CN-122015385-A - Antibacterial fresh-keeping refrigerator based on composite material and preparation method thereof

CN122015385ACN 122015385 ACN122015385 ACN 122015385ACN-122015385-A

Abstract

The invention discloses an antibacterial fresh-keeping refrigerator based on composite materials and a preparation method thereof, which relate to the technical field of household appliances and food packaging, wherein the antibacterial fresh-keeping refrigerator takes composite materials consisting of nano copper, graphene and biochar as core functional auxiliary agents, the composite materials are added into a preparation base material of a refrigerator high polymer component as the functional auxiliary agents, the composite materials take the biochar as a carrier, the graphene and the nano copper particles are loaded, the biochar provides high specific surface area and adsorptivity, the graphene enhances conductivity and provides adhesion mechanical strength for nano copper, promotes electron transfer, activates nano copper, generates active oxygen and releases copper ions through photocatalysis, damages a microbial structure, and the copper ions are bound by a cage wall formed by the graphene to form a potential difference, so that the antibacterial capability of the refrigerator high polymer component is further improved, the antibacterial activity, the stability and the dispersibility are improved by the synergistic effect of the three components, and the refrigerator high polymer component is prepared through processes such as melt blending, extrusion, injection molding and the like.

Inventors

YANG YOUCAI
LIANG KUN
YU JINGJING
LI FANGFANG
GAO LEI
YUE CHAOGANG
LIAN KUN

Assignees

青岛新材料科技工业园发展有限公司
青岛炯晟新材料科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260105

Claims (10)

1. The antibacterial fresh-keeping refrigerator based on the composite material is characterized in that the antibacterial fresh-keeping refrigerator takes a composite material consisting of nano copper, graphene and biochar as a core functional auxiliary agent, the composite material takes the biochar as a carrier, the graphene and nano copper particles are loaded, the biochar avoids agglomeration of the nano copper, the dispersibility and electronic conduction of the graphene are enhanced, and the adhesive mechanical strength is provided for the nano copper; the high polymer component of the refrigerator comprises an inner container, an air duct, a fan, a drawer and a lampshade by being integrated into the high polymer component of the refrigerator; The refrigerator further includes the following parts: An intelligent environment monitoring system for temperature and humidity, ethylene concentration and an optical sensor; The intelligent control system is linked with the intelligent mobile phone APP through the Internet of things technology; an automatic control system capable of automatically adjusting temperature, humidity and antibacterial function according to the environmental data in the refrigerator; An antibacterial fresh-keeping material based on a nano copper, graphene and biochar composite material is embedded into a high polymer component of a refrigerator, and the composite material is used for resisting bacteria, removing ethylene, absorbing moisture and removing peculiar smell; the intelligent control system automatically adjusts the temperature, humidity and antibacterial effect of the refrigerator according to the following comprehensive objective function, and the formula is as follows: Wherein: a multidimensional function based on temperature (T), humidity (H) and ethylene concentration (C) as an energy efficiency function; Deviation of the target temperature from the actual temperature; deviation of the target humidity and the actual humidity; Is a function of antimicrobial activity and depends on the behavior of the composite material in temperature and humidity environments; , , , the weight coefficient of each parameter is respectively used for representing the importance of energy efficiency, temperature and humidity regulation and antibacterial effect.
2. The antibacterial fresh-keeping refrigerator based on the composite material according to claim 1, wherein the biochar is used as a carrier phase and is obtained by acidizing biomass under the condition of limiting oxygen, and the biochar captures ethylene gas, moisture and odor molecules; The graphene is used as an enhancement phase and compounded in a graphene oxide form, graphene oxide grows on the surface of biochar through a hydrothermal method to form a stable three-dimensional conductive network, the graphene promotes electron transfer, and the photocatalytic activity of the nano copper is activated; The nano copper is used as an active phase, a chemical reduction method is adopted to control copper load and anchor the nano copper on the surfaces of graphene and biochar carriers, active oxygen and copper ions are released through photocatalysis to destroy microbial cell membranes and DNA, the nano copper excites photogenerated electrons under visible light to produce active oxygen through graphene transmission, meanwhile, cu 2+ destroys the cell membranes, and Cu 2+ is bound by a 'cage wall' formed by the graphene to form a potential difference, so that the antibacterial capability of the nano copper is further improved.
3. The antibacterial fresh-keeping refrigerator based on the composite material of claim 1, wherein the polymer component inner container, the air duct, the fan, the drawer and the lamp shade are all made of engineering plastics as base materials, and 1-10wt% of composite material consisting of nano copper, graphene and biochar is added; the composite material is used as a functional auxiliary agent to be added into the polymer components of the refrigerator, and each polymer component is processed and prepared through a melt blending and extrusion molding process.
4. The antibacterial fresh-keeping refrigerator based on the composite material according to claim 3, wherein the base material of the liner is made of a blend Alloy (APS) of high impact polystyrene HIPS or PP modified HIPS through extrusion and vacuum adsorption; The base materials of the air duct and the fan are high impact polystyrene HIPS or ABS resin, and the air duct and the fan are formed by injection molding; the base materials of the drawer and the lampshade are transparent materials, and specifically polyethylene terephthalate PET or copolymers PETG and PCTG thereof.
5. The antibacterial fresh-keeping refrigerator based on the composite material of claim 3, wherein functional additives are added to the polymer component, and the functional additives comprise a toughening agent and an antioxidant; the toughening agent is specifically thermoplastic elastomer of SEBS, SBS or POE, the addition amount of the toughening agent is 5-10 parts, and the addition amount of the antioxidant is 0.5-1 part.
6. The antibacterial fresh-keeping refrigerator based on the composite material of claim 3, wherein the polymer components are subjected to special treatment, and a chitosan or sodium carboxymethyl cellulose coating can be modified on the surfaces of the polymer components.
7. The preparation method of the antibacterial fresh-keeping refrigerator based on the composite material according to any one of claims 1 to 6 is characterized by comprising the following preparation processes: Step S1, synthesizing a ternary composite material; s2, processing a high polymer component of the refrigerator; s3, simulating an environment fresh-keeping test; The step S1 comprises the following steps: Step S101, preparing biochar; step S102, graphene loading; step S103, anchoring nano copper; the step S2 comprises the following steps: Step S201, mixing materials according to the weight parts; Step S220, melt blending extrusion; Step S203, injection molding and compression molding; And S204, surface coating modification.
8. The preparation method of the antibacterial fresh-keeping refrigerator based on the composite material, which is characterized in that S101, in the preparation process of the biochar, biomass is carbonized for 2 hours under the temperature condition of 500 ℃ to obtain primary biochar, and the biomass is selected from straw, wood or bamboo powder; Then removing ash by acid washing, and washing the biochar by hydrochloric acid or sulfuric acid to obtain a porous biochar carrier; s102, uniformly mixing a biochar carrier and graphene oxide dispersion liquid in the graphene loading process, and placing the mixture in a high-pressure reaction kettle, wherein the concentration of the graphene oxide dispersion liquid is 10mg/mL; Carrying out hydrothermal reaction for 12 hours at the temperature of 180 ℃, wherein in the process, graphene oxide is partially reduced and self-assembled and is firmly attached to the porous surface and the pore canal of the biochar to form a three-dimensional composite carrier, so that graphene uniformly grows on the surface of the biochar to form the biochar and the graphene carrier; S103, adding quantitative CuSO 4 solution into biochar and graphene carriers in the nano copper anchoring process, stirring to enable the solution to be fully adsorbed, and controlling the concentration to enable the load capacity of the final CuSO 4 solution to reach 5wt%; And under the stirring action, dropwise adding a reducing agent sodium borohydride solution to perform a reduction reaction, reducing the adsorbed Cu 2+ ions into zero-valent nano copper particles, firmly anchoring the nano copper particles on the surface of graphene, and finally centrifuging, washing and collecting a reaction product, and drying to obtain the final powdery composite material.
9. The preparation method of the antibacterial fresh-keeping refrigerator based on the composite material of claim 7, wherein S201 is characterized in that in the mixing treatment process, the specific materials comprise a polymer base material, a composite material, a toughening agent and an antioxidant, wherein the specific materials are mixed according to a specified weight part; Wherein the polymer base material is engineering plastic, specifically HIPS, APS or ABS, the ratio of the polymer base material is 100 parts, the ratio of the composite material is 5 parts, the toughening agent is thermoplastic elastomer, specifically SBS, SEBS or POE, the ratio of the toughening agent is 8 parts, the ratio of the antioxidant is 0.5 part, and all materials are put into a high-speed mixer; s202, feeding the mixed materials into a double-screw extruder, and extruding and granulating by sections at 190-220 ℃ through the double-screw extruder, wherein six sections of temperature control are adopted; the strip-shaped objects extruded by the double-screw extruder are cut into uniform composite plastic master batches by a granulator after being water-cooled and air-dried; s203, manufacturing a refrigerator liner, an air duct, a fan, a drawer and a lampshade part, specifically adopting a molding process of injection molding and vacuum adsorption molding to realize molding of different types of polymer parts, and finally assembling the prepared molded polymer parts; The method comprises the steps of performing injection molding on a complex structural component for an air duct and a fan, specifically adding composite plastic master batches into a hopper of an injection molding machine, heating and plasticizing, injecting the composite plastic master batches into a closed mold cavity at high pressure, and opening the mold after pressure maintaining and cooling to obtain the component; the vacuum adsorption molding is used for molding the liner plate, the liner plate is formed into a flat plate by an extruder, then the plate is heated and softened, the heated and softened plate is placed on a refrigerator liner mold, the adsorption plate is tightly adsorbed on the surface of the mold by the combination of mold adsorption and vacuumizing, and the liner part with a specified shape is obtained after cooling; and S204, applying a chitosan or sodium carboxymethyl cellulose intelligent response coating on the surface of the formed part through a spraying process.
10. The method for preparing the antibacterial fresh-keeping refrigerator based on the composite material, which is disclosed in claim 7, is characterized in that S3, in a simulated refrigerator environment, the drawer added with the material performs fresh-keeping test on antibacterial rate of escherichia coli and staphylococcus aureus, the temperature of the simulated refrigerator environment is 4 ℃, and the humidity is 85%.

Description

Antibacterial fresh-keeping refrigerator based on composite material and preparation method thereof Technical Field The invention relates to the technical field of household appliances and food packaging, in particular to an antibacterial fresh-keeping refrigerator based on a composite material and a preparation method thereof. Background The environment in which human beings live is largely provided with various pathogenic microorganisms represented by bacteria and viruses, bacterial infection or inflammation is one of main causes of illness and even death of human beings, a great amount of cost expenditure is added to the medical and health field of all countries in the world, along with the continuous development of human history, the medical and health problems such as bacterial and virus infection are one of the serious challenges facing human beings, and antibacterial materials (ABP) generally refer to functional materials which have the capability of killing or inhibiting the growth and reproduction of harmful bacterial microorganisms, wherein the antibacterial Agents (AG) are core components in antibacterial materials which are sensitive to pathogenic microorganisms and are roughly divided into three types according to the source, chemical composition and the like; The traditional refrigerator has the advantages that the traditional refrigerator adopts silver inorganic antibacterial agent or organic antibacterial agent, but has high cost, poor durability and potential toxicity, the silver antibacterial agent is easy to oxidize and inactivate, heavy metal ions can migrate to food, the organic antibacterial agent has poor heat resistance and is easy to decompose and lose efficacy, in addition, bacteria and mold can easily grow in a high-humidity environment in the refrigerator, common plastic parts have no active antibacterial capability, in recent years, the nano copper/carbon-based composite material has great attention on low cost and strong antibacterial property, but the nano copper is easy to agglomerate and oxidize, the compatibility with a plastic matrix is poor, and the graphene and the biochar are used as carriers to improve the dispersibility and the stability of the nano copper, but the composite material has the problems of uniform dispersion, processing adaptability and long-lasting property in the complex parts of the refrigerator. Disclosure of Invention The invention provides an antibacterial fresh-keeping refrigerator based on a composite material and a preparation method thereof, which can effectively solve the problems that the prior proposal adopts a silver inorganic antibacterial agent or an organic antibacterial agent in the prior art, but has high cost, poor durability and potential toxicity, nano copper is easy to agglomerate and oxidize, the compatibility with a plastic matrix is poor, and the dispersibility and the stability of the nano copper can be improved by taking graphene and biochar as carriers, but the composite material has the problems of uniform dispersion, processing adaptability and long-acting property in complex parts of the refrigerator. The invention provides a composite material-based antibacterial fresh-keeping refrigerator, which takes a composite material consisting of nano copper, graphene and biochar as a core functional auxiliary agent, takes the biochar as a carrier for loading the graphene and nano copper particles, prevents the nano copper from agglomerating, enhances the dispersibility and the electronic conduction of the graphene, and provides the nano copper with adhesion mechanical strength; the high polymer component of the refrigerator comprises an inner container, an air duct, a fan, a drawer and a lampshade by being integrated into the high polymer component of the refrigerator; The refrigerator further includes the following parts: An intelligent environment monitoring system for temperature and humidity, ethylene concentration and an optical sensor; The intelligent control system is linked with the intelligent mobile phone APP through the Internet of things technology; an automatic control system capable of automatically adjusting temperature, humidity and antibacterial function according to the environmental data in the refrigerator; An antibacterial fresh-keeping material based on a nano copper, graphene and biochar composite material is embedded into a high polymer component of a refrigerator, and the composite material is used for resisting bacteria, removing ethylene, absorbing moisture and removing peculiar smell; the intelligent control system automatically adjusts the temperature, humidity and antibacterial effect of the refrigerator according to the following comprehensive objective function, and the formula is as follows: Wherein: a multidimensional function based on temperature (T), humidity (H) and ethylene concentration (C) as an energy efficiency function; Deviation of the target temperature from the actual temperature; devi