CN111909788B - Preparation method of zinc oxide waste edible oil coagulant - Google Patents
Preparation method of zinc oxide waste edible oil coagulant Download PDFInfo
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- CN111909788B CN111909788B CN202010617649.3A CN202010617649A CN111909788B CN 111909788 B CN111909788 B CN 111909788B CN 202010617649 A CN202010617649 A CN 202010617649A CN 111909788 B CN111909788 B CN 111909788B
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
- C11B5/00—Preserving by using additives, e.g. anti-oxidants
- C11B5/0092—Mixtures
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes
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Abstract
The invention belongs to the field of high polymer materials, in particular to a preparation method of a zinc oxide waste edible oil coagulant, which has simple production process and wide raw material sources, is prepared by carrying out graft polymerization modification on zinc oxide gel through hydrothermal synthesis and wax crystal load consisting of white insect wax, beeswax and poly (12-hydroxystearate), has good coagulating effect, is applicable to a plurality of oils, realizes quick coagulation of waste edible oil through chemical and physical dual effects, and has the advantages that the coagulating point of the oil becomes high and the fog point is improved by adding the coagulant, the coagulant is nontoxic, odorless and environment-friendly, has a certain antibacterial fresh-keeping effect, slows down the deterioration of the oil in the coagulating process and the coagulating transportation process, and is easier to treat a large amount of waste edible oil such as catering, food processing factories, home kitchens and the like.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and in particular relates to a preparation method of a zinc oxide waste edible oil coagulant.
Background
The waste edible oil coagulant is a frequently used article by housewives abroad. The chicken, fried steak and fried balls at home are emphasized in the factors of detail and environmental pollution, and excessive oil after being fried cannot be directly poured into a water tank sewer, because the pipeline is blocked due to long time, and meanwhile, peculiar smell is also emitted. In order not to generate peculiar smell, people generally like clean and tidy home environment, and the waste edible oil is properly treated to ensure good sanitary habit. The waste oil is poured into a bowl, then the coagulant is added, almost all the oil is coagulated into blocks within 20 minutes, then the blocks are wrapped by newspapers and placed in a plastic bag, and the waste oil is thrown away when being fixed, so that the pot is convenient to clean, and the environment is not polluted. The sewage is free from sunlight irradiation, dark and moist, bacteria breeding, foul smell and rich in content, and the sewage is not only provided with grease and detergent discharged from a kitchen, but also provided with washing powder, laundry detergent and cloth fiber discharged from a washing machine, bath liquid, hair conditioner and a large amount of hair discharged from a bathroom. This condition is called sewer overflow. Individuals who physically experience sewer overflows often leave a certain psychological shadow, as the process is particularly nausea. Sewer overflow occurs, and bacteria in the sewer can be permeated into the underground water by sewage to pollute the ecological environment, so that human beings suffer from gastrointestinal diseases. Spills in the vicinity of lakes and oceans can cause death of fish, plankton and other aquatic organisms and even the risk of illness in large marine mammals such as sea lions and seals. Humans can also have varying degrees of adverse effects after eating animals contaminated with sewage. So that the beach of the area can be closed in time, swimming is restricted and eating of the aquatic products is prohibited after sewage overflows in certain countries. According to the statistics of the United states Environmental Protection Agency (EPA), at least 23000-75000 sewer overflow events occur annually in the whole United states. And canada, italy, france have plagued public health problems for many years that also result from preventing sewer overflows. While most sewer overflows are caused by blockages, almost half of the blockages are waste food oil. In China, the comprehensive factors such as large oil content, population base, diet structure, sewer drain pipe diameter and the like are considered, and especially the proper treatment of waste edible oil such as hot pot, fried food and the like is a difficult problem to be solved urgently. The common residential building drainage pipeline is often blocked by fat accumulation, so that the drainage dredging industry is rapidly and vigorously developed, and various drainage functions are almost seen in the street and the alley. But the elimination is basically temporary and temporary. The special grease coagulant can discard the coagulated oil as combustible garbage. Some dishes require large amounts of oil to cook, which is not suitable for repeated use, and in some countries can be recovered exclusively as a renewable resource for use in diesel engines. But also can be used as industrial raw materials such as soap, paint, etc., fertilizer, feed, etc. Maleic acid ester polymers. Chinese patent CN2019107625139 discloses a maleate polymer, a waste edible oil coagulant and a preparation method thereof, but the maleate polymer has no lubrication effect and has odor, and the special viscosity reducer comprising the maleate polymer has strong hydrogen bond forming capability and strong penetrating and dispersing capabilities through molecules, and enters colloid molecules to break up internal structures, so that the viscosity of oil is reduced, the waste edible oil coagulant is not beneficial to the solidification of waste edible oil, the use effect is poor, and along with the gradual implementation of the garbage classification policy in China, the garbage classification is realized by using recoverable materials, harmful garbage, kitchen garbage (including kitchen garbage, household kitchen garbage and other kitchen garbage), the use amount of waste oil is large, the problem is more involved, the recycling value is high, and a preparation method of the zinc oxide waste edible oil coagulant is needed to be developed by technicians in the field so as to meet the existing use requirement and performance requirement, improve the utilization efficiency and lighten the burden of disposal of household garbage terminals.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a preparation method of a zinc oxide waste edible oil coagulant.
The invention is realized by the following technical scheme:
the preparation method of the zinc oxide waste edible oil coagulant comprises the following steps: (1) Adding 18-20 parts of glycerol into 8-10 parts of zinc acetate solution with the mass fraction of 10% -15%, transferring to a hydrothermal reaction kettle, adding 25-30 parts of zinc nitrate solution with the mass fraction of 8% -10% and 2-4 parts of ion exchange resin 717, placing in the hydrothermal reaction kettle, slowly adding 1-2 parts of template agent polyacrylic acid, uniformly stirring, adding 2-4 parts of gel accelerator propylene oxide, carrying out hydrothermal stirring reaction at 90-95 ℃ for 1-3 hours, and filtering to obtain nano zinc oxide gel; (2) preparation of grafted modified nano zinc oxide gel: adding 18-20 parts of the nano zinc oxide gel obtained in the step (1) into 20-30 parts of water, carrying out ultrasonic treatment for 18-20 minutes, transferring the mixture into another reaction kettle, adding 2-4 parts of dimethyl diallyl ammonium chloride and 0.01-0.05 part of an initiator into the reaction kettle at the temperature of 75-80 ℃ and the stirring speed of 300-350 rpm, reacting for 10-15 minutes, adding 2-4 parts of allyl glycidyl ether and 1-2 parts of a cross-linking agent, reacting for 10-15 minutes, adding 0.8-1 part of allyl glycidyl ether, carrying out heat preservation and stirring reaction for 2-4 hours, cooling to room temperature, regulating the pH value of a system to 6.8-7.0 by using hydrochloric acid with the weight fraction of 1.0%, transferring the gel into a shaping mold, preparing wet gel, washing the wet gel by deionized water, and carrying out vacuum freeze drying treatment to obtain grafted modified zinc oxide gel; (3) Placing insect white wax, beeswax and poly (12-hydroxystearic acid) stearate in a weight ratio of 1-2:2-3:3-4 into an impregnating tank, completely melting the insect white wax, beeswax and the stearate into wax crystal liquid at 75-80 ℃, placing the beaker into a vacuum oven at 75-80 ℃, putting the grafted modified zinc oxide gel prepared in the step (2) into the impregnating tank, impregnating the dipping tank by adopting a vacuum impregnation method, sealing a tank cover, starting vacuumizing, wherein the negative pressure in the tank is 0.07-0.08 MPa, vacuumizing for 10-15 min, releasing pressure, filtering, taking out the grafted modified zinc oxide gel impregnated with the wax crystal liquid, cooling the grafted modified zinc oxide gel at 30-35 ℃ for 12-24 h, and grinding the grafted modified zinc oxide gel into powder of 500-800 meshes by a ball mill to obtain the zinc oxide waste edible oil coagulant.
Further, the initiator in the step (2) is one of azobisisopropylimidazoline hydrochloride, potassium persulfate and azobisisobutyrimidine hydrochloride.
Further, the cross-linking agent in the step (2) is formed by mixing 0.05-0.4 part of bis (dioctyl-oxy-pyrophosphato) ethylene titanate, 0.01-0.02 part of sodium salt of 4- (N-maleimidomethyl) cyclohexane-1-carboxylic acid sulfosuccinimidyl ester and 0.1-0.2 part of N, N-methylene bisacrylamide.
Further, in the step (3), the ball mill is one of a conical ball mill, a superfine lamination ball mill, a ceramic ball mill or a lattice ball mill.
The waste edible oil is natural animal oil or vegetable oil, such as olive oil, cocoa butter, coconut oil, beef tallow, almond oil, wheat germ oil, rice germ oil, safflower oil, soybean oil, tea seed oil, camellia oil, corn oil, jojoba oil, lard, sheep oil, rapeseed oil, avocado oil, linseed oil, walnut oil, perilla oil, palm oil, sunflower seed oil, safflower oil, sesame oil, cottonseed oil, rice bran oil, peanut oil.
According to the invention, zinc oxide gel is prepared through hydrothermal reaction, so that the effect of waste edible oil on a motion interface is influenced, zinc oxide is nontoxic and harmless, further application of waste edible oil in the fields of feed, fertilizer, soap and the like is not influenced, further graft polymerization modification and wax crystal liquid loading are adopted, so that zinc oxide can promote formation, growth and precipitation of wax crystals in the oil of the waste edible oil through interaction with insect wax and the like, the room temperature fluidity of the waste edible oil is reduced macroscopically, the waste edible oil is solidified, the precipitation of part of the insect wax, beeswax and poly (12-hydroxystearic acid) stearate loaded by zinc oxide promotes the improvement of foggy spots of grease, and the wax crystals in the oil are increased and accumulated as crystal nuclei to form a solidification effect. The grafting polymerization modified zinc oxide realizes grafting in the process of initiating polymerization through a cross-linking agent and an initiator, a high molecular long chain and a porous microstructure are adsorbed on the precipitated wax crystal, the crystal form is distorted, the surface characteristics of the wax crystal are changed, the growth of the wax crystal is promoted to form a body type structure, the wax crystal is precipitated together, a side chain of a long high molecular chain and the wax are eutectic, a polar group promotes the wax crystal to further grow, the grafting modified zinc oxide coagulant has certain surface activity, the solubility of the insect white wax in edible oil can be reduced, and the wax precipitation amount is increased. The fluidity of the waste edible oil is reduced, flaky and needle-shaped wax crystals are precipitated at low temperature due to the addition of the coagulant, under the conditions that the edible oil mist point is raised and the solidifying point is raised, the wax crystals are mutually combined to form a body type structure, and important impurities colloid, starch residue and the like in the waste edible oil are adsorbed around the wax crystals or are wrapped in the body type structure to form a wax paste-like substance, so that the fluidity of the used oil is reduced, and the macroscopic solidification effect of the waste edible oil is caused. The invention promotes solidification and simultaneously performs synergistic action with the antibacterial performance of zinc oxide by modifying methods such as graft polymerization, so that the invention has a certain antibacterial and fresh-keeping effect.
The method has the advantages that the production process is simple, the raw material sources are wide, zinc oxide gel is synthesized through hydrothermal process, graft polymerization modification is carried out on the zinc oxide gel, wax crystal load consisting of insect white wax, beeswax and poly (12-hydroxystearic acid) stearate is used for preparing the zinc oxide waste edible oil coagulant, the coagulant has good coagulation effect, is suitable for a large amount of oil, realizes quick coagulation of waste edible oil through chemical and physical dual effects, the coagulation point of the oil is increased by adding the coagulant, the foggy point of the oil is improved, the coagulant is nontoxic, odorless and environment-friendly, grafted and dimethyl diallyl ammonium chloride and zinc oxide act, the coagulated waste edible oil has a certain antibacterial fresh-keeping effect, and the occurrence of oil deterioration is slowed down in the coagulation process and the coagulation transportation process, so that a large amount of waste edible oil such as catering, food processing factories, home kitchens and the like is easier to treat.
Description of the embodiments
The invention is illustrated, but not limited, by the following specific examples.
Example 1
The preparation method of the zinc oxide waste edible oil coagulant comprises the following steps: (1) Adding 20 parts of glycerol into 5 parts of zinc acetate solution with the mass fraction of 15%, transferring to a hydrothermal reaction kettle, adding 30 parts of zinc nitrate solution with the mass fraction of 10% and 4 parts of ion exchange resin 717, placing in the hydrothermal reaction kettle, slowly adding 2 parts of template agent polyacrylic acid, uniformly stirring, adding 4 parts of gel accelerator propylene oxide, carrying out hydrothermal stirring reaction at 95 ℃ for 3 hours, and filtering to obtain nano zinc oxide gel; (2) preparation of grafted modified nano zinc oxide gel: adding 18 parts of nano zinc oxide gel obtained in the step (1) into 30 parts of water, carrying out ultrasonic treatment for 20min, transferring the mixture into another reaction kettle, adding 4 parts of dimethyl diallyl ammonium chloride and 0.05 part of initiator azo diisopropyl imidazoline hydrochloride into the reaction kettle at the water bath of 80 ℃ and the stirring speed of 350rpm, reacting for 15min, adding 4 parts of allyl glycidyl ether and 2 parts of cross-linking agent, reacting for 15min, adding 1 part of allyl glycidyl ether, carrying out heat preservation and stirring for 4h, cooling to room temperature, regulating the pH value of a system to 7.0 by using hydrochloric acid with the weight fraction of 1.0%, transferring the gel into a shaping mold, preparing wet gel, washing the wet gel by using deionized water, and carrying out vacuum freeze drying treatment to obtain grafted modified zinc oxide gel; (3) Placing insect white wax, beeswax and poly (12-hydroxystearic acid) stearate in a weight ratio of 1:2:3 into an impregnating tank, completely melting into wax crystal liquid at 80 ℃, placing the beaker into a vacuum oven at 80 ℃, putting the grafted modified zinc oxide gel prepared in the step (2) into the impregnating tank, impregnating the zinc oxide gel by adopting a vacuum impregnation method, sealing a tank cover, starting vacuumizing, taking out the grafted modified zinc oxide gel impregnated with the wax crystal liquid by vacuum filtration, cooling the zinc oxide gel at 35 ℃ for 24 hours, grinding the zinc oxide gel into powder of 800 meshes by a conical ball mill, and obtaining the zinc oxide waste edible oil coagulant, wherein the cross-linking agent in the step (2) is prepared by mixing 0.4 part of bis (dioctyl-oxy pyrophosphoric acid ester) ethylene titanate, 0.02 part of 4- (N-maleimidomethyl) cyclohexane-1-carboxylic acid sulfosuccinimido sodium salt and 0.2 part of N, N-methylene bisacrylamide.
Example 2
The preparation method of the zinc oxide waste edible oil coagulant comprises the following steps: (1) Adding 20 parts of glycerol into 8 parts of zinc acetate solution with the mass fraction of 15%, transferring to a hydrothermal reaction kettle, adding 30 parts of zinc nitrate solution with the mass fraction of 10% and 4 parts of ion exchange resin 717, placing into the hydrothermal reaction kettle, slowly adding 2 parts of template agent polyacrylic acid, uniformly stirring, adding 2 parts of gel accelerator propylene oxide, carrying out hydrothermal stirring reaction at 90 ℃ for 1 hour, and filtering to obtain nano zinc oxide gel; (2) preparation of grafted modified nano zinc oxide gel: adding 20 parts of nano zinc oxide gel obtained in the step (1) into 20 parts of water, carrying out ultrasonic treatment for 18min, transferring the mixture into another reaction kettle, adding 2 parts of dimethyl diallyl ammonium chloride and 0.05 part of initiator azo diisobutylamidine hydrochloride into the reaction kettle at the water bath of 75 ℃ and the stirring speed of 300rpm, reacting for 10min, adding 4 parts of allyl glycidyl ether and 1 part of cross-linking agent, reacting for 10min, adding 0.8 part of allyl glycidyl ether, carrying out heat preservation and stirring for 2h, cooling to room temperature, regulating the pH value of a system to 6.8 by using hydrochloric acid with the weight fraction of 1.0%, transferring the mixture into a shaping mold for gel, preparing wet gel, washing the wet gel by using deionized water, and carrying out vacuum freeze drying treatment to obtain grafted modified zinc oxide gel; (3) Placing insect white wax, beeswax and poly (12-hydroxystearic acid) stearate in a weight ratio of 2:3:4 into an impregnating tank, completely melting into wax crystal liquid at 75 ℃, placing the beaker into a vacuum oven at 80 ℃, putting the grafted modified zinc oxide gel prepared in the step (2) into the impregnating tank, impregnating the zinc oxide gel by adopting a vacuum impregnation method, sealing a tank cover, starting vacuumizing, taking out the grafted modified zinc oxide gel impregnated with the wax crystal liquid by vacuum filtration after the vacuum pumping for 10min under the condition of negative pressure in the tank, cooling the zinc oxide gel for 12h at 30 ℃, grinding the zinc oxide gel into powder of 800 meshes by a superfine lamination ball mill, and obtaining the zinc oxide waste edible oil coagulant, wherein the cross-linking agent in the step (2) is prepared by mixing 0.4 part of bis (dioctyloxypyrophosphate) ethylene titanate, 0.02 part of sodium salt of 4- (N-iminomethyl) cyclohexane-1-carboxylic acid sulfosuccinimido ester and 0.1 part of N, N-methylene bisacrylamide.
Comparative example 1
In this comparative example 1, poly (12-hydroxystearic acid) stearate was not used in step (3) as compared to example 1, except that the process steps were the same.
Comparative example 2
In this comparative example 2, no beeswax was used in step (3) as compared with example 2, except that the procedure was the same.
Comparative example 3
In this comparative example 3, as compared with example 2, the mixture of insect white wax, beeswax and poly (12-hydroxystearic acid) stearate was not used for impregnation in step (3), except that the process steps were the same.
Comparative example 4
In this comparative example 4, step (2) was omitted as compared with example 2, except that the procedure was the same.
The results of the performance test of the edible oil coagulants of examples 1 to 2 and comparative examples 1 to 4 are shown in tables 1, 2 and 3:
table 1 results of physical and chemical property test and comparison of edible oil and fat coagulants of examples and comparative examples 1 to 4
Note that: reference is made to the Japanese general Standard JIS K5101-13-1-2004 pigment test method, section 13, oil absorption, section 1, refined linseed oil method JIS K5101-13-2-2004 pigment test method, section 13, oil absorption, section 2, boiled linseed oil method, which widely uses waste edible oil coagulants.
Table 2 comparative results of edible oil and fat setting agent foggy point and setting point elevation tests of examples and comparative examples 1 to 4
Note that: palm oil (palm oil of Jia Li sea of Yihai Jia Li sea with freezing point of 24 deg.C and fog point of 12 deg.C), rice bran oil (palm oil of Yihai Jia Li sea with freezing point of 19 deg.C, fog point of 17 deg.C, acid value of 5.6 mg KOH/g, peroxide value of 2.2 mmol/kg, saponification value of 184.9 mg KOH/g, iodine value of 119.1 g I) 2 100 g self-pressing rice bran oil), peanut oil (Shandong Fu Yikang pressed first-grade peanut oil with a condensation point of 3 ℃ and a fog point of 5 ℃) and edible oil coagulants of examples 1-2 and comparative examples 1-4, wherein the edible oil coagulants account for 4% of the oil content, are respectively added, and are tested according to edible oil condensation point and fog point test standards.
Table 3 results of comparison of the non-flowing setting time test of edible oil setting agent of examples and comparative examples 1 to 4
Note that: palm oil (palm oil of Jia Li sea of Yihai Jia Li sea with freezing point of 24 deg.C and fog point of 12 deg.C), rice bran oil (palm oil of Yihai Jia Li sea with freezing point of 19 deg.C, fog point of 17 deg.C, acid value of 5.6 mg KOH/g, peroxide value of 2.2 mmol/kg, saponification value of 184.9 mg KOH/g, iodine value of 119.1 g I) 2 100/g self-pressing rice bran oil), and edible oil coagulants of examples 1 to 2 and comparative examples 1 to 4, each of which contained 3% of the edible oil coagulants, were added, and were tested.
Claims (2)
1. The preparation method of the zinc oxide waste edible oil coagulant is characterized by comprising the following steps of: (1) Adding 18-20 parts of glycerol into 8-10 parts of zinc acetate solution with the mass fraction of 10% -15%, transferring to a hydrothermal reaction kettle, adding 25-30 parts of zinc nitrate solution with the mass fraction of 8% -10% and 2-4 parts of ion exchange resin 717, placing in the hydrothermal reaction kettle, slowly adding 1-2 parts of template agent polyacrylic acid, uniformly stirring, adding 2-4 parts of gel accelerator propylene oxide, carrying out hydrothermal stirring reaction at 90-95 ℃ for 1-3 hours, and filtering to obtain nano zinc oxide gel; (2) preparation of grafted modified nano zinc oxide gel: adding 18-20 parts of nano zinc oxide gel obtained in the step (1) into 20-30 parts of water, carrying out ultrasonic treatment for 18-20 min, transferring the mixture into another reaction kettle, adding 2-4 parts of dimethyl diallyl ammonium chloride and 0.01-0.05 part of initiator into the reaction kettle at the temperature of 75-80 ℃ and the stirring speed of 300-350 rpm, reacting for 10-15 min, adding 2-4 parts of allyl glycidyl ether and 1-2 parts of cross-linking agent, reacting for 10-15 min, adding 0.8-1 part of allyl glycidyl ether, carrying out heat preservation and stirring for 2-4 h, cooling to room temperature, using hydrochloric acid with the weight fraction of 1.0% to adjust the pH value of a system to 6.8-7.0, transferring the mixture into a shaping mold for gel, washing the mixture with deionized water, and carrying out vacuum freeze drying treatment to obtain grafted modified zinc oxide gel, wherein the cross-linking agent is bis (dioctyloxy pyrophosphate) sodium sulfosuccinate sodium salt of 4- (N-iminomethyl) cyclohexane-1-carboxylic acid sulfosuccinate and N-0.02-isopropyl azomethide hydrochloride, and the azo-2-isopropyl azomethide hydrochloride consists of the mixed salt; (3) Placing the insect white wax, the beeswax and the poly (12-hydroxystearic acid) stearate into an impregnating tank according to the weight ratio of 1-2:2-3:3-4, completely melting the insect white wax and the beeswax into wax crystal liquid at 75-80 ℃, adding the grafted modified zinc oxide gel prepared in the step (2) into the impregnating tank, impregnating the zinc oxide gel by adopting a vacuum impregnation method, sealing a tank cover, starting vacuumizing, wherein the negative pressure in the tank is 0.07-0.08 MPa, vacuumizing for 10-15 min, releasing pressure, filtering, taking out the grafted modified zinc oxide gel impregnated with the wax crystal liquid, cooling the grafted modified zinc oxide gel at 30-35 ℃ for 12-24 h, grinding the grafted modified zinc oxide gel into powder of 500-800 meshes by a ball mill, and obtaining the zinc oxide waste edible oil coagulant.
2. The method for preparing a zinc oxide waste edible oil and fat coagulant according to claim 1, wherein the ball mill in the step (3) is one of a conical ball mill, a superfine lamination ball mill, a ceramic ball mill or a lattice ball mill.
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