CN113424867A - Preparation method of aqueous coating agent - Google Patents
Preparation method of aqueous coating agent Download PDFInfo
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- CN113424867A CN113424867A CN202110556600.6A CN202110556600A CN113424867A CN 113424867 A CN113424867 A CN 113424867A CN 202110556600 A CN202110556600 A CN 202110556600A CN 113424867 A CN113424867 A CN 113424867A
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- mixed solution
- coating agent
- aqueous coating
- deionized water
- phenolic antioxidant
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- 239000011248 coating agent Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000011259 mixed solution Substances 0.000 claims abstract description 96
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000008367 deionised water Substances 0.000 claims abstract description 33
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 33
- 239000002530 phenolic antioxidant Substances 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 27
- 229920005989 resin Polymers 0.000 claims abstract description 27
- 239000000654 additive Substances 0.000 claims abstract description 3
- 230000000996 additive effect Effects 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims abstract description 3
- 238000004821 distillation Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 235000019282 butylated hydroxyanisole Nutrition 0.000 claims description 6
- ZTHYODDOHIVTJV-UHFFFAOYSA-N Propyl gallate Chemical compound CCCOC(=O)C1=CC(O)=C(O)C(O)=C1 ZTHYODDOHIVTJV-UHFFFAOYSA-N 0.000 claims description 4
- SPSPIUSUWPLVKD-UHFFFAOYSA-N 2,3-dibutyl-6-methylphenol Chemical compound CCCCC1=CC=C(C)C(O)=C1CCCC SPSPIUSUWPLVKD-UHFFFAOYSA-N 0.000 claims description 2
- BGNXCDMCOKJUMV-UHFFFAOYSA-N Tert-Butylhydroquinone Chemical compound CC(C)(C)C1=CC(O)=CC=C1O BGNXCDMCOKJUMV-UHFFFAOYSA-N 0.000 claims description 2
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 239000007888 film coating Substances 0.000 claims description 2
- 238000009501 film coating Methods 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 235000010388 propyl gallate Nutrition 0.000 claims description 2
- 239000000473 propyl gallate Substances 0.000 claims description 2
- 229940075579 propyl gallate Drugs 0.000 claims description 2
- 239000004250 tert-Butylhydroquinone Substances 0.000 claims description 2
- 235000019281 tert-butylhydroquinone Nutrition 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 239000004255 Butylated hydroxyanisole Substances 0.000 claims 1
- CZBZUDVBLSSABA-UHFFFAOYSA-N butylated hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1.COC1=CC=C(O)C=C1C(C)(C)C CZBZUDVBLSSABA-UHFFFAOYSA-N 0.000 claims 1
- 229940043253 butylated hydroxyanisole Drugs 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract 1
- 235000012055 fruits and vegetables Nutrition 0.000 description 23
- 229920001800 Shellac Polymers 0.000 description 20
- 239000006185 dispersion Substances 0.000 description 20
- 239000004208 shellac Substances 0.000 description 20
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 description 20
- 229940113147 shellac Drugs 0.000 description 20
- 235000013874 shellac Nutrition 0.000 description 20
- 238000000746 purification Methods 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 235000013305 food Nutrition 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 150000002632 lipids Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 morpholine fatty acid salt Chemical class 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- MRBKEAMVRSLQPH-UHFFFAOYSA-N 3-tert-butyl-4-hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1 MRBKEAMVRSLQPH-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- YNAVUWVOSKDBBP-UHFFFAOYSA-N Morpholine Natural products C1COCCN1 YNAVUWVOSKDBBP-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 210000000593 adipose tissue white Anatomy 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 229940057995 liquid paraffin Drugs 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
- 108700012359 toxins Proteins 0.000 description 1
- 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 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
- A23B7/00—Preservation or chemical ripening of fruit or vegetables
- A23B7/16—Coating with a protective layer; Compositions or apparatus therefor
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Paints Or Removers (AREA)
- Storage Of Fruits Or Vegetables (AREA)
Abstract
The invention discloses a preparation method of a water-based coating agent, relating to the technical field of coating agent preparation and comprising the following steps: 1) sequentially adding 2-6 parts of phenolic antioxidant, 60-80 parts of lac resin and 4-6 parts of film-forming additive into an ethanol solution, and fully and uniformly stirring to obtain a first mixed solution, wherein the concentration of the mixture is 4-8 wt%; 2) adding a first mixed solution into deionized water under a stirring state to obtain a second mixed solution, wherein the volume ratio of the first mixed solution to the deionized water is 1: 2-8; 3) distilling the second mixed solution, removing ethanol, and concentrating; the preparation method of the aqueous coating agent has the characteristic of simple operation, and the aqueous coating agent obtained by the preparation method has the characteristics of strong oxidation resistance and good preservation effect.
Description
Technical Field
The invention relates to the technical field of preparation of coating agents, in particular to a preparation method of a water-based coating agent.
Background
The coating agent is a substance which can form a film after covering the surface of food, can prevent the invasion of microorganisms, inhibit the evaporation or absorption of water and regulate the respiration of the food, is allowed to use 7 types of coating agents such as stone fat, white oil (liquid paraffin), morpholine fatty acid salt (fruit wax), rosin pentaerythritol ester and the like, and is mainly applied to the fresh keeping of the food such as fruits, vegetables, soft sweets, eggs and the like.
At present, the coating agent for keeping fruits and vegetables fresh is relatively complex in process in the preparation process, time and labor are consumed in operation, the existing coating agent has a waterproof effect, but the nutritive value and the edible quality of the fruits and vegetables are reduced after the fruits and vegetables are stored for a period of time, and in addition, some microorganisms, especially microorganisms such as mould and the like, are easy to grow in the fruits and vegetables to decompose the nutritional ingredients in the fruits and vegetables; and simultaneously, a plurality of intermediate products and even toxins are generated, which seriously affect the life and property safety of consumers.
Disclosure of Invention
The present invention aims to provide a method for preparing an aqueous coating agent, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of an aqueous film coating agent comprises the following steps:
1) sequentially adding 2-6 parts of phenolic antioxidant, 60-80 parts of lac resin and 4-6 parts of film-forming additive into an ethanol solution, and fully and uniformly stirring to obtain a first mixed solution, wherein the concentration of the mixture is 4-8 wt%;
2) adding a first mixed solution into deionized water under a stirring state to obtain a second mixed solution, wherein the volume ratio of the first mixed solution to the deionized water is 1: 2-8;
3) and distilling the second mixed solution, removing ethanol, and concentrating to obtain the final product.
As a further scheme of the invention: the stirring speed in the step 2) is 5000-8000 rpm, and the first mixed solution is added into the deionized water in the form of liquid flow with the diameter of 5-8 mm.
As a still further scheme of the invention: the adding speed of the first mixed solution in the step 2) is 3-15 ml/min.
As a still further scheme of the invention: the phenolic antioxidant in the step 1) is butyl hydroxy anisol or dibutyl hydroxy toluene or propyl gallate or tert-butyl hydroquinone.
As a still further scheme of the invention: the distillation treatment in the step 3) is reduced pressure distillation treatment, wherein the temperature is controlled to be 30-50 ℃ and the absolute pressure is 0.02-0.04 MPa in the reduced pressure distillation treatment process.
As a still further scheme of the invention: concentrating the second mixed solution in the step 3) to 1/5-1/2 of the original volume.
Compared with the prior art, the invention has the beneficial effects that: 1. the product is not required to be emulsified, and is directly dissolved in an alcohol solvent for use, so that the operation is simple; 2. the water-based coating agent prepared from the lac resin and the phenolic antioxidant can effectively isolate the contact between air and fruits and vegetables, can effectively control the problems of water loss, mildew and the like of the fruits and vegetables during transportation, storage and storage, achieves the purposes of delaying lipid oxidation, improving the attractiveness of the fruits and vegetables and prolonging the storage period of the fruits and vegetables, has good stability and water resistance of the used lac resin, and can prolong the quality guarantee period and the service life of the water-based coating agent.
Detailed Description
The invention will now be described in further detail with reference to the following examples, which are not intended to limit the invention in any way, and all changes which can be made in accordance with the invention are intended to be within the scope of the invention, in which the proportions of the various components in the examples are by weight unless otherwise specified, and in which the materials are by dry weight.
Example 1
1. Preparing a first mixed solution
Adding 0.6kg of shellac resin, 0.2kg of phenolic antioxidant and 0.4kg of film-forming aid into 8.8kg of absolute ethanol, stirring and dissolving to prepare a first mixed solution, wherein the mass ratio of the total mass of the shellac resin, the phenolic antioxidant and the film-forming aid to the absolute ethanol is 1.2:8.8, that is, the mass percentage concentration of the effective components in the first mixed solution is 12%, that is, 6g of shellac resin, 2g of phenolic antioxidant and 4g of film-forming aid are added into every 88g of absolute ethanol or 6kg of shellac resin, 2kg of phenolic antioxidant and 4kg of film-forming aid are added into 88kg of absolute ethanol.
In the present invention, the phenolic antioxidant is Butylated Hydroxyanisole (BHA).
2. Preparing the second mixed solution
Putting 3L of deionized water into a dispersion machine (Ultra-Turrax T25 digital dispersion machine, Germany IKA company), and adding 1L of the first mixed solution prepared in the step 1 into the dispersion machine under a stirring state, wherein the first mixed solution prepared in the step 1 flows out from a liquid column flow nozzle (Donggangbo original spray purification equipment Co., Ltd.) by adopting a constant flow pump (BT 100-1J), a cylindrical liquid flow is formed and added into the deionized water of the dispersion machine, and the diameter of the nozzle is controlled to be 5mm, namely the diameter of the linear liquid flow of the first mixed solution added into the deionized water is 5 mm; the speed of adding the first mixed solution is 9ml/min, namely the speed of adding the first mixed solution into 1L of deionized water is 3ml/min, after the first mixed solution is added, the stirring is stopped to prepare a second mixed solution, wherein the stirring speed is 6000rpm, and the volume ratio of the first mixed solution to the deionized water is 1: 3.
3. distilling and concentrating
And (3) putting 4L of the second mixed solution into a reduced pressure evaporator (Shanghai Shen biotechnology, Inc.) for reduced pressure distillation treatment, removing ethanol by reduced pressure distillation, and concentrating to 1L to obtain the aqueous coating agent, wherein the distillation temperature in the reduced pressure distillation treatment process is 40 ℃, the absolute pressure is 0.04MPa, the volume ratio of the first mixed solution to the aqueous coating agent is 4:1, namely the first mixed solution is concentrated to 1/4 of the original volume, and the aqueous coating agent obtained in the embodiment is uniformly sprayed on the surface of the fruit and vegetable by a humidifier or manually sprayed on the surface of the fruit and vegetable in an artificial mode.
Example 2
1. Preparing a first mixed solution
Adding 0.8kg of shellac resin, 0.4kg of phenolic antioxidant and 0.5kg of film-forming aid into 8.3kg of absolute ethanol, stirring and dissolving to prepare a first mixed solution, wherein the mass ratio of the total mass of the shellac resin, the phenolic antioxidant and the film-forming aid to the absolute ethanol is 1.7:8.3, that is, the mass percentage concentration of the effective components in the first mixed solution is 17%, that is, 8g of shellac resin, 4g of phenolic antioxidant and 5g of film-forming aid are added into 83g of absolute ethanol or 8kg of shellac resin, 4kg of phenolic antioxidant and 5kg of film-forming aid are added into 83kg of absolute ethanol.
In the present invention, the phenolic antioxidant is Butylated Hydroxyanisole (BHA).
2. Preparing the second mixed solution
Putting 8L of deionized water into a dispersion machine (Ultra-Turrax T25 digital dispersion machine, Germany IKA company), and adding 1L of the first mixed solution prepared in the step 1 into the dispersion machine under a stirring state, wherein the first mixed solution prepared in the step 1 flows out from a liquid column flow nozzle (Donggangbo original spray purification equipment Co., Ltd.) by adopting a constant flow pump (BT 100-1J), a cylindrical liquid flow is formed and added into the deionized water of the dispersion machine, and the diameter of the nozzle is controlled to be 8mm, namely the diameter of the linear liquid flow of the first mixed solution added into the deionized water is 8 mm; the speed of adding the first mixed solution is 3ml/min, namely the speed of adding the first mixed solution into 1L of deionized water is 3ml/min, after the first mixed solution is added, the stirring is stopped to prepare a second mixed solution, wherein the stirring speed is 6000rpm, and the volume ratio of the first mixed solution to the deionized water is 1: 8.
3. distilling and concentrating
And (3) putting 9L of the second mixed solution into a reduced pressure evaporator (Shanghai Shen biotechnology, Inc.) for reduced pressure distillation treatment, removing ethanol by reduced pressure distillation, and concentrating to 3L to obtain the aqueous coating agent, wherein the distillation temperature in the reduced pressure distillation treatment process is 50 ℃, the absolute pressure is 0.03MPa, the volume ratio of the first mixed solution to the aqueous coating agent is 3:1, namely the first mixed solution is concentrated to 1/3 of the original volume, and the aqueous coating agent obtained in the embodiment is uniformly sprayed on the surfaces of the fruits and vegetables by a humidifier or manually sprayed on the surfaces of the fruits and vegetables in an artificial mode.
Example 3
1. Preparing a first mixed solution
Adding 0.7kg of shellac resin, 0.6kg of phenolic antioxidant and 0.6kg of film-forming aid into 8.1kg of absolute ethanol, stirring and dissolving to prepare a first mixed solution, wherein the mass ratio of the total mass of the shellac resin, the phenolic antioxidant and the film-forming aid to the absolute ethanol is 1.9:8.1, that is, the mass percentage concentration of the active ingredients in the first mixed solution is 19%, that is, 7g of shellac resin, 6g of phenolic antioxidant and 6g of film-forming aid are added into every 81g of absolute ethanol or 7kg of shellac resin, 6kg of phenolic antioxidant and 5kg of film-forming aid are added into 81kg of absolute ethanol.
In this example, the phenolic antioxidant is Butylated Hydroxyanisole (BHA).
2. Preparing the second mixed solution
Putting 6L of deionized water into a dispersion machine (Ultra-Turrax T25 digital dispersion machine, Germany IKA company), and adding 1L of the first mixed solution prepared in the step 1 into the dispersion machine under a stirring state, wherein the first mixed solution prepared in the step 1 flows out from a liquid column flow nozzle (Donggangbo original spray purification equipment Co., Ltd.) by adopting a constant flow pump (BT 100-1J), a cylindrical liquid flow is formed and added into the deionized water of the dispersion machine, and the diameter of the nozzle is controlled to be 7mm, namely the diameter of the linear liquid flow of the first mixed solution added into the deionized water is 7 mm; the speed of adding the first mixed solution is 10ml/min, namely the speed of adding the first mixed solution into 1L of deionized water is 10ml/min, after the first mixed solution is added, the stirring is stopped to prepare a second mixed solution, wherein the stirring speed is 8000rpm, and the volume ratio of the first mixed solution to the deionized water is 1: 6.
3. distilling and concentrating
And (3) putting 10L of the second mixed solution into a reduced pressure evaporator (Shanghai Shen biotechnology, Inc.) for reduced pressure distillation treatment, removing ethanol by reduced pressure distillation, and concentrating to 2L to obtain the aqueous coating agent, wherein the distillation temperature in the reduced pressure distillation treatment process is 35 ℃, the absolute pressure is 0.02MPa, the volume ratio of the first mixed solution to the aqueous coating agent is 5:1, namely the first mixed solution is concentrated to 1/5 of the original volume, and the aqueous coating agent obtained in the embodiment is uniformly sprayed on the surface of the fruit and vegetable by a humidifier or manually sprayed on the surface of the fruit and vegetable in a manual mode.
Example 4
1. Preparing a first mixed solution
Adding 0.65kg of shellac resin, 0.5kg of phenolic antioxidant and 0.35kg of film-forming aid into 8.6kg of absolute ethanol, stirring and dissolving to prepare a first mixed solution, wherein the mass ratio of the total mass of the shellac resin, the phenolic antioxidant and the film-forming aid to the absolute ethanol is 1.4:8.6, that is, the mass percentage concentration of the effective components in the first mixed solution is 14%, that is, 6.5g of shellac resin, 5g of phenolic antioxidant and 3.5g of film-forming aid are added into 86g of absolute ethanol or 6.5kg of shellac resin, 5kg of phenolic antioxidant and 3.5kg of film-forming aid are added into 86kg of absolute ethanol.
In this example, the phenolic antioxidant is Butylated Hydroxyanisole (BHA).
2. Preparing the second mixed solution
Placing 7L of deionized water into a dispersion machine (Ultra-Turrax T25 digital dispersion machine, Germany IKA company), and adding 1L of the first mixed solution prepared in the step 1 into the dispersion machine under a stirring state, wherein the first mixed solution prepared in the step 1 flows out from a liquid column flow nozzle (Donggangbo original spray purification equipment Co., Ltd.) by adopting a constant flow pump (BT 100-1J), a cylindrical liquid flow is formed and added into the deionized water of the dispersion machine, and the diameter of the nozzle is controlled to be 6mm, namely the diameter of the linear liquid flow of the first mixed solution added into the deionized water is 6 mm; the speed of adding the first mixed solution is 14ml/min, namely the speed of adding the first mixed solution into 1L of deionized water is 14ml/min, after the first mixed solution is added, the stirring is stopped to prepare a second mixed solution, wherein the stirring speed is 8000rpm, and the volume ratio of the first mixed solution to the deionized water is 1: 7.
3. distilling and concentrating
And (3) putting 8L of the second mixed solution into a reduced pressure evaporator (Shanghai Shen biotechnology, Inc.) for reduced pressure distillation treatment, removing ethanol by reduced pressure distillation, and concentrating to 2L to obtain the aqueous coating agent, wherein the distillation temperature in the reduced pressure distillation treatment process is 45 ℃, the absolute pressure is 0.025MPa, the volume ratio of the first mixed solution to the aqueous coating agent is 4:1, namely the first mixed solution is concentrated to 1/4 of the original volume, and the aqueous coating agent obtained in the embodiment is uniformly sprayed on the surface of the fruit and vegetable by a humidifier or manually sprayed on the surface of the fruit and vegetable in a manual mode.
Example 5
1. Preparing a first mixed solution
Adding 0.75kg of shellac resin, 0.3kg of phenolic antioxidant and 0.55kg of film-forming aid into 8.4kg of absolute ethanol, stirring and dissolving to prepare a first mixed solution, wherein the mass ratio of the total mass of the shellac resin, the phenolic antioxidant and the film-forming aid to the absolute ethanol is 1.6:8.4, that is, the mass percentage concentration of the effective components in the first mixed solution is 14%, that is, 7.5g of shellac resin, 3g of phenolic antioxidant and 5.5g of film-forming aid are added into 84g of absolute ethanol or 7.5kg of shellac resin, 3kg of phenolic antioxidant and 5.5kg of film-forming aid are added into 84kg of absolute ethanol.
In this example, the phenolic antioxidant is Butylated Hydroxyanisole (BHA).
2. Preparing the second mixed solution
Putting 5L of deionized water into a dispersion machine (Ultra-Turrax T25 digital dispersion machine, Germany IKA company), and adding 1L of the first mixed solution prepared in the step 1 into the dispersion machine under a stirring state, wherein the first mixed solution prepared in the step 1 flows out from a liquid column flow nozzle (Donggangbo original spray purification equipment Co., Ltd.) by adopting a constant flow pump (BT 100-1J), a cylindrical liquid flow is formed and added into the deionized water of the dispersion machine, the diameter of the nozzle is controlled to be 6.5mm, namely the diameter of the linear liquid flow of the first mixed solution added into the deionized water is 6.5 mm; the speed of adding the first mixed solution is 12ml/min, namely the speed of adding the first mixed solution into 1L of deionized water is 12ml/min, after the first mixed solution is added, the stirring is stopped to prepare a second mixed solution, wherein the stirring speed is 4000rpm, and the volume ratio of the first mixed solution to the deionized water is 1: 5.
3. distilling and concentrating
And (3) putting 6L of the second mixed solution into a reduced pressure evaporator (Shanghai Shen biotechnology, Inc.) for reduced pressure distillation treatment, removing ethanol by reduced pressure distillation, and concentrating to 2L to obtain the aqueous coating agent, wherein the distillation temperature in the reduced pressure distillation treatment process is 45 ℃, the absolute pressure is 0.035MPa, the volume ratio of the first mixed solution to the aqueous coating agent is 3:1, namely the first mixed solution is concentrated to 1/3 of the original volume, and the aqueous coating agent obtained in the embodiment is uniformly sprayed on the surfaces of the fruits and vegetables by a humidifier or manually sprayed on the surfaces of the fruits and vegetables in a manual mode.
The beneficial results are that: 1. the product is not required to be emulsified, and is directly dissolved in an alcohol solvent for use, so that the operation is simple; 2. the water-based coating agent prepared from the lac resin and the phenolic antioxidant can effectively isolate the contact between air and fruits and vegetables, can effectively control the problems of water loss, mildew and the like of the fruits and vegetables during transportation, storage and storage, achieves the purposes of delaying lipid oxidation, improving the attractiveness of the fruits and vegetables and prolonging the storage period of the fruits and vegetables, has good stability and water resistance of the used lac resin, and can prolong the quality guarantee period and the service life of the water-based coating agent.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. A preparation method of an aqueous film coating agent is characterized by comprising the following steps:
1) sequentially adding 2-6 parts of phenolic antioxidant, 60-80 parts of lac resin and 4-14 parts of film-forming additive into an ethanol solution, and fully and uniformly stirring to obtain a first mixed solution, wherein the concentration of the mixture is 4-8 wt%;
2) adding a first mixed solution into deionized water under a stirring state to obtain a second mixed solution, wherein the volume ratio of the first mixed solution to the deionized water is 1: 2-8;
3) and distilling the second mixed solution, removing ethanol, and concentrating to obtain the final product.
2. The method for preparing an aqueous coating agent according to claim 1, wherein the stirring speed in step 2) is 5000-8000 rpm, and the first mixed solution is added to the deionized water in the form of a liquid stream having a diameter of 5-8 mm.
3. The method for producing an aqueous coating agent according to claim 1 or 2, wherein the rate of addition of the first mixed solution in step 2) is 3 to 15 ml/min.
4. The method for preparing an aqueous coating agent according to claim 1 or 2, wherein the phenolic antioxidant in step 1) is butylated hydroxyanisole, dibutyl hydroxytoluene, propyl gallate or tert-butyl hydroquinone.
5. The method for preparing an aqueous coating agent according to claim 1, wherein the distillation treatment in step 3) is a reduced pressure distillation treatment, and the temperature is controlled to be 30 to 50 ℃ and the absolute pressure is 0.02 to 0.04MPa in the reduced pressure distillation treatment process.
6. The method for producing an aqueous coating agent according to claim 1 or 5, wherein the second mixed solution in step 3) is concentrated to 1/5 to 1/2 of its original volume.
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| CN1466883A (en) * | 2002-07-12 | 2004-01-14 | 上海三瑞化学有限公司 | Bi-component edible fruit and vegetable coating fresh-keeping agent and uses thereof |
| US20040103821A1 (en) * | 2002-11-29 | 2004-06-03 | Freund Industrial Co., Ltd. | Aqueous shellac coating agent and production process therefor, and coated food and production process therefor, coated drug and production process therefor, glazing composition for oil-based confectionary, glazing process, and glazed oil-based confectionary using same |
| CN102318673A (en) * | 2011-08-15 | 2012-01-18 | 浙江大学 | Castanea henryi coating fresh-keeping agent |
| CN107494719A (en) * | 2017-09-18 | 2017-12-22 | 重庆市碾盘生态农业开发有限责任公司 | The ventilative edible preserving fruit and vegetable utilizing film forming agent of one kind |
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2021
- 2021-05-21 CN CN202110556600.6A patent/CN113424867A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1466883A (en) * | 2002-07-12 | 2004-01-14 | 上海三瑞化学有限公司 | Bi-component edible fruit and vegetable coating fresh-keeping agent and uses thereof |
| US20040103821A1 (en) * | 2002-11-29 | 2004-06-03 | Freund Industrial Co., Ltd. | Aqueous shellac coating agent and production process therefor, and coated food and production process therefor, coated drug and production process therefor, glazing composition for oil-based confectionary, glazing process, and glazed oil-based confectionary using same |
| CN102318673A (en) * | 2011-08-15 | 2012-01-18 | 浙江大学 | Castanea henryi coating fresh-keeping agent |
| CN107494719A (en) * | 2017-09-18 | 2017-12-22 | 重庆市碾盘生态农业开发有限责任公司 | The ventilative edible preserving fruit and vegetable utilizing film forming agent of one kind |
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