CN114145315A - Pyrethrum extract emulsion in water and preparation method thereof - Google Patents
Pyrethrum extract emulsion in water and preparation method thereof Download PDFInfo
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- CN114145315A CN114145315A CN202111640500.8A CN202111640500A CN114145315A CN 114145315 A CN114145315 A CN 114145315A CN 202111640500 A CN202111640500 A CN 202111640500A CN 114145315 A CN114145315 A CN 114145315A
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- 229940048383 pyrethrum extract Drugs 0.000 title claims abstract description 77
- 239000000839 emulsion Substances 0.000 title claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 16
- 239000003755 preservative agent Substances 0.000 claims abstract description 15
- 230000002335 preservative effect Effects 0.000 claims abstract description 15
- 238000009736 wetting Methods 0.000 claims abstract description 15
- 239000002562 thickening agent Substances 0.000 claims abstract description 13
- 239000008367 deionised water Substances 0.000 claims abstract description 11
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 18
- 239000003945 anionic surfactant Substances 0.000 claims description 11
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 8
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 8
- 238000000354 decomposition reaction Methods 0.000 claims description 8
- 239000002736 nonionic surfactant Substances 0.000 claims description 8
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 8
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 8
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 8
- 239000008158 vegetable oil Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 7
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical group CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 6
- DMSMPAJRVJJAGA-UHFFFAOYSA-N benzo[d]isothiazol-3-one Chemical group C1=CC=C2C(=O)NSC2=C1 DMSMPAJRVJJAGA-UHFFFAOYSA-N 0.000 claims description 6
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 6
- 239000000230 xanthan gum Substances 0.000 claims description 6
- 229920001285 xanthan gum Polymers 0.000 claims description 6
- 229940082509 xanthan gum Drugs 0.000 claims description 6
- 235000010493 xanthan gum Nutrition 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- UDSFAEKRVUSQDD-UHFFFAOYSA-N Dimethyl adipate Chemical compound COC(=O)CCCCC(=O)OC UDSFAEKRVUSQDD-UHFFFAOYSA-N 0.000 claims description 3
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 3
- XTDYIOOONNVFMA-UHFFFAOYSA-N dimethyl pentanedioate Chemical compound COC(=O)CCCC(=O)OC XTDYIOOONNVFMA-UHFFFAOYSA-N 0.000 claims description 3
- 229940044949 eucalyptus oil Drugs 0.000 claims description 3
- 239000010642 eucalyptus oil Substances 0.000 claims description 3
- 239000000194 fatty acid Substances 0.000 claims description 3
- 229930195729 fatty acid Natural products 0.000 claims description 3
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- 150000001991 dicarboxylic acids Chemical class 0.000 claims 1
- 150000002148 esters Chemical class 0.000 claims 1
- 239000003112 inhibitor Substances 0.000 claims 1
- 230000000749 insecticidal effect Effects 0.000 abstract description 11
- 241000196324 Embryophyta Species 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000006303 photolysis reaction Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 5
- 235000019198 oils Nutrition 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 241000282414 Homo sapiens Species 0.000 description 3
- 241001465754 Metazoa Species 0.000 description 3
- 241000607479 Yersinia pestis Species 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000575 pesticide Substances 0.000 description 3
- IBFYXTRXDNAPMM-BVTMAQQCSA-N Geniposide Chemical compound O([C@@H]1OC=C([C@@H]2[C@H]1C(=CC2)CO)C(=O)OC)[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O IBFYXTRXDNAPMM-BVTMAQQCSA-N 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 2
- VQXSOUPNOZTNAI-UHFFFAOYSA-N Pyrethrin I Natural products CC(=CC1CC1C(=O)OC2CC(=O)C(=C2C)CC=C/C=C)C VQXSOUPNOZTNAI-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- VJFUPGQZSXIULQ-XIGJTORUSA-N pyrethrin II Chemical compound CC1(C)[C@H](/C=C(\C)C(=O)OC)[C@H]1C(=O)O[C@@H]1C(C)=C(C\C=C/C=C)C(=O)C1 VJFUPGQZSXIULQ-XIGJTORUSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 241000208838 Asteraceae Species 0.000 description 1
- 206010059866 Drug resistance Diseases 0.000 description 1
- VMORCWYWLVLMDG-YZGWKJHDSA-N Pyrethrin-II Natural products CC(=O)OC(=C[C@@H]1[C@H](C(=O)O[C@H]2CC(=O)C(=C2C)CC=CC=C)C1(C)C)C VMORCWYWLVLMDG-YZGWKJHDSA-N 0.000 description 1
- 240000004460 Tanacetum coccineum Species 0.000 description 1
- ROVGZAWFACYCSP-MQBLHHJJSA-N [2-methyl-4-oxo-3-[(2z)-penta-2,4-dienyl]cyclopent-2-en-1-yl] (1r,3r)-2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropane-1-carboxylate Chemical compound CC1(C)[C@H](C=C(C)C)[C@H]1C(=O)OC1C(C)=C(C\C=C/C=C)C(=O)C1 ROVGZAWFACYCSP-MQBLHHJJSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007705 chemical test Methods 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002917 insecticide Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004811 liquid chromatography Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 230000000361 pesticidal effect Effects 0.000 description 1
- 239000000447 pesticide residue Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- HYJYGLGUBUDSLJ-UHFFFAOYSA-N pyrethrin Natural products CCC(=O)OC1CC(=C)C2CC3OC3(C)C2C2OC(=O)C(=C)C12 HYJYGLGUBUDSLJ-UHFFFAOYSA-N 0.000 description 1
- ROVGZAWFACYCSP-VUMXUWRFSA-N pyrethrin I Chemical compound CC1(C)[C@H](C=C(C)C)[C@H]1C(=O)O[C@@H]1C(C)=C(C\C=C/C=C)C(=O)C1 ROVGZAWFACYCSP-VUMXUWRFSA-N 0.000 description 1
- 229940015367 pyrethrum Drugs 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
- A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/22—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing ingredients stabilising the active ingredients
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
- A01N65/08—Magnoliopsida [dicotyledons]
- A01N65/12—Asteraceae or Compositae [Aster or Sunflower family], e.g. daisy, pyrethrum, artichoke, lettuce, sunflower, wormwood or tarragon
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Plant Pathology (AREA)
- Environmental Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Dentistry (AREA)
- Mycology (AREA)
- Microbiology (AREA)
- Natural Medicines & Medicinal Plants (AREA)
- Biotechnology (AREA)
- Pest Control & Pesticides (AREA)
- Toxicology (AREA)
- Botany (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention belongs to the field of emulsion in water, and particularly relates to a pyrethrum extract emulsion in water and a preparation method thereof, wherein the pyrethrum extract emulsion in water comprises the following components in parts by mass: 1.0-10.0% of pyrethrum extract, 1-30% of solvent, 2-20% of wetting dispersant, 0.1-0.5% of preservative, 0.1-1% of thickening agent, 0.1-2% of light-proof decomposer and the balance of deionized water, wherein the sum of the mass fractions of the components is 100%; the pyrethrum extract aqueous emulsion is environment-friendly and efficient, solves the problems that the pyrethrum extract aqueous emulsion is unstable and the pyrethrum extract loses insecticidal property by photodecomposition, and is low in manufacturing cost and safe and environment-friendly to plants.
Description
Technical Field
The invention relates to the field of emulsion in water, and in particular relates to a pyrethrum extract emulsion in water and a preparation method thereof.
Background
Chemical pesticides and chemical fertilizers are applied in agricultural production in China for a long time, so that a large amount of pesticide residues are caused, soil, natural water and agricultural products are polluted, and human health is harmed. The pyrethrum extract is an active ingredient with insecticidal effect, which is separated and extracted from inflorescence of pyrethrum album of Compositae, which is dicotyledonous plant, also called natural pyrethrin, and comprises pyrethrin I, pyrethrin II, guajulin I, guajulin II, jasminoidin I and jasminoidin II. The pyrethrum extract has high insecticidal activity and wide insecticidal spectrum, has good control effect on various sanitary pests, warehouse pests and agricultural pests, is easy to decompose in nature with low residue, and is safe to warm-blooded animals such as human beings and livestock, so the pyrethrum extract is widely concerned by all countries in the world and is one of the safest botanical insecticides recommended to the closing ball by the grain and agriculture organization of the united nations.
However, in the prior art, pyrethrum extract is easily decomposed into water and CO by light2Which is unstable and has short drug action, there is a need for a pyrethrum extract preparation which maintains the pesticidal activity of pyrethrum extract and improves the stability of pyrethrum extract.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the pyrethrum extract aqueous emulsion and the preparation method thereof, the solvent adopts an environment-friendly solvent, the environment is not polluted, the environment is friendly to people and environment, the preservative can ensure that the product does not go bad in the effective period, the product quality is stable, and the problem of instability of the pyrethrum extract aqueous emulsion is solved; the light-proof decomposer can ensure that the influence of sunlight on products is small, ensure that the content of the products meets the standard requirement in the period of validity, and solve the problem that the pyrethrum extract is decomposed by visible light and loses insecticidal property.
The technical scheme for solving the technical problems is as follows: the pyrethrum extract aqueous emulsion comprises the following components in parts by mass: 1.0-10.0 percent of pyrethrum extract, 1-30 percent of solvent, 2-20 percent of wetting dispersant, 0.1-0.5 percent of preservative, 0.1-1 percent of thickening agent, 0.1-2 percent of light-proof decomposer and the balance of deionized water, wherein the sum of the mass fractions of the components is 100 percent.
Further, the solvent is one or a mixture of more of rosin-based vegetable oil, eucalyptus oil, mixed fatty acid, diformate, dimethyl glutarate and dimethyl adipate.
Specifically, the solvent is prepared by mixing rosin-based vegetable oil and diformate according to the weight ratio of 3: 2. The beneficial effects of adopting above-mentioned scheme are that rosin base vegetable oil mixes as the solvent with the diformate, and is safe environmental protection, does benefit to pyrethrum extract to disperse in the solvent.
Further, the wetting dispersant is one or a mixture of more of an anionic surfactant, a sulfonate anionic surfactant, a polycarboxylate polymeric dispersant and a nonionic surfactant.
Specifically, the wetting dispersant is formed by mixing sulfonate anionic surfactant and nonionic surfactant according to a weight ratio of 4: 3. The beneficial effects of adopting the scheme are that the sulfonate anionic surfactant and the nonionic surfactant are cooperatively matched to enhance the wetting and dispersing effects and promote the pyrethrum extract to be dispersed in the solvent.
Further, the preservative is benzisothiazolinone.
Further, the thickener is xanthan gum.
Further, the light decomposition preventing agent is 2, 6-di-tert-butyl-4-methylphenol.
The invention also provides a preparation method of the pyrethrum extract aqueous emulsion, which comprises the following preparation steps:
1) adding solvent into a container, adding pyrethrum extract, and stirring to obtain a mixture A;
2) adding a wetting dispersant into the mixture A obtained in the step 1), stirring, adding a preservative, a thickening agent, a light decomposition preventing agent and deionized water, and shearing and dispersing to obtain the pyrethrum extract emulsion in water.
Further, in the step 1), the rotation speed of the stirring is 15-25r/min, and the stirring time is 5-20 min.
Further, in the step 2), the rotating speed of the stirring is 15-30r/min, and the stirring time is 10-20 min.
Further, in the step 2), the rotation speed of the shear dispersion is 3000-5000r/min, and the time of the shear dispersion is 50-70 min.
The invention at least comprises the following beneficial effects:
1. the solvent of the invention adopts environment-friendly solvent, does not pollute the environment and is friendly to human and environment;
2. the preservative ensures that the pyrethrum extract aqueous emulsion does not deteriorate in the effective period and the product quality is stable; the light-proof decomposer can ensure that the influence of sunlight on products is small, ensure that the content of the pyrethrum extract meets the standard requirement in the effective period, and ensure the insecticidal performance of the pyrethrum extract aqueous emulsion; the thickening agent increases the viscosity, so that the long-time stability of a product system can be ensured, and the product is qualified in the validity period;
3. the pyrethrum extract aqueous emulsion has simple processing process, does not need heating, is convenient to produce and does not generate wastewater;
4. the pyrethrum extract aqueous emulsion replaces most of organic solvents with water, the requirement for packaging container is low, thus reduce the manufacturing cost, safe to the plant effect, greatly reduce toxicity to warm-blooded animal, it is good to mix with other pesticides and compost; the explosion danger of ignition is avoided, the pollution to the environment is reduced, and the safety is greatly improved; the atomized fog drops of the pyrethrum extract aqueous emulsion are larger in particle size than those of missible oil when the pyrethrum extract aqueous emulsion is sprayed, and the drifting of effective components and the pollution to the environment can be reduced.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
The pyrethrum extract aqueous emulsion comprises the following components in parts by mass: 1.0-10.0 percent of pyrethrum extract, 1-30 percent of solvent, 2-20 percent of wetting dispersant, 0.1-0.5 percent of preservative, 0.1-1 percent of thickening agent, 0.1-2 percent of light-proof decomposer and the balance of deionized water, wherein the sum of the mass fractions of the components is 100 percent.
The pyrethrum extract has good insecticidal effect, the insects are not easy to generate drug resistance, and the pyrethrum extract has the function of paralyzing the insects and high insecticidal speed;
the wetting dispersant has the functions of wetting and dispersing the pyrethrum extract and promoting the dispersion of the pyrethrum extract in the solvent;
the preservative has the function of ensuring that the pyrethrum extract aqueous emulsion does not deteriorate in the period of validity and the product quality is stable;
the thickener has the function of increasing viscosity and is cooperated with the preservative to ensure that a product system is stable for a long time;
the light decomposition preventing agent has the functions of preventing the pyrethrum extract in the pyrethrum extract aqueous emulsion from being decomposed by light to lose insecticidal activity and improving the stability of the product;
the raw material components are matched together, so that the problems that the pyrethrum extract aqueous emulsion is unstable, and the pyrethrum extract is easy to decompose when exposed to light and loses insecticidal property are solved, and the pyrethrum extract aqueous emulsion is environment-friendly and efficient, is low in manufacturing cost, and is safe and environment-friendly to plants.
Further, the solvent is one or a mixture of more of rosin-based vegetable oil, eucalyptus oil, mixed fatty acid, diformate, dimethyl glutarate and dimethyl adipate.
Further, the wetting dispersant is one or a mixture of more of an anionic surfactant, a sulfonate anionic surfactant, a polycarboxylate polymeric dispersant and a nonionic surfactant.
Further, the preservative is benzisothiazolinone.
Further, the thickener is xanthan gum.
Further, the light decomposition preventing agent is 2, 6-di-tert-butyl-4-methylphenol.
The invention also provides a preparation method of the pyrethrum extract aqueous emulsion, which comprises the following preparation steps:
1) adding solvent into a container, adding pyrethrum extract, and stirring to obtain a mixture A;
2) adding a wetting dispersant into the mixture A obtained in the step 1), stirring, adding a preservative, a thickening agent, a light decomposition preventing agent and deionized water, and shearing and dispersing to obtain the pyrethrum extract emulsion in water.
In the step 2), the wetting dispersant is firstly added into the mixture A to wet and disperse the pyrethrum extract, so that the pyrethrum extract is dispersed into the solvent, and the preservative thickener, the light decomposition preventing agent and the deionized water are added in the subsequent step, so that the pyrethrum extract is uniformly dispersed in the system.
Further, in the step 1), the rotation speed of the stirring is 15-25r/min, and the stirring time is 5-20 min.
Further, in the step 2), the rotating speed of the stirring is 15-30r/min, and the stirring time is 10-20 min.
Further, in the step 2), the rotation speed of the shear dispersion is 3000-5000r/min, and the time of the shear dispersion is 50-70 min.
An aqueous emulsion of pyrethrum extract and a method for preparing the same according to the present application will be described in detail with reference to examples and experimental data.
Example 1
1) Adding 180kg of rosin-based vegetable oil and 120kg of diformate into a container, adding 20kg of pyrethrum extract, and stirring at 15r/min for 5min to obtain a mixture A;
2) adding 80kg of sulfonate anionic surfactant and 60kg of nonionic surfactant into the mixture A obtained in the step 1), stirring for 5min at 15r/min, adding 5kg of benzisothiazolinone, 2kg of xanthan gum, 10kg of 2, 6-di-tert-butyl-4-methylphenol and 523kg of deionized water, and shearing and dispersing for 50min at 3000r/min to obtain the pyrethrum extract emulsion in water.
Example 2
1) Adding 180kg of rosin-based vegetable oil and 120kg of diformate into a container, adding 65kg of pyrethrum extract, and stirring at 20r/min for 10min to obtain a mixture A;
2) adding 80kg of sulfonate anionic surfactant and 60kg of nonionic surfactant into the mixture A obtained in the step 1), stirring for 5min at 30r/min, adding 5kg of benzisothiazolinone, 2kg of xanthan gum, 10kg of 2, 6-di-tert-butyl-4-methylphenol and 523kg of deionized water, and shearing and dispersing for 66min at 4500r/min to obtain the pyrethrum extract emulsion in water.
Example 3
1) Adding 180kg of rosin-based vegetable oil and 120kg of diformate into a container, adding 90kg of pyrethrum extract, and stirring at 25r/min for 20min to obtain a mixture A;
2) adding 80kg of sulfonate anionic surfactant and 60kg of nonionic surfactant into the mixture A obtained in the step 1), stirring for 20min at 30r/min, adding 5kg of benzisothiazolinone, 2kg of xanthan gum, 10kg of 2, 6-di-tert-butyl-4-methylphenol and 523kg of deionized water, and shearing and dispersing for 70min at 5000r/min to obtain the pyrethrum extract emulsion in water.
Test examples
1. Physical and chemical tests: detecting the mass fraction of the pyrethrum extract of the embodiments 1-3 by adopting liquid chromatography; pH was carried out in accordance with GB/T1601-1993.
2. Pourability test: after the sample in the container is placed for a certain period of time, pouring the sample according to a specified program, and measuring the amount of the sample staying in the container; the vessel was washed with water, and then the amount of the sample in the vessel was measured.
3. Persistent foaming: according to GB/T28137-2011.
4. Emulsion stability: the test is carried out according to GB/T1603, no floating oil (paste) exists in the measuring cylinder, and no oil or sediment exists in the measuring cylinder, so that the oil is qualified.
5. Low-temperature stability: the assay was carried out according to the method specified in GB/T19137-2003 for emulsions and homogeneous liquid preparations.
6. Heat storage stability: the measurement was carried out according to the method defined in GB/T19136-.
The results of the above tests are shown in table 1 below:
TABLE 1 test results Table
In conclusion, the pyrethrum extract aqueous emulsion uses water to replace most of organic solvents, has low requirements on a packaging container, thereby reducing the manufacturing cost, having safe effect on plants, greatly reducing the toxicity to warm-blooded animals and having good miscibility with other pesticides and fertilizers; the explosion danger of ignition is avoided, the pollution to the environment is reduced, and the safety is greatly improved; when the pyrethrum extract aqueous emulsion is sprayed, the atomized fog drops have larger particle size than missible oil, and the drifting of effective components and the pollution to the environment can be reduced; the solvent is an environment-friendly solvent, does not pollute the environment and is friendly to people and environment; the pyrethrum extract aqueous emulsion does not deteriorate in the period of validity, the product quality is stable, the product system is stable for a long time, and the product is qualified in the period of validity; the sunlight has little influence on the product, can ensure that the content of the pyrethrum extract meets the standard requirement in the effective period, and ensures the insecticidal performance of the pyrethrum extract aqueous emulsion.
While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields suitable for this invention, and further modifications can be readily made by those skilled in the art, so that the invention is not limited to the specific details, but rather can be modified and varied by those skilled in the art without departing from the general concept defined by the claims and their equivalents.
Claims (10)
1. The pyrethrum extract emulsion in water is characterized by comprising the following components in parts by mass: 1.0-10.0 percent of pyrethrum extract, 1-30 percent of solvent, 2-20 percent of wetting dispersant, 0.1-0.5 percent of preservative, 0.1-1 percent of thickening agent, 0.1-2 percent of light-proof decomposer and the balance of deionized water, wherein the sum of the mass fractions of the components is 100 percent.
2. The aqueous pyrethrum extract emulsion of claim 1, wherein the solvent is one or more of a mixture of rosin-based vegetable oil, eucalyptus oil, mixed fatty acids, esters of dicarboxylic acids, dimethyl glutarate and dimethyl adipate.
3. The aqueous pyrethrum extract emulsion of claim 1, wherein the wetting dispersant is one or more of anionic surfactant, sulfonate anionic surfactant, polycarboxylate polymeric dispersant and nonionic surfactant.
4. The pyrethrum extract aqueous emulsion of claim 1, wherein the preservative is benzisothiazolinone.
5. The pyrethrum extract aqueous emulsion of claim 1, wherein said thickener is xanthan gum.
6. The pyrethrum extract aqueous emulsion of claim 1, wherein the light decomposition inhibitor is 2, 6-di-tert-butyl-4-methylphenol.
7. The method of preparing an aqueous pyrethrum extract emulsion of any of claims 1-6, comprising the steps of:
1) adding solvent into a container, adding pyrethrum extract, and stirring to obtain a mixture A;
2) adding a wetting dispersant into the mixture A obtained in the step 1), stirring, adding a preservative, a thickening agent, a light decomposition preventing agent and deionized water, and shearing and dispersing to obtain the pyrethrum extract emulsion in water.
8. The pyrethrum extract aqueous emulsion of claim 7, wherein in step 1), the stirring speed is 15-25r/min, and the stirring time is 5-20 min.
9. The pyrethrum extract aqueous emulsion of claim 7, wherein in step 2), the stirring speed is 15-30r/min, and the stirring time is 10-20 min.
10. The pyrethrum extract aqueous emulsion of claim 7, wherein in step 2), the rotation speed of said shear dispersion is 3000-5000r/min, and the time of said shear dispersion is 50-70 min.
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Cited By (1)
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| CN116868996A (en) * | 2023-09-04 | 2023-10-13 | 成都绿金高新技术股份有限公司 | Pyrethrin emulsion with high stability and preparation method thereof |
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