Light-aging-resistant PBAT functional resin as well as preparation method and application thereof

Abstract

The invention discloses a photoaging-resistant PBAT functional resin, and also discloses a preparation method and an application of the photoaging-resistant PBAT functional resin. The chemical formula of the photoaging-resistant PBAT functional resin provided by the invention is as shown in a formula I in the specification. A TMP structure is introduced into a PBAT molecular chain segment, and PBAT-TMP block copolyester with a stable structure, namely the photoaging-resistant PBAT functional resin, is formed by a chemical copolymerization method. The PBAT-TMP block copolyester can effectively capture free radicals R in polymer degradation chain reaction under the action of illumination, so that the effect of continuously resisting light aging is achieved. The light-aging-resistant PBAT functional resin prepared by the invention has long light-resistant stability and a stable structure. Formula I.

Description

Technical Field

[0001] This invention relates to the field of aging-resistant materials, and more particularly to a light-aging-resistant PBAT functional resin, its preparation method, and its application. Background Technology

[0002] With the development and application of biodegradable materials in recent years, the application fields of PBAT resin are becoming wider and wider, such as shopping bags, express delivery bags, biodegradable agricultural mulch film, food preservation film, stretch film, spinning, non-woven fabric, etc. The UV aging resistance of PBAT-based products is an important indicator affecting the service life of PBAT materials.

[0003] To improve the UV aging resistance of PBAT materials, patent CN116285245B, "A UV-resistant and hydrolysis-resistant PBAT material and its preparation method," describes a UV-resistant PBAT composite material formed by adding UV stabilizers to modified PBAT materials through modification processing. Patent CN114292387B, "A UV-resistant PBAT-based composite material and its preparation method and uses," describes a composite material formed by replacing part of butanediol with isopentyl glycol and / or replacing part of terephthalic acid with phthalic acid, and then adding UV stabilizers through physical blending. Existing technologies for improving UV aging resistance involve adding additives such as carbon black, titanium dioxide, cellulose, UV light stabilizers, and UV absorbers to PBAT resin, followed by physical blending and twin-screw extrusion to create a UV-resistant composite material. The UV-resistant PBAT material processed in this way has relatively poor dispersion and stability of UV-resistant additives in the system, making it impossible to form a long-term stable UV resistance effect. Moreover, the UV-resistant additives will precipitate after being placed in a certain environment for a certain period of time, making it unsuitable for use in materials that come into contact with food-grade materials, and also affecting the performance of the material. Summary of the Invention

[0004] (a) Technical problems to be solved The technical problem to be solved by the present invention is to improve the relatively poor dispersibility and stability of current UV-resistant additives in the system, which makes it impossible to form a long-term stable UV resistance effect, and the problem that UV-resistant additives will precipitate after being placed in a certain environment for a certain period of time.

[0005] (II) Technical Solution To address the aforementioned technical problems, this invention provides a light-resistant PBAT functional resin, its preparation method, and its application. The technical solution is as follows: A light-resistant PBAT functional resin, with the chemical formula shown in Formula I: Formula I; Wherein, the molar ratio of n:m:x is (40-50):(50-55):(1-10), and the weight-average molecular weight of the photo-aging resistant PBAT functional resin is 80,000-150,000 g / mol.

[0006] This invention provides a method for preparing a light-resistant PBAT functional resin, comprising the following steps: S1. Esterification reaction of terephthalic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol to synthesize ester 3; Ester 3 S2. Esterification of terephthalic acid and 1,4-butanediol yields ester 1; S3. Adipic acid and 1,4-butanediol undergo an esterification reaction to yield ester 2; S4. The esterified compound 1, the esterified compound 2, and the esterified compound 3 are added to a polycondensation reactor to carry out a polycondensation reaction, thereby obtaining the light-resistant PBAT functional resin. The molar ratio of the esterified compound 1, the esterified compound 2, and the esterified compound 3 is (45-50):(50-55):(1-10).

[0007] In a preferred embodiment of the present invention, step S1 includes: S1.1 Terephthalic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol are added to the esterification reactor, along with a catalyst and a stabilizer; wherein the molar ratio of terephthalic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol is (1-1.1):(1-1.1).

[0008] S1.2 Nitrogen gas was purged in the reactor, the temperature was increased, and the esterification reaction continued until the esterified water stopped flowing out. The reaction ended, and esterified compound 3 was obtained.

[0009] In step S1.1, the catalyst is selected from one or more combinations of titanium catalysts, including tetrabutyl titanate, isopropyl titanate, tetraisopropyl titanate, tetraisobutyl titanate, and tetraisooctyl titanate.

[0010] The stabilizer is selected from one or more of the following: triphenyl phosphite, diphenyl octyl phosphite, diphenyl decyl phosphite, tri(nonylphenyl) phosphite, triphenyl phosphate, and triethyl phosphate.

[0011] The catalyst dosage is 500ppm-3000ppm of the mass of terephthalic acid; the stabilizer dosage is 500ppm-2000ppm of the mass of terephthalic acid.

[0012] In step S1.2, the final temperature inside the reactor is raised to 235°C, and the vacuum pump is turned on to evacuate to a low pressure of 30KPa-70KPa.

[0013] In a preferred embodiment of the present invention, step S2 specifically includes: S2.1 Terephthalic acid and 1,4-butanediol are added to esterification reactor 1, and titanium catalyst is added.

[0014] S2.2 Heat the esterification reactor 1 and turn on the vacuum pump to obtain esterified product 1 through the esterification reaction.

[0015] In step 2.1, the catalyst is selected from one or more combinations of titanium catalysts, including tetrabutyl titanate, isopropyl titanate, tetraisopropyl titanate, tetraisobutyl titanate, and tetraisooctyl titanate.

[0016] In step S2.1, the stabilizer is selected from one or more of the following: triphenyl phosphite, diphenyl octyl phosphite, diphenyl decyl phosphite, tri(nonylphenyl) phosphite, triphenyl phosphate, and triethyl phosphate.

[0017] In step S2.1, terephthalic acid and 1,4-butanediol are added to esterification reactor 1 in a molar ratio of 1:(1.1-2), and titanium catalyst is added at 500ppm-3000ppm of the mass of terephthalic acid.

[0018] In step S2.2, the esterification reactor 1 is heated to 225°C, the vacuum pump is turned on to draw the pressure to a low pressure (30KPa-70KPa), the reflux tower cooling water temperature is (130°C-150°C), and esterification is carried out for 120 minutes.

[0019] In a preferred embodiment of the present invention, step S3 specifically includes: S3.1 Add adipic acid and 1,4-butanediol to esterification reactor 2, and add titanium catalyst and stabilizer.

[0020] S3.2 Heat the esterification reactor 2 and turn on the vacuum pump to obtain esterified product 2 through the esterification reaction.

[0021] In step S3.1, the catalyst is selected from one or more combinations of titanium catalysts, including tetrabutyl titanate, isopropyl titanate, tetraisopropyl titanate, tetraisobutyl titanate, and tetraisooctyl titanate.

[0022] In step S3.1, the stabilizer is selected from one or more of the following: triphenyl phosphite, diphenyl octyl phosphite, diphenyl decyl phosphite, tri(nonylphenyl) phosphite, triphenyl phosphate, and triethyl phosphate.

[0023] In step S3.1, adipic acid and 1,4-butanediol are added to the esterification reactor 2 in a molar ratio of 1:(1.1-2), and titanium catalyst is added at a mass of (500ppm-2000ppm) of adipic acid, and stabilizer is added at a mass of (500ppm-2000ppm) of adipic acid.

[0024] In step S3.2, the esterification reactor 2 is heated to 200°C, the vacuum pump is turned on to draw the pressure to a low pressure (30KPa-70KPa), the reflux tower cooling water temperature is (130°C-150°C), and esterification is carried out for 120 minutes.

[0025] In a preferred embodiment of the present invention, step S4 specifically includes: The esterified compounds 1 and 2 are transferred to a polycondensation reactor, and the esterified compound 3 is added. Tetraisobutyl titanate catalyst and crosslinking agent are added. After nitrogen purging, the polycondensation reactor is heated, and the stirring and vacuum pump are turned on. The polycondensation reaction yields PBAT functional resin resistant to light aging.

[0026] The crosslinking agent is selected from one or more combinations of malic acid, sorbitol, pentaerythritol, glycerol, and citric acid.

[0027] The catalyst tetraisobutyl titanate is added at a concentration of 200ppm-500ppm of the total mass of all esterified products in the reactor, and the crosslinking agent is added at a concentration of 200ppm-1000ppm of the total mass of esterified products in the reactor.

[0028] This invention also provides an application of light-resistant PBAT functional resin in bags, films, spinning, and nonwoven fabrics.

[0029] (III) Beneficial Effects The above-described technical solution of the present invention has the following advantages: 1. This invention introduces PBAT molecular chains into the TMP structure and forms a structurally stable PBAT-TMP block copolyester through chemical copolymerization. The PBAT-TMP block copolyester can effectively capture free radicals R in the polymer degradation chain reaction under light irradiation, thereby achieving a continuous photo-aging resistance effect.

[0030] TMP structural schematic 2. Compared with traditional technologies for improving UV resistance, such as adding carbon black, titanium dioxide, cellulose, UV stabilizers, and UV absorbers to PBAT resin and processing them through physical blending and twin-screw extrusion, this invention has a stable structure, does not precipitate small molecule additives, saves more raw material and processing costs, and can be applied to materials with food contact requirements.

[0031] 3. The light-resistant PBAT functional resin provided by this invention is more environmentally friendly than PBAT with added UV-resistant additives and extrusion processing. It leaves no residue and causes no pollution after biodegradation. Detailed Implementation

[0032] The specific embodiments of the present invention will be described in further detail below with reference to the examples. These examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0033] Example 1 This embodiment provides a photo-aging resistant PBAT functional resin with the following chemical formula, wherein the molar ratio of n:m:x is 47:52:1.

[0034] The preparation method of the light-resistant PBAT functional resin provided in this embodiment is as follows: 1. Add terephthalic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol to the esterification reactor at a molar ratio of 1:1. Add 2000 ppm of tetraisobutyl titanate as a catalyst and 600 ppm of triphenyl phosphite as a catalyst. Purge the reactor with nitrogen, gradually raise the temperature to 235°C, turn on the vacuum pump to a low pressure of 40 kPa, and after esterification for 150 min, stop the esterification water discharge and drain the esterified product 3 for later use.

[0035] 2. Terephthalic acid and 1,4-butanediol were added to esterification reactor 1 at a molar ratio of 1:1.5, and tetraisobutyl titanate catalyst was added at a concentration of 1500 ppm of the total mass of terephthalic acid. The temperature of esterification reactor 1 was raised to 225°C, the vacuum pump was turned on to evacuate to a low pressure of 50 kPa, the reflux tower cooling water temperature was set to 130°C, and esterification was completed after 120 min to obtain esterified product 1.

[0036] 3. Adipic acid and 1,4-butanediol were added to esterification reactor 2 at a molar ratio of 1:1.5. Tetraisobutyl titanate catalyst was added at 1000 ppm of the adipic acid mass, and triphenyl phosphite stabilizer was added at 1200 ppm of the adipic acid mass. The temperature of esterification reactor 2 was raised to 200℃, and the vacuum pump was turned on to evacuate to a low pressure of 50 kPa. The reflux tower cooling water temperature was set to 140℃, and esterification was completed after 120 minutes, yielding esterified product 2.

[0037] 4. Transfer esterified compounds 1 and 2 to a polycondensation reactor, add esterified compound 3, and add tetraisobutyl titanate catalyst at a concentration of 400 ppm of the total mass of all esterified compounds in the reactor. The molar ratio of terephthalic acid-butanediol: adipic acid-butanediol: terephthalic acid-(4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol) added is 47:52:1. Add glycerol crosslinking agent at a concentration of 400 ppm of the total mass of all esterified compounds in the reactor. After nitrogen purging, heat the polycondensation reactor to 230°C, start stirring, and turn on the vacuum pump to a low pressure of 20 kPa. React for 100 min. Then, reduce the vacuum to a negative pressure of 1 kPa, raise the temperature to 235°C, and react until the viscosity reaches 1.6 dL / g before discharging to obtain the light-resistant PBAT functional resin.

[0038] Example 2 This embodiment provides a photo-aging resistant PBAT functional resin with the following chemical formula, wherein the molar ratio of n:m:x is 47:52:1.

[0039] The preparation method of the light-resistant PBAT functional resin provided in this embodiment is as follows: 1. Add terephthalic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol to the esterification reactor at a molar ratio of 1:1. Add 2000 ppm of tetrabutyl titanate as a catalyst and 600 ppm of triphenyl phosphate as a catalyst. Purge the reactor with nitrogen, gradually raise the temperature to 235°C, turn on the vacuum pump to a low pressure of 40 kPa, and after esterification for 150 min, stop the esterification water discharge and drain the esterified product 3 for later use.

[0040] 2. Terephthalic acid and 1,4-butanediol were added to esterification reactor 1 at a molar ratio of 1:1.5, and tetraisobutyl titanate catalyst was added at 1500 ppm of the total mass of terephthalic acid. The temperature of esterification reactor 1 was raised to 225℃, the vacuum pump was turned on to evacuate to a low pressure of 60 kPa, the reflux tower cooling water temperature was 130℃, and esterification was completed after 120 min to obtain esterified product 1.

[0041] 3. Adipic acid and 1,4-butanediol were added to esterification reactor 2 at a molar ratio of 1:1.5. Tetraisobutyl titanate catalyst was added at 1000 ppm of the adipic acid mass, and triphenyl phosphate stabilizer was added at 1200 ppm of the adipic acid mass. The temperature of esterification reactor 2 was raised to 200℃, and the vacuum pump was turned on to evacuate to a low pressure of 50 kPa. The reflux tower cooling water temperature was set to 140℃, and esterification was completed after 120 minutes, yielding esterified product 2.

[0042] 4. Transfer esterified compounds 1 and 2 to a polycondensation reactor, add esterified compound 3, and add tetraisobutyl titanate catalyst at 400 ppm of the total mass of all esterified compounds in the reactor. The molar ratio of terephthalic acid-butanediol: adipic acid-butanediol: terephthalic acid-(4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol) added is 46.5:52:1.5. Add malic acid crosslinking agent at 300 ppm of the total mass of all esterified compounds in the reactor. After nitrogen purging, heat the polycondensation reactor to 230°C, start stirring, and turn on the vacuum pump to a low pressure of 10 kPa. React for 100 min. Then, reduce the vacuum to a negative pressure of 0.5 kPa, raise the temperature to 235°C, and react until the viscosity reaches 1.6 dL / g before discharging to obtain the light-resistant PBAT functional resin.

[0043] Example 3 This embodiment provides a photo-aging resistant PBAT functional resin with the following chemical formula, wherein the molar ratio of n:m:x is 47:52:1.

[0044] The preparation method of the light-resistant PBAT functional resin provided in this embodiment is as follows: 1. Add terephthalic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol to the esterification reactor at a molar ratio of 1:1. Add 2000 ppm of tetrabutyl titanate as a catalyst and 600 ppm of triphenyl phosphate as a catalyst. Purge the reactor with nitrogen, gradually raise the temperature to 235°C, turn on the vacuum pump to a low pressure of 50 kPa, and after esterification for 150 min, stop the esterification water discharge and drain the esterified product 3 for later use.

[0045] 2. Terephthalic acid and 1,4-butanediol were added to esterification reactor 1 at a molar ratio of 1:1.5, and tetraisobutyl titanate catalyst was added at a concentration of 1500 ppm of the total mass of terephthalic acid. The temperature of esterification reactor 1 was raised to 225°C, the vacuum pump was turned on to evacuate to a low pressure of 50 kPa, the reflux tower cooling water temperature was set to 130°C, and esterification was completed after 120 min to obtain esterified product 1.

[0046] 3. Adipic acid and 1,4-butanediol were added to esterification reactor 2 at a molar ratio of 1:1.5. Tetraisobutyl titanate catalyst was added at 1000 ppm of the mass of adipic acid, and triphenyl phosphate stabilizer was added at 1200 ppm of the mass of adipic acid. The temperature of esterification reactor 2 was raised to 200℃, the vacuum pump was turned on to evacuate to a low pressure of 70 kPa, the cooling water temperature of the reflux tower was set to 140℃, and esterification was completed after 120 min to obtain esterified product 2.

[0047] 4. Transfer esterified compounds 1 and 2 to a polycondensation reactor, add esterified compound 3, and add tetraisobutyl titanate catalyst at a concentration of 400 ppm of the total mass of all esterified compounds in the reactor. The molar ratio of terephthalic acid-butanediol: adipic acid-butanediol: terephthalic acid-(4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol) added is 46:52:2. Add citric acid crosslinking agent at a concentration of 400 ppm of the total mass of all esterified compounds in the reactor. After nitrogen purging, heat the polycondensation reactor to 230°C, start stirring, and turn on the vacuum pump to a low pressure of 20 kPa. React for 100 min. Then, reduce the vacuum to a negative pressure of 1 kPa, raise the temperature to 235°C, and react until the viscosity reaches 1.6 dL / g before discharging to obtain the light-resistant PBAT functional resin.

[0048] Comparative Example 1 This comparative example synthesizes a PBAT resin as Comparative Example 1. The preparation steps are as follows: 1. Add terephthalic acid and 1,4-butanediol to esterification reactor 1 at a molar ratio of 1:1.5, and add tetraisobutyl titanate catalyst at 1500 ppm of the total mass of terephthalic acid. Heat esterification reactor 1 to 225°C, turn on the vacuum pump to a low pressure of 50 kPa, and reflux tower cooling water temperature to 130°C. Esterification is completed after 120 min.

[0049] 2. Add adipic acid and 1,4-butanediol to esterification reactor 2 at a molar ratio of 1:1.5. Add tetraisobutyl titanate catalyst at 1500 ppm of adipic acid mass and triphenyl phosphate stabilizer at 1200 ppm of adipic acid mass. Heat esterification reactor 2 to 200℃, turn on the vacuum pump to a low pressure of 70 kPa, and reflux tower cooling water temperature to 140℃. Esterification is completed after 120 minutes.

[0050] 3. Transfer the esterified products from esterification reactor 1 and esterification reactor 2 to a polycondensation reactor. Add tetraisobutyl titanate as a catalyst at 400 ppm of the total mass of all esterified products in the reactor. The molar ratio of terephthalic acid-butanediol to adipic acid-butanediol is 47:53. Add citric acid as a crosslinking agent at 400 ppm of the total mass of all esterified products in the reactor. After purging with nitrogen, heat the polycondensation reactor to 230°C, start stirring, and turn on the vacuum pump to a low pressure of 20 kPa. React for 100 min. Then, reduce the vacuum to a negative pressure of 1 kPa and raise the temperature to 235°C. React until the viscosity reaches 1.6 dL / g, then discharge the product.

[0051] Comparative Example 2 In this comparative example, the PBAT resin produced in Comparative Example 1 and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol were added to a twin-screw extruder at a mass ratio of 98.5:1.5 and extruded and granulated to form Comparative Example 2.

[0052] Comparative Example 3 In this comparative example, the PBAT resin produced in Comparative Example 1 and the light stabilizer UV622 were added to a twin-screw extruder at a mass ratio of 98:1.5 and extruded and granulated to form Comparative Example 3.

[0053] Comparative Example 4 In this comparative example, the PBAT resin produced in Comparative Example 1, the light stabilizer UV622, and the ultraviolet light absorber UV326 were added to a twin-screw extruder at a mass ratio of 98:1:0.5 and extruded and granulated to form Comparative Example 4.

[0054] Performance testing The physicochemical properties of the functional resin materials provided in the above embodiments and comparative examples were tested. Details are as follows.

[0055] 1. The blown film was processed to a thickness of 0.01 mm. The tensile properties and artificial climate aging tests (xenon lamp aging tests) were performed according to GB / T35795-2017. The results are shown in Table 1.

[0056] Table 1 Comparison of artificial climate aging before and after 1. The light-resistant PBAT in Examples 1, 2, and 3 have basically the same initial mechanical properties as the conventional PBAT in Comparative Example 1. The performance loss rate after artificial weathering is low, and they already have high light-resistant performance. Furthermore, with the increase of 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol content, the performance loss rate after artificial weathering is even lower, and the light-resistant performance is even better.

[0057] 2. Comparative Example 2 data shows that adding 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol to PBAT via twin-screw blending extrusion does not provide anti-aging benefits.

[0058] 3. Comparative Examples 3 and 4 show that the addition of light stabilizers UV622 and UV944 through twin-screw blending extrusion provides certain resistance to photoaging, but the resistance to photoaging is worse than that of Examples 1, 2, and 3.

[0059] 4. Comparative Example 5 showed some improvement in light aging resistance after increasing the UV944 content to 2% by twin-screw co-extrusion, but the light aging resistance was worse than that of Examples 1, 2, and 3.

[0060] II. The membrane material was tested according to GB4806.7-2016 for ethanol migration / potassium permanganate consumption, and the results are shown in Table 2.

[0061] Table 2 1. In Examples 1, 2, and 3, the light-aging resistant PBAT showed no significant increase in ethanol migration and potassium permanganate consumption compared to the conventional PBAT in Comparative Example 1, and met the requirements for food contact.

[0062] 2. In Comparative Examples 2, 3, 4, and 5, the addition of light stabilizers via twin-screw co-extrusion significantly increased ethanol migration and potassium permanganate consumption. Furthermore, the ethanol migration and potassium permanganate consumption increased with increasing light stabilizer content, failing to meet food contact requirements.

[0063] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. For the embodiments of the method, relevant parts can be referred to the description of the device embodiments (as appropriate). The present invention is not limited to the specific steps and structures described above. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A light-aging resistant PBAT functional resin, characterized in that, The chemical formula is shown in Formula I: Formula I; Wherein, the molar ratio of n:m:x is (40-50):(50-55):(1-10); The weight-average molecular weight of the photo-aging resistant PBAT functional resin is 80,000-150,000 g / mol.

2. A method for preparing the photo-aging resistant PBAT functional resin according to claim 1, characterized in that, Including the following steps: S1. Esterification reaction of terephthalic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol to synthesize ester 3; Ester 3 S2. Esterification of terephthalic acid and 1,4-butanediol yields ester 1; S3. Adipic acid and 1,4-butanediol undergo an esterification reaction to yield ester 2; S4. The esterified compound 1, the esterified compound 2, and the esterified compound 3 are added to a polycondensation reactor to carry out a polycondensation reaction, thereby obtaining the light-resistant PBAT functional resin. The molar ratio of the esterified compound 1, the esterified compound 2, and the esterified compound 3 is (45-50):(50-55):(1-10).

3. The preparation method according to claim 2, characterized in that, Step S1 includes: S1.1 Terephthalic acid and 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol are added to the esterification reactor, along with a catalyst and a stabilizer; wherein the molar ratio of terephthalic acid to 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol is (1-1.1):(1-1.1). S1.2 Nitrogen gas was purged in the reactor, the temperature was increased and the reaction was carried out until the esterification water stopped flowing out. The reaction was then completed and esterified product 3 was obtained. In step S1.1, the catalyst is selected from one or more combinations of titanium catalysts, including tetrabutyl titanate, isopropyl titanate, tetraisopropyl titanate, tetraisobutyl titanate, and tetraisooctyl titanate. The stabilizer is selected from one or more of the following: triphenyl phosphite, diphenyl octyl phosphite, diphenyl decyl phosphite, tri(nonylphenyl) phosphite, triphenyl phosphate, and triethyl phosphate.

4. The preparation method according to claim 2, characterized in that, The specific steps in S2 include: S2.1 Add terephthalic acid and 1,4-butanediol to esterification reactor 1, and add titanium catalyst; S2.2 Heat the esterification reactor 1 and turn on the vacuum pump to obtain esterified product 1 through the esterification reaction.

5. The preparation method according to claim 2, characterized in that, The specific steps in S3 include: S3.1 Add adipic acid and 1,4-butanediol to esterification reactor 2, and add titanium catalyst and stabilizer; S3.2 Heat the esterification reactor 2 and turn on the vacuum pump to obtain esterified product 2 through the esterification reaction.

6. The preparation method according to claim 2, characterized in that, The specific steps in S4 include: The esterified compounds 1 and 2 are transferred to a polycondensation reactor, and the esterified compound 3 is added. Tetraisobutyl titanate catalyst and crosslinking agent are added. After nitrogen purging, the polycondensation reactor is heated, and the stirring and vacuum pump are turned on. The polycondensation reaction yields PBAT functional resin resistant to light aging.

7. The preparation method according to claim 4, characterized in that, The titanium catalyst is selected from one or more combinations of tetrabutyl titanate, isopropyl titanate, tetraisopropyl titanate, and tetraisobutyl titanate.

8. The preparation method according to claim 5, characterized in that, The titanium catalyst is selected from one or more combinations of tetrabutyl titanate, isopropyl titanate, tetraisopropyl titanate, and tetraisobutyl titanate. The stabilizer is selected from one or more of the following: triphenyl phosphite, diphenyl octyl phosphite, diphenyl decyl phosphite, tri(nonylphenyl) phosphite, triphenyl phosphate, and triethyl phosphate.

9. The preparation method according to claim 6, characterized in that, The crosslinking agent is selected from one or more combinations of malic acid, sorbitol, pentaerythritol, glycerol, and citric acid.

10. The application of the light-resistant PBAT functional resin as described in claim 1 in bags, films, spinning, and nonwoven fabrics.

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