A hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate, a preparation method thereof, and applications thereof

Abstract

The present invention discloses a hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate, a preparation method and an application thereof. The hindered amine light stabilizer contains two piperidyl groups and has cyclohexane as the core, and its structure is shown by formula (I): #imgabs0# R1 is selected from the elements O or N; R2 is selected from H, an oxygen free radical, -OH, -Cl, -CH2CN, an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, a cycloalkoxy group having 5 to C 12 The hindered amine light stabilizer of the present invention contains two hindered amine piperidyl groups and has good heat resistance; when used as a polymer light stabilizer, it can greatly improve the anti-photoaging effect of the polymer. The present invention also discloses a preparation method of the hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate, which has simple conditions, is easy to operate, and has broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the field of light stabilizers, and specifically relates to a hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate, a preparation method thereof, and an application thereof. Background Art

[0002] At present, polymer materials are widely used in various fields, but polymer materials have the natural characteristic of aging. After polymer molecules absorb ultraviolet light energy, they will transition from the ground state to the excited state. If they are in the excited state for a long time, it will further cause the polymer molecules to break chains to generate free radicals, and the existence of free radicals will accelerate the aging and degradation of polymers. The specific aging process is as follows:

[0003] Chain Initiation

[0004] R· + O2 → ROO·

[0005] Chain Propagation ROO· + RH → ROOH + R·

[0006] ROOH → R· + ·OOH

[0007] ROOH → RO· + ·OH

[0008] RO· + RH → ROH + R·

[0009] RH + ·OH → R· + H2O

[0010] Chain Termination ROO· + ROO· → ROOR + O2

[0011] ROO· + R· → ROOR

[0012] R· + R· → R - R

[0013] ROO· + RO· → ROR + O2.

[0014] Hindered amines are a class of organic amine compounds with high steric hindrance. Hindered amine light stabilizers are the most effective light stabilizers today, enabling polymers to have better resistance to photoaging. The stabilization mechanism of hindered amine light stabilizers for polymers is relatively complex and has not been fully understood yet. However, the research results of many studies on the stabilization mechanism of hindered amine light stabilizers show that hindered amine light stabilizers mainly stabilize polymers through three aspects: capturing free radicals, quenching singlet oxygen, and decomposing hydroperoxides: (1) During the light stabilization process, hindered amine light stabilizers are first oxidized into nitroxide free radicals, which can capture the active free radicals generated in the polymer, thereby breaking the chain of the photooxidation reaction and achieving the purpose of light stabilization; (2) Singlet oxygen has very high chemical activity and can cause polymer degradation reactions. There are relatively few reports on the detailed mechanism of hindered amine light stabilizers quenching singlet oxygen. Some literature explains that through energy transfer, the excited singlet oxygen returns to the ground state, or a charge transfer complex is formed between the hindered amine light stabilizer and singlet oxygen, thereby quenching singlet oxygen and playing a role in light stabilization; (3) Hindered amine light stabilizers can effectively decompose hydroperoxides and convert them into relatively stable alcohol and ketone compounds, thereby effectively inhibiting the photooxidative degradation reaction of polymers. The specific reaction mechanism is as follows:

[0015] Oxidized

[0016]

[0017] Capturing free radicals

[0018]

[0019] Decomposing hydroperoxides

[0020]

[0021] The synthesis of hindered amine light stabilizers is mainly achieved by grafting hindered amine monomers such as 2,2,6,6-tetramethylpiperidinol, 1,2,2,6,6-pentamethylpiperidinol, or aminopiperidine onto different chemical groups to obtain various differential light stabilizers to meet the requirements of different polymers for anti-photoaging performance. For example, the light stabilizer Tinuvin770 produced by BASF in Germany is synthesized by esterification or transesterification reaction of dimethyl sebacate with different piperidyl monomers, and its structure is shown in the following formula (a):

[0022]

[0023] Related patents such as US5605761A and US3640928A also obtain this product from the perspective of transesterification.

[0024] The light stabilizer Tinuvin 770 is applicable to polyethylene, polystyrene, polypropylene, ABS resin, polyester, polyurethane, etc. However, this product relies on imports, and domestic demand enterprises are easily restricted. Therefore, the present invention provides a substitute for the light stabilizer Tinuvin 770, which has the same thermal stability as the light stabilizer Tinuvin 770 and excellent light stabilization effects, and has a better anti-aging effect.

[0025] In view of this, the present invention is specifically proposed. Summary of the Invention

[0026] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate, a preparation method and an application thereof. The hindered amine light stabilizer of the present invention can replace the product of the light stabilizer Tinuvin 770. This compound has good thermal stability, excellent light stabilization effects on polyolefins and polyamides, and a better anti-aging effect.

[0027] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0028] The first object of the present invention is to provide a hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate, and its structural formula is shown as the following formula (I):

[0029]

[0030] Among them, R1 is selected from the elements O or N; R2 is selected from H, oxygen free radical, -OH, -Cl, -CH2CN, C1-C8 alkyl, C1-C8 alkoxy, C5-C 12 cycloalkoxy, C3-C6 alkenyl, C1-C3 alkyl substituted by benzene.

[0031] The hindered amine light stabilizer of the present invention has cyclohexane as the core and contains two hindered amine piperidyl groups, and has good heat resistance; when used as a polymer light stabilizer, it can improve the anti-photoaging effect of the polymer, has excellent light stabilization effects on polyolefins and polyamides, has a better anti-aging effect, and has a good compounding effect with ultraviolet absorbers.

[0032] A further scheme, as a preferred implementation, R1 is the element O or N; R2 is selected from H, oxygen free radical, -OH, -Cl, -CH3, octyloxy, allyl and benzyl.

[0033] A further scheme, as a specific implementation, R1 is the element O; R2 is H or -CH3.

[0034] The second object of the present invention is to provide a preparation method of the hindered amine light stabilizer as described in the above scheme, including the following steps:

[0035] (1) React the compound represented by formula (II) and the hindered amine piperidinol represented by formula (III) in a solvent under catalytic conditions to carry out an esterification or transesterification reaction to obtain a crude product; the formula (II) and formula (III) are as follows:

[0036]

[0037]

[0038] Among them, R2 is selected from H, an oxygen free radical, -OH, -Cl, -CH2CN, an alkyl group with 1 to 8 carbon atoms, an alkoxy group with 1 to 8 carbon atoms, a cycloalkoxy group with 5 to 12 a cycloalkoxy group, an alkenyl group with 3 to 6 carbon atoms, an alkyl group with 1 to 3 carbon atoms substituted by benzene; R3 is selected from H or -CH3; R4 is selected from -OH or -NH2;

[0039] (2) Purify the crude product of the compound obtained in step (1) to obtain a pure product.

[0040] In a further embodiment, in step (1), the molar ratio of the compound represented by formula (II) to the hindered amine piperidinol represented by formula (III) is 1:2 - 1:3.

[0041] The present invention defines that the molar ratio of the compound represented by formula (II) to the hindered amine piperidinol represented by formula (III) is in the range of 1:2 - 1:3, which can not only prepare a hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate, but also has a relatively high yield and high product purity.

[0042] In a further embodiment, in step (1), the reaction temperature is 0 - 120 °C;

[0043] Preferably, the reaction temperature is 80 - 120 °C.

[0044] In a further embodiment, in step (1), the volume ratio of the solvent used to the mass of the compound represented by formula (II) is 1 - 45:1; preferably 5 - 20:1.

[0045] In a further embodiment, in step (1), the solvent is selected from one or a mixture of solvents such as tetrahydrofuran, 1,4 - dioxane, acetone, n - heptane, cyclohexane, petroleum ether, toluene, and xylene.

[0046] In a further embodiment, in step (1), the added catalyst is selected from one of tetrabutyl titanate, tetraisopropyl titanate, and p - toluenesulfonic acid.

[0047] For a further solution, in step (2), the method for purifying the crude product of the compound obtained in step (1) includes: first distilling off a part of the reaction solvent from the crude product of the compound, and then cooling for crystallization, filtering, washing, and drying to obtain a pure product.

[0048] For a further solution, in step (2), the temperature for the distillation separation of the crude product of the compound is 90 - 120 °C, and fractional distillation is carried out for a certain time, preferably for 4 h.

[0049] The reaction formula for preparing the hindered amine light stabilizer of the present invention is as follows:

[0050]

[0051] The piperidyl cyclohexanedicarboxylate hindered amine light stabilizer provided by the present invention has two hindered amine piperidyl groups, the functional group density is equivalent to that of Tinuvin 770, the molecular weight is slightly smaller than that of Tinuvin 770, and it has a better effect on the anti-weathering of polymers than Tinuvin 770. The piperidyl cyclohexanedicarboxylate hindered amine light stabilizer product provided by the present invention is a white solid powder.

[0052] The third object of the present invention is to provide the application of the hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate as described in the above solution in the preparation of polymer materials;

[0053] Preferably, it is used in the preparation of polyolefin and polyamide materials.

[0054] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0055] 1. The hindered amine light stabilizer of the present invention containing two piperidyl groups and having a cyclohexane core has good heat resistance. When used as a polymer light stabilizer, it enables the polymer to have better anti-photoaging and anti-weathering effects.

[0056] 2. The preparation method of the hindered amine light stabilizer of the present invention containing two piperidyl groups and having a cyclohexane core has a higher yield, the obtained product has a high purity, and the method is simple, the conditions are easy to achieve, the operation is convenient, and it is convenient for large-scale production, having the prospect of industrial production.

[0057] The following further describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. Description of the Drawings

[0058] The accompanying drawings, as part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. In the drawings:

[0059] Figure 1 : Quantitative nuclear magnetic spectrum of the piperidyl cyclohexanedicarboxylate hindered amine light stabilizer synthesized in Example 1;

[0060] Figure 2 : Curve of the change of carbonyl index with aging time of the PP / sample synthesized in Example 1 and the traditional PP / hindered amine light stabilizer Tinuvin770 sample under the ultraviolet aging condition of 302 nm;

[0061] Figure 3 : Curve of the change of carbonyl index with aging time of the PP / sample synthesized in Example 1 and the traditional PP / hindered amine light stabilizer Tinuvin770 sample under the artificial weathering condition of 340 nm.

[0062] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0063] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0064] Example 1

[0065] Under the condition of room temperature (15 - 25 °C), 16.49 g of 2,2,6,6 - tetramethyl - 4 - piperidinol was dissolved in 150 mL of n - heptane (A), and then 10.0 g of dimethyl 1,4 - cyclohexanedicarboxylate and the catalyst tetra - isopropyl titanate were successively added to (A). The reaction temperature was raised to 93 ± 2 °C, and the mixture was stirred and reacted for 20 hours to obtain an unseparated product. The product was separated and purified according to the following steps: (1) The temperature was raised to 115 ± 2 °C and fractionated for 4 hours; (2) The remaining solvent in the reaction was cooled and crystallized, filtered, washed, and dried to obtain 13.5 g of pure product bis(2,2,6,6 - tetramethylpiperidin - 4 - yl) cyclohexane - 1,4 - dicarboxylate, with a yield of 60.0%. The product is a white solid powder. The nuclear magnetic spectrum of the synthesized piperidyl cyclohexanedicarboxylate hindered amine light stabilizer is as Figure 1 shown, and the mass spectrometry signal m / z is 451.4 ([M + H+ + ) and 473.4 ([M+Na + + ), and the product purity measured by quantitative nuclear magnetic resonance is greater than 98%. The structural formula is:

[0066]

[0067] Example 2

[0068] Under the condition of room temperature (15 - 25 °C), 6.49 g of 1-methyl-2,2,6,6-tetramethyl-4-piperidinol was dissolved in 50 mL of n-heptane (A), and then 3.5 g of dimethyl 1,4-cyclohexanedicarboxylate and the catalyst tetraisopropyl titanate were successively added to (A). The reaction temperature was raised to 93 ± 2 °C, and the reaction was stirred for 20 hours to obtain an unseparated product. The product was separated and purified according to the following steps: (1) The temperature was raised to 115 ± 2 °C and fractionated for 4 hours; (2) The remaining solvent of the reaction was cooled and crystallized, filtered, washed, and dried to obtain 5.1 g of the pure product bis(1,2,2,6,6-pentamethylpiperidin-4-yl) cyclohexane-1,4-dicarboxylate, with a yield of 61.0%. The product is a white solid powder. The structural formula is:

[0069]

[0070] Example 3

[0071] Under the condition of room temperature (15 - 25 °C), 6.49 g of 2,2,6,6-tetramethyl-4-piperidinol was dissolved in 60 mL of cyclohexane (A), and then 4.0 g of dimethyl 1,4-cyclohexanedicarboxylate and the catalyst tetraisopropyl titanate were successively added to (A). The reaction temperature was raised to 83 ± 2 °C, and the reaction was stirred for 20 hours to obtain an unseparated product. The product was separated and purified according to the following steps: (1) The temperature was raised to 95 ± 2 °C and fractionated for 4 hours; (2) The remaining solvent of the reaction was cooled and crystallized, filtered, washed, and dried to obtain 5.4 g of the pure product bis(2,2,6,6-tetramethylpiperidin-4-yl) cyclohexane-1,4-dicarboxylate, with a yield of 61.5%. The product is a white solid powder. The structural formula is as shown in Example 1.

[0072] Example 4

[0073] ​​Under the condition of room temperature (15 - 25 °C), 7.8 g of 2,2,6,6 - tetramethyl - 4 - piperidinol was dissolved in 150 mL of n - heptane (A). Then, 4.0 g of 1,4 - cyclohexanedicarboxylic acid and tetra - isopropyl titanate as the catalyst were successively added to (A). The reaction temperature was raised to 93 ± 2 °C, and the reaction was stirred for 20 hours to obtain an unseparated product. The product was separated and purified according to the following steps: (1) The temperature was raised to 115 ± 2 °C and fractionated for 4 hours; (2) The remaining solvent of the reaction was cooled for crystallization, filtered, washed, and dried to obtain 4.4 g of pure product bis(2,2,6,6 - tetramethylpiperidin - 4 - yl) cyclohexane - 1,4 - dicarboxylate, with a yield of 42.1%. The product is a white solid powder. The structural formula is as shown in Example 1.

[0074] Example 5

[0075] Under the condition of room temperature (15 - 25 °C), 8.1 g of 1 - chloro - 2,2,6,6 - tetramethyl - 4 - piperidinol was dissolved in 150 mL of n - heptane (A). Then, 4.0 g of dimethyl 1,4 - cyclohexanedicarboxylate and tetra - isopropyl titanate as the catalyst were successively added to (A). The reaction temperature was raised to 93 ± 2 °C, and the reaction was stirred for 20 hours to obtain an unseparated product. The product was separated and purified according to the following steps: (1) The temperature was raised to 115 ± 2 °C and fractionated for 4 hours; (2) The remaining solvent of the reaction was cooled for crystallization, filtered, washed, and dried to obtain 7.2 g of pure product bis(2,2,6,6 - tetramethylpiperidin - 4 - yl) cyclohexane - 1,4 - dicarboxylate, with a yield of 69.5%. The product is a white solid powder. The structural formula is:

[0076]

[0077] Example 6

[0078] Under the condition of room temperature (15 - 25 °C), 12.0 g of 1 - octyloxy - 2,2,6,6 - tetramethyl - 4 - piperidinol was dissolved in 150 mL of n - heptane (A). Then, 4.0 g of dimethyl 1,4 - cyclohexanedicarboxylate and tetra - isopropyl titanate as the catalyst were successively added to (A). The reaction temperature was raised to 93 ± 2 °C, and the reaction was stirred for 20 hours to obtain an unseparated product. The product was separated and purified according to the following steps: (1) The temperature was raised to 115 ± 2 °C and fractionated for 4 hours; (2) The remaining solvent of the reaction was cooled for crystallization, filtered, washed, and dried to obtain 9.5 g of pure product bis(2,2,6,6 - tetramethylpiperidin - 4 - yl) cyclohexane - 1,4 - dicarboxylate, with a yield of 67.2%. The product is a white solid powder. The structural formula is:

[0079]

[0080] Example 7

[0081] Under the condition of room temperature (15 - 25 °C), 11.3 g of 1 - octyl - 2,2,6,6 - tetramethyl - 4 - piperidinol was dissolved in 150 mL of n - heptane (A). Then, 4.0 g of dimethyl 1,4 - cyclohexanedicarboxylate and the catalyst tetra - isopropyl titanate were successively added to (A). The reaction temperature was raised to 93 ± 2 °C, and the mixture was stirred and reacted for 20 hours to obtain an unseparated product. The product was separated and purified according to the following steps: (1) The temperature was raised to 115 ± 2 °C and fractionated for 4 hours; (2) The remaining solvent in the reaction was cooled and crystallized, filtered, washed, and dried to obtain 8.6 g of the pure product bis(2,2,6,6 - tetramethylpiperidin - 4 - yl) cyclohexane - 1,4 - dicarboxylate, with a yield of 66.5%. The product is a white solid powder. The structural formula is:

[0082]

[0083] Example 8

[0084] Under the condition of room temperature (15 - 25 °C), 10.8 g of 1 - cyclohexyloxy - 2,2,6,6 - tetramethyl - 4 - piperidinol was dissolved in 150 mL of n - heptane (A). Then, 4.0 g of dimethyl 1,4 - cyclohexanedicarboxylate and the catalyst tetra - isopropyl titanate were successively added to (A). The reaction temperature was raised to 93 ± 2 °C, and the mixture was stirred and reacted for 20 hours to obtain an unseparated product. The product was separated and purified according to the following steps: (1) The temperature was raised to 115 ± 2 °C and fractionated for 4 hours; (2) The remaining solvent in the reaction was cooled and crystallized, filtered, washed, and dried to obtain 8.6 g of the pure product bis(2,2,6,6 - tetramethylpiperidin - 4 - yl) cyclohexane - 1,4 - dicarboxylate, with a yield of 64.2%. The product is a white solid powder. The structural formula is:

[0085]

[0086] Example 9

[0087] The compound prepared in Example 1 and the commercially available Tinuvin 770 were respectively used to prepare polypropylene materials to detect the improvement effect of the compound prepared by the present invention on the anti - ultraviolet aging of polypropylene materials.

[0088] Each experimental group was as follows: Group 1#: Polypropylene + antioxidant (both commercially available), without adding light stabilizer; Different proportions of commercially available Tinuvin 770 were added to Group 2# and Group 3#; Different proportions of the hindered amine light stabilizer prepared in the examples were added to Group 4# and Group 5#. The numbers and basic formulations of each experimental group are shown in Table 1.

[0089] Table 1 Sample numbers and basic formulations

[0090] Sample Number Formulation 1# PPT30S: 99.7%, 0.3% B215 2# PPT30S: 99.4%, 0.3% B215, 0.3% Tinuvin770 3# PPT30S: 99.1%, 0.3% B215, 0.5% Tinuvin770 4# PPT30S: 99.4%, 0.3% B215, 0.3% Compound of Example 1 5# PPT30S: 99.1%, 0.3% B215, 0.5% Compound of Example 1

[0091] Preparation of specimens:

[0092] Pre - mix polypropylene (PPT30S), antioxidant (B215), and light stabilizer (Tinuvin770 or the compound of Example 1) according to the formulation in Table 1. Then add the pre - mix into the mixing chamber of a kneader at 180 °C for melt - blending for 5 min, and take out the sample to cool for standby. Press the sample obtained by melt - blending into a polypropylene film about 50 μm thick for ultraviolet accelerated aging.

[0093] Put the prepared PP film into a CL - 1000 type ultraviolet cross - linker (UVP LLC, USA) ultraviolet aging equipment for aging (UV302nm), and count the carbonyl index of the samples under different aging time conditions. The smaller the carbonyl index, the better the light - stabilizing effect of the light stabilizer or light stabilizer / ultraviolet absorber on polypropylene.

[0094] The aging test results of each experimental group are as Figure 2 shown. The results show that compared with Group 1 without adding light stabilizer, Groups 2 - 5 with added light stabilizers can all improve the light stability of polypropylene. When the addition amount of the light stabilizer is 0.3%, the piperidyl cyclohexanedicarboxylate hindered amine light stabilizer of Example 1 has a slightly better light - stabilizing effect on PP than Tinuvin770. When the addition amount of the light stabilizer is 0.5%, the piperidyl cyclohexanedicarboxylate hindered amine light stabilizer synthesized in Example 1 and Tinuvin770 have comparable light - stabilizing effects on PP.

[0095] Example 10

[0096] Use the compound prepared in Example 1 and commercially available Tinuvin770 respectively in the preparation of polypropylene materials to detect the influence of the compound prepared by the present invention on the mechanical properties of polypropylene materials after artificial weathering.

[0097] The experimental grouping and basic formulation in this test example are the same as those shown in Table 1 of Example 9. The pre - mixing step and preparation method of the PP specimens are the same as those in Example 9.

[0098] Irradiate using a CL - 1000 type ultraviolet cross - linker (UVP LLC, USA). Use a UV - B light source (G8T5E, Ushio, Japan) with a peak of 302 nm, the sample is 15 cm away from the light source, the irradiation intensity is 999900 μJ / cm2, the irradiation process is carried out in an air atmosphere, and the system temperature is about 40 °C.

[0099] Examine the aging resistance of different polypropylene samples using a Q - Lab ultraviolet aging chamber, and the standard is GB / T16422.3 - 2014 / ISO 4892 - 3:2006. The specific conditions are shown in Table 2:

[0100] Table 2 Q-Lab Experimental Conditions

[0101]

[0102] Results:

[0103] As Figure 3 shown, the results indicate that, compared with Group 1# without light stabilizer, Groups 2# - 5# with light stabilizer can all improve the anti-aging effect of polypropylene under artificial weather conditions. When the light stabilizer addition amount is 0.3%, the anti-aging effect of the piperidyl cyclohexanedicarboxylate hindered amine light stabilizer synthesized in Example 1 is better than that of Tinuvin 770. The main reason for the better anti-aging effect of the compound synthesized in Example 1 than Tinuvin 770 is that the content of the hindered amine in the compound synthesized in Example 1 per unit mass is 1.06 times that of Tinuvin 770. When the light stabilizer addition amount is 0.5%, the anti-aging effects of the piperidyl cyclohexanedicarboxylate hindered amine light stabilizer synthesized in Example 1 and Tinuvin 770 are equivalent.

[0104] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to the above-mentioned technical content prompted to be equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. Use of a piperidyl cyclohexanedicarboxylate-containing hindered amine light stabilizer in the preparation of an anti-aging polymer material, characterized in that, The polymer material is a polyolefin or polyamide material; The structural formula of the hindered amine light stabilizer is as shown in the following formula (I):

2. A preparation method of a hindered amine light stabilizer containing piperidyl cyclohexanedicarboxylate, characterized in that, It includes the following steps: (1) React the compound shown in formula (II) and the hindered amine piperidinol shown in formula (III) under catalytic conditions in a solvent to obtain a crude product; the formula (II) and formula (III) are as follows: Wherein, R2 is selected from H; R3 is selected from -CH3; R4 is selected from -OH; The molar ratio of the compound shown in formula (II) to the hindered amine piperidinol shown in formula (III) is 1:2 - 1:3; (2) Purify the crude product of the compound obtained in step (1) to obtain a pure product.

3. The preparation method according to claim 2, wherein In step (1), the reaction temperature is 0 - 120 °C.

4. The preparation method according to claim 3, characterized in that, In step (1), the reaction temperature is 80 - 120 °C.

5. The preparation method according to claim 2, characterized in that, In step (1), the volume ratio of the solvent used to the mass of the compound shown in formula (II) is 1 - 45:

1.

6. The preparation method according to claim 5, wherein, In step (1), the volume ratio of the solvent used to the mass of the compound shown in formula (II) is 5 - 20:

1.

7. The preparation method according to any one of claims 2-6, characterized in that, In step (1), the solvent is selected from one or a mixture of two or more of tetrahydrofuran, 1,4 - dioxane, acetone, n - heptane, cyclohexane, petroleum ether, toluene, and xylene.

8. The preparation method according to any one of claims 2-6, characterized in that, In step (1), the added catalyst is selected from one of tetrabutyl titanate, tetraisopropyl titanate, and p - toluenesulfonic acid.

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