Hydrolysis-resistant poly (butylene succinate) and preparation method thereof

Abstract

The invention discloses hydrolysis-resistant poly (butylene succinate) and a preparation method thereof, and belongs to the technical field of high polymer materials, the preparation method of the hydrolysis-resistant poly (butylene succinate) comprises the following steps: (1) uniformly mixing succinic acid, butanediol and hydroxyethyl methylacrylate, and carrying out esterification reaction to obtain an esterification product; (2) adding an initiator into the esterification product, and carrying out addition reaction to obtain an addition product; and (3) adding a catalyst and a stabilizer into the addition product, carrying out polycondensation reaction, cooling, and pelletizing to obtain the hydrolysis-resistant poly (butylene succinate). According to the invention, hydroxyethyl methylacrylate not only has a carbon-carbon double bond for an addition reaction, but also has a hydroxyl group for an esterification reaction; the succinic acid, the butanediol and the hydroxyethyl methylacrylate are subjected to esterification, double-bond addition and condensation polymerization to realize ternary polymerization, so that the hydrolysis resistance of the poly (butylene succinate) is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to hydrolysis-resistant polybutylene succinate and a preparation method thereof. Background Art

[0002] Polybutylene succinate is a typical biodegradable resin with good mechanical properties. Its physical and chemical properties are adaptable to injection molding, extrusion, blow molding and other preparation processes. However, it has the problem of poor hydrolysis stability during the production process, which seriously affects the shelf life of polybutylene succinate products and limits the downstream processing and application of this resin product.

[0003] Therefore, how to develop hydrolysis-resistant polybutylene succinate and achieve the production of polybutylene succinate products with controllable shelf life has become a technical problem to be overcome.

[0004] In view of this, this application is filed. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a hydrolysis-resistant polybutylene succinate and a preparation method thereof. The polybutylene succinate has excellent hydrolysis resistance.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0008] (1) uniformly mixing succinic acid, butanediol and hydroxyethyl methacrylate, and subjecting them to an esterification reaction to obtain an esterification product;

[0009] (2) adding an initiator to the esterification product to carry out an addition reaction to obtain an addition product;

[0010] (3) adding a catalyst and a stabilizer to the addition product to carry out a polycondensation reaction, cooling, and pelletizing to obtain hydrolysis-resistant polybutylene succinate.

[0011] The invention creatively uses succinic acid (SA): butanediol (BDO): hydroxyethyl methacrylate (HEMA) as raw materials, and obtains the polybutylene succinate (PBS) through esterification, addition polycondensation and final polycondensation reaction, wherein tetrabutyl titanate is used as a catalyst, triphenyl phosphate is used as a stabilizer, and an initiator is tert-butyl perbenzoate. On the basis of the direct esterification preparation of the traditional polybutylene succinate (PBS), a third monomer hydroxyethyl methacrylate (HEMA) is added to carry out addition polymerization reaction to form a micro-crosslinking structure, which can enhance the mechanical properties of the polybutylene succinate (PBS), and can especially play a capping effect, thereby reducing the hydrolysis aging of the polybutylene succinate (PBS).

[0012] The present invention creatively utilizes hydroxyethyl methacrylate (HEMA) which has both carbon-carbon double bonds for addition reaction and hydroxyl groups for esterification reaction; succinic acid (SA), butanediol (BDO) and hydroxyethyl methacrylate (HEMA) are subjected to esterification, double bond addition and polycondensation reactions to achieve ternary copolymerization; compared with polybutylene succinate produced by a conventional direct esterification method, the preparation method of the present invention performs a double bond addition reaction to produce a micro-crosslinked structure of the copolymer, which can improve the mechanical properties of the polybutylene succinate on the one hand, and can also play an end-capping effect to reduce polymer hydrolysis, thereby solving the hydrolysis aging problem of the polybutylene succinate, and the synthesized polymer has a higher molecular weight.

[0013] Wherein, the reaction principle involved in the present invention is as follows:

[0014]

[0015] As a preferred embodiment of the present invention, the molar ratio of succinic acid, butanediol and hydroxyethyl methacrylate is 1: (1.4-1.6): (0.1-0.4). The present invention further improves the hydrolysis resistance of the polybutylene succinate by controlling the molar ratio of succinic acid, butanediol and hydroxyethyl methacrylate within this range. If the amount of hydroxyethyl methacrylate added is too low, the hydrolysis resistance of the polybutylene succinate is almost not improved. If the amount of hydroxyethyl methacrylate added is too much, the melt viscosity in the addition polymerization reactor changes greatly, blocking the equipment pipeline.

[0016] As a preferred embodiment of the present invention, the carboxyl content of the esterification product is 300-400 mol / t.

[0017] As a preferred embodiment of the present invention, the temperature of the esterification reaction is 170-180°C.

[0018] As a preferred embodiment of the present invention, the mass ratio of the initiator to the esterification product is (200-300 ppm): 1, and the initiator includes at least one of cumene hydroperoxide, tert-butyl isononanoate peroxide, diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate and tert-butyl perbenzoate.

[0019] As a preferred embodiment of the present invention, the temperature of the addition reaction is 170-180° C., and the reaction time is 0.5-2 h.

[0020] As a preferred embodiment of the present invention, the mass ratio of the catalyst, stabilizer and addition product is (50-60 ppm): (200-300 ppm): 1.

[0021] As a preferred embodiment of the present invention, the catalyst comprises at least one of tetrabutyl titanate, tetramethyl titanate, and tetraisopropyl titanate;

[0022] The stabilizer includes at least one of tris(2,4-di-tert-butylphenyl)phosphite, tris(nonylphenyl)phosphite, and diisooctylphenyl phosphite.

[0023] As a preferred embodiment of the present invention, the temperature of the polycondensation reaction is 230-235° C., and the time is 4-5 hours.

[0024] The present invention also provides a hydrolysis-resistant polybutylene succinate, which is prepared by the above-mentioned preparation method.

[0025] The beneficial effects of the present invention are as follows: (1) the present invention uses succinic acid (SA): butanediol (BDO): hydroxyethyl methacrylate (HEMA) as raw materials, and obtains the poly(butylene succinate) through esterification, addition polycondensation, and final polycondensation reaction, wherein tetrabutyl titanate is used as a catalyst, triphenyl phosphate is used as a stabilizer, and the initiator is tert-butyl perbenzoate. On the basis of the direct esterification method of the traditional poly(butylene succinate) (PBS), a third monomer hydroxyethyl methacrylate (HEMA) is added to carry out addition polymerization reaction to form a micro-crosslinking structure, which can enhance the mechanical properties of the poly(butylene succinate) (PBS), and can especially play a capping effect and reduce the hydrolysis aging of the poly(butylene succinate) (PBS). (2) The present invention utilizes hydroxyethyl methacrylate (HEMA) which has both carbon-carbon double bonds that can undergo addition reactions and hydroxyl groups that can undergo esterification reactions; succinic acid (SA), butanediol (BDO) and hydroxyethyl methacrylate (HEMA) are subjected to esterification, double bond addition, and polycondensation reactions to achieve ternary copolymerization; compared with polybutylene succinate produced by the conventional direct esterification method, the preparation method of the present invention performs a double bond addition reaction to produce a micro-crosslinked structure of the copolymer, which can improve the mechanical properties of polybutylene succinate on the one hand, and on the other hand, can have an end-capping effect to reduce polymer hydrolysis, thereby solving the hydrolysis aging problem of polybutylene succinate, and the synthesized polymer has a higher molecular weight. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0027] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0028] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0029] In the present application, there is no particular limitation on the specific dispersion and stirring treatment methods.

[0030] Unless otherwise specified, the components, raw materials or instruments used in the embodiments and comparative examples of the present invention are all commercially available raw materials or instruments, and the components and raw materials used in each parallel experiment are all of the same kind.

[0031] The following examples are provided to facilitate understanding of the present invention. These examples are not provided to limit the scope of the claims.

[0032] Example 1

[0033] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0034] (1) Succinic acid, butanediol, and hydroxyethyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.2 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content reached 310 mol / t to obtain an esterified product;

[0035] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 250 ppm:1;

[0036] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 55 ppm:250 ppm:1.

[0037] Example 2

[0038] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0039] (1) Succinic acid, butanediol, and hydroxyethyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.1 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content reached 310 mol / t to obtain an esterified product;

[0040] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 250 ppm:1;

[0041] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 55 ppm:250 ppm:1.

[0042] Example 3

[0043] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0044] (1) Succinic acid, butanediol, and hydroxyethyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.4 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content reached 310 mol / t to obtain an esterified product;

[0045] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 250 ppm:1;

[0046] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 55 ppm:250 ppm:1.

[0047] Example 4

[0048] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0049] (1) Succinic acid, butanediol, and hydroxyethyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.2 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content reached 310 mol / t to obtain an esterified product;

[0050] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 200 ppm:1;

[0051] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 60ppm:200ppm:1.

[0052] Example 5

[0053] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0054] (1) Succinic acid, butanediol, and hydroxyethyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.2 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content reached 310 mol / t to obtain an esterified product;

[0055] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 300 ppm:1;

[0056] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 50 ppm:300 ppm:1.

[0057] Comparative Example 1

[0058] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0059] (1) Succinic acid, butanediol, and hydroxyethyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.05 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content reached 310 mol / t to obtain an esterified product;

[0060] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 250 ppm:1;

[0061] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 55 ppm:250 ppm:1.

[0062] Comparative Example 2

[0063] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0064] (1) Succinic acid, butanediol, and hydroxyethyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.6 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content reached 310 mol / t to obtain an esterified product;

[0065] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 250 ppm:1;

[0066] The viscosity of Comparative Example 2 after the addition reaction was too high, and the polycondensation reaction of step (3) of Example 1 could not be carried out.

[0067] Comparative Example 3

[0068] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0069] (1) Succinic acid, butanediol, and ethyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.2 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction, and the esterification reaction was carried out until the carboxyl content was 310 mol / t to obtain an esterified product;

[0070] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 250 ppm:1;

[0071] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 55 ppm:250 ppm:1.

[0072] Comparative Example 4

[0073] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0074] (1) Succinic acid, butanediol and trimethylolpropane were mixed uniformly at a molar ratio of 1:1.5:0.2 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content was 310 mol / t to obtain an esterified product;

[0075] (2) Tetrabutyl titanate and triphenyl phosphate are added to the esterification product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and esterification product is 55ppm:250ppm:1.

[0076] Comparative Example 5

[0077] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0078] (1) Succinic acid, butanediol, and hydroxypropyl methacrylate were mixed uniformly at a molar ratio of 1:1.5:0.2 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction. The esterification reaction was carried out until the carboxyl content reached 310 mol / t to obtain an esterified product;

[0079] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 250 ppm:1;

[0080] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 55 ppm:250 ppm:1.

[0081] Comparative Example 6

[0082] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0083] (1) Succinic acid and butanediol were mixed uniformly at a molar ratio of 1:1.5 under nitrogen protection at 80° C., and the temperature was raised to 170° C. for esterification reaction, and the esterification reaction was carried out until the carboxyl content was 310 mol / t to obtain an esterification product;

[0084] (2) Tetrabutyl titanate and triphenyl phosphate are added to the esterification product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and esterification product is 55ppm:250ppm:1.

[0085] Comparative Example 7

[0086] A method for preparing hydrolysis-resistant polybutylene succinate comprises the following steps:

[0087] (1) Succinic acid and butanediol were mixed uniformly at a molar ratio of 1:1.5 under nitrogen protection at 80°C, and the temperature was raised to 170°C for esterification reaction. The esterification reaction lasted for 1 hour, and then hydroxyethyl methacrylate was added and the esterification reaction was carried out until the carboxyl content was 310 mol / t to obtain an esterified product;

[0088] (2) adding tert-butyl perbenzoate to the esterification product, and performing an addition reaction at 170° C. for 0.5 h to obtain an addition product; the mass of the tert-butyl perbenzoate and the esterification product is 250 ppm:1;

[0089] (3) Tetrabutyl titanate and triphenyl phosphate are added to the addition product, and polycondensation reaction is carried out at 230° C. under vacuum of 1 mbar until the melt viscosity is 1.6-1.7 dL / g, pelletized, and dried at 80° C. for 3 hours to obtain hydrolysis-resistant polybutylene succinate. The mass ratio of tetrabutyl titanate, triphenyl phosphate, and addition product is 55 ppm:250 ppm:1.

[0090] Test Case

[0091] The hydrolysis resistance is tested according to the following test method:

[0092] The hydrolysis-resistant polybutylene succinate was tested for the melt index of the slices according to ISO 1133 thermoplastic melt mass flow rate (MFR) standard.

[0093] Step 1: Place the hydrolysis-resistant polybutylene succinate slices in a constant temperature and humidity chamber, set the temperature to 60°C and the humidity to 100%, and place them in this environment for 72 hours;

[0094] Step 2: After 72 hours of hydrolysis, the slices were placed in a vacuum drying oven at 60°C for 24 hours;

[0095] Step 3: Test the change of melt index at 190℃ and 2.16kg, and calculate the hydrolysis rate; the calculation formula is as follows:

[0096] Hydrolysis rate = [(melting index of slices after hydrolysis - melting index of slices before hydrolysis) / melting index of slices before hydrolysis] * 100%.

[0097] Table 1

[0098] Hydrolysis rate / % Example 1 26.53 Example 2 32.23 Example 3 25.02 Example 4 32.62 Example 5 25.54 Comparative Example 1 56.78 Comparative Example 2 - Comparative Example 3 62.42 Comparative Example 4 56.78 Comparative Example 5 33.72 Comparative Example 6 60.27 Comparative Example 7 45.71

[0099] It can be seen from Table 1 that the polybutylene succinate described in the present invention has excellent hydrolysis resistance.

[0100] By comparing Example 1 with Comparative Examples 1 to 2, it can be seen that the hydrolysis resistance is further improved by controlling the molar ratio of succinic acid, butanediol and hydroxyethyl methacrylate to 1:(1.4-1.6):(0.1-0.4).

[0101] By comparing Example 1 with Comparative Examples 3-4 and 6, it can be seen that the present invention uses hydroxyethyl methacrylate, which has both carbon-carbon double bonds for addition reaction and hydroxyl groups for esterification reaction, thereby effectively improving the hydrolysis resistance.

[0102] Comparison of Example 1 and Comparative Example 5 shows that the use of hydroxyethyl methacrylate can further improve the hydrolysis resistance compared with other substances containing acrylic acid and hydroxyl groups.

[0103] By comparing Example 1 with Comparative Example 7, it can be seen that the present invention directly adds hydroxyethyl methacrylate in the first step to carry out esterification reaction, which effectively improves the hydrolysis resistance.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for preparing hydrolysis-resistant polybutylene succinate, characterized in that: The following steps are involved: (1) uniformly mixing succinic acid, butanediol and hydroxyethyl methacrylate, and subjecting them to an esterification reaction to obtain an esterification product; (2) adding an initiator to the esterification product to carry out an addition reaction to obtain an addition product; (3) adding a catalyst and a stabilizer to the addition product to carry out a polycondensation reaction, cooling, and pelletizing to obtain hydrolysis-resistant polybutylene succinate.

2. The method for preparing hydrolysis-resistant polybutylene succinate according to claim 1, characterized in that: The molar ratio of succinic acid, butanediol and hydroxyethyl methacrylate is 1:(1.4-1.6):(0.1-0.4).

3. The method for preparing the hydrolysis-resistant polybutylene succinate according to claim 1, characterized in that: The carboxyl content of the esterification product is 300-400 mol / t.

4. The method for preparing the hydrolysis-resistant polybutylene succinate according to claim 1, characterized in that: The temperature of the esterification reaction is 170-180°C.

5. The method for preparing hydrolysis-resistant polybutylene succinate according to claim 1, characterized in that: The mass ratio of the initiator to the esterification product is (200-300 ppm): 1, and the initiator includes at least one of cumene hydroperoxide, tert-butyl isononanoate peroxide, diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate and tert-butyl peroxybenzoate.

6. The method for preparing hydrolysis-resistant polybutylene succinate according to claim 1, characterized in that: The temperature of the addition reaction is 170-180° C., and the reaction time is 0.5-2 h.

7. The method for preparing hydrolysis-resistant polybutylene succinate according to claim 1, characterized in that: The mass ratio of the catalyst, the stabilizer and the addition product is (50-60ppm):(200-300ppm):

1.

8. The method for preparing hydrolysis-resistant polybutylene succinate according to claim 1, characterized in that: The catalyst comprises at least one of tetrabutyl titanate, tetramethyl titanate and tetraisopropyl titanate; The stabilizer includes at least one of tris(2,4-di-tert-butylphenyl)phosphite, tris(nonylphenyl)phosphite, and diisooctylphenyl phosphite.

9. The method for preparing hydrolysis-resistant polybutylene succinate according to claim 1, characterized in that: The temperature of the polycondensation reaction is 230-235° C., and the time is 4-5 hours.

10. A hydrolysis-resistant polybutylene succinate, characterized in that: The invention is prepared by the preparation method according to any one of claims 1 to 9.

Images