CN115594880A - Active starch-based foaming sheet material with sustained and controlled oxygen release function and preparation method and application thereof - Google Patents
Active starch-based foaming sheet material with sustained and controlled oxygen release function and preparation method and application thereof Download PDFInfo
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- CN115594880A CN115594880A CN202210700119.4A CN202210700119A CN115594880A CN 115594880 A CN115594880 A CN 115594880A CN 202210700119 A CN202210700119 A CN 202210700119A CN 115594880 A CN115594880 A CN 115594880A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000001301 oxygen Substances 0.000 title claims abstract description 86
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
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- 235000019402 calcium peroxide Nutrition 0.000 claims abstract description 32
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
- C08J9/365—Coating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2303/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2303/02—Starch; Degradation products thereof, e.g. dextrin
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2401/02—Cellulose; Modified cellulose
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- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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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
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention discloses an active starch-based foaming sheet material with a sustained and controlled oxygen release function, and a preparation method and application thereof. The active starch-based foaming plate is formed by coating a coating on an inner layer; the coating is an oxygen release compound, and the inner layer is a starch-based foaming board material; the oxygen release compound is prepared by dispersing calcium peroxide in a hydrophilic polymer solution, wherein the hydrophilic polymer is one or a mixture of more than two of pectin, starch, polyethylene glycol and polyvinyl alcohol; the starch-based foaming board material is prepared from starch, cellulose, polyvinyl alcohol, a nucleating agent, a foaming agent and a plasticizer; the foaming process has high degree of continuity and short production period, and can realize large-scale industrial production. The controlled-release oxygen functional starch-based foaming material has the advantages of long oxygen release time, controllable oxygen release rate, good mechanical buffer performance, relatively simple preparation process, easiness in industrial popularization and the like, and has good application value in low-temperature cold-chain controlled atmosphere transportation application of fruits and vegetables.
Description
Technical Field
The invention relates to a starch-based foaming board material, in particular to an active starch-based foaming board material with a sustained and controlled oxygen release function, a preparation method and application thereof, and belongs to the technical field of active high polymer materials.
Background
With the rapid development of the logistics transportation industry, the consumption of foam and air column bag cushion packaging products is increasing sharply. This greatly accelerates the consumption of petroleum-based non-renewable resources worldwide while also placing a heavy burden on the environment. With the gradual improvement of environmental protection consciousness of people, the degradable buffer packaging material with both buffer performance and appropriate functionality is in the way of researching hot tide. Compared with other biodegradable high molecular polymers, the starch as a natural high molecular polymer taking glucose molecules as basic units has the advantages of low cost, rich content, reproducibility, full degradation, easy processing and the like, and the starch-based foaming material constructed by taking the starch as a main raw material has good mechanical property and certain hygroscopicity and can be used as a carrier of a functional compound, so the starch-based foaming material is concerned in the field of food packaging.
The modified atmosphere technology is a common preservation technology in fruit and vegetable storage, and the modified atmosphere packaging has the advantages of low cost and easy market popularization, and is concerned by researchers. The current modified atmosphere packaging mainly utilizes certain permeability of micron-sized pore diameter of the packaging or the selective permeability of material components to gas to regulate and control the atmosphere in the packaging. At present, various packaging films having a modified atmosphere function, such as a laser perforation oriented polypropylene film, a low barrier oriented polyester film, a high barrier polyvinyl alcohol film, a polypropylene/low density polyethylene composite film, and the like, have been developed. When the preservative films are used for packaging fruits and vegetables, the shelf life of the fruits and vegetables can be effectively prolonged. However, these high molecular polymer materials are expensive to process and generally not easily biodegradable, and excessive use of these high molecular polymer materials inevitably brings heavy burden to the environment, and is very inconsistent with the concept of conservation, greenness and environmental protection. Therefore, there is a need for development and research of low-cost and environment-friendly modified atmosphere preservation technology.
The Chinese patent application 202110089484.1 discloses a starch-based multilayer foaming buffer supporting plate and a preparation method thereof, wherein the preparation method comprises the following steps: 1) Mixing the materials; 2) Preparing master batches; 3) Regulating and controlling the moisture; 4) And preparing the multilayer foamed buffer support plate. The material mixing is to fully stir and mix the starch, the plasticizer, the nucleating agent, the foaming agent, the solid alkali, the long-chain alkenyl succinic anhydride and the binder. The starch-based foamed board with good impact resistance and support performance is prepared by the technology, the foaming multiplying power of the starch-based multilayer foamed buffer support board reaches 6-8 times, the mechanical compression strength reaches 2-4Mpa, and the rebound rate is 52-68%, but the technology does not have the function of oxygen control.
Calcium peroxide is a non-toxic and odorless green chemical product, and gradually decomposes when encountering humid air, and releases oxygen (the available oxygen content is 22.2%). If the calcium peroxide can be effectively loaded in the starch-based foaming material, the moisture absorption performance of the starch-based foaming material can be utilized to realize effective regulation and control of the oxygen release behavior of the calcium peroxide, thereby providing an idea for developing a novel low-cost fully-degradable modified atmosphere buffering packaging material. However, the compatibility between inorganic calcium peroxide and organic high molecular polymer starch is very poor, and uniform loading cannot be realized; moreover, the preparation of starch-based foaming materials usually involves high-temperature and high-humidity processes, and the processing process of simple blending inevitably causes the significant reduction of the effective content of calcium peroxide and the partial or complete loss of the oxygen release function of the calcium peroxide.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the starch-based foaming board material with the air conditioning function and the good mechanical buffering performance, which is low in price of raw materials, green, safe and environment-friendly, and capable of being produced industrially.
The invention also aims to provide the application of the active starch-based foaming plate with the controlled and controlled oxygen release function in the logistics transportation of the controlled atmosphere preservation of fruits and vegetables.
The purpose of the invention is realized by the following technical scheme:
an active starch-based foaming plate with a sustained and controlled oxygen release function is formed by coating a coating on an inner layer; the coating is an oxygen release compound, and the inner layer is a starch-based foaming board material; the oxygen release compound is prepared by dispersing calcium peroxide in a hydrophilic polymer solution, wherein the hydrophilic polymer is one or a mixture of more than two of pectin, starch, polyethylene glycol and polyvinyl alcohol; the starch-based foaming board material is prepared from starch, cellulose, polyvinyl alcohol, a nucleating agent, a foaming agent and a plasticizer.
In order to further achieve the purpose of the present invention, preferably, the mass ratio of the oxygen-releasing composite to the starch-based foam board material is 1:2-4, and the corresponding thickness ratio is 1:10 to 20.
Preferably, the mass ratio of the calcium peroxide to the hydrophilic polymer matrix is 1:1 to 4; the effective content of the calcium peroxide is 55-80%, wherein the content of the calcium hydroxide is 10-35%, and the content of the calcium carbonate is 1-10%;
the mass ratio of the hydrophilic polymer to the water in the hydrophilic polymer solution is 0.5-1:9.
Preferably, the pectin has a galacturonic acid methyl esterification degree of 35-55%, a molecular weight of 10000-200000 Da, and is a light yellow powdery solid; the starch in the hydrophilic polymer is one or a mixture of more than two of corn starch, barley starch, wheat starch, potato starch and cassava starch; the molecular weight of the polyethylene glycol is 1500-3500 Da; the molecular weight of the polyvinyl alcohol is 150000-220000 Da, and the polyvinyl alcohol is white flocculent or powdery solid
Preferably, the starch-based foam board material comprises the following raw materials:
preferably, the starch is selected from one or a mixture of more than two of corn starch, barley starch, wheat starch, potato starch, pea starch and cassava starch;
the modified starch is selected from one or a mixture of more than two of corn starch, barley starch, wheat starch, potato starch, pea starch and cassava starch which are modified by etherification, esterification or crosslinking.
The molecular weight of the polyvinyl alcohol is 150000-220000 Da, and the polyvinyl alcohol is white flocculent or powdery solid.
The foaming agent is selected from one or two of water and sodium bicarbonate;
the nucleating agent is selected from one or more of calcium carbonate, microcrystalline cellulose and microcrystalline starch;
the plasticizer is selected from one or more of water, glycerol, sorbitol, xylitol, oleic acid and polyethylene glycol.
Preferably, the preparation method of the starch-based foam board material comprises the following steps:
s1, nucleating agent pretreatment: drying and crushing the nucleating agent, and controlling the water content in the nucleating agent to be below 7%;
s2, raw material blending: adding starch or modified starch, cellulose, polyvinyl alcohol, a foaming agent, a nucleating agent and a plasticizer into a mixer, and uniformly mixing to obtain a mixed material;
s3, preparing granular materials: extruding and granulating the powdery premix through a double-screw extruder to obtain granular materials;
s4, foaming: and (3) regulating the moisture of the granular material, and foaming the granular material through a single-screw extruder to obtain the starch-based foaming board material.
Preferably, the drying process parameters of the nucleating agent in the step S1 are as follows: drying at 150-200 deg.C for 1.5-4 hr, and pulverizing to 50-70um;
in the step S2, the raw material blending is carried out for 5-20min at the speed of 100-200 rpm/min;
in the step S3, the length-diameter ratio of the double-screw extruder is 25-44, the screw rotating speed is 50-250rpm/min, the aperture of the die head is 2-4mm, the temperature range of each zone is 30-120 ℃, the sample injection flow of the blend is 10-40L/h, and the sample injection flow of water is 20-50ml/min.
In step S4, the moisture of the granular materials is regulated to control the moisture content of the granular materials to be 13-18%; the length-diameter ratio of a single-screw extruder foamed by the single-screw extruder is 15-30, the screw rotating speed is 70-180r/min, the parameters of a sheet die head are that the thickness is 2-10mm, the length is 200-1000mm, the temperature range of each interval is set to be 120-200 ℃, and the rotating speed of the single-screw extruder is set to be 120-170 r/min; the extrusion pressure of the machine head is 20-35MPa.
The preparation method of the active starch-based foaming board with the sustained and controlled oxygen release function is characterized in that a hydrophilic polymer solution and calcium peroxide are fully mixed to prepare an oxygen release compound; and uniformly coating the oxygen release compound on the surface of the starch-based foaming material, and drying to obtain the active starch-based foaming board with the function of sustained and controlled oxygen release.
The active starch-based foaming plate with the controlled-release oxygen function is applied to the logistics transportation of fruit and vegetable controlled-atmosphere preservation.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides an active starch-based foaming board material with a sustained and controlled oxygen release function and a preparation method thereof.
2. According to the active starch-based foaming board material with the function of slowly releasing oxygen, calcium peroxide is loaded in the starch-based foaming board material, and the oxygen release rate of the active starch-based foaming material can be regulated by regulating the blending ratio of different hydrophilic polymers and the calcium peroxide and the ratio of an oxygen release compound and the starch-based foaming material, so that different air-conditioning effects are realized.
3. The active starch-based foaming board material with the function of slowly releasing oxygen has the functions of inhibiting bacteria, disinfecting, absorbing moisture and preventing condensation, and has potential application prospects in the fields of fruit preservation and the like.
4. The coating technology adopted by the invention is simple and easy to operate, and the extrusion process has the advantages of high degree of continuity, short production period, low production cost and the like, and can realize large-scale industrial production.
5. The active starch-based foaming board material with the controlled-release oxygen function has the advantages that the raw material sources and the processing technology are green and environment-friendly, the product can be naturally and fully degraded in the natural environment, and the ecological safety is realized; meanwhile, the main base material is edible starch, and the active foaming product can be safely applied to the fields of fruit and vegetable fresh keeping and the like with higher requirements on safety.
6. The active starch-based foaming board material with the controlled and sustained oxygen release function and the preparation scheme thereof provide a novel and practical method for innovative research and application of controlled atmosphere preservation technology.
Drawings
FIG. 1 is a graph of oxygen release behavior of starch-based foamed sheets of examples 1-3.
FIG. 2 is a graph showing the change in appearance of guava fruit according to example 8.
Detailed Description
For better understanding of the present invention, the present invention will be further described with reference to the following drawings and examples, which should not be construed as limiting the scope of the present invention in any way. The equipment and reagents adopted by the invention are the equipment and reagents which are conventional and commercially available in the technical field unless specifically stated.
According to the oxygen release function of the calcium peroxide and the fact that the starch-based foaming material can be used as a fruit and vegetable preservation material, the effective load of the calcium peroxide in the starch-based foaming material can be thought, and the moisture absorption performance of the starch-based foaming material is utilized to realize the effective regulation and control of the oxygen release behavior of the calcium peroxide, so that an idea is provided for developing a novel low-cost fully-degradable air-conditioning buffer packaging material, however, the compatibility between the inorganic calcium peroxide and the organic high polymer starch is extremely poor, and uniform load cannot be realized; the invention discloses a preparation method of a starch-based foaming material, which generally relates to a high-temperature high-humidity process, wherein a simple blending processing process inevitably causes the significant reduction of the effective content of calcium peroxide and the partial or complete loss of the oxygen release function of the calcium peroxide.
The active starch-based foaming board material capable of slowly releasing oxygen comprises the main components of starch, polyvinyl alcohol, cellulose and other high polymer polymers as the inner layer starch-based foaming board material, and the blend can be subjected to wide interaction through an extrusion foaming technology to finally form an elastic and extensible space network structure whole; the main component of the coating oxygen release complex is a blend of calcium peroxide and hydrophilic polymers such as pectin. Wherein the calcium peroxide microparticles are uniformly dispersed in a three-dimensional network structure formed by hydrophilic polymer molecular chains. In a high-humidity environment, the slow water absorption effect of the hydrophilic polymer, the embedding effect of the three-dimensional network microstructure on calcium peroxide and the competitive water absorption effect of the starch-based foaming material are cooperatively utilized to realize the gradient control on the chemical reaction rate of the calcium peroxide and water molecules, so that the aim of controllably and slowly releasing oxygen is fulfilled.
The active starch-based foam board material with the function of slowly releasing oxygen is prepared by adopting a two-step extrusion process and combining a coating technology. Firstly, preparing thermoplastic starch granules by adopting a double-screw extrusion technology; then, adjusting the moisture content of the granules, and melting the granules through a high-temperature high-pressure single-screw extrusion environment; then, due to the existence of the nucleating agent, a free energy difference is formed inside the fluid, and a large pressure is released from the system at the moment of extrusion, and a large number of air chambers are formed in the system; further, at the head, the water in the system can be instantaneously vaporized and leave a large number of cells in the material system, forming a starch-based foam board material. And finally, preparing the oxygen release composite coating, quickly and uniformly coating the oxygen release composite coating on the surface of the starch-based foaming material, and drying to obtain the starch-based foaming board material with the oxygen release function.
Comparative example 1 starch-based foam board material I
1) Nucleating agent pretreatment: drying calcium carbonate until the water content is 6wt%, and crushing to 70um;
2) Raw material blending: adding 90wt% of cassava starch, 1.5wt% of cellulose, 1wt% of polyvinyl alcohol, 1wt% of water and 0.5wt% of nucleating agent into a mixer by mass percent, and premixing at 100rpm/min for 5min; water (5 wt%) and plasticizer glycerol (1 wt%) were added and blended at 100rpm/min for 20min.
3) Rod (strip) like material preparation: the twin-screw extruder is set to be 9 temperature zones, which are respectively as follows: starting from a charging port, the first section temperature of the screw is 30 ℃, the second section temperature of the screw is 30 ℃, the third section temperature of the screw is 30 ℃, the fourth section temperature of the screw is 105 ℃, the fifth section temperature of the screw is 105 ℃, the sixth section temperature of the screw is 75 ℃, the seventh section temperature of the screw is 75 ℃, the eighth section temperature of the screw is 70 ℃ and the ninth section temperature of the screw is 70 ℃; setting the rotating speed of the screw to be 70rpm/min; the sample injection flow rate of water is 50ml/min, after the temperature of each area of the double-screw extruder is stable, the blend material obtained in the step 2 is added into the double-screw extruder through a feeding device at the sample injection flow rate of 40L/h, and a continuous and uniform rod (strip) shaped material is obtained through extrusion;
4) Pelletizing: the rod (strand) material was transported backward through a conveyor belt with an air-cooling device and cooled, and cut into pellets having a length of 5mm using a cutter at a rotation speed of 30 rpm/min.
5) Foaming: balancing the water content of the prepared granular material to be 18%, and adjusting the screw rotating speed of the single-screw extruder to 150rpm/min; 3 temperature zones are set, which are respectively as follows: the temperature of the first section of the screw from the charging port is 135 ℃, the temperature of the second section of the screw is 185 ℃, the temperature of the third section of the screw is 200 ℃ and the temperature of the machine head is 200 ℃; setting the rotating speed of the single screw extruder to be 160r/min; the extrusion pressure of the machine head is set to be 35MPa. After the temperature of each zone of the single-screw extruder is stable, adding the granular material into the single-screw extruder from a feed inlet, and extruding and foaming through preset parameters to obtain the starch-based foaming board material I serving as 1 comparative example.
Example 1 starch-based foam Board Material II
1) Nucleating agent pretreatment: drying calcium carbonate until the water content is 6wt%, and crushing to 70um;
2) Raw material blending: adding corn starch (88 wt%), cellulose (3.5 wt%), polyvinyl alcohol (1 wt%), water (1 wt%) and nucleating agent (calcium carbonate, 0.5 wt%) into a mixer by mass percent, and premixing for 5min at 150rpm/min; water (4 wt%) and plasticizer glycerol (2 wt%) were added and blended at 160rpm/min for 20min.
3) Rod (strip) like material preparation: the double-screw extruder is set to be 9 temperature zones, which are respectively as follows: the temperature of the first section of the screw from the charging port is 30 ℃, the temperature of the second section of the screw is 40 ℃, the temperature of the third section of the screw is 40 ℃, the temperature of the fourth section of the screw is 100 ℃, the temperature of the fifth section of the screw is 100 ℃, the temperature of the sixth section of the screw is 65 ℃, the temperature of the seventh section of the screw is 65 ℃, the temperature of the eighth section of the screw is 60 ℃ and the temperature of the ninth section of the screw is 60 ℃; setting the rotating speed of the screw to be 60rpm/min; the sample injection flow rate of water is 20ml/min, after the temperature of each area of the double-screw extruder is stable, the blend obtained in the step 2 is added into the double-screw extruder through a feeding device at the sample injection flow rate of 40L/h, and a continuous and uniform rod (strip) material is obtained through extrusion;
4) Pelletizing: the rod (strand) material was transported backward through a conveyor belt with an air-cooling device and cooled, and cut into pellets having a length of 5mm using a cutter at a rotation speed of 30 rpm/min.
5) Foaming: the water content of the prepared granular material is balanced to be 14 percent, and the screw rotating speed of the single screw extruder is adjusted to 150rpm/min; 3 temperature zones are set, which are respectively as follows: the temperature of the first section of the screw from the charging opening is 130 ℃, the temperature of the second section of the screw is 195 ℃, the temperature of the third section of the screw is 200 ℃ and the temperature of the machine head is 200 ℃; setting the rotating speed of the single screw extruder to be 120r/min; the extrusion pressure of the machine head is set to be 25MPa. And after the temperature of each area of the single-screw extruder is stable, adding granular materials into the single-screw extruder from a feeding port, and extruding and foaming through preset parameters to obtain the starch-based foaming board material.
6) Coating: mixing polyvinyl alcohol and water according to the weight ratio of 0.1:9.9, heating in a water bath at 80 ℃ for 30min to prepare a polyvinyl alcohol aqueous solution; when the solution temperature is cooled to room temperature, mixing calcium peroxide and polyvinyl alcohol solution according to the ratio of 1:2, sufficiently mixing the components in a mass ratio to prepare an oxygen-releasing composite matrix; and rapidly and uniformly coating the oxygen release composite matrix on the surface of the starch-based foaming board material, and controlling the mass ratio of the oxygen release composite matrix to the starch-based foaming board material to be 1:2, preparing an active coating; and drying the starch-based foam board material with the active coating in a hot air circulation oven at 40 ℃ for 30min to finally obtain an active starch-based foam board material II.
Example 2 starch-based foam Board Material III
1) Nucleating agent pretreatment: drying calcium carbonate until the water content is 6%, and crushing the calcium carbonate to 70um;
2) Raw material blending: adding corn starch (88 wt%), cellulose (3.5 wt%), polyvinyl alcohol (1 wt%), water (1 wt%) and nucleating agent (calcium carbonate, 0.5 wt%) into a mixer by mass percent, and premixing for 5min at 150rpm/min; water (4 wt%) and plasticizer glycerol (2 wt%) were added and blended at 160rpm/min for 20min.
3) Rod (strip) like material preparation: the double-screw extruder is set to be 9 temperature zones, which are respectively as follows: starting from a feed port, the temperature of a first section of the screw is 30 ℃, the temperature of a second section of the screw is 40 ℃, the temperature of a third section of the screw is 40 ℃, the temperature of a fourth section of the screw is 100 ℃, the temperature of a fifth section of the screw is 100 ℃, the temperature of a sixth section of the screw is 65 ℃, the temperature of a seventh section of the screw is 65 ℃, the temperature of an eighth section of the screw is 60 ℃ and the temperature of a ninth section of the screw is 60 ℃; setting the rotating speed of the screw to be 60rpm/min; the sample injection flow rate of water is 20ml/min, after the temperature of each area of the double-screw extruder is stable, the blend obtained in the step 2 is added into the double-screw extruder through a feeding device at the sample injection flow rate of 40L/h, and a continuous and uniform rod (strip) material is obtained through extrusion;
4) Pelletizing: the rod (strand) material was transported backward through a conveyor belt with an air-cooling device and cooled, and cut into pellets having a length of 5mm using a cutter at a rotation speed of 30 rpm/min.
5) Foaming: the water content of the prepared granular material is balanced to be 14 percent, and the screw rotating speed of the single screw extruder is adjusted to 150rpm/min; 3 temperature zones are set, which are respectively as follows: the temperature of the first section of the screw from the charging opening is 130 ℃, the temperature of the second section of the screw is 195 ℃, the temperature of the third section of the screw is 200 ℃ and the temperature of the machine head is 200 ℃; setting the rotating speed of the single screw extruder to be 120r/min; the extrusion pressure of the machine head is set to be 25MPa. And after the temperature of each area of the single-screw extruder is stable, adding the granular material into the single-screw extruder from a feed inlet, and extruding and foaming through preset parameters to obtain the starch-based foaming board material.
6) Coating: mixing polyvinyl alcohol and water according to the weight ratio of 0.3:9.7, heating in a water bath at the temperature of 80 ℃ for 30min to prepare a polyvinyl alcohol aqueous solution; and (3) cooling the solution to room temperature, and mixing the calcium peroxide and the polyvinyl alcohol solution according to the ratio of 1:2, sufficiently mixing the components in a mass ratio to prepare an oxygen-releasing composite matrix; and rapidly and uniformly coating the oxygen release composite matrix on the surface of the starch-based foaming board material, and controlling the mass ratio of the oxygen release composite matrix to the starch-based foaming board material to be 1:2, preparing an active coating; and (3) drying the starch-based foaming board material with the active coating in a hot air circulation oven at 40 ℃ for 30min to finally obtain an active starch-based foaming board material III.
Example 3 starch-based foam Board Material IV
1) Nucleating agent pretreatment: drying calcium carbonate until the water content is 6%, and crushing the calcium carbonate to 70um;
2) Raw material blending: adding corn starch (88 wt%), cellulose (3.5 wt%), polyvinyl alcohol (1 wt%), water (1 wt%) and nucleating agent (calcium carbonate, 0.5 wt%) into a mixer by mass percent, and premixing for 5min at 150rpm/min; water (4 wt%) and plasticizer glycerol (2 wt%) were added and blended at 160rpm/min for 20min.
3) Rod (strip) like material preparation: the double-screw extruder is set to be 9 temperature zones, which are respectively as follows: the temperature of the first section of the screw from the charging port is 30 ℃, the temperature of the second section of the screw is 40 ℃, the temperature of the third section of the screw is 40 ℃, the temperature of the fourth section of the screw is 100 ℃, the temperature of the fifth section of the screw is 100 ℃, the temperature of the sixth section of the screw is 65 ℃, the temperature of the seventh section of the screw is 65 ℃, the temperature of the eighth section of the screw is 60 ℃ and the temperature of the ninth section of the screw is 60 ℃; setting the rotating speed of the screw to be 60rpm/min; the sample injection flow rate of water is 20ml/min, after the temperature of each area of the double-screw extruder is stable, the blend obtained in the step 2 is added into the double-screw extruder through a feeding device at the sample injection flow rate of 40L/h, and a continuous and uniform rod (strip) material is obtained through extrusion;
4) Pelletizing: the rod (strand) material was transported backward through a conveyor belt with an air-cooling device and cooled, and cut into pellets having a length of 5mm using a cutter at a rotation speed of 30 rpm/min.
5) Foaming: the water content of the prepared granular material is balanced to be 14 percent, and the screw rotating speed of the single screw extruder is adjusted to 150rpm/min; 3 temperature zones are set, which are respectively as follows: the temperature of the first section of the screw from the charging opening is 130 ℃, the temperature of the second section of the screw is 195 ℃, the temperature of the third section of the screw is 200 ℃ and the temperature of the machine head is 200 ℃; setting the rotating speed of the single screw extruder to be 120r/min; the extrusion pressure of the machine head is set to be 25MPa. And after the temperature of each area of the single-screw extruder is stable, adding the granular material into the single-screw extruder from a feed inlet, and extruding and foaming through preset parameters to obtain the starch-based foaming board material.
6) Coating: mixing polyvinyl alcohol and water according to the weight ratio of 0.5:9.5, heating in a water bath at the temperature of 80 ℃ for 30min to prepare a polyvinyl alcohol aqueous solution; and (3) cooling the solution to room temperature, and mixing the calcium peroxide and the polyvinyl alcohol solution according to the ratio of 1:2, sufficiently mixing the components in a mass ratio to prepare an oxygen release composite matrix; and rapidly and uniformly coating the oxygen release composite matrix on the surface of the starch-based foaming board material, and controlling the mass ratio of the oxygen release composite matrix to the starch-based foaming board material to be 1:2, preparing an active coating; and (3) drying the starch-based foaming board material with the active coating in a hot air circulation oven at 40 ℃ for 30min to finally obtain an active starch-based foaming board material IV.
Example 4 starch-based foam Board Material V
1) Nucleating agent pretreatment: drying calcium carbonate until the water content is 6%, and crushing the calcium carbonate to 70um;
2) Raw material blending: adding corn starch (88 wt%), cellulose (3.5 wt%), polyvinyl alcohol (1 wt%), water (1 wt%), nucleating agent (calcium carbonate, 0.5 wt%) into a mixer by mass percent, and premixing at 150rpm/min for 5min; water (4 wt%) and plasticizer glycerol (2 wt%) were added and blended at 160rpm/min for 20min.
3) Rod (strip) like material preparation: the double-screw extruder is set to be 9 temperature zones, which are respectively as follows: the temperature of the first section of the screw from the charging port is 30 ℃, the temperature of the second section of the screw is 40 ℃, the temperature of the third section of the screw is 40 ℃, the temperature of the fourth section of the screw is 100 ℃, the temperature of the fifth section of the screw is 100 ℃, the temperature of the sixth section of the screw is 65 ℃, the temperature of the seventh section of the screw is 65 ℃, the temperature of the eighth section of the screw is 60 ℃ and the temperature of the ninth section of the screw is 60 ℃; setting the rotating speed of the screw to be 60rpm/min; the sample injection flow rate of water is 20ml/min, after the temperature of each area of the double-screw extruder is stable, the blend obtained in the step 2 is added into the double-screw extruder through a feeding device at the sample injection flow rate of 40L/h, and a continuous and uniform rod (strip) material is obtained through extrusion;
4) Pelletizing: the rod (strand) material was transported backward through a conveyor belt with an air-cooling device and cooled, and cut into pellets having a length of 5mm using a cutter at a rotation speed of 30 rpm/min.
5) Foaming: the water content of the prepared granular material is balanced to be 14 percent, and the screw rotating speed of the single screw extruder is adjusted to 150rpm/min; 3 temperature zones are set, which are respectively as follows: the temperature of the first section of the screw from the charging opening is 130 ℃, the temperature of the second section of the screw is 195 ℃, the temperature of the third section of the screw is 200 ℃ and the temperature of the machine head is 200 ℃; setting the rotating speed of the single screw extruder to be 120r/min; the extrusion pressure of the machine head is set to be 25MPa. And after the temperature of each area of the single-screw extruder is stable, adding the granular material into the single-screw extruder from a feed inlet, and extruding and foaming through preset parameters to obtain the starch-based foaming board material.
6) Coating: mixing pectin and water at a ratio of 0.5:9.5, heating in a water bath at the temperature of 80 ℃ for 30min to prepare a polyvinyl alcohol aqueous solution; when the solution temperature is cooled to room temperature, mixing calcium peroxide and polyvinyl alcohol solution according to the ratio of 1:2, sufficiently mixing the components in a mass ratio to prepare an oxygen-releasing composite matrix; and (2) quickly and uniformly coating the oxygen release composite matrix on the surface of the starch-based foam board material, and controlling the mass ratio of the oxygen release composite matrix to the starch-based foam board material to be 1:2, preparing an active coating; and (3) drying the starch-based foaming board material with the active coating in a hot air circulation oven at 40 ℃ for 30min to finally obtain an active starch-based foaming board material V.
Example 5 starch-based foam Material VI
1) Nucleating agent pretreatment: drying calcium carbonate until the water content is 6%, and crushing the calcium carbonate to 70um;
2) Raw material blending: adding corn starch (88 wt%), cellulose (3.5 wt%), polyvinyl alcohol (1 wt%), water (1 wt%) and nucleating agent (calcium carbonate, 0.5 wt%) into a mixer by mass percent, and premixing for 5min at 150rpm/min; water (4 wt%) and plasticizer glycerol (2 wt%) were added and blended at 160rpm/min for 20min.
3) Rod (strip) like material preparation: the twin-screw extruder is set to be 9 temperature zones, which are respectively as follows: starting from a feed port, the temperature of a first section of the screw is 30 ℃, the temperature of a second section of the screw is 40 ℃, the temperature of a third section of the screw is 40 ℃, the temperature of a fourth section of the screw is 100 ℃, the temperature of a fifth section of the screw is 100 ℃, the temperature of a sixth section of the screw is 65 ℃, the temperature of a seventh section of the screw is 65 ℃, the temperature of an eighth section of the screw is 60 ℃ and the temperature of a ninth section of the screw is 60 ℃; setting the rotating speed of the screw to be 60rpm/min; the sample injection flow rate of water is 20ml/min, after the temperature of each area of the double-screw extruder is stable, the blend obtained in the step 2 is added into the double-screw extruder through a feeding device at the sample injection flow rate of 40L/h, and a continuous and uniform rod (strip) material is obtained through extrusion;
4) Pelletizing: the rod (strand) material was transported backward through a conveyor belt with an air-cooling device and cooled, and cut into pellets having a length of 5mm using a cutter at a rotation speed of 30 rpm/min.
5) Foaming: the water content of the prepared granular material is balanced to be 14 percent, and the screw rotating speed of the single screw extruder is adjusted to 150rpm/min; 3 temperature zones are set, which are respectively as follows: the temperature of the first section of the screw from the charging opening is 130 ℃, the temperature of the second section of the screw is 195 ℃, the temperature of the third section of the screw is 200 ℃ and the temperature of the machine head is 200 ℃; setting the rotating speed of the single screw extruder to be 120r/min; the extrusion pressure of the machine head is set to be 25MPa. And after the temperature of each area of the single-screw extruder is stable, adding the granular material into the single-screw extruder from a feed inlet, and extruding and foaming through preset parameters to obtain the starch-based foaming board material.
6) Coating: mixing polyvinyl alcohol and water according to the weight ratio of 0.5:9.5, heating in a water bath at the temperature of 80 ℃ for 30min to prepare a polyvinyl alcohol aqueous solution; when the solution temperature is cooled to room temperature, mixing calcium peroxide and polyvinyl alcohol solution according to the ratio of 1:2, sufficiently mixing the components in a mass ratio to prepare an oxygen release composite matrix; and rapidly and uniformly coating the oxygen release composite matrix on the surface of the starch-based foaming board material, and controlling the mass ratio of the oxygen release composite matrix to the starch-based foaming board material to be 1:2, preparing an active coating; and (3) drying the starch-based foaming board material with the active coating in a hot air circulation oven at 40 ℃ for 30min to finally obtain an active starch-based foaming board material VI.
Example 6
The activated starch-based foams II, III, IV obtained in examples 1-3 were tested for oxygen release behavior in an environment of 95% relative humidity. The oxygen evolution kinetics of the slow oxygen release starch based foam materials were tested by an OXYBABY headspace gas analyzer using a sealed vessel (volume 5.5 liters) with a hole (diameter 0.7 mm). Before measurement, 8.0 starch-based foaming material is put into a sealed container with 95% relative humidity, and oxygen is completely removed by taking pure nitrogen as background gas. The experimental group settings and the experimental results are shown in fig. 1, and the results in fig. 1 show that the active starch-based foaming material has different oxygen release rates and appropriate effective oxygen release amounts in the oxygen release composite coatings prepared from polyvinyl alcohol solutions with different concentrations in a 95% relative humidity environment. When the concentration of the polyvinyl alcohol aqueous solution is 3%, the oxygen release rate of the obtained active starch-based foaming material is maximum, and the accumulated effective oxygen release amount in 30 days is 5.58vol%. The oxygen release rate of the embodiment of the invention can better meet the requirements of fruit and vegetable fresh-keeping.
Example 7
In order to examine the influence of hydrophilic polymers (taking polyethylene glycol, pectin and polyvinyl alcohol as examples) on the mechanical properties of the prepared active starch-based foaming materials, the tensile strength, the elongation at break, the compressive strength and the recovery rate of the active starch-based foaming materials I, IV, V and VI obtained in the examples are tested. And testing the tensile property and the compressive property of the material by using a universal mechanical tester. The measuring method of the tensile property refers to GB/T1040.3-2006 determination of the tensile property of plastics; and during the compression performance test, applying axial pressure to the foaming material at the speed of 5mm/min, compressing to 50% of the thickness of the foaming material sample, then withdrawing the probe to the original working height, and recording the compression strength and the recovery rate of the foaming material. Each experiment was tested in 7 independent tests. Experimental group settings and experimental results are shown in table 1:
TABLE 1 variation of mechanical Properties of activated starch-based foamed materials
The results in Table 1 show that the tensile strength, elongation at break, compressive strength and recovery rate of the activated starch-based foam material I are respectively 1.82MPa, 19.34 percent, 4.55MPa and 94.00 percent; the tensile strength, the elongation at break, the compressive strength and the recovery rate of the activated starch-based foaming material VII are respectively 1.02MPa, 8.46 percent, 2.07MPa and 85.97 percent and are lower than those of other experimental groups. Although the oxygen release composite coating has a certain negative effect on the mechanical property of the active starch-based foaming material, possibly by the moisture in the oxygen release composite matrix, and the hydrophilic polymer molecular chain in the oxygen release composite matrix has a certain inhibiting effect on the deterioration of the mechanical property of the active starch-based foaming material, as can be seen from the test results, the worst active starch-based foaming material vii in the embodiment of the invention also has relatively good mechanical property, and when the hydrophilic polymer in the oxygen release composite matrix is polyvinyl alcohol, the tensile strength and the compressive strength of the obtained active starch-based foaming material iv are respectively 1.87MPa and 4.55MPa, which has certain comparative advantages.
Example 8
The change of atmosphere (O) in the storage environment of guava in the slow oxygen release type activated starch-based foam sheet during the simulated transportation (3 Hz X1 days) and storage (14 days) (25 ℃,95% RH) of guava was examined 2 And CO 2 ) And the effects of guava quality changes (respiration rate, entropy, and appearance characteristics). 1kg of guava and a total volume of 60cm x 30cm x 12mm of starch-based foam board were placed in each 5.5L of closed experimental environment. The experimental setup and experimental results are shown in table 2, table 3, and fig. 2.
TABLE 2 atmosphere Change in sealed guava freshness packages
TABLE 3 respiration Rate and respiratory entropy changes of guava
Table 2 results show for in-package O 2 The concentration of the active starch-based foaming board III is always maintained at about 2vol%, and the blank group and the starch-based foaming board I (comparative example) approach to 0 after 1 day; for CO 2 The concentration, active starch based foaming board group III was always less than 0.5vol%, and far less than the other two groups. The active starch-based foaming board III can balance the atmosphere in the guava package, and maintain a good atmosphere environment for the fresh-keeping storage of guava fruits.
The results in table 3 show that the respiratory entropy of guava in the blank group and starch-based foaming board group i gradually increases (> 1) with the increase of storage time, indicating the progress of anaerobic respiration of guava fruits. And the guavas in the active starch-based foaming board III group always have the respiratory entropy close to 1 and smaller respiratory rate, which shows that the active starch-based foaming board III can effectively regulate and control the respiratory metabolic mode of guavas fruits by maintaining a proper atmosphere environment. The test results of other examples are substantially the same as those of the activated starch based foamed board III and are not provided.
The method comprises the following steps of simulating transportation for 1-15 days, observing appearance characteristic changes of guava fruits contained in a starch-based foaming board I prepared in a comparative example 1 and an active starch-based foaming board III prepared in an example 2, and taking the guava fruits contained in a common carton as a blank group to obtain a guava fruit appearance characteristic change diagram 2, wherein the results in the diagram 2 show that the starch-based foaming board I and the active starch-based foaming board III can effectively reduce the mechanical damage of the skin of the guava fruits after simulated transportation (1 day) relative to the blank group, and the foaming material has an obvious buffering protection effect; in particular, compared with the starch-based foaming board I after 15 days, the active starch-based foaming board III can greatly inhibit the change of the color of the surface of the guava and the browning and the decay of fruits. Therefore, the active starch-based foaming board III has good buffer protection performance or air-conditioning function, and can effectively prolong the shelf life of guava fruits. The test results of other examples are substantially the same as those of the activated starch based foam board III and are not provided.
The method of carrying out the present invention has been described in detail, but this is merely an example for the convenience of understanding and should not be construed as limiting the scope of the present invention. Also, various equivalent changes or substitutions are possible for those skilled in the art according to the technical solution of the present invention and the description of the preferred embodiment thereof, but all such changes or substitutions shall fall within the protection scope of the claims of the present invention.
Claims (10)
1. An active starch-based foaming plate with a sustained and controlled oxygen release function is characterized in that the foaming plate is formed by coating a coating on an inner layer; the coating is an oxygen release composite, and the inner layer is a starch-based foaming board material; the oxygen release compound is prepared by dispersing calcium peroxide in a hydrophilic polymer solution, wherein the hydrophilic polymer is one or a mixture of more than two of pectin, starch, polyethylene glycol and polyvinyl alcohol; the starch-based foaming board material is prepared from starch, cellulose, polyvinyl alcohol, a nucleating agent, a foaming agent and a plasticizer.
2. The active starch-based foaming sheet material with the function of slowly and controllably releasing oxygen of claim 1, wherein the mass ratio of the oxygen release compound to the starch-based foaming sheet material is 1:2-4, and the corresponding thickness ratio is 1:10 to 20.
3. The active starch-based foaming sheet material with the function of sustained and controlled release of oxygen according to claim 1, wherein the mass ratio of the calcium peroxide to the hydrophilic polymer matrix is 1:1 to 4; the effective content of the calcium peroxide is 55-80%, wherein the content of the calcium hydroxide is 10-35%, and the content of the calcium carbonate is 1-10%;
the mass ratio of the hydrophilic polymer to the water in the hydrophilic polymer solution is 0.5-1:9.
4. The active starch-based foaming sheet material with the controlled and sustained oxygen release function according to claim 1, wherein the pectin has a galacturonic acid methyl esterification degree of 35-55%, a molecular weight of 10000-200000 Da, and is a light yellow powdered solid; the starch in the hydrophilic polymer is one or a mixture of more than two of corn starch, barley starch, wheat starch, potato starch and cassava starch; the molecular weight of the polyethylene glycol is 1500-3500 Da; the molecular weight of the polyvinyl alcohol is 150000-220000 Da, and the polyvinyl alcohol is white flocculent or powdery solid.
5. The active starch-based foaming board with the function of sustained and controlled release of oxygen according to claim 1, wherein the raw materials of the starch-based foaming board comprise:
6. the active starch-based foaming sheet material with the function of slowly and slowly controlling oxygen according to claim 5, wherein the starch is selected from one or a mixture of more than two of corn starch, barley starch, wheat starch, potato starch, pea starch and cassava starch;
the modified starch is selected from one or a mixture of more than two of corn starch, barley starch, wheat starch, potato starch, pea starch and cassava starch which are modified by etherification, esterification or crosslinking.
The molecular weight of the polyvinyl alcohol is 150000-220000 Da, and the polyvinyl alcohol is white flocculent or powdery solid.
The foaming agent is selected from one or two of water and sodium bicarbonate;
the nucleating agent is selected from one or more of calcium carbonate, microcrystalline cellulose and microcrystalline starch;
the plasticizer is selected from one or more of water, glycerol, sorbitol, xylitol, oleic acid and polyethylene glycol.
7. The active starch-based foaming board with the function of slowly and slowly controlling oxygen of claim 5, wherein the preparation method of the starch-based foaming board comprises the following steps:
s1, nucleating agent pretreatment: drying and crushing the nucleating agent, and controlling the water content in the nucleating agent to be below 7%;
s2, raw material blending: adding starch or modified starch, cellulose, polyvinyl alcohol, a foaming agent, a nucleating agent and a plasticizer into a mixer, and uniformly mixing to obtain a mixed material;
s3, preparing granular materials: extruding and granulating the powdery premix through a double-screw extruder to obtain granular materials;
s4, foaming: and (3) regulating the moisture of the granular material, and foaming the granular material through a single-screw extruder to obtain the starch-based foaming board material.
8. The active starch-based foaming sheet material with the function of sustained and controlled release of oxygen according to claim 5, wherein the drying process parameters of the nucleating agent in the step S1 are as follows: drying at 150-200 deg.C for 1.5-4 hr, and pulverizing to 50-70um;
in the step S2, the raw material blending is carried out for 5-20min at the speed of 100-200 rpm/min;
in the step S3, the length-diameter ratio of the double-screw extruder is 25-44, the screw rotating speed is 50-250rpm/min, the aperture of the die head is 2-4mm, the temperature range of each subarea is 30-120 ℃, the sample injection flow rate of the blend is 10-40L/h, and the sample injection flow rate of water is 20-50ml/min.
In step S4, the moisture of the granular materials is regulated to control the moisture content of the granular materials to be 13-18%; the length-diameter ratio of a single-screw extruder foamed by the single-screw extruder is 15-30, the screw rotating speed is 70-180r/min, the parameters of a sheet die head are that the thickness is 2-10mm, the length is 200-1000mm, the temperature range of each interval is set to be 120-200 ℃, and the rotating speed of the single-screw extruder is set to be 120-170 r/min; the extrusion pressure of the machine head is 20-35MPa.
9. The method for preparing the active starch-based foaming sheet material with the function of slowly and controllably releasing oxygen as claimed in any one of claims 1 to 8, wherein the hydrophilic polymer solution and the calcium peroxide are fully mixed to prepare an oxygen release composite; and uniformly coating the oxygen release compound on the surface of the starch-based foaming material, and drying to obtain the active starch-based foaming sheet material with the function of slowly and controllably releasing oxygen.
10. The use of the active starch-based foamed sheet with controlled and sustained oxygen release function according to any one of claims 1 to 8 in logistics transportation for modified atmosphere preservation of fruits and vegetables.
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| CN117004094A (en) * | 2023-09-01 | 2023-11-07 | 河南奥尼斯帝新材料有限公司 | Starch-based foaming composition, starch-based foaming product and preparation method thereof |
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