CN-121991416-A - Film oxygen absorbent master batch and preparation method thereof, oxygen absorbing film and preparation method thereof

Abstract

The invention discloses a film oxygen absorbent master batch and a preparation method thereof, an oxygen absorbing film and a preparation method thereof, wherein the master batch comprises 40-64% of an oxygen absorbent, 32-56% of a catalyst and 2-5% of an inorganic filler by taking the mass of the master batch as 100%, and the oxygen absorbent comprises an inclusion compound formed by mixing tea polyphenol and chitosan and anti-sepsis acid, wherein the mass ratio of the tea polyphenol to the chitosan to the anti-sepsis acid is 3:2-3:4. Compared with food antioxidants and preservatives, the oxygen absorbing film has high safety and no side effect, and the oxygen absorbing packaging material does not need to be directly added into food, and the added active oxygen absorbing substances can generate oxidation-reduction reaction with oxygen, so that the inorganic filler is filled to realize better oxygen absorbing effect, and the cost of the film can be reduced.

Inventors

• NI SHUANGYANG
• DONG MEIJUN
• REN HE
• CAO TINGTING
• WANG YURU
• GAO YUXIN
• WANG WEIZHONG
• LIU WENYONG
• ZHANG RUI
• FENG SIHAN

Assignees

• 中国石油天然气股份有限公司

Dates

Publication Date

20260508

Application Date

20241107

Claims (10)

1. 1. The film oxygen absorbent master batch is characterized by comprising 40% -64% of an oxygen absorbent, 32% -56% of a catalyst and 2% -5% of an inorganic filler, wherein the oxygen absorbent comprises an inclusion compound formed by mixing tea polyphenol and chitosan and anti-sepsis acid, and the mass ratio of the tea polyphenol to the chitosan to the anti-sepsis acid is 3:2-3:4.
2. 2. The thin film oxygen absorbent master batch according to claim 1, wherein the clathrate is prepared by dissolving tea polyphenol and chitosan in absolute ethanol, mixing and stirring uniformly.
3. 3. The thin film oxygen absorber masterbatch of claim 1 wherein the catalyst is an iron and/or copper salt.
4. 4. The thin film oxygen absorber masterbatch of claim 3 wherein the iron salt is FeCl 2 and/or Fe 2 (SO 4 ) 3 and the copper salt is CuCl 2 and/or CuSO 4 .
5. 5. The thin film oxygen absorber masterbatch of claim 1 wherein the inorganic filler is montmorillonite.
6. 6. The method for preparing the film oxygen absorbent master batch according to any one of claims 1 to 4, wherein the tea polyphenol-chitosan inclusion compound, the anti-sepsis acid, the catalyst and the inorganic filler are mixed with absolute ethyl alcohol, stirred for 2 to 3 hours at 30 to 50 ℃, cooled to room temperature after the completion, refrigerated and kept still until white powder is not precipitated any more, and then filtered in vacuum, washed and dried.
7. 7. The method for preparing a thin film oxygen absorber masterbatch according to claim 6 wherein the refrigeration temperature is 2-8 ℃.
8. 8. An oxygen-absorbing film comprising a poly-1-butene resin and the oxygen-absorbing master batch according to any one of claims 1 to 4, wherein the mass ratio of the poly-1-butene resin to the oxygen-absorbing master batch is 10 to 15:1.
9. 9. The oxygen absorbing film according to claim 8, wherein the film has a thickness of 10 to 60 μm.
10. 10. The method for producing an oxygen absorbing film according to claim 8 or 9, comprising the steps of: s1, mixing an oxygen absorbent master batch and poly-1-butene resin, and melting, extruding and cutting by a double-screw extruder to obtain granules; S2, casting the granules by a casting machine to prepare a film.

Description

Film oxygen absorbent master batch and preparation method thereof, oxygen absorbing film and preparation method thereof Technical Field The invention relates to the technical field of oxygen-absorbing packaging materials, in particular to a film oxygen-absorbing agent master batch and a preparation method thereof, an oxygen-absorbing film and a preparation method thereof. Background The existence of oxygen is considered as one of the main factors causing food deterioration, and the method for preventing oxygen from damaging food is widely used at present, mainly by utilizing a barrier packaging material and combining the application of packaging technologies such as vacuum packaging, air-filled packaging (air-change packaging) and the like, the concentration of oxygen in the package is reduced by vacuumizing or filling inert gas, and the barrier property of the packaging material is utilized to prevent oxygen outside the package from entering the packaging bag, but the two technologies can not completely remove the oxygen in the package, a small amount of oxygen (0.1% -2%) still remains in the package, and the free oxygen can interact with food to finally cause adverse effect on the quality of the food. Deoxidizing packaging technology has also been developed, in which deoxidizing agents (also called oxygen absorbing agents or deoxidizing agents), such as reduced iron powder, are placed in the barrier packaging, and the reaction of the deoxidizing agents and oxygen is utilized to reduce the concentration of oxygen in the packaging, so that the harm of oxygen to food is effectively prevented, and the purpose of prolonging the shelf life of the food is achieved. The oxygen absorbent is most widely applied in japan, and according to investigation, tens of companies have produced different types and varieties of oxygen absorbent in japan. Compared with foreign countries, the research on oxygen absorption packaging materials in China is started later and limited to some theoretical researches, and no mature commodity application exists at present. The deoxidizing packaging technology has been successfully applied to packaging common foods such as moon cakes, but the conventional deoxidizing packaging technology is used for placing deoxidizing agents in the packaging, so that the packaging process is complicated, the packaging cost is increased, the problem of incorrect eating of the deoxidizing agents by consumers can occur, and certain specific commodities are not suitable for using conventional deoxidizing packaging, such as beverages, besides oxygen entering from a top gap in filling and oxygen entering through packaging materials in a storage process, and oxygen dissolved by the beverage, and the commodities are not suitable for adopting the packaging technology for placing the deoxidizing agents. The solution to these problems is to develop a novel barrier packaging material, and an oxygen-absorbing barrier packaging film has been developed. The oxygen absorption type barrier packaging film can not only block oxygen in the atmosphere from entering the packaging bag, but also enable easily oxidized components in the film to react with oxygen in the packaging bag, so that the oxygen concentration in the packaging bag is reduced to a level of 0.01%, and the oxygen absorption type barrier packaging film is used for food packaging and has better effect than the traditional inert barrier packaging film. Oxygen absorption of oxygen absorbing packaging films is usually achieved by means of an "oxygen absorbing layer", also referred to as "active layer", i.e. a plastic film layer containing an easily oxidizable substance, which usually consists of an "oxygen absorbing substance" (oxidizable substance) and a reaction promoter (catalyst). For example, patent CN110461600B discloses a laminate for packaging and a package using the same, and a method for treating the content of the package, wherein the laminate comprises an oxygen absorbing layer and a skin layer laminated on at least one surface of the oxygen absorbing layer, the oxygen absorbing layer comprises polyolefin and cerium oxide having oxygen deficiency, and the skin layer comprises a non-cyclic olefin polymer and a cyclic olefin polymer, and the oxygen absorbing film is provided with a moderately controlled oxygen absorbing speed. However, the oxygen absorbing layer is not added with a catalytic auxiliary agent, so that the oxygen absorbing rate cannot be better accelerated, and the oxygen absorbing layer is catalyzed. Patent CN116457411a discloses an oxygen-absorbing resin composition, an oxygen-absorbing film, an oxygen-absorbing multilayer film and a cover material. The oxygen-absorbing resin composition contains polyolefin, iron powder, titanium oxide and calcium oxide, and provides an oxygen-absorbing resin composition and an oxygen-absorbing film which are excellent in oxygen absorbability and further excellent in light-shielding property and odor-supp