Preparation method and application of multifunctional emulsion type antioxidant

Abstract

This invention belongs to the field of polymer materials and relates to a method for preparing a multifunctional emulsion antioxidant and its application, specifically to an emulsion antioxidant that also absorbs ultraviolet light and its application. A multifunctional emulsion-type antioxidant comprises the following components: a phenolic primary antioxidant, wherein the phenolic primary antioxidant comprises a mixture of p-cresol and dicyclopentadiene copolymer (TH-CPL) and triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] (antioxidant 245); a thioester secondary antioxidant; a UV absorber; a light stabilizer; a nonionic surfactant; and deionized water; wherein the UV absorber is N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidinium (UV-1), and the light stabilizer is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate and 1-methyl-8-(1,2,2,6,6-pentamethyl-4-piperidine) sebacate (292).

Description

Technical Field

[0001] This invention belongs to the field of polymer materials and relates to a method for preparing a multifunctional emulsion antioxidant and its application, specifically to an emulsion antioxidant that also absorbs ultraviolet light and its application. Background Technology

[0002] With the booming development of the landscape decoration industry, polymer-based simulated greenery is widely used in various outdoor scenarios such as park landscaping, commercial streets, and cultural tourism projects. However, the outdoor environment is complex. The combined effects of multiple environmental factors, such as ultraviolet radiation from the sun, oxygen in the atmosphere, temperature fluctuations, and wind and rain erosion, can easily trigger the aging and degradation of polymer materials. This process not only damages the appearance and texture of the decorations but also leads to a decline in their mechanical properties, ultimately shortening their service life. Therefore, single-type or single-function antioxidants are insufficient to meet practical application needs. Developing composite antioxidants that combine antioxidant and ultraviolet protection is a key technical means to solve the aging problem of outdoor polymer-based simulated greenery.

[0003] Patent CN 113832729 A describes a method for creating a washable UV absorber by dissolving organic UV absorbers, antioxidants, and light stabilizers in an organic solvent, followed by adding nanomaterials, polyurethane, and fabric softener and mixing. However, this UV absorber is oil-based. The polymer materials used in outdoor polymer-based simulated greenery, such as PVC and styrene-acrylic latex, are typically aqueous polymers. Ordinary powdered or oil-based antioxidants are prone to problems such as poor solubility, poor dispersion, and easy precipitation in aqueous solutions.

[0004] Emulsion-type antioxidants utilize emulsifiers to encapsulate water-insoluble oil-phase antioxidants into tiny droplets, uniformly dispersing them in water to form a stable oil-in-water (O / W) system, effectively solving the aforementioned problems. Patent CN 101805458 A utilizes a ternary mixture of a primary antioxidant and a secondary antioxidant to create an emulsion-type composite antioxidant for ABS resin polymerization oxidation prevention. However, this emulsion antioxidant lacks UV protection, failing to meet the practical application requirements of outdoor polymer-based simulated greenery. Under UV irradiation, polymer chains are prone to photo-induced oxidative degradation, generating active free radicals and triggering chain reactions, leading to appearance defects such as fading, powdering, and cracking.

[0005] The scientific addition of antioxidants and UV absorbers is a key technological approach to solving the aging problem of outdoor polymer-based simulated decorative items. Antioxidants can effectively block or delay the oxidation chain reaction of materials and inhibit the performance degradation caused by thermo-oxidative degradation through mechanisms such as capturing free radicals, decomposing hydrogen peroxides, or passivating harmful metal ions. UV absorbers can reduce the damage of ultraviolet rays to polymer chains and delay the photoaging process by absorbing and scattering ultraviolet rays or capturing free radicals generated by photodegradation. Summary of the Invention

[0006] To address the aforementioned practical problems, this invention provides a multifunctional emulsion-type antioxidant. It combines a phenolic primary antioxidant and a thioester secondary antioxidant with a phenylmethylimidazolium UV absorber and a light stabilizer to form a composite antioxidant. This is achieved through emulsifier application and high-speed shear mixing to form a homogeneous and stable water-soluble emulsion-type antioxidant. This emulsion-type antioxidant possesses resistance to thermal oxidation, oxygen oxidation, and photo-oxidation, making it suitable for simulated decorative items used outdoors for extended periods. More importantly, the rational combination of the two types of additives produces a synergistic effect, comprehensively resisting the erosion of multiple environmental stresses outdoors, significantly improving the material's weather resistance, and ensuring that the simulated decorative items maintain stable appearance and performance during long-term outdoor use.

[0007] To achieve the above-mentioned objectives, the present invention employs the following technical solution:

[0008] The first aspect of this invention discloses a multifunctional emulsion-type antioxidant, comprising the following components:

[0009] A phenolic primary antioxidant, comprising a mixture of p-cresol and dicyclopentadiene copolymer (TH-CPL) and triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] (antioxidant 245);

[0010] Thioesters are auxiliary antioxidants;

[0011] Ultraviolet absorber;

[0012] Light stabilizers;

[0013] Nonionic surfactants;

[0014] Deionized water;

[0015] The ultraviolet absorber is N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidinium (UV-1), and the light stabilizer is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate and 1-methyl-8-(1,2,2,6,6-pentamethyl-4-piperidine) sebacate (292).

[0016] The structure of the thioester-based auxiliary antioxidant is shown in Formula I:

[0017] Formula I

[0018] In Formula I, R1 and R2 are each independently selected from optional substituted C10-C18 straight-chain or branched alkanes.

[0019] Preferably, the thioester auxiliary antioxidant is dilaurate thiodipropionate (DLTDP) or distearate thiodipropionate (DSTDP).

[0020] Preferably, the nonionic surfactant is selected from one or more of polyvinyl alcohol, polyoxyethylene ether, or polydicarboxylic acid esters.

[0021] Preferably, the components of the multifunctional emulsion antioxidant are as follows, by weight fraction:

[0022] Among phenolic antioxidants, the dosage of TH-CPL is 2%~10%, and the dosage of antioxidant 245 is 2%~5%.

[0023] The dosage of thioester auxiliary antioxidants is 2% to 12%;

[0024] The amount of ultraviolet absorber UV-1 used is 15%~35%;

[0025] The amount of light stabilizer 292 used is 10%~20%;

[0026] The dosage of nonionic surfactant is 2% to 8%;

[0027] The amount of deionized water used is 40%~60%.

[0028] Preferably, the components of the multifunctional emulsion antioxidant are as follows, by weight fraction:

[0029] The dosage of TH-CPL is 3%~8%;

[0030] The dosage of antioxidant 245 is 2%~5%;

[0031] The dosage of thioester auxiliary antioxidants is 3% to 10%;

[0032] The dosage of UV-1 is 20%~30%;

[0033] The amount of light stabilizer 292 used is 10%~15%;

[0034] The dosage of nonionic surfactant is 3%~6%;

[0035] The amount of deionized water used is 45%~55%.

[0036] The second aspect of this invention discloses a method for preparing the above-mentioned multifunctional emulsion antioxidant, comprising the following steps:

[0037] (1) Heat the phenolic primary antioxidant and the thioester secondary antioxidant to above the melting point and mix them evenly to form a composite antioxidant;

[0038] (2) The ultraviolet absorber UV-1 and light stabilizer 292 are heated and stirred at 45~55℃ to obtain a uniform mixture;

[0039] (3) Add the nonionic surfactant to deionized water and heat and stir at 60~70℃ to dissolve it, thus obtaining an emulsifier aqueous solution;

[0040] (4) Add the composite antioxidant from step (1) to the emulsifier aqueous solution from step (3), stir and mix, then cool to 50~60℃, add the mixture from step (2), continue stirring, and then emulsify by high-speed shearing to obtain the emulsion-type antioxidant.

[0041] In step (4):

[0042] After adding the compound antioxidant, stir for 5-15 minutes.

[0043] After cooling to 50~60℃, add the mixture from step (2) and continue stirring for 5~15 minutes;

[0044] The high-speed shear emulsification time is 30-50 minutes;

[0045] The third aspect of this invention discloses the application of the above-mentioned multifunctional emulsion antioxidant in polymer materials, wherein the polymer material is an outdoor polymer-based simulated decorative item.

[0046] The polymer-based simulated decorative items include polyvinyl chloride (PVC) or styrene-acrylic latex-based simulated green plants.

[0047] Compared with the prior art, the beneficial effects of this invention are as follows:

[0048] 1. The present invention combines phenolic main antioxidant (TH-CPL+antioxidant 245), thioester auxiliary antioxidant (DLTDP / DSTDP), ultraviolet absorber (UV-1) and light stabilizer (292) in a specific compound to form a "three-anti" functional emulsion with anti-thermal oxidation, anti-oxygen oxidation and anti-photooxidation.

[0049] Among them, the bisphenol main antioxidant (TH-CPL + antioxidant 245) plays a synergistic role, and the two complement each other in the emulsion system, with a significantly better effect than a single phenol antioxidant; the C10-C18 chain-length thioesters have the best compatibility with the emulsifiers in this system; UV-1 and 292 form a complete system with the antioxidant system, which also inhibits a variety of aging factors.

[0050] 2. The emulsion-type antioxidant prepared by this invention has a small average particle size and remains uniform and stable after being stored at room temperature for six months. The resulting emulsion has excellent storage stability.

[0051] 3. The emulsion-type antioxidant of this invention is added to polymer-based simulated green plants. After UV aging performance testing, this invention reduces color difference by about 40%-50%. The simulated decorations maintain stable appearance and performance during long-term outdoor use and have practical application value. Detailed Implementation

[0052] The technical solution of the present invention will be described in detail below with reference to embodiments, but this does not limit the present invention to the scope of the embodiments described. Process parameters not specified in the embodiments of this application can be performed according to conventional methods, and all raw materials used can be obtained through commercial channels.

[0053] Example 1

[0054] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h until completely dissolved to obtain an emulsifier, denoted as solution 1. 40 g of DLTDP, 20 g of CPL, and 15 g of antioxidant 245 were dissolved and mixed evenly at 95°C, denoted as solution 1. 130 g of ultraviolet absorber UV-1 and 60 g of light stabilizer 292 were mixed evenly at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min. Then, the mixture was cooled to 55°C and solution 3 was added and stirred for 10 min. After the mixture was evenly mixed, it was sheared at high speed for 40 min and then 50 g of deionized water was added. The solid content was measured to be 54.7%.

[0055] Example 2

[0056] 25 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h until completely dissolved to obtain an emulsifier, denoted as solution 1. 45 g of DLTDP, 25 g of CPL, and 15 g of antioxidant 245 were dissolved and mixed evenly at 95°C, denoted as solution 1. 100 g of ultraviolet absorber UV-1 and 65 g of light stabilizer 292 were mixed evenly at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min. Then, the mixture was cooled to 55°C and solution 3 was added and stirred for 10 min. After the mixture was evenly mixed, it was sheared at high speed for 40 min and then 50 g of deionized water was added. The solid content was measured to be 55.1%.

[0057] Example 3

[0058] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h until completely dissolved to obtain an emulsifier, denoted as solution 1. 45 g of DS TDP, 25 g of CPL, and 15 g of antioxidant 245 were dissolved and mixed evenly at 95°C, denoted as solution 1. 100 g of ultraviolet absorber UV-1 and 70 g of light stabilizer 292 were mixed evenly at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min. Then, the mixture was cooled to 55°C and solution 3 was added and stirred for 10 min. After the mixture was evenly mixed, it was sheared at high speed for 40 min and then 50 g of deionized water was added. The solid content was measured to be 54.7%.

[0059] Example 4

[0060] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h until completely dissolved, yielding an emulsifier, denoted as solution 1. 45 g of DS TDP, 30 g of CPL, and 18 g of antioxidant 245 were dissolved and mixed evenly at 95°C, denoted as solution 1. 110 g of ultraviolet absorber UV-1 and 80 g of light stabilizer 292 were mixed evenly at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min, then cooled to 55°C and solution 3 was added and stirred for 10 min. After mixing evenly, the mixture was high-speed sheared and stirred for 40 min, and then 50 g of deionized water was added. The solid content was measured to be 56.1%.

[0061] Example 5

[0062] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h until completely dissolved, yielding an emulsifier, denoted as solution 1. 40 g of DS TDP, 28 g of CPL, and 12 g of antioxidant 245 were dissolved and mixed evenly at 95°C, denoted as solution 1. 130 g of ultraviolet absorber UV-1 and 75 g of light stabilizer 292 were mixed evenly at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min, then cooled to 55°C and solution 3 was added and stirred for 10 min. After mixing evenly, the mixture was high-speed sheared and stirred for 40 min, and then 50 g of deionized water was added. The solid content was measured to be 55.5%.

[0063] Comparative Example 1

[0064] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h to completely dissolve, yielding an emulsifier, denoted as solution 1. 60 g of CPL and 15 g of antioxidant 245 were dissolved and mixed evenly at 95°C, denoted as solution 1. 130 g of ultraviolet absorber UV-1 and 60 g of light stabilizer 292 were mixed evenly at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min, then cooled to 55°C and added back into solution 1 and stirred for 10 min. After mixing evenly, the mixture was high-speed sheared and stirred for 40 min, and then 50 g of deionized water was added to obtain the emulsion-type antioxidant of Comparative Example 1. The difference between Comparative Example 1 and Example 1 is that only the primary antioxidant CPL is added, without the secondary antioxidant DLTDP, and the amount added is equal to the sum of the primary antioxidant CPL and the secondary antioxidant DLTDP in Example 1.

[0065] Comparative Example 2

[0066] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h to completely dissolve it, resulting in an emulsifier, denoted as solution 1. 40 g of DLTDP and 35 g of CPL were dissolved and mixed evenly at 95°C, denoted as solution 1. 130 g of ultraviolet absorber UV-1 and 60 g of light stabilizer 292 were mixed evenly at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min, then cooled to 55°C and solution 3 was added and stirred for 10 min. After mixing evenly, the mixture was sheared at high speed for 40 min and then 50 g of deionized water was added to obtain the emulsion-type antioxidant of Comparative Example 2. The difference between Comparative Example 2 and Example 1 is that antioxidant 245 was not added, but an equal amount of the main antioxidant CPL was used instead of antioxidant 245.

[0067] Comparative Example 3

[0068] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h to completely dissolve it, resulting in an emulsifier, denoted as solution 1. 40 g of DLTDP and 35 g of CPL were dissolved and mixed evenly at 95°C, denoted as solution 1. 190 g of UV absorber UV-1 was heated at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min, then cooled to 55°C and solution 3 was added and stirred for 10 min. After mixing evenly, the mixture was sheared at high speed for 40 min, and then 50 g of deionized water was added to obtain the emulsion-type antioxidant of Comparative Example 2. The difference between Comparative Example 2 and Example 1 is that light stabilizer 292 was not added, while the amount of UV absorber UV-1 was equal to the sum of UV absorber UV-1 and light stabilizer 292 in Example 1.

[0069] Comparative Example 4

[0070] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h to completely dissolve it, resulting in an emulsifier, denoted as solution 1. 40 g of DLTDP and 35 g of CPL were dissolved and mixed evenly at 95°C, denoted as solution 1. 190 g of light stabilizer 292 was heated at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min, then cooled to 55°C and solution 3 was added and stirred for 10 min. After mixing evenly, the mixture was sheared at high speed for 40 min, and then 50 g of deionized water was added to obtain the emulsion-type antioxidant of Comparative Example 2. The difference between Comparative Example 2 and Example 1 is that UV absorber UV-1 was not added, while the amount of light stabilizer 292 was equal to the sum of UV absorber UV-1 and light stabilizer 292 in Example 1.

[0071] Comparative Example 5

[0072] 20 g of polyvinyl alcohol was added to 230 g of deionized water and stirred at 65°C for 2.5 h to completely dissolve it, resulting in an emulsifier, denoted as solution 1. 40 g of DLTDP and 35 g of CPL were dissolved and mixed evenly at 95°C, denoted as solution 1. 130 g of ultraviolet absorber 2-hydroxy-4-n-octyloxybenzophenone (UV-531) and 60 g of light stabilizer 292 were heated at 45°C, denoted as solution 3. Solution 1 was poured into solution 2 and stirred for 10 min, then cooled to 55°C and solution 3 was added and stirred for 10 min. After mixing evenly, the mixture was high-speed sheared and stirred for 40 min, and then 50 g of deionized water was added to obtain the emulsion-type antioxidant of Comparative Example 2. The difference between Comparative Example 2 and Example 1 is that UV-531 is used to replace ultraviolet absorber UV-1, and the amount of light stabilizer 292 is equal to the sum of ultraviolet absorber UV-1 and light stabilizer 292 in Example 1.

[0073] Example 6 Performance Testing

[0074] The emulsion-type antioxidants obtained in Examples 1-5 and Comparative Examples 1-5 were added to polymer-based simulated green plants at the same dosage, and the oxidation induction time (OIT) of the samples was tested using a differential scanning calorimeter according to the national standard GB / T 19466.6. The specific experimental data are as follows:

[0075] Table 1. Differential Scanning Calorimeter Test Results

[0076] Sample Name Oxidation induction time (min) Example 1 50.37 min Example 2 49.83 min Example 3 49.57 min Example 4 48.55 min Example 5 49.71 min Comparative Example 1 20.77 min Comparative Example 2 24.38 min Comparative Example 3 25.19 min Comparative Example 4 22.61 min Comparative Example 5 30.35min

[0077] The data above shows that the oxidation induction time of the emulsions with added antioxidants in Examples 1-5 is significantly longer than that in Comparative Examples 1-5. This is mainly due to the synergistic effect of antioxidants (primary antioxidant + secondary antioxidant) and UV absorbers (light stabilizer + UV absorber). The reasonable combination of the two additives produces a result that is significantly better than that of a single type of additive.

[0078] Comparative Example 1 lacked a thioester auxiliary antioxidant, Comparative Example 2 lacked antioxidant 245, Comparative Example 3 lacked light stabilizer 292, and Comparative Example 4 lacked ultraviolet absorber UV-1. Compared with Example 1, the oxidation induction time of Comparative Examples 1-4 decreased to 20.77 min, 24.38 min, 25.19 min, and 22.61 min, respectively, with a decrease of more than 50%; indicating that the combination of phenolic primary antioxidant (TH-CPL + antioxidant 245), thioester auxiliary antioxidant, ultraviolet absorber UV-1, and light stabilizer 292 used in this invention has a significant improving effect.

[0079] The emulsion-type antioxidants obtained in Examples 1-5 and Comparative Examples 1-5 were added to the polymer-based simulated green plants at the same dosage, and the UV aging resistance of the products was tested according to GB / T 16422.3 "Plastics - Laboratory Light Source Exposure Test Methods - Part 3: Fluorescent Ultraviolet Lamps". The specific experimental data are as follows:

[0080] Table 2 Results of UV aging resistance test

[0081] Sample Name Color difference Example 1 1.4 Example 2 1.4 Example 3 1.5 Example 4 1.6 Example 5 1.5 Comparative Example 1 2.5 Comparative Example 2 2.4 Comparative Example 3 2.7 Comparative Example 4 2.7 Comparative Example 5 2.3

[0082] The experimental data above show that the color difference of the samples in Examples 1-5 after UV aging performance testing was significantly lower than that of Comparative Examples 1-5, indicating that the emulsion-type antioxidant prepared by this patented formula has good antioxidant and UV protection properties.

[0083] The properties of the aqueous emulsions obtained in Examples 1-5 and Comparative Examples 1-5 were tested using the following methods:

[0084] Average particle size: Winner 2009PRO laser particle size analyzer

[0085] Stability: The stability of the above aqueous emulsion was observed by placing it at room temperature for different periods of time.

[0086] Table 3 Performance Test Results

[0087] Sample Name Average particle size D50 (μm) Three months Six months Example 1 1.45 Uniform and stable Uniform and stable Example 2 1.37 Uniform and stable Uniform and stable Example 3 1.41 Uniform and stable Uniform and stable Example 4 1.37 Uniform and stable Uniform and stable Example 5 1.35 Uniform and stable Uniform and stable Comparative Example 1 1.57 Uniform and stable Small amount of sediment Comparative Example 2 1.63 Uniform and stable Small amount of sediment Comparative Example 3 1.66 Uniform and stable Small amount of sediment Comparative Example 4 1.61 Uniform and stable Small amount of sediment Comparative Example 5 1.59 Uniform and stable Small amount of sediment

[0088] The data above show that the emulsion prepared by the present invention has smaller particle size and better stability.

[0089] This invention is not limited to the above-described embodiments. Any changes in shape or structure are within the scope of protection of this invention. The scope of protection of this invention is defined by the appended claims. Those skilled in the art can make various changes, modifications, substitutions, combinations, and simplifications to these embodiments without departing from the principles and essence of this invention. All such changes and simplifications should be considered equivalent substitutions and fall within the scope of protection of this invention.

Claims

1. A multifunctional emulsion-type antioxidant characterized by comprising: Includes the following components: A phenolic primary antioxidant, comprising a mixture of p-cresol and dicyclopentadiene copolymer (TH-CPL) and triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate] (antioxidant 245); Thioesters are auxiliary antioxidants; Ultraviolet absorber; Light stabilizers; Nonionic surfactants; Deionized water; The ultraviolet absorber is N-(ethoxycarbonylphenyl)-N'-methyl-N'-phenylformamidinium (UV-1), and the light stabilizer is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidine) sebacate and 1-methyl-8-(1,2,2,6,6-pentamethyl-4-piperidine) sebacate (292).

2. The multifunctional emulsion-type antioxidant according to claim 1, characterized in that, The structure of the thioester-based auxiliary antioxidant is shown in Formula I: Formula I In Formula I, R1 and R2 are each independently selected from optional substituted C10-C18 straight-chain or branched alkanes.

3. The multifunctional emulsion-type antioxidant according to claim 1 or 2, characterized in that, The thioester-based auxiliary antioxidant is dilaurate thiodipropionate (DLTDP) or distearate thiodipropionate (DSTDP).

4. The multifunctional emulsion-type antioxidant according to claim 1, characterized in that, The nonionic surfactant is selected from one or more of polyvinyl alcohol, polyoxyethylene ether, or polydicarboxylic acid esters.

5. The multifunctional emulsion-type antioxidant according to claim 1, characterized in that, The components of a multifunctional emulsion antioxidant, by weight fraction: Among phenolic antioxidants, the dosage of TH-CPL is 2%~10%, and the dosage of antioxidant 245 is 2%~5%. The dosage of thioester auxiliary antioxidants is 2% to 12%; The amount of ultraviolet absorber UV-1 used is 15%~35%; The amount of light stabilizer 292 used is 10%~20%; The dosage of nonionic surfactant is 2% to 8%; The amount of deionized water used is 40%~60%.

6. The multifunctional emulsion-type antioxidant according to claim 5, characterized in that, The components of a multifunctional emulsion antioxidant, by weight fraction: The dosage of TH-CPL is 3%~8%; The dosage of antioxidant 245 is 2%~5%; The dosage of thioester auxiliary antioxidants is 3% to 10%; The dosage of UV-1 is 20%~30%; The amount of light stabilizer 292 used is 10%~15%; The dosage of nonionic surfactant is 3%~6%; The amount of deionized water used is 45%~55%.

7. The method for preparing the multifunctional emulsion-type antioxidant according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Heat the phenolic primary antioxidant and the thioester secondary antioxidant to above the melting point and mix them evenly to form a composite antioxidant; (2) The ultraviolet absorber UV-1 and light stabilizer 292 are heated and stirred at 45~55℃ to obtain a uniform mixture; (3) Add the nonionic surfactant to deionized water and heat and stir at 60~70℃ to dissolve it, thus obtaining an emulsifier aqueous solution; (4) Add the composite antioxidant from step (1) to the emulsifier aqueous solution from step (3), stir and mix evenly, then cool to 50~60℃, add the mixture from step (2), continue stirring evenly, and then emulsify by high-speed shearing to obtain the emulsion-type antioxidant.

8. The application of the multifunctional emulsion antioxidant according to any one of claims 1 to 6 or the multifunctional emulsion antioxidant prepared by the method according to claim 7 in polymer materials.

9. The application according to claim 8, characterized in that, The polymer material is an outdoor polymer-based simulated decorative item.

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