A bio-based polymer, a bio-based composition, and a preparation method and application thereof

Abstract

The invention discloses a bio-based polymer, a bio-based composition, a preparation method and an application thereof, and belongs to the technical field of bio-based polymers. The bio-based polymer of the invention comprises a diacid monomer and a diol monomer as reaction monomers, wherein the diacid monomer is at least one of a fatty diacid and an aromatic diacid obtained by fermentation of a fatty acid fraction from a vegetable oil, and the diol monomer is selected from at least one of a diol with a carbon chain length of 2 to 8; the molar ratio of the diacid monomer to the diol monomer is in the range of 1:(1.1 to 1.3), wherein the fatty diacid obtained by fermentation of the fatty acid fraction of the vegetable oil accounts for 50-80% of the molar fraction of the diacid monomer substance, and the aromatic diacid accounts for 20-50% of the molar fraction of the diacid monomer substance. The invention prepares bio-based polyester by replacing petroleum-based diacid with a fatty acid fraction from a vegetable oil, and increases the mechanical strength of the bio-based polymer by introducing an aromatic diacid structure into a bio-based segment, thereby meeting the use requirements of rubber-surface gloves.

Description

Technical Field

[0001] The present invention relates to the field of bio-based polymers, in particular to a bio-based polymer, a bio-based composition, and a preparation method and application thereof. Background Art

[0002] As a widely used synthetic material, polymers play an important role in almost every manufacturing field. Compared with other materials, polymers have the advantages of adjustable properties, easy processing, high strength, resistance to chemical and physical degradation, and low cost. Traditional polymer production relies on petrochemical resources to provide most of the monomers, and plastic manufacturing accounts for about 7% of global oil and natural gas consumption. Petrochemical resources are non-renewable, and the market is sensitive to various economic and political factors. The price of petrochemical energy is prone to drastic fluctuations. The environmental problems caused by the non-degradability of most synthetic polymers have brought major challenges to sustainable development. These factors have driven people to develop new polymer materials using renewable raw materials. Currently, renewable raw materials widely used in industrial production include animal and plant oils and fats, polysaccharides (starch and sugar), wood (lignocellulose) and proteins. Among these materials, vegetable oils have a wide range of applications in biodiesel, lubricants and polymer synthesis. Especially in the field of polymer synthesis, vegetable oils can be used to prepare important monomers for polymer synthesis such as polyols and dibasic acids, and then synthesize new polymers with thermomechanical properties comparable to or better than petrochemical products. Vegetable oil is an ester formed by glycerol and different fatty acids containing 8 to 24 carbon atoms and 0 to 7 carbon-carbon double bonds. It is generally difficult to use it directly in polymerization reactions, or the degree of polymerization is low, resulting in the mechanical strength of bio-based polymers being inferior to that of petroleum-based polymers. When used in rubber gloves, they will have insufficient wear resistance and tear resistance. Summary of the invention

[0003] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a bio-based polymer and a preparation method thereof, a bio-based composition and a preparation method thereof, and the use of the bio-based composition in the preparation of bio-based rubber surfaces and degradable bio-based gloves, which have the advantages of good wear resistance and tear resistance.

[0004] The object of the present invention is to provide a bio-based polymer.

[0005] The technical scheme for achieving the purpose of the present invention is as follows: a bio-based polymer, wherein the bio-based polymer is a bio-based polyester, and the reaction monomers of the bio-based polyester include a diacid monomer and a diol monomer, the diacid monomer is at least one of a fatty diacid and an aromatic diacid obtained by fermenting a fatty acid fraction from a vegetable oil, and the diol monomer is selected from at least one of a diol with a carbon chain length of 2 to 8; the molar ratio of the diacid monomer to the diol monomer is in the range of 1:(1.1 to 1.3), wherein the fatty diacid obtained by fermenting a fatty acid fraction from a vegetable oil accounts for 50-80% of the molar fraction of the diacid monomer, and the aromatic diacid accounts for 20-50% of the molar fraction of the diacid monomer.

[0006] The weight average molecular weight of bio-based polyester is 5000-30000 g / mol, the molecular weight distribution coefficient (Mw / Mn) is 1.5-3, and the glass transition temperature is -30℃--55℃. The glass transition temperature is lower than room temperature, and bio-based polyester exhibits a high elastic state, which can be used in the core of rubber gloves, thereby improving the protective performance of the gloves.

[0007] Preferably, the fatty diacid obtained by fermenting the fatty acid fraction from the vegetable oil accounts for 60-70% of the diacid monomer substance, and the aromatic diacid accounts for 30-40% of the diacid monomer substance. Introducing the rigid structure of the aromatic diacid into the bio-based chain segment can enhance the wear resistance and strength of the bio-based polymer, making it more suitable for the use requirements of rubber gloves.

[0008] The diol monomer is selected from at least one diol with a carbon chain length of 2 to 8, and can be specifically selected from at least one of ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, and 1,8-octanediol; preferably, the diol monomer is selected from at least one diol with a carbon chain length of 3 to 6, and is specifically selected from at least one of 1,4-butanediol and 1,6-hexanediol. 1,4-butanediol and 1,6-hexanediol are used to synthesize bio-based polyester, which can improve excellent mechanical properties and heat resistance, and ensure the softness and strength of rubber gloves.

[0009] The fatty acid fraction derived from the vegetable oil is at least one of triglyceride derived from olive oil, lauric acid derived from coconut oil, linoleic acid derived from sunflower oil, palmitic acid derived from palm oil, triglyceride derived from rapeseed oil, palmitic acid and stearic acid derived from linseed oil, and linoleic acid and oleic acid derived from soybean oil.

[0010] Preferably, the fatty acid fraction derived from vegetable oil is at least one of lauric acid derived from coconut oil, linoleic acid derived from sunflower oil, palmitic acid derived from palm oil, palmitic acid and stearic acid derived from linseed oil, and linoleic acid and oleic acid derived from soybean oil.

[0011] More preferably, the fatty acid fraction derived from the vegetable oil is at least one of palmitic acid derived from palm oil and linoleic acid and oleic acid derived from soybean oil.

[0012] The vegetable oil is selected from one or more of virgin vegetable oil, refined vegetable oil and recycled vegetable oil; preferably, for the purpose of low carbon and environmental protection, the vegetable oil is selected from recycled vegetable oil.

[0013] The aromatic diacid is one or both of terephthalic acid and isophthalic acid; preferably, the aromatic diacid is a mixture of terephthalic acid and isophthalic acid, and more preferably, the mass ratio of terephthalic acid to isophthalic acid is 1:1.

[0014] The fatty diacid obtained by fermenting the fatty acid fraction derived from the vegetable oil is prepared by the following method: 1) inoculating 1 to 10 parts by weight of tropical Candida strain ATCC No. 20962 into a culture medium composed of 20 to 30 parts of peptone and 20 to 30 parts of glucose, and shaking and culturing for 15 to 30 hours; 2) transferring the cultured strain to a fermentation tank, adding 200 to 500 parts of culture medium raw materials and 100 to 200 parts by weight of at least one fatty acid fraction derived from the vegetable oil, and continuing to stir for 48 to 72 hours, and controlling the reaction conditions to maintain a state suitable for fermentation by using an intelligent control system, wherein the pH of the fermentation liquid is 7.5 to 8, the dissolved oxygen is 56 to 60 V / V%, and the glucose concentration is 50 to 60 wt%; 3) after the reaction is completed, slowly adding a hydrochloric acid solution to the fermentation liquid to adjust the pH to 1.0 to 1.5, and then extracting twice with 200 to 500 parts by weight of diethyl ether, and removing the diethyl ether by rotary evaporation to obtain the fatty diacid.

[0015] The culture medium raw materials include 100-250 parts of glucose, 15-40 parts of peptone, 30-80 parts of yeast nitrogen base, 15-40 parts of acetic acid, 40-100 parts of dipotassium hydrogen phosphate and 60-120 parts of potassium dihydrogen phosphate by weight.

[0016] Another object of the present invention is to provide a method for preparing a bio-based polymer, comprising the following steps: 1) adding a reaction monomer and a catalyst into a reactor, carrying out an esterification reaction under the protection of an inert gas, heating the temperature to 190°C to 250°C at a rate of 1°C / min to 20°C / min, maintaining the reaction time for 0.5 to 10 hours, and continuously removing water produced by the reaction by diversion and calculating the esterification rate based on the mass of the removed water. When the total esterification rate reaches more than 95%, the esterification reaction is terminated; 2) adding a stabilizer, heating the reactor to 200 to 270°C, and gradually evacuating the system to a pressure of 10 to 200 Pa for a condensation reaction. During this process, the by-product alcohol will be continuously distilled out. The reaction time is 1-5 hours, and then slowly introducing an inert gas until normal pressure is restored to obtain a bio-based polymer.

[0017] The stabilizer is two or more of trimethyl phosphate, triphenyl phosphate, phosphorous acid and its ester compounds or phosphoric acid and its ester compounds; preferably phosphorous acid and triphenyl phosphate, with a mass ratio of 2:1; the amount of the stabilizer is 0.01-0.2% of the total resin weight.

[0018] The catalyst is at least one of ethylene glycol titanium, tetramethyl titanate, tetraethyl titanate, tetrapropyl titanate, tetraisopropyl titanate or tetrabutyl titanate, and the amount of the catalyst is 0.5‰ to 0.3% of the total resin weight.

[0019] Another object of the present invention is to provide a bio-based composition, comprising the following components by weight: 100 parts of bio-based polymer latex, 50 parts of nitrile latex, 1-3 parts of potassium hydroxide, 1-3 parts of sulfur, 1-3 parts of 4,4'-dithiodiphenylamine, 4-8 parts of zinc oxide, 1-3 parts of BZ accelerator, 1-3 parts of EZ accelerator, 0.1-1 part of color powder, 1-3 parts of antioxidant, and 170-300 parts of water. The bio-based polymer latex is prepared from the above-mentioned bio-based polymer, and the preparation method is to mix 20-40 parts of bio-based polymer, 6-12 parts of emulsifier and 60-80 parts of water, stir and ultrasonically treat for 30min to 60min.

[0020] The emulsifier is selected from at least one of sodium dodecyl sulfate and sodium dodecylbenzene sulfonate.

[0021] The color powder is selected from at least one of titanium dioxide, carbon black, phthalocyanine blue, iron oxide red and titanium yellow.

[0022] The antioxidant is at least one of phenolic, amine, phosphite and hindered phenolic antioxidants.

[0023] Preferably, the mass ratio of sulfur to 4,4'-dithiodiphenylamine is 1:1.

[0024] Another object of the present invention is to provide a method for preparing a bio-based composition, which is obtained by mixing bio-based polymer latex, nitrile latex, potassium hydroxide, sulfur, 4,4'-dithiodiphenylamine, zinc oxide, BZ accelerator, EZ accelerator, color powder, antioxidant and water.

[0025] The present invention also protects a degradable bio-based glove, comprising a glove lining and an outer dip layer, wherein the glove lining is a cotton seamless woven glove lining, and the outer dip layer is obtained by coagulating the above-mentioned bio-based composition, and the coagulant is calcium nitrate or calcium chloride.

[0026] The present invention also protects a method for preparing a degradable bio-based glove, comprising the following steps: putting a glove lining onto a hand mold, immersing the hand mold in a coagulant, taking out the hand mold, drying it, then immersing it in the above-mentioned bio-based composition, taking out the hand mold, drying it, drying and vulcanizing it at 100-120°C, and demolding it.

[0027] Beneficial Effects

[0028] The present invention provides a bio-based polymer and a bio-based combination and a preparation method and application thereof, which have the following advantages: (1) The diacid monomer of the bio-based polymer is a fatty diacid obtained by fermenting the fatty acid fraction of vegetable oil, which reduces the use of petroleum-based diacids and reduces carbon emissions. The introduction of aromatic diacid structures into the bio-based segments can increase the wear resistance and strength of the bio-based polymer. The obtained bio-based polymer exhibits a high elastic state at room temperature, so that the softness and strength of the bio-based polymer meet the use requirements of rubber gloves. (2) The bio-based composition improves the strength and elasticity of polyester and rubber by ultrasonically emulsifying the bio-based polymer into latex and nitrile latex, and adds the vulcanization cross-linking effect of sulfur and 4,4'-dithiodiphenylamine, thereby enhancing the wear resistance and tear resistance of the glove product. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the examples, the experimental methods used are conventional methods unless otherwise specified, and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0031] The raw materials used in the embodiments and comparative examples are described as follows:

[0032] Candida tropicalis strain ATCC No. 20962: Shanghai Collection Center, Ruichu Biotechnology;

[0033] Fatty diacid 1: prepared by the following method: 1) inoculating 10 parts by weight of tropical Candida strain ATCC No. 20962 into a culture medium consisting of 20 parts of peptone and 20 parts of glucose, and shaking and culturing at 250 rpm and 30° C. for 20 hours; 2) transferring 10% (volume fraction) of the cultured bacteria to a fermenter, adding 497 parts of culture medium raw materials, specifically including 200 parts of glucose, 30 parts of peptone, 67 parts of yeast nitrogen base, 30 parts of acetic acid, 72 parts of dipotassium hydrogen phosphate, and 93 parts of potassium dihydrogen phosphate, and continuing to culture for 12 hours, then adding 200 parts of palmitic acid fraction derived from palm oil, adding 2 mol / L NaOH solution to adjust the pH to 7.5, and slowly stirring for 48 to 72 hours for bioreactor. The invention relates to a method for preparing a bioconversion liquid having a pH value of 7.5-8 and a dissolved oxygen value of 56-60 V / V%, and a glucose concentration of 50-60 wt%. The method comprises the following steps: first, the fermentation liquid is subjected to a step of conversion and glucose is continuously supplemented with glucose so that the bioconversion reaction can proceed continuously. The reaction conditions can be controlled by an intelligent control system to maintain a state suitable for fermentation, wherein the pH value of the fermentation liquid is 7.5-8, the dissolved oxygen value is 56-60 V / V%, and the glucose concentration is 50-60 wt%. Samples are taken out from the fermentation tank every 12 hours for measurement to determine the glucose concentration, fatty acid consumption and diacid conversion rate. 3) When the conversion rate reaches 95%, the reaction is terminated, and a hydrochloric acid solution is slowly added to the fermentation liquid to adjust the pH value to 1.0, and then 500 parts of diethyl ether are used for extraction twice. After the diethyl ether is removed by rotary evaporation, palmitic acid is obtained. The palmitic acid can also be further purified by a chromatography column to finally obtain a fatty diacid with a purity greater than 99%.

[0034] Fatty diacid 2: The preparation method is the same as that of fatty diacid 1, except that the fatty acid fraction used is a mixture of linoleic acid and oleic acid derived from soybean oil;

[0035] Fatty diacid 3: The preparation method is the same as that of fatty diacid 1, except that the fatty acid fraction used is triglyceride derived from olive oil;

[0036] Fatty diacid 4: The preparation method is the same as that of fatty diacid 1, except that the fatty acid fraction used is a mixture of palmitic acid and stearic acid derived from recycled linseed oil;

[0037] Nitrile latex: Model: 300, Sankeshu, Thailand, surface tension 35Dyn / cm;

[0038] Unless otherwise specified, the components and raw materials used in the embodiments and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0039] Polymer 1~13

[0040] A bio-based polymer is prepared by the following method: 1) adding 50-80 parts of fatty diacid, 110 parts of fatty diol, 0-50 parts of isophthalic acid, 0-50 parts of terephthalic acid and 0.5 parts of tetrabutyl titanate as catalysts into a reaction kettle, carrying out esterification reaction under the protection of nitrogen, heating to 210°C at a rate of 2°C / min, maintaining the reaction temperature at 210°C for continuous reaction, and continuously removing water produced by the reaction by splitting and calculating the esterification rate according to the mass of the removed water, and when the total esterification rate reaches more than 95%, the esterification reaction is terminated; 2) adding 0.2 parts of phosphorous acid and 0.1 parts of triphenyl phosphate, heating the reaction kettle to 230°C, and gradually evacuating the system to a pressure of 10Pa within 100 minutes for polycondensation reaction, during which byproduct alcohol will be continuously distilled out, the reaction time is 5 hours, and then slowly introducing nitrogen until normal pressure is restored to obtain the bio-based polymer. The monomer composition of the bio-based polymer is shown in Table 1, and the prepared bio-based polymer is subjected to the following tests:

[0041] 1. Determination of weight average molecular weight and molecular weight distribution coefficient (Mw / Mn): Gel permeation chromatography (GPC) was used for testing, with tetrahydrofuran as the eluent at a flow rate of 1 mL / min.

[0042] 2. Glass transition temperature: measured by DSC204F1 differential scanning calorimeter from NETZSCH, Germany. The test conditions are: under nitrogen as protective gas, the temperature is increased to 150°C at a heating rate of 10K / min, then isothermal for 5 minutes, then cooled to -100°C at a cooling rate of 10K / min, isothermal for 5 minutes, and finally heated to 150°C at a heating rate of 10K / min to obtain the DSC curve of the bio-based polymer.

[0043] Table 1 Monomer composition and molecular weight (molar ratio) of bio-based polymers

[0044]

[0045] Example 1

[0046] A bio-based composition is prepared by the following method: (1) 30 parts of polymer 2, 6 parts of emulsifier sodium dodecylbenzene sulfonate and 60 parts of water are mixed, stirred and ultrasonically treated for 60 minutes, and the obtained bio-based polymer latex is mixed with nitrile latex, potassium hydroxide, sulfur, zinc oxide, BZ accelerator, EZ accelerator, color powder, antioxidant and water and stirred evenly; wherein, the bio-based polymer latex is 100 parts, the nitrile latex is 50 parts, the potassium hydroxide is 2 parts, the sulfur is 2 parts, and the 2 parts of 4'-dithiodiphenylamine, 6 parts of zinc oxide, 2 parts of BZ accelerator, 2 parts of EZ accelerator, 0.5 parts of titanium dioxide, 22462 parts of antioxidant, and 200 parts of water; (2) putting the glove lining on the hand mold, immersing the hand mold in an aqueous solution with a mass fraction of 20% calcium nitrate, then taking out the hand mold, drying it, and then immersing it in the bio-based composition obtained in step (1), then taking out the hand mold, drying it, drying and vulcanizing it at 100-120°C, and demolding it to form a bio-based glove.

[0047] Embodiments 2 to 12

[0048] Compared with Example 1, the difference is that the polymers are polymers 1, 3 to 12;

[0049] Embodiment 13

[0050] Compared with Example 1, the difference is that sulfur is 1 part and 4,4'-dithiodiphenylamine is 3 parts;

[0051] Embodiment 14

[0052] Compared with Example 1, the difference is that sulfur is 3 parts and 4,4'-dithiodiphenylamine is 1 part;

[0053] Comparative Example 1

[0054] Compared with Example 1, the difference is that the polymer is polymer 13;

[0055] Comparative Example 2

[0056] Compared with Example 1, the difference is that sulfur is 4 parts and 4,4'-dithiodiphenylamine is 0 parts;

[0057] Comparative Example 3

[0058] Compared with Example 1, the difference is that sulfur is 0 parts and 4,4'-dithiodiphenylamine is 4 parts;

[0059] The prepared bio-based gloves were subjected to the following performance tests, and the results are shown in Table 2:

[0060] (1) Wear resistance: tested according to EN 388:2016+A1:2018 standard;

[0061] (2) Cutting resistance: tested according to EN 388:2016+A1:2018 standards;

[0062] (3) Tear resistance: tested according to EN 388:2016+A1:2018 standard;

[0063] (4) Puncture resistance: tested according to EN 388:2016+A1:2018 standards;

[0064] (5) Biodegradation rate: According to the test method of ISO14855, the bio-based combination is made into a film with a thickness of 0.2 cm, and the CO2 release after 90 days of composting is used as the degradation index;

[0065] Table 2 Properties of gloves made from bio-based compositions

[0066]

[0067]

[0068] As can be seen from Table 2, the gloves prepared in the present invention meet the requirements of abrasion resistance LEVEL 4, cut resistance LEVEL 1, tear resistance LEVEL 3, and puncture resistance LEVEL 1 specified in the EN388 standard, and the biodegradation rate after 90 days is above 23%.

[0069] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A bio-based polymer, characterized in that The bio-based polymer is a bio-based polyester, wherein the reaction monomers of the bio-based polyester include a diacid monomer and a diol monomer, wherein the diacid monomer is at least one of a fatty diacid and an aromatic diacid obtained by fermenting a fatty acid fraction of a vegetable oil, and the diol monomer is at least one of a diol having a carbon chain length of 2 to 8; the molar ratio of the diacid monomer to the diol monomer is in the range of 1:(1.1 to 1.3), wherein the fatty diacid obtained by fermenting a fatty acid fraction of the vegetable oil accounts for 50-80% of the molar fraction of the diacid monomer, and the aromatic diacid accounts for 20-50% of the molar fraction of the diacid monomer; The fatty acid fraction derived from vegetable oil is at least one of triglyceride derived from olive oil, lauric acid derived from coconut oil, linoleic acid derived from sunflower oil, palmitic acid derived from palm oil, triglyceride derived from rapeseed oil, palmitic acid and stearic acid derived from linseed oil, and linoleic acid and oleic acid derived from soybean oil; The fatty diacid obtained by fermenting the fatty acid fraction derived from vegetable oil is prepared by the following method: S1. 1 to 10 parts by weight of tropical Candida strain ATCC No. 20962 is inoculated into a culture medium composed of 20 to 30 parts of peptone and 20 to 30 parts of glucose, and the culture is shaken and cultured for 15 to 30 hours; S2. The cultured strain is transferred to a fermentation tank, 200-500 parts of culture medium raw materials and 100-200 parts by weight of at least one fatty acid fraction derived from vegetable oil are added, and stirring is continued for 48 to 72 hours, and the reaction conditions are controlled by an intelligent control system to maintain a state suitable for fermentation, wherein the pH of the fermentation liquid is 7.5-8, the dissolved oxygen is 56 to 60 V / V%, and the glucose concentration is 50 to 60 wt%; S3. After the reaction is completed, a hydrochloric acid solution is slowly added to the fermentation liquid to adjust the pH to 1.0 to 1.5, and then 200 to 500 parts by weight of diethyl ether are used for extraction twice, and the diethyl ether is removed by rotary evaporation to obtain the fatty diacid.

2. The bio-based polymer according to claim 1, characterized in that The fatty diacid obtained by fermenting the fatty acid fraction of the vegetable oil accounts for 60-70% of the molar fraction of the diacid monomers, and the aromatic diacid accounts for 30-40% of the molar fraction of the diacid monomers.

3. The bio-based polymer according to claim 1, characterized in that The vegetable oil is selected from one or more of native vegetable oil, refined vegetable oil and recycled vegetable oil; the aromatic diacid is one or both of terephthalic acid and isophthalic acid.

4. The bio-based polymer according to claim 1, characterized in that The culture medium raw materials include 100-250 parts of glucose, 15-40 parts of peptone, 30-80 parts of yeast nitrogen base, 15-40 parts of acetic acid, 40-100 parts of dipotassium hydrogen phosphate and 60-120 parts of potassium dihydrogen phosphate by weight.

5. The method for preparing a bio-based polymer according to any one of claims 1 to 4, comprising the following steps: 1) Adding reaction monomers and catalysts into a reactor, carrying out esterification reaction under the protection of inert gas, heating to 190°C to 250°C at a rate of 1°C / min to 20°C / min, maintaining the reaction time for 0.5 to 10 hours, and continuously removing water produced by the reaction by diversion and calculating the esterification rate based on the mass of the removed water. When the total esterification rate reaches more than 95%, the esterification reaction is completed; 2) Adding a stabilizer, heating the reactor temperature to 200 to 270°C, and gradually evacuating the system to a pressure of 10 to 200 Pa for polycondensation reaction. During this process, the by-product alcohol will be continuously distilled out. The reaction time is 1 to 5 hours, and then slowly introducing an inert gas until normal pressure is restored to obtain a bio-based polymer.

6. A bio-based composition, characterized in that The invention comprises the following components by weight: 100 parts of bio-based polymer latex, 50 parts of nitrile latex, 1-3 parts of potassium hydroxide, 1-3 parts of sulfur, 1-3 parts of 4,4'-dithiodiphenylamine, 4-8 parts of zinc oxide, 1-3 parts of BZ accelerator, 1-3 parts of EZ accelerator, 0.1-1 parts of color powder, 1-3 parts of antioxidant and 170-300 parts of water. The bio-based polymer latex is prepared from the bio-based polymer according to any one of claims 1 to 5, and the preparation method comprises the following steps of mixing 20-40 parts of bio-based polymer, 6-12 parts of emulsifier and 60-80 parts of water, stirring and ultrasonically treating for 30-60 minutes.

7. The method for preparing a bio-based polymer according to claim 6, characterized in that: The method is obtained by mixing bio-based polymer latex, nitrile latex, potassium hydroxide, sulfur, 4,4'-dithiodiphenylamine, zinc oxide, BZ accelerator, EZ accelerator, color powder, antioxidant and water.

8. A biodegradable bio-based glove, characterized in that: The glove comprises a glove lining and an outer rubber layer, wherein the outer rubber layer is obtained by solidifying the bio-based composition according to claim 6.

9. The method for preparing a biodegradable bio-based glove according to claim 8, comprising the following steps: Put the glove lining on the hand mold, immerse the hand mold in the coagulant, take out the hand mold, dry it, then immerse it in the above bio-based composition, take out the hand mold, dry it, dry and vulcanize it at 100-120℃, and demold it.

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