CN110746677A - Processing method of grain packaging bag - Google Patents

Processing method of grain packaging bag Download PDF

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Publication number
CN110746677A
CN110746677A CN201911092641.3A CN201911092641A CN110746677A CN 110746677 A CN110746677 A CN 110746677A CN 201911092641 A CN201911092641 A CN 201911092641A CN 110746677 A CN110746677 A CN 110746677A
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Prior art keywords
parts
packaging bag
stone needle
nano
powder
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CN201911092641.3A
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Chinese (zh)
Inventor
肖和功
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JIESHOU JIABAO PACKAGING MATERIALS Co Ltd
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JIESHOU JIABAO PACKAGING MATERIALS Co Ltd
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Priority to CN201911092641.3A priority Critical patent/CN110746677A/en
Publication of CN110746677A publication Critical patent/CN110746677A/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0806—Silver
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/16—Applications used for films

Abstract

The invention discloses a processing method of a grain packaging bag, which comprises the following steps: s1, carrying out surface treatment on the nano stone needle powder; s2, preparing mixed powder; s3, weighing the materials; s4, preparing a finished product packaging bag. The invention provides a processing and preparation method of a packaging bag, which has reasonable matching of all process steps and convenient popularization and application, and the prepared packaging bag has good moisture-proof and antibacterial capabilities, can effectively improve the environment in the packaging bag, is beneficial to the storage of grain food, and obviously prolongs the shelf life of the packaging bag.

Description

Processing method of grain packaging bag
Technical Field
The invention belongs to the technical field of food packaging bag processing, and particularly relates to a processing method of a grain packaging bag.
Background
Cereal packaging bags are, as their name implies, food bags for cereal packaging. Such bags are generally required to have good moisture and mildew resistance properties to ensure storage stability and quality of the cereal. However, the existing packaging bags are common in the performance, and the quality of food can be guaranteed only by matching with a large amount of moisture-proof agents and the like, so that the mode not only improves the production cost, but also easily causes the phenomena of mistaken eating and the like, and needs to be continuously improved.
Disclosure of Invention
The invention aims to provide a processing method of a grain packaging bag aiming at the existing problems.
The invention is realized by the following technical scheme:
a processing method of a grain packaging bag comprises the following steps:
s1, firstly, putting the nano stone needle powder into a hydrogen peroxide solution for soaking for 20-25 min, taking out the nano stone needle powder after the soaking for one time by using deionized water, finally, soaking the nano stone needle powder into a silane coupling agent solution for soaking for 35-40 min, and taking out the nano stone needle powder and drying the nano stone needle powder for 1-1.5 h for later use;
s2, immersing graphite powder and the nano stone needle powder processed in the step S1 into a modification liquid together, heating to keep the temperature of the modification liquid at 65-70 ℃, stirring at a high speed for 2-2.5 h, and filtering to obtain mixed powder for later use;
s3, weighing the following substances in parts by weight for later use: 80-85 parts of polyethylene, 15-20 parts of polypropylene, 7-10 parts of the mixed powder prepared in the step S2, 1-2 parts of an antibacterial agent, 2-3 parts of zinc ricinoleate, 1-3 parts of emulsified silicone oil, 2-4 parts of glyceryl monostearate and 1-2 parts of paraffin oil;
and S4, mixing, extruding, cooling, drying and granulating all the substances weighed in the step S3 together, and then preparing the finished product packaging bag by a conventional film blowing process.
Further, the particle size of the nano stone needle powder in the step S1 is 20-60 nm; the volume fraction of hydrogen peroxide in the hydrogen peroxide solution is 8-10%; the mass fraction of the silane coupling agent in the silane coupling agent solution is 10-15%.
Further, the silane coupling agent is a silane coupling agent kh 550.
Further, the weight ratio of the graphite powder in the step S2, the nano stone needle powder treated in the step S1 and the modification liquid is 20-25: 4-6: 200-240; the modifying solution comprises the following components in parts by weight: 10-15 parts of dodecyl trimethyl ammonium bromide, 4-7 parts of sodium hexametaphosphate, 1-3 parts of lanthanum nitrate, 2-5 parts of zinc chloride, 3-6 parts of disodium magnesium ethylene diamine tetraacetate, 8-10 parts of nonylphenol polyoxyethylene ether and 300-330 parts of deionized water; and the rotating speed of stirring is controlled to be 1800-2000 r/min during high-speed stirring treatment.
Further, the antibacterial agent in step S3 is nano silver and nano titanium dioxide, which are mixed according to a weight ratio of 1: 3, and mixing.
The invention optimizes and improves the preparation method of the grain packaging bag, wherein the traditional and commonly used materials such as polyethylene, polypropylene and the like are still used as main raw material components, then a mixed powder component is specially added, the mixed powder is a mixed material compounded by taking graphite powder as a matrix substance and treated nano stone needle powder as a filling carrier, the added nano stone needle powder is nano particles and simultaneously has a special energy field to release negative oxygen ions, can play effectual suppression and kill the effect to mould etc. and cooperate the antiseptic to promote the cleanliness factor in the wrapping bag, it is internal that the nanometer stone needle powder after handling in addition can also effectually insert to be fixed in graphite powder, can promote holistic specific surface area and adsorption efficiency on the one hand, and on the other hand can also strengthen holistic solid locking ability to oxygen etc. has reduced the oxygen content in the bag, and it is long when having promoted the save of cereal. Finally, the packaging bag is prepared by mixing the raw materials with the rest materials by a conventional method, and has good use performance.
Compared with the prior art, the invention has the following advantages:
the invention provides a processing and preparation method of a packaging bag, which has reasonable matching of all process steps and convenient popularization and application, and the prepared packaging bag has good moisture-proof and antibacterial capabilities, can effectively improve the environment in the packaging bag, is beneficial to the storage of grain food, and obviously prolongs the shelf life of the packaging bag.
Drawings
FIG. 1 is a graph showing the change in volume fraction of oxygen in each set of bags.
Fig. 2 is a graph showing the change in volume fraction of carbon dioxide in each set of bags.
FIG. 3 is a graph showing the change in lipase activity in each set of bags.
Detailed Description
The present invention will be described in further detail with reference to examples.
A processing method of a grain packaging bag comprises the following steps:
s1, firstly, putting the nano stone needle powder into a hydrogen peroxide solution for soaking for 20-25 min, taking out the nano stone needle powder after the soaking for one time by using deionized water, finally, soaking the nano stone needle powder into a silane coupling agent solution for soaking for 35-40 min, and taking out the nano stone needle powder and drying the nano stone needle powder for 1-1.5 h for later use;
s2, immersing graphite powder and the nano stone needle powder processed in the step S1 into a modification liquid together, heating to keep the temperature of the modification liquid at 65-70 ℃, stirring at a high speed for 2-2.5 h, and filtering to obtain mixed powder for later use;
s3, weighing the following substances in parts by weight for later use: 80-85 parts of polyethylene, 15-20 parts of polypropylene, 7-10 parts of the mixed powder prepared in the step S2, 1-2 parts of an antibacterial agent, 2-3 parts of zinc ricinoleate, 1-3 parts of emulsified silicone oil, 2-4 parts of glyceryl monostearate and 1-2 parts of paraffin oil;
and S4, mixing, extruding, cooling, drying and granulating all the substances weighed in the step S3 together, and then preparing the finished product packaging bag by a conventional film blowing process.
Further, the particle size of the nano stone needle powder in the step S1 is 20-60 nm; the volume fraction of hydrogen peroxide in the hydrogen peroxide solution is 8-10%; the mass fraction of the silane coupling agent in the silane coupling agent solution is 10-15%.
Further, the silane coupling agent is a silane coupling agent kh 550.
Further, the weight ratio of the graphite powder in the step S2, the nano stone needle powder treated in the step S1 and the modification liquid is 20-25: 4-6: 200-240; the modifying solution comprises the following components in parts by weight: 10-15 parts of dodecyl trimethyl ammonium bromide, 4-7 parts of sodium hexametaphosphate, 1-3 parts of lanthanum nitrate, 2-5 parts of zinc chloride, 3-6 parts of disodium magnesium ethylene diamine tetraacetate, 8-10 parts of nonylphenol polyoxyethylene ether and 300-330 parts of deionized water; and the rotating speed of stirring is controlled to be 1800-2000 r/min during high-speed stirring treatment.
Further, the antibacterial agent in step S3 is nano silver and nano titanium dioxide, which are mixed according to a weight ratio of 1: 3, and mixing.
The process can obviously improve the packaging use quality of the packaging bag and improve the storage shelf life of the stored grains. To further demonstrate the present invention, the following examples are specifically disclosed.
Example 1
A processing method of a grain packaging bag comprises the following steps:
s1, firstly, placing the nano stone needle powder into a hydrogen peroxide solution for soaking for 20min, taking out the nano stone needle powder after the soaking for one time by using deionized water, finally, soaking the nano stone needle powder into a silane coupling agent solution for soaking for 35min, and drying the nano stone needle powder for 1h for later use after the nano stone needle powder is taken out;
s2, immersing graphite powder and the nano stone needle powder processed in the step S1 into a modification liquid together, heating to keep the temperature of the modification liquid at 65 ℃, stirring at a high speed for 2 hours, and filtering to obtain mixed powder for later use;
s3, weighing the following substances in parts by weight for later use: 80 parts of polyethylene, 15 parts of polypropylene, 7 parts of the mixed powder prepared in the step S2, 1 part of antibacterial agent, 2 parts of zinc ricinoleate, 1 part of emulsified silicone oil, 2 parts of glyceryl monostearate and 1 part of paraffin oil;
and S4, mixing, extruding, cooling, drying and granulating all the substances weighed in the step S3 together, and then preparing the finished product packaging bag by a conventional film blowing process.
Further, the particle size of the nano stone needle powder in the step S1 is 20-60 nm; the volume fraction of hydrogen peroxide in the hydrogen peroxide solution is 8%; the mass fraction of the silane coupling agent in the silane coupling agent solution is 10%.
Further, the silane coupling agent is a silane coupling agent kh 550.
Further, the corresponding weight ratio of the graphite powder in the step S2, the nano stone needle powder treated in the step S1 and the modification solution is 20:4: 200; the modifying solution comprises the following components in parts by weight: 10 parts of dodecyl trimethyl ammonium bromide, 4 parts of sodium hexametaphosphate, 1 part of lanthanum nitrate, 2 parts of zinc chloride, 3 parts of disodium magnesium ethylene diamine tetraacetate, 8 parts of nonylphenol polyoxyethylene ether and 300 parts of deionized water; the rotating speed of stirring is controlled to be 1800 rpm during the high-speed stirring treatment.
Further, the antibacterial agent in step S3 is nano silver and nano titanium dioxide, which are mixed according to a weight ratio of 1: 3, and mixing.
Example 2
A processing method of a grain packaging bag comprises the following steps:
s1, firstly, putting the nano stone needle powder into a hydrogen peroxide solution for soaking for 22min, taking out the nano stone needle powder after the soaking for one time by using deionized water, finally, soaking the nano stone needle powder into a silane coupling agent solution for soaking for 37min, and drying the nano stone needle powder for 1.3h for later use;
s2, immersing graphite powder and the nano stone needle powder processed in the step S1 into a modification liquid together, heating to keep the temperature of the modification liquid at 66 ℃, stirring at a high speed for 2.4 hours, and filtering to obtain mixed powder for later use;
s3, weighing the following substances in parts by weight for later use: 82 parts of polyethylene, 18 parts of polypropylene, 9 parts of the mixed powder prepared in the step S2, 1.5 parts of an antibacterial agent, 2.6 parts of zinc ricinoleate, 2 parts of emulsified silicone oil, 3 parts of glyceryl monostearate and 1.5 parts of paraffin oil;
and S4, mixing, extruding, cooling, drying and granulating all the substances weighed in the step S3 together, and then preparing the finished product packaging bag by a conventional film blowing process.
Further, the particle size of the nano stone needle powder in the step S1 is 20-60 nm; the volume fraction of hydrogen peroxide in the hydrogen peroxide solution is 9%; the mass fraction of the silane coupling agent in the silane coupling agent solution is 12%.
Further, the silane coupling agent is a silane coupling agent kh 550.
Further, the corresponding weight ratio of the graphite powder in the step S2, the nano stone needle powder treated in the step S1 and the modification solution is 22:5: 225; the modifying solution comprises the following components in parts by weight: 13 parts of dodecyl trimethyl ammonium bromide, 6 parts of sodium hexametaphosphate, 2 parts of lanthanum nitrate, 4 parts of zinc chloride, 5 parts of disodium magnesium ethylene diamine tetraacetate, 9 parts of nonylphenol polyoxyethylene ether and 320 parts of deionized water; the rotating speed of stirring is controlled to be 1900 revolutions per minute during the high-speed stirring treatment.
Further, the antibacterial agent in step S3 is nano silver and nano titanium dioxide, which are mixed according to a weight ratio of 1: 3, and mixing.
Example 3
A processing method of a grain packaging bag comprises the following steps:
s1, firstly, putting the nano stone needle powder into a hydrogen peroxide solution for soaking for 25min, taking out the nano stone needle powder after the soaking, washing the nano stone needle powder with deionized water, finally, soaking the nano stone needle powder into a silane coupling agent solution for soaking for 40min, and drying the nano stone needle powder for 1.5h for later use;
s2, immersing graphite powder and the nano stone needle powder processed in the step S1 into a modification liquid together, heating to keep the temperature of the modification liquid at 70 ℃, stirring at a high speed for 2.5 hours, and filtering to obtain mixed powder for later use;
s3, weighing the following substances in parts by weight for later use: 85 parts of polyethylene, 20 parts of polypropylene, 10 parts of the mixed powder prepared in the step S2, 2 parts of an antibacterial agent, 3 parts of zinc ricinoleate, 3 parts of emulsified silicone oil, 4 parts of glyceryl monostearate and 2 parts of paraffin oil;
and S4, mixing, extruding, cooling, drying and granulating all the substances weighed in the step S3 together, and then preparing the finished product packaging bag by a conventional film blowing process.
Further, the particle size of the nano stone needle powder in the step S1 is 20-60 nm; the volume fraction of hydrogen peroxide in the hydrogen peroxide solution is 10 percent; the mass fraction of the silane coupling agent in the silane coupling agent solution is 15%.
Further, the silane coupling agent is a silane coupling agent kh 550.
Further, the corresponding weight ratio of the graphite powder in the step S2, the nano stone needle powder treated in the step S1 and the modification solution is 25:6: 240; the modifying solution comprises the following components in parts by weight: 15 parts of dodecyl trimethyl ammonium bromide, 7 parts of sodium hexametaphosphate, 3 parts of lanthanum nitrate, 5 parts of zinc chloride, 6 parts of disodium magnesium ethylene diamine tetraacetate, 10 parts of nonylphenol polyoxyethylene ether and 330 parts of deionized water; the rotating speed of stirring is controlled to be 2000 r/min during the high-speed stirring treatment.
Further, the antibacterial agent in step S3 is nano silver and nano titanium dioxide, which are mixed according to a weight ratio of 1: 3, and mixing.
Example 4
A processing method of a grain packaging bag comprises the following steps:
s1, firstly, putting the nano stone needle powder into a hydrogen peroxide solution for soaking for 22min, taking out the nano stone needle powder after the soaking for one time by using deionized water, finally, soaking the nano stone needle powder into a silane coupling agent solution for soaking for 37min, and drying the nano stone needle powder for 1.3h for later use;
s2, mixing and stirring the graphite powder and the nano stone needle powder processed in the step S1 uniformly to obtain mixed powder for later use;
s3, weighing the following substances in parts by weight for later use: 82 parts of polyethylene, 18 parts of polypropylene, 9 parts of the mixed powder prepared in the step S2, 1.5 parts of an antibacterial agent, 2.6 parts of zinc ricinoleate, 2 parts of emulsified silicone oil, 3 parts of glyceryl monostearate and 1.5 parts of paraffin oil;
and S4, mixing, extruding, cooling, drying and granulating all the substances weighed in the step S3 together, and then preparing the finished product packaging bag by a conventional film blowing process.
Further, the particle size of the nano stone needle powder in the step S1 is 20-60 nm; the volume fraction of hydrogen peroxide in the hydrogen peroxide solution is 9%; the mass fraction of the silane coupling agent in the silane coupling agent solution is 12%.
Further, the silane coupling agent is a silane coupling agent kh 550.
Further, the weight ratio of the graphite powder in the step S2 to the nano stone needle powder treated in the step S1 is 22: 5.
Further, the antibacterial agent in step S3 is nano silver and nano titanium dioxide, which are mixed according to a weight ratio of 1: 3, and mixing.
Compared with example 2, in this example 4, the step of mixing graphite powder and the nano stone needle powder treated in step S1 in a modifying solution is omitted, except that the steps of the method are the same.
Example 5
A processing method of a grain packaging bag comprises the following steps:
s1, weighing the following substances in parts by weight for later use: 82 parts of polyethylene, 18 parts of polypropylene, 9 parts of graphite powder, 1.5 parts of an antibacterial agent, 2.6 parts of zinc ricinoleate, 2 parts of emulsified silicone oil, 3 parts of glyceryl monostearate and 1.5 parts of paraffin oil;
and S2, mixing, extruding, cooling, drying and granulating all the substances weighed in the step S1 together, and then preparing the finished product packaging bag by a conventional film blowing process.
Further, the antibacterial agent in step S1 is nano silver and nano titanium dioxide, which are mixed according to a weight ratio of 1: 3, and mixing.
In comparison with example 2, example 5 omits the preparation and addition of the mixed powder, except that the steps of the method are the same.
In order to compare the effects of the present invention, the performance tests were performed on the packaging bags prepared in the above examples 2, 4 and 5, wherein the specification of each set of packaging bags was controlled to be 35 × 15cm and the single layer thickness was 100 μm; each group is provided with 3 groups of repeated tests, and then 3 times of repeated tests are carried out, wherein the test specifically comprises encapsulating the same batch of prepared five-excellent-rice No. 4 rice mechanism germ rice in the pairIn the corresponding packaging bag, the used plastic film sealing machine is FS-500 type produced by Deqing Byje electrical appliances company Limited; 600g of the powder is contained in each packaging bag, and then the packaging bag is placed into a climatic box for storage, wherein the storage condition is that the temperature is 25 ℃ and the relative humidity is 65%. Sampling every 7 d for index measurement, and storing for 35 d; the index of the corresponding measurement during the period is O2And CO2Determination of volume fraction, and determination of lipase activity; wherein the packaging bag is internally provided with O2And CO2Volume fraction of (A) is defined by OXYBABYM + O2/CO2And (4) measuring by using a portable gas analyzer. After calibrating the instrument, the package is sealed with a gasket, and the test needle is inserted into the gasket to determine the amount of O in the package2And CO2Volume fraction, 3 replicates; the activity of the lipase is determined according to GB/T5523-2008, and is also determined in parallel for 3 times; the specific experimental results are shown in the attached drawings of the specification.
As can be seen from FIGS. 1 and 2, as the storage time increases, the O content in each group of the packaging bags increases2Is constantly decreasing in volume fraction of CO2The volume fraction of (A) is gradually increased because the germinated rice contains a large amount of germs and performs strong aerobic respiration during storage to consume O2Production of CO2The packaging bag of example 2 was kept at a lower O level until the storage time was about 25 d2And higher CO2This is because the packaging bag of example 2 has better barrier properties, lower oxygen and carbon dioxide transmission rates than the other two, slowing down the exchange of gas between the inside and outside of the packaging bag. The packaging bag of example 2 was capable of autonomously adjusting the gas content in the bag, maintaining a low oxygen and high carbon dioxide level, and stored for 35 days, and the packaging bag of example 2 was filled with O2Is slightly higher than the other two, CO2The volume fraction of (2) was close to that of (3) because the germinated rice produced a large amount of mold in the packaging bags of examples 4 and 5 until the late stage of storage, the mold was aerobic, and the growth of the mold consumed a large amount of O2Production of CO2The packaging bag of example 2 has very good antibacterial property and low oxygen and high carbon dioxide environment, so that the growth of mold is effectively inhibitedIn the later storage period, there will be O in the bag2Is slightly higher than other packages, CO2The volume fractions of (a) and (b) are relatively close. It can be seen that the packaging bag of example 2 can more effectively inhibit the aerobic respiration of the milled rice during storage, and delay the deterioration of the quality of the milled rice.
As can be seen from FIG. 3, the lipase activity in the package of example 2 increased from 4.25 mg/g to 5.73 mg/g, which was lower than 7.16 mg/g of example 4 and 7.88 mg/g of example 5; the higher the lipase activity is, the more severe the fat oxidation reaction is, the more obvious the deterioration degree of the germ rice quality is, the lipase is a general name of a class of enzymes for hydrolyzing ester bonds, the hydrolysis reaction can be carried out under the condition of water, the packaging bag material in the embodiment 2 has good barrier property, the water entering outside the bag can be reduced, and the hydrolysis reaction rate of fat is reduced. Meanwhile, the low oxygen environment in the packaging bag can delay the fat oxidation rate and inhibit the enzyme activity, and further proves that the packaging bag has the effect of obviously delaying the quality deterioration of the germ rice.

Claims (5)

1. A processing method of a grain packaging bag is characterized by comprising the following steps:
s1, firstly, putting the nano stone needle powder into a hydrogen peroxide solution for soaking for 20-25 min, taking out the nano stone needle powder after the soaking for one time by using deionized water, finally, soaking the nano stone needle powder into a silane coupling agent solution for soaking for 35-40 min, and taking out the nano stone needle powder and drying the nano stone needle powder for 1-1.5 h for later use;
s2, immersing graphite powder and the nano stone needle powder processed in the step S1 into a modification liquid together, heating to keep the temperature of the modification liquid at 65-70 ℃, stirring at a high speed for 2-2.5 h, and filtering to obtain mixed powder for later use;
s3, weighing the following substances in parts by weight for later use: 80-85 parts of polyethylene, 15-20 parts of polypropylene, 7-10 parts of the mixed powder prepared in the step S2, 1-2 parts of an antibacterial agent, 2-3 parts of zinc ricinoleate, 1-3 parts of emulsified silicone oil, 2-4 parts of glyceryl monostearate and 1-2 parts of paraffin oil;
and S4, mixing, extruding, cooling, drying and granulating all the substances weighed in the step S3 together, and then preparing the finished product packaging bag by a conventional film blowing process.
2. The processing method of the grain packaging bag according to claim 1, wherein the particle size of the nano stone needle powder in the step S1 is 20-60 nm; the volume fraction of hydrogen peroxide in the hydrogen peroxide solution is 8-10%; the mass fraction of the silane coupling agent in the silane coupling agent solution is 10-15%.
3. The processing method of grain packaging bags according to claim 2, wherein the silane coupling agent is a silane coupling agent kh 550.
4. The processing method of the grain packaging bag according to claim 1, wherein the weight ratio of the graphite powder in the step S2, the nano stone needle powder treated in the step S1 and the modifying liquid is 20-25: 4-6: 200-240; the modifying solution comprises the following components in parts by weight: 10-15 parts of dodecyl trimethyl ammonium bromide, 4-7 parts of sodium hexametaphosphate, 1-3 parts of lanthanum nitrate, 2-5 parts of zinc chloride, 3-6 parts of disodium magnesium ethylene diamine tetraacetate, 8-10 parts of nonylphenol polyoxyethylene ether and 300-330 parts of deionized water; and the rotating speed of stirring is controlled to be 1800-2000 r/min during high-speed stirring treatment.
5. The processing method of grain packaging bag as claimed in claim 1, wherein the antibacterial agent in step S3 is nano silver and nano titanium dioxide according to weight ratio of 1: 3, and mixing.
CN201911092641.3A 2019-11-11 2019-11-11 Processing method of grain packaging bag Withdrawn CN110746677A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113549342A (en) * 2021-09-02 2021-10-26 和也健康科技有限公司 Method for modifying surface of stone needle powder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113549342A (en) * 2021-09-02 2021-10-26 和也健康科技有限公司 Method for modifying surface of stone needle powder

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