CN113429757B - Biodegradable anti-fogging master batch for mulching film and preservative film - Google Patents
Biodegradable anti-fogging master batch for mulching film and preservative film Download PDFInfo
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Abstract
The invention discloses an antifogging master batch for biodegradable mulching films and preservative films, which is prepared from the following raw materials, by weight, 50-70% of a resin master batch, 10-20% of a dripping agent, 10-20% of an antifogging agent, 1-5% of a light stabilizer, 0.5-3% of a coupling agent, 1-3% of a dispersing agent and 0.1-1% of an antioxidant. The anti-fogging master batch for the PBAT mulching film and the preservative film, which is prepared by the invention, has good anti-fogging, anti-aging, heat resistance, chemical resistance and the like, can be directly added into the production of the PBAT film for use, has simple process and convenient operation, can improve the product quality and the like, and has good practical value and application prospect.
Description
Technical Field
The invention relates to the technical field of master batch preparation, in particular to an anti-fogging master batch with biodegradability for mulching films and preservative films.
Background
The materials with biodegradability have wide application in the field of material preparation, can be degraded by microorganisms in the nature to finally form carbon substances, have lower influence on the environment compared with other materials, and are widely concerned by people under the current trend of environmental protection.
The PBAT resin is one of biodegradable materials, has excellent biodegradability and is widely applied to environment-friendly materials, but the PBAT resin has defects when used as a single material, has relatively low mechanical strength and cannot meet the daily needs of people, so that the invention of the anti-fogging master batch for the biodegradable mulching film and the preservative film is particularly important.
Disclosure of Invention
The invention aims to provide an anti-fogging master batch for a biodegradable mulching film and a preservative film, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the antifog drop master batch for the mulching film and the preservative film with biodegradability is prepared from the following raw materials, by weight, 50-70% of resin master batch, 10-20% of a dripping agent, 10-20% of an antifog agent, 1-5% of a light stabilizer, 0.5-3% of a coupling agent, 1-3% of a dispersing agent and 0.1-1% of an antioxidant.
Furthermore, the dripping agent is one of polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate and coconut diethanolamide.
Further, the antifogging agent is one of perfluoroalkanol unsaturated acid ester polymer, an addition product of perfluoroalkanol and ethylene oxide and perfluoroalkanol amide;
the light stabilizer is a hindered amine light stabilizer;
the coupling agent is a silane coupling agent;
the dispersant is EBS;
the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite ester antioxidant 168.
Further, the preparation steps of the anti-fogging master batch are as follows,
s1, mixing resin master batch, dripping agent, antifogging agent, light stabilizer, coupling agent, dispersant and antioxidant in a high-speed mixer at 1500-2000r/min for 15-30 min;
and S2, adding the mixed materials into a double-screw extruder for full melt blending, controlling the melting temperature at 160-180 ℃ and the screw rotating speed at 100-600 r/min, shearing and mixing for 10-15 min, and then extruding, cooling, granulating, drying and packaging to obtain the anti-fogging master batch.
Further, the resin master batch is PBAT resin or PBAT resin copolymer, and the PBAT resin copolymer is prepared from PBAT resin, polylactic acid, tetrabutyl titanate and an auxiliary agent; the auxiliary agent comprises 2-chloro-3-trichloromethyl pyridine, 2,4-difluoroaniline, toluene and glacial acetic acid.
Further, the resin master batch is prepared by the following method,
s1, dissolving 2-chloro-3-trichloromethylpyridine in toluene, adding titanium tetrachloride and glacial acetic acid, refluxing and heating at the temperature of 110-115 ℃ for 3-3.5h, distilling after the reaction is finished, and recovering a distillate to obtain a product A;
s2, cooling 2,4-difluoroaniline at the temperature of 2-4 ℃, adding potassium carbonate, stirring, adding the product A, stirring and heating at the temperature of 25-27 ℃, maintaining for 2-4min, heating at the temperature of 50-60 ℃, reacting for 2-2.5h, heating, and extracting to obtain a product B;
s3, dissolving potassium hydroxide and trifluorophenol in toluene, adding the product B, and stirring for 5-6 hours to obtain a product C;
and S4, heating the PBAT resin and the polylactic acid at the temperature of 60-65 ℃, removing water at the temperature of 180-185 ℃, adding the product C and the product D, and uniformly stirring to obtain a resin master batch.
Further, the preparation steps of the product D are as follows,
cooling the recovered fraction at 10-13 deg.C, introducing ammonia gas, slowly heating at 20-23 deg.C, adding alkali solution to regulate pH, controlling pH at 9-10, adding butanol, stirring, reacting for 1-1.5 hr, distilling at 195 deg.C to obtain product D.
Further, the mass ratio of the PBAT resin to the polylactic acid is 2.3 to 2.6.
Compared with the prior art, the invention has the following beneficial effects: the anti-fogging master batch for the PBAT mulching film and the preservative film, which is prepared by the invention, has good anti-fogging, anti-aging, heat resistance, chemical resistance and the like, can be directly added into the production of the PBAT film for use, has simple working procedures and convenient operation, can improve the product quality and the like, and has good practical value and application prospect.
The main component of the master batch prepared by the method is PBTA which is a copolymer of butanediol adipate and butanediol terephthalate, and the master batch has excellent biodegradability, good heat resistance and impact resistance, and is widely applied to the field of degradable materials.
The polylactic acid is also called polylactide, is a commonly used degradable biological material in green materials, has excellent biodegradability, can be utilized by microorganisms to generate carbon dioxide and water, and is green and environment-friendly.
The product prepared by the method has certain biodegradability, and the degradation method comprises the steps of burying the product in soil, and degrading the product by using microorganisms in the soil, wherein the microorganisms contain a large amount of enzymes, and the degradation is performed by using the activity of the enzymes. The method comprises the steps of reacting 2-chloro-3-trichloromethylpyridine with glacial acetic acid in an environment containing titanium tetrachloride to obtain a product A, reacting the product A with 2,4-difluoroaniline to obtain a product, and reacting potassium hydroxide, trifluorophenol and the product B to obtain the amide herbicide, wherein the amide herbicide can play a certain weeding role in the degradation process of soil. The amide herbicide is a carotene inhibitor, and can further achieve the purpose of weeding.
Carbon tetrachloride is used as a main catalyst when the amide herbicide is prepared, has certain toxicity, and can escape into the air after being evaporated, so that production personnel are poisoned and the environment is harmed. Therefore, the application carries out recovery treatment on the waste water.
The method comprises the steps of cooling recovered gas, introducing ammonia gas, then adding alkali liquor to ensure that the pH value is within the range of 9-10, then adding butanol and continuously introducing ammonia gas to obtain a product D, mixing the obtained product D with a product C, PBAT resin and polylactic acid, and further obtaining a resin master batch.
The main component in the product D is tetrabutyl titanate, PBAT resin is used as a main material in the application to realize excellent biodegradability, but due to the low strength, another polymer needs to be introduced for doping, so that the mechanical strength of the product is improved.
However, the compatibility of the PBAT resin and the polylactic acid is poor, and the product obtained in the preparation process can not meet the design requirement, so that the product D is added, the tetrabutyl titanate contained in the product D can enhance the compatibility of the PBAT resin and the polylactic acid, and the obtained blend material of the PBAT resin and the polylactic acid has better performance.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The antifog drop master batch for the biodegradable mulching film and the preservative film is prepared from the following raw materials, by weight, 50% of resin master batch, 20% of a dripping agent, 20% of an antifog agent, 5% of a light stabilizer, 2% of a coupling agent, 2% of a dispersing agent and 1% of an antioxidant.
The dripping agent is polyoxyethylene sorbitan monolaurate.
The antifogging agent is a perfluoroalkanol unsaturated acid ester polymer;
the light stabilizer is a hindered amine light stabilizer;
the coupling agent is a silane coupling agent;
the dispersant is EBS;
the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite ester antioxidant 168.
The resin master batch is PBAT resin.
The preparation method of the anti-fogging master batch comprises the following specific steps,
s1, mixing resin master batch, dripping agent, antifogging agent, light stabilizer, coupling agent, dispersing agent and antioxidant in a high-speed mixer at 1500r/min for 15min;
and S2, adding the mixed materials into a double-screw extruder for full melt blending, controlling the melting temperature at 160 ℃ and the screw rotating speed at 100r/min, shearing and mixing for 10min, and then extruding, cooling, granulating, drying and packaging to obtain the anti-fogging master batch.
Example 2
The antifog drop master batch for the biodegradable mulching film and the preservative film is prepared from 60 wt% of resin master batch, 15 wt% of a dripping agent, 15 wt% of an antifog agent, 4 wt% of a light stabilizer, 3 wt% of a coupling agent, 2 wt% of a dispersing agent and 1 wt% of an antioxidant.
The dripping agent is polyoxyethylene sorbitan monostearate.
The antifogging agent is an addition product of perfluoroalkyl alcohol and ethylene oxide;
the light stabilizer is a hindered amine light stabilizer;
the coupling agent is a silane coupling agent;
the dispersant is EBS;
the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite ester antioxidant 168.
The resin master batch is prepared from PBAT resin, polylactic acid, tetrabutyl titanate and an auxiliary agent.
The auxiliary agent comprises 2-chloro-3-trichloromethyl pyridine, 2,4-difluoroaniline, toluene and glacial acetic acid.
The preparation method of the anti-fogging master batch comprises the following specific steps,
s1, preparation of a resin master batch:
(1) Dissolving 2-chloro-3-trichloromethylpyridine in toluene, adding titanium tetrachloride and glacial acetic acid, refluxing and heating at 110 ℃ for 3h, distilling after the reaction is finished, and recovering fractions to obtain a product A;
(2) Cooling 2,4-difluoroaniline at 2 ℃, adding potassium carbonate, stirring, adding the product A, stirring and heating at 25 ℃, maintaining for 2min, heating at 50 ℃, reacting for 2h, heating, and extracting to obtain a product B;
(3) Dissolving potassium hydroxide and trifluorophenol in toluene, adding the product B, and stirring for 5 hours to obtain a product C;
(4) Cooling the recovered fraction at 10 ℃, introducing ammonia gas, slowly heating to 20 ℃, adding alkali liquor to adjust the pH, controlling the pH to 9, adding butanol, stirring, reacting for 1h, distilling after the reaction is finished at 195 ℃, and further obtaining a product D;
(5) Heating PBAT resin and polylactic acid, wherein the mass ratio of the PBAT resin to the polylactic acid is 2.3;
s2, mixing the resin master batch, the dripping agent, the antifogging agent, the light stabilizer, the coupling agent, the dispersing agent and the antioxidant in a high-speed mixer at 1500r/min for 15min;
and S3, adding the mixed materials into a double-screw extruder for full melt blending, controlling the melting temperature at 160 ℃ and the screw rotating speed at 100r/min, shearing and mixing for 10min, and then extruding, cooling, granulating, drying and packaging to obtain the anti-fogging master batch.
Example 3
The antifog drop master batch for the biodegradable mulching film and the preservative film is prepared from the following raw materials, by weight, 70% of resin master batch, 12% of a drip agent, 10% of an antifog agent, 5% of a light stabilizer, 0.9% of a coupling agent, 2% of a dispersing agent and 0.1% of an antioxidant.
The dripping agent is polyoxyethylene sorbitan monooleate.
The antifogging agent is perfluoroalkanolamide;
the light stabilizer is a hindered amine light stabilizer;
the coupling agent is a silane coupling agent;
the dispersant is EBS;
the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite ester antioxidant 168.
The resin master batch is prepared from PBAT resin, polylactic acid, tetrabutyl titanate and an auxiliary agent.
The auxiliary agent comprises 2-chloro-3-trichloromethyl pyridine, 2,4-difluoroaniline, toluene and glacial acetic acid.
The preparation method of the anti-fogging master batch comprises the following specific steps,
s1, preparation of a resin master batch:
(1) Dissolving 2-chloro-3-trichloromethylpyridine in toluene, adding titanium tetrachloride and glacial acetic acid, refluxing and heating at 113 ℃, reacting for 3.2h, distilling after the reaction is finished, and recovering fractions to obtain a product A;
(2) Cooling 2,4-difluoroaniline at the temperature of 3 ℃, adding potassium carbonate, stirring, adding the product A, stirring and heating at the temperature of 26 ℃, maintaining for 3min, heating, keeping the temperature at 55 ℃, reacting for 2.3h, heating, and extracting to obtain a product B;
(3) Dissolving potassium hydroxide and trifluorophenol in toluene, adding the product B, and stirring for 5.5 hours to obtain a product C;
(4) Cooling the recovered fraction at 12 ℃, introducing ammonia gas, slowly heating to 22 ℃, adding alkali liquor to adjust the pH, controlling the pH to be 9, adding butanol, stirring, reacting for 1.2h, distilling after the reaction is finished at 195 ℃, and further obtaining a product D;
(5) Heating PBAT resin and polylactic acid, wherein the mass ratio of the PBAT resin to the polylactic acid is 2.5;
s2, mixing the resin master batch, the dripping agent, the antifogging agent, the light stabilizer, the coupling agent, the dispersing agent and the antioxidant in a high-speed mixer at 1700r/min for 20min;
and S3, adding the mixed materials into a double-screw extruder, fully melting and blending, controlling the melting temperature at 170 ℃ and the screw rotating speed at 400r/min, shearing and mixing for 13min, and then extruding, cooling, granulating, drying and packaging to obtain the anti-fogging master batch.
Example 4
The antifog drop master batch for the biodegradable mulching film and the preservative film is prepared from the following raw materials, by weight, 51% of a resin master batch, 20% of a dripping agent, 20% of an antifog agent, 5% of a light stabilizer, 0.5% of a coupling agent, 3% of a dispersing agent and 0.5% of an antioxidant.
The drip agent is one of coconut diethanolamide.
The antifogging agent is a perfluoroalkanol unsaturated acid ester polymer;
the light stabilizer is a hindered amine light stabilizer;
the coupling agent is a silane coupling agent;
the dispersant is EBS;
the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite ester antioxidant 168.
The resin master batch is prepared from PBAT resin, polylactic acid, tetrabutyl titanate and an auxiliary agent.
The auxiliary agent comprises 2-chloro-3-trichloromethyl pyridine, 2,4-difluoroaniline, toluene and glacial acetic acid.
The preparation method of the anti-fogging master batch comprises the following specific steps,
s1, preparation of a resin master batch:
(1) Dissolving 2-chloro-3-trichloromethylpyridine in toluene, adding titanium tetrachloride and glacial acetic acid, refluxing and heating at 115 ℃, reacting for 3.5 hours, distilling after the reaction is finished, and recovering fractions to obtain a product A;
(2) Cooling 2,4-difluoroaniline at 4 ℃, adding potassium carbonate, stirring, adding the product A, stirring and heating at 27 ℃, keeping for 4min, heating to 60 ℃, reacting for 2.5h, heating, and extracting to obtain a product B;
(3) Dissolving potassium hydroxide and trifluorophenol in toluene, adding the product B, and stirring for 6 hours to obtain a product C;
(4) Cooling the recovered fraction at 13 ℃, introducing ammonia gas, slowly heating to 23 ℃, adding alkali liquor to adjust the pH value, controlling the pH value to be 10, adding butanol, stirring, reacting for 1.5h, distilling after the reaction is finished at 195 ℃, and further obtaining a product D;
(5) Heating PBAT resin and polylactic acid, wherein the mass ratio of the PBAT resin to the polylactic acid is 2.6;
s2, mixing the resin master batch, the dripping agent, the antifogging agent, the light stabilizer, the coupling agent, the dispersing agent and the antioxidant in a 2000r/min high-speed mixer for 30min;
and S3, adding the mixed materials into a double-screw extruder for full melt blending, controlling the melting temperature at 180 ℃ and the screw rotating speed at 600r/min, shearing and mixing for 15min, and then extruding, cooling, granulating, drying and packaging to obtain the anti-fogging master batch.
Comparative example 1
The antifog drop master batch for the biodegradable mulching film and the preservative film is prepared from the following raw materials, by weight, 51% of a resin master batch, 20% of a dripping agent, 20% of an antifog agent, 5% of a light stabilizer, 0.5% of a coupling agent, 3% of a dispersing agent and 0.5% of an antioxidant.
The drip agent is one of coconut diethanolamide.
The antifogging agent is a perfluoroalkanol unsaturated acid ester polymer;
the light stabilizer is a hindered amine light stabilizer;
the coupling agent is a silane coupling agent;
the dispersant is EBS;
the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite ester antioxidant 168.
The resin master batch is prepared from PBAT resin, polylactic acid, tetrabutyl titanate and an auxiliary agent.
The auxiliary agent comprises 2-chloro-3-trichloromethyl pyridine, 2,4-difluoroaniline, toluene and glacial acetic acid.
The preparation method of the anti-fogging master batch comprises the following specific steps,
s1, preparation of a resin master batch:
(1) Dissolving 2-chloro-3-trichloromethylpyridine in toluene, adding titanium tetrachloride and glacial acetic acid, refluxing and heating at 115 ℃, reacting for 3.5h, and distilling after the reaction is finished to obtain a product A;
(2) Cooling 2,4-difluoroaniline at 4 ℃, adding potassium carbonate, stirring, adding the product A, stirring and heating at 27 ℃, keeping for 4min, heating to 60 ℃, reacting for 2.5h, heating, and extracting to obtain a product B;
(3) Dissolving potassium hydroxide and trifluorophenol in toluene, adding the product B, and stirring for 6 hours to obtain a product C;
(4) Heating PBAT resin and polylactic acid, wherein the mass ratio of the PBAT resin to the polylactic acid is 2.6;
s2, mixing the resin master batch, the dripping agent, the antifogging agent, the light stabilizer, the coupling agent, the dispersing agent and the antioxidant in a 2000r/min high-speed mixer for 30min;
and S3, adding the mixed materials into a double-screw extruder for full melt blending, controlling the melting temperature at 180 ℃ and the screw rotating speed at 600r/min, shearing and mixing for 15min, and then extruding, cooling, granulating, drying and packaging to obtain the anti-fogging master batch.
Comparative example 2
The antifog drop master batch for the biodegradable mulching film and the preservative film is prepared from the following raw materials, by weight, 51% of a resin master batch, 20% of a dripping agent, 20% of an antifog agent, 5% of a light stabilizer, 0.5% of a coupling agent, 3% of a dispersing agent and 0.5% of an antioxidant.
The drip agent is one of coconut diethanolamide.
The antifogging agent is a perfluoroalkanol unsaturated acid ester polymer;
the light stabilizer is a hindered amine light stabilizer;
the coupling agent is a silane coupling agent;
the dispersant is EBS;
the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite ester antioxidant 168.
The resin master batch is prepared from PBAT resin, polylactic acid, tetrabutyl titanate and an auxiliary agent.
The auxiliary agent comprises 2-chloro-3-trichloromethyl pyridine, 2,4-difluoroaniline, toluene and glacial acetic acid.
The preparation method of the anti-fogging master batch comprises the following specific steps,
s1, preparation of a resin master batch:
heating PBAT resin and polylactic acid, wherein the mass ratio of the PBAT resin to the polylactic acid is 2.6;
s2, mixing the resin master batch, the dripping agent, the antifogging agent, the light stabilizer, the coupling agent, the dispersing agent and the antioxidant in a 2000r/min high-speed mixer for 30min;
and S3, adding the mixed materials into a double-screw extruder for full melt blending, controlling the melting temperature at 180 ℃ and the screw rotating speed at 600r/min, shearing and mixing for 15min, and then extruding, cooling, granulating, drying and packaging to obtain the anti-fogging master batch.
Experiment of
And (3) setting comparative example 1, comparative example 2 and comparative example 3 by taking example 4 as a control, wherein the distillate is not recycled in the comparative example 1, and the auxiliary agent is not added in the comparative example 2 to carry out a control experiment.
The resin master batches obtained in example 1, example 2, example 3, example 4, comparative example 1 and comparative example 2 were analyzed and examined, and as a result,
watch 1
The antifogging master batches obtained in examples 1, 2, 3, 4, 1 and 2 were subjected to mechanical properties (GB/T1040.3-2006), and the results were as follows
Watch two
The anti-fogging concentrate obtained in example 1, example 2, example 3, example 4, comparative example 1 and comparative example 2 was subjected to a weed control (%) test under certain conditions, and the results were as follows
| Experimental group | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 |
| Weed control | 76 | 95 | 94 | 94 | 94 | 75 |
Watch III
Table one is analyzed to conclude that the resin master batches prepared by using the raw materials and the preparation processes of examples 2, 3, 4 and 1 do not contain titanium tetrachloride, 2-chloro-3-trichloromethylpyridine and other raw materials, and have excellent safety, and in comparative example 1, tetrabutyl titanate is not detected, and the obtained tetrabutyl titanate has the advantages of enhancing the compatibility of the PBAT resin and polylactic acid, and further improving the mechanical properties of the product, which can be seen in table two.
From the analysis of table two, it is concluded that the mechanical strength of example 1 is low because the mechanical strength of the product obtained by simply adding the PBAT resin is not high, while the mechanical strength of the product can be enhanced to some extent by adding lactic acid only on the basis of the PBAT resin in comparative examples 1 and 2, but the mechanical strength is not improved ideally because of poor compatibility.
The results of the analysis of the table three show that the weed control effects of the example 2, the example 3, the example 4 and the comparative example 1 are higher than those of the example 1 and the comparative example 2, and can reach 94-95%, and the weed control effects of the example 1 and the comparative example 2 can reach 75-76%, which shows that the amide herbicides added in the example 2, the example 3, the example 4 and the comparative example 1 have obvious effects.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. An anti-fogging master batch with biodegradability for mulching films and preservative films is characterized in that: the antifogging agent master batch is prepared from the following raw materials, by weight, 50-70% of a resin master batch, 10-20% of a dripping agent, 10-20% of an antifogging agent, 1-5% of a light stabilizer, 0.5-3% of a coupling agent, 1-3% of a dispersing agent and 0.1-1% of an antioxidant;
the preparation steps of the anti-fogging master batch are as follows,
s1, mixing resin master batch, dripping agent, antifogging agent, light stabilizer, coupling agent, dispersant and antioxidant in a high-speed mixer at 1500-2000r/min for 15-30 min;
s2, adding the mixed materials into a double-screw extruder for full melt blending, controlling the melting temperature to be 160-180 ℃, controlling the rotating speed of screws to be 100-600 r/min, shearing and mixing for 10-15 min, and then extruding, cooling, granulating, drying and packaging to obtain anti-fogging master batches;
the resin master batch is a PBAT resin copolymer, and the PBAT resin copolymer is prepared from PBAT resin, polylactic acid, tetrabutyl titanate and an auxiliary agent; the auxiliary agent comprises 2-chloro-3-trichloromethyl pyridine, 2,4-difluoroaniline, toluene and glacial acetic acid;
the preparation method of the resin master batch comprises the following steps:
s1, dissolving 2-chloro-3-trichloromethylpyridine in toluene, adding titanium tetrachloride and glacial acetic acid, refluxing and heating at the temperature of 110-115 ℃ for 3-3.5h, distilling after the reaction is finished, and recovering a distillate to obtain a product A;
s2, cooling 2,4-difluoroaniline at the temperature of 2-4 ℃, adding potassium carbonate, stirring, adding the product A, stirring and heating at the temperature of 25-27 ℃, maintaining for 2-4min, heating at the temperature of 50-60 ℃, reacting for 2-2.5h, heating, and extracting to obtain a product B;
s3, dissolving potassium hydroxide and trifluorophenol in toluene, adding the product B, and stirring for 5-6 hours to obtain a product C;
s4, heating the PBAT resin and the polylactic acid at the temperature of 60-65 ℃, removing water at the temperature of 180-185 ℃, adding the product C and the product D, and uniformly stirring to obtain a resin master batch;
the preparation of product D was as follows:
cooling the recovered fraction at 10-13 deg.C, introducing ammonia gas, slowly heating at 20-23 deg.C, adding alkali solution to regulate pH, controlling pH at 9-10, adding butanol, stirring, reacting for 1-1.5 hr, distilling at 195 deg.C to obtain product D.
2. The anti-fogging concentrate for biodegradable mulching films and plastic wrap according to claim 1, wherein: the dripping agent is one of polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate and coconut oleic acid diethanolamide.
3. The anti-fogging concentrate for biodegradable mulching films and plastic wrap according to claim 1, wherein: the antifogging agent is one of perfluoroalkanol unsaturated acid ester polymer, an addition product of perfluoroalkanol and ethylene oxide and perfluoroalkanol amide;
the light stabilizer is a hindered amine light stabilizer;
the coupling agent is a silane coupling agent;
the dispersant is EBS;
the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite ester antioxidant 168.
4. The anti-fogging concentrate for biodegradable mulching films and plastic wrap according to claim 1, wherein: the mass ratio of the PBAT resin to the polylactic acid is 2.3-2.6.
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