A production process of biodegradable courier bag

Abstract

The present invention relates to a production process of a biodegradable courier bag, and belongs to the technical field of polymer materials. The present invention adopts dimethyl sulfoxide as a solvent, polyvinyl alcohol and itaconic acid as raw materials, performs an esterification reaction under the action of concentrated sulfuric acid as a catalyst to synthesize an alcohol ester compound, and then uses octadecylamine and thioglycolic acid to synthesize an intermediate, and the thiol group in the intermediate and the carbon-carbon double bond of the alcohol ester compound undergo an addition reaction to synthesize modified polyvinyl alcohol. The present invention also combines a compound synthesized by tribromophenol and 1-(chloro-methylphosphoryl)ethylene as raw materials with DOPO to form a modified flame retardant. Finally, the modified polyvinyl alcohol, the modified flame retardant, starch, a plasticizer, cellulose, a leveling agent and a defoamer are mixed to form a stock solution, and the stock solution is dried and cut to obtain a biodegradable courier bag. The biodegradable courier bag stock solution of the present invention has a low viscosity, is easy to process, has a better flame retardant effect after being prepared into a bag, and has good tensile resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a production process for a biodegradable express bag. Background Art

[0002] With the rapid development of the logistics industry and the continuous improvement of global environmental awareness, consumers' demand for environmentally friendly courier bags is increasing. Degradable courier bags, as a packaging material that can quickly decompose in the natural environment and effectively reduce environmental pollution, are gradually favored by the market.

[0003] At present, biodegradable courier bags are already very mature in technology, and their touch, load-bearing and tensile properties are not inferior to traditional plastic courier packaging bags, and can be used as a good substitute for traditional courier packaging bags. Polyvinyl alcohol (PVA) has excellent comprehensive performance and is a polymer material that can be completely biodegraded under certain conditions. However, in actual application, due to the presence of a large number of hydroxyl groups in its molecular structure, it is easy to form strong intermolecular and intramolecular hydrogen bonds, which seriously hinders its processability. Degradable courier bags face the problems of difficult processing, easy stretching and easy to be affected by moisture, which causes the performance of degradable courier bags to deteriorate, shortens the service life, and ultimately causes the increase in the cost of courier bags. At the same time, biodegradable courier bags are easy to burn. Therefore, the present invention modifies polyvinyl alcohol, esterifies the hydroxyl groups, effectively destroys the hydrogen bonds of PVA, and introduces hydrophobic long chains and amide bonds at the same time, reducing the loss caused by the easy moisture and low utilization rate of biodegradable courier bags. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a production process of a biodegradable express bag.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A biodegradable express bag material, comprising the following raw materials in parts by weight: 45-55 parts of modified polyvinyl alcohol, 5-15 parts of plasticizer, 5-10 parts of starch, 7-10 parts of cellulose, 260-500 parts of deionized water, 10-15 parts of modified flame retardant, 1-5 parts of leveling agent, and 1-3 parts of defoaming agent;

[0007] The plasticizer is glycerol.

[0008] The modified polyvinyl alcohol is prepared by the following method:

[0009] Step A1: Octadecanamine, 1-hydroxybenzotriazole and deionized water are mixed and stirred evenly, and then thioglycolic acid and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride solution are added, and the pH is adjusted to 5-6, and the mixture is stirred under magnetic stirring at room temperature for 4-5 hours, washed, filtered, dried at 50° C., and ground to obtain an intermediate;

[0010] Further, the amount ratio of octadecylamine, 1-hydroxybenzotriazole, deionized water, thioglycolic acid, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride solution is 0.4-0.5 g: 0.312-0.348 g: 40 mL: 1 mol: 2.5-5 mL, and the mass volume ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and deionized water is 1 g: 5 mL;

[0011] Step A2: polyvinyl alcohol and dimethyl sulfoxide are mixed evenly, stirred and dissolved in a water bath at 45-60°C for 1 hour to form a polyvinyl alcohol solution, and then itaconic acid and concentrated sulfuric acid are added, reacted under nitrogen protection for 1-4 hours, cooled to room temperature, washed, and dried at 60°C to obtain an alcohol ester compound;

[0012] Further, the dosage ratio of polyvinyl alcohol, dimethyl sulfoxide, itaconic acid and concentrated sulfuric acid is 10-20 g: 5-10 mL: 150-300 mL: 10-30 mL;

[0013] Step A3: Stir the alcohol ester compound in acetone, heat it in a water bath at 90°C for 2 hours, place it at room temperature for 6-48 hours, add the intermediate and the initiator, mix and stir for 30 minutes, irradiate with ultraviolet light for 15 minutes, rotary evaporate, and vacuum dry for 5 hours to obtain the modified polyvinyl alcohol;

[0014] Furthermore, the usage ratio of the alcohol ester compound, the intermediate, the initiator and the acetone is 2.32-2.61 g: 5.93-6.52 g: 0.1 g: 9 mL.

[0015] The modified flame retardant is prepared by the following method:

[0016] Step B1: Stir tribromophenol and chloroform under nitrogen protection, cool to -6°C, add 1-(chloro-methylphosphoryl)ethylene and triethylamine, heat to 60°C for 5h, wait until the temperature drops to room temperature, wash, rotary evaporate, and dry at 60°C to obtain the compound. The reaction route can be expressed as follows:

[0017]

[0018] Step B2: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), N,N-dimethylformamide (DMF) and the compound are mixed, stirred at 150°C for 9 hours, the obtained reaction solution is slowly dripped into deionized water, filtered, washed, and vacuum dried at 60°C for 24 hours to obtain a modified flame retardant. The reaction route can be expressed as follows:

[0019]

[0020] Furthermore, in step B1, the usage ratio of tribromophenol, chloroform, 1-(chloro-methylphosphinoyl)ethylene, and triethylamine is 0.03-0.07 mol:40-60 mL:0.04-0.06 mol:0.08-0.12 mol;

[0021] Furthermore, in step B2, the usage ratio of DOPO, N,N-dimethylformamide and compound 1 is 0.15-0.25 mol:40-60 mL:0.03-0.05 mol.

[0022] A production process of a biodegradable courier bag, specifically comprising the following steps:

[0023] Step S1: weighing raw materials by weight, mixing starch and deionized water evenly, heating to 55-65° C. to gelatinize starch granules into starch paste, and then adding modified polyvinyl alcohol, plasticizer, modified flame retardant and cellulose and stirring evenly to obtain a mixture;

[0024] Step S2: adding a leveling agent and a defoaming agent into the mixture and mixing and stirring evenly to obtain a courier bag stock solution;

[0025] Step S3: the courier bag stock solution is sent to the storage tank, and then the courier bag stock solution in the storage tank is evenly coated on the plane transmission device through the steel belt coating device, and dried into a polyvinyl alcohol film under the condition of 90°C hot air. The polyvinyl alcohol film is pressed and cut to obtain a biodegradable courier bag;

[0026] Furthermore, in step S3, the thickness of the polyvinyl alcohol film is 40-60 μm.

[0027] Beneficial effects of the present invention:

[0028] The biodegradable express bag of the present invention firstly utilizes the amino group of octadecylamine and the carboxyl group of thioglycolic acid to form an amide bond under the action of condensing agents 1-hydroxybenzotriazole and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to synthesize an intermediate containing a hydrophobic long chain and a thiol group; secondly utilizes the carboxyl group in itaconic acid and the hydroxyl group in polyvinyl alcohol to carry out an esterification reaction under the action of concentrated sulfuric acid as a catalyst to synthesize an alcohol ester compound containing a carbon-carbon double bond and an ester bond; finally utilizes the thiol group of the intermediate and the carbon-carbon double bond of the alcohol ester compound to undergo an addition reaction to synthesize modified polyvinyl alcohol. The amide bonds and hydrophobic long chains in modified polyvinyl alcohol can improve the water resistance of the material, and then improve the tensile strength of the material, effectively solving the loss caused by the moisture susceptibility and low utilization rate of biodegradable express bags; dimethyl sulfoxide as a solvent can effectively shield the strong hydrogen bonding effect within the PVA polymer chain, inhibit the regional aggregation of the polymer microstructure from the source, and release free hydroxyl groups. The free hydroxyl groups can effectively destroy the hydrogen bonding effect between PVA molecular chains through esterification reaction, reduce the viscosity of the express bag stock solution, and thus reduce the processing difficulty.

[0029] The modified flame retardant prepared by the present invention imparts excellent flame retardancy to the matrix. In the modified flame retardant, a compound with a phosphorus-oxygen double bond is first formed under the action of the acid-binding agent triethylamine, and then the carbon-carbon double bond of the compound and the DOPO flame retardant are combined to form the modified flame retardant; the DOPO in the modified flame retardant can promote the formation of a dense and continuous carbon layer during the combustion process, effectively isolate oxygen, prevent the exchange of heat and combustible gas, and inhibit further combustion of the material, while also synergistically flame retardant with the phosphorus-oxygen double bond, further improving the flame retardant efficiency; in addition, the Br element in the modified flame retardant can also be combined with the modified polyvinyl alcohol hydroxyl group, so that the flame retardant is better dispersed in the matrix and the flame retardant effect is improved.

[0030] The biodegradable courier bag prepared by the present invention not only has excellent flame retardant properties, processability, and tensile strength, but also promotes the sustainable development of the entire courier industry. The biodegradable courier bag uses environmentally friendly and degradable materials polyvinyl alcohol and starch as the base material. No harmful substances remain during the degradation process, which is friendly to the ecological environment and greatly reduces the pressure on the environment. Among them, starch allows the courier bag to automatically decompose and volatilize in an outdoor environment. This decomposition process helps to improve the fertility of the soil, thereby promoting plant growth and protecting the environment. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0032] Example 1

[0033] A production process of a biodegradable courier bag, specifically comprising the following steps:

[0034] Step S1: weighing raw materials by weight, 45 parts of modified polyvinyl alcohol (prepared in this embodiment), 5 parts of plasticizer, 5 parts of starch, 7 parts of cellulose, 260 parts of deionized water, 10 parts of modified flame retardant (prepared in this embodiment), 1 part of polyacrylamide, and 1 part of water-based silicone defoamer, mixing starch and deionized water evenly, heating to 55-65° C. to gelatinize starch granules into starch paste, then adding modified polyvinyl alcohol, plasticizer, modified flame retardant and cellulose and stirring evenly to obtain a mixture;

[0035] Step S2: adding polyacrylamide and water-based silicone defoamer to the mixture and mixing and stirring evenly to obtain a courier bag stock solution;

[0036] Step S3: the courier bag stock solution is sent into a storage tank, and then the courier bag stock solution in the storage tank is evenly coated on a flat transmission device through a steel belt coating device, and dried into a polyvinyl alcohol film under a hot air condition of 90°C. The polyvinyl alcohol film is pressed to a thickness of 40 μm, and cut to obtain a biodegradable courier bag;

[0037] The modified polyvinyl alcohol is prepared by the following method:

[0038] Step A1: 0.4 g of octadecylamine, 0.312 g of 1-hydroxybenzotriazole and 40 mL of deionized water were mixed and stirred evenly, and then 1 mol of thioglycolic acid and 2.5 mL of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride solution were added, and the pH was adjusted to 5-6. The mixture was stirred under magnetic stirring at room temperature for 4-5 h, washed, filtered, dried at 50° C., and ground to obtain an intermediate;

[0039] Step A2: 10 g of polyvinyl alcohol and 5 mL of dimethyl sulfoxide were mixed evenly, and the mixture was dissolved in a water bath at 45-60° C. with stirring for 1 h to form a polyvinyl alcohol solution, and then 150 mL of itaconic acid and 10 mL of concentrated sulfuric acid were added, and the mixture was reacted under nitrogen protection for 1-4 h. After cooling to room temperature, the mixture was washed and dried at 60° C. to obtain an alcohol ester compound;

[0040] Step A3: 2.32 g of the alcohol ester compound was stirred evenly in 9 mL of acetone, and heated in a water bath at 90°C for 2 h. After being placed at room temperature for 6-48 hours, 5.93 g of the intermediate and 0.1 g of the initiator were added, mixed and stirred for 30 min, and then irradiated with a UV lamp for 15 min, rotary evaporated, and vacuum dried for 5 h to obtain the modified polyvinyl alcohol;

[0041] The modified flame retardant is prepared by the following method:

[0042] Step B1: Stir 0.03 mol tribromophenol and 40 mL chloroform under nitrogen protection, cool to -6°C, add 0.04 mol 1-(chloro-methylphosphoryl)ethylene and 0.08 mol triethylamine, heat to 60°C and react for 5 hours, wait until the temperature drops to room temperature, wash, rotary evaporate, and dry at 60°C to obtain the compound;

[0043] Step B2: 0.15 mol 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 40 mL N,N-dimethylformamide (DMF) and 0.03 mol compound were mixed, stirred at 150 ° C for 9 h, the obtained reaction solution was slowly dripped into deionized water, filtered, washed, and vacuum dried at 60 ° C for 24 h to obtain a modified flame retardant.

[0044] Example 2

[0045] A production process of a biodegradable courier bag, specifically comprising the following steps:

[0046] Step S1: weighing raw materials by weight, 50 parts of modified polyvinyl alcohol (prepared in this embodiment), 10 parts of plasticizer, 7 parts of starch, 8 parts of cellulose, 380 parts of deionized water, 12 parts of modified flame retardant (prepared in this embodiment), 3 parts of polyacrylamide, and 2 parts of water-based silicone defoamer, mixing starch and deionized water evenly, heating to 55-65° C. to gelatinize starch granules into starch paste, and then adding modified polyvinyl alcohol, plasticizer, modified flame retardant and cellulose and stirring evenly to obtain a mixture;

[0047] Step S2: adding polyacrylamide and water-based silicone defoamer to the mixture and mixing and stirring evenly to obtain a courier bag stock solution;

[0048] Step S3: the courier bag stock solution is sent into a storage tank, and then the courier bag stock solution in the storage tank is evenly coated on a flat transmission device through a steel belt coating device, and dried into a polyvinyl alcohol film under a hot air condition of 90°C. The polyvinyl alcohol film is pressed to a thickness of 50 μm, and cut to obtain a biodegradable courier bag;

[0049] The modified polyvinyl alcohol is prepared by the following method:

[0050] Step A1: 0.45 g of octadecylamine, 0.330 g of 1-hydroxybenzotriazole and 40 mL of deionized water were mixed and stirred evenly, and then 1 mol of thioglycolic acid and 3.8 mL of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride solution were added, and the pH was adjusted to 5-6. The mixture was stirred under magnetic stirring at room temperature for 4-5 h, washed, filtered, dried at 50° C., and ground to obtain an intermediate;

[0051] Step A2: 15 g of polyvinyl alcohol and 8 mL of dimethyl sulfoxide were mixed evenly, and the mixture was dissolved in a water bath at 45-60° C. with stirring for 1 h to form a polyvinyl alcohol solution. 225 mL of itaconic acid and 20 mL of concentrated sulfuric acid were then added, and the mixture was reacted under nitrogen protection for 1-4 h. After cooling to room temperature, the mixture was washed and dried at 60° C. to obtain an alcohol ester compound.

[0052] Step A3: 2.46 g of the alcohol ester compound was stirred evenly in 9 mL of acetone, and heated in a water bath at 90°C for 2 h. After being placed at room temperature for 6-48 hours, 6.23 g of the intermediate and 0.1 g of the initiator were added, mixed and stirred for 30 min, and then irradiated with a UV lamp for 15 min, rotary evaporated, and vacuum dried for 5 h to obtain the modified polyvinyl alcohol;

[0053] The modified flame retardant is prepared by the following method:

[0054] Step B1: Stir 0.05 mol tribromophenol and 50 mL chloroform under nitrogen protection, cool to -6°C, add 0.05 mol 1-(chloro-methylphosphoryl)ethylene and 0.10 mol triethylamine, heat to 60°C and react for 5 hours, wait until the temperature drops to room temperature, wash, rotary evaporate, and dry at 60°C to obtain the compound;

[0055] Step B2: 0.20 mol 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 50 mL N,N-dimethylformamide (DMF) and 0.04 mol compound were mixed, stirred at 150 ° C for 9 h, the obtained reaction solution was slowly dripped into deionized water, filtered, washed, and vacuum dried at 60 ° C for 24 h to obtain a modified flame retardant.

[0056] Example 3

[0057] A production process of a biodegradable courier bag, specifically comprising the following steps:

[0058] Step S1: weighing raw materials by weight, 50 parts of modified polyvinyl alcohol (prepared in this embodiment), 15 parts of plasticizer, 10 parts of starch, 10 parts of cellulose, 500 parts of deionized water, 15 parts of modified flame retardant (prepared in this embodiment), 5 parts of polyacrylamide, and 3 parts of water-based silicone defoamer, mixing starch and deionized water evenly, heating to 55-65° C. to gelatinize starch granules into starch paste, then adding modified polyvinyl alcohol, plasticizer, modified flame retardant and cellulose and stirring evenly to obtain a mixture;

[0059] Step S2: adding polyacrylamide and water-based silicone defoamer to the mixture and mixing and stirring evenly to obtain a courier bag stock solution;

[0060] Step S3: the courier bag stock solution is sent into a storage tank, and then the courier bag stock solution in the storage tank is evenly coated on a flat transmission device through a steel belt coating device, and dried into a polyvinyl alcohol film under a hot air condition of 90°C. The polyvinyl alcohol film is pressed to a thickness of 40 μm, and cut to obtain a biodegradable courier bag;

[0061] The modified polyvinyl alcohol is prepared by the following method:

[0062] Step A1: 0.5 g of octadecylamine, 0.348 g of 1-hydroxybenzotriazole and 40 mL of deionized water were mixed and stirred evenly, and then 1 mol of thioglycolic acid and 5 mL of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride solution were added, and the pH was adjusted to 5-6. The mixture was stirred under magnetic stirring at room temperature for 4-5 h, washed, filtered, dried at 50° C., and ground to obtain an intermediate;

[0063] Step A2: 20 g of polyvinyl alcohol and 10 mL of dimethyl sulfoxide were mixed evenly, and the mixture was dissolved by stirring in a water bath at 45-60° C. for 1 h to form a polyvinyl alcohol solution, and then 300 mL of itaconic acid and 30 mL of concentrated sulfuric acid were added, and the mixture was reacted under nitrogen protection for 1-4 h. After cooling to room temperature, the mixture was washed and dried at 60° C. to obtain an alcohol ester compound;

[0064] Step A3: 2.61 g of the alcohol ester compound was stirred evenly in 9 mL of acetone, and heated in a water bath at 90°C for 2 h. After being placed at room temperature for 6-48 hours, 6.52 g of the intermediate and 0.1 g of the initiator were added, mixed and stirred for 30 min, and then irradiated with a UV lamp for 15 min, rotary evaporated, and vacuum dried for 5 h to obtain the modified polyvinyl alcohol;

[0065] The modified flame retardant is prepared by the following method:

[0066] Step B1: Stir 0.07 mol tribromophenol and 60 mL chloroform under nitrogen protection, cool to -6°C, add 0.06 mol 1-(chloro-methylphosphoryl)ethylene and 0.12 mol triethylamine, heat to 60°C and react for 5 hours, wait until the temperature drops to room temperature, wash, rotary evaporate, and dry at 60°C to obtain the compound;

[0067] Step B2: 0.25 mol 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 60 mL N,N-dimethylformamide (DMF) and 0.05 mol compound were mixed, stirred at 150 ° C for 9 h, the obtained reaction solution was slowly dripped into deionized water, filtered, washed, and vacuum dried at 60 ° C for 24 h to obtain a modified flame retardant.

[0068] Comparative Example 1

[0069] This comparative example is a biodegradable express bag, which differs from Example 3 in that an equal amount of polyvinyl alcohol is used to replace the modified polyvinyl alcohol prepared in Example 3, and the rest are the same.

[0070] Comparative Example 2

[0071] This comparative example is a biodegradable express bag, which differs from Example 3 in that an equal amount of ammonium polyphosphate is used to replace the modified flame retardant prepared in Example 3, and the rest are the same.

[0072] Performance test: The viscosity of the courier bag stock solution prepared in Examples 1-3 and Comparative Examples 1-2 was tested using an Anton Paar rheometer at a measurement temperature of 30°C; the courier bags prepared in Examples 1-3 and Comparative Examples 1-2 were cut into standard test sizes, immersed in water for 24 hours, and the tensile strength of the courier bags was tested; the courier bags prepared in Examples 1-3 and Comparative Examples 1-2 were cut into standard test sizes, and the vertical burning performance was tested using the GB / T2048-1996 plastic burning performance test method; the test results are shown in the following table:

[0073]

[0074] It can be seen from the above table that the biodegradable express bag stock solution prepared by the present invention has a low viscosity. The lower the viscosity, the easier it is to process. After being prepared into bags, the flame retardant effect is better and the bag has good tensile resistance.

[0075] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A production process for biodegradable courier bags, characterized in that: The following steps are involved: Step S1: weighing 45-55 parts of modified polyvinyl alcohol, 5-15 parts of plasticizer, 5-10 parts of starch, 7-10 parts of cellulose, 260-500 parts of deionized water, 10-15 parts of modified flame retardant, 1-5 parts of leveling agent, and 1-3 parts of defoaming agent by weight, uniformly mixing the starch and deionized water, heating to 55-65° C. to gelatinize the starch granules into starch paste, and then adding the modified polyvinyl alcohol, plasticizer, modified flame retardant and cellulose and stirring evenly to obtain a mixture; Step S2: adding a leveling agent and a defoaming agent into the mixture and mixing and stirring evenly to obtain a courier bag stock solution; Step S3: the courier bag stock solution is sent to the storage tank, and then the courier bag stock solution in the storage tank is evenly coated on the plane transmission device through the steel belt coating device, and dried into a polyvinyl alcohol film under the condition of 90°C hot air. The polyvinyl alcohol film is pressed and cut to obtain a biodegradable courier bag; The modified polyvinyl alcohol is prepared by the following method: Step A1: Octadecanamine, 1-hydroxybenzotriazole and deionized water are mixed and stirred evenly, and then thioglycolic acid and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride solution are added, and the pH is adjusted to 5-6, and the mixture is stirred under magnetic stirring at room temperature for 4-5 hours, washed, filtered, dried at 50° C., and ground to obtain an intermediate; Step A2: polyvinyl alcohol and dimethyl sulfoxide are mixed evenly, stirred and dissolved in a water bath at 45-60°C for 1 hour to form a polyvinyl alcohol solution, and then itaconic acid and concentrated sulfuric acid are added, reacted under nitrogen protection for 1-4 hours, cooled to room temperature, washed, and dried at 60°C to obtain an alcohol ester compound; Step A3: Stir the alcohol ester compound in acetone, heat it in a water bath at 90°C for 2 hours, place it at room temperature for 6-48 hours, add the intermediate and the initiator, mix and stir for 30 minutes, irradiate with ultraviolet light for 15 minutes, rotary evaporate, and vacuum dry for 5 hours to obtain the modified polyvinyl alcohol; The modified flame retardant is prepared by the following method: Step B1: Stir tribromophenol and chloroform under nitrogen protection, cool to -6°C, add 1-(chloro-methylphosphoryl)ethylene and triethylamine, heat to 60°C and react for 5h, wait until the temperature drops to room temperature, wash, rotary evaporate, and dry at 60°C to obtain the compound; Step B2: 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, N,N-dimethylformamide and the compound are mixed, stirred at 150° C. for 9 hours, the obtained reaction solution is slowly dripped into deionized water, filtered, washed, and vacuum dried at 60° C. for 24 hours to obtain a modified flame retardant.

2. The production process of a biodegradable courier bag according to claim 1, characterized in that: In step A1, the amount ratio of octadecylamine, 1-hydroxybenzotriazole, deionized water, thioglycolic acid, and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride solution is 0.4-0.5 g: 0.312-0.348 g: 40 mL: 1 mol: 2.5-5 mL, and the mass volume ratio of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and deionized water is 1 g: 5 mL.

3. The production process of a biodegradable courier bag according to claim 1, characterized in that: In step A2, the dosage ratio of polyvinyl alcohol, dimethyl sulfoxide, itaconic acid and concentrated sulfuric acid is 10-20 g: 5-10 mL: 150-300 mL: 10-30 mL.

4. The production process of a biodegradable courier bag according to claim 1, characterized in that: In step A3, the usage ratio of the alcohol ester compound, the intermediate, the initiator and the acetone is 2.32-2.61 g: 5.93-6.52 g: 0.1 g: 9 mL.

5. The production process of a biodegradable courier bag according to claim 1, characterized in that: In step B1, the usage ratio of tribromophenol, chloroform, 1-(chloro-methylphosphoryl)ethylene and triethylamine is 0.03-0.07 mol: 40-60 mL: 0.04-0.06 mol: 0.08-0.12 mol.

6. The production process of a biodegradable courier bag according to claim 1, characterized in that: In step B2, the usage ratio of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, N,N-dimethylformamide and compound 1 is 0.15-0.25 mol:40-60 mL:0.03-0.05 mol.

7. The production process of a biodegradable courier bag according to claim 1, characterized in that: The initiator is triethylamine and the plasticizer is glycerol.

Images