A reactive hindered amine flame retardant and antioxidant and preparation method thereof

Abstract

The present invention relates to the technical field of functional additives for polymer materials, and in particular to a reactive hindered amine flame retardant and an antioxidant and a preparation method thereof, wherein the structural formula is shown in the following formula I: wherein R1 is R2 is R3 is - - - represents the free radical bonding position. The reactive hindered amine flame retardant and antioxidant of the present invention has a flame retardant effect and can avoid the flammable characteristic of polymer materials. In addition, the reactive hindered amine flame retardant and antioxidant can be applied to more environments, and the reaction type used in the preparation is simple and easy to produce.

Description

Technical Field

[0001] The invention relates to the technical field of functional additives for polymer materials, and in particular to a reactive hindered amine flame retardant and an antioxidant and a preparation method thereof. Background Art

[0002] Hindered amines are a class of organic amine compounds with steric hindrance. Currently, the most common hindered amine compound matrix is ​​2,2,6,6-tetramethylpiperidine. Since there are two methyl groups on the carbon atoms on both sides of the nitrogen atom in its structure, the groups on the nitrogen atom are subject to steric hindrance, so they are called hindered amines. Hindered amine light stabilizers are prepared by the derivatization reaction of 2,2,6,6-tetramethylpiperidine, and can play an anti-aging effect. Its mechanism of action is as follows: When the polymer material is exposed to light, alkoxy free radicals, alkyl free radicals and peroxy free radicals will be generated. After exposure to light, the hindered amine will be converted into stable nitroxide free radicals, which will capture the free radicals in the polymer material to generate corresponding esters and peroxy esters, and then the esters and peroxy esters will continue to combine with the free radicals in the polymer material to regenerate nitroxide free radicals. This repeated action achieves an anti-aging effect.

[0003] Later, in the process of research and development of hindered amine light stabilizers, researchers often introduced some functional groups into hindered amine light stabilizers to make them multifunctional. For example, the light stabilizer synthesized in CN112010800B "A hindered amine light stabilizer containing hindered phenols and its preparation method and application" contains both hindered phenols and hindered amines, which can slow down the aging or degradation caused by light, heat or oxidation. As an additive for polymer materials, the size of its molecular weight is particularly important. Low molecular weight hindered amines have poor extraction resistance and easy migration and precipitation in practical applications, resulting in reduced effects. Therefore, a large number of polymer hindered amine light stabilizers have been developed. People have found that high molecular weight hindered amine light stabilizers have excellent performance, which can improve their extraction resistance, migration resistance, etc., but too high molecular weight will also hinder their light stability performance, so it is very necessary to control the molecular weight. Generally, a molecular weight between 2000 and 3000 is a more suitable range.

[0004] Reactive hindered amine light stabilizers introduce reactive groups into the hindered amine molecular structure, so that they can be grafted or bonded to the polymer backbone during polymer preparation, making the polymer permanently light-stabilized. Reactive light stabilizers can avoid the problem of migration and precipitation.

[0005] For example, CN109678790A "A reactive hindered amine light stabilizer and its preparation method" dissolves tetramethylpiperidinol and its derivatives in a solvent, adds an inhibitor and α, β-unsaturated carboxylic acid ester, and carries out esterification reaction under the action of a catalyst, and then washes and desolventizes to obtain a light stabilizer. It has the characteristics of simple process, mild conditions, and good light transmittance, but the light stabilizer prepared by this method has relatively simple performance.

[0006] Another example is CN116693938A "Reactive composite light stabilizer and its application, light-stable modified polymer material" which includes a reactive ultraviolet absorber and a reactive hindered amine light stabilizer bonded together for synergistic effect, with better compounding effect, lower volatility and higher stability against light degradation. However, the reactive composite light stabilizer developed by this method has fewer effective functional groups and can only play its role by being grafted into materials with high polymerization degree.

[0007] Since polymer materials are mainly composed of C, H, and O, they are highly flammable and often become the source of fire in daily use, posing a threat to people's life safety. At the same time, hindered amine light stabilizers are one of the most important raw materials in polymer materials, but there is little research on hindered amine light stabilizers with flame retardant properties.

[0008] For example, CN104231266B "Single-component macromolecular intumescent flame retardant containing hindered amine structure and preparation method and application thereof" produces a single-component macromolecular intumescent flame retardant containing a hindered amine structure, which has excellent thermal stability, charring performance and water resistance. However, the hindered amine prepared by this method requires a high degree of control over the molecular weight, which is not conducive to its application in polymer materials and is prone to precipitation and migration problems.

[0009] Therefore, it is urgent to develop a reactive hindered amine with diversified usage methods, strong light stability and flame retardant properties. Summary of the invention

[0010] The main purpose of the present invention is to provide a reactive hindered amine flame retardant and an antioxidant and a preparation method thereof, so as to solve the problems in the prior art that the hindered amine light stabilizer has a single use method in materials, poor applicability, single function and poor flame retardant performance.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0012] In one aspect, the present invention provides a reactive hindered amine flame retardant antioxidant, the structural formula of which is shown in the following formula I:

[0013]

[0014] Among them, R1 is R2 is R3 is --- represents the bonding position of free radical. (Ⅰ)

[0015] Another aspect of the present invention provides a method for preparing a reactive hindered amine flame retardant antioxidant, comprising the following steps:

[0016] S1. The compound shown in formula II

[0017]

[0018] The mixture is mixed with N-methyl-5-hexen-1-amine and sodium carbonate, and a substitution reaction occurs in a solvent to obtain the reactive hindered amine flame retardant and antioxidant.

[0019] The hindered amine antioxidant of the present application carries reactive functional groups and can act on most polymer materials and be grafted with the polymer materials. This method can make the polymer materials permanently acquire the characteristics of the hindered amine light stabilizer and increase the water washability of the hindered amine light stabilizer. The applicant unexpectedly discovered that the hindered amine flame retardant antioxidant of the present application can be suitable for direct blending with polymers or grafting with polymer materials, and has a wider range of use, avoiding the problem of single use of common hindered amine light stabilizers.

[0020] In some embodiments, the method for preparing the compound represented by formula II comprises the following steps:

[0021] a. Mix N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, hexachloro-1,3,5,2,4,6-triazatriphosphine and sodium carbonate, and carry out substitution reaction in a solvent to obtain a compound shown in formula III

[0022]

[0023] b. The compound represented by formula III is mixed with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide, 1,3-propylene glycol, Zn(OTf)2, Zn and 4A molecular sieves, and a Williamson reaction is carried out in a solvent to obtain a compound represented by formula II.

[0024] Hindered amine light stabilizers are mostly used in the synthesis of polymer materials to prevent polymer materials from decomposing and aging under long-term light exposure. Polymer materials are common flammable materials and have a serious impact on people's life safety. The present application introduces 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide into the structure of the product, which can enhance the flame retardant effect of the antioxidant. In addition, the applicant unexpectedly discovered that the introduction of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide into the product can also slightly reduce the alkalinity of the hindered amine, thereby improving its usability in weakly acidic polymer materials.

[0025] In addition, hindered amine light stabilizers, due to their small molecular weight, will precipitate when used in combination with polymer materials, and have poor extraction resistance and low yield during the preparation process. In the present application, the compound shown in Formula III is subjected to Williamson reaction to increase the molecular weight of the macromonomer molecule, and the product can be blended with polymer materials for use.

[0026] In some embodiments, in step a, the molar ratio of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine to sodium carbonate is 1:(1.1-1.3).

[0027] Preferably, in step a, the molar ratio of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine to sodium carbonate is 1:1.2.

[0028] In some embodiments, the reaction temperature of step a is 70-90° C., and the reaction time is 1-3 h.

[0029] Preferably, the reaction temperature in step a is 80° C. and the reaction time is 2 h.

[0030] In some embodiments, the solvent in step a is water, and the amount of water added is 5 to 10 times the volume by mass of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine.

[0031] In some embodiments, the experimental conditions in step S1 can refer to step a.

[0032] In some embodiments, the step b is specifically: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide is mixed with Zn(OTf)2 and Zn and added to toluene, and then 4A molecular sieves with the mass of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide are added, and the compound shown in formula III is added while stirring. After the addition is completed, stirring at room temperature, and then 1,3-propylene glycol is slowly added dropwise to the reaction solution, and stirring at room temperature to obtain the compound shown in formula II.

[0033] Preferably, the step b is specifically as follows: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide is mixed with Zn(OTf)2 and Zn and added to toluene, and then 4A molecular sieves of 4 to 6 times the mass of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide are added, and the compound shown in formula III is added while stirring. After the addition is completed, stirring is performed at room temperature for 4 to 10 hours, and then 1,3-propylene glycol is slowly added dropwise to the reaction solution, and the dropping rate is controlled to 1 to 3 mL / min and stirred at room temperature for 14 to 18 hours to obtain the compound shown in formula II.

[0034] The present application adjusts the filler order so that the compound represented by formula III reacts with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide first, and then slowly drops 1,3-propylene glycol to enable it to react better with the intermediate, thereby improving the product yield.

[0035] In some embodiments, the volume of toluene is 10 to 14 times the mass volume of the compound represented by Formula III.

[0036] In some embodiments, in step S1, the molar ratio of the compound represented by formula II to N-methyl-5-hexen-1-amine is 1:(2.4-2.8).

[0037] Preferably, in step S1, the molar ratio of the compound represented by formula II to N-methyl-5-hexen-1-amine is 1:2.6.

[0038] In some embodiments, in step S1, the molar ratio of the compound represented by formula II to sodium carbonate is 1:(1.2-1.4).

[0039] Preferably, in step S1, the molar ratio of the compound represented by formula II to sodium carbonate is 1:1.3.

[0040] In some embodiments, in step a, the molar ratio of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine to hexachloro-1,3,5,2,4,6-triazatriphosphine is (4-4.2):1.

[0041] Preferably, in step a, the molar ratio of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine to hexachloro-1,3,5,2,4,6-triazatriphosphine is 4.1:1.

[0042] In some embodiments, in step b, the molar ratio of the compound represented by formula III to 1,3-propylene glycol is 1:(0.4-0.5).

[0043] Preferably, in step b, the molar ratio of the compound represented by formula III to 1,3-propylene glycol is 1:0.45.

[0044] In some embodiments, in step b, the molar ratio of the compound represented by formula III to Zn and Zn(OTf)2 is 1:(0.6-0.8):(0.18-0.22).

[0045] Preferably, in step b, the molar ratio of the compound represented by formula III to Zn and Zn(OTf)2 is 1:0.7:0.2.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] (1) The reactive hindered amine flame retardant and antioxidant of the present invention has a moderate molecular weight and a reactive group, strong applicability, and good extraction resistance. It can not only be directly mixed with polymer materials to prevent precipitation and migration, but also can undergo grafting reaction with polymer materials to enable the polymer materials to permanently obtain the performance of the reactive hindered amine flame retardant and antioxidant, and can make the reactive hindered amine flame retardant and antioxidant have better water washing resistance.

[0048] (2) The reactive hindered amine flame retardant antioxidant of the present invention has more functional groups. When used in polymer materials, it can not only prevent the polymer materials from light aging and decomposition, but also have a flame retardant effect, making the polymer materials safer to use.

[0049] (3) The reactive hindered amine flame retardant and antioxidant of the present invention is slightly weaker in alkalinity than the traditional reactive hindered amine flame retardant and antioxidant, and can be used well in some acidic environments and is more stable.

[0050] (4) The reaction type used in the preparation process of the reactive hindered amine flame retardant and antioxidant of the present invention is relatively simple and easy to implement. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Example 1

[0053] This embodiment provides a method for preparing a reactive hindered amine flame retardant antioxidant, comprising the following steps:

[0054] (1) 100 g (470.85 mmol) of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, 39.9 g (114.84 mmol) of hexachloro-1,3,5,2,4,6-triazatriphosphine and 14.61 g (137.81 mmol) of sodium carbonate were added to 800 mL of water, heated to 80° C., and stirred for 2 h to obtain a compound of formula III;

[0055] (2) 66.9 g (257.32 mmol) of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide, 24.94 g (68.62 mmol) of Zn(OTf)2 and 15.7 g (240.16 mmol) of Zn were mixed and added to 3900 mL of toluene, and then 334.5 g of 4A molecular sieve was added. 300 g (343 mmol) of the compound represented by formula III prepared in step (1) was added while stirring. After the addition was completed, the mixture was stirred at 35° C. for 7 h, and then 11.75 g (154.4 mmol) of 1,3-propylene glycol was slowly added dropwise to the reaction solution at a dropping rate of 2 mL / min and stirred at room temperature for 16 h to obtain the compound represented by formula II.

[0056] (3) Take 300 g (137.27 mmol) of the compound represented by formula II obtained in step (2), 20.97 (178.45 mmol) of N-methyl-5-hexen-1-amine and 26.36 g (164.72 mmol) of sodium carbonate, add them to 800 mL of water, heat to 80° C., stir for 2 h, and obtain a reactive hindered amine flame retardant and antioxidant.

[0057] Example 2

[0058] This embodiment provides a method for preparing a reactive hindered amine flame retardant antioxidant, comprising the following steps:

[0059] (1) 100 g (470.85 mmol) of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, 40.92 g (117.71 mmol) of hexachloro-1,3,5,2,4,6-triazatriphosphine and 13.73 g (129.48 mmol) of sodium carbonate were added to 500 mL of water, heated to 70° C., and stirred for 1 h to obtain a compound of formula IV;

[0060] (2) 53.57 g (205.86 mmol) of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide, 22.45 g (61.76 mmol) of Zn(OTf)2 and 13.46 g (205.86 mmol) of Zn were mixed and added to 3000 mL of toluene, and then 214.28 g of 4A molecular sieve was added. 300 g (343 mmol) of the compound represented by formula III prepared in step (1) was added while stirring. After the addition was completed, the mixture was stirred at 35° C. for 4 h, and then 10.44 g (137.25 mmol) of 1,3-propylene glycol was slowly added dropwise to the reaction solution at a dropping rate of 1 mL / min and stirred at room temperature for 14 h to obtain the compound represented by formula II.

[0061] (3) Take 300 g (137.27 mmol) of the compound represented by formula II obtained in step (2), 20.97 (178.45 mmol) of N-methyl-5-hexen-1-amine and 28.55 (178.45 mmol) of sodium carbonate, add them to 3000 mL of water, raise the temperature to 90° C., and stir for 3 h to obtain a reactive hindered amine flame retardant and antioxidant.

[0062] Example 3

[0063] This embodiment provides a method for preparing a reactive hindered amine flame retardant antioxidant, comprising the following steps:

[0064] (1) 100 g (470.85 mmol) of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, 38.97 g (112.11 mmol) of hexachloro-1,3,5,2,4,6-triazatriphosphine and 15.45 g (145.74 mmol) of sodium carbonate were added to 1000 mL of water, heated to 90° C., and stirred for 3 h to obtain a compound represented by formula IV;

[0065] (2) 80.35 g (308.78 mmol) of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide, 27.44 g (75.48 mmol) of Zn(OTf)2 and 17.95 g (274.47 mmol) of Zn were mixed and added to 4500 mL of toluene, and then 482.13 g of 4A molecular sieve was added. 300 g (343 mmol) of the compound represented by formula III prepared in step (1) was added while stirring. After the addition was completed, the mixture was stirred at 35° C. for 10 h, and then 13 g (171.57 mmol) of 1,3-propylene glycol was slowly added dropwise to the reaction solution at a dropping rate of 3 mL / min and stirred at room temperature for 18 h to obtain the compound represented by formula II.

[0066] (3) Take 300 g (137.27 mmol) of the compound represented by formula II prepared in step (2), 19.35 (164.72 mmol) of N-methyl-5-hexen-1-amine and 24.16 (150.99 mmol) of sodium carbonate, add them to 1500 mL of water, raise the temperature to 70°C, and stir for 1 hour to obtain a reactive hindered amine flame retardant and antioxidant.

[0067] Example 4

[0068] This embodiment provides a reactive hindered amine flame retardant antioxidant, and the specific implementation method is the same as that of Example 1, except that in step (1), the amount of hexachloro-1,3,5,2,4,6-triazatriphosphine added is 27 g.

[0069] Example 5

[0070] This embodiment provides a hindered amine flame retardant antioxidant, and the specific implementation method is the same as that of Example 1, except that in step (2), the added amount of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide is 187.49 g.

[0071] Example 6

[0072] This embodiment provides a hindered amine flame retardant antioxidant, and the specific implementation method is the same as that of Example 1, except that 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide is not added.

[0073] Example 7

[0074] This embodiment provides a reactive hindered amine flame retardant antioxidant, and the specific implementation method is the same as that of Example 1, except that 1,3-propylene glycol is not added.

[0075] Example 8

[0076] This embodiment provides a reactive hindered amine flame retardant antioxidant, and the specific implementation method is the same as that of Example 1, except that step (2) is: 66.9g (257.32mmol) of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide, 24.94g (68.62mmol) of Zn(OTf)2 and 15.7g (240.16mmol) of Zn are mixed and added to 3900mL of toluene, and then 334.5g of 4A molecular sieve is added, and 11.75g ​​(154.4mmol) of 1,3-propylene glycol is slowly added dropwise while stirring. After the addition is completed, 300g (343mmol) of the compound shown in formula III prepared in step (1) is added to the reaction solution, and the mixture is stirred at room temperature for 16h to obtain the compound shown in formula II.

[0077] Performance Test:

[0078] (1) Flame retardant and aging resistance

[0079] In terms of mass ratio, 0.2% of the antioxidant of each embodiment except Examples 4 and 5 was grafted and modified with 99.6% polyisoprene, and then mixed with 0.2% sulfur for extrusion and spinning; Example 1, Example 4 and Example 5 were respectively blended with polyisoprene and sulfur in the above-mentioned mass ratio for extrusion and spinning, and the limiting oxygen index (LOI) test was performed according to the STMD2863 standard. The spinning was placed in a xenon lamp aging test box for aging test, and the tensile strength was measured according to the ASTMD638 standard. The retention rate was calculated, and the initial tensile strength retention rate was regarded as 100%.

[0080] (2) Precipitation performance

[0081] By mass ratio, 0.2% of the antioxidant of Examples 1-8 was blended with 99.6% of polyisoprene and 0.2% of sulfur to form a spinning yarn, and a precipitation test was performed by observing the surface morphology. When the spinning yarn showed one of the following phenomena, fogging, breakage, bubbles and discoloration, it was considered to be precipitated. The test results are shown in Table 1. Among them, polyisoprene was purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd., and the structure was 1,4-trans polyisoprene, a colorless liquid.

[0082] Table 1

[0083]

[0084]

[0085] As can be seen from Table 1, Examples 1 to 3 have good flame retardancy, aging resistance and precipitation resistance. In Example 4, due to the change in the molar ratio of N-butyl-2,2,6,6-tetramethyl-4-piperidine to hexachloro-1,3,5,2,4,6-triazatriphosphine, the halogen on hexachloro-1,3,5,2,4,6-triazatriphosphine is reduced, and the synthesized hindered amine antioxidant does not have a reactive group and cannot be grafted with polyisoprene. In addition, the molecular weight is also reduced, and precipitation occurs during the blending process, resulting in a decrease in aging performance; in Example 5, due to the change in the molar ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide to the compound shown in Formula IV, there is no group that can undergo a substitution reaction with it during the synthesis of the compound shown in Formula II, and the reaction fails, resulting in the hindered amine antioxidant The aging agent does not have a reactive group, and precipitation occurs after blending. Due to the excessive acidic groups in the system, the hindered amine is deactivated, resulting in severe aging after 500 hours. In Example 6, due to the lack of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide, the flame retardant performance of the system is reduced. In addition, due to the strong alkalinity of the system, deactivation occurs when coexisting with sulfur, resulting in severe aging after 500 hours, and precipitation occurs. In Example 7, due to the lack of 1,3-propylene glycol, the molecular weight of the system is too low, precipitation occurs in blending, and the use method is single. In Example 8, the order of adding materials is changed, so that the compound shown in Formula III cannot react with the hydroxyl groups at both ends of 1,3-propylene glycol at the same time, resulting in a reduction of the molecular weight of the product by half, precipitation occurs in blending, and the obtained product cannot be blended with polymer materials. The test results show that the reactive hindered amine flame retardant and antioxidant prepared by the present invention has obvious flame retardant effect, good anti-aging performance, wider applicability, and stronger miscibility with polymer materials.

[0086] Finally, it should be noted that the above specific implementation methods 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 examples, 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 spirit 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 reactive hindered amine flame retardant antioxidant, characterized in that: Its structural formula is shown in the following formula (I): （Ⅰ）； Among them, R1 is , R2 is , R3 is , Represents the bonding position of the free radical.

2. A method for preparing a reactive hindered amine flame retardant and antioxidant according to claim 1, characterized in that: The steps include: S1. The compound represented by formula (II) （Ⅱ） The mixture is mixed with N-methyl-5-hexen-1-amine and sodium carbonate, and a substitution reaction occurs in a solvent to obtain the reactive hindered amine flame retardant and antioxidant.

3. The method for preparing a reactive hindered amine flame retardant and antioxidant according to claim 2, characterized in that: The preparation method of the compound represented by formula (II) comprises the following steps: a. Mix N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, hexachloro-1,3,5,2,4,6-triazatriphosphine and sodium carbonate, and carry out substitution reaction in a solvent to obtain a compound represented by formula (III): （Ⅲ）； b. The compound represented by formula (III) is mixed with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide, 1,3-propylene glycol, Zn(OTf)2, Zn and 4A molecular sieves, and a Williamson reaction is carried out in a solvent to obtain a compound represented by formula (II).

4. The method for preparing a reactive hindered amine flame retardant antioxidant according to claim 2, characterized in that: In the step S1, the molar ratio of the compound represented by formula (II) to N-methyl-5-hexen-1-amine is 1:(2.4-2.8).

5. The method for preparing a reactive hindered amine flame retardant and antioxidant according to claim 2, characterized in that: In the step S1, the molar ratio of the compound represented by formula (II) to sodium carbonate is 1:(1.1-1.3).

6. The method for preparing a reactive hindered amine flame retardant antioxidant according to claim 3, characterized in that: In the step a, the molar ratio of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine to hexachloro-1,3,5,2,4,6-triazatriphosphine is (4-4.2):

1.

7. The method for preparing a reactive hindered amine flame retardant and antioxidant according to claim 3, characterized in that: In the step b, the molar ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-ethanol 10-oxide to the compound represented by formula (III) is (0.6-0.9):

1.

8. The method for preparing a reactive hindered amine flame retardant and antioxidant according to claim 7, characterized in that: In the step b, the molar ratio of the compound represented by formula (III) to 1,3-propylene glycol is 1:(0.4-0.5).

9. The method for preparing a reactive hindered amine flame retardant and antioxidant according to claim 7, characterized in that: In the step b, the molar ratio of the compound represented by formula (III) to Zn and Zn(OTf)2 is 1:(0.6-0.8):(0.18-0.22).

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