CN109135230B - Preparation method of mulching film for fruiting period of crisp pears - Google Patents
Preparation method of mulching film for fruiting period of crisp pears Download PDFInfo
- Publication number
- CN109135230B CN109135230B CN201810927762.4A CN201810927762A CN109135230B CN 109135230 B CN109135230 B CN 109135230B CN 201810927762 A CN201810927762 A CN 201810927762A CN 109135230 B CN109135230 B CN 109135230B
- Authority
- CN
- China
- Prior art keywords
- mulching film
- stirring
- fruiting period
- soil
- crisp pears
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/14—Greenhouses
- A01G9/1438—Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/06—Unsaturated polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2427/06—Homopolymers or copolymers of vinyl chloride
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Protection Of Plants (AREA)
Abstract
The invention discloses a preparation method of a mulching film for a fruiting period of crisp pears, which comprises the following steps: performing irradiation degradation on polylactic acid, exhausting air and degassing, adding sepiolite and a silane coupling agent, grinding, adding polyvinyl chloride wax, and stirring to obtain a prefabricated material; stirring the prefabricated material and polyethylene succinate, heating, adding a plasticizer, a cross-linking agent and a heat stabilizer, continuously stirring, heating, adding a photoinitiator and a filler, continuously stirring, cooling to room temperature in a stirring state, and performing blow molding to form a film to obtain the mulching film for the pear fruiting period. The mulching film disclosed by the invention is tear-resistant, impact-resistant and excellent in mechanical property, can simulate the covering cultivation effect of a sandy field, effectively reduces the evaporation loss of soil moisture, promotes the growth of pear trees, effectively promotes the accumulation of sugar in crisp pears, improves the quality of crisp pears, can be completely degraded under natural conditions, and degraded components can be used as fertilizers to return to the nature and improve the soil to form a loose and porous structure, so that the air permeability and water permeability of the soil are improved.
Description
Technical Field
The invention relates to the technical field of agricultural mulching films, in particular to a preparation method of a mulching film for a pear fruiting period.
Background
Crisp pears are originally produced in Dangshan, the oldest local pear variety, are juicy and crisp, have rich nutrition and no public nuisance, contain sugar, mineral substances, organic acids and various vitamins, have extremely rich nutrition, are rare good fruit products, can be processed into pear wine, pear paste, pear sugar, cans and the like besides fresh foods, and are important raw materials for the food industry.
The crisp pears contain rich B vitamins, and can protect the heart, relieve fatigue, enhance the vitality of cardiac muscle and reduce blood pressure; the sugar and tannic acid contained in the crisp pears can eliminate phlegm and relieve cough, and has the function of maintaining throat; the crisp pears also contain more saccharides and various vitamins, are easy to be absorbed by human bodies, increase appetite and have the protection effect on the liver; meanwhile, the crisp pears are cool in nature and can clear heat and calm, and if people eat the crisp pears frequently, the blood pressure can be recovered, and symptoms such as light headedness and the like can be improved. The pear can prevent atherosclerosis, inhibit the formation of carcinogen nitrosamine, and prevent and treat cancer; the pectin content in the crisp pears is very high, which is helpful for digestion and defecation, is a daily favorite auxiliary agent for people, and is popular with consumers at home and abroad.
Crisp pears are planted to have special dependence on soil, crisp pears are continuously developed, stably-increased productivity is obtained, durability of good soil is guaranteed, soil with deep soil layers, fertile soil and loose soil is selected as much as possible, sandy soil is used for covering and cultivating, evaporation loss of soil moisture can be effectively reduced, the inhibition effect of water shortage on fruit tree growth results is relieved, robust growth of fruit trees is promoted, temperature difference can be increased by covering sandy soil, accumulation of sugar in fruits is effectively increased, fruit quality is improved, sandy soil covering is large, covering sand is easy to run off along with natural disasters, sandy soil loss can be caused if severe environments such as wind scraping and rain are encountered, yield of crisp pears is directly reduced, and taste of the obtained crisp pears is poor.
The mulching film, i.e. the ground covering film, is usually a transparent or black polyvinyl chloride film, and is used for ground covering to improve the soil temperature, keep the soil moisture and maintain the soil structure, so how to effectively utilize the mulching film in crisp pear planting to increase the yield and quality of crisp pears is necessary to improve the soil structure of crisp pears.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a preparation method of a mulching film for the fruiting period of crisp pears, the obtained mulching film is tear-resistant, impact-resistant and excellent in mechanical property, can simulate the covering and cultivating effect of a sand field, effectively reduces the evaporation loss of soil moisture, promotes the growth of pear trees, effectively promotes the accumulation of sugar in the crisp pears, improves the quality of the crisp pears, can be completely degraded under natural conditions, and can be used as a fertilizer to return to the nature and improve the soil to form a loose and porous structure, so that the air permeability and the water permeability of the soil are improved.
The invention provides a preparation method of a mulching film for a fruiting period of crisp pears, which comprises the following steps:
s1, subjecting polylactic acid to irradiation degradation, exhausting air and degassing, adding sepiolite and a silane coupling agent, grinding, adding polyvinyl chloride wax, and stirring to obtain a prefabricated material;
and S2, stirring the prefabricated material and the polyethylene succinate, heating, adding the plasticizer, the cross-linking agent and the heat stabilizer, continuously stirring, heating, adding the photoinitiator and the filler, continuously stirring, cooling to room temperature in a stirring state, and performing blow molding to form the mulching film for the fruiting period of the crisp pears.
Preferably, the irradiation dose in the irradiation degradation process of the polylactic acid S1 is 0.40-0.46 MGy.
Preferably, in S1, grinding to a particle size of 20-40 μm.
Preferably, in S1, the weight ratio of polylactic acid, sepiolite, silane coupling agent and polyvinyl chloride wax is 20-40: 1-5: 1-2: 3-5.
Preferably, in S2, the stirring time of the preformed material and the polyethylene succinate is 10-16min, the stirring speed is 1200-1400r/min, and the stirring temperature is 100-120 ℃.
Preferably, in S2, the temperature is raised to 140-148 ℃, then the plasticizer, the cross-linking agent and the heat stabilizer are added and stirred for 10-20min, the temperature is raised to 155-164 ℃, and the photoinitiator and the filler are added and stirred for 20-40 min.
Preferably, in S2, the stirring state is decreased to room temperature, and the temperature decrease speed is 2-5 ℃/min.
Preferably, in S2, the temperature for blow molding the film is 150-160 ℃.
Preferably, in S2, the thickness of the obtained mulching film for the pear fruiting period is 5-15 μm.
Preferably, in S2, the weight ratio of the preform, the polyethylene succinate, the plasticizer, the crosslinking agent, the heat stabilizer, the photoinitiator and the filler is 10-20: 22-35: 1-2: 1-2: 1-2: 1-2: 8-20.
Preferably, in S2, the photoinitiator is at least one of iron acetylacetonate, iron 2-hydroxy-4-methylacetophenone oxime, and iron stearate.
Preferably, in S2, the plasticizer is magnesium stearate and/or calcium stearate.
Preferably, in S2, the filler is at least one of diatomite, medical stone powder and zeolite powder.
Preferably, in S2, the filler comprises, by weight: 2-6 parts of diatomite, 1-2 parts of medical stone powder and 5-12 parts of zeolite powder.
Preferably, in S2, the crosslinking agent is zinc diacrylate.
In S1, polylactic acid is degraded by irradiation, a large number of active hydroxyl groups and carboxyl groups are formed on the surface, sepiolite is grafted under the action of a silane coupling agent, and a special core-shell structure with tough inside and hard outside is formed, so that on one hand, the special structure makes up the defect that polylactic acid is brittle, the tear resistance and impact strength of the prefabricated material obtained by the invention can be effectively improved, the film forming effect can be improved, on the other hand, the sepiolite powder is grafted on the surface of the polylactic acid chain structure, the defect that the sepiolite powder is extremely soft after absorbing water can be made up, and the film forming effect is further enhanced; in S2, the prefabricated material and the polyethylene succinate are compounded and uniformly dispersed, and the filler is dispersed in the mixture, so that the filling is dense, the sealing effect is excellent after curing, the cost investment can be reduced, the addition of the main material is reduced, and a large amount of mineral substances can be provided for soil after degradation, so that the environment is not polluted, and the method is safe and environment-friendly.
The mulching film obtained by the invention is nontoxic, harmless, sanitary, wide in application and good in processing performance, can be completely degraded under natural conditions by adopting the prefabricated material and the polyethylene succinate as main materials, thoroughly solves the problem of white pollution, can return to nature as a fertilizer after being degraded, improves soil, promotes the development of circular economy and ecological agriculture, has simple production process, can realize large-scale automatic continuous production, does not produce any waste gas, waste water or waste residue in the production process, and does not pollute the environment.
The crisp pears generally bloom and set in the first 4 th of spring, and the fruits mature in the first 9 th of spring, the requirement on soil quality is extremely high in the period, meanwhile, the requirement on nutrient content is extremely high in the period, and after a large amount of soil nutrients are absorbed in the general fruiting period, the soil is extremely barren, so that the later recovery and trimming of the pear trees are influenced; the mulching film obtained by the invention covers the soil surface in the fruiting period of the crisp pears, on one hand, the mulching cultivation effect of the sand field can be simulated, the evaporation loss of soil moisture is effectively reduced, the inhibition effect of water shortage on the growth result of the crisp pears in the fruiting period is relieved, the growth of pear trees is promoted, the accumulation of sugar in the crisp pears is effectively promoted, the quality of the crisp pears is improved, on the other hand, the engineering quantity is small, the mulching film obtained by the invention is directly paved on the soil surface, the mulching film is tear-resistant and impact-resistant, the mechanical property is excellent, the mulching film is different from used sandy soil, is not easy to run off along with natural disasters, the influence caused by severe weather such as wind, rain.
After the crisp pears are ripe and harvested, the mulching film obtained by the invention can be buried on the spot, not only is time and labor saved, but also can be completely degraded, the degraded residual substances can improve the soil to form a loose and porous structure, rich porosity and a loose soil structure, the air permeability and the water permeability of the soil are improved, the oxygen content in the soil is effectively adjusted, good inhabitation, survival and reproduction places are provided for the survival of microorganisms, energy is provided for the oxidation process of the microorganisms, the living environment of the soil microorganisms is effectively improved, on one hand, the high activity of the soil microorganisms can promote the decomposition of soil humus and increase the content of organic carbon in the soil, on the one hand, the degradation products can adsorb organic molecules in the soil, the organic polymerization of small molecules is promoted to form organic soil through the surface catalytic activity, on the other hand, the surface of the prefabricated material has higher microbial inertia and is difficult to be decomposed, the cation exchange capacity of the whole soil can be improved, the oxygen-containing functional groups on the surface of the soil increase the cation exchange performance, the absorption of nutrients is enhanced, and the leaching and loss of the soil nutrients are reduced.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A preparation method of a mulching film for a pear fruiting period comprises the following steps:
s1, performing radiation degradation on 20kg of polylactic acid, wherein the radiation dose is 0.46MGy, exhausting air and degassing, adding 1kg of sepiolite and 2kg of silane coupling agent, grinding to the particle size of 20-40 mu m, adding 3kg of polyvinyl chloride wax, and stirring for 16min at the stirring speed of 4200r/min to obtain a prefabricated material;
s2, stirring 20kg of the prefabricated material and 22kg of polyethylene succinate for 16min at a stirring speed of 1200r/min and a stirring temperature of 120 ℃, then heating to 140 ℃, adding 2kg of calcium stearate, 1kg of zinc diacrylate and 2kg of heat stabilizer, continuing stirring for 10min, heating to 164 ℃, adding 1kg of ferric stearate and 20kg of medical stone powder, continuing stirring for 20min, then cooling to room temperature at a speed of 5 ℃/min in a stirring state, performing blow molding to form a film, wherein the blow molding film forming temperature is 150 ℃, and obtaining the mulching film for the fruiting period of the crisp pears, wherein the thickness of the mulching film is 5-15 mu m.
Example 2
A preparation method of a mulching film for a pear fruiting period comprises the following steps:
s1, performing irradiation degradation on 40kg of polylactic acid, wherein the irradiation dose is 0.40MGy, exhausting air and degassing, adding 5kg of sepiolite and 1kg of silane coupling agent, grinding to the particle size of 20-40 mu m, adding 5kg of polyvinyl chloride wax, and stirring for 10min at the stirring speed of 4500r/min to obtain a prefabricated material;
s2, stirring 10kg of prefabricated material and 35kg of polyethylene succinate for 10min at a stirring speed of 1400r/min and a stirring temperature of 100 ℃, then heating to 148 ℃, adding 1kg of magnesium stearate, 2kg of zinc diacrylate and 1kg of heat stabilizer, continuing stirring for 20min, heating to 155 ℃, adding 2kg of 2-hydroxy-4-methyl acetophenone oxime iron and 8kg of zeolite powder, continuing stirring for 40min, cooling to room temperature at a speed of 2 ℃/min in a stirring state, and performing blow molding to form a film, wherein the temperature of the blow molding film is 160 ℃, so that the mulching film for the pear fruiting period with the thickness of 5-15 mu m is obtained.
Example 3
A preparation method of a mulching film for a pear fruiting period comprises the following steps:
s1, performing irradiation degradation on 25kg of polylactic acid, wherein the irradiation dose is 0.44MGy, exhausting air and degassing, adding 2kg of sepiolite and 1.8kg of silane coupling agent, grinding to the particle size of 20-40 mu m, adding 3.5kg of polyvinyl chloride wax, and stirring for 14min at the stirring speed of 4300r/min to obtain a prefabricated material;
s2, stirring 18kg of the prefabricated material and 26kg of polyethylene succinate for 14min at a stirring speed of 1250r/min and a stirring temperature of 115 ℃, then heating to 142 ℃, adding 1kg of magnesium stearate, 0.7kg of calcium stearate, 1.2kg of zinc diacrylate and 1.7kg of heat stabilizer, continuing stirring for 13min, heating to 162 ℃, adding 1.4kg of ferric acetylacetonate, 10kg of diatomite and 8kg of medical stone powder, continuing stirring for 25min, then cooling to room temperature at a speed of 4 ℃/min in a stirring state, forming a film by blowing, wherein the film forming temperature by blowing is 152 ℃, and obtaining the mulching film with a thickness of 10 mu m for the pear bearing period.
Example 4
A preparation method of a mulching film for a pear fruiting period comprises the following steps:
s1, 35kg of polylactic acid is subjected to radiation degradation, the radiation dose is 0.42MGy, air is exhausted for degassing, 4kg of sepiolite and 1.2kg of silane coupling agent are added, the mixture is ground until the particle size is 20-40 mu m, 4.5kg of polyvinyl chloride wax is added, the mixture is stirred for 12min, and the stirring speed is 4400r/min, so that a prefabricated material is obtained;
s2, stirring 12kg of prefabricated material and 30kg of polyethylene succinate for 12min at a stirring speed of 1350r/min and a stirring temperature of 105 ℃, then heating to 146 ℃, adding 0.5kg of magnesium stearate, 0.8kg of calcium stearate, 1.8kg of zinc diacrylate and 1.3kg of heat stabilizer, continuing stirring for 17min, then heating to 158 ℃, adding 1.6kg of photoinitiator, 5kg of medical stone powder and 5kg of zeolite powder, continuing stirring for 35min, then cooling to room temperature at a speed of 3 ℃/min under a stirring state, performing blow molding to form a film, and obtaining the mulching film with a thickness of 10 mu m for the pear bearing period.
Example 5
A preparation method of a mulching film for a pear fruiting period comprises the following steps:
s1, performing irradiation degradation on 30kg of polylactic acid, wherein the irradiation dose is 0.43MGy, exhausting air and degassing, adding 3kg of sepiolite and 1.5kg of silane coupling agent, grinding to the particle size of 20-40 mu m, adding 4kg of polyvinyl chloride wax, and stirring for 13min at the stirring speed of 4350r/min to obtain a prefabricated material;
s2, stirring 15kg of the prefabricated material and 28kg of polyethylene succinate for 13min at a stirring speed of 1300r/min and a stirring temperature of 110 ℃, then heating to 144 ℃, adding 0.75kg of magnesium stearate, 0.75kg of calcium stearate, 1.5kg of zinc diacrylate and 1.5kg of heat stabilizer, continuing stirring for 15min, then heating to 160 ℃, adding 0.7kg of ferric acetylacetonate, 0.8kg of 2-hydroxy-4-methyl acetophenone oxime iron and 14kg of filler, continuing stirring for 30min, then cooling to room temperature at a speed of 3.5 ℃/min under a stirring state, performing blow molding to form a film, wherein the temperature of the blow molding film is 155 ℃, and obtaining the mulching film with a thickness of 10 mu m and used for the fruiting period of the crisp pears.
The filler is prepared from diatomite, medical stone powder and zeolite powder in a weight ratio of (2-6): 1-2: 5-12 are mixed to obtain the product.
Comparative example 1
A preparation method of a degradable agricultural mulching film comprises the following steps:
s1, performing irradiation degradation on 30kg of polylactic acid, wherein the irradiation dose is 0.43MGy, exhausting air and degassing, adding 3kg of sepiolite and 1.5kg of silane coupling agent, grinding to the particle size of 20-40 mu m, adding 4kg of polyvinyl chloride wax, and stirring for 13min at the stirring speed of 4350r/min to obtain a prefabricated material;
s2, stirring 15kg of the prefabricated material and 28kg of polyethylene succinate for 13min at the stirring speed of 1300r/min and the stirring temperature of 110 ℃, then heating to 144 ℃, adding 0.75kg of magnesium stearate, 0.75kg of calcium stearate, 1.5kg of zinc diacrylate and 1.5kg of heat stabilizer, continuing stirring for 15min, then heating to 160 ℃, adding 0.7kg of ferric acetylacetonate and 0.8kg of 2-hydroxy-4-methyl acetophenone oxime iron, continuing stirring for 30min, then cooling to room temperature at the speed of 3.5 ℃/min under the stirring state, forming a film by blow molding, wherein the temperature of the film by blow molding is 155 ℃, and obtaining the degradable agricultural mulching film with the thickness of 10 mu m.
Comparative example 2
A preparation method of a degradable agricultural mulching film comprises the following steps:
s1, performing irradiation degradation on 30kg of polylactic acid, wherein the irradiation dose is 0.43MGy, exhausting air and degassing, adding 3kg of sepiolite and 1.5kg of silane coupling agent, grinding to the particle size of 20-40 mu m, adding 4kg of polyvinyl chloride wax, and stirring for 13min at the stirring speed of 4350r/min to obtain a prefabricated material;
s2, stirring 15kg of the prefabricated material for 13min at a stirring speed of 1300r/min at a stirring temperature of 110 ℃, then heating to 144 ℃, then adding 0.75kg of magnesium stearate, 0.75kg of calcium stearate, 1.5kg of zinc diacrylate and 1.5kg of heat stabilizer, continuing stirring for 15min, then heating to 160 ℃, adding 0.7kg of ferric acetylacetonate and 0.8kg of 2-hydroxy-4-methyl acetophenone oxime iron, continuing stirring for 30min, then cooling to room temperature at a speed of 3.5 ℃/min under a stirring state, forming a film by blowing, and obtaining the degradable agricultural mulching film with the thickness of 10 mu m at a film blowing temperature of 155 ℃.
Comparative example 3
A preparation method of a degradable agricultural mulching film comprises the following steps:
s1, mixing 30kg of polylactic acid, 3kg of sepiolite and 1.5kg of silane coupling agent, grinding until the particle size is 20-40 mu m, adding 4kg of polyvinyl chloride wax, and stirring for 13min at the stirring speed of 4350r/min to obtain a prefabricated material;
s2, stirring 15kg of the prefabricated material for 13min at a stirring speed of 1300r/min at a stirring temperature of 110 ℃, then heating to 144 ℃, then adding 0.75kg of magnesium stearate, 0.75kg of calcium stearate, 1.5kg of zinc diacrylate and 1.5kg of heat stabilizer, continuing stirring for 15min, then heating to 160 ℃, adding 0.7kg of ferric acetylacetonate and 0.8kg of 2-hydroxy-4-methyl acetophenone oxime iron, continuing stirring for 30min, then cooling to room temperature at a speed of 3.5 ℃/min under a stirring state, forming a film by blowing, and obtaining the degradable agricultural mulching film with the thickness of 10 mu m at a film blowing temperature of 155 ℃.
Comparative example 4
A preparation method of a degradable agricultural mulching film comprises the following steps: stirring 15kg of polylactic acid for 13min at the stirring speed of 1300r/min at the stirring temperature of 110 ℃, then heating to 144 ℃, then adding 0.75kg of magnesium stearate, 0.75kg of calcium stearate, 1.5kg of zinc diacrylate and 1.5kg of heat stabilizer, continuing stirring for 15min, then heating to 160 ℃, adding 0.7kg of ferric acetylacetonate and 0.8kg of 2-hydroxy-4-methyl acetophenone oxime iron, continuing stirring for 30min, then cooling to room temperature at the stirring speed of 3.5 ℃/min, and performing blow molding to form a film, wherein the temperature of the blow molding film is 155 ℃, so as to obtain the agricultural degradable mulching film with the thickness of 10 mu m.
The comparison experiments of the mulching film for the fruiting period of the crisp pears obtained in the example 5, the degradable agricultural mulching films obtained in the comparative examples 1-4 and the polyvinyl chloride mulching film used in the actual planting process are carried out, the thicknesses of the mulching films are 10 microns, and the comparison experiments are as follows:
1. tensile Property test
And (3) determining the tensile property of the plastic to be tested according to GB/T1040.3-2006 part: type 2 samples were prepared and tested as specified in test conditions for films and sheets, and the results were as follows:
2. tear resistance test
And (3) determining the tearing resistance of the material to be tested according to GB/T16578.1-2008 plastic films and thin sheets, part 1: the results of the measurements specified in the trouser tear method were as follows:
3. impact resistance test
The material to be tested is subjected to a free dart method part 1 according to a GB/T9639.1-2008 plastic film and sheet impact resistance test method: the results of the detection specified in the cascade method "are as follows:
| mass of impact failure, g | |
| Example 5 | 110 |
| Comparative example 1 | 100 |
| Comparative example 2 | 95 |
| Comparative example 3 | 90 |
| Comparative example 4 | 85 |
| Polyvinyl chloride mulching film | 90 |
4. Sealing performance test
Detecting the water vapor permeability of the material to be detected according to the regulation in GB/T1037-88 Plastic film and sheet Water vapor permeability test method cup method, and detecting the gas permeability of the material to be detected according to the regulation in GB/T1038 + 2000 Plastic film and sheet gas permeability test method pressure difference method, wherein the results are as follows:
| water vapor transmission amount, g/m2·d | Gas transmission capacity, L/m2·d·Pa | |
| Example 5 | 592 | 148 |
| Comparative example 1 | 684 | 165 |
| Comparative example 2 | 728 | 174 |
| Comparative example 3 | 793 | 201 |
| Comparative example 4 | 846 | 183 |
| Polyvinyl chloride mulching film | 1000 | 9.2 |
As can be seen from the above experiments 1-4: the tearing resistance and the impact resistance of the mulching film for the fruiting period of the crisp pears are superior to those of polyvinyl chloride mulching films used in the actual agricultural production process, the tensile strength of the mulching film is similar to that of the polyvinyl chloride mulching film, but the elongation at break of the mulching film is lower than that of the polyvinyl chloride mulching film, and the mulching film is suitable for being used in the agricultural production process and is not easy to damage; the water vapor permeability of the mulching film for the fruiting period of the crisp pears is lower than that of a polyvinyl chloride mulching film, and the gas permeability is higher than that of the polyvinyl chloride mulching film.
5. Experiment of degradation Property
And (3) measuring the final aerobic biological decomposition capacity of the material to be measured under GB/T19277.1-2011 controlled composting conditions by adopting a method part 1 for measuring released carbon dioxide: the results of the tests specified in general methods "were as follows:
the above results illustrate that: the mulching film for the fruiting period of the crisp pears meets the requirement of the national degraded plastic standard GB/T20197-2006 (more than or equal to 60%), and meanwhile, the decomposition speed of the mulching film for the fruiting period of the crisp pears is gradually increased along with the lapse of time, namely, the mulching film for the fruiting period of the crisp pears can meet the heat preservation requirement of the early period of the fruiting period, can remarkably reduce the evaporation of soil moisture, stabilize the soil humidity and reduce leaching, loss and volatilization of nutrients; when the crisp pear fruits are ripe, the decomposition speed of the mulching film for the fruiting period of the crisp pear is rapidly increased, the biological decomposition rate reaches 88% when the time reaches 180d, degraded residual substances immediately enter soil, the structure of the soil can be further improved, a loose and porous structure is formed, the porosity and the loose soil structure are rich, the air permeability and the water permeability of the soil are improved, and the oxygen content of the soil is effectively adjusted.
6. Experiment of planting in field
Selecting crisp pear trees in the yellow river estuary sand land of the Dangshan area for testing, laying the material to be tested after blooming in the first 4 th of spring, wherein the test group adopts the mulching film for the crisp pear fruiting period obtained in the example 5, the degradable agricultural mulching film and the polyvinyl chloride mulching film obtained in the comparative examples 1-4 are adopted in comparison with 1-5 groups, and then forest management is carried out according to a conventional planting method until picking begins in the last 9 th of month.
6.1 testing the heat preservation performance: selecting a typical sunny day for 2-3 days at intervals of 30 days within 150 days from the day of laying the material to be measured, and measuring the ground temperature; the hourly readings from 8 to 18 were averaged and the results were as follows:
from the above table, it can be seen that: the mulching film for the fruiting period of crisp pears obtained by the invention is slow in degradation speed in the first 90 days, the heat preservation performance of the mulching film is slightly superior to that of the control group 5, and the heat preservation requirement of the early fruiting period of crisp pears can be met; the soil temperature was gradually close to that of the control group 5 at the later stage with the increase of the degradation degree.
6.2 Water retention Performance test: randomly selecting three points in the fields of the test group and the control group 1-5, and taking a soil sample with a soil layer of 0-20cm for soil water content detection; sampling for 1 time every 30d within 150d from the day of laying the material to be detected, and sampling 1-2 days after the rain stops if the rain continuously rains; the results are as follows:
from the above table, it can be seen that: the mulching film for the fruiting period of the crisp pears obtained by the invention is low in degradation speed in the first 90 days, so that the evaporation of soil moisture is obviously reduced, the soil humidity is stable, and leaching, loss and volatilization of nutrients are reduced; the water content of the soil was gradually close to that of the control group 5 at the later stage with the increase of the degradation degree.
6.3 analysis of the fruits after harvest, the data for each group are as follows:
from the above table, it can be seen that: the mulching film for the fruiting period of the Dangshan pear is laid, and the Dangshan pear planted by the method meets the special standard in NY/T1191 Dangshan pear 2006, which is superior to the prior art.
6.4 sensory evaluation of crisp pears:
sensory evaluation criteria were as follows:
the applicant invites 10 professionals in the Dangshan pear field to form a sensory evaluation group, and comprehensively scores 3 aspects of the color, the taste and the shape of the product, wherein the scoring results are shown in the following table:
| test group | Control 1 group | Control 2 group | Control 3 group | Control 4 group | Control 5 group | |
| Color average score | 20 | 20 | 19 | 18 | 14 | 10 |
| Average flavor score | 23 | 22 | 22 | 21 | 18 | 16 |
| Average taste score | 27 | 25 | 25 | 24 | 22 | 20 |
| Morphology average score | 24 | 23 | 22 | 21 | 17 | 15 |
| Total score | 94 | 90 | 88 | 84 | 71 | 61 |
7. After the Dangshan pear is ripe and harvested, the dormancy period is carried out, meanwhile, the mulching films in the test group and the control 1-5 groups are buried on the spot, the mulching films begin to degrade, and the detection is carried out on the root soil of the Dangshan pear at the end of the dormancy period, specifically as follows:
7.1 detection of microorganisms in soil:
from the above table, it can be seen that: the mulching film obtained by the invention can be buried in the ground for degradation, the degraded residual substances can improve the soil to form a loose porous structure, the air permeability and the water permeability of the soil are improved, the oxygen content in the soil is effectively adjusted, good inhabitation, survival and reproduction places are provided for the survival of microorganisms, energy is provided for the oxidation process of the microorganisms, and the living environment of the microorganisms in the soil is effectively improved.
7.2 volume weight and cation exchange capacity of soil:
from the above table, it can be seen that: the mulching film obtained by the invention can be buried in the ground for degradation, the degraded residual substances can improve the soil to form a loose and porous structure, meanwhile, the surface of the prefabricated material has higher microbial inertia and is difficult to decompose by microorganisms, the cation exchange capacity of the whole soil can be improved, the oxygen-containing functional groups on the surface of the prefabricated material increase the cation exchange performance, the absorption of nutrients is enhanced, and the leaching and loss of soil nutrients are reduced.
7.3 soil organic matter content:
from the above table, it can be seen that: the mulching film obtained by the invention can be buried in the ground for degradation, the degraded residual substances can improve the soil to form a loose porous structure, the air permeability and the water permeability of the soil are improved, the oxygen content in the soil is effectively adjusted, the microbial propagation in the soil is promoted, the soil microbes keep high activity and can promote the decomposition of soil humus, meanwhile, the degradation products can adsorb soil organic molecules, the small molecule organic polymerization is promoted through the surface catalytic activity, the organic matter content in the soil is improved, and the soil fertility is enhanced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (12)
1. A preparation method of a mulching film for a fruiting period of crisp pears is characterized by comprising the following steps:
s1, subjecting polylactic acid to irradiation degradation, exhausting air and degassing, adding sepiolite and a silane coupling agent, grinding, adding polyvinyl chloride wax, and stirring to obtain a prefabricated material;
and S2, stirring the prefabricated material and the polyethylene succinate, heating, adding the plasticizer, the cross-linking agent and the heat stabilizer, continuously stirring, heating, adding the photoinitiator and the filler, continuously stirring, cooling to room temperature in a stirring state, and performing blow molding to form the mulching film for the fruiting period of the crisp pears.
2. The method for preparing the mulching film for the fruiting period of the crisp pears as claimed in claim 1, wherein the irradiation dose in the irradiation degradation process of the polylactic acid S1 is 0.40-0.46 MGy.
3. The method for preparing the mulching film for the pear fruiting period according to claim 1 or 2, wherein in S1, the grinding is carried out until the grain size is 20-40 μm.
4. The method for preparing the mulching film for the fruiting period of the crisp pears as claimed in claim 1, wherein in S1, the weight ratio of polylactic acid, sepiolite, silane coupling agent and polyvinyl chloride wax is 20-40: 1-5: 1-2: 3-5.
5. The method for preparing the mulching film for the pear fruiting period as claimed in claim 1, wherein in S2, the stirring time of the prefabricated material and the polyethylene succinate is 10-16min, the stirring speed is 1200-1400r/min, and the stirring temperature is 100-120 ℃.
6. The method for preparing the mulching film for the pear fruiting period as claimed in claim 1, wherein in S2, the temperature is raised to 140-148 ℃, the plasticizer, the cross-linking agent and the heat stabilizer are added and stirred for 10-20min, the temperature is raised to 155-164 ℃, the photoinitiator and the filler are added and stirred for 20-40 min.
7. The method for preparing the mulching film for the pear fruiting period as claimed in claim 1, wherein in S2, the stirring state is decreased to room temperature, and the temperature decrease speed is 2-5 ℃/min.
8. The method for preparing the mulching film for the fruiting period of crisp pears as claimed in claim 1, wherein in S2, the weight ratio of the prefabricated material, the polyethylene succinate, the plasticizer, the cross-linking agent, the heat stabilizer, the photoinitiator and the filler is 10-20: 22-35: 1-2: 1-2: 1-2: 1-2: 8-20.
9. The method for preparing the mulching film for the fruiting period of crisp pears as claimed in claim 1, wherein in S2, the photoinitiator is at least one of ferric acetylacetonate, ferric 2-hydroxy-4-methyl acetophenone oxime and ferric stearate.
10. The method for preparing the mulching film for the pear fruiting period according to claim 1, wherein in S2, the plasticizer is magnesium stearate and/or calcium stearate.
11. The method for preparing a mulching film for the fruiting period of crisp pears as claimed in claim 1, wherein in S2, the filler is at least one of diatomite, medical stone powder and zeolite powder.
12. The method for preparing the mulching film for the fruiting period of the crisp pears as claimed in claim 1, wherein in S2, the cross-linking agent is zinc diacrylate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810927762.4A CN109135230B (en) | 2018-08-15 | 2018-08-15 | Preparation method of mulching film for fruiting period of crisp pears |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810927762.4A CN109135230B (en) | 2018-08-15 | 2018-08-15 | Preparation method of mulching film for fruiting period of crisp pears |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109135230A CN109135230A (en) | 2019-01-04 |
| CN109135230B true CN109135230B (en) | 2020-10-23 |
Family
ID=64789480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810927762.4A Active CN109135230B (en) | 2018-08-15 | 2018-08-15 | Preparation method of mulching film for fruiting period of crisp pears |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109135230B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115710379B (en) * | 2022-11-22 | 2023-09-15 | 北京联飞翔科技股份有限公司 | Inorganic nonmetallic mineral composite drip-stopping agent and its preparation and application |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429294A (en) * | 2008-05-29 | 2009-05-13 | 孙彦升 | Full-biodegradation plastic starch master batch, preparation and uses thereof |
| CN101824229A (en) * | 2009-03-06 | 2010-09-08 | 西南科技大学 | Thermoplastic plant fiber/polylactic acid blending material and preparation method thereof |
| CN107033568A (en) * | 2017-05-18 | 2017-08-11 | 中国科学院长春应用化学研究所 | A kind of Biodegradable material and biodegradable mulch film |
-
2018
- 2018-08-15 CN CN201810927762.4A patent/CN109135230B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429294A (en) * | 2008-05-29 | 2009-05-13 | 孙彦升 | Full-biodegradation plastic starch master batch, preparation and uses thereof |
| CN101824229A (en) * | 2009-03-06 | 2010-09-08 | 西南科技大学 | Thermoplastic plant fiber/polylactic acid blending material and preparation method thereof |
| CN107033568A (en) * | 2017-05-18 | 2017-08-11 | 中国科学院长春应用化学研究所 | A kind of Biodegradable material and biodegradable mulch film |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109135230A (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Bellettini et al. | Factors affecting mushroom Pleurotus spp. | |
| CN107371447B (en) | A kind of method of gardens organic mat improvement soil | |
| CN103920391B (en) | A kind of collecting carbonic anhydride agent and preparation method thereof | |
| CN109160859B (en) | Method for producing bio-organic fertilizer by treating livestock and poultry excrement waste through earthworms | |
| CN105368456B (en) | A kind of secondary salinization of land modifying agent and its preparation process | |
| CN106882994A (en) | A kind of implantation methods of the tuber of pinellia | |
| CN109354556A (en) | A kind of composite conditioner and the preparation method and application thereof for improveing alkaline land soil | |
| CN106416886A (en) | Method for producing selenium-rich yellow peaches | |
| CN109135230B (en) | Preparation method of mulching film for fruiting period of crisp pears | |
| CN114773113A (en) | Mushroom stick organic selenium biological fertilizer and preparation method thereof | |
| Tajeddin et al. | The effect of modified atmosphere packaging on the shelf-life of greenhouse-grown tomato | |
| CN109757302B (en) | Disease-resistant mushroom culture medium and preparation method thereof | |
| CN103951483A (en) | Biological antibacterial fertilizer for preventing and controlling soil-borne diseases of crops as well as production process and application of biological antibacterial fertilizer | |
| El Hage et al. | Harvest and postharvest technologies | |
| CN114410308A (en) | Neutral soil conditioner prepared from decomposed organic materials and application thereof | |
| CN114946600A (en) | Vegetable seedling raising substrate and preparation method thereof | |
| CN105779334B (en) | A kind of bacillus WDGJ11 and its application on raising quality of tobacco | |
| CN112194536B (en) | Soil improvement material component for improving vegetable biomass | |
| CN104222075A (en) | Temperature-sensitive trichoderma harzianum microbial agent carrier formula and preparation process thereof | |
| CN112703966A (en) | Method for efficiently cultivating oospore oudemansiella mucida by using water-retaining material | |
| CN103333805B (en) | The expanding propagation method of a kind of China fir forest land advantage endogenous growth model | |
| CN107652026B (en) | Special disease-resistant fertilizer for fingered citron and Chinese yam and preparation method thereof | |
| CN113233935A (en) | Composite microbial fertilizer and preparation method and application thereof | |
| CN108307720B (en) | Method for multiple covering of soil surface | |
| CN111197009A (en) | Culture medium for promoting Esteya vermicola growth and spore production and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20200924 Address after: Room 1, South, No.15, Lane 6, xinandong, Shuxi street, Wuyi County, Jinhua City, Zhejiang Province (self declaration) Applicant after: Wuyi Penglai Trading Co.,Ltd. Address before: 230000 Room 3301, Unit 1, 2 Buildings, Unit 1, No. 7 Science Avenue, Hefei High-tech Zone, Anhui Province Applicant before: HEFEI BIGENGYING TECHNOLOGY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221222 Address after: 277700 room 3, incubator, No. 3, science and Technology City, economic development zone, Lanling County, Linyi City, Shandong Province Patentee after: Shandong kupin Intelligent Technology Co.,Ltd. Address before: 321200 room 1, South, No.15, Lane 6, xinandong, Shuxi street, Wuyi County, Jinhua City, Zhejiang Province (self declaration) Patentee before: Wuyi Penglai Trading Co.,Ltd. |