Reaction kettle for preparing high-molecular-weight hindered phenol antioxidant and preparation method of antioxidant

Abstract

The invention discloses a reaction kettle for preparing a high-molecular-weight hindered phenol antioxidant and a preparation method of the antioxidant. The reaction kettle comprises a high-molecular-weight hindered phenol antioxidant kettle body, the kettle body is connected with a motor and communicated with a feed hopper, the motor is connected with a telescopic rod, the telescopic rod is connected with a rotating rod, the outer wall of the rotating rod is connected with a plurality of stirring plates, and the inner wall of the kettle body is connected with two temperature-controllable heating rods. According to the reaction kettle disclosed by the invention, the stirring plate and the stirring blades are used for rotating and lifting at the same time, so that various liquids can be uniformly stirred, the stirring time is shortened, the stirring efficiency is improved, and the electric quantity cost is saved. The preparation method of the antioxidant comprises the following steps: carrying out sectional heating (firstly carrying out low-temperature pre-reaction on raw materials and then carrying out heating reaction), carrying out catalytic reaction by adopting a sulfonic acid compound under negative pressure, and then carrying out washing, suction filtration and low-temperature crystallization to obtain a high-purity 1, 3, 5-trimethyl-2, 4, 6-(3, 5-di-tert-butyl-4-hydroxybenzyl) benzene product.

Description

Technical Field

[0001] The invention relates to the field of reaction kettle technology and antioxidant preparation, in particular to a reaction kettle for preparing a high molecular weight hindered phenol antioxidant and a method for preparing the antioxidant. Background Art

[0002] In the production process of high molecular weight hindered phenol antioxidant, solutions such as benzyl ether, 1,3,5-trimethylbenzene, catalyst and chloroform solvent need to be injected into a reactor to react and obtain the product.

[0003] However, the conventional reactor structure for synthesizing high molecular weight hindered phenol antioxidants usually adopts a single stirring method through a stirring rod, and the stirring rod can only stir the liquid at the same level, resulting in uneven mixed solution, affecting the synthesis purity of the synthesized antioxidant, and further affecting the performance of the antioxidant. In order to solve the above problems, the present invention proposes a reactor structure for the production of high molecular weight hindered phenol antioxidants. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a reaction kettle for preparing a high molecular weight hindered phenol antioxidant and a method for preparing the antioxidant. A stirring plate and a stirring blade are rotated and lifted at the same time, so that a variety of liquids can be stirred evenly, so that the purity of the synthesized antioxidant is improved, and at the same time, the stirring time is shortened and the stirring efficiency is improved, and the electricity cost of the synthesis process is saved.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A reactor for preparing a high molecular weight hindered phenol antioxidant comprises a high molecular weight hindered phenol antioxidant reactor, wherein the top of the high molecular weight hindered phenol antioxidant reactor is fixedly connected to a feed hopper, the top of the high molecular weight hindered phenol antioxidant reactor is fixedly connected to a motor, the output end of the motor is fixedly connected to a telescopic rod, the telescopic rod penetrates the high molecular weight hindered phenol antioxidant reactor and is rotatably connected thereto, the bottom of the telescopic rod is fixedly connected to a rotating rod, the outer wall of the rotating rod is fixedly connected to a plurality of stirring plates, and the inner wall of the high molecular weight hindered phenol antioxidant reactor is fixedly connected to a rotating rod. Two temperature-controllable heating rods are connected, the bottom of the rotating rod is fixedly connected to a reciprocating screw, the outer wall of the reciprocating screw is sleeved with a U-shaped plate, the U-shaped plate is fixedly connected to the inner bottom of the high molecular weight hindered phenol antioxidant reactor, the bottom of the reciprocating screw is fixedly connected to a stirring blade, the bottom of the high molecular weight hindered phenol antioxidant reactor is fixedly connected to a discharge hopper, the top of the high molecular weight hindered phenol antioxidant reactor is fixedly connected to an exhaust hopper, the outer wall of the exhaust hopper is fixedly connected to a safety valve, and the outer wall of the high molecular weight hindered phenol antioxidant reactor is fixedly connected to a display panel.

[0006] Preferably, the plurality of stirring plates are distributed at equal intervals, and each stirring plate is penetrated by a plurality of through holes.

[0007] Preferably, the telescopic rod, the rotating rod, the reciprocating screw rod and the stirring blade are all coaxially fixedly connected.

[0008] Preferably, the discharge hopper is located at the bottom of the high molecular weight hindered phenol antioxidant reaction kettle, and an electromagnetic valve is installed on the outer wall of the discharge hopper.

[0009] Preferably, the bottom plate of the high molecular weight hindered phenol antioxidant reaction kettle is fixedly connected with three supporting legs distributed at equal intervals.

[0010] Preferably, the bottom of the high molecular weight hindered phenol antioxidant reactor is fixedly connected to three fixed screws distributed at equal intervals, the outer wall of each fixed screw is sleeved with a hollow leg threadedly connected thereto, and the bottom of each hollow leg is fixedly connected to a support block.

[0011] The present invention also provides a method for preparing a high molecular weight hindered phenol antioxidant, and the synthesis process is as follows: Step 1: Pour 1,3,5-trimethylbenzene and benzyl ether (3,5-di-tert-butyl-4-hydroxybenzyl methyl ether) into the high molecular weight hindered phenol antioxidant kettle through the feed hopper, conduct pre-reaction at 30-45°C, rotate at 30-80r / min, and maintain stirring for 0.2-1 hour; Step 2: Add the catalyst and chloroform solvent into the kettle of the high molecular weight hindered phenol antioxidant through the feed hopper, maintain stirring for 3-6 hours at a reaction pressure of 0-80 KPa, a reaction temperature of 40-60° C., and a rotation speed of 30-100 r / min; Step 3: After the reaction is completed, the product is washed with deionizers and filtered, then crystallized at a low temperature of 2-10°C, and vacuum dried to obtain 330 products.

[0012] Preferably, the pre-reaction temperature in step 1 is lower than the reaction temperature in step 2, and the stirring speed in step 1 is lower than the stirring speed in step 2.

[0013] Preferably, the reaction pressure is 0-20 KPa.

[0014] Preferably, the catalyst is a sulfonic acid compound, specifically an aromatic sulfonic acid and an alkyl sulfonic acid. The aromatic sulfonic acid is benzenesulfonic acid, toluenesulfonic acid, p-toluenesulfonic acid, o-toluenesulfonic acid, m-toluenesulfonic acid, ethylbenzenesulfonic acid or propylbenzenesulfonic acid; the alkyl sulfonic acid is methylsulfonic acid, ethylsulfonic acid, propylsulfonic acid or butylsulfonic acid.

[0015] Among them, the mass ratio of benzyl ether to 1,3,5-trimethylbenzene in the feed ratio is 7-12:1; the mass ratio of catalyst to 1,3,5-trimethylbenzene is 0.6-1.4:1; and the mass ratio of solvent to 1,3,5-trimethylbenzene is 8-20:1.

[0016] The synthesis method comprises the following steps: using benzyl ether, mesitylene and sulfonic acid catalysts to react under the condition of chloroform as solvent; using 2,6-di-tert-butylphenol, polyformaldehyde and methanol to synthesize under the catalytic action of an alkaline catalyst dimethylamine aqueous solution at a temperature of 90°C-140°C, and using a liquid chromatograph to analyze the purity of the benzyl ether.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The output end of the motor drives the telescopic rod, the rotating rod, and multiple stirring plates to rotate, so that the mixed solution in the high molecular weight hindered phenol antioxidant reactor can be stirred to make it evenly mixed; the reciprocating screw and the stirring blades are driven to rotate by the rotation of the rotating rod. The rotation of the stirring blades can increase the contact area and collision frequency between the reactants, accelerate the reaction rate, and improve the conversion rate of the reaction.

[0018] 2. When the reciprocating screw rotates, it will cooperate with the U-shaped plate to drive the rotating rod, multiple stirring plates, reciprocating screw, and stirring blades to rotate and move up and down. During this process, the telescopic rod will be extended and retracted accordingly. Through the rotation and lifting of multiple stirring plates and stirring blades, various liquids can be mixed more evenly.

[0019] 3. The staff rotates the support block to drive the support block and the hollow leg to rotate, so that the hollow leg and the support block can be raised and lowered. By adjusting the height of the three support blocks, the device can be set horizontally to make the support of the device stable, and the device can be stable during subsequent reactions.

[0020] 4. In a high molecular weight hindered phenol antioxidant reactor, by staged heating (the raw materials are pre-reacted at low temperature first and then heated to react), under negative pressure, sulfonic acid compounds are used to catalyze the reaction, and then high-purity 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl)benzene products are obtained by washing, filtration and low-temperature crystallization.

[0021] In summary, by rotating and lifting the stirring plate and the stirring blades, a variety of liquids can be stirred evenly, the stirring time is shortened, the stirring efficiency is improved, and the electricity cost is saved; the equipment of the present invention adopts segmented heating to synthesize high-purity products under negative pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a reactor for preparing a high molecular weight hindered phenol antioxidant proposed in Example 1; Figure 2 It is a cross-sectional schematic diagram of a reaction kettle for preparing a high molecular weight hindered phenol antioxidant proposed in Example 1; Figure 3 This is a schematic diagram of the structure of a reactor for preparing a high molecular weight hindered phenol antioxidant proposed in Example 2.

[0023] In the figure: 1 high molecular weight hindered phenol antioxidant kettle body, 2 feed hopper, 3 motor, 4 telescopic rod, 5 rotating rod, 6 stirring plate, 7 through hole, 8 temperature controllable heating rod, 9 reciprocating screw, 10 U-type plate, 11 stirring blade, 12 discharge hopper, 13 exhaust hopper, 14 safety valve, 15 display panel, 16 support leg, 17 fixed screw, 18 hollow leg, 19 support block. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Example 1 Reference Figure 1-Figure 2 A reactor for preparing a high molecular weight hindered phenol antioxidant comprises a high molecular weight hindered phenol antioxidant reactor body 1, a feed hopper 2 is fixedly connected to the top of the high molecular weight hindered phenol antioxidant reactor body 1, and a plurality of raw materials (benzyl ether, 1,3,5-trimethylbenzene, a catalyst and chloroform solvent) are injected through the feed hopper 2 for reaction, a motor 3 is fixedly connected to the top of the high molecular weight hindered phenol antioxidant reactor body 1, a telescopic rod 4 is fixedly connected to the output end of the motor 3, the telescopic rod 4 penetrates the high molecular weight hindered phenol antioxidant reactor 1 and is rotatably connected thereto, a rotating rod 5 is fixedly connected to the bottom of the telescopic rod 4, and a plurality of stirring rods are fixedly connected to the outer wall of the rotating rod 5 Plate 6, multiple stirring plates 6 are distributed at equal intervals, and each stirring plate 6 is penetrated with multiple through holes 7. The mixed solution in the high molecular weight hindered phenol antioxidant kettle body 1 can be stirred and mixed evenly by rotating the stirring plate 6, and the through holes 7 penetrated on the stirring plate 6 can make the mixed solution more evenly mixed. When the stirring plate 6 rotates in the liquid, the through holes 7 can make the liquid pass through the stirring plate 6 more easily, forming more eddies and turbulence. This strong liquid flow helps to break up the clumps and boundary layers in the liquid, so that the solid particles or gases in the liquid are better dispersed and mixed, thereby improving the stirring effect and mass transfer efficiency.

[0026] Two temperature-controllable heating rods 8 are fixedly connected to the inner wall of the kettle body 1 of the high molecular weight hindered phenol antioxidant. The temperature-controllable heating rods 8 can heat the liquid to make the reaction temperature suitable, thereby promoting the reaction.

[0027] A reciprocating screw 9 is fixedly connected to the bottom of the rotating rod 5, and a U-shaped plate 10 is sleeved on the outer wall of the reciprocating screw 9. The U-shaped plate 10 is fixedly connected to the inner bottom of the high molecular weight hindered phenol antioxidant reactor 1. A stirring blade 11 is fixedly connected to the bottom of the reciprocating screw 9. The telescopic rod 4, the rotating rod 5, the reciprocating screw 9 and the stirring blade 11 are all coaxially fixedly connected. The rotation of the stirring blade 11 can increase the contact area and collision frequency between the reactants, accelerate the reaction rate, and improve the conversion rate of the reaction.

[0028] The bottom of the high molecular weight hindered phenol antioxidant kettle body 1 is fixedly connected with a discharge hopper 12, which is arranged at the bottom of the high molecular weight hindered phenol antioxidant reaction kettle 1. The outer wall of the discharge hopper 12 is installed with an electromagnetic valve. The top of the high molecular weight hindered phenol antioxidant kettle body 1 is fixedly connected with an exhaust hopper 13, and the outer wall of the exhaust hopper 13 is fixedly connected with a safety valve 14. By arranging the exhaust hopper 13 and the safety valve 14, the air pressure safety during the reaction can be guaranteed. The outer wall of the high molecular weight hindered phenol antioxidant kettle body 1 is fixedly connected with a display panel 15, which can control the opening and closing of various electrical components and adjust the reaction temperature. The bottom plate of the high molecular weight hindered phenol antioxidant kettle body 1 is fixedly connected with three support legs 16 distributed at equal intervals, which can provide stable support for the device.

[0029] During the test of the present invention, benzyl ether, 1,3,5-trimethylbenzene, a catalyst (sulfonic acid compound) and chloroform solvent are poured into a high molecular weight hindered phenol antioxidant kettle body 1 through a feed hopper 2, and a motor 3 is started. The output end of the motor 3 drives a telescopic rod 4, a rotating rod 5, and a plurality of stirring plates 6 to rotate, so that the mixed solution in the high molecular weight hindered phenol antioxidant reactor 1 can be stirred to make it uniformly mixed, and the through hole 7 penetrating the stirring plate 6 can make the mixed solution more uniformly mixed (when the stirring plate 6 rotates in the liquid, the through hole 7 can make the liquid pass through the stirring plate 6 more easily, forming more eddies and turbulence, and this strong liquid flow helps to break up the clumps and boundary layers in the liquid, so that the liquid The solid particles or gases are better dispersed and mixed, thereby improving the stirring effect and mass transfer efficiency); the reciprocating screw 9 and the stirring blade 11 are driven to rotate by the rotation of the rotating rod 5. The rotation of the stirring blade 11 can increase the contact area and collision frequency between the reactants, accelerate the reaction rate, and improve the conversion rate of the reaction; when the reciprocating screw 9 rotates, it will cooperate with the U-shaped plate 10 to drive the rotating rod 5, multiple stirring plates 6, reciprocating screw 9, and stirring blades 11 to rotate and move up and down. During this process, the telescopic rod 4 is correspondingly extended and retracted. By rotating and moving up and down multiple stirring plates 6 and stirring blades 11, multiple liquids can be mixed more evenly; the liquid can be heated by the controllable temperature heating rod 8 to make the reaction temperature suitable, thereby promoting the reaction.

[0030] Example 2 Reference Figure 3The difference between this embodiment and embodiment 1 is that in this embodiment, three fixed screws 17 distributed at equal intervals are fixedly connected to the bottom of the high molecular weight hindered phenol antioxidant reactor 1, and the outer wall of each fixed screw 17 is sleeved with a hollow leg 18 threadedly connected thereto, and the bottom of each hollow leg 18 is fixedly connected to a support block 19.

[0031] During the process of the present invention, the rotating support block 19 drives the support block 19 and the hollow leg 18 to rotate, so that the hollow leg 18 and the support block 19 are lifted and lowered. By adjusting the heights of the three support blocks 19, the device can be set horizontally, so that the support of the device is stable, and the device is stable during subsequent reactions.

[0032] Example 3 The difference between this embodiment and embodiments 1 and 2 is that in this embodiment, the inner wall of the high molecular weight hindered phenol antioxidant reactor 1 is provided with a protective layer, the protective layer is a fiberglass layer, the high molecular weight hindered phenol antioxidant reactor body 1 is hollow, and the high molecular weight hindered phenol antioxidant reactor 1 is filled with thermal insulation cotton.

[0033] In the process of the present invention, the glass fiber reinforced plastic layer is provided to have good corrosion resistance to chemical substances such as acid, alkali, salt, etc., and the heat preservation cotton is provided to perform heat preservation operation on the liquid in the kettle body 1 of the high molecular weight hindered phenol antioxidant.

[0034] The invention is mainly used for the synthesis of 1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl)benzene (hereinafter referred to as 330 auxiliary agent). The 330 auxiliary agent (1,3,5-trimethyl-2,4,6-(3,5-di-tert-butyl-4-hydroxybenzyl)benzene) comprises the following raw materials: benzyl ether (3,5-di-tert-butyl-4-hydroxybenzyl methyl ether), 1,3,5-trimethylbenzene, chloroform and a catalyst. The reaction is carried out under the condition that chloroform is used as a solvent. The catalyst is a sulfonic acid compound, which is one or more of aromatic sulfonic acids and alkyl sulfonic acids. The aromatic sulfonic acid can be benzenesulfonic acid, toluenesulfonic acid, p-toluenesulfonic acid, o-toluenesulfonic acid, m-toluenesulfonic acid, ethylbenzenesulfonic acid or propylbenzenesulfonic acid. The alkyl sulfonic acid can be methylsulfonic acid, ethylsulfonic acid, propylsulfonic acid or butylsulfonic acid.

[0035] The specific process of the synthesis of 330 additive is described in detail below.

[0036] Example 4 Weigh 15g of 1,3,5-trimethylbenzene and 140g of benzyl ether, pour them into the high molecular weight hindered phenol antioxidant kettle body 1 through the feed hopper 2, start the motor 3, drive the telescopic rod 4, the rotating rod 5, and the plurality of stirring plates 6 to rotate through the output end of the motor 3, close the upper cover, stir for 0.2 hours at a temperature of 30°C and a speed of 30r / min in the kettle, then stop the motor 3, open the upper cover, and add 12g of toluenesulfonic acid, 8g of methylsulfonic acid and 200g of chloroform solvent, start the vacuum system (this vacuum system is a prior art, a vacuum system can be added to the reactor of the present invention, or an external vacuum system can be used, as long as the interior of the reactor reaches a vacuum environment), at a reaction pressure of 0.1KPa, a rotation speed of 40r / min, and an inner temperature of the reactor (reaction temperature) of 40°C, stir for 3 hours. After the reaction is completed, the product is washed with deionizer 3 times and filtered 3 times, then crystallized at 2°C, and vacuum dried for 1 hour to obtain a 330 auxiliary agent product. The product is analyzed by liquid chromatography (Folley Instrument, model LC5090, the same below), and the purity is 99.8%.

[0037] Example 5 Weigh 15 g of 1,3,5-trimethylbenzene and 112 g of benzyl ether, pour them into a high molecular weight hindered phenol antioxidant kettle body 1 through a feed hopper 2, start a motor 3, drive a telescopic rod 4, a rotating rod 5, and a plurality of stirring plates 6 to rotate through the output end of the motor 3, close the upper cover, stir for 0.5 hour at a temperature of 35° C. and a rotation speed of 50 r / min in the kettle, then stop the motor 3, open the upper cover, add 15 g of ethylbenzenesulfonic acid and 120 g of chloroform solvent, start a vacuum system (this vacuum system is a prior art, and a vacuum system can be added to the reactor of the present invention, or an external vacuum system can be used, as long as a vacuum environment is achieved inside the kettle body), stir for 6 hours at a reaction pressure of 50 KPa, a rotation speed of 55 r / min, and a temperature in the kettle (reaction temperature) of 45° C. After the reaction is completed, the product is deionized and washed twice and filtered twice, then crystallized at a low temperature of 10° C., and vacuum dried for 1 hour to obtain a 330 auxiliary product. The product is analyzed by liquid chromatography, and the purity is 99.5%.

[0038] Example 6 Weigh 15g of 1,3,5-trimethylbenzene and 168g of benzyl ether, pour them into the high molecular weight hindered phenol antioxidant kettle body 1 through the feed hopper 2, start the motor 3, drive the telescopic rod 4, the rotating rod 5, and the multiple stirring plates 6 to rotate through the output end of the motor 3, close the upper cover, stir for 1 hour at a temperature of 40°C and a speed of 80r / min in the kettle, then stop the motor 3, open the upper cover, add 10g of p-toluenesulfonic acid, 2g of butyl sulfonic acid and 300g of chloroform solvent, and start the vacuum system (this vacuum system is used for the vacuum system). The vacuum system is a prior art. A vacuum system can be added to the reactor of the present invention, or an external vacuum system can be installed, as long as a vacuum environment is achieved inside the reactor body). The reaction pressure is 20 KPa, the rotation speed is 80 r / min, and the temperature in the reactor (reaction temperature) is 50°C. The reaction is stirred for 4 hours. After the reaction is completed, the product is deionized and washed 3 times and filtered 3 times, and then crystallized at 3°C ​​and vacuum dried for 1 hour to obtain a 330 auxiliary agent product. The product is analyzed by liquid chromatography, and the purity is 99.7%.

[0039] Example 7 Weigh 15g of 1,3,5-trimethylbenzene and 150g of benzyl ether, pour them into a high molecular weight hindered phenol antioxidant kettle body 1 through a feed hopper 2, start a motor 3, drive a telescopic rod 4, a rotating rod 5, and a plurality of stirring plates 6 to rotate through the output end of the motor 3, close the upper cover, stir for 0.6 hours at a temperature of 45°C and a rotation speed of 80r / min in the kettle, then stop the motor 3, open the upper cover, add 10g of propyl sulfonic acid and 250g of chloroform solvent, start a vacuum system (this vacuum system is a prior art, and a vacuum system can be added to the reactor of the present invention, or an external vacuum system can be used, as long as a vacuum environment is achieved inside the kettle), stir for 6 hours at a reaction pressure of 80KPa, a rotation speed of 100r / min, and a temperature in the kettle (reaction temperature) of 60°C. After the reaction is completed, the product is deionized and washed twice and filtered twice, then crystallized at a low temperature of 10°C, and vacuum dried for 1 hour to obtain a 330 auxiliary product. The product is analyzed by liquid chromatography, and the purity is 99.1%.

[0040] Comparative Example 1 Weigh 15 g of 1,3,5-trimethylbenzene and 112 g of benzyl ether and add them into a beaker, then add 15 g of ethylbenzenesulfonic acid and 150 g of chloroform solvent, control the reaction temperature to 45 ° C and stir for 6 hours. After the reaction is completed, the product is deionized and washed twice and filtered twice, then crystallized at 10 ° C and vacuum dried for 1 hour to obtain 330 auxiliary agent product. The product is analyzed by liquid chromatography and the purity is 81.3%.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A reaction kettle for preparing a high molecular weight hindered phenol antioxidant, comprising a high molecular weight hindered phenol antioxidant kettle body (1), characterized in that: The top of the high molecular weight hindered phenol antioxidant kettle (1) is fixedly connected to a feed hopper (2); the top of the high molecular weight hindered phenol antioxidant reactor (1) is fixedly connected to a motor (3); the output end of the motor (3) is fixedly connected to a telescopic rod (4); the telescopic rod (4) penetrates the high molecular weight hindered phenol antioxidant kettle (1) and is rotatably connected thereto; the bottom of the telescopic rod (4) is fixedly connected to a rotating rod (5); the outer wall of the rotating rod (5) is fixedly connected to a plurality of stirring plates (6); the inner wall of the high molecular weight hindered phenol antioxidant kettle (1) is fixedly connected to two temperature-controllable heating rods (8); the bottom of the rotating rod (5) is fixedly connected to a rotating rod (5); A reciprocating screw (9) is connected, the outer wall of the reciprocating screw (9) is sleeved with a U-shaped plate (10), the U-shaped plate (10) is fixedly connected to the inner bottom of the high molecular weight hindered phenol antioxidant kettle (1), the bottom of the reciprocating screw (9) is fixedly connected to a stirring blade (11), the bottom of the high molecular weight hindered phenol antioxidant kettle (1) is fixedly connected to a discharge hopper (12), the top of the high molecular weight hindered phenol antioxidant kettle (1) is fixedly connected to an exhaust hopper (13), the outer wall of the exhaust hopper (13) is fixedly connected to a safety valve (14), and the outer wall of the high molecular weight hindered phenol antioxidant kettle (1) is fixedly connected to a display panel (15).

2. A reaction kettle for preparing a high molecular weight hindered phenol antioxidant according to claim 1, characterized in that: The plurality of stirring plates (6) are distributed at equal intervals, and each stirring plate (6) is provided with a plurality of through holes (7).

3. A reaction kettle for preparing a high molecular weight hindered phenol antioxidant according to claim 1, characterized in that: The telescopic rod (4), the rotating rod (5), the reciprocating screw rod (9) and the stirring blade (11) are all coaxially fixedly connected.

4. A reaction kettle for preparing a high molecular weight hindered phenol antioxidant according to claim 1, characterized in that: The discharge hopper (12) is arranged at the bottom of the high molecular weight hindered phenol antioxidant kettle (1), and an electromagnetic valve is installed on the outer wall of the discharge hopper (12).

5. The reaction kettle for preparing high molecular weight hindered phenol antioxidant according to claim 1, characterized in that: The bottom plate of the high molecular weight hindered phenol antioxidant kettle (1) is fixedly connected to three support legs (16) distributed at equal intervals.

6. The reaction kettle for preparing high molecular weight hindered phenol antioxidant according to claim 1, characterized in that: The bottom of the high molecular weight hindered phenol antioxidant kettle (1) is fixedly connected to three fixed screws (17) distributed at equal intervals, the outer wall of each fixed screw (17) is sleeved with a hollow leg (18) threadedly connected thereto, and the bottom of each hollow leg (18) is fixedly connected to a support block (19).

7. A method for preparing a high molecular weight hindered phenol antioxidant using the reactor for preparing a high molecular weight hindered phenol antioxidant as claimed in any one of claims 1 to 6, wherein the synthesis process is as follows: Step 1: Pour 1,3,5-trimethylbenzene and benzyl ether (3,5-di-tert-butyl-4-hydroxybenzyl methyl ether) into the high molecular weight hindered phenol antioxidant kettle (1) through the feed hopper (2), conduct a pre-reaction at a temperature of 30-45° C., a rotation speed of 30-80 r / min, and maintain stirring for 0.2-1 hour; Step 2: adding a catalyst and a chloroform solvent into the high molecular weight hindered phenol antioxidant kettle (1) through a feed hopper (2), maintaining stirring for 3-6 hours at a reaction pressure of 0-80 KPa, a reaction temperature of 40-60° C., and a rotation speed of 30-100 r / min; Step 3: After the reaction is completed, the product is washed with deionizers and filtered, then crystallized at a low temperature of 2-10°C, and vacuum dried to obtain 330 products.

8. A method for preparing a high molecular weight hindered phenol antioxidant using the reactor for preparing a high molecular weight hindered phenol antioxidant as claimed in any one of claims 7, characterized in that: The pre-reaction temperature of step 1 is lower than the reaction temperature of step 2, and the stirring speed of step 1 is lower than the stirring speed of step 2.

9. A method for preparing a high molecular weight hindered phenol antioxidant using the reactor for preparing a high molecular weight hindered phenol antioxidant as claimed in any one of claims 7, characterized in that: The reaction pressure is 0-20KPa.

10. A method for preparing a high molecular weight hindered phenol antioxidant using the reactor for preparing a high molecular weight hindered phenol antioxidant as claimed in any one of claim 7, characterized in that: The catalyst is a sulfonic acid compound, specifically an aromatic sulfonic acid and an alkyl sulfonic acid. The aromatic sulfonic acid is benzenesulfonic acid, toluenesulfonic acid, p-toluenesulfonic acid, o-toluenesulfonic acid, m-toluenesulfonic acid, ethylbenzenesulfonic acid or propylbenzenesulfonic acid; the alkyl sulfonic acid is methylsulfonic acid, ethylsulfonic acid, propylsulfonic acid or butylsulfonic acid.

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