Degradable high molecular composition and method for preparing the same

Abstract

The present application belongs to the field of degradable polymer materials, and particularly relates to a degradable polymer composition and a preparation method thereof. The degradable polymer composition comprises the following raw material components in percentage by mass: saturated polyester 50-80%, unsaturated polyester 0-40%, hydrolysis regulator 1-10%, crystallization regulator 1-5%, crosslinking agent 1-5%, and initiator 0.05-1%. The saturated polyester is a blend of any one or both of aliphatic polyester and aliphatic / aromatic copolyester; the unsaturated polyester is aliphatic polyester; the hydrolysis regulator is used to adjust the degradation time of the composition; the crystallization regulator is used to adjust the toughness of the composition; the crosslinking agent forms a primary crosslinking structure between the polyesters, thereby improving the strength of the composition; and the initiator initiates a secondary crosslinking structure between the unsaturated polyesters, thereby assisting in improving the strength of the composition. The product formed by the degradable polymer composition has good mechanical properties, controllable degradation time, and high universality.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of degradable high molecular materials, and is mainly used to solve the pollution problem existing in the use of plastic in marine environment. More particularly, it relates to a degradable high molecular composition and a preparation method thereof. BACKGROUND

[0002] At present, marine garbage has become one of the main reasons for destroying the global marine ecological balance. Common marine garbage, such as discarded fishing nets, fishing lines, plastic bags, etc., usually has the characteristics of large surface area, easy winding and easy drifting, so it often adheres or holds the bodies of marine animals such as fish, turtles, dolphins, seals, etc., causing serious consequences such as animal body surface damage, limited activity and mechanical asphyxia. Secondly, the above-mentioned marine garbage is often taken as food by plankton, fish and invertebrates. Not only will it cause indigestion and even death of marine organisms, but also will enter the human body through the food chain and affect human health.

[0003] Plastic, rubber and fiber high molecular materials are common materials of marine garbage. However, plastic, rubber and fiber high molecular materials are increasingly used in the fields of marine engineering, fishery industry, marine transportation, etc. However, after becoming waste, the above-mentioned high molecular materials often need tens of years or even hundreds of years to decompose, the decomposition period is long and the decomposition products are toxic, which not only causes continuous threat and harm to marine organisms, but also leads to rapid deterioration of marine ecological environment. How to reduce the application of these materials and avoid continuous pollution pressure is one of the main problems faced by marine environmental protection work.

[0004] In view of the above problems, it is currently urgent to develop a high molecular material with controllable degradation period and harmless degradation products to replace the existing materials used in marine fields, so as to alleviate the pressure faced by the marine ecological environment, reduce the continuous pollution to the ocean, and realize the green and sustainable development of the marine related industry. SUMMARY

[0005] The present application provides a degradable high molecular composition and a preparation method thereof to solve the pollution problem of marine plastic. The high molecular composition has good mechanical properties, can be degraded in marine environment, and the degradation time is controllable, which has high universality.

[0006] The present application is implemented as follows:

[0007] In a first aspect, the present application provides a degradable high molecular composition, which comprises saturated polyester, unsaturated polyester, hydrolysis regulator, crystallization regulator, crosslinking agent and initiator, wherein, in terms of mass percentage,

[0008] The mass percentage of the saturated polyester is 50-80%;

[0009] the unsaturated polyester is 0-40% by mass;

[0010] the hydrolysis regulator is 1-10% by mass, for changing water absorption of the degradable high molecular composition, thereby adjusting degradation time length of the degradable high molecular composition;

[0011] the crystallization regulator is 1-5% by mass, for controlling grain size and crystallinity when the degradable high molecular composition is generated, thereby adjusting toughness of the degradable high molecular composition;

[0012] the crosslinking agent is 1-5% by mass, for forming a primary crosslinking structure between the saturated polyester and the unsaturated polyester, thereby adjusting strength of the degradable high molecular composition;

[0013] the initiator is 0.05-1% by mass, for initiating a secondary crosslinking structure between the unsaturated polyesters, thereby assisting in improving strength of the degradable high molecular composition.

[0014] In an optional embodiment, the saturated polyester is any one or a blend of the saturated aliphatic polyester and the saturated aliphatic-aromatic copolyester; when being a blend, the saturated aliphatic polyester accounts for 70-100% by mass in the blend.

[0015] In an optional embodiment, the saturated aliphatic polyester comprises one or more of the following: polybutylene adipate, polybutylene succinate, polybutylene glycol succinate, polyglycolic acid, polylactic acid, polycaprolactone, poly- pentadecalactone.

[0016] In an optional embodiment, the saturated aliphatic-aromatic copolyester material comprises one or more of the following: polybutylene adipate-co-terephthalate, polybutylene succinate-co-terephthalate, polybutylene glycol succinate-co-terephthalate.

[0017] In an optional embodiment, the unsaturated polyester comprises one or more of the following: polybutylene fumarate, polyhexylene fumarate, polybutylene maleate, polyhexylene maleate, polybutylene itaconate, polyhexylene itaconate.

[0018] In an optional embodiment, the hydrolysis regulator comprises one or more of the following: calcium oxide, magnesium oxide, calcium hydroxide, calcium chloride, xylitol, sorbitol, seaweed powder, polyethylene glycol 6000, and polyethylene glycol 1000.

[0019] In optional embodiments, the crystallization regulator comprises one or more of cellulose nanocrystals, carbon nanotubes, talc powder, vermiculite powder, calcium carbonate, silicon dioxide, titanium dioxide.

[0020] In optional embodiments, the crosslinking agent comprises one or more of glycerol, trimethylolpropane, pentaerythritol, dipentaerythritol.

[0021] In optional embodiments, the initiator comprises one or more of dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide, diisopropylbenzene hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

[0022] In optional embodiments, the number average molecular weight of the polyester is 10,000-100,000 g / mol; more preferably 40,000-100,000 g / mol.

[0023] In a second aspect, the present application provides a degradable polymer composition product made of the degradable polymer composition according to any one of the preceding embodiments.

[0024] In a third aspect, the present application provides a method for preparing a degradable polymer composition, comprising the following steps:

[0025] According to the required material properties and material degradation time, the component proportions of the saturated polyester, the unsaturated aliphatic polyester, the hydrolysis regulator, the crystallization regulator, the crosslinking agent, and the initiator are calculated, wherein the material properties include the strength and toughness of the material.

[0026] The degradable polymer composition is prepared according to the calculated component proportions, wherein the mass percentage of the saturated polyester is 50-80%, the mass percentage of the unsaturated polyester is 0-40%, the mass percentage of the hydrolysis regulator is 1-10%, the mass percentage of the crystallization regulator is 1-5%, the mass percentage of the crosslinking agent is 1-5%, and the percentage of the initiator is 0.05-1%.

[0027] In optional embodiments, the degradable polymer composition prepared according to the calculated component proportions comprises:

[0028] The use amounts of the components are provided according to the calculated component proportions;

[0029] The saturated polyester and the unsaturated polyester are first blended, extruded, and granulated by a double screw to obtain a master batch;

[0030] The master batch, the hydrolysis regulator, the crystallization regulator, the crosslinking agent, and the initiator are then blended, extruded, and granulated by a double screw to finally obtain the degradable polymer composition.

[0031] The present application has the following advantages: the embodiment of the present application provides a degradable high polymer composition including saturated polyester, unsaturated polyester, hydrolysis regulator, crystallization regulator, crosslinking agent and initiator. The mass percentage of the saturated polyester is 50-80%, which is the main matrix of the composition; the mass percentage of the unsaturated polyester is 0-40%, which is the second matrix of the composition; the mass percentage of the hydrolysis regulator is 1-10%, which is used to change the water absorption of the composition and adjust the degradation time; the mass percentage of the crystallization regulator is 1-5%, which is used to control the grain size and crystallinity of the degradable high polymer and has the function of regulating the toughness of the system; the mass percentage of the crosslinking agent is 1-5%, which is used to form the primary crosslinking structure between the polyesters and has the function of improving the strength of the composition; the mass percentage of the initiator is 0.05-1%, which is used to initiate the secondary crosslinking structure between the unsaturated polyesters and has the function of assisting to improve the strength of the composition. The product formed by the degradable high polymer composition described above has good mechanical properties, controllable degradation time (i.e. the degradation time can be changed according to the actual product), can be applied to marine environment, and can meet the application requirements in different sea areas by adjusting the components and proportions, and has high universality. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0033] Figure 1 The preparation method flow chart of the degradable high polymer composition provided by the embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will further illustrate the present application with examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0035] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by those skilled in the art to which the present application belongs.

[0036] The embodiment provides a degradable high polymer composition, which includes saturated polyester, unsaturated polyester, hydrolysis regulator, crystallization regulator, crosslinking agent and initiator.

[0037] The saturated polyester has a mass percentage of 50-80%, which is a first matrix of the degradable polymer composition; the unsaturated polyester has a mass percentage of 0-40%, which is a second matrix of the degradable polymer composition; the hydrolysis regulator has a mass percentage of 1-10%, which is used to change the water absorption of the degradable polymer composition, so as to adjust the degradation time of the degradable polymer composition; the crystallization regulator has a mass percentage of 1-5%, which is used to control the grain size and crystallinity of the degradable polymer composition when it is generated, so as to adjust the toughness of the degradable polymer composition; the crosslinking agent has a mass percentage of 1-5%, which is used to form a primary crosslinking structure between the saturated polyester and the unsaturated polyester, so as to adjust the strength of the degradable polymer composition; the initiator has a mass fraction of 0.05-1%, which is used to initiate a secondary crosslinking structure between the unsaturated polyesters, so as to assist in improving the strength of the degradable polymer composition.

[0038] The saturated polyester may be any one or a blend of saturated aliphatic polyester and saturated aliphatic-aromatic copolyester; when it is a blend, the mass percentage of the saturated aliphatic polyester in the blend is about 70-100%.

[0039] The saturated aliphatic polyester may include one or more of the following: polybutylene adipate, polybutylene succinate, polybutylene glycol succinate, polyglycolic acid, polylactic acid, polycaprolactone, polyheptadecalactone.

[0040] The saturated aliphatic-aromatic copolyester material may include one or more of the following: polybutylene adipate and polybutylene terephthalate random copolymer, polybutylene succinate and polybutylene terephthalate random copolymer, polyethylene glycol succinate and polybutylene terephthalate random copolymer.

[0041] The unsaturated polyester may include one or more of the following: polybutylene fumarate, polyhexylene fumarate, polybutylene maleate, polyhexylene maleate, polybutylene itaconate, polyhexylene itaconate.

[0042] The hydrolysis regulator may include one or more of the following: calcium oxide, magnesium oxide, calcium hydroxide, calcium chloride, xylitol, sorbitol, seaweed powder, polyethylene glycol 6000, and polyethylene glycol 1000.

[0043] The crystallization regulator may include one or more of the following: cellulose nanocrystals, carbon nanotubes, talc powder, vermiculite powder, calcium carbonate, silicon dioxide, titanium dioxide.

[0044] The crosslinking agent may include one or more of the following: glycerol, trimethylolpropane, pentaerythritol, dipentaerythritol.

[0045] The initiator may, for example, include one or more of dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide, diisopropylbenzene hydroperoxide, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

[0046] In some embodiments, a method for preparing a degradable high molecular composition is provided, comprising the following steps:

[0047] The raw materials are provided in the following component allocation ratio: 50-80% by mass of saturated polyester, 0-40% by mass of unsaturated polyester, 1-10% by mass of hydrolysis regulator, 1-5% by mass of crystallization regulator, 1-5% by mass of crosslinking agent, and 0.05-1% by mass of initiator;

[0048] The saturated polyester and the unsaturated polyester are first blended, extruded and granulated through a double screw at a determined ratio to obtain a master batch; and then the master batch, the hydrolysis regulator, the crystallization regulator, the crosslinking agent and the initiator are blended, extruded and granulated through a double screw at a determined ratio to finally obtain the degradable polyester composition.

[0049] In other embodiments, a method for preparing a degradable high molecular composition is also provided, comprising the following steps:

[0050] The component allocation ratio of the saturated polyester, the unsaturated aliphatic polyester, the hydrolysis regulator, the crystallization regulator, the crosslinking agent and the initiator is calculated according to the required material performance and material degradation time, wherein the material performance includes the strength and toughness of the material;

[0051] The degradable high molecular composition is prepared according to the calculated component allocation ratio, wherein the mass percentage of the saturated polyester is 50-80%, the mass percentage of the unsaturated polyester is 0-40%, the mass percentage of the hydrolysis regulator is 1-10%, the mass percentage of the crystallization regulator is 1-5%, the mass percentage of the crosslinking agent is 1-5%, and the percentage of the initiator is 0.05-1%.

[0052] The degradable high molecular composition prepared according to the calculated component allocation ratio comprises:

[0053] The use amount of each component is provided according to the calculated component allocation ratio;

[0054] The saturated polyester and the unsaturated polyester are first blended, extruded and granulated through a double screw to obtain a master batch;

[0055] The master batch, the hydrolysis regulator, the crystallization regulator, the crosslinking agent and the initiator are then blended, extruded and granulated through a double screw to obtain the degradable high molecular composition.

[0056] The strength, toughness and degradation time of the material required by the marine application product varies according to the different applications. The designer expects that the product can be degraded as soon as possible when it is discarded, and does not pollute and burden the marine environment on the premise of meeting the application. For this purpose, the application provides a degradable polymer composition and a preparation method thereof. By adjusting the component ratio of the composition, the strength, toughness and degradation time of the composition material can be controlled. For example, by adjusting the specific components and content of saturated polyester and unsaturated polyester, combined with the content adjustment of the crystallization regulator, crosslinking agent and initiator, the individualized demand of the material strength and toughness for different product practical applications can be met. In addition, by controlling the content of the hydrolysis regulator, the water absorption of the composition can be changed, so as to adjust the degradation time, and the individualized demand of the degradation time for different products can be adapted.

[0057] In addition, the specific substances and content of each component of the composition can also be selected according to the specific application environment of the product, such as the salinity of the application environment, the annual environmental typhoon grade, etc.

[0058] In specific implementation, the person skilled in the art can select a suitable saturated polyester material as the main matrix of the composition according to the material properties (strength and toughness) and the material degradation time required by the material, combined with industry experience and previous experimental results, and preliminarily set the ratio range of each component in the composition. Then 3-5 formulations are selected in the ratio range for small-scale experimental preparation, and the properties of the obtained composition are tested. Then the components and the ratio are optimized and adjusted according to the test results, until the material meets the needs of the pre-set application environment.

[0059] For example, in a certain water area (water temperature about 30℃, pH about 7.5), a degradable polymer material is used as a coral reef fixing net, and the performance requirements of the required material are: tensile strength ≥ 30 MPa, elongation at break ≥ 200%, and the expected service life is 12 months. First, according to the proposed target, polybutylene succinate (PBS) which can basically meet the above performance requirements is selected as the main matrix, and combined with previous experimental results and research experience, the proportions of saturated polyester (i.e. PBS), unsaturated polyester polyhexylene fumarate, hydrolysis regulator, crystallization regulator, crosslinking agent and initiator are preliminarily set as 70-80%, 2-20%, 1-5%, 1-3%, 2-3% and 1% respectively. Then, according to the above range, 5 representative formulations are selected for composition preparation and mechanical property determination, and the performance test of the degradation process is carried out in the same water environment. Then, according to the test results, the formulation closest to the expected target is adjusted slightly to make it more consistent with the performance requirements of the required material, and finally the target composition is obtained.

[0060] Example 1

[0061] A degradable polymer composition applied to seabed, comprising the following raw material components by mass percentage:

[0062] Saturated polyester: polybutylene succinate 80%;

[0063] Unsaturated polyester: polybutylene fumarate 10%;

[0064] Hydrolysis regulator: calcium oxide 5%;

[0065] Crystallization regulator: cellulose nanocrystal 2%;

[0066] Crosslinking agent: glycerol 2.5%;

[0067] Initiator: dicumyl peroxide 0.5%

[0068] An exemplary preparation method is as follows:

[0069] 80 parts of polybutylene succinate (number average molecular weight 35,000 g / mol) and 10 parts of polybutylene fumarate (number average molecular weight 20,000 g / mol) are added to a twin-screw extruder, blended and extruded to obtain a master batch.

[0070] 90 parts of the master batch, 5 parts of calcium oxide, 2 parts of cellulose nanocrystal, 2.5 parts of glycerol and 0.5 parts of dicumyl peroxide are added to a twin-screw extruder, blended and extruded to obtain a degradable polymer composition 1. The parts in this example and subsequent examples are mass parts.

[0071] The temperature of each section of the twin-screw extruder is as follows: 120-125℃ for the first section, 130-140℃ for the second section, 140-150℃ for the third section, 150-160℃ for the fourth section, 150-155℃ for the fifth section, and 140-145℃ for the head.

[0072] Example 2

[0073] Saturated polyester: polylactic acid 70%;

[0074] Unsaturated polyester: polybutylene itaconate 15%;

[0075] Hydrolysis regulator: calcium chloride 10%;

[0076] Crystallization regulator: silicon dioxide 2%;

[0077] Crosslinking agent: trimethylolpropane 2%;

[0078] Initiator: benzoyl peroxide 1%

[0079] An exemplary preparation method is as follows:

[0080] A master batch was obtained by blending and extruding 70 parts of polylactic acid (number average molecular weight of 30,000 g / mol) and 15 parts of polybutylene glycol itaconate (number average molecular weight of 40,000 g / mol) in a twin-screw extruder.

[0081] A degradable polymer composition 2 was obtained by blending and extruding 85 parts of the master batch, 10 parts of calcium chloride, 2 parts of silicon dioxide, 2 parts of trimethylolpropane, and 1 part of benzoyl peroxide in a twin-screw extruder.

[0082] The temperatures of the respective sections of the twin-screw extruder were 120-130°C for the first section, 130-135°C for the second section, 140-150°C for the third section, 150-160°C for the fourth section, 150-155°C for the fifth section, and 140-145°C for the head.

[0083] Example 3

[0084] A degradable polymer composition for use in the seabed, comprising the following raw material components in mass percentage:

[0085] Saturated polyester: polycaprolactone 65%;

[0086] Unsaturated polyester: polybutylene glycol maleate 25%;

[0087] Hydrolysis regulator: xylitol 5%;

[0088] Crystallization regulator: calcium carbonate 3%;

[0089] Crosslinking agent: glycerol 1%;

[0090] Initiator: dicumyl peroxide 1%

[0091] An exemplary preparation method is as follows:

[0092] A master batch was obtained by blending and extruding 65 parts of polycaprolactone (number average molecular weight of 50,000 g / mol) and 25 parts of polybutylene glycol maleate (number average molecular weight of 25,000 g / mol) in a twin-screw extruder.

[0093] A degradable polymer composition 3 was obtained by blending and extruding 90 parts of the master batch, 5 parts of xylitol, 3 parts of calcium carbonate, 1 part of glycerol, and 1 part of dicumyl peroxide in a twin-screw extruder.

[0094] The temperatures of the respective sections of the twin-screw extruder were 115-120°C for the first section, 130-140°C for the second section, 140-145°C for the third section, 150-155°C for the fourth section, 140-145°C for the fifth section, and 130-135°C for the head.

[0095] Example 4

[0096] A degradable polymer composition applied to the seabed, comprising the following raw material components by mass percentage:

[0097] Saturated polyester: poly-15-lactone 75%;

[0098] Unsaturated polyester: polyhexanediol fumarate 10%;

[0099] Hydrolysis regulator: polyethylene glycol 1000 10%;

[0100] Crystallization regulator: titanium dioxide 2%;

[0101] Crosslinking agent: pentaerythritol 2%;

[0102] Initiator: benzoyl peroxide 1%

[0103] An exemplary preparation method is as follows:

[0104] 75 parts of poly-15-lactone (number average molecular weight 35,000 g / mol) and 10 parts of polyhexanediol fumarate (number average molecular weight 20,000 g / mol) are added to a twin-screw extruder, blended and extruded to obtain a master batch.

[0105] 90 parts of the master batch, 10 parts of polyethylene glycol 1000, 2 parts of titanium dioxide, 2 parts of pentaerythritol and 1 part of benzoyl peroxide are added to a twin-screw extruder, blended and extruded to obtain a degradable polymer composition 4.

[0106] The temperature of each section of the twin-screw extruder is as follows: 120-125°C for the first section, 130-140°C for the second section, 140-150°C for the third section, 150-160°C for the fourth section, 150-155°C for the fifth section, and 130-135°C for the head.

[0107] Example 5

[0108] A degradable polymer composition applied to the seabed, comprising the following raw material components by mass percentage:

[0109] Saturated polyester: butylene succinate and butylene terephthalate random copolymer 70%;

[0110] Unsaturated polyester: polybutylene fumarate 15%;

[0111] Hydrolysis regulator: seaweed powder 8%;

[0112] Crystallization regulator: carbon nanotube 3%;

[0113] Crosslinking agent: trimethylolpropane 3%;

[0114] Initiator: dicumyl peroxide 1%

[0115] An exemplary preparation method is as follows:

[0116] 70 parts of butylene succinate and butylene terephthalate random copolymer (number average molecular weight of 35,000 g / mol) and 15 parts of polybutylene fumarate (number average molecular weight of 40,000 g / mol) were added into a twin-screw extruder, blended and extruded to obtain a master batch.

[0117] 85 parts of the master batch, 8 parts of seaweed powder, 3 parts of carbon nanotubes, 3 parts of trimethylolpropane and 1 part of dicumyl peroxide were added into a twin-screw extruder, blended and extruded to obtain a degradable polymer composition 5.

[0118] The temperature of each section of the twin-screw extruder was as follows: 120-125℃ for the first section, 135-140℃ for the second section, 140-155℃ for the third section, 155-160℃ for the fourth section, 150-155℃ for the fifth section, and 135-145℃ for the die head.

[0119] Example 6

[0120] A degradable polymer composition applied to the seabed, comprising the following raw material components by mass percentage:

[0121] Saturated polyester: polybutylene succinate 70%;

[0122] Butylene adipate and butylene terephthalate random copolymer 10%;

[0123] Unsaturated polyester: polybutylene fumarate 10%;

[0124] Hydrolysis regulator: calcium chloride 5%;

[0125] Crystallization regulator: carbon nanotube 2.5%;

[0126] Crosslinking agent: glycerol 2%;

[0127] Initiator: dicumyl peroxide 0.5%

[0128] An exemplary preparation method is as follows:

[0129] 70 parts of polybutylene succinate (number average molecular weight of 40,000 g / mol), 10 parts of butylene adipate and butylene terephthalate random copolymer (number average molecular weight of 25,000 g / mol) and 10 parts of polybutylene fumarate (number average molecular weight of 30,000 g / mol) were added into a twin-screw extruder, blended and extruded to obtain a master batch.

[0130] 90 parts of the master batch, 5 parts of calcium chloride, 2.5 parts of carbon nanotubes, 2 parts of glycerol and 0.5 parts of diisopropylbenzene peroxide were added into a twin-screw extruder, blended and extruded to obtain a degradable polymer composition 6.

[0131] The temperature of each section of the twin-screw extruder was as follows: 120-125℃ for the first section, 130-140℃ for the second section, 140-150℃ for the third section, 150-160℃ for the fourth section, 150-155℃ for the fifth section, and 140-145℃ for the head.

[0132] The degradable polymer compositions of the above examples 1 to 6 were respectively injection molded into standard tensile samples at 200℃ according to GB / T 1040.1-2018 and GB / T 1043.2—2018 to measure the mechanical properties. The specific data are as follows:

[0133]

[0134] The elongation at break (ε b ) and the residual mass (r w ) of the above degradable polymer compositions were measured after being placed in the coastal seawater of SanYa for a period of time (t), and the specific data are as follows:

[0135]

[0136]

[0137] Note: “--” means not measurable.

[0138] It should be obvious to those skilled in the art that the examples are only to help understand the present application and should not be regarded as specific limitations of the present application. If a specific technology or condition is not specified in the examples, it is performed according to the conventional technology or condition in the art or according to the product instruction, and if the manufacturer of the reagent or instrument is not specified, it is a conventional product that can be obtained from the market.

[0139] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A seawater-degradable polymer composition, characterized in that, The biodegradable polymer composition comprises saturated polyester, unsaturated polyester, hydrolysis regulator, crystallization regulator, crosslinking agent, and initiator, wherein, by mass percentage, The saturated polyester has a mass percentage of 70-80%; the saturated polyester is a random copolymer of polybutylene succinate, polylactic acid or butylene adipate and butylene terephthalate. The unsaturated polyester has a mass percentage of 10-15%; the unsaturated polyester is selected from polybutylene fumarate or polybutylene itaconic acid. The hydrolysis regulator is 5-10% by mass and is used to change the water absorption of the biodegradable polymer composition, thereby adjusting the degradation time of the biodegradable polymer composition; the hydrolysis regulator includes calcium oxide or calcium chloride. The crystallization regulator is present at a mass percentage of 2-5% and is used to control the grain size and crystallinity during the formation of the biodegradable polymer composition, thereby regulating the toughness of the biodegradable polymer composition; the crystallization regulator is selected from one or more of carbon nanotubes, silica and cellulose nanocrystals; The crosslinking agent has a mass percentage of 1-5% and is used to form a primary crosslinking structure between polyesters, including the saturated polyester and the unsaturated polyester, in order to regulate the strength of the biodegradable polymer composition. The initiator has a mass fraction of 0.05-1% and is used to initiate the secondary crosslinking structure between the unsaturated polyesters to help improve the strength of the biodegradable polymer composition.

2. The seawater-degradable polymer composition according to claim 1, characterized in that, The crosslinking agent includes one or more of glycerol, trimethylolpropane, pentaerythritol, and dipentaerythritol.

3. The seawater-degradable polymer composition according to claim 1, characterized in that, The initiator includes one or more of dicumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide, dicumyl hydroperoxide, and 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.

4. A seawater-degradable polymeric composition product, characterized in that, It is made using the seawater degradable polymer composition as described in any one of claims 1 to 3.

5. A method for preparing the seawater-degradable polymer composition according to claim 1, characterized in that, Includes the following steps: Based on the required material properties and degradation time, the component ratios of saturated polyester, unsaturated polyester, hydrolysis regulator, crystallization regulator, crosslinking agent, and initiator are calculated, and the material properties include the strength and toughness of the material. A biodegradable polymer composition is prepared according to the calculated component ratio, wherein the mass percentage of the saturated polyester is 70-80%, the mass percentage of the unsaturated polyester is 10-15%, the mass percentage of the hydrolysis regulator is 5-10%, the mass percentage of the crystallization regulator is 2-5%, the mass percentage of the crosslinking agent is 1-5%, and the mass percentage of the initiator is 0.05-1%.

6. The preparation method according to claim 5, characterized in that, The biodegradable polymer composition prepared according to the calculated component ratio includes: Provide the dosage of each component according to the calculated component ratio; First, the saturated polyester and the unsaturated polyester are blended, extruded, and granulated using a twin-screw extruder to obtain masterbatch; The masterbatch is then blended with the hydrolysis regulator, the crystallization regulator, the crosslinking agent and the initiator through a twin-screw extruder, extruded and granulated to finally obtain a biodegradable polymer composition.

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