirring hook 8 - 1 and the right spiral stirring hook 8 - 2 have opposite rotation directions from top to bottom and opposite spiral directions.

[0031] The left spiral stirring hook 8-1 rotates clockwise from top to bottom, and the spiral direction is counterclockwise; then the right spiral stirring hook 8-2 rotates counterclockwise from top to bottom, and the spiral direction is clockwise; or, the left spiral stirring hook 8-1 rotates counterclockwise from top to bottom, and the spiral direction is clockwise; then the right spiral stirring hook 8-2 rotates clockwise from top to bottom, and the spiral direction is counterclockwise.

[0032] The left-handed and right-handed spiral stirring hooks 8-1 and 8-2 satisfy the equation D / (H / 2) = tan 33.75°, where D is the diameter of the spiral and H is the lead or pitch of the spiral. By adopting this technical solution, materials near the two axes can move in two different ways during stirring and rotation: one is to squeeze and mix materials in the center before dispersing them to the sides; the other is to squeeze and mix materials downward along the spiral before dispersing them upward, thus improving the mixing and dispersion effect.

[0033] The driving gear 6 has the same specifications as the transmission gear 1 7-1 and the transmission gear 2 7-2 (1 module 16 teeth), and is different from the specifications of the transmission gear 3 7-3 (1 module 30 teeth), so that the transmission gear 2 7-2 and the transmission gear 3 7-3 form a speed ratio of 1.875:1, resulting in a speed ratio of 1.875:1 between the left spiral stirring hook 8-1 and the right spiral stirring hook 8-2.

[0034] By adopting the above technical solution, during stirring, firstly, the regular repetitive movement of the material is broken, and secondly, shear force can be generated, so that the material is stirred and mixed more fully.

[0035] Preferably, in this embodiment, the stirring bottoms of the left-hand spiral stirring hook 8-1 and the right-hand spiral stirring hook 8-2 are hook-shaped.

[0036] By adopting the above technical solution, more high-viscosity materials can be attached, so that the mixing efficiency of the materials at the bottom of the kettle is high and dead materials are not easily formed.

[0037] In this embodiment, preferably, the first rotating scraper 5-1 and the second rotating scraper are made of 304 stainless steel. The outer side of the rotating scraper is close to the kettle wall, with a gap of 2 mm from the kettle wall, and the angle between the scraper and the opposite direction of the rotating tangent is 25°.

[0038] By adopting the above technical solution, the first rotating scraper 5-1 and the second rotating scraper 5-2 guide the material in the area with poor fluidity on the kettle wall to the vicinity of the double-helix stirring, thereby preventing the formation of dead material in the kettle that does not participate in mixing.

[0039] In summary, when the motor 3 is running, it drives the main stirring rod 4 to rotate clockwise, the driving gear 6 connected to the main stirring rod drives the transmission gear 1 7-1 and the transmission gear 3 7-3 to rotate counterclockwise, the transmission gear 1 7-1 drives the transmission gear 2 7-2 to rotate clockwise, and the transmission gear 2 7-2 and the transmission gear 3 7-3 respectively drive the left spiral stirring hook 8-1 to rotate clockwise and the right spiral stirring hook 8-2 to rotate counterclockwise. The left-hand and right-hand spiral stirring hooks 8-1 and 8-2 drive the material in the kettle toward the center, mixing it with the surrounding materials during the process. The materials between the left-hand and right-hand spiral stirring hooks 8-1 and 8-2 are squeezed and mixed. Due to the size difference between transmission gear 2 7-2 and transmission gear 3 7-3, the left-hand and right-hand spiral stirring hooks 8-1 and 8-2 have a rotational speed ratio of 1.875:1, creating shear force between the materials and improving mixing efficiency. Furthermore, clockwise rotation of the left-hand spiral stirring hook and counterclockwise rotation of the right-hand spiral stirring hook both drive and squeeze the material downward. During this downward squeezing process, other materials move upward, enhancing the mixing effect of the upper and lower layers. Rotating scrapers are attached to the bottom of the main drive shaft of the double-helix stirring reactor for high-viscosity silicone oil production. The first and second rotating scrapers 5-1 and 5-2 are made of 304 stainless steel. The outer sides of the scrapers are close to the kettle wall, with a gap of 2 mm from the wall. The scrapers form an angle of 20 to 30 degrees in the opposite direction of the rotation tangent. As the main shaft rotates clockwise, the scraper blade follows, scraping material close to the kettle wall and drawing it into the center of the kettle, where it participates in the mixing of the double-helix stirring hooks. This prevents dead material from remaining on the kettle wall and not participating in the reaction. The hook-shaped bottoms of the left-hand and right-hand stirring hooks 8-1 and 8-2 attract more high-viscosity materials, ensuring efficient mixing of materials at the bottom of the kettle and preventing the formation of dead material.

[0040] Example 2

[0041] The device of Example 1 is used, and a three-phase variable frequency motor is used, with a rated voltage of 380 and a rated power of 75kW, to move the 6m 3 Into a double-helix stirred kettle, 4500 kg of dehydrated DMC was charged, and 1.71 kg of methyl-terminated siloxane oligomer was added. Stirring was started, and the material temperature was raised to 90°C using thermal oil. Tetramethylammonium hydroxide was added at 10 ppm based on the total amount of the raw material. Stirring was continued for 1 hour to obtain a dimethylsiloxane polymer. The current value and viscosity were recorded, and the time required for the polymer to reach the reaction equilibrium point (conversion rate and viscosity were stable and did not increase) was recorded.

[0042] Example 3

[0043] The operating steps were the same as those in Example 2, except that the 1.71 kg of methyl-terminated siloxane oligomer in Example 2 was adjusted to 3.15 kg of methyl-terminated siloxane oligomer.

[0044] Example 4

[0045] The operating steps were the same as those in Example 2, except that the 1.71 kg of methyl-terminated siloxane oligomer in Example 2 was adjusted to 2.25 kg of methyl-terminated siloxane oligomer.

[0046] Comparative Example 2A

[0047] The operation steps are the same as those in Example 2, except that the stirring structure in Example 1 is replaced with a common ribbon stirring structure with specifications of BSO---M4--5LD.

[0048] Comparative Example 3A

[0049] The operation steps are the same as those in Example 3, except that the overall stirring structure in Example 1 is replaced with a common spiral ribbon stirring structure with specifications of BSO---M4--5LD.

[0050] Comparative Example 4A

[0051] The operation steps are the same as those in Example 4, except that the overall stirring structure in Example 1 is replaced with a common spiral ribbon stirring structure with specifications of BSO---M4--5LD.

[0052] The results of Examples 2 to 4 and Comparative Examples 2A to 4A are shown in Table 1.

[0053] Table 1 Summary of results of Examples 2 to 4 and Comparative Examples 2A to 4A

[0054]

[0055] Note: If the current in Table 1 is greater than 150A, it means that the current is too large and the motor is stuck and cannot operate normally.

[0056] Example 5

[0057] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotation tangent in the opposite direction of Example 1 is adjusted to 20°.

[0058] Example 6

[0059] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotating tangent in the opposite direction of Example 1 is adjusted to 22.5°.

[0060] Example 7

[0061] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotating tangent in the opposite direction of Example 1 is adjusted to 27.5°.

[0062] Example 8

[0063] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotation tangent in the opposite direction of Example 1 is adjusted to 30°.

[0064] Comparative Example 2B

[0065] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 in Example 1 and the reverse direction of the rotary tangent is adjusted to 5°.

[0066] Comparative Example 2C

[0067] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotation tangent in the opposite direction of Example 1 is adjusted to 10°.

[0068] Comparative Example 2D

[0069] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 in Example 1 and the reverse direction of the rotary tangent is adjusted to 15°.

[0070] Comparative Example 2E

[0071] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotating tangent in the opposite direction of Example 1 is adjusted to 35°.

[0072] Comparative Example 2F

[0073] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotation tangent in the opposite direction of Example 1 is adjusted to 40°.

[0074] Comparative Example 2G

[0075] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotation tangent in the opposite direction of Example 1 is adjusted to 60°.

[0076] Comparative Example 2H

[0077] The operation steps are the same as those in Example 2, except that the angle between the first rotary scraper 5-1 and the second rotary scraper 5-2 and the rotating tangent in the opposite direction of Example 1 is adjusted to 90°.

[0078] The results of Examples 2, 5 to 8 and Comparative Examples 2B to 2H are shown in Table 2.

[0079] Table 2 Summary of results of Examples 2, 5 to 8 and Comparative Examples 2B to H

[0080]

[0081]

[0082] Note: If the current in Table 2 is greater than 150A, it means that the current is too large and the motor is stuck and cannot operate normally.

[0083] Comparative Example 2I

[0084] The operation steps are the same as those in Example 2, except that the specification of the transmission gear 3 7-3 in Example 1 is adjusted to 1 die 20 teeth.

[0085] Comparative Example 2J

[0086] The operation steps are the same as those in Example 2, except that the specifications of the transmission gear 7-3 in Example 1 are adjusted to 1 die 22 teeth.

[0087] Comparative Example 2K

[0088] The operation steps are the same as those in Example 2, except that the specifications of the transmission gear 7-3 in Example 1 are adjusted to 1 die 24 teeth.

[0089] Comparative Example 2L

[0090] The operation steps are the same as those in Example 2, except that the specifications of the transmission gear 7-3 in Example 1 are adjusted to 1 die 26 teeth.

[0091] Comparative Example 2M

[0092] The operation steps are the same as those in Example 2, except that the specification of the transmission gear 3 7-3 in Example 1 is adjusted to 1 die 28 teeth.

[0093] Comparative Example 2N

[0094] The operation steps are the same as those in Example 2, except that the specifications of the transmission gear 7-3 in Example 1 are adjusted to 1 die 32 teeth.

[0095] Comparative Example 20

[0096] The operation steps are the same as those in Example 2, except that the specifications of the transmission gear 7-3 in Example 1 are adjusted to 1 die 34 teeth.

[0097] Comparative Example 2P

[0098] The operation steps are the same as those in Example 2, except that the specifications of the transmission gear 3 7-3 in Example 1 are adjusted to 1 die 36 teeth.

[0099] Comparative Example 2Q

[0100] The operation steps are the same as those in Example 2, except that the specification of the transmission gear 3 7-3 in Example 1 is adjusted to 1 die 38 teeth.

[0101] Comparative Example 2R

[0102] The operation steps are the same as those in Example 2, except that the specification of the transmission gear 7-3 in Example 1 is adjusted to 1 die 40 teeth.

[0103] The results of Example 2 and Comparative Examples 2I to 2R are shown in Table 3.

[0104] Table 3 Summary of results of Example 2 and Comparative Example 2I~R

[0105]

[0106] Example 9

[0107] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan 22.5°.

[0108] Example 10

[0109] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan25°.

[0110] Example 11

[0111] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan30°.

[0112] Example 12

[0113] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan35°.

[0114] Example 13

[0115] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan40°.

[0116] Example 14

[0117] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan45°.

[0118] Comparative Example 2S

[0119] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan15°.

[0120] Comparative Example 2T

[0121] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan20°.

[0122] Comparative Example 2U

[0123] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan50°.

[0124] Comparative Example 2V

[0125] The operation steps are the same as those in Example 2, except that the D / (H / 2) value of the left-handed spiral stirring hook 8-1 and the right-handed spiral stirring hook 8-2 in Example 1 is adjusted to tan55°.

[0126] The results of Examples 2, 9 to 14 and Comparative Examples 2S to 2V are shown in Table 4.

[0127] Table 4 Summary of results of Examples 2, 9-14 and Comparative Examples 2S-V

[0128]

[0129]

[0130] The double-helix stirred reactor and process for producing high-viscosity silicone oil are not only suitable for the production of high-viscosity methyl silicone oil, but also suitable for the production of high-viscosity vinyl silicone oil, amino silicone oil, hydroxyl silicone oil and other modified silicone oils.

Claims

1. A double-helix stirred reactor for producing high-viscosity silicone oil, the stirred reactor comprising a reactor body (1), characterized in that: A main stirring rod (4) is provided in the kettle body (1) via the motor (3); a first rotating scraper (5-1) and a second rotating scraper (5-2) surrounding the kettle wall are connected to the bottom of the main stirring rod (4); the first rotating scraper (5-1) and the second rotating scraper (5-2) have an inclination angle of 20 to 30 degrees in the opposite direction of the rotation tangent of the main stirring rod (4); A lower fixed plate (10-1) and an upper fixed plate (10-2) are fixedly provided on the upper part of the kettle body (1) via a main stirring rod (4); The lower fixed plate (10-1) is provided with a driving gear (6) via the main stirring rod (4), and the driving gear (6) is provided with a transmission gear 1 (7-1), a transmission gear 2 (7-2), and a transmission gear 3 (7-3); The tops of the left spiral stirring hook (8-1) and the right spiral stirring hook (8-2) pass through the lower fixed plate (10-1) and the upper fixed plate (10-2), and the left spiral stirring hook (8-1), the right spiral stirring hook (8-2), and the transmission gear 1 (7-1) are respectively clamped on the lower fixed plate (10-1) through the ball bearing 1 (9-2), the ball bearing 2 (9-3), and the ball bearing 3 (9-1). The left spiral stirring hook (8-1) and the right spiral stirring hook (8-2) meet tan22.5°≤D / (H / 2)≤tan45°, where D is the diameter of the spiral and H is the lead or pitch of the spiral line. The specifications of the driving gear (6) are the same as those of the transmission gear 1 (7-1) and the transmission gear 2 (7-2), but the specifications of the driving gear (6) and the transmission gear 3 (7-3) are different, so that the transmission gear 2 (7-2) and the transmission gear 3 (7-3) form a speed ratio of 1.875:1, which leads to a speed ratio of 1.875:1 between the left spiral stirring hook (8-1) and the right spiral stirring hook (8-2).

2. The double-helix stirred reactor for producing high-viscosity silicone oil according to claim 1, characterized in that: The first rotating scraper (5-1) and the second rotating scraper (5-2) are made of 304 stainless steel.

3. The double-helix stirred reactor for producing high-viscosity silicone oil according to claim 2, characterized in that: The outer sides of the first rotating scraper (5-1) and the second rotating scraper (5-2) are close to the kettle wall, with a gap of 2 mm from the kettle wall.

4. The double-helix stirred reactor for producing high-viscosity silicone oil according to claim 1, characterized in that: The left spiral stirring hook (8-1) and the right spiral stirring hook (8-2) have opposite top-down rotation directions and opposite spiral directions.

5. The double-helix stirred reactor for producing high-viscosity silicone oil according to claim 4, characterized in that: The left-hand spiral stirring hook (8-1) rotates clockwise from top to bottom, and the spiral direction is counterclockwise; then the right-hand spiral stirring hook (8-2) rotates counterclockwise from top to bottom, and the spiral direction is clockwise; or, the left-hand spiral stirring hook (8-1) rotates counterclockwise from top to bottom, and the spiral direction is clockwise; then the right-hand spiral stirring hook (8-2) rotates clockwise from top to bottom, and the spiral direction is counterclockwise.

6. The double-helix stirred reactor for producing high-viscosity silicone oil according to claim 1, characterized in that: The specifications of the driving gear (6), the transmission gear 1 (7-1) and the transmission gear 2 (7-2) are the same, all of which are 1 module 16 teeth; the specifications of the transmission gear 3 (7-3) are 1 module 30 teeth.

7. The double-helix stirred reactor for producing high-viscosity silicone oil according to claim 1, characterized in that: A heat-conducting oil heating layer (2) is provided outside the kettle body (1).

8. The double-helix stirred reactor for producing high-viscosity silicone oil according to claim 1, characterized in that: The kettle body (1) is also provided with a DMC feed port (11), a capping agent feed port (12), a catalyst feed port (13), a vacuum port (14), a nitrogen port 1 (15), a nitrogen port 2 (16) and a discharge port (17).

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