CN109023571B - Composite fiber and application thereof in rice insect-proof net - Google Patents
Composite fiber and application thereof in rice insect-proof net Download PDFInfo
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- CN109023571B CN109023571B CN201810935773.7A CN201810935773A CN109023571B CN 109023571 B CN109023571 B CN 109023571B CN 201810935773 A CN201810935773 A CN 201810935773A CN 109023571 B CN109023571 B CN 109023571B
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
- D01F1/103—Agents inhibiting growth of microorganisms
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- 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
- A01G13/00—Protecting plants
- A01G13/10—Devices for affording protection against animals, birds or other pests
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M29/00—Scaring or repelling devices, e.g. bird-scaring apparatus
- A01M29/30—Scaring or repelling devices, e.g. bird-scaring apparatus preventing or obstructing access or passage, e.g. by means of barriers, spikes, cords, obstacles or sprinkled water
- A01M29/34—Scaring or repelling devices, e.g. bird-scaring apparatus preventing or obstructing access or passage, e.g. by means of barriers, spikes, cords, obstacles or sprinkled water specially adapted for insects
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/92—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of polyesters
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/94—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of other polycondensation products
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Abstract
The invention discloses a composite fiber and application thereof, wherein the composite fiber comprises a fiber base material and chitosan particles with the particle size of 1-5 mu m; the weight percentage of the chitosan particles in the composite fiber is 1-10 wt%; the chitosan particles consist of chitosan, copper stearate and europium ions in a mass ratio of 1-2:0.1-0.5: 0.02-0.05. The insect-proof net has a good effect of blocking insects, the rice planthopper prevention effect of the insect-proof net can be ensured for a long time by adding the milk granules for preventing the rice planthopper into the fibers, and the red spectrum reinforcing agent can well promote the growth of rice.
Description
Technical Field
The invention relates to a fiber and application thereof, in particular to an insect-proof fiber and application thereof in a rice insect-proof net.
Background
The rice is cultivated by isolating the insect-proof net, so that the rice planthopper is effectively prevented from invading the seedling bed to transmit toxicity, and the pesticide is not needed to be used for preventing and controlling during isolation, thereby reducing the pollution of chemical pesticide to the environment. Is an effective way for preventing rice diseases and insect pests. The application research of the insect-proof net in the rice production indicates that the insect-proof effect of the insect-proof net on the Laodelphax striatellus is overlapped by 99 percent, and the plant height and tillering number of seedlings are obviously improved. However, the insect net cannot completely eradicate main pests of rice such as laodelphax striatellus and laodelphax striatellus.
In addition, researches show that red light is preferred in the growth process of rice, for example, the influence of different spectra and composite spectra on rice production is researched in 'the influence of different spectral energy distributions on the growth of rice seedlings', the current rice insect-proof net is usually a white insect-proof net, and the red spectrum penetrating through the insect-proof net cannot be enhanced by the white insect-proof net. For example, in the case of using rare earth elements to prepare a red-enhanced mirror, for example, chinese patent 2017104871880 provides a hydrogel which is prepared by using rare earth europium ions and can emit red fluorescence, but when the method is applied to fibers by directly decocting rare earth europium ions and modified chitosan, the rare earth ions are easily distributed unevenly, and the use effect is affected.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a composite fiber for an insect-proof net. The invention also provides the application of the composite fiber in the rice insect-proof net.
The technical scheme is as follows: the composite fiber comprises a fiber base material and chitosan particles with the particle size of 1-5 mu m; the weight percentage of the chitosan particles in the composite fiber is 1-10 wt%; the chitosan particles consist of chitosan, copper stearate and europium ions in a mass ratio of 1-2:0.1-0.5: 0.02-0.05.
Preferably, the composite fiber contains 0.1-5 wt% of the emulsion for controlling rice planthopper.
Preferably, the particle size of the emulsion granules is 200-300 nm.
Preferably, the composite fiber comprises 0.1-0.5 wt% of pigment particles, preferably red pigment particles, in particular pigment red 104.
Preferably, the fiber matrix is polyethylene fiber, polylactic acid fiber or polyurethane fiber.
To further explain the composition of the present invention, a chitosan microparticle preparation method can be disclosed as follows:
(1) dissolving chitosan, copper stearate and europium chloride in an acetic acid solution, wherein the mass ratio of the chitosan to the copper stearate to the europium ion is 1-2:0.1-0.5: 0.02-0.05;
(2) dropwise adding a dilute alkali solution into the mixed solution obtained in the step (1) to enable the pH of the solution to be 6.0-8.0;
(3) and (3) concentrating and freeze-drying the solution obtained in the step (2) to obtain chitosan particles, thus obtaining the chitosan particles.
Preferably, the emulsion agent contains 1-30% thiamethoxam.
The emulsion agent can be prepared by any one of the prior art, and specifically, the following preparation methods can be adopted:
the method comprises the following steps: preparation of a Stable O/W emulsion: adding a styrene maleic anhydride copolymer into water, stirring and dispersing at the rotating speed of 5000-;
step two: adding ethyl cellulose into the formed O/W emulsion, adjusting the pH value of the solution to 3-5, polymerizing for 36-48h at the temperature of 60-70 ℃, and curing;
step three: and freeze-drying the solidified solution to obtain the emulsion granules containing thiamethoxam.
The preparation method of the composite fiber can be as follows: an electrospinning process or a melt blowing process.
The electrostatic spinning method comprises the following steps: preparing a 10 wt% polyethylene fiber/polyurethane/polylactic acid solution by using a mixed solvent of N, N-dimethylformamide and tetrahydrofuran/chloroform in a volume ratio of 50:50, adding chitosan particles/milk granules/pigment particles prepared in the invention into the solution, stirring, mixing uniformly, then adding the solution into a syringe and electrospinning.
The melt-blown spinning method comprises the following steps: the raw material components of the composite fiber are added into a melt-blowing machine for melt-blowing, the diameter of the final composite fiber can be determined according to a nozzle, and the composite fibers with different diameters can be prepared.
The composite fiber is applied to the rice insect-proof net.
Considering the shading rate, the ventilation rate and the obstruction of physical action to plant diseases and insect pests of the insect-proof net comprehensively, the length of the rectangular aperture of the rice insect-proof net is preferably 0.29-0.95mm, and the width of the rectangular aperture is preferably 0.29-0.95 mm.
Preferably, the shading rate of the rice insect-proof net is 20-40%; the ventilation rate of the rice insect-proof net is 30-60%.
The main pests in the rice are rice planthoppers which comprise brown planthoppers, gray planthoppers and white planthoppers, the body sizes of long-wing adults are 3.5-5 mm, and the body sizes of short-wing adults are 2-4 mm, the rice planthoppers can be well controlled by the insect-proof net, but in order to prevent overwintering larvae and other rice planthopper larvae, the rice planthopper prevention slow-release granules are added into the insect-proof net, so that the control effect on the rice planthoppers is further improved.
The invention comprehensively considers the specification of the insect-proof net suitable for the rice, forms a microclimate suitable for the growth of the rice in the net cover of the insect-proof net, has proper temperature, humidity and air permeability, and gives more red spectrum to the rice than under other white and transparent insect-proof nets, so that the rice can grow quickly.
In the present invention, "%" is a mass percentage unless otherwise specified.
Has the advantages that: (1) according to the invention, europium ions are added into the fibers, so that the intensity of red spectrum passing through the insect-proof net is improved, and the rice yield is improved; (2) according to the invention, the milk granules for preventing and controlling rice planthoppers are added in the fiber, so that the insect prevention effect of the insect prevention net is improved; (3) the insect-proof net has the functions of preventing insects and shading sun, and simultaneously enhances the influence of red spectrum in sunlight on the photosynthesis of rice, so that the rice can grow rapidly.
Detailed Description
Firstly, preparation of raw materials
1.1 preparation of Chitosan microparticles
Sample 1:
the method comprises the following steps: dissolving chitosan with average molecular weight of 20000KDa in 1mol/L acetic acid solution, adding copper stearate and europium chloride, and dissolving, wherein the mass ratio of chitosan, copper stearate and europium ion is 1:0.1: 0.02.
Step two: 0.1mol/L sodium hydroxide solution is added dropwise to the mixed solution so that the pH of the solution is 6.0-8.0.
Step three: and concentrating and freeze-drying the obtained solution to obtain chitosan particles.
Sample 2:
the method comprises the following steps: dissolving chitosan with the average molecular weight of 20000KDa in 1mol/L acetic acid solution, adding copper stearate and europium chloride for dissolution, wherein the mass ratio of the chitosan to the copper stearate to the europium ions is 2:0.5: 0.05.
Step two: 0.1mol/L sodium hydroxide solution is added dropwise to the mixed solution so that the pH of the solution is 6.0-8.0.
Step three: and concentrating and freeze-drying the obtained solution to obtain chitosan particles.
Sample 3:
the method comprises the following steps: dissolving chitosan with the average molecular weight of 20000KDa in 1mol/L acetic acid solution, adding copper stearate and europium chloride for dissolution, wherein the mass ratio of the chitosan to the copper stearate to the europium ions is 1.5:0.2: 0.03.
Step two: 0.1mol/L sodium hydroxide solution is added dropwise to the mixed solution so that the pH of the solution is 6.0-8.0.
Step three: and concentrating and freeze-drying the obtained solution to obtain chitosan particles.
Comparative sample 1:
the method comprises the following steps: dissolving chitosan with the average molecular weight of 20000KDa in 1mol/L acetic acid solution, adding europium chloride for dissolution, wherein the mass ratio of the chitosan to europium ions is 1.5: 0.03.
Step two: 0.1mol/L sodium hydroxide solution is added dropwise to the mixed solution so that the pH of the solution is 6.0-8.0.
Step three: and concentrating and freeze-drying the obtained solution to obtain chitosan particles.
Comparative sample 2:
the method comprises the following steps: dissolving chitosan with the average molecular weight of 20000KDa in 1mol/L acetic acid solution, adding copper stearate for dissolution, wherein the mass ratio of the chitosan to europium ions is 1.5: 0.2.
Step two: 0.1mol/L sodium hydroxide solution is added dropwise to the mixed solution so that the pH of the solution is 6.0-8.0.
Step three: and concentrating and freeze-drying the obtained solution to obtain chitosan particles.
1.2 preparation of emulsion granules
Sample 4:
the method comprises the following steps: preparation of a Stable O/W emulsion: adding a styrene maleic anhydride copolymer into water to prepare a mixed solution with the styrene maleic anhydride copolymer mass percent of 10%, stirring and dispersing at 6000rmp, adding thiamethoxam, and emulsifying at a shear rate of 8000rmp for 40min to obtain a stable O/W emulsion;
step two: adding ethyl cellulose with the same mass as the styrene maleic anhydride copolymer into the formed O/W emulsion, adjusting the pH of the solution to 3-5, polymerizing for 36-48h at the temperature of 60-70 ℃, and curing;
step three: and freeze-drying the solidified solution to obtain thiamethoxam emulsion granules containing 20% of active ingredients.
Second, sample preparation
Example 1: preparing 10 wt% of polyurethane solution by using a mixed solvent of N, N-dimethylformamide and chloroform in a volume ratio of 50:50, adding the prepared chitosan particles of the sample 1 and the emulsion granules of the sample 4 prepared in part 1.2 into the polyurethane solution, stirring, uniformly mixing, adding the solution into an injector, and carrying out electrostatic spinning to obtain the composite fiber, wherein the weight percentage of the chitosan particles in the composite fiber is 1 wt%, and the weight percentage of the emulsion granules in the composite fiber is 0.1 wt%.
Example 2: preparing 10 wt% of polyurethane solution by using a mixed solvent of N, N-dimethylformamide and chloroform in a volume ratio of 50:50, adding the prepared chitosan particles of the sample 2 and the emulsion granules of the sample 4 prepared in part 1.2 into the polyurethane solution, stirring, uniformly mixing, adding the solution into an injector, and carrying out electrostatic spinning to obtain the composite fiber, wherein the weight percentage of the chitosan particles in the composite fiber is 5 wt%, and the weight percentage of the emulsion granules in the composite fiber is 3 wt%.
Example 3: preparing 10 wt% of polyurethane solution by using a mixed solvent of N, N-dimethylformamide and chloroform in a volume ratio of 50:50, adding the prepared chitosan particles of the sample 3 and the emulsion granules of the sample 4 prepared in part 1.2 into the polyurethane solution, stirring, uniformly mixing, adding the solution into an injector, and carrying out electrostatic spinning to obtain the composite fiber, wherein the weight percentage of the chitosan particles in the composite fiber is 10 wt%, and the weight percentage of the emulsion granules in the composite fiber is 5 wt%.
Example 4: the weight percent of chitosan particles in sample 2 in the composite fiber was 5 wt%, the weight percent of the emulsion agent in the composite fiber was 3 wt%, and the weight percent of pigment particle pigment Red 104 in the composite fiber was 0.1 wt%, as in example 2, except that the above.
Example 5: the weight percent of chitosan particles in sample 2 in the composite fiber was 5 wt%, the weight percent of the emulsion agent in the composite fiber was 3 wt%, and the weight percent of pigment particle pigment Red 104 in the composite fiber was 0.3 wt%, as in example 2, for the rest.
Example 6: the weight percent of chitosan particles in sample 2 in the composite fiber was 5 wt%, the weight percent of the emulsion agent in the composite fiber was 3 wt%, and the weight percent of pigment particle pigment Red 104 in the composite fiber was 0.5 wt%, as in example 2, for the rest.
Comparative example 1: the weight percentage of chitosan particles in sample 2 in the composite fiber was 5 wt%, as in example 2.
Comparative example 2: the weight percentage of the emulsion agent in the composite fiber was 3 wt%, and the rest was the same as in example 2.
Comparative example 3: the chitosan fine particles of comparative sample 1 in the composite fiber were 5 wt%, and the emulsifying agent in the composite fiber was 3 wt%.
Comparative example 4: the chitosan fine particles of comparative sample 2 in the composite fiber were 5 wt%, and the emulsifying agent in the composite fiber was 3 wt%.
Third, sample treatment
3.1 sample Water washing
The composite fiber prepared in example 2 is used for preparing an insect-proof net I, the composite fiber prepared in comparative example 3 is used for preparing an insect-proof net II, the composite fiber prepared in comparative example 4 is used for preparing an insect-proof net III, the aperture of the insect-proof net is a rectangular aperture, the length of the rectangular aperture is 0.6mm, and the width of the rectangular aperture is 0.4 mm.
And (3) water washing: and (3) putting the prepared insect-proof net into water, performing ultrasonic treatment for 2 seconds at the frequency of 25KHZ, stopping the ultrasonic treatment for 3 seconds to serve as an ultrasonic circulation, performing water washing on the prepared insect-proof net for 50 cycles, and airing the washed insect-proof net for later use.
And (3.2) performing indoor tests on the insect-proof nets before and after water washing respectively, and treating the hole trays without the insect-proof nets as blanks.
3.2 laboratory test
The method comprises the steps of performing indoor tests on samples subjected to 3.1 part treatment, selecting rice seedlings with the plant height of 5-6cm by using an illumination incubator as an instrument, providing a seedling raising matrix for rice seedling raising by Huaian Chaihei agriculture science and technology development limited company, culturing the rice seedlings in the illumination incubator under the same culture conditions, covering different insect-proof nets on different seedling trays, performing three groups of parallel tests, and investigating the growth conditions of the rice seedlings before and after the tests. The culture conditions were: the temperature in illumination is 28 +/-2) DEG C, the night temperature is 20+2 ℃, the relative humidity is 85%, the light-dark time is 12h/12h, the illumination time is 10d totally, the 15 th day after sowing is measured, and 30 rice samples in the same treatment are respectively selected randomly to measure the form and the index.
3.3 laboratory test results
The measurement results are shown in table 1.
TABLE 1 Effect of different insect nets on Rice growth Performance
| Different treatment | Plant height/cm | Diameter/mm | Chlorophyll content/mg g-1 |
| Washing treated insect-proof net I | 22.2 | 3.11 | 2.61 |
| Washing treated insect-proof net No. two | 18.7 | 2.90 | 2.01 |
| Washing treated insect-proof net No. three | 16.1 | 2.75 | 1.99 |
| Insect-proof net No. I without water washing treatment | 22.7 | 3.15 | 2.63 |
| No. two insect-proof nets without water washing treatment | 19.3 | 3.05 | 2.39 |
| No. three insect-proof net without water washing treatment | 16.6 | 2.87 | 1.96 |
| Blank processing | 17.8 | 2.74 | 1.95 |
The basic components of the insect-proof net in the test are the same, but chitosan particles of the sample 2 are added into the insect-proof net I, wherein copper stearate can increase the complexing ability of europium chloride and chitosan, and the influence of the insect-proof net after ultrasonic washing and the insect-proof net without washing on the growth ability of rice is not large, so that the insect-proof net can be used outdoors for a long time, and active ingredients in the insect-proof net can resist rain erosion.
The insect-proof net II is prepared by the composite fiber of the comparative example 3, when europium chloride in chitosan particles in the composite fiber of the comparative example 3 is mixed with the chitosan particles, copper stearate is not added, and the difference between the growth influence of the europium chloride without the copper stearate on rice before and after water washing is large as can be seen from the indoor test result, which shows that the copper stearate can increase the tight combination of the europium chloride and the chitosan, and in addition, the effect of europium ions on the red spectrum can be increased by comparing the result of the insect-proof net II before water washing with the result of the insect-proof net I without water washing.
Copper stearate is only added into the composite fiber in the insect-proof net III, so that the transmittance of a red spectrum is not obviously increased before and after water washing, and the growth of plants is not obviously increased.
Fourth, testing application effect
4.1 field test method
The test is carried out in the Huachang agricultural base in 2016, the rice variety is Chang Jing No. 12, the rice is sowed in 5 days in 6 months, the rice is transplanted in 25 days in 6 months, and the growth condition of the rice is investigated after the rice is transplanted for 60 days. Each planting plot area was 5.0m × 3.0m, each plot covered the insect net made of the composite fibers of examples 1-6 and comparative examples 1-2 prepared in the second section, each treatment was set to 3 parallel, the aperture of the insect net was a rectangular aperture, the length of the rectangular aperture was 0.7mm, and the width of the rectangular aperture was 0.5mm, and the plot not covered with the insect net was used as a blank control.
TABLE 2 influence of different insect nets on the growth of rice field
| Treatment of | Insect repelling rate/%) | Rice planthopper incidence/%) | Plant height/cm | Diameter/mm |
| Example 1 | 99.0 | 0 | 61.4 | 3.3 |
| Example 2 | 98.5 | 0 | 62.1 | 3.3 |
| Example 3 | 99.1 | 0 | 65.2 | 3.8 |
| Example 4 | 98.5 | 0 | 63.0 | 3.6 |
| Example 5 | 99.3 | 0 | 62.8 | 3.5 |
| Example 6 | 98.2 | 0 | 64.5 | 3.6 |
| Comparative example 1 | 98.1 | 0.85 | 61.1 | 3.2 |
| Comparative example 2 | 97.9 | 0 | 60.3 | 3.2 |
| Blank control | 0 | 4.5 | 58.4 | 3.1 |
As can be seen from the results in Table 2, the insect net of the present invention has a good insect-blocking effect, and the addition of the milk granules for preventing rice planthoppers to the fibers can ensure the prevention effect of the insect net against rice planthoppers for a long time, and in addition, the red spectrum enhancer of the present invention can promote the growth of rice well.
Claims (3)
1. A rice insect-proof net prepared from composite fibers is characterized in that the composite fibers are prepared by the following method:
preparing 10 wt% of polyurethane solution by using a mixed solvent of N, N-dimethylformamide and chloroform in a volume ratio of 50:50, adding chitosan particles and emulsion granules into the polyurethane solution, stirring, uniformly mixing, adding the solution into an injector, and performing electrostatic spinning to obtain composite fibers, wherein the weight percentage of the chitosan particles in the composite fibers is 5 wt%, and the weight percentage of the emulsion granules in the composite fibers is 3 wt%;
preparing chitosan particles:
step (11): dissolving chitosan with the average molecular weight of 20000KDa in 1mol/L acetic acid solution, adding copper stearate and europium chloride for dissolution, wherein the mass ratio of the chitosan to the copper stearate to the europium ions is 2:0.5: 0.05;
step (12): dropwise adding 0.1mol/L sodium hydroxide solution into the mixed solution to ensure that the pH of the solution is 6.0-8.0;
step (13): concentrating the obtained solution, and freeze-drying to obtain chitosan particles;
preparation of the emulsion agent:
step (21): preparation of a Stable O/W emulsion: adding a styrene maleic anhydride copolymer into water to prepare a mixed solution with the styrene maleic anhydride copolymer mass percent of 10%, stirring and dispersing at 6000rmp, adding thiamethoxam, and emulsifying at a shear rate of 8000rmp for 40min to obtain a stable O/W emulsion;
step (22): adding ethyl cellulose with the same mass as the styrene maleic anhydride copolymer into the formed O/W emulsion, adjusting the pH of the solution to 3-5, polymerizing for 36-48h at the temperature of 60-70 ℃, and curing;
step (23): and freeze-drying the solidified solution to obtain thiamethoxam emulsion granules containing 20% of active ingredients.
2. The rice insect net prepared from the composite fibers according to claim 1, wherein the rice insect net has a rectangular aperture with a length of 0.29-0.95mm and a rectangular aperture with a width of 0.29-0.95 mm.
3. The rice insect net prepared from the composite fibers according to claim 2, wherein the light shading rate of the rice insect net is 20-40%; the ventilation rate of the rice insect-proof net is 30-60%.
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| CN106574176A (en) * | 2014-08-04 | 2017-04-19 | 罗地亚经营管理公司 | Modified phosphors and compositions thereof |
| CN104674363A (en) * | 2015-01-28 | 2015-06-03 | 南通华纶化纤有限公司 | Organic rare earth europium luminescent polypropylene (PP) fiber and preparation method thereof |
| CN107312536A (en) * | 2017-06-23 | 2017-11-03 | 云南师范大学 | A kind of emitting red light rare earth composite material, preparation method and application |
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