CN116284659A - High-strength lactic acid-based biodegradable elastomer material - Google Patents
High-strength lactic acid-based biodegradable elastomer material Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6648—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6651—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/4269—Lactones
- C08G18/4277—Caprolactone and/or substituted caprolactone
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/428—Lactides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
- C08G63/08—Lactones or lactides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2230/00—Compositions for preparing biodegradable polymers
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Abstract
The application discloses a high-strength lactic acid-based biodegradable elastomer material. In the technical scheme, lactic acid, caprolactone, branching agent and end group modifier are used as raw materials, an end group active branching prepolymer is prepared by adopting a melt polycondensation method, and isocyanate and the end group active branching prepolymer are reacted to prepare the high-strength lactic acid-based biodegradable elastomer material. The lactic acid-based elastomer can realize crosslinking curing at 50-100 ℃, and the cured elastomer has excellent tensile strength and biodegradability. By adjusting the types and the dosage of the branching agent, the end group modifier and the isocyanate, different topological structures are introduced, the molecular structure and the intermolecular acting force of the elastomer can be adjusted, the product performance is further changed, and the high strength and the biodegradability of the elastomer are realized.
Description
Technical Field
The application relates to the technical field of biodegradable materials, in particular to a high-strength lactic acid-based biodegradable elastomer material.
Background
Among the various polymers, elastomers are crosslinked and amorphous polymers, which are distinguished by their high elongation at break, high resistance to stress without permanent deformation. Because of its high elasticity, it is widely used in the electronics industry, the automotive industry and our everyday life, however, few biobased elastomers are used for engineering applications in addition to natural rubber. Therefore, the design and synthesis of bio-based elastomers as next generation elastomers is very important and highly desirable in both academia and industry. Carbohydrate derivatives are used as the most abundant biomass feedstock as monomers for the synthesis of bio-based polymers. Where lactic acid (2-hydroxypropionic acid, LA) is ubiquitous in nature, produced by bacterial fermentation of carbohydrates, LA has been identified by the U.S. department of energy as one of the "12-large" potential biomass-based compounds.
The bio-based elastomer is completely or partially derived from renewable resources, is a novel high polymer biological material and is mainly applied to soft tissue engineering and drug delivery. The synthesized degradable biological elastomer has three-dimensional cross-linked network structure similar to natural elastomer, high flexibility and elasticity. Chinese patent No. CN201410573539.6 discloses a polyester elastomer and a preparation method thereof, the elastomer has good rebound performance and biodegradability, however, the tensile strength of the elastomer can only reach 6.75MPa at maximum. Chinese patent No. CN201810179219.0 discloses a biodegradable thermoplastic elastomer material and a preparation method thereof, the biodegradable thermoplastic elastomer material has better elasticity and better degradation performance, but the tensile strength can only reach about 10 MPa. It has also been reported (Polym. Chem.6 (2015) 8112-8123) that biocompatible polylactic acid/butanediol/sebacic acid/perester copolyester elastomers have been synthesized by direct melt polycondensation, which exhibit excellent elongation at break (400-1600%), however, their tensile strength is only 4.9MPa at maximum.
The biodegradable elastomer prepared by the prior art often cannot achieve both high strength and high elasticity of the elastomer.
Disclosure of Invention
In view of the above, the present application provides a high-strength lactic acid-based biodegradable elastomer material capable of achieving both high strength and high elasticity of the elastomer.
It has been widely appreciated that the biodegradable elastomers produced in the related art often do not combine high strength with high elasticity of the elastomer.
Based on the problem, the inventor introduces a topological structure and a dynamic hydrogen bond into a lactic acid-based biodegradable elastomer at the same time, takes branching agent, end group modifier, caprolactone and lactic acid as raw materials, and adopts a one-step melt polycondensation method to prepare an end group active branched prepolymer, wherein the topological structure and the end group type of the branched prepolymer are adjustable, and the molecular weight is controllable; the isocyanate and the end-group reactive branched prepolymer are reacted to prepare the high-strength lactic acid-based biodegradable elastomer material. The molecular structure and the material property of the lactic acid-based elastomer can be adjusted by adjusting the types and the amounts of the raw materials.
Based on this, the present invention has been created.
The application provides a high-strength lactic acid-based biodegradable elastomer material, which is prepared by polymerizing the following components in parts by weight:
suitably, but not limitatively, the end-group reactive branched prepolymer is prepared from the following components in parts by weight by a melt polycondensation method:
suitably, but not limited to, the isocyanate is one or any of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene Diisocyanate (HDI), lysine Diisocyanate (LDI) and various oligomers thereof.
Suitably, but not limited to, the diluent is one or any of 1, 4-dioxane, tetrahydrofuran (THF), N-dimethylformamide, N-dimethylacetamide, toluene, xylene, diphenyl ether.
Suitably, but not limited to, the branching agent is one or any of citric acid, glycerol, pentaerythritol, boric acid, trimethylol propane, trimethylol ethane, 2-bis (hydroxymethyl) propionic acid, 2-bis (hydroxymethyl) butyric acid, 1,2,3, 4-butane tetracarboxylic acid, dipentaerythritol, xylitol, sorbitol.
Suitably, but not limited to, the end group modifier and the chain extender are one or any of ethylene glycol, 1, 2-propylene glycol, 1, 4-butanediol, 1, 6-hexanediol, neopentyl glycol, oxalic acid, adipic acid, ethylenediamine, propylenediamine, hexamethylenediamine, p-phenylenediamine and polyetheramine.
Suitably, but not limitatively, the catalyst a is SnCl 2 、Sn(Oct) 2 One or more of Sn powder, dibutyl tin dilaurate, zn powder and ZnO.
Suitably, but not limited to, the catalyst B is one or any of tetrabutyl titanate, 4-dimethylaminopyridine, p-toluenesulfonic acid, phosphomolybdic acid, concentrated sulfuric acid and concentrated phosphoric acid.
The preparation process of the high-strength lactic acid-based biodegradable elastomer material specifically comprises the following steps: 100 parts of the end-group reactive branched prepolymer was added to the reactor, heated to 120℃and mechanically stirred for 1 hour to remove the water in the system. Then cooling to 40-80 ℃, adding 30-90 parts of diluent into the reactor, gradually adding 1-30 parts of isocyanate monomer and 0.2-2 parts of catalyst A in 0.5h in nitrogen atmosphere, and mechanically stirring for 4h. Then 1-10 parts of chain extender is added into the reactor and mechanical stirring is continued for 12h. And finally pouring the reactant into a polytetrafluoroethylene mould, volatilizing the solvent for 24 hours at room temperature, and volatilizing the solvent for 24 hours in a vacuum oven at 80 ℃ to obtain the high-strength lactic acid-based biodegradable elastomer material.
Compared with the related art, the method has the following beneficial effects:
the high-strength lactic acid-based biodegradable elastomer material realizes the high strength and high elasticity of the lactic acid-based elastomer by introducing a branched structure and hydrogen bond acting force into the molecular structure of the elastomer, and is a novel method for preparing the biodegradable elastomer in a very environment-friendly and efficient way. Firstly, preparing an end-group active branched prepolymer by taking a branching agent, an end-group modifier, caprolactone and lactic acid as raw materials and adopting a one-step melt polycondensation method, wherein the topological structure and the end-group type of the branched prepolymer are adjustable, and the molecular weight is controllable; and reacting the isocyanate with the end-group reactive branched prepolymer to prepare the high-strength lactic acid-based biodegradable elastomer material. The molecular structure and the material property of the polyurethane elastomer can be adjusted by adjusting the types and the amounts of the branching agent, the end group modifier and the isocyanate.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below in connection with the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
Example 1:
(1) 100 parts of lactic acid monomer, 20 parts of caprolactone monomer and 10 parts of citric acid are polymerized for 4 hours under the condition that the pressure of a reaction system is controlled to be 70kPa at 120 ℃ by vacuumizing, and water generated in the reaction is removed to obtain branched prepolymer; then 10 parts of 1, 4-butanediol and 0.5 part of tetrabutyl titanate are added, the temperature is raised to 160 ℃, the reaction system pressure is controlled at 50kPa by vacuumizing, and the reaction is carried out for 2 hours, thus obtaining the hydroxyl-terminated branched prepolymer.
(2) Heating 100 parts of hydroxyl-terminated reactive branched prepolymer to 120 ℃, and mechanically stirring for 1h to remove water in the system; then cooling to 50 ℃, adding 30 parts of THF into a reactor, gradually adding 20 parts of isophorone diisocyanate and 0.5 part of dibutyltin dilaurate in 0.5h in nitrogen atmosphere, and mechanically stirring for 4h; 10 parts of p-phenylenediamine are then added to the reactor and mechanical stirring is continued for 12 hours. Pouring the reactant into a polytetrafluoroethylene mould, volatilizing the solvent at room temperature for 24 hours, and preserving the temperature at 80 ℃ for 24 hours under vacuum condition for molding and curing to obtain the high-strength lactic acid-based biodegradable elastomer material.
Example 2:
(addition of caprolactone)
(1) 100 parts of lactic acid monomer, 40 parts of caprolactone monomer and 10 parts of citric acid are polymerized for 4 hours under the condition that the pressure of a reaction system is controlled to be 70kPa at 120 ℃ by vacuumizing, and water generated in the reaction is removed to obtain branched prepolymer; then 10 parts of 1, 4-butanediol and 0.3 part of tetrabutyl titanate are added, the temperature is raised to 160 ℃, the reaction system pressure is controlled at 50kPa by vacuumizing, and the reaction is carried out for 4 hours, thus obtaining the hydroxyl-terminated branched prepolymer.
(2) Heating 100 parts of hydroxyl-terminated reactive branched prepolymer to 120 ℃, and mechanically stirring for 1h to remove water in the system; then, the temperature was lowered to 50℃and 50 parts of 1, 4-dioxane + THF (part ratio 1.4-dioxane: THF=2:1) was added to the reactor, and 20 parts of isophorone diisocyanate and 0.5 part of Sn (Oct) were gradually added over 0.5 hours under a nitrogen atmosphere 2 Mechanically stirring for 4 hours; 10 parts of p-phenylenediamine are then added to the reactor and mechanical stirring is continued for 12 hours. Pouring the reactant into a polytetrafluoroethylene mould, volatilizing the solvent at room temperature for 24 hours, and preserving the temperature at 80 ℃ for 24 hours under vacuum condition for molding and curing to obtain the high-strength lactic acid-based biodegradable elastomer material.
Example 3:
(modification of branching agent)
(1) 100 parts of lactic acid monomer, 20 parts of caprolactone monomer and 10 parts of pentaerythritol are polymerized for 4 hours under the condition that the pressure of a reaction system is controlled to be 70kPa at 120 ℃ by vacuumizing, and water generated in the reaction is removed to obtain branched prepolymer; then adding 10 parts of adipic acid and 0.5 part of p-toluenesulfonic acid and tetrabutyl titanate (part ratio of p-toluenesulfonic acid to tetrabutyl titanate=1:1) composite catalyst, heating to 160 ℃, vacuumizing, controlling the pressure of a reaction system at 50kPa, and reacting for 2 hours to obtain the hydroxyl-terminated branched prepolymer.
(2) Heating 100 parts of hydroxyl-terminated reactive branched prepolymer to 120 ℃, and mechanically stirring for 1h to remove water in the system; then cooling to 50 ℃, adding 30 parts of 1, 4-dioxane into a reactor, gradually adding 20 parts of isophorone diisocyanate and 0.8 part of dibutyltin dilaurate in 0.5h in nitrogen atmosphere, and mechanically stirring for 4h; 10 parts of p-phenylenediamine are then added to the reactor and mechanical stirring is continued for 12 hours. Pouring the reactant into a polytetrafluoroethylene mould, volatilizing the solvent at room temperature for 24 hours, and preserving the temperature at 80 ℃ for 24 hours under vacuum condition for molding and curing to obtain the high-strength lactic acid-based biodegradable elastomer material.
Example 4:
(changing isocyanate and second-step end group modifier)
100 parts of lactic acid monomer, 20 parts of caprolactone monomer and 10 parts of pentaerythritol are polymerized for 4 hours under the condition that the pressure of a reaction system is controlled to be 70kPa at 120 ℃ by vacuumizing, and water generated in the reaction is removed to obtain branched prepolymer; then adding 10 parts of adipic acid and 0.2 part of p-toluenesulfonic acid and tetrabutyl titanate (part ratio of p-toluenesulfonic acid to tetrabutyl titanate=1:1) composite catalyst, heating to 160 ℃, vacuumizing, controlling the pressure of a reaction system at 50kPa, and reacting for 2 hours to obtain the hydroxyl-terminated branched prepolymer.
(2) Heating 100 parts of hydroxyl-terminated reactive branched prepolymer to 120 ℃, and mechanically stirring for 1h to remove water in the system; then cooling to 50 ℃, adding 70 parts of 1, 4-dioxane into a reactor, gradually adding 20 parts of toluene diisocyanate and 0.5 part of dibutyltin dilaurate in 0.5h in nitrogen atmosphere, and mechanically stirring for 4h; 10 parts of ethylenediamine are then added to the reactor and mechanical stirring is continued for 12h. Pouring the reactant into a polytetrafluoroethylene mould, volatilizing the solvent at room temperature for 24 hours, and preserving the temperature at 80 ℃ for 24 hours under vacuum condition for molding and curing to obtain the high-strength lactic acid-based biodegradable elastomer material.
Example 5:
(changing isocyanate and second-step end group modifier)
(1) 100 parts of lactic acid monomer, 20 parts of caprolactone monomer and 10 parts of citric acid are polymerized for 4 hours under the condition that the pressure of a reaction system is controlled to be 70kPa at 120 ℃ by vacuumizing, and water generated in the reaction is removed to obtain branched prepolymer; then 10 parts of 1, 4-butanediol and 0.5 part of p-toluenesulfonic acid+tetrabutyl titanate (part ratio of p-toluenesulfonic acid: tetrabutyl titanate=1:1) composite catalyst are added, the temperature is raised to 160 ℃, the pressure of a reaction system is controlled at 50kPa by vacuumizing, and the reaction is carried out for 2 hours, so that the hydroxyl-terminated branched prepolymer is obtained.
(2) Heating 100 parts of hydroxyl-terminated reactive branched prepolymer to 120 ℃, and mechanically stirring for 1h to remove water in the system; then cooling to 50 ℃, adding 50 parts of THF into a reactor, gradually adding 20 parts of dicyclohexylmethane diisocyanate and 0.5 part of dibutyltin dilaurate in a nitrogen atmosphere within 0.5h, and mechanically stirring for 4h; 10 parts of ethylenediamine are then added to the reactor and mechanical stirring is continued for 12h. Pouring the reactant into a polytetrafluoroethylene mould, volatilizing the solvent at room temperature for 24 hours, and preserving the temperature at 80 ℃ for 24 hours under vacuum condition for molding and curing to obtain the high-strength lactic acid-based biodegradable elastomer material.
Example 6:
(adding branching agent)
(1) 100 parts of lactic acid monomer, 20 parts of caprolactone monomer and 20 parts of citric acid are polymerized for 4 hours under the condition that the pressure of a reaction system is controlled to be 70kPa at 120 ℃ by vacuumizing, and water generated in the reaction is removed to obtain branched prepolymer; then adding 20 parts of 1, 4-butanediol and 0.5 part of tetrabutyl titanate catalyst, heating to 160 ℃, vacuumizing, controlling the pressure of a reaction system at 50kPa, and reacting for 1h to obtain the hydroxyl-terminated branched prepolymer.
(2) Heating 100 parts of hydroxyl-terminated reactive branched prepolymer to 120 ℃, and mechanically stirring for 1h to remove water in the system; then cooling to 50 ℃, adding 30 parts of 1, 4-dioxane plus THF (part ratio of 1, 4-dioxane: THF=2:1) into a reactor, gradually adding 30 parts of dicyclohexylmethane diisocyanate and 0.5 part of dibutyltin dilaurate in 0.5h in nitrogen atmosphere, and mechanically stirring for 4h; then 20 parts of ethylenediamine are added to the reactor and mechanical stirring is continued for 12 hours. Pouring the reactant into a polytetrafluoroethylene mould, volatilizing the solvent at room temperature for 24 hours, and preserving the temperature at 80 ℃ for 24 hours under vacuum condition for molding and curing to obtain the high-strength lactic acid-based biodegradable elastomer material.
TABLE 1 mechanical Properties of the elastomer of the examples
| Numbering device | Tensile Strength/MPa | Elongation at break/% | toughness/MJ.m -3 |
| Example 1 | 23.32 | 401 | 37.98 |
| Example 2 | 18.27 | 323 | 25.23 |
| Example 3 | 38.76 | 276 | 63.26 |
| Example 4 | 35.18 | 356 | 48.64 |
| Example 5 | 28.73 | 443 | 40.15 |
| Example 6 | 37.52 | 204 | 55.61 |
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application.
Claims (8)
1. The high-strength lactic acid-based biodegradable elastomer material is characterized by being prepared by polymerizing the following components in parts by weight:
2. the high-strength lactic acid-based biodegradable elastomer material according to claim 1, wherein the end group reactive branched prepolymer is prepared from the following components in parts by weight by a melt polycondensation method:
3. the high strength lactic acid based biodegradable elastomer material according to claim 1, characterized in that the isocyanate is one or any of Toluene Diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene Diisocyanate (HDI), lysine Diisocyanate (LDI) and various oligomers thereof.
4. The high-strength lactic acid-based biodegradable elastomer material according to claim 1, characterized in that the diluent is one or any several of 1, 4-dioxane, tetrahydrofuran (THF), N-dimethylformamide, N-dimethylacetamide, toluene, xylene, diphenyl ether.
5. The high strength lactic acid based biodegradable elastomer material according to claim 1, characterized in that the branching agent is one or any of citric acid, glycerol, pentaerythritol, boric acid, trimethylolpropane, trimethylolethane, 2-bis (hydroxymethyl) propionic acid, 2-bis (hydroxymethyl) butyric acid, 1,2,3, 4-butanetetracarboxylic acid, dipentaerythritol, xylitol, sorbitol.
6. The high-strength lactic acid-based biodegradable elastomer material according to claim 2, wherein the end group modifier and the chain extender are one or any of ethylene glycol, 1, 2-propylene glycol, 1, 4-butanediol, 1, 6-hexanediol, neopentyl glycol, oxalic acid, adipic acid, ethylenediamine, propylenediamine, hexamethylenediamine, p-phenylenediamine and polyetheramine.
7. The high strength lactic acid based biodegradable elastomer material according to claim 1, characterized in that the catalyst a is SnCl 2 、Sn(Oct) 2 One or more of Sn powder, dibutyl tin dilaurate, zn powder and ZnO.
8. The high-strength lactic acid-based biodegradable elastomer material according to claim 2, wherein the catalyst B is one or any of tetrabutyl titanate, 4-dimethylaminopyridine, p-toluenesulfonic acid, phosphomolybdic acid, concentrated sulfuric acid, and concentrated phosphoric acid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310133904.0A CN116284659A (en) | 2023-02-20 | 2023-02-20 | High-strength lactic acid-based biodegradable elastomer material |
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| CN202310133904.0A CN116284659A (en) | 2023-02-20 | 2023-02-20 | High-strength lactic acid-based biodegradable elastomer material |
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