Preparation method of corrugated paperboard plasticizing nano-sulfur dioxide sol

Abstract

This invention discloses a method for preparing a plasticizing nano-SO2 sol for corrugated cardboard, comprising: adding 10-20g of sodium carboxymethyl cellulose to 1000g of deionized water at 50-70℃ until dissolved; adding 3-5g of a mixture of gelatin and pectin by weight and dissolving; then adding 15-30g of soluble starch and dissolving to obtain a transparent colloidal solution; cooling to room temperature; adding 5-8g of decanoic acid triglyceride and stirring for 10-15 min; then adding 4-8g of ethylene glycol and stirring until dissolved to obtain a sol system; continuing to add 10-20g of fumed nano-SiO2 and 5 mL of anhydrous ethanol to uniformly disperse them in the sol system; then adding 1-3g of sodium dodecylbenzenesulfonate; stirring at room temperature for 10 min; and allowing to stand for 30 min to obtain the final product. This invention not only improves the waterproof performance of corrugated cardboard boxes but also enhances their compressive strength and impermeability.

Description

Technical Field

[0001] This invention belongs to the field of chemical technology, specifically relating to a method for preparing a plasticizing nano-SO2 sol for corrugated cardboard. Background Technology

[0002] Corrugated cardboard boxes are packaging materials formed by cutting, binding, or gluing corrugated cardboard according to a certain spatial structure. They have advantages such as ease of production and processing, low cost, and recyclability, and are widely used in various industries. The physicochemical properties of corrugated cardboard directly affect the strength, impact resistance, and water resistance of corrugated cardboard boxes. During use, corrugated cardboard typically absorbs moisture from the environment, weakening the box's strength and limiting its application in packaging fruits, hydrophobic vegetables, and aquatic products. Current improvements to the water resistance of corrugated cardboard boxes are generally based on the raw paper and pulp preparation process, such as adding hydrophobic substances to reduce the cardboard's absorption characteristics or strengthening the raw cardboard structure. However, these methods still cannot effectively solve the problem of moisture penetration or weaken the effect of environmental humidity on the water absorption capacity of corrugated cardboard. Therefore, existing technology uses a thin hydrophobic film sprayed onto the cardboard surface to improve the water resistance of corrugated cardboard boxes. The main methods of waterproofing include coating the surface of corrugated cardboard with PVC to form a waterproof membrane and prevent water penetration; applying paraffin wax and varnish to create a hydrophobic layer on the surface, also preventing water penetration; and using electrospinning technology to prepare a fiber membrane from polyester and polyamide to enhance the waterproof performance of corrugated cardboard. However, these methods have the following drawbacks: traditional waterproof coatings are easily worn or scratched during long-term use, leading to damage to the hydrophobic layer and thus reducing the waterproof performance and mechanical strength of the corrugated cardboard; hydrophobic treatments may also reduce the mechanical strength of the corrugated cardboard, especially when exposed to humid environments for extended periods. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a method for preparing corrugated cardboard plasticized nano SO2 sol that can not only improve the waterproof performance of corrugated boxes, but also enhance their compressive strength and impermeability.

[0004] The present invention discloses a method for preparing a corrugated cardboard plasticizing nano-SO2 sol, comprising the following steps: (1) Weigh 1000 g of deionized water and heat it to 50~70℃. Add 10~20 g of sodium carboxymethyl cellulose and stir at a constant temperature until the sodium carboxymethyl cellulose is completely dissolved. (2) Mix gelatin and pectin in equal mass, weigh 3-5g of the mixture and add it to the solution obtained in step (1). Stir until completely dissolved, then add 15-30g of soluble starch and continue stirring until dissolved to obtain a transparent colloidal solution. (3) Cool the colloidal solution to room temperature, add 5-8 g of decanoic acid triglyceride, stir for 10-15 min, then add 4-8 g of ethylene glycol and stir until dissolved to obtain a sol system; (4) Weigh 10-20g of gaseous nano-SiO2 and 5 mL of anhydrous ethanol and pour them into the sol system obtained in step (3). Stir for 20-30 min to make it evenly dispersed in the sol system to obtain the nano-SiO2 sol system. (5) Add 1~3 g of sodium dodecylbenzenesulfonate to the nano SiO2 sol system, stir for 10 min at room temperature, and let stand for 30 min to obtain the final product.

[0005] The above-mentioned method for preparing corrugated cardboard plasticized nano SO2 sol, wherein the ethylene glycol mentioned in step (3) is 2000 or 4000.

[0006] Compared with the prior art, the present invention has significant advantages. As can be seen from the above technical solution, the corrugated cardboard plasticizing nano-SO2 sol prepared by the present invention, combined with the characteristics of the corrugated cardboard box production process, involves spraying the plasticizing nano-SiO2 sol of the present invention onto the surface side after preheating the corrugated base paper, face paper, and liner paper, so that a hydrophobic film is formed on the paper surface side, and then processed into corrugated cardboard and cartons. The test results show that the anti-water resistance of the corrugated cardboard is enhanced while the compressive strength of the cardboard is also improved. The whole process is highly operable and environmentally friendly, and has the advantages of low cost, simple process, and high economic benefits. Detailed Implementation

[0007] The following detailed description, in conjunction with preferred embodiments, illustrates the specific implementation methods and beneficial effects of a method for preparing corrugated cardboard plasticized nano-SO2 sol according to the present invention. Example 1

[0008] The present invention discloses a method for preparing a corrugated cardboard plasticizing nano-SO2 sol, comprising the following steps: (1) Weigh 1000 g of deionized water and place it in a 3000 mL beaker. Heat the water to 50 °C and add 10 g of sodium carboxymethyl cellulose. Stir the mixture at a constant temperature until the sodium carboxymethyl cellulose is completely dissolved. (2) Mix gelatin and pectin by equal mass, weigh 5 g of the mixture and add it to the solution obtained in step (1). Stir mechanically until completely dissolved, then add 15 g of soluble starch and continue stirring until dissolved to obtain a transparent colloidal solution. (3) Cool the colloidal solution system formed in (2) to room temperature, add 5 g of decanoic acid triglyceride, stir mechanically for 10 min, then add 8 g of ethylene glycol (2000 or 4000), and stir mechanically until dissolved to obtain a sol system; (4) Weigh 10g of gaseous nano-SiO2 and 50 mL of anhydrous ethanol and pour them into the sol system obtained in step (3). Stir mechanically for 30 min to make it evenly dispersed in the sol system to obtain the nano-SiO2 sol system. (5) Add 3 g of sodium dodecylbenzenesulfonate to the nano SiO2 sol system, stir mechanically for 10 min at room temperature, and let stand for 30 min to obtain the final product.

[0009] Testing method: After preheating the corrugated core paper, face paper, and liner paper to 60℃, apply a 10g / m² test sample to the paper surface. 2 The corrugated cardboard plasticized with nano-SO2 sol obtained by physicochemical spraying was dried with hot air at 70℃ and then processed into waterproof corrugated cardboard according to a predetermined production process. Testing showed that the corrugated cardboard treated with the plasticized nano-SiO2 colloid exhibited a bonding strength, water immersion edge crush strength, water immersion bursting index, and water penetration time of 539 N / m. 2 4675N / m 2 The compressive strength of corrugated cardboard boxes was significantly improved, reaching 168.4 kPa and lasting 10 minutes and 23 seconds. Example 2

[0010] The present invention discloses a method for preparing a corrugated cardboard plasticizing nano-SO2 sol, comprising the following steps: (1) Weigh 1000 g of deionized water and place it in a 3000 mL beaker. Heat the water to 70 °C and add 20 g of sodium carboxymethyl cellulose. Stir the mixture at a constant temperature until the sodium carboxymethyl cellulose is completely dissolved. (2) Mix gelatin and pectin in equal mass, and weigh 3 g of the mixture and add it to the solution obtained in step (1). Stir mechanically until completely dissolved, then add 30 g of soluble starch and continue stirring until dissolved to obtain a transparent colloidal solution. (3) Cool the colloidal solution system formed in (2) to room temperature, add 8 g of decanoic acid triglyceride, stir mechanically for 15 min, then add 4 g of ethylene glycol (2000 or 4000), and stir mechanically until it dissolves to obtain a sol system; (4) Weigh 20g of gaseous nano-SiO2 and 50 mL of anhydrous ethanol and pour them into the sol system obtained in step (3). Stir mechanically for 20 min to make it evenly dispersed in the sol system to obtain the nano-SiO2 sol system. (5) Add 1 g of sodium dodecylbenzenesulfonate to the nano SiO2 sol system, stir mechanically for 10 min at room temperature, and let stand for 30 min to obtain the final product.

[0011] Testing method: After preheating the corrugated core paper, face paper, and liner paper to 60℃, apply a 10g / m² test sample to the paper surface. 2The corrugated cardboard plasticized with nano-SO2 sol obtained by physicochemical spraying was dried with hot air at 70℃ and then processed into waterproof corrugated cardboard according to a predetermined production process. Testing showed that the corrugated cardboard treated with the plasticized nano-SiO2 colloid exhibited a bonding strength, water-immersion edge crush strength, water-immersion bursting index, and water penetration time of 542 N / m. 2 4706 N / m 2 The compressive strength of corrugated cardboard boxes was significantly improved, reaching 173.0 kPa and 9 minutes and 58 seconds. Example 3

[0012] The present invention discloses a method for preparing a corrugated cardboard plasticizing nano-SO2 sol, comprising the following steps: (1) Weigh 1000 g of deionized water and place it in a 3000 mL beaker. Heat the water to 60 °C and add 15 g of sodium carboxymethyl cellulose. Stir the mixture at a constant temperature until the sodium carboxymethyl cellulose is completely dissolved. (2) Mix gelatin and pectin in equal mass, and weigh 4 g of the mixture and add it to the solution obtained in step (1). Stir until completely dissolved, then add 25 g of soluble starch and continue stirring until dissolved to obtain a transparent colloidal solution. (3) Cool the colloidal solution system formed in (2) to room temperature, add 6 g of decanoic acid triglyceride, stir mechanically for 12 min, then add 6 g of ethylene glycol (2000 or 4000), and stir until dissolved to obtain a sol system; (4) Weigh 15 g of gaseous nano-SiO2 and 50 mL of anhydrous ethanol and pour them into the sol system obtained in step (3). Stir mechanically for 25 min to make it evenly dispersed in the sol system to obtain the nano-SiO2 sol system. (5) Add 2 g of sodium dodecylbenzenesulfonate to the nano SiO2 sol system, stir mechanically for 10 min at room temperature, and let stand for 30 min to obtain the final product.

[0013] Testing method: After preheating the corrugated core paper, face paper, and liner paper to 60℃, apply a 10g / m² test sample to the paper surface. 2 The corrugated cardboard plasticized with nano-SO2 sol obtained by physicochemical spraying was dried with hot air at 70℃ and then processed into waterproof corrugated cardboard according to a predetermined production process. Testing showed that the corrugated cardboard treated with the plasticized nano-SiO2 colloid exhibited a bonding strength, water immersion edge crush strength, water immersion bursting index, and water penetration time of 559 N / m. 2 4743 N / m 2 The compressive strength of corrugated cardboard boxes is significantly improved, reaching 185.2 kPa and 10 minutes and 5 seconds.

[0014] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments without departing from the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing corrugated cardboard plasticized nano-SO2 sol, comprising the following steps: (1) Weigh 1000 g of deionized water and heat it to 50~70℃. Add 10~20 g of sodium carboxymethyl cellulose and stir at a constant temperature until the sodium carboxymethyl cellulose is completely dissolved. (2) Mix gelatin and pectin in equal mass, weigh 3-5g of the mixture and add it to the solution obtained in step (1). Stir until completely dissolved, then add 15-30g of soluble starch and continue stirring until dissolved to obtain a transparent colloidal solution. (3) Cool the colloidal solution to room temperature, add 5-8 g of decanoic acid triglyceride, stir for 10-15 min, then add 4-8 g of ethylene glycol and stir until dissolved to obtain a sol system; (4) Weigh 10-20g of gaseous nano-SiO2 and 5 mL of anhydrous ethanol and pour them into the sol system obtained in step (3). Stir for 20-30 min to make it evenly dispersed in the sol system to obtain the nano-SiO2 sol system. (5) Add 1~3 g of sodium dodecylbenzenesulfonate to the nano SiO2 sol system, stir for 10 min at room temperature, and let stand for 30 min to obtain the product.

2. The preparation method of the corrugated cardboard plasticizing nano-SO2 sol as described in claim 1, wherein: The ethylene glycol mentioned in step (3) is 2000 or 4000.