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CN-122008674-A - Fresh-keeping cloth based on micro-nano mineral hydroxyl anions and application thereof

CN122008674ACN 122008674 ACN122008674 ACN 122008674ACN-122008674-A

Abstract

The invention belongs to the technical field of food preservation, and particularly relates to a preservation cloth based on micro-nano mineral hydroxyl anions and application thereof, wherein the preservation cloth comprises a base layer, a functional layer, a slow-release and release-promoting layer and a protective layer which are sequentially arranged from bottom to top, the base layer is cotton-flax blended cloth or bamboo fiber cloth, the gram weight of the functional layer is 80-120g/m 2 , and the functional layer comprises, by weight, 20-40 parts of micro-nano mineral composite powder, 40-60 parts of aqueous polyurethane emulsion, 2-4 parts of a dispersing agent, 3-5 parts of a toughening agent, 1-3 parts of an antibacterial auxiliary agent and 10-20 parts of deionized water. The invention combines the composite structure of the functional layer and the slow-release and release-promoting layer by adopting the micro-nano mineral composite powder and the dispersing agent with specific proportion, has the effect of realizing the efficient and uniform release of hydroxyl anions, and simultaneously prolongs the release period by means of the loading effect of the slow-release and release-promoting layer, thereby thoroughly solving the problem of unstable fresh-keeping effect caused by small release amount of anions, short period and insufficient local concentration in the prior art.

Inventors

  • QIU WENHAO

Assignees

  • 象行生物科技(无锡)有限公司

Dates

Publication Date
20260512
Application Date
20260206

Claims (10)

  1. 1. The fresh-keeping cloth based on the micro-nano mineral hydroxyl anions is characterized by comprising a base layer (40), a functional layer (30), a slow-release and release-promoting layer (20) and a protective layer (10) which are sequentially arranged from bottom to top; The base layer (40) is cotton-flax blended cloth or bamboo fiber cloth, and the gram weight is 80-120g/m 2 ; the functional layer (30) comprises, by weight, 20-40 parts of micro-nano mineral composite powder, 40-60 parts of aqueous polyurethane emulsion, 2-4 parts of dispersing agent, 3-5 parts of toughening agent, 1-3 parts of antibacterial auxiliary agent and 10-20 parts of deionized water; the slow-release and release-promoting layer (20) comprises, by weight, 5-10 parts of a chitosan/montmorillonite composite slow-release agent, 20-30 parts of an aqueous acrylic emulsion and 10-15 parts of deionized water; the protective layer (10) is a breathable waterproof film, and the breathable rate is 500-800g/m 2 .24 hours.
  2. 2. The fresh-keeping cloth based on micro-nano mineral hydroxyl anions according to claim 1, wherein the weight ratio of cotton fibers to fibrilia in the cotton-fibrilia blended cloth of the base layer (40) is 7:3.
  3. 3. The fresh-keeping cloth based on micro-nano mineral hydroxyl anions according to claim 1, wherein the micro-nano mineral composite powder is obtained by mixing tourmaline powder, tourmaline powder and diatomite powder according to a weight ratio of 3:2:1 and then crushing the mixture to a particle size of 50-200nm through air flow.
  4. 4. The preservative cloth based on micro-nano mineral hydroxyl anions according to claim 1, wherein the dispersing agent is sodium polyacrylate or polyethylene glycol.
  5. 5. The micro-nano mineral hydroxyl anion-based fresh-keeping cloth according to claim 1, wherein the toughening agent is epoxidized soybean oil or dibutyl phthalate.
  6. 6. The preservative cloth based on micro-nano mineral hydroxyl anions according to claim 1, wherein the antibacterial auxiliary agent is nano silver powder or zinc oxide powder, and the particle size is 20-50nm.
  7. 7. The preservative cloth based on micro-nano mineral hydroxyl anions according to claim 1, wherein the chitosan/montmorillonite composite slow release agent is obtained by mixing chitosan and montmorillonite according to a weight ratio of 2:1, performing ultrasonic dispersion and stirring reaction, drying and grinding to a particle size of 100-200 nm.
  8. 8. The preservative cloth based on micro-nano mineral hydroxyl anions according to claim 1, wherein the breathable waterproof membrane is a polytetrafluoroethylene breathable membrane or a polyurethane breathable membrane.
  9. 9. The preservative cloth based on micro-nano mineral hydroxyl anions and application thereof according to claim 3, further comprising a preparation method, specifically comprising the following steps: S1, preparing micro-nano mineral composite powder, namely mixing tourmaline powder, tourmaline powder and diatomite powder in proportion, putting the mixture into an air flow pulverizer, and pulverizing the mixture under the pressure of 0.6-0.8MPa to obtain the micro-nano mineral composite powder with the particle size of 50-200 nm; S2, preparing functional slurry, namely adding a dispersing agent into deionized water, uniformly stirring, adding micro-nano mineral composite powder, and dispersing at a high speed for 30-60min at a rotating speed of 2000-3000r/min to obtain a mineral dispersion liquid; S3, performing composite molding, namely uniformly coating functional slurry on one side surface of the base layer (40) with the coating amount of 20-30g/m 2 , and drying at 80-100 ℃ for 15-20min to obtain the base layer (40) of the composite functional layer (30); S4, preparing and coating a slow-release and release-promoting slurry, namely adding a chitosan/montmorillonite composite slow-release agent into deionized water, stirring and dispersing for 20-30min at the rotating speed of 1500-2000r/min, adding aqueous acrylic emulsion, continuously stirring for 30-40min to obtain the slow-release and release-promoting slurry, uniformly coating the slow-release and release-promoting slurry on the surface of a functional layer (30), and drying for 15-20min at the temperature of 70-80 ℃ to form a slow-release and release-promoting layer (20); S5, finally compounding, namely compounding the protective layer (10) on the surface of the slow-release accelerating layer (20), and performing hot press molding to obtain a finished product of the fresh-keeping cloth, wherein the hot press temperature is 130-140 ℃, the pressure is 0.3-0.5MPa, and the time is 3-5min.
  10. 10. The application of the fresh-keeping cloth based on the micro-nano mineral hydroxyl anions is characterized by comprising the fresh-keeping cloth based on the micro-nano mineral hydroxyl anions according to claims 1-9, wherein the fresh-keeping cloth is applied to the fresh keeping of fruits and vegetables, fresh meat, cooked food or seafood, and the application mode comprises directly wrapping food, cutting into a specific shape to cover the surface of the food, and manufacturing a fresh-keeping bag or a fresh-keeping box lining.

Description

Fresh-keeping cloth based on micro-nano mineral hydroxyl anions and application thereof Technical Field The invention relates to the technical field of food preservation, in particular to a preservation cloth based on micro-nano mineral hydroxyl anions and application thereof. Background The food preservation is a key link for guaranteeing the food quality, prolonging the food shelf life and reducing the food waste, and is widely applied to a plurality of scenes such as household daily life, catering industry, fresh electric business, cold chain logistics and the like. The current mainstream food preservation technology mainly comprises physical preservation (such as refrigeration, freezing and vacuum packaging), chemical preservation (such as preservative and preservative), natural preservative preservation and the like. The physical preservation method can delay food deterioration to a certain extent, but has the problems of high energy consumption, strong equipment dependence and incapability of fundamentally inhibiting microorganism breeding, and the defects of easy damage of cell walls and water loss of fruit and vegetable foods, influence on taste and nutritive value caused by refrigeration and freezing, the chemical preservation method realizes preservation by adding artificial synthetic preservative, has obvious preservation effect, but has potential food safety risk, can cause harm to human health after long-term intake, gradually reduces the acceptance of chemical additives by consumers, and has the defects of higher safety, high cost, short preservation period, unstable preservation effect and the like of natural preservative (such as plant extracts, probiotics and the like) which are common, and difficult to meet the large-scale and long-time preservation requirement. Based on the current situation, the development of the fresh-keeping material with high safety, good fresh-keeping effect, moderate cost, convenient use and wide application range becomes a research hotspot in the industry. The hydroxyl anions have strong oxidizing property, can destroy the cell membrane structure of microorganisms (bacteria, mold, saccharomycetes and the like), inhibit the metabolism and propagation of the microorganisms, can adsorb odor molecules in the air and realize deodorizing function, and can regulate the environmental humidity, reduce the water loss of foods, delay the respiration of fruits and vegetables and reduce the loss of nutritional ingredients. The micro-nano mineral material (such as tourmaline, diatomite and the like) has natural hydroxyl anion release performance, and is wide in source, low in cost and high in safety, and the micro-nano mineral material is applied to the preparation of the fresh-keeping material, so that the defects of the existing fresh-keeping technology are hopeful to be overcome. Although the application of hydroxyl anions and micro-nano mineral materials in the field of preservation has significant advantages, the related technology still has the following core problems: 1. The hydroxyl anion release efficiency is low, mineral particles in the existing mineral-containing fresh-keeping material are mostly of conventional particle size, the specific surface area is small, the release amount of the hydroxyl anions is small, the release period is short, the long-time stable fresh-keeping effect is difficult to achieve, meanwhile, the mineral particles are unevenly dispersed in the material, the problem of insufficient local anion concentration is easy to occur, and the fresh-keeping effect is unstable. 2. The mechanical property and the fresh-keeping property of the fresh-keeping cloth are difficult to be compatible, if the adding amount of the micro-nano mineral particles is simply increased, the flexibility of the fresh-keeping cloth is reduced, the fresh-keeping cloth is easy to break, the service life is shortened, the repeated use requirement cannot be met, and if the adding amount is reduced, the fresh-keeping effect is greatly reduced. 3. The existing mineral fresh-keeping materials have the functions of bacteriostasis and fresh keeping, cannot realize multiple functions of moisturizing, deodorizing, delaying fruit and vegetable respiration and the like, and cannot meet the diversified fresh-keeping requirements of different types of foods (such as fresh meat, fruits and vegetables, cooked foods and the like). 4. The application scene is limited, the existing fresh-keeping materials are mostly disposable films or sheets, wastes are easy to generate after the fresh-keeping materials are used, the fresh-keeping materials are not environment-friendly, the shape is fixed, foods with different shapes and sizes are difficult to adapt, the use convenience is poor, and the fresh-keeping materials are not particularly suitable for flexible use in scenes such as household daily life, catering industry and the like. Disclosure of Invention In order to solve the technical problems,