A glass fiber reinforced biodegradable material and preparation method thereof

Abstract

The present invention discloses a glass fiber reinforced degradable material and a preparation method thereof. The degradable material comprises PBAT, surface esterified long glass fiber, a compatibilizer, talcum powder, an antioxidant and other additives. By grafting ester groups containing benzene rings and butyrate structures on the surface of continuous glass fibers, these structures and the molecular segments of PBAT all contain benzene rings, ester groups, and methylene groups, and the two structures are similar and have good compatibility. The compatibility of surface esterified glass fibers and PBAT is improved. Adding a blend of long glass fibers and PBAT solves the problem of low bending modulus of PBAT materials and improves the tensile strength and demolding performance of the materials. The material is given higher strength.

Description

Technical Field

[0001] The invention belongs to the field of degradable materials, and specifically relates to a long glass fiber reinforced degradable modified material Background Art

[0002] Polybutylene adipate terephthalate, abbreviated as PBAT, is a biodegradable high molecular polyester that has good stretchability and elongation at break while also having good impact resistance and heat resistance. The excellent basic performance coupled with the gradually increasing domestic production capacity has made PBAT one of the hot spots in the research of biodegradable materials at home and abroad.

[0003] CN11849132A introduces a high-strength cross-linked PBAT material and a preparation method thereof, which forms a cross-linked structure in PBAT by introducing a cross-linking agent, thereby increasing the strength of the PBAT material. CN113308094A introduces a PBAT resin and an inorganic filler blended to prepare a PBAT film blowing material with high tensile strength. However, whether it is to increase the cross-linked structure or to fill organic or inorganic mineral powder, the PBAT product is applied to the film blowing material, and the PBAT product is not applied to other fields. CN10336188A introduces a preparation method of a high impact-resistant composite material, but its raw material needs to use PBAT fiber, and its scope of application is limited. CN113337088A introduces a PBAT composite material for injection molding, which can improve the modulus of the material to a certain extent, meet the requirements of injection molding, and have no restrictions on the morphology of the PBAT raw material, but because the traditional twin-screw extrusion process is still used, the fiber retention length is significantly reduced after the fiber is sheared, so the rigidity of the material after molding is insufficient. Therefore, it is necessary to develop a high-rigidity, high-impact degradable composite material that can be applied to the injection molding field.

[0004] In addition, traditional glass fiber modification is to modify the glass fiber surface with titanate or silane coupling agents, which can enhance the interfacial bonding strength between the resin and the glass fiber to a certain extent.

[0005] However, since the molecular chain segments of PBAT contain benzene rings and ester groups, they are not very similar to the organic structures of titanates or silanes, and the two have poor compatibility. Summary of the invention

[0006] The purpose of the present invention is to provide a glass fiber reinforced biodegradable material and a preparation method thereof. The present invention enhances the compatibility of the long glass fiber with PBAT by introducing an ester group containing a benzene ring and a butyl group on the surface of the long glass fiber. The tensile strength of the PBAT material can be significantly enhanced by adding surface esterified modified glass fibers.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] A glass fiber reinforced biodegradable material, comprising the following raw materials in parts by weight:

[0009]

[0010] Wherein, the other additives include one or more of toner, masterbatch or lubricant.

[0011] In some specific embodiments, the melting temperature of the PBAT is 110-160°C. In order to ensure the wetting effect while maintaining relatively good material properties, the melt flow rate is 1-12g / 10min. In some preferred embodiments, the melt flow rate of the degradable material is 2-8g / 10min, more preferably 2.5-4.5g / 10min. In some specific embodiments, the TH 801T product of Blue Mountain Tunhe can be directly used.

[0012] The method for preparing the surface esterified continuous glass fiber of the present invention comprises the following steps:

[0013] (1) After the continuous glass fiber is impregnated with a mixed solution of sulfuric acid, hydrofluoric acid and potassium permanganate, it is washed with a 0.5-3wt% sodium carbonate solution until the pH value reaches 7-9 to obtain a surface hydroxylated continuous glass fiber;

[0014] Preferably, the concentration of sulfuric acid in the mixed solution of step (1) is 0.5-3wt%, the concentration of hydrofluoric acid is 0.5-5wt%, preferably 1-2wt%, and the concentration of potassium permanganate is 0.3-1wt%, preferably 0.3-0.5wt%.

[0015] Preferably, the infiltration temperature of step (1) is 40-70°C, preferably 50-60°C, and the infiltration time is 10 min-4 h, preferably 20-1 h.

[0016] (2) heating the ethanol solution of sodium hydroxide and p-hydroxybenzaldehyde to 60-70° C., soaking and heat-insulating the surface hydroxylated continuous glass fiber obtained in step (1) in the solution, eluting with ethanol, passing the continuous glass fiber through a 0.3-0.8 wt % acetic acid aqueous solution, washing with water until the pH is 6-8, drying at 120-130° C., and then winding for standby use to obtain the surface phenolized continuous glass fiber;

[0017] Preferably, in the step (2), the concentration of sodium hydroxide in the ethanol solution is 0.5-1 wt %, and the concentration of p-hydroxybenzaldehyde is 2-12 wt %, preferably 7-9 wt %.

[0018] Preferably, in step (2), the infiltration time is 10 min-4 h, preferably 20-1 h.

[0019] The reaction formula of step (2) is as follows:

[0020]

[0021] (3) The surface phenolized continuous glass fiber obtained in step (2) is soaked in triethylamine for 3-5 minutes, the glass fiber is reacted with butyryl chloride at -3 to 5°C, soaked in ethanol, washed with water until the pH is 6-8, dried at 120-150°C for 30-40 minutes, and rolled up to obtain a surface esterified continuous glass fiber.

[0022] The reaction formula of step (3) is as follows:

[0023]

[0024] In step (1) of the present invention, continuous glass fiber refers to raw glass fiber yarn that has not been chopped. In some specific embodiments of the present invention, the continuous glass fiber is selected from alkali-free glass fiber yarn rolls, such as alkali-free glass fiber untwisted rovings and alkali-free glass fiber untwisted direct yarns; the monofilament diameter of the continuous glass fiber is 10-20 μm, such as 15 μm, 18 μm; the gap of the continuous glass fiber in this range is appropriate and the strength is moderate; as is well known to those skilled in the art, the produced continuous glass fiber will be surface treated with silane, titanate or aluminate coupling agents before leaving the factory. In some specific embodiments, the commercially available continuous glass fiber with the grade T980 of Taishan Fiberglass can be used.

[0025] In some specific embodiments, the talc has a mesh size of 2500-8000 mesh, preferably 5000 mesh and 8000 mesh. In some specific embodiments, the HTP05L product of Imifabi may be directly used.

[0026] In some specific embodiments, the compatibilizer is selected from one or more of a maleic anhydride grafted degradable material, a styrene-acrylonitrile-maleic anhydride copolymer, or a maleic anhydride grafted thermoplastic polyolefin elastomer.

[0027] In some specific embodiments, the antioxidant includes a primary antioxidant and a secondary antioxidant. In a specific embodiment of the present invention, the primary antioxidant is selected from hindered phenol antioxidants, and the secondary antioxidant is selected from phosphite antioxidants.

[0028] In some specific embodiments, the glass fiber reinforced degradable material may further include a light stabilizer, and the light stabilizer is selected from one or more of a hindered amine light stabilizer, a benzophenone light stabilizer or a benzotriazole light stabilizer.

[0029] The preparation method of the glass fiber reinforced biodegradable material of the present invention comprises the following steps: mixing and extruding the surface esterified continuous glass fiber with the melted PBAT, antioxidant, talcum powder, compatibilizer and other additives, cooling, drying and pelletizing to obtain the glass fiber reinforced biodegradable material. The melting temperature is 110-160°C and the pelletizing length is 3-20mm.

[0030] The present invention grafts ester groups containing benzene rings and butyric acid structures on the surface of continuous glass fibers through a series of reactions. These structures and the molecular chain segments of PBAT all contain benzene rings, ester groups, and methylene groups. The two structures are similar and have good compatibility, thereby improving the compatibility of surface esterified glass fibers and PBAT. DETAILED DESCRIPTION

[0031] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with embodiments.

[0032] The following embodiments are tested by the following methods:

[0033] (1) 23℃ Izod notched impact strength: ISO180;

[0034] (2) Tensile strength: ISO527;

[0035] (3) Injection ejection times: After the injection molding is completed, use the robot to eject the required number of times (each time is 20 seconds)

[0036] The raw material information used in the following examples is as follows:

[0037] PBAT biodegradable plastic: TH 801T, Lanshan Tunhe, melt flow rate is 2.5-4.5g / 10min, Shore hardness is 85A;

[0038] Continuous glass fiber: T980, Taishan Fiberglass, average diameter 18μm;

[0039] Chopped glass fiber: T438H, Taishan Fiberglass, average diameter 18μm;

[0040] Talc: HTP05L, Imifabi, 8000-10000 mesh

[0041] Compatibilizer: CMG5701, Jiayirong;

[0042] Primary antioxidant: 1010, BASF;

[0043] Secondary antioxidant: 168, BASF;

[0044] Light stabilizer: 5585, Xinxiu Chemical;

[0045] Lubricant: Zinc stearate (ZnSt), Jinan Hongke.

[0046] Example 1

[0047] (1) soaking the continuous glass fiber in a mixed solution containing sulfuric acid (0.8 wt %), hydrofluoric acid (1.5 wt %) and potassium permanganate (0.3 wt %) at 60° C. for 40 min, and then washing it with a 2 wt % sodium carbonate solution until the pH value reaches 7, thereby obtaining a surface hydroxylated continuous glass fiber;

[0048] The surface hydroxylated continuous glass fiber is soaked in an ethanol solution containing sodium hydroxide (0.5wt%) and p-hydroxybenzaldehyde (8wt%) at 70°C, and after eluting with ethanol, the continuous glass fiber is passed through a 0.5wt% acetic acid solution, and then rinsed with deionized water until the pH is 7, and then dried at 120°C and rolled up for standby use to obtain a surface phenolic continuous glass fiber;

[0049] After the surface phenolized continuous glass fiber was soaked in triethylamine for 3 minutes, butyryl chloride was added dropwise through a -5°C cold trap, and the temperature was controlled below 0°C. The reacted glass fiber was soaked in ethanol, rinsed with deionized water to a pH of 7, and dried at 150°C for 30 minutes to obtain a surface esterified continuous glass fiber.

[0050] The surface esterified continuous glass fiber was crushed by a universal crusher, and then the test sample was prepared by potassium bromide tableting. The infrared test was carried out by ATR total reflection method. -1 A strong and broad absorption peak characteristic of ester groups was found at 1590 cm -1 There are absorption peaks of aromatic esters at 1711cm -1 A carbonyl peak appears at , so it can be determined that the ester group containing benzene ring is successfully introduced into the glass fiber structure after acid washing, acetalization and acyl chloride esterification.

[0051] (2) Prepare the materials according to the following formula, and the content of each component is as follows:

[0052]

[0053] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; the surface esterified continuous glass fiber is blended and extruded with the molten mixture 1, and a glass fiber modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0054] Example 2

[0055] Prepare the materials according to the following formula, the content of each component is as follows:

[0056]

[0057] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; the surface esterified continuous glass fiber is blended and extruded with the molten mixture 1, and a glass fiber modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0058] Example 3

[0059] (1) soaking the continuous glass fiber in a mixed solution containing sulfuric acid (0.8 wt %), hydrofluoric acid (1.5 wt %) and potassium permanganate (0.3 wt %) at 60° C. for 40 min, and then washing it with a 2 wt % sodium carbonate solution until the pH value reaches 7, thereby obtaining a surface hydroxylated continuous glass fiber;

[0060] The surface hydroxylated continuous glass fiber is soaked in an ethanol solution containing sodium hydroxide (0.5wt%) and p-hydroxybenzaldehyde (8wt%) at 70°C, and after rinsing with ethanol, the continuous glass fiber is passed through a 0.5wt% acetic acid aqueous solution, and then rinsed with deionized water until the pH value is 7, and then dried at 120°C and rolled up for standby use to obtain a surface phenolic continuous glass fiber;

[0061] After the surface phenolized continuous glass fiber was soaked in triethylamine for 3 minutes, butyryl chloride was added dropwise through a -5°C cold trap, and the temperature was controlled below 0°C. The reacted glass fiber was soaked in ethanol, rinsed with deionized water to a pH of 7, and dried at 150°C for 30 minutes to obtain a surface esterified continuous glass fiber.

[0062] (2) Prepare the materials according to the following formula, and the content of each component is as follows:

[0063]

[0064] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; the surface esterified continuous glass fiber is blended and extruded with the molten mixture 1, and a glass fiber modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0065] Example 4

[0066] (1) soaking the continuous glass fiber in a mixed solution containing sulfuric acid (0.9 wt %), hydrofluoric acid (1.2 wt %) and potassium permanganate (0.4 wt %) at 60° C. for 40 min, and then washing it with a sodium carbonate solution having a mass concentration of 2.0 wt % until the pH value reaches 7, thereby obtaining a surface hydroxylated continuous glass fiber;

[0067] The surface hydroxylated continuous glass fiber is soaked in an ethanol solution containing sodium hydroxide (0.7wt%) and p-hydroxybenzaldehyde (9wt%) at 70°C for 3min, and after rinsing with ethanol, the continuous glass fiber is passed through a 0.5wt% acetic acid solution, and then rinsed with deionized water until the pH value is 7, and then dried at 120°C and rolled up for standby use to obtain a surface phenolic continuous glass fiber;

[0068] After the surface phenolized continuous glass fiber was soaked in triethylamine for 3 minutes, butyryl chloride was added dropwise through a -5°C cold trap, and the temperature was controlled below 0°C. The reacted glass fiber was soaked in ethanol, rinsed with deionized water to a pH of 7, and dried at 150°C for 30 minutes to obtain a surface esterified continuous glass fiber.

[0069] (2) Prepare the materials according to the following formula, and the content of each component is as follows:

[0070]

[0071] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; the surface esterified continuous glass fiber is blended and extruded with the molten mixture 1, and a glass fiber modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0072] Example 5

[0073] (1) soaking the continuous glass fiber in a mixed solution containing sulfuric acid (0.9 wt %), hydrofluoric acid (1.4 wt %) and potassium permanganate (0.4 wt %) at 60° C. for 40 min, and then washing it with a sodium carbonate solution having a mass concentration of 2 wt % until the pH value reaches 7, thereby obtaining a surface hydroxylated continuous glass fiber;

[0074] The surface hydroxylated continuous glass fiber is soaked in an ethanol solution containing sodium hydroxide (0.7wt%) and p-hydroxybenzaldehyde (8.5wt%) at 70° C. for 5 minutes, and after eluting with ethanol, the continuous glass fiber is passed through a 0.5wt% acetic acid aqueous solution, and then rinsed with deionized water until the pH value is 7, and then dried at 120° C. and rolled up for standby use to obtain a surface phenolic continuous glass fiber;

[0075] After the surface phenolized continuous glass fiber was soaked in triethylamine for 3 minutes, n-butyryl chloride was added dropwise through a cold trap at -5°C, and the temperature was controlled below 0°C. After the reacted glass fiber was soaked in ethanol, it was rinsed with deionized water until the pH was 7, and then dried at 150°C for 30 minutes to obtain the surface esterified continuous glass fiber.

[0076] (2) Prepare the materials according to the following formula, and the content of each component is as follows:

[0077]

[0078] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; the surface esterified continuous glass fiber is blended and extruded with the molten mixture 1, and a glass fiber modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0079] Example 6

[0080] (1) soaking the continuous glass fiber in a mixed solution containing sulfuric acid (0.9 wt %), hydrofluoric acid (1.2 wt %) and potassium permanganate (0.4 wt %) at 60° C. for 40 min, and then washing it with a sodium carbonate solution having a mass concentration of 2 wt % until the pH value reaches 7, thereby obtaining a surface hydroxylated continuous glass fiber;

[0081] The surface hydroxylated continuous glass fiber is soaked in an ethanol solution containing sodium hydroxide (0.7 wt %) and p-hydroxybenzaldehyde (7.5 wt %) at 70° C., and after rinsing with ethanol, the continuous glass fiber is passed through a 0.5 wt % acetic acid solution, and then rinsed with deionized water until the pH value is 7, and then dried at 120° C. and rolled up for standby use to obtain a surface phenolic continuous glass fiber;

[0082] After the surface phenolized continuous glass fiber was soaked in triethylamine for 3 minutes, butyryl chloride was added dropwise through a -5°C cold trap, and the temperature was controlled below 0°C. The reacted glass fiber was soaked in ethanol, rinsed with deionized water to a pH of 7, and dried at 150°C for 30 minutes to obtain a surface esterified continuous glass fiber.

[0083] (2) Prepare the materials according to the following formula, and the content of each component is as follows:

[0084]

[0085] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; the surface esterified continuous glass fiber is blended and extruded with the molten mixture 1, and a glass fiber modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0086] Comparative Example 1

[0087] (1) The continuous glass fiber T980 was soaked in a mixed solution containing sulfuric acid (0.8wt%), hydrofluoric acid (1.5wt%) and potassium permanganate (0.3wt%) at 60°C for 40 minutes, and then washed with a 2wt% sodium carbonate solution until the pH value reached 7, and then dried and rolled at 120°C; the above-mentioned glass fiber was passed through a 3wt% KH560 solution, kept at 45°C for 30 minutes, and vacuum dried at 60°C for 24 hours to obtain a silane-modified continuous long glass fiber.

[0088] (2) Prepare the materials according to the following formula, and the content of each component is as follows:

[0089]

[0090] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; a silane-modified continuous long glass fiber is blended and extruded with the melted mixture 1, and a glass fiber-modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0091] Comparative Example 2

[0092] Prepare the materials according to the following formula, the content of each component is as follows:

[0093]

[0094] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; a silane-modified continuous long glass fiber is blended and extruded with the melted mixture 1, and a glass fiber-modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0095] Comparative Example 3

[0096] Prepare the materials according to the following formula, the content of each component is as follows:

[0097]

[0098]

[0099] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; T980 is blended and extruded with the molten mixture 1, and a glass fiber modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0100] Comparative Example 4

[0101] Prepare the materials according to the following formula, the content of each component is as follows:

[0102]

[0103] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; T980 is blended and extruded with the molten mixture 1, and a glass fiber modified PBAT composition is obtained after cooling, drying and pelletizing. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0104] Comparative Example 5

[0105] Prepare the materials according to the following formula, the content of each component is as follows:

[0106]

[0107]

[0108] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; short glass fibers are blended and extruded with the melted mixture 1, and then cooled, dried and pelletized to obtain a glass fiber modified PBAT composition. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0109] Comparative Example 6

[0110] Prepare the materials according to the following formula, the content of each component is as follows:

[0111]

[0112] PBAT, a compatibilizer, an antioxidant, talcum powder and a lubricant are mixed to obtain a mixture 1; short glass fibers are blended and extruded with the melted mixture 1, and then cooled, dried and pelletized to obtain a glass fiber modified PBAT composition. The melting temperature is 110-130° C., and the pelletizing length is 8 mm.

[0113] The glass fiber modified degradable material composition obtained above was subjected to the following performance tests, and the test results are shown in Table 1 and Table 2:

[0114] Table 1 Performance table of embodiments 1-6

[0115]

[0116] Table 2 Performance table of comparative examples 1-6

[0117]

[0118] By comparing the data in Table 1 and Table 2, it can be seen that the surface esterified long glass fiber reinforced PBAT material prepared by the method provided by the present invention has a greatly improved tensile strength and a significantly reduced elongation at break compared with the ordinary short glass fiber reinforced PBAT material, the long glass fiber reinforced PBAT material that has not been esterified, and the surface silane modified material. At the same time, it can be found that the surface esterified long glass fiber reinforced PBAT material has more advantages in the injection molding ejection and demolding process. It can be seen that the surface esterified long glass fiber reinforced PBAT material can greatly improve the tensile strength of the material and improve the injection molding performance.

[0119] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A glass fiber reinforced biodegradable material, comprising the following raw materials in parts by weight: The method for preparing the surface esterified continuous glass fiber comprises the following steps: (1) After the continuous glass fiber is impregnated with a mixed solution of sulfuric acid, hydrofluoric acid and potassium permanganate, it is washed with a 0.5-3wt% sodium carbonate solution until the pH value reaches 7-9 to obtain a surface hydroxylated continuous glass fiber; (2) heating the ethanol solution of sodium hydroxide and p-hydroxybenzaldehyde to 60-70° C., soaking and heat-insulating the surface hydroxylated continuous glass fiber obtained in step (1) in the solution, eluting with ethanol, passing the continuous glass fiber through a 0.3-0.8 wt % acetic acid aqueous solution, washing with water until the pH is 6-8, drying at 120-130° C., and then winding for standby use to obtain the surface phenolized continuous glass fiber; (3) The surface phenolized continuous glass fiber obtained in step (2) is soaked in triethylamine for 3-5 minutes, the glass fiber is reacted with butyryl chloride at -3 to 5°C, soaked in ethanol, washed with water until the pH is 6-8, dried at 120-150°C for 30-40 minutes, and rolled up to obtain a surface esterified continuous glass fiber.

2. The degradable material according to claim 1, characterized in that: The invention also contains 0.1-5 parts of other additives; the other additives include one or more of toner, masterbatch or lubricant.

3. The degradable material according to claim 1, characterized in that: The melting temperature of the PBAT is 110-160° C., and the melt flow rate is 1-12 g / 10 min.

4. The degradable material according to claim 1, characterized in that: The invention is prepared from the following raw materials in parts by weight:

5. The degradable material according to claim 2, characterized in that: The dosage of the other additives is 0.1-0.5 parts.

6. The degradable material according to claim 3, characterized in that: The PBAT melt flow rate is 2-8 g / 10 min.

7. The degradable material according to claim 3, characterized in that: The PBAT melt flow rate is 2.5-4.5 g / 10 min.

8. The degradable material according to claim 1, characterized in that: The concentration of sulfuric acid in the mixed solution of step (1) is 0.5-3wt%, the concentration of hydrofluoric acid is 0.5-5wt%, and the concentration of potassium permanganate is 0.3-1wt%.

9. The degradable material according to claim 1, characterized in that: The infiltration temperature of step (1) is 40-70°C, and the infiltration time is 10 min-4 h.

10. The degradable material according to claim 1, characterized in that: In the step (2), the concentration of sodium hydroxide in the ethanol solution is 0.5-1 wt %, and the concentration of p-hydroxybenzaldehyde is 2-12 wt %.

11. The degradable material according to claim 1, characterized in that: In the step (2), the infiltration time is 10 min-4 h.

12. The degradable material according to claim 8, characterized in that: The concentration of the hydrofluoric acid is 1-2 wt %, and the concentration of the potassium permanganate is 0.3-0.5 wt %.

13. The degradable material according to claim 9, characterized in that: The infiltration temperature of step (1) is 50-60°C, and the infiltration time is 20min-1h.

14. The degradable material according to claim 10, characterized in that: The concentration of p-hydroxybenzaldehyde is 7-9 wt %.

15. The degradable material according to claim 11, characterized in that: In the step (2), the infiltration time is 20 minutes to 1 hour.

16. The degradable material according to claim 1, characterized in that: The mesh number of the talc powder is 2500-8000 mesh; the compatibilizer is selected from one or more of maleic anhydride grafted degradable materials, styrene-acrylonitrile-maleic anhydride copolymers or maleic anhydride grafted thermoplastic polyolefin elastomers.

17. The method for preparing the degradable material according to any one of claims 1 to 16, comprising the following steps: The surface esterified continuous glass fiber is mixed with melted PBAT, antioxidant, talcum powder, compatibilizer and other additives, extruded, cooled, dried and pelletized to obtain a glass fiber reinforced biodegradable material; the melting temperature is 110-160° C. and the pelletizing length is 3-20 mm.

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