Surface super-hydrophobic method based on paper containing biological enzyme modified polyphenol substance

Abstract

The invention relates to a surface super-hydrophobic method based on paper containing a biological enzyme modified polyphenol substance, which comprises the following steps: S1, dissolving polyphenol, biological enzyme and a metal compound in water, preparing a modified polyphenol-metal ion solution with the solid content of 1-30%, and uniformly stirring to form a modified polyphenol-metal ion solution; and S2, adding the modified polyphenol-metal ion solution into a steamed paper sizing glue solution to be subjected to heat preservation or diluted to obtain a mixed glue solution, and sizing the paper to obtain the paper with the super-hydrophobic surface. According to the invention, the bonding strength of paper fibers is obviously improved, the waterproof performance of the paper is improved, a layer of protective film is formed on the surface of the paper, water permeation is prevented, the surface tension of the paper is improved, and the surface of the paper is more hydrophobic.

Description

Technical Field

[0001] The invention belongs to the technical field of food packaging paper, and in particular relates to a method for making the surface of paper super-hydrophobic based on polyphenol substances modified by biological enzymes. Background Art

[0002] The moisture resistance of packaging paper, such as corrugated paper, has always been a difficult problem in the industry. There are many ways to improve the strength of corrugated paper, such as increasing water resistance, adjusting wet strength, etc. However, the research on the use of bio-enzyme-modified polyphenols to chelate metal ions to generate super-hydrophobic materials and surface sizing for moisture resistance is still blank. The main difficulty is that after the super-hydrophobic modification, the strength of the paper will be significantly reduced and lose its significance as packaging paper. Summary of the invention

[0003] (I) Purpose of the invention

[0004] In order to overcome the above shortcomings, the purpose of the present invention is to provide a method for making the surface of paper super-hydrophobic based on polyphenol substances modified by biological enzymes to solve the above technical problems.

[0005] (II) Technical solution

[0006] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0007] A method for making the surface of paper super-hydrophobic based on polyphenol substances modified by biological enzymes comprises the following steps:

[0008] S1: dissolving polyphenol, biological enzyme and metal compound in water in a mass ratio of (0.001-1):1:(1-10), the preparation temperature is 30-75°C, the mixing time is 30-120min, the solid content is 1-30%, and the modified polyphenol-metal ion solution is formed after being stirred evenly;

[0009] S2: adding the modified polyphenol-metal ion solution to the paper sizing solution that has been cooked and is to be kept warm or diluted to obtain a mixed solution, and then sizing the paper to obtain paper with a super-hydrophobic surface.

[0010] Preferably, the polyphenols in S1 are one or more of dopamine, octadecylamine, gallic acid, pyrogallic acid, lauryl gallate, p-hydroxycinnamic acid, phenyl-containing amino acids, catechins, flavonoids, anthocyanins, phenolic acids, and plant polyphenols.

[0011] Preferably, the biological enzyme in S1 is one or more of cellulase, pectinase, hemicellulase, ligninase, laccase, protease, α-amylase and xylanase.

[0012] Preferably, the metal compound in S1 is: FeSO 4 、FeCl2 AgNO 3 ,CuSO 4 、CeCl 3 At least one of .

[0013] Preferably, the ratio of the paper sizing solution in S2 is 35-65 kg / ton of paper of starch, 1-5 kg / ton of paper of AKD, 0-5 kg / ton of paper of styrene acrylic surface sizing agent, and 5-15 kg / ton of paper of sizing enhancer.

[0014] Preferably, the modified polyphenol-metal ion solution is added in an absolute dry amount of 3-10 kg / ton of paper in the mixed glue solution, and after addition, the solution is kept warm at 65-75° C. for 30 minutes.

[0015] Beneficial effects:

[0016] The invention significantly improves the bonding strength of paper fibers and improves its waterproof performance, forms a protective film on the surface of the paper to prevent water penetration, and improves the surface tension of the paper, making the paper surface more hydrophobic.

[0017] Corrugated paper with super-hydrophobic surface modification has strong resistance to water vapor condensation, which is very important for food packaging boxes leaving cold storage and cold chain boxes. Most packaging boxes collapse because they enter a high-temperature environment from a low-temperature environment, and a large amount of water droplets condense on the surface of the packaging boxes. However, for packaging boxes that have been super-hydrophobic modified, the condensed water droplets will not gather on the surface of the paper and soak the carton, so that it will not collapse due to a decrease in strength due to environmental changes.

[0018] Corrugated paper with super-hydrophobic surface modification has stronger water resistance and hot water resistance, making it more moisture-proof. The polyphenol-metal ion super-hydrophobic material modified by bio-enzyme has better bonding strength with paper fibers, changing the problem of paper strength being affected by hydrophobic design. The material has good antibacterial properties, making food packaging boxes more environmentally friendly. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0020] The present invention provides a method for making the surface of paper super-hydrophobic based on polyphenol substances modified by biological enzymes, comprising the following steps:

[0021] S1: dissolving polyphenol, biological enzyme and metal compound in water in a mass ratio of (0.001-1):1:(1-10), the preparation temperature is 30-75°C, the mixing time is 30-120min, the solid content is 1-30%, and the modified polyphenol-metal ion solution is formed after being stirred evenly;

[0022] The polyphenols are one or more of dopamine, octadecylamine, gallic acid, pyrogallic acid, lauryl gallate, p-hydroxycinnamic acid, phenyl-containing amino acids, catechins, flavonoids, anthocyanins, phenolic acids, and plant polyphenols.

[0023] The biological enzyme is one or more of cellulase, pectinase, hemicellulase, ligninase, laccase, protease, α-amylase and xylanase.

[0024] Metal compounds: FeSO 4 、FeCl 2 AgNO 3 、CuSO 4 、CeCl 3 At least one of .

[0025] S2: adding the modified polyphenol-metal ion solution to the paper sizing solution that has been cooked and is to be kept warm or diluted to obtain a mixed solution, and then sizing the paper to obtain paper with a super-hydrophobic surface.

[0026] The ratio of the paper sizing solution in S2 is 35-65 kg / ton of paper for starch, 1-5 kg / ton of paper for AKD, 0-5 kg / ton of paper for styrene acrylic surface sizing agent, and 5-15 kg / ton of paper for sizing enhancer.

[0027] The modified polyphenol-metal ion solution is added in an absolute dry amount of 3-10 kg / ton of paper in the mixed glue solution, and is kept warm at 65-75° C. for 30 minutes after addition.

[0028] Example 1

[0029] S1 combines dopamine, cellulase, FeSO 4 Dissolve in water at a mass ratio of 0.001:1:1, the preparation temperature is 30°C, the mixing time is 30 minutes, the solid content is 1%, and the modified polyphenol-metal ion solution is formed after stirring evenly;

[0030] S2: adding the modified polyphenol-metal ion solution to the paper sizing solution that has been cooked and is to be kept warm or diluted to obtain a mixed solution, and then sizing the paper to obtain paper with a super-hydrophobic surface.

[0031] The modified polyphenol-metal ion solution is added in an absolute dry amount of 3 kg / ton of paper in the mixed glue solution, and is kept warm at 65° C. for 30 minutes after addition.

[0032] Example 2

[0033] S1 combines dopamine, cellulase, CuSO 4 Dissolve in water at a mass ratio of 0.03:1:2, at a preparation temperature of 40°C, a mixing time of 40 minutes, a preparation solid content of 5%, and stir evenly to form a modified polyphenol-metal ion solution;

[0034] S2: adding the modified polyphenol-metal ion solution to the paper sizing solution that has been cooked and is to be kept warm or diluted to obtain a mixed solution, and then sizing the paper to obtain paper with a super-hydrophobic surface.

[0035] The modified polyphenol-metal ion solution is added in an absolute dry amount of 4 kg / ton of paper in the mixed glue solution, and is kept warm at 68° C. for 30 minutes after addition.

[0036] Example 3

[0037] S1 will catechins, laccase, FeSO 4 Dissolve in water at a mass ratio of 0.5:1:3, at a preparation temperature of 50°C, a mixing time of 40 minutes, a preparation solid content of 10%, and stir evenly to form a modified polyphenol-metal ion solution;

[0038] S2: adding the modified polyphenol-metal ion solution to the paper sizing solution that has been cooked and is to be kept warm or diluted to obtain a mixed solution, and then sizing the paper to obtain paper with a super-hydrophobic surface.

[0039] The modified polyphenol-metal ion solution is added in an absolute dry amount of 5 kg / ton of paper in the mixed glue solution, and is kept warm at 68° C. for 30 minutes after addition.

[0040] Example 4

[0041] S1 catechins, laccase, CuSO 4 Dissolve in water at a mass ratio of 0.5:1:5, at a preparation temperature of 50°C, a mixing time of 40 minutes, a preparation solid content of 15%, and stir evenly to form a modified polyphenol-metal ion solution;

[0042] S2: adding the modified polyphenol-metal ion solution to the paper sizing solution that has been cooked and is to be kept warm or diluted to obtain a mixed solution, and then sizing the paper to obtain paper with a super-hydrophobic surface.

[0043] The modified polyphenol-metal ion solution is added in an absolute dry amount of 6 kg / ton of paper in the mixed glue solution, and is kept warm at 68° C. for 30 minutes after addition.

[0044] Example 5

[0045] S1: dissolving polyphenols, biological enzymes and metal compounds in water at a mass ratio of 0.5:1:5, with a preparation temperature of 50°C, a mixing time of 40 minutes, a preparation solid content of 15%, and stirring evenly to form a modified polyphenol-metal ion solution;

[0046] The polyphenols include dopamine and catechins, the biological enzymes include cellulase and laccase, and the metal compounds include CuSO 4 and FeSO 4。

[0047] S2: adding the modified polyphenol-metal ion solution to the paper sizing solution that has been cooked and is to be kept warm or diluted to obtain a mixed solution, and then sizing the paper to obtain paper with a super-hydrophobic surface.

[0048] The modified polyphenol-metal ion solution is added in an absolute dry amount of 6 kg / ton of paper in the mixed glue solution, and is kept warm at 68° C. for 30 minutes after addition.

[0049] The following are the experimental data of Examples 1-5 and the control group:

[0050]

[0051]

[0052] By comparing the experimental data of the five embodiments and the control group, it can be seen that the bonding strength of the embodiment group is generally higher than that of the control group. The average bonding strength of the embodiment group is 8.93 N / m, while the bonding strength of the control group is 7.5 N / m. This shows that adding the modified polyphenol-metal ion solution can significantly improve the bonding strength of paper fibers.

[0053] The water absorption of the example group is generally lower than that of the control group, and the average water absorption of the example group is 0.40 g / m 2 , while the water absorption of the control group was 0.8g / m 2 This indicates that the paper with the modified polyphenol-metal ion solution added has better waterproof performance.

[0054] The surface tension of the example group is generally higher than that of the control group, with an average surface tension of 49.5 mN / m in the example group and 35 mN / m in the control group, indicating that the paper to which the modified polyphenol-metal ion solution is added has higher hydrophobicity.

[0055] In summary, the present invention significantly improves the bonding strength of paper fibers and improves its waterproof performance, forms a protective film on the surface of paper to prevent water penetration, and increases the surface tension of the paper, making the paper surface more hydrophobic.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for making the surface of paper super-hydrophobic based on polyphenols modified by biological enzymes, characterized in that: The following steps are involved: S1: dissolving polyphenol, biological enzyme and metal compound in water in a mass ratio of (0.001-1):1:(1-10), the preparation temperature is 30-75°C, the mixing time is 30-120min, the solid content is 1-30%, and the modified polyphenol-metal ion solution is formed after being stirred evenly; S2: adding the modified polyphenol-metal ion solution to the paper sizing solution that has been cooked and is to be kept warm or diluted to obtain a mixed solution, and then sizing the paper to obtain paper with a super-hydrophobic surface.

2. A method for making the surface of paper super-hydrophobic based on polyphenols modified by biological enzymes according to claim 1, characterized in that: The polyphenols in S1 are one or more of dopamine, octadecylamine, gallic acid, pyrogallic acid, lauryl gallate, p-hydroxycinnamic acid, phenyl-containing amino acids, catechins, flavonoids, anthocyanins, phenolic acids, and plant polyphenols.

3. A method for making the surface of paper super-hydrophobic based on polyphenols modified by biological enzymes according to claim 1, characterized in that: The biological enzyme in S1 is one or more of cellulase, pectinase, hemicellulase, ligninase, laccase, protease, α-amylase and xylanase.

4. A method for making the surface of paper super-hydrophobic based on polyphenols modified by biological enzymes according to claim 1, characterized in that: The metal compound in S1 is at least one of FeSO4, FeCl2, AgNO3, CuSO4, and CeCl3.

5. The method for making the surface of paper super-hydrophobic based on polyphenols modified by bio-enzymes according to claim 1, characterized in that: The ratio of the paper sizing solution in S2 is 35-65 kg / ton of paper for starch, 1-5 kg / ton of paper for AKD, 0-5 kg / ton of paper for styrene acrylic surface sizing agent, and 5-15 kg / ton of paper for sizing enhancer.

6. A method for making the surface of paper super-hydrophobic based on polyphenols modified by biological enzymes according to claim 1, characterized in that: The modified polyphenol-metal ion solution is added in an absolute dry amount of 3-10 kg / ton of paper in the mixed glue solution, and is kept warm at 65-75° C. for 30 minutes after addition.

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