阅读说明：本技术 一种具有保鲜功能的包装用纸及其制备方法 (Packaging paper with fresh-keeping function and preparation method thereof ) 是由 何涛 谢晓清 管仁贵 韩艳阳 刘珊珊 于 2019-11-12 设计创作，主要内容包括：本发明涉及一种具有保鲜功能的包装用纸及其制备方法。该制备方法步骤包括：(1)将滤纸在无机溶胶里浸渍2秒～24小时,取出,常温下自然晾干；(2)重复所述步骤(1)的浸渍2～15次；再浸在高锰酸钾溶液里1～5min,取出,烘干,得到包装用纸。本发明选用滤纸作为基材,由于滤纸的主要成分是纤维,表面有较多的孔结构,增加了活性组分的负载量；利用无机溶胶-凝胶方法制备的溶胶对滤纸纤维进行表面包覆处理,使滤纸纤维的表面完全被溶胶致密包裹,阻止滤纸纤维被高锰酸钾氧化；再将经溶胶处理的滤纸负载活性组分高锰酸钾。本发明保留了滤纸的二维片层结构,将果蔬完全包裹起来,提高乙烯脱除效率。(The invention relates to packaging paper with a fresh-keeping function and a preparation method thereof. The preparation method comprises the following steps: (1) dipping the filter paper in the inorganic sol for 2 seconds to 24 hours, taking out, and naturally drying at normal temperature; (2) repeating the dipping of the step (1) for 2-15 times; and then soaking in a potassium permanganate solution for 1-5 min, taking out, and drying to obtain packaging paper. According to the invention, the filter paper is selected as the base material, and as the main component of the filter paper is the fiber, the surface of the filter paper has more pore structures, the loading capacity of the active component is increased; carrying out surface coating treatment on the filter paper fiber by using the sol prepared by an inorganic sol-gel method, so that the surface of the filter paper fiber is completely and compactly wrapped by the sol, and the filter paper fiber is prevented from being oxidized by potassium permanganate; then the filter paper treated by the sol is loaded with an active component potassium permanganate. The invention keeps the two-dimensional lamellar structure of the filter paper, completely wraps the fruits and vegetables and improves the ethylene removal efficiency.)

1. A preparation method of packaging paper with a fresh-keeping function is characterized by comprising the following steps:

(1) dipping the filter paper in the inorganic sol for 2 seconds to 24 hours, taking out, and naturally drying at normal temperature;

(2) repeating the dipping of the step (1) for 2-15 times; and then soaking in a potassium permanganate solution for 1-5 min, taking out, and drying to obtain packaging paper.

2. The method according to claim 1, wherein the inorganic sol is an aluminum sol or a silica sol.

3. The method according to claim 2, wherein the concentration of the aluminum sol is 0.1 to 5.0 mol/L.

4. The method according to claim 2, wherein the silica sol has a concentration of 0.1 to 2.5 mol/L.

5. The method of claim 3, wherein the step of preparing the composition comprisesThe aluminum sol is prepared by the following method: mixing AlCl₃·6H₂O、H₂Mixing O powder and Al powder according to the molar ratio of 1 (30-100) to (4.5-6), condensing and refluxing for 7-9 h in a water bath at 90 ℃ until the Al powder is completely dissolved, and continuously refluxing for 20min to obtain the aluminum sol.

6. The method according to claim 4, wherein the silica sol is prepared by: adding Na with the concentration of 0.1-2.5mol/L at room temperature under the condition of continuous stirring₂SiO₃H with the volume fraction of 10 percent is dropwise added into the solution₃PO₄And stopping until the pH value is 10, and continuously stirring and reacting for 20min to prepare the silica sol.

7. A packaging paper having a freshness-retaining function, characterized by being produced by the production method according to any one of claims 1 to 6.

Technical Field

The invention relates to the field of fruit logistics, in particular to packaging paper with a fresh-keeping function and a preparation method thereof.

Background

The fruits and vegetables are the second largest agricultural product second to food crops and are important food in life of people, ethylene is ripening hormone of the fruits and vegetables, and the fruits and vegetables can be induced to be ripe when the ethylene concentration is 0.1 mu L/L. The ethylene released by the fruits and vegetables in the storage and transportation processes can be timely and effectively removed, so that the preservation period of the fruits and vegetables can be prolonged. Because potassium permanganate has strong oxidizing property, the ethylene can be removed more completely. However, potassium permanganate is usually loaded on inert materials with large specific surface areas, such as activated carbon and molecular sieves, and most carriers are particles or powder and are easily contaminated on fruits and vegetables, so that the diffusion rate of gas is influenced and the ethylene removal efficiency is reduced when the fruits and vegetables are bagged.

Disclosure of Invention

Based on the defects of the prior art, the invention provides a preparation method of packaging paper with a fresh-keeping function. The packing paper obtained by the method has high ethylene removal efficiency.

A preparation method of packaging paper with a fresh-keeping function comprises the following steps:

(1) dipping the filter paper in the inorganic sol for 2 seconds to 24 hours, taking out, and naturally drying at normal temperature;

(2) repeating the dipping of the step (1) for 2-15 times; and then soaking in a potassium permanganate solution for 1-5 min, taking out, and drying to obtain packaging paper.

Further, the inorganic sol is an aluminum sol or a silica sol.

Further, the concentration of the aluminum sol is 0.1-5.0 mol/L.

Further, the concentration of the silica sol is 0.1-2.5 mol/L.

Further, the aluminum sol is prepared by the following method: mixing AlCl₃·6H₂O、H₂Mixing O powder and Al powder according to the molar ratio of 1 (30-100) to (4.5-6), condensing and refluxing for 7-9 h in a water bath at 90 ℃ until the Al powder is completely dissolved, and continuously refluxing for 20min to obtain the aluminum sol.

Further, the silica sol is prepared by the following method: adding Na with the concentration of 0.1-2.5mol/L at room temperature under the condition of continuous stirring₂SiO₃H with the volume fraction of 10 percent is dropwise added into the solution₃PO₄And stopping until the pH value is 10, and continuously stirring and reacting for 20min to prepare the silica sol.

A packaging paper with a fresh-keeping function is prepared by the preparation method.

Has the advantages that: according to the invention, the filter paper is selected as the base material, and as the main component of the filter paper is the fiber, the surface of the filter paper has more pore structures, the loading capacity of the active component is increased; carrying out surface coating treatment on the filter paper fiber by using the sol prepared by an inorganic sol-gel method, so that the surface of the filter paper fiber is completely and compactly wrapped by the sol, and the filter paper fiber is prevented from being oxidized by potassium permanganate; then the filter paper treated by the sol is loaded with an active component potassium permanganate. The packaging paper prepared by the invention reserves the two-dimensional lamellar structure of the filter paper, completely wraps fruits and vegetables, improves the ethylene removal efficiency, has the advantages of low cost, simple preparation and the like, and has better application prospect in the field of fruit and vegetable fresh-keeping.

Drawings

FIG. 1 is an SEM photograph of the wrapping paper of example 1 of the present invention.

Detailed Description

In order to make the objects and advantages of the invention more comprehensible, specific embodiments of the invention are described in detail below.