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Bio-macromolecular film filled with light calcium carbonate in situ and application of bio-macromolecular film in oily food and medicine packaging

A technology of light calcium carbonate and biological macromolecules, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of cumbersome process, wide particle size distribution, unstable properties, etc., and achieve simple preparation method, compact interface, and easy promotion Effect

Active Publication Date: 2021-06-22
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology describes how certain chemical substances can be combined together with other materials like CaCO3 or another type of material called CGM for creation of effective structures such as nanocomposites. These compositions have unique characteristics due to their ability to adjust calcium ion concentration within specific ranges without losing any part of them altogether. By combining different types of compounds together they make up an organic matrix containing many atoms of calciolite - which makes it hard but flexible enough to use in various applications where strengthening structural components are needed. Overall, this new approach allows us to efficiently control calcium content inside specialized matrices while maintaining desired physical attributes.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the performance of various types of plastic products without compromising their quality. Current methods involve adding chemical agents like acids or bases during manufacturing processes, but these have limitations due to weaknesses associated therewith. To overcome them, new compositions containing modified forms of chitin were developed. However, current techniques require complicated steps involving multiple reagents, leading to increased costs compared to traditional ways.

Method used

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Effect test

preparation example Construction

[0031] A method for preparing a biomacromolecular film filled with light calcium carbonate in situ, comprising:

[0032] In the mixed solution of N-hydroxypropyl-3-trimethyl chitosan (HTCC) and carboxymethylcellulose (CMC), first add Ca 2+ , then add CO 3 2- , prepare light calcium carbonate in situ; then add plasticizer to form a film to obtain a biological macromolecular film.

[0033] In some embodiments, when preparing light calcium carbonate, [Ca 2+ ]and 5-20mmol / L, [Ca 2+ ] / 1 / 1, the aging time is 2-6h, the electromagnetic stirring speed is 300-1200rpm, and the temperature is 25-60°C.

[0034] In some embodiments, the mass percent concentration of CMC in the film-forming solution is 1-3%, m HTCC / m CMC 1 / 10-5 / 10, the amount of polyvinyl alcohol m PVA / (m CMC +m HTCC ) is 20-30%, the consumption of light calcium carbonate m CaCO3 / (m CMC +mHTCC ) is 0.17-0.68%.

Embodiment 1

[0042] 1. Configuration of biomacromolecule mixed solution

[0043] N-hydroxypropyl-3-trimethyl chitosan (HTCC) and carboxymethyl cellulose (CMC) were respectively prepared with 4% mother liquors, and the dissolution was accelerated by electromagnetic stirring in a water bath at 60°C. The mother liquor can be used after standing at room temperature for 12 hours.

[0044] 2. Configuration of calcium chloride and sodium carbonate mother liquor

[0045] At room temperature, accurately weigh 1.11g of calcium chloride solid, dissolve it and dilute to volume in a 200mL volumetric flask, then filter with qualitative filter paper to obtain a calcium chloride mother liquor with a concentration of 50mmol / L. The same method prepares the sodium carbonate mother liquor of identical concentration. Leave to stand for 12 hours at room temperature before use.

[0046] 3. Regulation and preparation of light calcium carbonate

[0047] In the experiment of adjusting and preparing light calciu...

Embodiment 2

[0062] 1. The difference with Example 1 is: the concentration of carboxymethyl cellulose is 1% by mass.

[0063] 2.HTCC / CMC / CaCO 3 / PVA film properties

[0064] The thermal decomposition temperature of light calcium carbonate / natural macromolecular film is 276.7℃.

[0065] The breaking strength of the light calcium carbonate / natural macromolecular film is 20MPa, and the breaking elongation is 12%.

[0066] The bactericidal and antibacterial properties of light calcium carbonate / natural polymer film, the diameter of the inhibition zone for Staphylococcus aureus is 0.9cm, and the diameter of the inhibition zone for Escherichia coli is 0.86cm.

[0067] The water vapor transmission rate of light calcium carbonate / natural polymer film is 70gm·m -2 d -1 (relative humidity 90%, 37°C).

[0068] The transmittance of light calcium carbonate / natural polymer film to peanut oil is 0.95g / (m -2 d -1 ) (37°C).

[0069] The whiteness of light calcium carbonate / natural polymer film is 9...

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Abstract

The invention belongs to the technical field of films, and relates to a bio-macromolecular film filled with light calcium carbonate in situ and application of the bio-macromolecular film in oily food and medicine packaging. The method comprises the following steps: firstly adding Ca < 2 + > into a mixed solution of N-hydroxypropyl-3-trimethyl chitosan HTCC and carboxymethyl cellulose CMC, and then adding CO3 < 2-> to prepare light calcium carbonate in situ; and adding a plasticizer, and forming a film to obtain the bio-macromolecular film. The chitosan/cellulose macromolecular film filled with light calcium carbonate has strong antibacterial property and mechanical property, low water and oil permeability, zero cytotoxicity and proper biodegradation period.

Description

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Claims

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Application Information

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Owner QILU UNIV OF TECH
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