Food deoxidizer and preparation method thereof

Abstract

The invention relates to the technical field of food preservation, in particular to a food deoxidizer and a preparation method thereof, and the food deoxidizer comprises a packaging bag and a deoxidizer; the packaging bag is designed into two layers and comprises an outer-layer packaging bag body and an inner-layer packaging bag body, the outer-layer packaging bag body mainly comprises a polyvinyl alcohol material, and the inner-layer packaging bag body mainly comprises 5%-10% of polyolefin, 3%-5% of plasticizer and 0.5%-1% of antioxidant. According to the scheme, the outer-layer packaging bag is made of the specific modified polyvinyl alcohol high polymer material which has certain permeability to sodium ions and is low in speed, so that a large number of sodium ions which can quickly penetrate through the outer-layer packaging bag do not exist in the outside world when the outer-layer packaging bag is not in contact with food in a natural environment; the outer layer bag can effectively prevent external oxygen, moisture and the like from being in contact with the inner layer material and the deoxidizing agent, the deoxidization reaction is prevented from being caused, in the natural environment, the key starting substance of food salt is lacked, and a subsequent reaction chain cannot be started, so that the deoxidizing agent cannot be subjected to the deoxidization reaction in the natural environment.

Description

Technical Field

[0001] The present invention relates to the technical field of food preservation, and in particular to a food deoxidizer and a preparation method thereof. Background Art

[0002] Food deoxidizer is a substance commonly used in the field of food preservation. Its main function is to absorb oxygen in the package through chemical reactions, thereby extending the shelf life of food.

[0003] Traditional food deoxidizers usually use a simple packaging structure and a single deoxidizer component combination. Common packaging materials may not be able to effectively prevent external moisture and oxygen from contacting the deoxidizer when not in use, which can easily cause the deoxidizer to fail prematurely or cause unnecessary reactions during storage, affecting its actual use effect.

[0004] To this end, the present invention proposes a food deoxidizer and a preparation method thereof. By designing a double-layer packaging bag, after contacting with food, the salt in the food is used to initiate a high-efficiency deoxidation reaction, thereby effectively blocking external adverse factors in a natural environment and avoiding premature deoxidation reaction, thereby greatly improving the stability, reliability and preservation effect of the food deoxidizer, and bringing a new breakthrough in food preservation technology. Summary of the invention

[0005] Technical problem to be solved: The problem of being difficult to store in natural environment.

[0006] In view of the deficiencies in the prior art, the present invention provides a food deoxidizer and a preparation method thereof, thereby solving the technical problems mentioned in the background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A food deoxidizer, comprising a packaging bag and a deoxidizer;

[0009] The packaging bag is designed to be double-layered, including an outer packaging bag and an inner packaging bag, the outer packaging bag mainly includes polyvinyl alcohol material, and the inner packaging bag mainly includes 5%-10% polyolefin, 3%-5% plasticizer, and 0.5%-1% antioxidant;

[0010] The deoxidizer includes iron powder, activated carbon, sodium chloride and water in a ratio of 80:10:5:5.

[0011] In a possible implementation, the outer packaging bag is prepared by the following method steps:

[0012] Step 1: Raw material pretreatment, drying the selected polyvinyl alcohol raw material;

[0013] Step 2: Film making, heating and melting the dried polyvinyl alcohol raw material, and making a polyvinyl alcohol film through a casting machine;

[0014] Step 3: Surface treatment: treating the surface of the polyvinyl alcohol film by corona treatment.

[0015] In a possible implementation, the inner packaging bag is prepared by the following method steps:

[0016] Step 1: Mixing the raw materials: uniformly mixing the polyolefin raw material containing ferrous salt with an appropriate amount of plasticizer and antioxidant in a high-speed mixer according to a certain proportion;

[0017] Step 2: Film making: After the mixed raw materials are melted, a polyolefin film containing ferrous salt is made by a casting method.

[0018] In a possible implementation, a method for preparing a food deoxidizer is applied to the above-mentioned food deoxidizer, comprising the following method steps:

[0019] S1: Compounding, compounding the prepared inner packaging bag and the outer packaging bag through a dry compounding process;

[0020] S2: Mixing: fully mix iron powder: activated carbon: sodium chloride: water according to the proportion;

[0021] S3: Humidification: slowly add a certain amount of water to the mixed material, stirring while adding water to make the water evenly distributed in the material;

[0022] S4: Packaging: putting the prepared deoxidizer into the compounded double-layer packaging bag and heat-sealing it.

[0023] Beneficial effects compared with the prior art:

[0024] 1. In this solution, the outer packaging bag adopts a specially modified polyvinyl alcohol polymer material that has a certain permeability to sodium ions but at a slow rate. In the natural environment, when there is no contact with food, there is no large amount of sodium ions in the outside world that can quickly pass through the outer bag, and the outer bag can effectively prevent external oxygen, moisture, etc. from contacting the inner material and deoxidizer, avoiding the initiation of deoxidation reaction;

[0025] 2. In this scheme, the deoxygenation reaction is initiated by the salt (sodium ions) in the food being precipitated from the outer layer, reacting with the polymer containing ferrous salt in the inner layer to generate intermediate products (sodium sulfate and ferrous ions). The intermediate products (ferrous ions) then react with the iron powder in the deoxidizer to absorb oxygen. In the natural environment, the subsequent reaction chain cannot be started due to the lack of food salt, a key starting substance, so the deoxidizer will not undergo a deoxygenation reaction in the natural environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of a food deoxidizer. DETAILED DESCRIPTION

[0028] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various forms, so the present invention is not limited to the embodiments described below.

[0029] The technical solution in the embodiment of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0030] Embodiment 1:

[0031] Please refer to Figure 1 As shown, this embodiment introduces a food deoxidizer, including a packaging bag and a deoxidizer, and the packaging bag is designed to be double-layered, including an outer packaging bag and an inner packaging bag;

[0032] The outer packaging bag mainly includes polyvinyl alcohol (PVA);

[0033] The inner packaging bag mainly includes 5%-10% polyolefin, 3%-5% plasticizer, and 0.5%-1% antioxidant;

[0034] The deoxidizer includes iron powder, activated carbon, sodium chloride and water, and the ratio is iron powder: activated carbon: sodium chloride: water = 80:10:5:5;

[0035] Embodiment 2:

[0036] Please refer to Figure 1 As shown, this embodiment introduces a preparation process of a food deoxidizer, and the specific steps are as follows:

[0037] 1. Material preparation

[0038] 1.1. Outer packaging bag material: Choose polymer materials that have a certain degree of permeability to sodium ions, such as specially modified polyvinyl alcohol (PVA). PVA has good film-forming properties and a certain degree of ion permeability. It also has good barrier properties and can prevent external moisture and oxygen from entering the packaging and affecting food.

[0039] 1.2. Inner packaging bag material: Select materials that combine well with the outer layer material and can react with sodium ions, such as polymers containing specific metal salts. For example, polyolefin materials containing ferrous salts can be selected. The ferrous salts can be evenly dispersed in the polyolefin matrix by blending. The ferrous salts can react with the sodium ions that penetrate from the outer layer by ion exchange and other reactions;

[0040] 1.3. Deoxidizer ingredients: The deoxidizer ingredients are common and safe iron powder, and appropriate amounts of activated carbon, sodium chloride and water are added as auxiliary ingredients. Activated carbon has good adsorption properties, which can increase the reaction surface area and accelerate the reaction; sodium chloride, as an electrolyte, can promote the oxygen absorption and corrosion reaction of iron powder; appropriate amount of water is a necessary condition for the reaction;

[0041] 2. Preparation of outer packaging bag

[0042] Raw material pretreatment: Dry the selected PVA raw materials to remove moisture to ensure the film quality. The drying condition is to dry them in an oven at 60-80℃ for 4-6 hours.

[0043] Film making: Film making is carried out by casting or blowing. Taking casting as an example, the dried PVA raw material is heated to 180-200°C to melt it, and then the melt is evenly cast on a cooling drum by a casting machine, cooled and formed to obtain a PVA film with a thickness of 0.05-0.1mm;

[0044] Surface treatment: In order to enhance the bonding strength with the inner packaging bag, the surface of the PVA film is subjected to corona treatment or plasma treatment, with a corona voltage of 3-5kV, a frequency of 10-20kHz, and a treatment time of 1-2min;

[0045] 3. Preparation of inner packaging bag

[0046] Raw material mixing: polyolefin raw material containing ferrous salt (specifically ferrous sulfate) is uniformly mixed with appropriate amounts of plasticizer and antioxidant in a high-speed mixer in a certain proportion, wherein the ferrous salt content is 5%-10% of the mass of the polyolefin, the plasticizer content is 3%-5%, and the antioxidant content is 0.5%-1%.

[0047] Film making: The film is made by the casting method, the mixed raw materials are heated to 160-180℃ to melt, cast and cooled to form, and a polyolefin film containing ferrous salt with a thickness of 0.08-0.12mm is obtained;

[0048] Composite: The prepared inner film and the surface treated outer film are composited by dry composite process, using polyurethane adhesive, and the amount of glue is controlled at 3-5g / m 2The composite pressure is 0.2-0.3MPa, the composite temperature is 50-60℃, and the composite is subjected to aging treatment at 40-50℃ for 24-48 hours to fully cure the adhesive and enhance the bonding strength of the two films.

[0049] 4. Preparation of deoxidizer

[0050] Ingredients: weigh each ingredient according to the mass ratio of iron powder: activated carbon: sodium chloride: water = 80:10:5:5;

[0051] Mixing: Mix the weighed iron powder, activated carbon and sodium chloride in a three-dimensional mixer for 30-60 minutes to ensure that the ingredients are evenly distributed;

[0052] Humidification: slowly add a certain amount of water to the mixed material, stirring while adding water to make the water evenly distributed in the material;

[0053] Packaging: Put the prepared deoxidizer into the compounded double-layer packaging bag, heat-seal the packaging, and ensure that the packaging is well sealed to prevent outside air from entering;

[0054] 5. Quality inspection

[0055] 5.1. Performance test of deoxidizer: Put the packaging bag containing deoxidizer into a sealed container containing a certain amount of oxygen, store it under different temperature and humidity conditions, regularly test the oxygen content in the container, evaluate the deoxidation capacity and reaction rate of the deoxidizer, and require that the oxygen content in the container can be reduced to below 0.1% within the specified time;

[0056] The specific chemical formula of the deoxygenation reaction is as follows:

[0057] 5.1.1. Sodium ions react with ferrous sulfate in the inner layer material

[0058] When the sodium ions (Na + ) comes into contact with ferrous sulfate (FeSO4), an ion exchange reaction may occur to generate sodium sulfate (Na2SO4) and ferrous ions (Fe 2+ ), 2Na + +FeSO4→Na2SO4+Fe 2+ ;

[0059] 5.1.2. Generation of ferrous ions (Fe 2+ ) after which ferrous ions (Fe 2+ ) reacts with oxygen (O2) and water (H2O) to generate Fe(OH)3, 4Fe 2+ +O2+10H2O→4Fe(OH)3+8H +At the same time, iron powder (Fe) will also participate in the oxygen absorption corrosion reaction, 4Fe+3O2+6H2O→4Fe(OH)3;

[0060] 5.2. Safety testing: Carry out migration test on the prepared deoxidizer and packaging bags to detect whether any harmful substances migrate into the food simulant. The standard method for migration test of food contact materials is adopted. The packaging bags are contacted with food simulants (such as 4% acetic acid, 10% ethanol, etc.) under specified conditions for a certain period of time, and then the simulants are analyzed by instruments such as gas chromatography-mass spectrometry (GC-MS) to determine whether there are any harmful substances in the simulants.

[0061] Comparative Example 1:

[0062] 1. Preparation of outer packaging bag

[0063] Raw material pretreatment: Dry the selected PVA raw materials to remove moisture to ensure the film quality. The drying condition is to dry them in an oven at 60-80℃ for 4-6 hours.

[0064] Film making: Film making is carried out by casting or blowing. Taking casting as an example, the dried PVA raw material is heated to 180-200°C to melt it, and then the melt is evenly cast on a cooling drum by a casting machine, cooled and formed to obtain a PVA film with a thickness of 0.05-0.1mm;

[0065] Surface treatment: In order to enhance the bonding strength with the inner packaging bag, the surface of the PVA film is subjected to corona treatment or plasma treatment, with a corona voltage of 3-5kV, a frequency of 10-20kHz, and a treatment time of 1-2min;

[0066] 2. Preparation of inner packaging bag

[0067] Raw material mixing: polyolefin raw material containing ferrous salt (specifically ferrous sulfate) is uniformly mixed with appropriate amounts of plasticizer and antioxidant in a high-speed mixer in a certain proportion, wherein the ferrous salt content is 5%-10% of the mass of the polyolefin, the plasticizer content is 3%-5%, and the antioxidant content is 0.5%-1%.

[0068] Film making: The film is made by the casting method, the mixed raw materials are heated to 160-180℃ to melt, cast and cooled to form, and a polyolefin film containing ferrous salt with a thickness of 0.08-0.12mm is obtained;

[0069] Composite: The prepared inner film and the surface treated outer film are composited by dry composite process, using polyurethane adhesive, and the amount of glue is controlled at 3-5g / m 2The composite pressure is 0.2-0.3MPa, the composite temperature is 50-60℃, and the composite is subjected to aging treatment at 40-50℃ for 24-48 hours to fully cure the adhesive and enhance the bonding strength of the two films.

[0070] 3. Preparation of deoxidizer

[0071] Ingredients: iron powder 75%, activated carbon 5%, sodium chloride 8%, diatomaceous earth 10%, organic corrosion inhibitor 2%;

[0072] Preparation: Add the raw materials into a three-dimensional mixer and mix at 100-150 rpm for 45 minutes. The packaging process is also carried out in an environment with a relative humidity of ≤30%, and is packaged in a moisture-proof and oxygen-proof aluminum-plastic composite bag with a heat-sealing temperature of 180-200°C and a heat-sealing time of 3-5 seconds;

[0073] Packaging: Put the prepared deoxidizer into the compounded double-layer packaging bag and heat-seal it to ensure that the packaging is well sealed to prevent outside air from entering.

[0074] Comparative Example 2:

[0075] 1. Preparation of outer packaging bag

[0076] Raw material pretreatment: Dry the selected PVA raw materials to remove moisture to ensure the film quality. The drying condition is to dry them in an oven at 60-80℃ for 4-6 hours.

[0077] Film making: Film making is carried out by casting or blowing. Taking casting as an example, the dried PVA raw material is heated to 180-200°C to melt it, and then the melt is evenly cast on a cooling drum by a casting machine, cooled and formed to obtain a PVA film with a thickness of 0.05-0.1mm;

[0078] Surface treatment: In order to enhance the bonding strength with the inner packaging bag, the surface of the PVA film is subjected to corona treatment or plasma treatment, with a corona voltage of 3-5kV, a frequency of 10-20kHz, and a treatment time of 1-2min;

[0079] 2. Preparation of inner packaging bag

[0080] Raw material mixing: polyolefin resin and ferrous oxalate are mixed in a mass ratio of 95:10, and appropriate amounts of plasticizer (accounting for 5% of the mass of the polyolefin resin) and antioxidant (accounting for 1% of the mass of the polyolefin resin) are added, and mixed in a high-speed mixer at 800-1000 rpm for 10-15 minutes.

[0081] Film making: Using the casting method, the mixed raw materials are heated to 160-180℃ for melting, and cast on a cooling drum at 15-25℃ at a speed of 0.5-1.0m / min to make a film with a thickness of 0.08-0.12mm;

[0082] Composite: Composite with the treated outer PVA film through dry composite process, with a coating amount of 3-5g / m 2 , compound pressure 0.2-0.3MPa, compound temperature 50-60℃, aging 24-48 hours;

[0083] 3. Preparation of deoxidizer

[0084] Ingredients: weigh each ingredient according to the mass ratio of iron powder: activated carbon: sodium chloride: water = 80:10:5:5;

[0085] Mixing: Mix the weighed iron powder, activated carbon and sodium chloride in a three-dimensional mixer for 30-60 minutes to ensure that the ingredients are evenly distributed;

[0086] Humidification: slowly add a certain amount of water to the mixed material, stirring while adding water to make the water evenly distributed in the material;

[0087] Packaging: Put the prepared deoxidizer into the compounded double-layer packaging bag, heat-seal the packaging, and ensure that the packaging is well sealed to prevent outside air.

[0088] Comparative Example 3:

[0089] 1. Preparation of outer packaging bag

[0090] Raw material pretreatment: Dry polyvinylidene chloride (PVDC) in an oven at 80-100°C for 3-4 hours;

[0091] Film making: Using the blow molding method, the dried PVDC raw material is heated to 170-190℃ to melt, and then blown into a film with a thickness of 0.05-0.1mm;

[0092] Surface treatment: corona treatment of the film surface, voltage 3-5kV, frequency 10-20kHz, treatment time 1-2min;

[0093] 2. Preparation of inner packaging bag

[0094] Raw material mixing: polyolefin raw material containing ferrous salt (specifically ferrous sulfate) is uniformly mixed with appropriate amounts of plasticizer and antioxidant in a high-speed mixer in a certain proportion, wherein the ferrous salt content is 5%-10% of the mass of the polyolefin, the plasticizer content is 3%-5%, and the antioxidant content is 0.5%-1%.

[0095] Film making: The film is made by the casting method, the mixed raw materials are heated to 160-180℃ to melt, cast and cooled to form, and a polyolefin film containing ferrous salt with a thickness of 0.08-0.12mm is obtained;

[0096] Composite: The prepared inner film and the surface treated outer film are composited by dry composite process, using polyurethane adhesive, and the amount of glue is controlled at 3-5g / m 2 The composite pressure is 0.2-0.3MPa, the composite temperature is 50-60℃, and the composite is subjected to aging treatment at 40-50℃ for 24-48 hours to fully cure the adhesive and enhance the bonding strength of the two films.

[0097] 3. Preparation of deoxidizer

[0098] Ingredients: weigh each ingredient according to the mass ratio of iron powder: activated carbon: sodium chloride: water = 80:10:5:5;

[0099] Mixing: Mix the weighed iron powder, activated carbon and sodium chloride in a three-dimensional mixer for 30-60 minutes to ensure that the ingredients are evenly distributed;

[0100] Humidification: slowly add a certain amount of water to the mixed material, stirring while adding water to make the water evenly distributed in the material;

[0101] Packaging: Put the prepared deoxidizer into the compounded double-layer packaging bag, heat-seal the packaging, and ensure that the packaging is well sealed to prevent outside air.

[0102] Comparative experiment:

[0103] Deoxidizers and packaging bags were prepared according to the preparation methods of Example 1 and Comparative Examples 1-3.

[0104] 1. Deoxidation performance test

[0105] Place the prepared packaging bags containing deoxidizers in each group into a sealed container containing the same initial amount of oxygen, store under set temperature (e.g., 25°C) and humidity (e.g., 75% RH), regularly (e.g., every 24 hours) use an oxygen content detection device to detect the oxygen content in the container, record the data and draw a curve of oxygen content change over time until the oxygen content is stable or reaches the specified test time;

[0106] 2. Security Testing

[0107] Using the standard method for migration test of food contact materials, each group of packaging bags was contacted with food simulants (4% acetic acid, 10% ethanol, etc.) under specified conditions (temperature, time). After the contact, gas chromatography-mass spectrometry (GC-MS) was used to analyze whether there were harmful substances in the food simulants, and the test results were recorded;

[0108] 3. Stability test

[0109] Some of the prepared deoxidizer samples are stored under different environmental conditions (high temperature and high humidity, low temperature and low humidity, etc.) for a certain period of time (e.g., 1 month). After the storage, their deoxidation performance and safety are tested again, and compared with the initial test results to evaluate the stability;

[0110] 4. Experimental results and analysis

[0111] Table 1: Deoxidizer comprehensive performance test data table

[0112]

[0113] From the experimental results, Example 1 performs well in deoxygenation capacity, and its oxygen content decreases at a fast rate, and can reduce the oxygen content to an extremely low level within the specified time. In contrast, the deoxygenation effects of Comparative Examples 1, 2, and 3 are inferior to varying degrees. In terms of safety, no harmful substance migration was detected in Example 1, while a certain amount of migration occurred in some comparative examples, posing potential food safety risks. In terms of stability, Example 1 is less affected by the environment, and the deoxygenation capacity and safety change rate are within an acceptable range, while the comparative examples have poor stability under high temperature and high humidity environments, and the deoxygenation capacity is greatly reduced and may cause safety problems, which fully demonstrates the advantages of Example 1 of the present invention and provides a more reliable deoxidizer solution for food preservation.

[0114] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A food deoxidizer, characterized in that: Including packaging bags and deoxidizer; The packaging bag is designed to be double-layered, including an outer packaging bag and an inner packaging bag, the outer packaging bag mainly includes polyvinyl alcohol material, and the inner packaging bag mainly includes 5%-10% polyolefin, 3%-5% plasticizer, and 0.5%-1% antioxidant; The deoxidizer includes iron powder, activated carbon, sodium chloride and water in a ratio of 80:10:5:

5.

2. A food deoxidizer as claimed in claim 1, characterized in that, The outer packaging bag is prepared by the following method steps: Step 1: Raw material pretreatment, drying the selected polyvinyl alcohol raw material; Step 2: Film making, heating and melting the dried polyvinyl alcohol raw material, and making a polyvinyl alcohol film through a casting machine; Step 3: Surface treatment: treating the surface of the polyvinyl alcohol film by corona treatment.

3. A food deoxidizer as claimed in claim 1, characterized in that, The inner packaging bag is prepared by the following steps: Step 1: Mixing the raw materials: uniformly mixing the polyolefin raw material containing ferrous salt with an appropriate amount of plasticizer and antioxidant in a high-speed mixer according to a certain proportion; Step 2: Film making: After the mixed raw materials are melted, a polyolefin film containing ferrous salt is made by a casting method.

4. A method for preparing a food deoxidizer, characterized in that: A food deoxidizer applied to any one of claims 1 to 3, comprising the following steps: S1: Compounding, compounding the prepared inner packaging bag and the outer packaging bag through a dry compounding process; S2: Mixing: fully mix iron powder: activated carbon: sodium chloride: water according to the proportion; S3: Humidification: slowly add a certain amount of water to the mixed material, stirring while adding water to make the water evenly distributed in the material; S4: Packaging: putting the prepared deoxidizer into the compounded double-layer packaging bag and heat-sealing it.

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