CN110684327A - Preparation method of degradable weeding mulching film without affecting soil temperature rise - Google Patents
Preparation method of degradable weeding mulching film without affecting soil temperature rise Download PDFInfo
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- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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Abstract
The invention mainly relates to the technical field of agricultural film processing, and discloses a preparation method of a degradable weeding mulching film without affecting soil temperature rise, which comprises the following steps: modifying nano aluminum oxide, preparing mixed resin, preparing a membrane material and forming; the weeding mulching film prepared by the preparation method of the degradable weeding mulching film without affecting soil temperature rise is low in light transmittance, weeds can not grow due to lack of illumination, the soil temperature rise can not be affected, crop growth is promoted, the defects of the traditional weeding mulching film are avoided, the residual weeding mulching film after being used can be rapidly degraded after being buried, the pollution to the environment is avoided, and the degradable weeding mulching film is safe, healthy, green and environment-friendly.
Description
Technical Field
The invention mainly relates to the technical field of agricultural film processing, in particular to a preparation method of a degradable weeding mulching film without affecting soil temperature rise.
Background
The weeding mulching film is an agricultural mulching film with weeding function, which is prepared by adding black master batches or selective chemical herbicides into a common mulching film in the production process, and can be divided into a mulching film containing herbicides and a weeding mulching film containing sunlight screening agents; the mulching film containing the herbicide is divided into a single-layer weeding mulching film containing the herbicide on two sides, a double-layer weeding mulching film containing the herbicide on one side and a weeding mulching film coated with the herbicide on one side, the single-layer weeding mulching film containing the herbicide on two sides and the double-layer weeding mulching film containing the herbicide on one side are prepared by mixing the herbicide and resin raw materials to prepare master batches and then carrying out extrusion forming, the weeding mulching film can play a role in weeding after weeds grow out and contact with the mulching film, the herbicide is added in the mulching film preparation process, high-temperature treatment is needed in the preparation process, the herbicide can volatilize, certain harm can be caused to human health in the preparation and use processes, the herbicide in the weeding mulching film coated with the herbicide on one side is not added in the preparation of the master batches, the herbicide is coated on the surface layer of the mulching film after the preparation of the mulching film, the herbicide coating of the mulching film is not firm, and the herbicide, the three weeding mulching films with the herbicides are bound to be in contact with crops in the using process, certain harm is generated to the growth of the crops, and the use of the crops is obviously limited; the weeding mulching film containing the sunlight shielding agent can effectively shield light, the light transmittance can only reach about 5% generally, weeds cannot grow due to lack of light, but the weeding mulching film is a black mulching film, low-temperature rise can be influenced while the weeding mulching film shields light, certain influence can be generated on the growth of crops, and therefore the weeding mulching film which does not influence the temperature rise of soil is needed.
Along with the continuous reinforcing of environmental protection consciousness, the environmental protection is advocated to not only the industry needs, the agricultural is the same need carry out the environmental protection, and present agricultural is different with traditional agricultural, the plastic film that needs in the planting process is also more and more, but remaining plastic film can bury below the soil, cause very big pollution to the environment, influence the structure and the gas permeability of soil, it is unbalanced to cause the microbial community, make the organic matter content decline of soil and lead to crop output to descend, consequently, need a weeding plastic film that can biodegradable, make discarded plastic film can degrade, from not influencing soil structure.
The existing patent document CN106519603A discloses a biodegradable weeding mulching film and a preparation method thereof, and particularly discloses that biodegradable herbicide master batches are mixed with biodegradable resin A, the biodegradable herbicide master batches are composed of biodegradable resin B, a herbicide, a surfactant A and a surfactant B, the herbicide is added into the master batches, certain harm can be caused to a human body in the preparation and use processes, and the existence of the chemical herbicide makes microorganisms difficult to proliferate, so that the degradation speed is very slow, and the increasing use of the weeding mulching film cannot be met.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention aims to provide a preparation method of a degradable weeding mulching film without influencing the temperature rise of soil.
A preparation method of a degradable weeding mulching film without affecting soil temperature rise comprises the following steps:
(1) modifying the nano alumina, namely placing the nano alumina in a reaction kettle, slowly heating to 76 ~ 82 ℃, preserving heat for 30 ~ 40min, adding hexafluorobutyl methacrylate, heating to 135 ~ 145 ℃ while stirring, preserving heat for 10 ~ 15min, stopping heating, naturally cooling to 45 ~ 50 ℃, adding methanol with the weight of 4 ~ 5 times of that of the nano alumina, quickly stirring for 20 ~ 30min, standing at 0 ~ 4 ℃ for 6 ~ 8h, modifying the nano alumina, enhancing the intermiscibility and lubricity of the nano alumina and organic matters, facilitating film formation, improving the strength and toughness of the weeding mulching film, enabling the weeding mulching film to be repeatedly used, filtering, taking precipitate, and drying to obtain the modified nano alumina;
(2) the preparation of the mixed resin comprises the steps of uniformly mixing the mixed resin, putting the mixed resin into a reaction kettle, heating the mixed resin to 67 ~ 75 ℃ at the speed of 2 ~ 3 ℃/min, preserving the heat for 10 ~ 15min, continuously heating the mixed resin to 115 ~ 125 ℃, preserving the heat, stirring the mixed resin for 20 ~ 30min, fully mixing and melting the mixed resin, promoting film formation, and improving the strength and the degradability of the weeding mulching film to obtain the mixed resin;
(3) adding an auxiliary agent into the mixed resin, stirring in vacuum at 102 ~ 110 ℃ for 20 ~ 30min, naturally cooling to 73 ~ 79 ℃, preserving heat for 30 ~ 40min, fully mixing and grafting the auxiliary agent and the mixed resin, reducing the light transmittance of the weeding mulching film, improving the strength and toughness of the weeding mulching film and enhancing the durability, adding the modified nano-alumina, increasing the temperature to 115 ~ 121 ℃, preserving heat, stirring in vacuum for 25 ~ 35min, fully mixing the modified nano-alumina and the raw materials, wherein the nano-alumina has better infrared light absorption capacity, does not influence the soil temperature rise under the condition of preventing sunlight from penetrating the weeding mulching film, can promote the growth of crops, improve the yield of the crops, increase the wide applicability of the weeding mulching film, extruding and granulating to obtain a film material mixture;
(4) molding: and (3) placing the film material mixture in a forming machine, and extruding, casting and forming to obtain the degradable weeding mulching film without influencing soil temperature rise.
The addition amount of the hexafluorobutyl methacrylate in the step (1) is 15 ~ 17% of the weight of the nano alumina.
The mixed resin in the step (2) comprises, by weight, 35 ~ 37 parts of polylactic acid, 22 ~ 24 parts of poly (butylene terephthalate/butylene adipate) copolyester, and 11 ~ 13 parts of biodegradable starch resin.
The additive in the step (3) is added in an amount of 12 ~ 14% of the weight of the mixed resin, and is composed of the following resin in parts by weight, namely high-pigment carbon black carrier-free master batch 27 ~ 29, a surfactant 14 ~ 16 and a lubricant 8 ~ 10.
The high-pigment carbon black carrier-free master batch has the carbon black content of 65 ~ 70%.
The surfactant is one or a mixture of more of dioctyl sodium sulfosuccinate, polyoxypropylene mannitol dioleate, hexaethylene glycol monostearate, propylene glycol monolaurate and diethanol amide stearic acid monoglyceride.
The lubricant is one or a mixture of polyethylene wax, butyl stearate and ethylene bis stearamide.
The addition amount of the modified nano-alumina in the step (3) is 3 ~ 5% of the weight of the mixed resin, and the particle size is 15 ~ 20 nm.
And (3) stirring in vacuum, wherein the vacuum degree is-54 ~ -56 kPa.
The degradable weeding mulching film which does not influence the temperature rise of the soil is prepared by the preparation method of the degradable weeding mulching film which does not influence the temperature rise of the soil.
The preparation method has the advantages that the weeding mulching film prepared by the preparation method of the degradable weeding mulching film without influencing soil temperature rise is low in light transmittance, weeds can not grow due to lack of illumination, the soil temperature rise can not be influenced, crop growth is promoted, the defects of the traditional weeding mulching film are avoided, the residual weeding mulching film after being used can be rapidly degraded after being buried, environment pollution is avoided, safety and health are achieved, the weeding mulching film is green and environment-friendly, nano aluminum oxide is placed in a reaction kettle, hexafluorobutyl methacrylate is added for heating and stirring, methanol is added for standing at a low temperature, the nano aluminum oxide is modified, the intermiscibility and lubricity of the nano aluminum oxide and organic matters are enhanced, film forming can be facilitated, the strength and toughness of the weeding mulching film are improved, the mixed resin is repeatedly used, the mixed resin is formed by polylactic acid, poly (butylene phthalate/butylene adipate) copolyester and biodegradable starch resin, film forming can be promoted after full mixing and melting, the strength and degradable performance of the weeding mulching film are improved, the high-temperature vacuum stirring is performed, the mixed resin is fully mixed with the branch resin, the 352% modified mulching film is grafted, the light transmittance is improved, the nano aluminum oxide is increased, the crop growth of the nano aluminum oxide and the infrared light transmittance is increased, the nano aluminum oxide modified mulching film, the crop growth of the weeding mulching film is improved, the crop growth of the crop growth is improved, the crop growth is improved.
Detailed Description
The invention is illustrated by the following specific examples.
Example 1
A preparation method of a degradable weeding mulching film without affecting soil temperature rise comprises the following steps:
(1) modifying the nano alumina, namely placing the nano alumina in a reaction kettle, slowly heating to 76 ℃, preserving heat for 30min, adding 15% of hexafluorobutyl methacrylate, stirring and heating to 135 ℃, preserving heat for 10min, stopping heating, naturally cooling to 45 ℃, adding methanol with the weight of 4 times of that of the nano alumina, quickly stirring for 20min, standing for 6h at 0 ~ 4 ℃, modifying the nano alumina, enhancing the intermiscibility and lubricity of the nano alumina and organic matters, being convenient for film formation, improving the strength and toughness of the weeding mulching film, enabling the weeding mulching film to be repeatedly used, filtering, taking sediment and drying to obtain the modified nano alumina;
(2) preparing mixed resin: uniformly mixing the mixed resin, and placing the mixed resin in a reaction kettle, wherein the mixed resin consists of the following resins in parts by weight: heating polylactic acid 35, poly (butylene terephthalate/butylene adipate) copolyester 22 and biodegradable starch resin 11 to 67 ℃ at the speed of 2 ℃/min, preserving heat for 10min, continuously heating to 115 ℃, preserving heat and stirring for 20min, promoting film formation after full mixing and melting, and improving the strength and the degradability of the weeding mulching film to obtain mixed resin;
(3) adding an auxiliary agent into mixed resin, wherein the addition amount of the auxiliary agent is 12 percent of the weight of the mixed resin, the auxiliary agent comprises the following resins, by weight, 27 parts of high-pigment carbon black carrier-free master batch, 14 parts of surfactant and 8 parts of lubricant, the high-pigment carbon black carrier-free master batch has the carbon black content of 65 percent, the surfactant is the weight mixture of sodium dioctyl succinate sulfonate, polyoxypropylene mannitol dioleate, propylene glycol monolaurate and the like, the lubricant is polyethylene wax, the mixture is stirred at 102 ℃ for 20min in vacuum, the vacuum degree is-54 kPa, the temperature is naturally reduced to 73 ℃, the temperature is kept for 30min, the auxiliary agent and the mixed resin are fully mixed and grafted, the light transmittance of the weeding mulching film is reduced, the strength and the toughness of the weeding mulching film are improved, the durability is enhanced, the modified nano aluminum oxide is added, the addition amount is 3 percent of the weight of the mixed resin, the particle size is 15 ~ 20nm, the temperature is increased to 115 ℃, the vacuum stirring is kept for 25min, the vacuum degree is-54 kPa, the modified nano aluminum oxide is fully mixed with the raw materials, the nano aluminum oxide has better capability of absorbing infrared light, the mulching film material is prevented from penetrating through the mulching film, the growth of crops is not influenced, the;
(4) molding: and (3) placing the film material mixture in a forming machine, and extruding, casting and forming to obtain the degradable weeding mulching film without influencing soil temperature rise.
Example 2
A preparation method of a degradable weeding mulching film without affecting soil temperature rise comprises the following steps:
(1) modifying the nano alumina, namely placing the nano alumina in a reaction kettle, slowly heating to 79 ℃, preserving heat for 35min, adding 16% of hexafluorobutyl methacrylate, stirring while heating to 140 ℃, preserving heat for 13min, stopping heating, naturally cooling to 48 ℃, adding methanol which is 4.5 times of the weight of the nano alumina, quickly stirring for 25min, standing for 7h at 0 ~ 4 ℃, modifying the nano alumina, enhancing the intermiscibility and lubricity of the nano alumina and organic matters, being convenient for forming a film, improving the strength and toughness of the weeding mulching film, enabling the weeding mulching film to be repeatedly used, filtering, taking sediment and drying to obtain the modified nano alumina;
(2) preparing mixed resin: uniformly mixing the mixed resin, and placing the mixed resin in a reaction kettle, wherein the mixed resin consists of the following resins in parts by weight: polylactic acid 36, poly (butylene terephthalate/butylene adipate) copolyester 23 and biodegradable starch resin 12 are heated to 71 ℃ at the speed of 2.5 ℃/min, the temperature is kept for 13min, the materials are continuously heated to 120 ℃, the materials are stirred for 25min, and after being fully mixed and melted, the film forming can be promoted, the strength and the degradability of the weeding mulching film are improved, so that the mixed resin is obtained;
(3) adding an auxiliary agent into mixed resin, wherein the auxiliary agent is added in an amount which is 13 percent of the weight of the mixed resin, and consists of the following resins in parts by weight, namely high-pigment carbon black carrier-free master batch 28, a surfactant 15 and a lubricant 9, wherein the high-pigment carbon black carrier-free master batch contains 68 percent of carbon black, the surfactant is a mixture of polyoxypropylene mannitol dioleate, propylene glycol monolaurate, diethanolamide stearic acid monoglyceride and the like, the lubricant is butyl stearate, the mixture is stirred at 108 ℃ for 25min in vacuum, the vacuum degree is-55 kPa, the temperature is naturally reduced to 76 ℃, the temperature is kept for 35min, the auxiliary agent and the mixed resin are fully mixed and grafted, the light transmittance of the weeding mulching film is reduced, the strength and the toughness of the weeding mulching film are improved, the durability is enhanced, the modified nano aluminum oxide is added in an amount which is 4 percent of the weight of the mixed resin, the particle size is 15 ~ 20nm, the temperature is increased to 118 ℃, the vacuum stirring is carried out for 30min, the vacuum degree is-55 kPa, the modified nano aluminum oxide is fully mixed with the raw materials, the nano aluminum oxide has better capability of absorbing infrared light, the mulching film, the capability of preventing the mulching film from influencing the sunlight, the growth of the mulching film from influencing, the growth of crops is;
(4) molding: and (3) placing the film material mixture in a forming machine, and extruding, casting and forming to obtain the degradable weeding mulching film without influencing soil temperature rise.
Example 3
A preparation method of a degradable weeding mulching film without affecting soil temperature rise comprises the following steps:
(1) modifying the nano alumina, namely placing the nano alumina in a reaction kettle, slowly heating to 82 ℃, preserving heat for 40min, adding 17% of hexafluorobutyl methacrylate, stirring and heating to 145 ℃, preserving heat for 15min, stopping heating, naturally cooling to 50 ℃, adding methanol with the weight 5 times that of the nano alumina, quickly stirring for 30min, standing for 8h at 0 ~ 4 ℃, modifying the nano alumina, enhancing the intermiscibility and lubricity of the nano alumina and organic matters, being convenient for film formation, improving the strength and toughness of the weeding mulching film, enabling the weeding mulching film to be repeatedly used, filtering, taking sediment and drying to obtain the modified nano alumina;
(2) preparing mixed resin: uniformly mixing the mixed resin, and placing the mixed resin in a reaction kettle, wherein the mixed resin consists of the following resins in parts by weight: the preparation method comprises the following steps of heating polylactic acid 37, poly (butylene terephthalate/butylene oxalate) copolyester 24 and biodegradable starch resin 13 to 75 ℃ at the speed of 3 ℃/min, preserving heat for 15min, continuously heating to 125 ℃, preserving heat and stirring for 30min, fully mixing and melting to promote film formation, and improving the strength and the degradability of the weeding mulching film to obtain mixed resin;
(3) adding an auxiliary agent into mixed resin, wherein the addition amount of the auxiliary agent is 14% of the weight of the mixed resin, the auxiliary agent comprises the following resins, by weight, high-pigment carbon black carrier-free master batch 29, a surfactant 16 and a lubricant 10, the high-pigment carbon black carrier-free master batch contains 70% of carbon black, the surfactant is a mixture of dioctyl sodium sulfosuccinate, hexaethylene glycol monostearate, propylene glycol monolaurate, diethanolamide stearic acid monoglyceride and the like, the lubricant is ethylene bis stearamide, the mixture is subjected to vacuum stirring at 110 ℃ for 30min, the vacuum degree is-56 kPa, the mixture is naturally cooled to 79 ℃, the temperature is kept for 40min, the auxiliary agent and the mixed resin are fully mixed and grafted, the light transmittance of the weeding mulching film is reduced, the strength and toughness of the mulching film are improved, the durability is enhanced, the addition amount of the modified nano aluminum oxide is 5% of the weight of the mixed resin, the particle size is 15 ~ 20nm, the temperature is increased to 121 ℃, the vacuum stirring is carried out for 35min, the vacuum degree is-56 kPa, the modified nano aluminum oxide is fully mixed with the raw material, the mulching film has better sunlight absorption capacity, the crop growth is prevented from being influenced, the crop growth is not influenced, and the crop growth is improved, and the crop weeding yield is increased;
(4) molding: and (3) placing the film material mixture in a forming machine, and extruding, casting and forming to obtain the degradable weeding mulching film without influencing soil temperature rise.
Comparative example 1
The modification in step (1) was removed and nano alumina was used as it is, and the other methods were the same as in example 1.
Comparative example 2
The polylactic acid in the step (2) was 17, and the other procedures were the same as in example 1.
Comparative example 3
The carrier-free master batch of the high-pigment carbon black in the step (3) is 38, and the rest of the methods are the same as those in the example 1.
Comparative example 4
The amount of the modified nano alumina added in the step (3) is 11% by weight of the mixed resin, and the rest of the method is the same as that of the example 1.
Comparative example 5
The prior patent document CN106519603A discloses a biodegradable weeding mulching film and a preparation method thereof.
Effect of herbicidal effect of the herbicidal mulching films of examples and comparative examples:
the weeding mulching films in the examples and the comparative examples are respectively selected to weed corn, potato, pepper and cucumber, the test time is the whole growing season, the control group is soil for planting corn, potato, pepper and cucumber respectively, but no weeding mulching film and herbicide are used for natural growth, the number of weeds in 20d and 50d in the weeding mulching film and the control group is calculated respectively, the tensile strength (longitudinal/transverse)/(MPa) and the puncture strength/(N) of the weeding mulching films in each group are detected according to the method of patent document CN 105623058A, the underground buried depth is 1m, the complete degradation time is calculated, each test is repeated for 3 times, the results are averaged, and the weeding effect of the weeding mulching films in the examples and the comparative examples is shown in Table 1.
Example 1: the number of weeds in 20 days of corn is 6 plants/m2At 50 days, the number of weeds is 2/m2The yield is 713 kg/mu, and the weed number is 4 plants/m when the potatoes are 20 days old2At 50 days, the number of weeds is 1 plant/m2The yield is 6241 kg/mu, and the weed number is 6 plants/m at 20 days of pepper2At 50 days, the number of weeds is 4/m2The yield is 2674 kg/mu, and the weed number is 4 plants/m at 20 days of cucumber2At 50 days, the number of weeds is 1 plant/m2The yield is 7756 kg/mu, the tensile strength (longitudinal/transverse) is 112/119MPa, the puncture strength is 10.2N, and the complete degradation time is 97 d;
example 2: the number of weeds in 20 days of corn is 5 plants/m2Number of weeds at 50dThe amount of the strain is 1 strain/m2The yield is 739 kg/mu, the weed number is 6 plants/m when the potatoes are 20 days old2At 50 days, the number of weeds is 2/m2The yield is 6375 kg/mu, and the weed number is 5 plants/m at 20 days of hot pepper2At 50 days, the number of weeds is 2/m2The yield is 2754 kg/mu, and the weed number is 4 plants/m at 20 days of cucumber2At 50 days, the number of weeds is 2/m2The yield is 7743 kg/mu, the tensile strength (longitudinal/transverse) is 116/121MPa, the puncture strength is 10.9N, and the complete degradation time is 94 d;
example 3: the number of weeds in 20 days of corn is 6 plants/m2At 50 days, the number of weeds is 1 plant/m2The yield is 711 kg/mu, and the weed number is 5 plants/m when the potatoes are 20 days old2At 50 days, the number of weeds is 2/m2The yield is 6234 kg/mu, and the weed number is 7 plants/m at 20 days of pepper2At 50 days, the number of weeds is 3 per m2The yield is 2682 kg/mu, and the weed number is 5 plants/m at 20 days of cucumber2At 50 days, the number of weeds is 1 plant/m2The yield is 7735 kg/mu, the tensile strength (longitudinal/transverse) is 113/118MPa, the puncture strength is 10.7N, and the complete degradation time is 98 d;
comparative example 1: the number of weeds in 20 days of corn is 7 plants/m2At 50 days, the number of weeds is 2/m2The yield is 706 kg/mu, and the weed number is 5 plants/m when the potatoes are 20 days old2At 50 days, the number of weeds is 2/m2The yield is 6225 kg/mu, and the weed number is 7 plants/m at 20 days of pepper2At 50 days, the number of weeds is 2/m2The yield is 2621 kg/mu, and the weed number is 5 plants/m at 20 days of cucumber2At 50 days, the number of weeds is 1 plant/m2The yield is 7704 kg/mu, the tensile strength (longitudinal/transverse) is 110/115MPa, the puncture strength is 9.7N, and the complete degradation time is 104 d;
comparative example 2: the number of weeds in 20 days of corn is 7 plants/m2At 50 days, the number of weeds is 2/m2The yield is 695 kg/mu, and the weed number is 8 plants/m when the potatoes are 20 days old2At 50 days, the number of weeds is 3 per m2The yield is 6011 kg/mu, and the weed number is 6 plants/m at the time of pepper being 20 days2At 50 days, the number of weeds is 2/m2The yield is 2248 kg/mu, and the weed number is 6 plants/m at 20 days of cucumber2At 50 days, the number of weeds is 2/m2The yield is 7301 kg/mu, the tensile strength (longitudinal/transverse) is 101/107MPa, the puncture strength is 8.3N, and the complete degradation time is 132 d;
comparative example 3: the number of weeds in 20 days of corn is 4 plants/m2At 50 days, the number of weeds is 1 plant/m2The yield is 694 kg/mu, the weed number is 4 plants/m when the potatoes are 20 days old2At 50 days, the number of weeds is 2/m2The yield is 6007 kg/mu, and the weed number is 5 plants/m at 20 days of pepper2At 50 days, the number of weeds is 1 plant/m2The yield is 2310 kg/mu, and the weed number is 4 plants/m at 20 days of cucumber2At 50 days, the number of weeds is 1 plant/m2The yield is 7005 kg/mu, the tensile strength (longitudinal/transverse) is 98/102MPa, the puncture strength is 7.9N, and the complete degradation time is 125 d;
comparative example 4: the number of weeds in 20 days of corn is 7 plants/m2At 50 days, the number of weeds is 3 per m2The yield is 702 kg/mu, and the weed number is 6 plants/m when the potatoes are 20 days old2At 50 days, the number of weeds is 2/m2The yield is 6113 kg/mu, and the weed number is 7 plants/m at 20 days of pepper2At 50 days, the number of weeds is 2/m2The yield is 2594 kg/mu, and the weed number is 6 plants/m at 20 days of cucumber2At 50 days, the number of weeds is 2/m2The yield is 7216 kg/mu, the tensile strength (longitudinal/transverse) is 104/111MPa, the puncture strength is 9.3N, and the complete degradation time is 131 d;
comparative example 5: the number of weeds in 20 days of corn is 3 plants/m2At 50 days, the number of weeds is 8/m2The yield is 674 kg/mu, and the weed number is 2 plants/m when the potatoes are at 20 days2At 50 days, the number of weeds is 6/m2The yield is 5864 kg/mu, and the weed number is 3 plants/m at 20 days of hot pepper2At 50 days, the number of weeds is 7/m2The yield is 2206 kg/mu, and the weed number is 1 plant/m at 20 days of cucumber2At 50 days, the number of weeds is 5 plants/m2The yield is 7053 kg/mu, the tensile strength (longitudinal/transverse) is 96/106MPa, the puncture strength is 7.8N, and the complete degradation time is 97 d;
control group: the number of weeds in 20 days of corn is 87 plants/m2At 50 days, the number of weeds is 143 per m2The yield is 336 kg/mu, and the weed number is 96 plants/m at 20 days of potatoes2When 50d is mixedThe number of grass is 159/m2The yield is 2814 kg/mu, and the weed number is 83 plants/m at 20 days of hot pepper2At 50 days, the number of weeds is 137 plants/m2The yield is 1453 kg/mu, and the weed number is 92 plants/m at 20 days of cucumber2At 50 days, the number of weeds is 165 plants/m2The yield is 4204 kg/mu;
the results show that the weeding mulching film prepared by the preparation method of the degradable weeding mulching film without affecting the temperature rise of the soil still has good weeding performance after being used for a long time, has lasting effect, can obviously reduce the number of weeds and improve the crop yield, and is high in strength, strong in durability and high in degradation speed.
Claims (10)
1. A preparation method of a degradable weeding mulching film without affecting soil temperature rise is characterized by comprising the following steps:
(1) modifying nano alumina, namely placing the nano alumina in a reaction kettle, slowly heating to 76 ~ 82 ℃, preserving heat for 30 ~ 40min, adding hexafluorobutyl methacrylate, heating to 135 ~ 145 ℃ while stirring, preserving heat for 10 ~ 15min, stopping heating, naturally cooling to 45 ~ 50 ℃, adding methanol which is 4 ~ 5 times of the weight of the nano alumina, quickly stirring for 20 ~ 30min, standing at 0 ~ 4 ℃ for 6 ~ 8h, filtering, taking precipitate, and drying to obtain modified nano alumina;
(2) the preparation of the mixed resin comprises uniformly mixing the mixed resin, placing in a reaction kettle, heating to 67 ~ 75 deg.C at a speed of 2 ~ 3 deg.C/min, maintaining the temperature for 10 ~ 15min, continuously heating to 115 ~ 125 deg.C, maintaining the temperature, stirring for 20 ~ 30min to obtain mixed resin;
(3) adding the auxiliary agent into the mixed resin, stirring in vacuum at 102 ~ 110 ℃ for 20 ~ 30min, naturally cooling to 73 ~ 79 ℃, preserving heat for 30 ~ 40min, adding the modified nano-alumina, raising the temperature to 115 ~ 121 ℃, preserving heat, stirring in vacuum for 25 ~ 35min, extruding and granulating to obtain a film material mixture;
(4) molding: and (3) placing the film material mixture in a forming machine, and extruding, casting and forming to obtain the degradable weeding mulching film without influencing soil temperature rise.
2. The method for preparing the degradable weeding mulching film without influencing the temperature rise of the soil according to claim 1, wherein the hexafluorobutyl methacrylate in the step (1) is added in an amount of 15 ~ 17% of the weight of the nano aluminum oxide.
3. The preparation method of the degradable weeding mulching film without affecting soil temperature rise according to claim 1, wherein the mixed resin in step (2) comprises, by weight, 35 ~ 37 poly (lactic acid), 22 ~ 24 poly (butylene terephthalate/butylene adipate) copolyester, and 11 ~ 13 biodegradable starch resin.
4. The preparation method of the degradable weeding mulching film without affecting the temperature rise of soil according to claim 1, wherein the additive in step (3) is added in an amount of 12 ~ 14% of the weight of the mixed resin, and comprises the following resin in parts by weight, namely high-pigment carbon black carrier-free master batch 27 ~ 29, a surfactant 14 ~ 16 and a lubricant 8 ~ 10.
5. The preparation method of the degradable weeding mulching film without affecting soil temperature rise according to claim 4, wherein the high-pigment carbon black is carrier-free master batch, and the content of the carbon black is 65 ~ 70%.
6. The method for preparing the degradable herbicidal mulching film without affecting the soil temperature rise according to claim 4, wherein the surfactant is one or more of dioctyl sodium sulfosuccinate, polyoxypropylene mannitol dioleate, hexaethylene glycol monostearate, propylene glycol monolaurate and diethanolamide stearic acid monoglyceride.
7. The method for preparing the degradable weeding mulching film without affecting the temperature rise of soil according to claim 4, wherein the lubricant is one or any mixture of polyethylene wax, butyl stearate and ethylene bis stearamide.
8. The preparation method of the degradable weeding mulching film without affecting the temperature rise of the soil as claimed in claim 1, wherein the modified nano aluminum oxide in step (3) is added in an amount of 3 ~ 5% by weight of the mixed resin, and has a particle size of 15 ~ 20 nm.
9. The preparation method of the degradable weeding mulching film without affecting the temperature rise of the soil as claimed in claim 1, wherein the vacuum stirring in step (3) is performed at a vacuum degree of-54 ~ -56 kPa.
10. The degradable weeding mulching film capable of not influencing the temperature rise of the soil, which is prepared by the preparation method of the degradable weeding mulching film capable of not influencing the temperature rise of the soil according to any one of claims 1 ~ 9.
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| CN115028532A (en) * | 2021-03-05 | 2022-09-09 | 成都新朝阳作物科学股份有限公司 | Herbicide and preparation method and application thereof |
| CN115028532B (en) * | 2021-03-05 | 2023-11-21 | 成都新朝阳作物科学股份有限公司 | Herbicide and preparation method and application thereof |
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