CN114316527A - Nitrogen-containing nutritional type biodegradable modified resin and preparation method and application thereof - Google Patents
Nitrogen-containing nutritional type biodegradable modified resin and preparation method and application thereof Download PDFInfo
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- 229920005989 resin Polymers 0.000 title claims abstract description 58
- 239000011347 resin Substances 0.000 title claims abstract description 58
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- 235000016709 nutrition Nutrition 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000006731 degradation reaction Methods 0.000 claims abstract description 40
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- 238000000034 method Methods 0.000 claims abstract description 21
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- 238000002156 mixing Methods 0.000 claims description 24
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 5
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- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 2
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- Compositions Of Macromolecular Compounds (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
The invention discloses a nitrogenous nutritional type biodegradable modified resin and a preparation method and application thereof. The biodegradable modified resin comprises the following components in parts by weight: 60-90 parts of biodegradable resin, 5-25 parts of oxalyl diamine, 5-20 parts of inorganic filling powder, 0.5-2 parts of coupling agent, 10760.3 parts of antioxidant, 6260.2 parts of antioxidant, 0.2 part of erucamide and 0.3 part of white oil. The biodegradable modified resin can be processed into downstream film bag products. According to the nitrogen-containing nutritional type biodegradable modified resin, the oxalyl diamine filling component which can slowly release nitrogen nutrients and is safe and environment-friendly is innovatively added into the biodegradable modified resin, and the nitrogen nutrients necessary in the microbial propagation and crop growth processes are provided in the degradation process, so that the microbial propagation and crop growth are promoted, the degradation process of biodegradable plastic is remarkably accelerated, the crop growth is promoted, and the nitrogen-containing nutritional type biodegradable modified resin has an important significance in promoting the biodegradable plastic to play a positive role in the white pollution treatment process.
Description
Technical Field
The invention belongs to the technical field of biodegradable resin modification, relates to a blending filling modified type biodegradable modified resin, and particularly relates to a nitrogen-containing nutritional type biodegradable blending filling modified resin and a preparation method thereof.
Background
At present, the plastic pollution problem is more and more serious, and the almost permanent pollution to the natural environment is still a global crisis facing human beings and urgently awaiting solution. The biodegradable plastic has excellent use performance, and can be completely decomposed into carbon dioxide (CO) by environmental microorganisms after being discarded2) Or/and methane (CH)4)、H2O and mineralized inorganic salts containing elements thereof are in accordance with the current global environmental protection trend, and become an effective way for treating plastic pollution.
Currently, the biodegradable plastics which have been widely used mainly include polybutylene terephthalate-adipate (PBAT), polylactic acid (PLA), polybutylene succinate (PBS), and the like. Meanwhile, in order to reduce the production cost, calcium carbonate, talcum powder, calcium sulfate whisker and other cheap agents which do not influence the degradation performance of the product and can be absorbed by the environment are widely applied to the modification of degradable plastics.
The degradation process of biodegradable plastics is generally considered to comprise the following steps: (1) forming a microbial film after microorganisms are colonized on the surface of the plastic; (2) wherein substances such as microbial secretase (hydrolase or oxidoreductase) having plastic degradation ability attack the plastic surface; (3) part of long chains of the polymer are broken to generate oligomer, and the oligomer is oxidized under the action of oxygen to form oxygen-containing functional groups such as carbonyl, carboxyl, hydroxyl and the like; (4) a portion of the oligomer is released into the environment and another portion of the oligomer is taken up by the microorganism into its body; (5) Assimilation occurs under the action of in vivo metabolic mechanisms (mainly beta-oxidation mechanism and citric acid cycle); (6) final mineralization to form CO2、CH4、H2O, etc. are released into the environment.
The microbial film formed on the plastic surface by the microbial colonization is a key step in the whole biodegradation process, the microbial colonization generally comprises three stages of adhesion, propagation and diffusion, and the propagation of the microbes has important influence on the colonization and the degradation process of the biodegradable plastic. The propagation of the microorganisms generally depends on environmental factors, including temperature, humidity, oxygen content, pH value, carbon and nitrogen content and the like, under the condition that the conditions such as temperature, humidity, oxygen content, pH value and the like are relatively stable, the carbon and nitrogen content has extremely obvious influence on the growth and propagation of the microorganisms, the propagation amount of the microorganisms is small due to insufficient nitrogen, and the thalli are easy to age and autolyze due to insufficient carbon. In addition, nitrogen nutrient is also one of important elements for the growth and development and the yield of crops, and various crops need to absorb a large amount of nitrogen nutrient from the outside.
The biodegradable plastic is generally aliphatic polyester (PLA, PBS, PHA, etc.) or aliphatic-aromatic copolyester (PBAT, etc.), and organic carbon contained in the structure can be used as carbon nutrient for microbial growth and metabolism in the degradation process. The nitrogen nutrients required by the growth and metabolism of microorganisms and the growth of crops do not exist in a biodegradable plastic structure or an inorganic filling component generally, and need to be obtained from the external environment. If the biodegradable plastic can provide nitrogen nutrients required by microbial growth metabolism and crop growth, the biodegradable plastic is very beneficial to the growth of microbes and crops, and is further beneficial to the degradation process of the biodegradable plastic, the degradation period is shortened, and the growth of the crops is promoted.
Patent CN111533903A discloses a nitrogen-containing nutritional biodegradable material, a preparation method thereof and application of the nitrogen-containing nutritional biodegradable material in preparation of mulching films, wherein the purpose of introducing nitrogen elements into PBS is achieved by modifying the PBS main chain by adopting different nitrogen-containing dihydroxy compounds or amino acids, the nitrogen elements are provided while the degradation performance of the PBS is maintained, and the purposes of improving the environment and increasing the yield of crops are achieved. However, the method has long polymerization process flow, low nitrogen element introduction amount, unknown physical properties such as molecular weight of a polymerization product and uncertain practicability, and the ratio of butanediol in raw materials is as follows: succinic acid: the molar ratio of the nitrogen-containing dihydroxy organic matter is 1:1 (0-0.30), the molar contents of carboxyl and hydroxyl are different, and the nitrogen-containing organic matter can not enter the PBS main chain through polymerization reaction.
The degradation period of the existing biodegradable plastic under the condition of industrial compost generally requires that the biodegradation rate is not lower than 90 percent within not longer than 180 days at the temperature of 58 +/-2 ℃ and the relative humidity of 50-55 percent, the degradation period is relatively long, and the existing biodegradable plastic does not have other functional characteristics.
Oxalyl diamine ((CONH)2)2) The slow-release nitrogen fertilizer is a good slow-release nitrogen fertilizer containing 31.8% of nitrogen, is stable white powder, is nontoxic, has the decomposition temperature of 350 ℃, the melting point of 491 ℃ and is slightly soluble in water (the solubility of 0.016%), ammonia nitrogen is gradually released in the hydrolysis or biological decomposition process, the requirement of crops on nitrogen in the whole growth period is met, the loss caused by leaching, volatilization and denitrification of the nitrogen is reduced, the utilization rate of the nitrogen is improved, the fertilization frequency is reduced, and the labor and the time are saved. The oxalyl diamine has potential advantages in the field of blending, filling and modifying of biodegradable plastics due to safe and stable physical properties and environmental-friendly slow release characteristics, and no relevant data report exists at present.
The invention content is as follows:
aiming at the defects of the prior art, the invention aims to provide a nitrogen-containing nutritional biodegradable modified resin and a preparation method thereof, and the nitrogen-containing nutritional biodegradable modified resin has the effect of slowly releasing nitrogen nutrients in the degradation process by adding an oxalyl diamine filling component which can slowly release nitrogen nutrients and is safe and environment-friendly, promotes the propagation of microorganisms and the growth of crops, overcomes the defects of slow degradation rate and long degradation period of the existing biodegradable modified resin, shortens the degradation period and improves the yield of the crops.
Technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme.
Technical scheme A formula technical scheme
The nitrogen-containing nutritional biodegradable modified resin is characterized by comprising the following raw materials in parts by weight: 60-90 parts of biodegradable resin, 5-25 parts of oxalyl diamine, 5-20 parts of inorganic filling powder, 0.5-2 parts of coupling agent, 10760.3 parts of antioxidant, 6260.2 parts of antioxidant, 0.2 part of erucamide and 0.3 part of white oil.
Further, the biodegradable resin is polybutylene terephthalate-adipate (PBAT), polylactic acid (PLA) and polybutylene succinate (PBS).
Further, the inorganic component is talcum powder, calcium carbonate and calcium sulfate whisker.
Further, the coupling agent is JL-G02FX type amine-terminated polyol ester coupling agent and SP-1082 ultra-dispersed coupling agent.
The inorganic powder has the following defects in the filling modification process of the biodegradable modified resin: (1) easy agglomeration, resulting in uneven dispersion in the modified resin; (2) the surface has hydrophilic and oleophobic properties, the compatibility with raw material resin is poor, the interface bonding force is weak, the mechanical properties of the modified resin are reduced (including tensile strength, impact strength, elongation at break and the like), the application effect is influenced, and the effect is more obvious along with the increase of the filling amount. Therefore, the coupling agent (JL-G02FX type amino-terminated polyol ester coupling agent, SP-1082 ultra-dispersed coupling agent) is selected, multiple functions of the coupling agent, the efficient dispersing agent, the processing aid and the like are integrated, the surface of the inorganic powder is treated, the interface compatibility of the inorganic filling powder and the raw material resin is improved, the dispersibility of the inorganic powder in the modified resin is enhanced, and the mechanical property of the modified resin is finally improved.
In the formula, the antioxidant is mainly used for inhibiting thermal degradation and thermo-oxidative degradation side reaction of the biodegradable resin in the processing process. The erucamide is a slipping agent and is mainly used for improving the slipping property of the surface of the product. The white oil is mainly used for coating powder and raw material resin.
The beneficial effects and mechanism of the formula technical scheme are as follows:
compared with the existing biodegradable modified resin, the biodegradable modified resin prepared by the invention is added with the oxalyl diamine filling component which can slowly release nitrogen nutrients and has stable performance, safety and environmental protection, can slowly release and provide the necessary nitrogen nutrients in the microbial propagation and crop growth processes in the degradation process of the biodegradable resin, and promotes the microbial propagation and crop growth, thereby obviously accelerating the degradation process of the biodegradable plastic, shortening the degradation period, promoting the crop growth, and having important significance for promoting the biodegradable plastic to play a positive role in the white pollution treatment process. In addition, oxalyldiamide has the characteristic of slightly dissolving in water (the solubility is 0.016%), and during the degradation process, the biodegradable modified resin can be promoted to break and disintegrate through slow dissolution, so that the degradation process is further accelerated.
The inorganic powder is pretreated and then is mixed with raw material resin for granulation to complete the preparation of the final product. The product of the invention is applied to crops and horticultural crops and can accelerate the growth of the crops.
On one hand, the innovation of the invention is that the oxalyl diamine filling component which can slowly release nitrogen nutrients, has stable performance, is safe and environment-friendly is added in the formula design, so that the biodegradable modified resin has the nutritional characteristic.
Technical scheme II technical scheme
Based on the technical scheme of the formula, the invention further discloses a preparation process for further optimizing the comprehensive performance of the modified resin. The preparation method of the nitrogenous nutritional biodegradable modified resin is characterized by comprising the following preparation steps:
(1) adding oxalyl diamine and inorganic filling powder into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 5-10 minutes at 90-100 ℃, then metering and adding a coupling agent, and finally stirring for 10 minutes at a high speed of 1000rpm to prepare the activated mixed powder.
(2) And (2) fully and uniformly mixing the biodegradable resin, the antioxidant, the erucamide and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature at 160-180 ℃, melting, blending, air-cooling and granulating to prepare the biodegradable modified resin with the adjustable degradation process.
Three application values of technical scheme
Further, the method comprisesThe innovation is that downstream film bag products are processed and manufactured by the material, and can be fully degraded into CO under the condition of industrial compost or natural environment after being discarded2、H2O, etc. by utilizing the characteristics of nitrogen nutrients of the fertilizer, the degradation process can be accelerated, the degradation period can be shortened, and the growth of crops can be accelerated. Therefore, the method has positive significance for solving white pollution and improving crop yield.
Detailed Description
Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. In the examples, parts are parts by mass. The biodegradable resin, oxalyl diamine, inorganic powder (talcum powder, calcium carbonate and calcium sulfate whisker), antioxidant (1076 and 626), coupling agent (JL-G02FX type amine-terminated polyol ester coupling agent, SP-1082 ultra-dispersed coupling agent), erucamide and white oil used in the examples can be directly purchased from the market. The equipment used in the examples is equipment conventionally available in the art.
The invention discloses a nitrogenous nutritional biodegradable modified resin material, a method for preparing the nitrogenous nutritional biodegradable modified resin, and discloses: the nitrogenous nutritional type biodegradable modified resin material is processed and prepared into downstream film bag products which can be used in the fields of packaging, agriculture and the like, and can be fully degraded into CO under the condition of industrial compost or in the natural environment after being discarded2、H2O, etc. by utilizing the characteristics of nitrogen nutrients of the fertilizer, the degradation process can be accelerated, the degradation period can be shortened, and the growth of crops can be accelerated. Therefore, the method has positive significance for solving white pollution and promoting crop growth. In order to make those skilled in the art better understand the above-mentioned solution of the present invention, the following will clearly and completely describe the technical solution of the present invention with reference to the embodiments of the present invention, 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the present invention.
Example 1:
(1) adding 5 parts of oxalyl diamine and 20 parts of talcum powder into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 10 minutes at 90 ℃, then adding 0.5 part of JL-G02FX type amine-terminated polyol ester coupling agent in a metering manner, and finally stirring for 10 minutes at 1000rpm to prepare activated mixed powder.
(2) And (2) fully and uniformly mixing 70 parts of PBAT, 5 parts of PLA, 0.3 part of antioxidant 1076, 0.2 part of antioxidant 626, 0.2 part of erucamide, 0.3 part of white oil and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature to be 180 ℃, melting, co-mixing, air-cooling and granulating to prepare the biodegradable modified resin with the adjustable degradation process.
Example 2:
(1) adding 10 parts of oxalyl diamine and 15 parts of calcium carbonate into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 8 minutes at 95 ℃, then adding 1 part of SP-1082 super-dispersion coupling agent in a metering manner, and finally stirring for 10 minutes at 1000rpm at high speed to prepare the activated mixed powder.
(2) And (2) fully and uniformly mixing 70 parts of PBAT, 5 parts of PBS, 0.3 part of antioxidant 1076, 0.2 part of antioxidant 626, 0.2 part of erucamide, 0.3 part of white oil and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature to be 160 ℃, and carrying out melt blending and air cooling granulation to prepare the biodegradable modified resin with the adjustable degradation process.
Example 3:
(1) adding 20 parts of oxalyl diamine and 10 parts of calcium sulfate whisker into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 5 minutes at 100 ℃, then adding 2 parts of SP-1082 super-dispersion coupling agent in a metering manner, and finally stirring for 10 minutes at 1000rpm at high speed to prepare the activated mixed powder.
(2) And (2) fully and uniformly mixing 60 parts of PBAT, 5 parts of PBS, 5 parts of PLA, 0.3 part of antioxidant 1076, 0.2 part of antioxidant 626, 0.2 part of erucamide, 0.3 part of white oil and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature to be 175 ℃, carrying out melt blending, air-cooling and granulating, and preparing the biodegradable modified resin with the adjustable degradation process.
Example 4:
(1) adding 25 parts of oxalyl diamine and 10 parts of calcium carbonate into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 5 minutes at 100 ℃, then adding 2 parts of SP-1082 super-dispersion coupling agent in a metering manner, and finally stirring for 10 minutes at 1000rpm at high speed to prepare the activated mixed powder.
(2) And (2) fully and uniformly mixing 55 parts of PBAT, 5 parts of PBS, 5 parts of PLA, 0.3 part of antioxidant 1076, 0.2 part of antioxidant 626, 0.2 part of erucamide, 0.3 part of white oil and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature to be 175 ℃, carrying out melt blending, air-cooling and granulating, and preparing the biodegradable modified resin with the adjustable degradation process.
Comparative experiment 1:
(1) adding 25 parts of talcum powder into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 10 minutes at 90 ℃, then adding 0.5 part of JL-G02FX type amino-terminated polyol ester coupling agent in a metering manner, and finally stirring for 10 minutes at 1000rpm to prepare the activated mixed powder.
(2) And (2) fully and uniformly mixing 70 parts of PBAT, 5 parts of PLA, 0.3 part of antioxidant 1076, 0.2 part of antioxidant 626, 0.2 part of erucamide, 0.3 part of white oil and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature to be 180 ℃, melting, co-mixing, air-cooling and granulating to prepare the biodegradable modified resin with the adjustable degradation process.
Comparative experiment 2:
(1) adding 25 parts of calcium carbonate into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 8 minutes at 95 ℃, then adding 1 part of SP-1082 ultra-dispersed coupling agent in a metering manner, and finally stirring for 10 minutes at a high speed of 1000rpm to prepare the activated mixed powder.
(2) And (2) fully and uniformly mixing 70 parts of PBAT, 5 parts of PBS, 0.3 part of antioxidant 1076, 0.2 part of antioxidant 626, 0.2 part of erucamide, 0.3 part of white oil and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature to be 160 ℃, and carrying out melt blending and air cooling granulation to prepare the biodegradable modified resin with the adjustable degradation process.
Comparative experiment 3:
(1) adding 30 parts of calcium sulfate whisker into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 5 minutes at 100 ℃, then metering and adding 2 parts of SP-1082 ultra-dispersed coupling agent, and finally stirring for 10 minutes at high speed of 1000rpm to prepare the activated mixed powder.
(2) And (2) fully and uniformly mixing 60 parts of PBAT, 5 parts of PBS, 5 parts of PLA, 0.3 part of antioxidant 1076, 0.2 part of antioxidant 626, 0.2 part of erucamide, 0.3 part of white oil and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature to be 175 ℃, carrying out melt blending, air-cooling and granulating, and preparing the biodegradable modified resin with the adjustable degradation process.
Comparative experiment 4:
(1) adding 35 parts of calcium carbonate into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 5 minutes at 100 ℃, then metering and adding 2 parts of SP-1082 ultra-dispersed coupling agent, and finally stirring for 10 minutes at high speed of 1000rpm to prepare the activated mixed powder.
(2) And (2) fully and uniformly mixing 55 parts of PBAT, 5 parts of PBS, 5 parts of PLA, 0.3 part of antioxidant 1076, 0.2 part of antioxidant 626, 0.2 part of erucamide, 0.3 part of white oil and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature to be 175 ℃, carrying out melt blending, air-cooling and granulating, and preparing the biodegradable modified resin with the adjustable degradation process.
The biodegradation rate and the crop growth of the biodegradable modified resin prepared in the embodiments 1 to 4 and the comparative experiments 1 to 4 of the invention are respectively tested, and specific test data are shown in the following tables 1 and 2.
TABLE 1 biodegradation Rate test results
TABLE 2 crop Biomass test (Soybean and corn)
From the above data, it can be seen that the nitrogen-containing nutritional biodegradable resin (examples 1-4) of the present invention has excellent biodegradability, significantly accelerated biodegradation rate, and significantly shortened degradation period, and compared with comparative tests 1-4, the present invention has 90% biodegradation rate, and the examples of the present invention have about 40 days less than comparative tests at the fastest speed. In terms of the effect of crop growth, the nitrogen-containing nutritional type biodegradable resins (examples 1 to 4) of the present invention were increased to various degrees compared to comparative experiments 1 to 4 by testing the biomass of corn and soybean, indicating that there is an effect of promoting crop growth.
In summary, the invention discloses a nitrogen-containing nutritional biodegradable modified resin, which is added with oxalyl diamine filling components capable of slowly releasing nitrogen nutrients and being safe and environment-friendly through a blending modification process, so that the purpose of introducing nitrogen nutrients into the modified resin is achieved, and the modified resin has the additional effect of slowly releasing and providing nitrogen nutrients on the basis of keeping the biodegradation characteristic. The nitrogen nutrient necessary in the microbial propagation and crop growth processes is provided in a sustained-release manner in the degradation process, and the propagation of the microbes and the growth of the crops are promoted, so that the degradation process of the biodegradable plastic is remarkably accelerated, the degradation period is shortened, the growth of the crops is accelerated, and the method has positive significance for solving the white pollution and improving the crop yield.
The method for calculating the biodegradation rate in the embodiment of the invention comprises the following steps:
reference is made to the national standard GB/T19277.1-2011 "determination of the ultimate aerobic biological decomposition capacity of a material under controlled composting conditions" part 1 of the method for determining the carbon dioxide released: general procedure the aerobic biodegradation test of the above examples (temperature 58. + -. 2 ℃ C., humidity 50-55%) was carried out in a biodegradation rate tester (model LZS-003) and the percent biodegradation Dt (%) -was calculated by the following formula
Dt＝[(CO2)T-(CO2)B]/ThCO2×100
In the formula:
(CO2)T-the cumulative carbon dioxide content emitted for each compost container containing the modified resin mixture of the examples and comparative tests, in grams per container (g/container);
(CO2)B-average cumulative carbon dioxide emissions from the blank container in grams per container (grams/container);
ThCO2examples and comparative tests modified resins produced theoretical emissions of carbon dioxide in grams per container (g/container);
the empty container was approximately 600g of fully aerated compost produced by a normally operating aerobic composting apparatus. Examples and comparative tests the compost container of the modified resin mixture was about 100 grams dry weight of the modified resin mixture of examples and comparative tests, with the remainder being 600 grams of compost as in the blank container.
The method for calculating the crop biomass in the embodiment of the invention comprises the following steps:
the modified resins (500 mesh, 200g) of examples 1 to 4 and comparative experiments 1 to 4 were added to fully aerated compost in a proportion of 25% by mass, and mixed uniformly, and then each part of the modified resin and compost mixture was placed in 3L containers, and 100 corn or soybean seeds were sown in each container, and all the containers were placed in a greenhouse, and shading treatment was performed during germination of the seeds, and after 50% germination rate, growth test was started, with room temperature controlled at 25. + -. 3 ℃ in the daytime, 20. + -. 3 ℃ in the nighttime, 70. + -. 5% in the daytime, 90. + -. 5% in the nighttime, and illumination intensity at 350. + -. 50. mu. mol/m2(greenhouse top measurements), 25 days later the test was finished. Collecting the overground part of the crop, removing attached soil, drying at 60 ℃ for 6 hours, cooling and weighing the biomass of the corn and soybean crop.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. The nitrogen-containing nutritional biodegradable modified resin is characterized by comprising the following raw materials in parts by weight: 60-90 parts of biodegradable resin, 5-25 parts of oxalyl diamine, 5-20 parts of inorganic filling powder, 0.5-2 parts of coupling agent, 10760.3 parts of antioxidant, 6260.2 parts of antioxidant, 0.2 part of erucamide and 0.3 part of white oil.
2. The nitrogen-containing nutritional biodegradable modified resin of claim 1, wherein the biodegradable resin is polybutylene terephthalate-adipate, polylactic acid or polybutylene succinate, and any combination thereof.
3. The nitrogen-containing nutritional biodegradable modified resin as claimed in claim 1, wherein the inorganic component is talc, calcium carbonate or calcium sulfate whisker, or any combination thereof.
4. The nitrogen-containing nutritional biodegradable modified resin as claimed in claim 1, wherein the coupling agent is JL-G02FX amine-terminated polyol ester coupling agent or SP-1082 ultra-dispersible coupling agent, or a combination thereof.
5. The method for preparing the nitrogen-containing nutritional type biodegradable modified resin according to claim 1, comprising the following preparation steps:
(1) adding oxalyl diamine and inorganic filling powder into a high-speed mixer, setting the rotating speed of the high-speed mixer to be 500rpm, preheating for 5-10 minutes at 90-100 ℃, then metering and adding a coupling agent, and finally stirring for 10 minutes at a high speed of 1000rpm to prepare activated mixed powder;
(2) and (2) fully and uniformly mixing the biodegradable resin, the antioxidant, the erucamide and the activated mixed powder prepared in the step (1), adding the mixture into a parallel double-screw extruder, setting the temperature at 160-180 ℃, melting, blending, air-cooling and granulating to prepare the biodegradable modified resin with the adjustable degradation process.
6. An application of nitrogen-containing nutritional type biodegradable modified resin in industrial compost.
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