A kind of hydrolysis-resistant high-strength corrugated paperboard and preparation method thereof

Abstract

The invention discloses a hydrolysis-resistant high-strength corrugated paperboard and a preparation method thereof. The hydrolysis-resistant high-strength corrugated paperboard comprises a composite of a face paper, a corrugated core paper and a lining paper which are connected in sequence from the outside to the inside, and the face paper and the lining paper are bonded to the corrugated core paper by an adhesive, and the adhesive comprises the following raw materials in parts by weight: 9-27 parts of fluorine-modified acrylic emulsion, 5-15 parts of wood pulp fiber, 4-10 parts of maleic rosin ester, 5-15 parts of acryloyloxyethyl alkyl quaternary ammonium salt, 2-5 parts of carboxymethyl cellulose, and 8-16 parts of filler. The preparation method of the hydrolysis-resistant high-strength corrugated paperboard comprises the following steps: bonding the face paper and the lining paper to the corrugated core paper by an adhesive, and drying at 100-105°C for 3-5 minutes to obtain the hydrolysis-resistant high-strength corrugated paperboard. The corrugated paperboard prepared in the present application has high strength and good water resistance.

Description

Technical Field

[0001] The present application relates to the technical field of corrugated paperboard, and specifically to a hydrolysis-resistant high-strength corrugated paperboard and a preparation method thereof. Background Art

[0002] In the packaging industry, especially in areas involving transportation and storage, corrugated cardboard is widely used because of its lightness and certain strength. However, the starch glue used in the traditional corrugated cardboard lamination process has obvious defects, mainly manifested in water resistance, easy peeling and easy hydrolysis. When exposed to a humid environment, starch glue will quickly lose its adhesion, resulting in a decrease in the stability of the corrugated cardboard structure, thereby affecting the safety and integrity of the packaged items. In addition, the hydrolysis tendency of starch glue is not limited to the influence of the external environment. It will also gradually lose its effectiveness during storage due to its own properties, which limits the life of corrugated cardboard products laminated with starch glue. Summary of the invention

[0003] In order to solve at least one of the above technical problems, a hydrolysis-resistant high-strength corrugated paperboard and a preparation method thereof are developed.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: A hydrolysis-resistant high-strength corrugated paperboard comprises a composite of face paper, corrugated core paper and lining paper which are sequentially connected from outside to inside, wherein the face paper and lining paper are bonded to the corrugated core paper by an adhesive, wherein the adhesive comprises the following raw materials in parts by weight: 9-27 parts of fluorine-modified acrylic ester emulsion, 5-15 parts of wood pulp fiber, 4-10 parts of maleic rosin ester, 5-15 parts of acryloyloxyethyl alkyl quaternary ammonium salt, 2-5 parts of carboxymethyl cellulose and 8-16 parts of filler.

[0005] Through the above technical scheme, the present application selects the combination of fluorine-modified acrylic ester emulsion, wood pulp fiber, maleic rosin ester, acryloyloxyethyl alkyl quaternary ammonium salt, carboxymethyl cellulose and filler, which can effectively improve the hydrolysis resistance and strength of corrugated board. The adhesive of this formula not only improves the performance of corrugated board, but also has good economy and practicality. Fluorine-modified acrylic ester emulsion, as the basis of adhesive, has good hydrolysis resistance and weather resistance, and can improve the water resistance of adhesive. Wood pulp fiber has good dispersibility and bonding properties, can enhance the mechanical properties of adhesive, improve tear resistance and toughness, and enhance the strength of corrugated board. Maleic rosin ester, as an auxiliary component of adhesive, has good water resistance and chemical stability, can improve the bonding strength of adhesive and improve the water resistance of adhesive. Acryloyloxyethyl alkyl quaternary ammonium salt has the effects of bactericide, preservative, and mildewproof agent, prevents corrugated board from getting moldy in a humid environment, and can also be used as a thickener and dispersant with carboxymethyl cellulose to improve the rheological properties and coating properties of adhesive. The addition of fillers helps to form a denser structure, reduce water penetration, and improve the water resistance of the adhesive.

[0006] Optionally, the preparation method of the fluorine-modified acrylate emulsion comprises the following steps: adding acrylate monomer, solvent and initiator into a reaction kettle, maintaining the temperature at 75-85°C, reacting for 5-6 hours, adding perfluorooctyl methacrylate, reacting for 1-2 hours, adding emulsifier and stirring for 30-40 minutes to obtain the fluorine-modified acrylate emulsion.

[0007] Through the above technical scheme, the present application introduces organic fluorine compounds into acrylic ester emulsion, which can effectively improve its water resistance and stain resistance. The water resistance of the adhesive is mainly improved by graft copolymerization of perfluorooctyl methacrylate and acrylic ester monomers.

[0008] Optionally, the weight ratio of the acrylate monomer, perfluorooctyl methacrylate, initiator and emulsifier is (105-120):(8-12):(1-3):(6-10).

[0009] Optionally, the acrylic acid ester monomer comprises methyl methacrylate, 2-hydroxypropyl acrylate and methacrylic acid in a weight ratio of (4.8-5.5):(3.5-4.2):1.

[0010] Optionally, the weight ratio of the fluorine-modified acrylic ester emulsion to the wood pulp fiber is (1.6-2.1):1.

[0011] Optionally, the weight ratio of the fluorine-modified acrylic emulsion to the wood pulp fiber is 1.8:1.

[0012] Through the above technical scheme, the present application defines the usage ratio between the fluorine-modified acrylic emulsion and the wood pulp fiber. The fluorine-modified acrylic emulsion provides good bonding performance and water resistance, while the wood pulp fiber enhances the mechanical properties of the adhesive. By adjusting the usage ratio between the fluorine-modified acrylic emulsion and the wood pulp fiber, the mechanical properties of the adhesive can be enhanced while maintaining good bonding performance, thereby optimizing the overall performance of the corrugated cardboard.

[0013] Optionally, the filler particle size is ≤4 μm.

[0014] Optionally, the filler includes kaolin, wollastonite and nano zinc oxide in a weight ratio of (4-5):(2-3):1.

[0015] Optionally, the method for preparing the adhesive comprises the following steps: mixing and stirring fluorine-modified acrylic emulsion, wood pulp fiber, maleic rosin ester, acryloyloxyethyl alkyl quaternary ammonium salt, carboxymethyl cellulose and filler for 30-40 minutes to obtain the adhesive.

[0016] In a second aspect, the present application provides a method for preparing the above-mentioned hydrolysis-resistant high-strength corrugated cardboard, comprising the following steps: bonding the face paper and the lining paper to the corrugated core paper by an adhesive, and drying at 100-105°C for 3-5 minutes to obtain the hydrolysis-resistant high-strength corrugated cardboard.

[0017] Through the above technical scheme, the corrugated cardboard prepared in the present application has high strength, strong hydrolysis resistance, and a simple preparation method, and is suitable for industrial promotion and production.

[0018] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The present application uses a combination of fluorine-modified acrylic emulsion, wood pulp fiber, maleic rosin ester, acryloyloxyethyl alkyl quaternary ammonium salt, carboxymethyl cellulose and filler, which can effectively improve the hydrolysis resistance and strength of corrugated board. The adhesive of this formula not only improves the performance of corrugated board, but also has good economy and practicality. Fluorine-modified acrylic emulsion, as the basis of adhesive, has good hydrolysis resistance and weather resistance, and can improve the water resistance of adhesive. Wood pulp fiber has good dispersibility and bonding properties, can enhance the mechanical properties of adhesive, improve tear resistance and toughness, and enhance the strength of corrugated board. Maleic rosin ester, as an auxiliary component of adhesive, has good water resistance and chemical stability, can improve the bonding strength of adhesive and improve the water resistance of adhesive. Acryloyloxyethyl alkyl quaternary ammonium salt has the effects of bactericide, preservative and mildewproof agent, prevents corrugated board from getting moldy in a humid environment, and can also be used as a thickener and dispersant with carboxymethyl cellulose to improve the rheological properties and coating properties of adhesive. The addition of fillers helps to form a denser structure, reduce water penetration, and improve the water resistance of the adhesive.

[0019] 2. The corrugated cardboard prepared in this application has high strength, strong hydrolysis resistance, and a simple preparation method, and is suitable for industrial promotion and production. DETAILED DESCRIPTION

[0020] The present application is further described in detail below with reference to the embodiments.

[0021] The present application designs a hydrolysis-resistant high-strength corrugated paperboard, which is composited and made of face paper, corrugated core paper and lining paper which are sequentially connected from the outside to the inside. The face paper and lining paper are bonded to the corrugated core paper by an adhesive, and the adhesive comprises the following raw materials in parts by weight: 9-27 parts of fluorine-modified acrylic ester emulsion, 5-15 parts of wood pulp fiber, 4-10 parts of maleic rosin ester, 5-15 parts of acryloyloxyethyl alkyl quaternary ammonium salt, 2-5 parts of carboxymethyl cellulose, and 8-16 parts of filler.

[0022] The method for preparing the hydrolysis-resistant high-strength corrugated paperboard of the present application comprises the following steps: bonding the face paper and the lining paper to the corrugated core paper by an adhesive, and drying at 100-105° C. for 3-5 minutes to obtain the hydrolysis-resistant high-strength corrugated paperboard.

[0023] The present application aims to solve the problems of adhesives used for corrugated board, such as poor water resistance, easy peeling and easy hydrolysis. When exposed to a humid environment, starch glue will quickly lose its adhesive force, resulting in a decrease in the stability of the corrugated board structure. The present application uses a combination of fluorine-modified acrylic emulsion, wood pulp fiber, maleic rosin ester, acryloyloxyethyl alkyl quaternary ammonium salt, carboxymethyl cellulose and filler, which can effectively improve the hydrolysis resistance and strength of the corrugated board. This adhesive formula not only improves the performance of the corrugated board, but also has good economy and practicality. The preparation method of the corrugated board of the present application is simple and suitable for industrial promotion and production.

[0024] Preparation Example 1-3 Preparation Example 1 This preparation example provides a method for preparing a fluorine-modified acrylate emulsion, which is as follows: adding acrylate monomer, solvent and initiator into a reaction kettle, maintaining the temperature at 75°C, reacting for 6 hours, adding perfluorooctyl methacrylate, reacting for 2 hours, adding emulsifier and stirring for 30 minutes to obtain a fluorine-modified acrylate emulsion.

[0025] Among them, the weight ratio of acrylate monomer, perfluorooctyl methacrylate, initiator and emulsifier is 105:8:1:6.

[0026] The acrylate monomers include methyl methacrylate, 2-hydroxypropyl acrylate and methacrylic acid in a weight ratio of 4.8:3.5:1.

[0027] Preparation Example 2 This preparation example provides a method for preparing a fluorine-modified acrylate emulsion, which is as follows: adding acrylate monomer, solvent and initiator into a reaction kettle, maintaining the temperature at 80°C, reacting for 5.5 hours, adding perfluorooctyl methacrylate, reacting for 1.5 hours, adding emulsifier and stirring for 35 minutes to obtain a fluorine-modified acrylate emulsion.

[0028] Among them, the weight ratio of acrylate monomer, perfluorooctyl methacrylate, initiator and emulsifier is 112:9:2:8.

[0029] The acrylate monomers include methyl methacrylate, 2-hydroxypropyl acrylate and methacrylic acid in a weight ratio of 5.1:3.9:1.

[0030] Preparation Example 3 This preparation example provides a method for preparing a fluorine-modified acrylate emulsion, which is as follows: adding acrylate monomer, solvent and initiator into a reaction kettle, maintaining the temperature at 85°C, reacting for 5 hours, adding perfluorooctyl methacrylate, reacting for 1 hour, adding emulsifier and stirring for 40 minutes to obtain a fluorine-modified acrylate emulsion.

[0031] Among them, the weight ratio of acrylate monomer, perfluorooctyl methacrylate, initiator and emulsifier is 120:12:3:10.

[0032] The acrylate monomers include methyl methacrylate, 2-hydroxypropyl acrylate and methacrylic acid in a weight ratio of 5.5:4.2:1.

[0033] Example 1 The present embodiment provides a hydrolysis-resistant high-strength corrugated paperboard, which is composited and made of face paper, corrugated core paper and lining paper which are sequentially connected from outside to inside, wherein the face paper and lining paper are bonded to the corrugated core paper by an adhesive, wherein the adhesive comprises the following raw materials in parts by weight: 18 parts of fluorine-modified acrylic ester emulsion, 10 parts of wood pulp fiber, 4 parts of maleic rosin ester, 5 parts of acryloyloxyethyl alkyl quaternary ammonium salt, 2 parts of carboxymethyl cellulose, and 8 parts of filler.

[0034] In this embodiment, the fluorine-modified acrylic emulsion is prepared according to Preparation Example 1, the filler is kaolin, wollastonite and nano zinc oxide in a weight ratio of 4:2:1, and the filler particle size is ≤4 μm.

[0035] The method for preparing the hydrolysis-resistant high-strength corrugated paperboard in this embodiment comprises the following steps: bonding the face paper and the lining paper to the corrugated core paper by an adhesive, and drying at 102° C. for 4 minutes to obtain the hydrolysis-resistant high-strength corrugated paperboard.

[0036] Embodiment 2-4 Example 2 The difference between this embodiment and embodiment 1 is that when preparing the hydrolysis-resistant high-strength corrugated paperboard, the total weight of the fluorine-modified acrylic ester emulsion and the wood pulp fiber is 28 parts, and the weight ratio of the fluorine-modified acrylic ester emulsion to the wood pulp fiber is 1.6:1.

[0037] Example 3 The difference between this embodiment and embodiment 1 is that when preparing the hydrolysis-resistant high-strength corrugated paperboard, the total weight of the fluorine-modified acrylic ester emulsion and the wood pulp fiber is 28 parts, and the weight ratio of the fluorine-modified acrylic ester emulsion to the wood pulp fiber is 2:1.

[0038] Example 4 The difference between this embodiment and embodiment 1 is that when preparing the hydrolysis-resistant high-strength corrugated paperboard, the total weight of the fluorine-modified acrylic ester emulsion and the wood pulp fiber is 28 parts, and the weight ratio of the fluorine-modified acrylic ester emulsion to the wood pulp fiber is 2.1:1.

[0039] Comparative Example 1 The difference between this comparative example and Example 1 is that no wood pulp fiber is added when preparing the hydrolysis-resistant high-strength corrugated paperboard.

[0040] Comparative Example 2 The difference between this comparative example and Example 1 is that, when preparing the hydrolysis-resistant high-strength corrugated paperboard, an equal amount of unmodified acrylic emulsion is used to replace the fluorine-modified acrylic emulsion.

[0041] Experimental testing The hydrolysis-resistant high-strength corrugated paperboards prepared in the examples and comparative examples were tested for bursting strength, adhesive strength, and water resistance. The water resistance is to place the paperboard in 25°C water at room temperature and record the time when degumming and paper separation occur, which reflects the water resistance of the inside of the paperboard and the adhesive.

[0042] Test results The experimental test results of Examples 1-4 and Comparative Examples 1-3 are shown in Table 1.

[0043] Table 1 - Experimental test results of Examples 1-4 and Comparative Examples 1-3 Example Bursting strength(Mpa) Bond strength (N / m) Water resistance (h) Example 1 2.3 15.4 ＞6h Example 2 1.8 14.4 ＞4h Example 3 2.1 14.8 ＞6h Example 4 2.0 14.7 ＞6h Comparative Example 1 1.7 12.9 ＜4h Comparative Example 2 1.4 12.4 ＜6h Result analysis: The difference between Examples 2-4 and Example 1 is that, when preparing hydrolysis-resistant high-strength corrugated paperboard, the total weight of fluorine-modified acrylic emulsion and wood pulp fiber is 28 parts, and the weight ratio of fluorine-modified acrylic emulsion and wood pulp fiber is different. Combined with the experimental test results in Table 1, it can be seen that when the weight ratio of fluorine-modified acrylic emulsion and wood pulp fiber is 1.8:1, the comprehensive performance of the obtained hydrolysis-resistant high-strength corrugated paperboard is better. The difference between Comparative Example 1 and Example 1 is that when preparing hydrolysis-resistant high-strength corrugated paperboard, wood pulp fiber is not added. The difference between Comparative Example 2 and Example 1 is that when preparing hydrolysis-resistant high-strength corrugated paperboard, an equal amount of unmodified acrylic emulsion is used to replace the fluorine-modified acrylic emulsion. Combined with the experimental test results in Table 1, it can be seen that when preparing hydrolysis-resistant high-strength corrugated paperboard, the compound use of fluorine-modified acrylic emulsion and wood pulp fiber can better improve the comprehensive performance of the obtained hydrolysis-resistant high-strength corrugated paperboard.

[0044] Embodiment 5-6 The difference between Example 5-6 and Example 1 is that the weight fractions of some components are changed when preparing the hydrolysis-resistant high-strength corrugated paperboard. See Table 2 for the differences.

[0045] Table 2 - Differences between Examples 5-6 and Example 1 Ingredients (parts by weight) Example 1 Example 5 Example 6 Fluorine modified acrylic emulsion 18 18 18 Wood pulp fiber 10 10 10 Maleic rosin ester 4 7 10 Acryloyloxyethyl alkyl quaternary ammonium salt 5 12 15 Carboxymethyl cellulose 2 3 5 filler 8 13 16 The experimental test results of Examples 5-6 are shown in Table 3.

[0046] Table 3 - Experimental test results of Examples 5-6 Example Bursting strength(Mpa) Bond strength (N / m) Water resistance (h) Example 1 2.3 15.4 ＞6h Example 5 2.6 15.9 ＞8h Example 6 2.4 15.6 ＞6h Result analysis: The difference between Example 5-6 and Example 1 is that when preparing the hydrolysis-resistant high-strength corrugated paperboard, the weight proportions of some components are different. Combined with the experimental test results in Table 1, it can be seen that when preparing the hydrolysis-resistant high-strength corrugated paperboard, the hydrolysis-resistant high-strength corrugated paperboard prepared in Example 5 has better comprehensive performance.

[0047] Example 7 The difference between Example 7 and Example 5 is that the filler is kaolin, wollastonite and nano zinc oxide in a weight ratio of 4.5:2.5:1.

[0048] Example 8 The difference between Example 8 and Example 5 is that the filler is kaolin, wollastonite and nano zinc oxide in a weight ratio of 5:3:1.

[0049] The experimental test results of Examples 7-8 are shown in Table 4.

[0050] Table 4 - Experimental test results of Examples 7-8 Example Bursting strength(Mpa) Bond strength (N / m) Water resistance (h) Example 5 2.6 15.9 ＞8h Example 7 2.9 16.3 ＞8h Example 8 2.7 16.1 ＞8h Result analysis: The difference between Example 7-8 and Example 5 is that when preparing hydrolysis-resistant high-strength corrugated paperboard, the weight ratios of kaolin, wollastonite and nano-zinc oxide in the filler are different. When the weight ratio of kaolin, wollastonite and nano-zinc oxide is 4.5:2.5:1, the comprehensive performance of the hydrolysis-resistant high-strength corrugated paperboard is better.

[0051] Examples 9-10 Example 9 The difference between this embodiment and embodiment 7 is that, when preparing hydrolysis-resistant high-strength corrugated paperboard, the fluorine-modified acrylate emulsion in this embodiment is prepared by Preparation Example 2.

[0052] Example 10 The difference between this embodiment and embodiment 7 is that, when preparing hydrolysis-resistant high-strength corrugated paperboard, the fluorine-modified acrylic ester emulsion in this embodiment is prepared by Preparation Example 3.

[0053] The experimental test results of Examples 9-10 are shown in Table 5.

[0054] Table 5 - Experimental test results of Examples 9-10 Example Bursting strength(Mpa) Bond strength (N / m) Water resistance (h) Example 7 2.9 16.3 ＞8h Example 9 2.9 16.6 ＞10h Example 10 2.8 16.3 ＞8h Result analysis: The difference between Example 9-10 and Example 7 is that when preparing hydrolysis-resistant high-strength corrugated paperboard, the wood pulp fiber prepared by Preparation Example 2 can better improve the comprehensive performance of the hydrolysis-resistant high-strength corrugated paperboard.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydrolysis-resistant high-strength corrugated paperboard, comprising a surface paper, a corrugated core paper and a lining paper connected in sequence from outside to inside, characterized in that: The face paper and the lining paper are bonded to the corrugated core paper by an adhesive, wherein the adhesive comprises the following raw materials in parts by weight: 9-27 parts of fluorine-modified acrylic emulsion, 5-15 parts of wood pulp fiber, 4-10 parts of maleic rosin ester, 5-15 parts of acryloyloxyethyl alkyl quaternary ammonium salt, 2-5 parts of carboxymethyl cellulose, and 8-16 parts of filler.

2. The hydrolysis-resistant high-strength corrugated paperboard according to claim 1, characterized in that: The preparation method of the fluorine-modified acrylate emulsion comprises the following steps: adding acrylate monomer, solvent and initiator into a reaction kettle, maintaining the temperature at 75-85° C., reacting for 5-6 hours, adding perfluorooctyl methacrylate, reacting for 1-2 hours, adding emulsifier and stirring for 30-40 minutes to obtain the fluorine-modified acrylate emulsion.

3. The hydrolysis-resistant high-strength corrugated paperboard according to claim 2, characterized in that: The weight ratio of the acrylic acid ester monomer, perfluorooctyl methacrylate, initiator and emulsifier is (105-120): (8-12): (1-3): (6-10).

4. The hydrolysis-resistant high-strength corrugated paperboard according to claim 2, characterized in that: The acrylic acid ester monomers include methyl methacrylate, 2-hydroxypropyl acrylate and methacrylic acid in a weight ratio of (4.8-5.5):(3.5-4.2):

1.

5. The hydrolysis-resistant high-strength corrugated paperboard according to claim 1, characterized in that: The weight ratio of the fluorine-modified acrylic ester emulsion to the wood pulp fiber is (1.6-2.1):

1.

6. The hydrolysis-resistant high-strength corrugated paperboard according to claim 5, characterized in that: The weight ratio of the fluorine-modified acrylic ester emulsion to the wood pulp fiber is 1.8:

1.

7. The hydrolysis-resistant high-strength corrugated paperboard according to claim 1, characterized in that: The filler particle size is ≤4 μm.

8. The hydrolysis-resistant high-strength corrugated paperboard according to claim 1, characterized in that: The filler comprises kaolin, wollastonite and nano zinc oxide in a weight ratio of (4-5):(2-3):

1.

9. The hydrolysis-resistant high-strength corrugated paperboard according to claim 1, characterized in that: The preparation method of the adhesive comprises the following steps: mixing and stirring fluorine-modified acrylic ester emulsion, wood pulp fiber, maleic rosin ester, acryloyloxyethyl alkyl quaternary ammonium salt, carboxymethyl cellulose and filler for 30-40 minutes to prepare the adhesive.

10. A method for preparing the hydrolysis-resistant high-strength corrugated paperboard according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: bonding the face paper and the lining paper to the corrugated core paper by means of an adhesive, and drying the paper at 100-105° C. for 3-5 minutes to obtain the hydrolysis-resistant high-strength corrugated paperboard.