CN108704625B - Food drying agent - Google Patents
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- CN108704625B CN108704625B CN201810543634.XA CN201810543634A CN108704625B CN 108704625 B CN108704625 B CN 108704625B CN 201810543634 A CN201810543634 A CN 201810543634A CN 108704625 B CN108704625 B CN 108704625B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28069—Pore volume, e.g. total pore volume, mesopore volume, micropore volume
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/40—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by drying or kilning; Subsequent reconstitution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2257/00—Components to be removed
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Abstract
The invention discloses a food drying agent, and belongs to the field of chemical industry. The preparation method comprises the steps of uniformly mixing the composite moisture absorption component, the electrolyte solution, the gelatin and the water at 20 ℃, heating to 50 ℃, stirring for 2 hours at 300r/min, adding the auxiliary agent and the stabilizing agent, cooling to 25 ℃, adding the mesoporous molecular sieve, mixing and stirring, dispersing for 20 minutes by ultrasonic waves to obtain a dispersion liquid, drying the dispersion liquid in an oven at 100 ℃ for 2 hours, and cooling to room temperature to obtain the food desiccant. The invention solves the problems that the existing food drying agents in the current market have certain toxicity and have over-low drying efficiency.
Description
Technical Field
The invention belongs to the field of chemical industry, and particularly relates to a food drying agent.
Background
Food desiccants are substances which are capable of removing some of the water from a moist material. Such as calcium sulfate and calcium chloride, etc., and dried by combining with water to form a hydrate; physical food desiccants, such as silica gel and activated alumina, are dried by physically adsorbing water. Moisture management is closely related to the yield of the product, and in the case of food products, under proper temperature and humidity, bacteria and mold in the food can grow at an incredible rate, so that the food is spoiled, and the food is affected by moisture and color change. Electronic products are also poor due to metal oxidation caused by excessive humidity. The food desiccant is used to avoid the occurrence of defective products caused by excessive moisture. With the widespread use of food desiccants, the food desiccants are required to have smaller volumes and be better wedged with packaging containers, and the food desiccants are further required to be safe and reliable in the use process and stable in moisture absorption performance, and can be regenerated and repeatedly used.
The food drying agents used at present are mostly prepared by taking silica gel, montmorillonite and quicklime as raw materials, have certain drying effect, but have certain toxicity and the defect of low drying efficiency. Therefore, it is necessary to redesign a food desiccant to overcome the technical defects.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems that the existing food drying agents in the current market have certain toxicity and have too low drying efficiency, the food drying agent is provided.
In order to solve the technical problems, the invention adopts the following technical scheme:
a food desiccant comprises the following components in parts by weight: 15-30 parts of electrolyte solution, 8-13 parts of stabilizer, 5-8 parts of silica gel, 1-3 parts of auxiliary agent and 20-30 parts of water, and is characterized by further comprising 30-50 parts of composite moisture absorption component and 20-30 parts of mesoporous molecular sieve;
the preparation method of the composite moisture absorption component comprises the following steps:
s1, taking peanut shells and bagasse according to a mass ratio of 2: 1, mixing, washing, drying, crushing and sieving, and taking sieved particles according to a mass ratio of 1: 3-4 adding Na2CO3Heating the solution in water bath at 80-90 ℃ for 35-55 min, mixing, stirring, filtering, and taking filter residues according to a mass ratio of 1: 2-3, adding a sulfuric acid solution, stirring in a water bath at the temperature of 60-75 ℃ for 30-40 min, standing for 30-40 min, centrifuging at a high speed, taking the turbid matter on the lower layer, placing the turbid matter in a dialysis bag, dialyzing with deionized water for 3-5 days, taking the dialysate, carrying out ultrasonic treatment in an ice water bath for 30-40 min, and carrying out vacuum freeze drying for 44-48 h to obtain a dried matter;
s2, mixing the following components in a mass ratio of 1: 3-4: 5 mixing the polyimide, the sepiolite and the dried substance, crushing and sieving by a 120-mesh sieve, taking the sieved particles, flatly paving the particles, putting the particles into a vacuum cavity, and filling nitrogen into the vacuum cavity for plasma treatment to obtain the composite moisture absorption component;
the preparation of the mesoporous molecular sieve comprises the following steps: taking 15-20 parts of sodium aluminate, 20-25 parts of sodium hydroxide solution, 7-15 parts of tetraethylammonium hydroxide, 5-10 parts of white carbon black and 3-8 parts of polytetrafluoroethylene, mixing and stirring, heating at 110-120 ℃ for 3-4 hours, adding 4-10 parts of hexadecyl trimethyl ammonium bromide, mixing, adding 3-8 parts of polytetrafluoroethylene, adjusting the pH, continuing stirring for 30-40 min to obtain sol, taking the sol, crystallizing at 100-110 ℃ for 1.5-2 days, taking out crystallized substances, washing, filtering, drying at 100-110 ℃ for 10-12 hours to obtain a semi-finished product, and roasting the semi-finished product at 500-550 ℃ for 5-6 hours to obtain the mesoporous molecular sieve.
The electrolyte solution is prepared from zinc chloride, potassium chloride and water according to a mass ratio of 1: 1: 3-4, and obtaining the electrolyte solution.
The stabilizer is prepared from sodium carboxymethyl starch and carboxymethyl cellulose according to a mass ratio of 1: 1-2, and obtaining the stabilizer.
The auxiliary agent is one or a mixture of bentonite, quartz sand and montmorillonite.
Compared with other methods, the method has the beneficial technical effects that:
the modified cellulose, sepiolite and polyimide are used for plasma treatment, the number of oxygen-containing polar functional groups on the surface is increased, a compact cross-linking layer is formed, and polar groups are introduced, so that the water absorption, the cohesiveness and the biocompatibility of a food desiccant system are improved, the property of a matrix is not influenced, the moisture absorption of the food desiccant system is greatly improved, the network structure of the mesoporous molecular sieve has good thermal stability, the mesoporous molecular sieve can be used as a three-dimensional structure to wrap moisture absorption components, has a buffering effect, avoids expansion after moisture absorption, prolongs the drying effect, and is safe and nontoxic.
Detailed Description
The electrolyte solution is prepared from zinc chloride, potassium chloride and water according to a mass ratio of 1: 1: 3-4, and obtaining the electrolyte solution.
The stabilizer is sodium carboxymethyl starch and carboxymethyl cellulose in a mass ratio of 1: 1-2, and obtaining the stabilizer.
The auxiliary agent is one or a mixture of bentonite, quartz sand and montmorillonite.
The preparation method of the composite moisture absorption component comprises the following steps:
s1, taking peanut shells and bagasse according to a mass ratio of 2: 1, mixing, cleaning, drying at 80-90 ℃, crushing and sieving with a 80-mesh sieve, and taking sieved particles according to a mass ratio of 1: 3-4, adding 5-10 mass percent of Na2CO3Heating the solution in water bath at 80-90 ℃ for 35-55 min,mixing and stirring, filtering, and taking filter residues according to a mass ratio of 1: 2-3, adding a 50-60 mass percent sulfuric acid solution, stirring for 30-40 min in a water bath at 60-75 ℃, standing for 30-40 min, performing centrifugal filtration at 2000-2500 r/min, taking a lower layer turbid substance, placing the turbid substance in a dialysis bag, dialyzing for 3-5 days with deionized water, taking a dialyzate, performing ultrasonic treatment for 30-40 min in an ice water bath, and performing vacuum freeze drying for 44-48 h to obtain a dried substance;
s2, mixing the following components in a mass ratio of 1: 3-4: and 5, mixing the polyimide, the sepiolite and the dried substance, crushing, sieving by a 120-mesh sieve, taking the sieved particles, flatly paving the particles, putting the particles into a vacuum cavity, and filling nitrogen into the vacuum cavity for plasma treatment to obtain the composite moisture absorption component.
Preparation of mesoporous molecular sieve: taking 15-20 parts of sodium aluminate, 20-25 parts of sodium hydroxide solution with the mass fraction of 5-10%, 7-15 parts of tetraethylammonium hydroxide, 5-10 parts of white carbon black and 3-8 parts of polytetrafluoroethylene, mixing and stirring in a reaction kettle, heating at 110-120 ℃ for 3-4 hours, adding 4-10 parts of hexadecyl trimethyl ammonium bromide for mixing, adding 3-8 parts of polytetrafluoroethylene, adjusting the pH value to 10 by using 0.2 mol/L hydrochloric acid, continuously stirring for 30-40 minutes to obtain sol, transferring the sol into a reaction kettle, crystallizing at 100-110 ℃ for 1.5-2 days, taking out a crystallized substance for washing and filtering, drying at 100-110 ℃ for 10-12 hours to obtain a semi-finished product, and roasting the semi-finished product at 500-550 ℃ for 5-6 hours to obtain the mesoporous molecular sieve.
A preparation method of a food desiccant comprises the following steps:
(1) taking 30-50 parts by mass of a composite moisture absorption component, 20-30 parts by mass of a mesoporous molecular sieve, 15-30 parts by mass of an electrolyte solution, 8-13 parts by mass of a stabilizer, 1-3 parts by mass of an auxiliary agent, 5-8 parts by mass of silica gel and 20-30 parts by mass of water;
(2) uniformly mixing the composite moisture absorption component, the electrolyte solution, gelatin and water at 20-25 ℃, heating to 50-60 ℃, stirring for 2-3 h at 300-350 r/min, adding the auxiliary agent and the stabilizing agent, cooling to 25-30 ℃, adding the mesoporous molecular sieve, mixing and stirring, performing ultrasonic dispersion for 20-30 min to obtain a dispersion liquid, taking the dispersion liquid, drying in an oven at 100-110 ℃ for 2-3 h, and cooling to room temperature to obtain the food desiccant.
Example 1
The electrolyte solution is prepared from zinc chloride, potassium chloride and water according to a mass ratio of 1: 1: 3, mixing to obtain the electrolyte solution.
The stabilizer is sodium carboxymethyl starch and carboxymethyl cellulose in a mass ratio of 1: 1, mixing to obtain the stabilizer.
The auxiliary agent is bentonite.
The preparation method of the composite moisture absorption component comprises the following steps:
s1, taking peanut shells and bagasse according to a mass ratio of 2: 1, mixing, cleaning, drying at 80 ℃, crushing and sieving by a 80-mesh sieve, taking sieved particles according to a mass ratio of 1: 3 adding Na with the mass fraction of 5 percent2CO3Heating the solution in water bath at 80 ℃ for 35min, mixing, stirring, filtering, and taking filter residues according to a mass ratio of 1: 2, adding a sulfuric acid solution with the mass fraction of 50%, stirring in a water bath at 60 ℃, standing for 30min, centrifuging and filtering at 2000r/min, taking the turbid matter on the lower layer, putting the turbid matter in a dialysis bag, dialyzing with deionized water for 3 days, taking the dialysate, carrying out ultrasonic treatment in an ice water bath for 30min, and carrying out vacuum freeze drying for 44h to obtain a dried matter;
s2, mixing the following components in a mass ratio of 1: 3: and 5, mixing the polyimide, the sepiolite and the dried substance, crushing, sieving by a 120-mesh sieve, taking the sieved particles, flatly paving the particles, putting the particles into a vacuum cavity, and filling nitrogen into the vacuum cavity for plasma treatment to obtain the composite moisture absorption component.
Preparation of mesoporous molecular sieve: taking 15 parts of sodium aluminate, 20 parts of sodium hydroxide solution with the mass fraction of 5%, 7 parts of tetraethyl ammonium hydroxide, 5 parts of white carbon black and 3 parts of polytetrafluoroethylene, mixing and stirring in a reaction kettle, heating at 110 ℃ for 3 hours, adding 4 parts of hexadecyl trimethyl ammonium bromide, mixing, adding 3 parts of polytetrafluoroethylene, adjusting the pH value to 10 by using 0.2 mol/L hydrochloric acid, continuously stirring for 30 minutes to obtain sol, taking the sol, transferring the sol into the reaction kettle, crystallizing at 100 ℃ for 1.5 days, taking out crystallized substances, washing, filtering, drying at 100 ℃ for 10 hours to obtain a semi-finished product, taking the semi-finished product, and roasting at 500 ℃ for 5 hours to obtain the mesoporous molecular sieve.
A preparation method of a food desiccant comprises the following steps:
(1) according to the mass parts, 30 parts of composite moisture absorption component, 20 parts of mesoporous molecular sieve, 15 parts of electrolyte solution, 8 parts of stabilizer, 1 part of auxiliary agent, 5 parts of silica gel and 20 parts of water are taken;
(2) uniformly mixing the composite moisture absorption component, the electrolyte solution, the gelatin and the water at 20 ℃, heating to 50 ℃, stirring for 2h at 300r/min, adding the auxiliary agent and the stabilizing agent, cooling to 25 ℃, adding the mesoporous molecular sieve, mixing and stirring, performing ultrasonic dispersion for 20min to obtain dispersion, taking the dispersion, drying for 2h in an oven at 100 ℃, and cooling to room temperature to obtain the food desiccant.
Example 2
The electrolyte solution is prepared from zinc chloride, potassium chloride and water according to a mass ratio of 1: 1: 4, mixing to obtain the electrolyte solution.
The stabilizer is sodium carboxymethyl starch and carboxymethyl cellulose in a mass ratio of 1: 2, mixing to obtain the stabilizer.
The auxiliary agent is quartz sand.
The preparation method of the composite moisture absorption component comprises the following steps:
s1, taking peanut shells and bagasse according to a mass ratio of 2: 1, mixing, cleaning, drying at 90 ℃, crushing and sieving by a 80-mesh sieve, taking sieved particles according to a mass ratio of 1: 4 adding Na with the mass fraction of 10 percent2CO3Heating the solution in water bath at 90 ℃ for 55min, mixing, stirring, filtering, and taking filter residues according to a mass ratio of 1: 3 adding a sulfuric acid solution with the mass fraction of 60%, stirring in a water bath at 75 ℃, standing for 40min, centrifuging and filtering at 2500r/min, taking the turbid matter on the lower layer, putting the turbid matter in a dialysis bag, dialyzing with deionized water for 5 days, taking the dialysate, carrying out ultrasonic treatment in an ice water bath for 40min, and carrying out vacuum freeze drying for 48h to obtain a dried matter;
s2, mixing the following components in a mass ratio of 1: 4: and 5, mixing the polyimide, the sepiolite and the dried substance, crushing, sieving by a 120-mesh sieve, taking the sieved particles, flatly paving the particles, putting the particles into a vacuum cavity, and filling nitrogen into the vacuum cavity for plasma treatment to obtain the composite moisture absorption component.
Preparation of mesoporous molecular sieve: according to the mass parts, 20 parts of sodium aluminate, 25 parts of sodium hydroxide solution with the mass fraction of 10%, 15 parts of tetraethylammonium hydroxide, 10 parts of white carbon black and 8 parts of polytetrafluoroethylene are mixed and stirred in a reaction kettle, the mixture is heated at 120 ℃ for 4 hours, 10 parts of hexadecyl trimethyl ammonium bromide are added for mixing, 8 parts of polytetrafluoroethylene are added, the pH value of the mixture is adjusted to 10 by 0.2 mol/L hydrochloric acid, the mixture is continuously stirred for 40 minutes to obtain sol, the sol is taken out and moved into the reaction kettle, crystallized for 2 days at 110 ℃, crystallized substances are taken out for washing and filtering, the mixture is dried at 110 ℃ for 12 hours to obtain a semi-finished product, and the semi-finished product is taken out and roasted at 550 ℃ for 6 hours to obtain the mesoporous molecular sieve.
A preparation method of a food desiccant comprises the following steps:
(1) taking 50 parts of composite moisture absorption component, 30 parts of mesoporous molecular sieve, 30 parts of electrolyte solution, 13 parts of stabilizer, 3 parts of auxiliary agent, 8 parts of silica gel and 30 parts of water in parts by weight;
(2) uniformly mixing the composite moisture absorption component, the electrolyte solution, the gelatin and the water at 25 ℃, heating to 60 ℃, stirring for 3h at 350r/min, adding the auxiliary agent and the stabilizing agent, cooling to 30 ℃, adding the mesoporous molecular sieve, mixing and stirring, performing ultrasonic dispersion for 30min to obtain a dispersion liquid, taking the dispersion liquid, drying for 3h in a drying oven at 110 ℃, and cooling to room temperature to obtain the food desiccant.
Example 3
The electrolyte solution is prepared from zinc chloride, potassium chloride and water according to a mass ratio of 1: 1: 3, mixing to obtain the electrolyte solution.
The stabilizer is sodium carboxymethyl starch and carboxymethyl cellulose in a mass ratio of 1: 2, mixing to obtain the stabilizer.
The assistant is montmorillonite.
The preparation method of the composite moisture absorption component comprises the following steps:
s1, taking peanut shells and bagasse according to a mass ratio of 2: 1, mixing, cleaning, drying at 85 ℃, crushing and sieving by a 80-mesh sieve, taking sieved particles according to a mass ratio of 1: 3 adding Na with the mass fraction of 7 percent2CO3Heating the solution in water bath at 85 ℃ for 45min, mixing, stirring, filtering, and taking filter residues according to a mass ratio of 1: 2, adding a sulfuric acid solution with the mass fraction of 55%, stirring in a water bath at 68 ℃ for 35min, standing for 35min, centrifuging and filtering at 2250r/min, taking the lower layer turbid matter, putting the turbid matter in a dialysis bag, dialyzing with deionized water for 4 days, taking dialysate, carrying out ultrasonic treatment in an ice water bath for 35min, and carrying out vacuum freeze drying for 46h to obtain a dried matter;
s2, mixing the following components in a mass ratio of 1: 3: and 5, mixing the polyimide, the sepiolite and the dried substance, crushing, sieving by a 120-mesh sieve, taking the sieved particles, flatly paving the particles, putting the particles into a vacuum cavity, and filling nitrogen into the vacuum cavity for plasma treatment to obtain the composite moisture absorption component.
Preparation of mesoporous molecular sieve: according to the mass portion, 17 portions of sodium aluminate, 23 portions of 7% sodium hydroxide solution, 11 portions of tetraethyl ammonium hydroxide, 7 portions of white carbon black and 5 portions of polytetrafluoroethylene are mixed and stirred in a reaction kettle, the mixture is heated at 115 ℃ for 3 hours, 7 portions of hexadecyl trimethyl ammonium bromide are added and mixed, 5 portions of polytetrafluoroethylene are added, the pH value of the mixture is adjusted to 10 by 0.2 mol/L hydrochloric acid, the mixture is continuously stirred for 35 minutes to obtain sol, the sol is moved into the reaction kettle, crystallized for 2 days at 105 ℃, crystallized substances are taken out and washed and filtered, the mixture is dried for 11 hours at 105 ℃ to obtain a semi-finished product, and the semi-finished product is roasted for 5 hours at 525 ℃ to obtain the mesoporous molecular sieve.
A preparation method of a food desiccant comprises the following steps:
(1) taking 40 parts of composite moisture absorption component, 25 parts of mesoporous molecular sieve, 22 parts of electrolyte solution, 11 parts of stabilizer, 2 parts of auxiliary agent, 7 parts of silica gel and 25 parts of water in parts by weight;
(2) uniformly mixing the composite moisture absorption component, the electrolyte solution, the gelatin and the water at 23 ℃, heating to 55 ℃, stirring for 2h at 325r/min, adding the auxiliary agent and the stabilizing agent, cooling to 27 ℃, adding the mesoporous molecular sieve, mixing and stirring, performing ultrasonic dispersion for 25min to obtain dispersion, taking the dispersion, drying for 2h in an oven at 105 ℃, and cooling to room temperature to obtain the food desiccant.
Comparative example 1: the preparation was essentially the same as in example 1, except that the composite hygroscopic component was absent.
Comparative example 2: the preparation method is basically the same as that of example 1, except that the mesoporous molecular sieve is absent.
Comparative example 3: a food desiccant manufactured by a company in the city of Xian.
The food desiccants obtained in the above examples were tested against comparative food desiccants, see GB7823-87 and GB 6284-86. The moisture absorption capacities of the food desiccants obtained in examples and the comparative food desiccants were respectively tested at different humidities after first establishing closed systems of different relative humidities at 25 c, and the water absorption rates thereof were calculated according to the formula and compared to conclude as in table 1.
The water absorption calculation formula is as follows: w ═ mb-mg/mg × 100% mb-mass mg of material in saturated state of water absorption-mass of material in dry state
Table 1:
and (3) safety testing: the food desiccant prepared in the above example was used to gavage the mouse at a dose of 0.2mg/10g once a day, and 21 days later, it was found that the mouse was normal in activity, and had normal food intake twice. Indicating that the product of the invention is a non-toxic or low-toxic agent.
In conclusion, the food desiccant has better effect and is worthy of popularization and application.
Claims (2)
1. A food desiccant comprises the following components in parts by weight: 15-30 parts of electrolyte solution, 8-13 parts of stabilizer, 5-8 parts of silica gel, 1-3 parts of auxiliary agent and 20-30 parts of water, and is characterized by further comprising 30-50 parts of composite moisture absorption component and 20-30 parts of mesoporous molecular sieve;
the preparation method of the composite moisture absorption component comprises the following steps:
s1, taking peanut shells and bagasse according to a mass ratio of 2: 1, mixing, washing, drying, crushing and sieving, and taking sieved particles according to a mass ratio of 1: 3-4 adding Na2CO3Heating the solution in water bath at 80-90 ℃ for 35-55 min, mixing, stirring, filtering, and taking filter residues according to a mass ratio of 1: 2-3, adding a sulfuric acid solution, stirring in a water bath at the temperature of 60-75 ℃ for 30-40 min, standing for 30-40 min, centrifuging at a high speed, taking the turbid matter on the lower layer, placing the turbid matter in a dialysis bag, dialyzing with deionized water for 3-5 days, taking the dialysate, carrying out ultrasonic treatment in an ice water bath for 30-40 min, and carrying out vacuum freeze drying for 44-48 h to obtain a dried matter;
s2, mixing the following components in a mass ratio of 1: 3-4: 5 mixing the polyimide, the sepiolite and the dried substance, crushing and sieving by a 120-mesh sieve, taking the sieved particles, flatly paving the particles, putting the particles into a vacuum cavity, and filling nitrogen into the vacuum cavity for plasma treatment to obtain the composite moisture absorption component;
the preparation of the mesoporous molecular sieve comprises the following steps: taking 15-20 parts of sodium aluminate, 20-25 parts of sodium hydroxide solution, 7-15 parts of tetraethylammonium hydroxide, 5-10 parts of white carbon black and 3-8 parts of polytetrafluoroethylene, mixing and stirring, heating at 110-120 ℃ for 3-4 hours, adding 4-10 parts of hexadecyl trimethyl ammonium bromide, mixing, adding 3-8 parts of polytetrafluoroethylene, adjusting the pH, continuing stirring for 30-40 min to obtain sol, taking the sol, crystallizing at 100-110 ℃ for 1.5-2 days, taking out crystallized substances, washing, filtering, drying at 100-110 ℃ for 10-12 hours to obtain a semi-finished product, roasting the semi-finished product at 500-550 ℃ for 5-6 hours to obtain a mesoporous molecular sieve;
the stabilizer is prepared from sodium carboxymethyl starch and carboxymethyl cellulose according to a mass ratio of 1: 1-2, and obtaining a stabilizer;
the auxiliary agent is one or a mixture of bentonite, quartz sand and montmorillonite;
a preparation method of a food desiccant comprises the following steps:
(1) taking 30-50 parts by mass of a composite moisture absorption component, 20-30 parts by mass of a mesoporous molecular sieve, 15-30 parts by mass of an electrolyte solution, 8-13 parts by mass of a stabilizer, 1-3 parts by mass of an auxiliary agent, 5-8 parts by mass of silica gel and 20-30 parts by mass of water;
(2) uniformly mixing the composite moisture absorption component, the electrolyte solution, gelatin and water at 20-25 ℃, heating to 50-60 ℃, stirring for 2-3 h at 300-350 r/min, adding the auxiliary agent and the stabilizing agent, cooling to 25-30 ℃, adding the mesoporous molecular sieve, mixing and stirring, performing ultrasonic dispersion for 20-30 min to obtain a dispersion liquid, taking the dispersion liquid, drying in an oven at 100-110 ℃ for 2-3 h, and cooling to room temperature to obtain the food desiccant.
2. The food desiccant as claimed in claim 1, wherein the electrolyte solution is zinc chloride, potassium chloride and water in a mass ratio of 1: 1: 3-4, and obtaining the electrolyte solution.
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| CN114602428B (en) * | 2022-03-31 | 2023-08-29 | 干将新材料有限公司 | High-temperature-resistant long-aging drying agent and preparation method and application thereof |
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