Folding-resistant damp-proof packaging carton and preparation method thereof

Abstract

The invention belongs to the technical field of packaging carton production, and discloses a folding-resistant damp-proof packaging carton and a preparation method thereof. The folding-resistant moisture-proof packaging carton is prepared from the following raw materials in parts by weight: 70 to 80 parts of papermaking wood flour, 8 to 10 parts of filler, 30 to 40 parts of modified plant fiber, 20 to 30 parts of high-toughness plant fiber-based composite material, 8 to 10 parts of carboxymethyl cellulose and 1 to 2 parts of additive. According to the folding-resistant damp-proof packaging carton and the preparation method thereof, the defects that a packaging carton is prone to being affected with damp, cracks exist after being folded for multiple times, and the packaging carton is difficult to reuse are overcome. Through the modified plant fibers and the high-toughness plant fiber-based composite material, the folding resistance of the packaging carton is effectively improved, and meanwhile, the moisture resistance of the carton is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging carton production, and more specifically to a folding-resistant moisture-proof packaging carton and a preparation method thereof. Background Art

[0002] With the continuous development of economic globalization, online fast-moving consumer goods are playing an increasingly irreplaceable role in solving problems in various fields of society, and the sales of online fast-moving consumer goods are constantly rising. In this context, the demand for packaging cartons is also increasing, and the quality requirements for cartons are also getting higher and higher. The existing carton technology can no longer meet the growing packaging needs in the field of online fast-moving consumer goods.

[0003] The climate is diverse, and the temperature and humidity vary greatly in different regions. Therefore, some packaging cartons sent from dry areas to humid areas are easily affected by moisture, making the packaged items easily damaged. Moreover, most of the current packaging cartons are brittle and have cracks after being folded many times, making them difficult to reuse.

[0004] The existing patent CN108045719A forms a waterproof layer by coating the inner surface of the box body board with a waterproof agent, which can block the entry of water vapor from the inner surface of the carton and achieve effective moisture-proofing. However, this method needs to solve the problem of the adhesion between the moisture-proof agent and the carton and the easy peeling of the moisture-proof agent.

[0005] Therefore, it is very important to develop a foldable and moisture-proof packaging carton and a preparation method thereof. Summary of the invention

[0006] In order to solve the problems in the prior art, the present invention provides a foldable and moisture-proof packaging carton, the raw materials of which include, by weight: 70 to 80 parts of papermaking wood powder, 8 to 10 parts of filler, 30 to 40 parts of modified plant fiber, 20 to 30 parts of high-toughness plant fiber-based composite materials, 8-10 parts of carboxymethyl cellulose, and 1 to 2 parts of additives.

[0007] As a preferred technical solution, the particle size of the papermaking wood powder is 50-200 meshes.

[0008] As a preferred technical solution, the particle size of the papermaking wood powder is 80 meshes.

[0009] As a preferred technical solution, the filler includes: one or more of diatomaceous earth, talc, kaolin, titanium dioxide or gypsum.

[0010] As a preferred technical solution, the filler is kaolin.

[0011] As a preferred technical solution, the particle size of the filler is 300-1000 mesh.

[0012] As a preferred technical solution, the particle size of the filler is 400 mesh.

[0013] As a preferred technical solution, the weight ratio of the modified plant fiber to the high-toughness plant fiber-based composite material is (30-40): (20-30).

[0014] During the experiment, the applicant found that when the weight ratio of the modified plant fiber and the high-toughness plant fiber-based composite material is (30-40): (20-30), while effectively improving the folding resistance of the packaging carton, the moisture-proof performance of the carton is also improved. The applicant speculates that the modified plant fiber improves the original performance of the plant fiber through the modification treatment, so that the bonding force between the fibers is enhanced, and the hydrophobicity is enhanced after the modification, thereby improving the folding resistance and moisture-proof performance of the carton; the fibers in the high-toughness plant fiber-based composite material are intertwined to form a tight network structure, which can better disperse and resist stress when subjected to external forces, thereby extending the service life. In particular, when the weight ratio of the modified plant fiber and the high-toughness plant fiber-based composite material is (30-40): (20-30), the effects of both are fully exerted, greatly improving the folding resistance and moisture-proof performance of the packaging carton.

[0015] As a preferred technical solution, the modified plant fiber includes modified jute fiber.

[0016] As a preferred technical solution, the preparation steps of the modified jute fiber include:

[0017] S1: The jute fiber is immersed in a dopamine hydrochloride solution with a concentration of 1 to 2 g / L for 5 to 10 minutes, filtered, washed, and then dried to obtain a pretreated jute fiber dry sample;

[0018] S2: Mix cardanol glycidyl ether and γ-methacryloxypropyl trimethoxysilane in a weight ratio of (3-8): (1-3), react under an inert atmosphere at 60-80° C. for 1-1.5 hours to obtain cardanol siloxane;

[0019] S3: The pretreated jute fiber dry sample, cardanol siloxane and ethanol are mixed in a weight ratio of (10-20): (60-80): (100-150), filtered, washed, and then dried to obtain modified jute fiber.

[0020] The applicant has found in experiments that the use of cardanol siloxane to modify jute fibers significantly improves the moisture resistance and fiber strength of jute fibers. The possible reason is that the silanol groups or alkoxy groups in cardanol siloxane can be hydrolyzed under certain conditions to produce silanol groups, which can undergo condensation reactions with hydroxyl groups on the surface of jute fibers to form covalent bonds, thereby grafting cardanol siloxane onto jute fibers, thereby improving the water resistance and heat resistance of jute fibers. At the same time, the hydrophobicity of cardanol siloxane can also improve the moisture resistance of jute fibers.

[0021] As a preferred technical solution, the steps for preparing the high-toughness plant fiber-based composite material include:

[0022] S1: melt-blending the modified plant fiber and rosin resin in a weight ratio of (80-100):(8-20) at a blending temperature of 180-200° C. for a blending time of 3-8 min to obtain a high-toughness plant fiber-based composite material mixture;

[0023] S2: The high-toughness plant fiber-based composite material mixture obtained in step S1 is injection molded by an injection molding machine, with a barrel temperature of 170-200° C., a mold temperature of 40-60° C., and a holding time of 5-8 seconds to obtain a high-toughness plant fiber-based composite material.

[0024] As a preferred technical solution, the auxiliary agent is an organosilicon defoamer.

[0025] Another aspect of the present invention discloses a method for preparing a folding-resistant moisture-proof packaging carton, comprising the following steps:

[0026] S1: Weigh required weight portions of papermaking wood powder, filler, modified plant fiber, and high-tenacity plant fiber-based composite material respectively, place them in a grinder, mix and grind them, and obtain a mixture 1;

[0027] S2: Weigh the required weight portions of carboxymethyl cellulose and auxiliary agents respectively, add water to fully dissolve, and stir at a temperature of 80 to 100° C. for 1 to 2 hours to obtain a mixture 2;

[0028] S3: adding mixture 1 to mixture 2, reacting for 4 to 6 hours at 40 to 60 KPa and 120 to 140° C. to obtain mixed pulp;

[0029] S4: placing the mixed pulp obtained in step S3 on a corrugated paper machine for papermaking, pressing, forming, bending, and drying to obtain a finished packaging carton.

[0030] Beneficial Effects

[0031] 1. When the weight ratio of the modified plant fiber and the high-toughness plant fiber-based composite material is (30-40): (20-30), the folding resistance of the packaging carton is effectively improved while also improving the moisture-proof performance of the carton.

[0032] 2. The present invention uses cardanol siloxane to modify jute fiber, thereby improving the hydrophobicity of jute fiber and significantly improving the moisture-proof performance and fiber strength of jute fiber.

[0033] 3. The present invention provides a foldable and moisture-proof packaging carton and a preparation method thereof, which can realize the preparation of the packaging carton through a simple production method, greatly simplifying the production process, eliminating the need for complex production methods, and greatly saving the production costs of packaging carton manufacturers. DETAILED DESCRIPTION

[0034] The experimental methods in the following examples of the present invention without specifying specific conditions are usually carried out under conventional conditions or under conditions recommended by the manufacturers. The various commonly used chemical reagents used in the examples are all commercially available products.

[0035] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] Embodiment 1 of the present invention specifically provides a foldable and moisture-proof packaging carton and a preparation method thereof, wherein the raw materials include, by weight: 70 parts of papermaking wood powder, 8 parts of kaolin, 30 parts of modified plant fiber, 20 parts of high-toughness plant fiber-based composite materials, 8 parts of carboxymethyl cellulose, and 1 part of silicone defoaming agent.

[0038] The papermaking wood powder was purchased from Lingshou County Haibin Mineral Products Trading Co., Ltd., and the particle size was 80 meshes.

[0039] The carboxymethyl cellulose was purchased from Jinan Xinguan Chemical Products Co., Ltd.

[0040] The organosilicon defoamer was purchased from Jiangsu Tengda Additive Co., Ltd., model number TSA-872.

[0041] The kaolin particle size was purchased from Henan Borun Casting Materials Co., Ltd., and the particle size was 400 mesh.

[0042] The preparation steps of the modified jute fiber include:

[0043] S1: The jute fiber is immersed in a dopamine hydrochloride solution with a concentration of 2 g / L for 5 min, filtered, washed, and then dried to obtain a pretreated jute fiber dry sample;

[0044] S2: Mix cardanol glycidyl ether and γ-methacryloxypropyl trimethoxysilane in a weight ratio of 5:2, react under an inert atmosphere at 72° C. for 1 h to obtain cardanol siloxane;

[0045] S3: The pretreated jute fiber dry sample, cardanol siloxane and ethanol are mixed in a weight ratio of 15:77:130, filtered, washed, and then dried to obtain modified jute fiber.

[0046] The jute fiber was purchased from Linyi Yuanma Crafts Co., Ltd.

[0047] The steps for preparing the high-toughness plant fiber-based composite material include:

[0048] S1: melt-blending the modified plant fiber and rosin resin in a weight ratio of 85:10 at a blending temperature of 190° C. for a blending time of 5 min to obtain a high-toughness plant fiber-based composite material mixture;

[0049] S2: The high-toughness plant fiber-based composite material mixture obtained in step S1 is injection molded by an injection molding machine, with a barrel temperature of 180° C., a mold temperature of 50° C., and a holding time of 6 seconds to obtain a high-toughness plant fiber-based composite material.

[0050] The rosin resin was purchased from Jining Sanshi Biotechnology Co., Ltd.

[0051] The method for preparing the folding-resistant moisture-proof packaging carton comprises the following steps:

[0052] S1: Weigh required weight portions of papermaking wood powder, filler, modified plant fiber, and high-tenacity plant fiber-based composite material respectively, place them in a grinder, mix and grind them, and obtain a mixture 1;

[0053] S2: Weigh the required weight portions of carboxymethyl cellulose and auxiliary agents respectively, add water to fully dissolve them, and stir at 90°C for 2h to obtain mixture 2;

[0054] S3: adding mixture 1 to mixture 2, reacting at 53 KPa and 130° C. for 4 h to obtain mixed pulp;

[0055] S4: placing the mixed pulp obtained in step S3 on a corrugated paper machine for papermaking, pressing, forming, bending, and drying to obtain a finished packaging carton.

[0056] Example 2

[0057] Example 2 specifically provides a foldable and moisture-proof packaging carton. The difference between Example 2 and Example 1 is that the raw materials of Example 1 include, by weight: 80 parts of papermaking wood powder, 10 parts of kaolin, 40 parts of modified plant fiber, 30 parts of high-toughness plant fiber-based composite materials, 10 parts of carboxymethyl cellulose, and 2 parts of silicone defoaming agent.

[0058] Comparative Example 1

[0059] Comparative Example 1 specifically provides a folding-resistant moisture-proof packaging carton. The difference between Comparative Example 1 and Example 2 is that the raw material of Comparative Example 1 is replaced by an equal amount of jute fiber instead of modified plant fiber.

[0060] Comparative Example 2

[0061] Comparative Example 2 specifically provides a foldable and moisture-proof packaging carton. The difference between Comparative Example 2 and Example 2 is that the raw material of Comparative Example 2 is 50 parts of modified plant fibers, and no high-toughness plant fiber-based composite materials are used.

[0062] Performance Testing

[0063] 1. Moisture-proof performance test

[0064] The moisture resistance test was carried out according to GB / T 1540-2002 "Determination of water absorption of paper and paperboard - Kebo method". The lower the value, the lower the water absorption of the product and the better the moisture resistance of the product. The test results are shown in Table 1.

[0065] 2. Folding resistance test

[0066] The folding resistance test method is as follows: first, cut a sample of a certain size from the carton, the size is 150mmx15mm. Install the sample on the fixture of the folding resistance tester, apply a tension of 10N, the folding angle is 135°, and the folding speed is 175 times / minute. Start the equipment, let the sample fold back and forth until the sample breaks, and record the number of folds at this time. The test results are shown in Table 1.

[0067] The test results are shown in Table 1.

[0068] Table 1

[0069]

[0070]

[0071] It can be seen from the data in Table 1 that the moisture-proof performance and folding resistance of the folding-resistant moisture-proof packaging carton prepared in Example 2 of the present invention are significantly better than those of the folding-resistant moisture-proof packaging cartons prepared in Example 1 and Comparative Examples 1-2.

Claims

1. A foldable and moisture-proof packaging carton, characterized in that: The raw materials include, by weight: 70-80 parts of papermaking wood powder, 8-10 parts of fillers, 30-40 parts of modified plant fibers, 20-30 parts of high-toughness plant fiber-based composite materials, 8-10 parts of carboxymethyl cellulose, and 1-2 parts of additives.

2. The foldable and moisture-proof packaging carton according to claim 1, characterized in that: The particle size of the papermaking wood powder is 50 to 200 meshes.

3. The foldable and moisture-proof packaging carton according to claim 1, characterized in that: The filler includes one or more of diatomaceous earth, talc, kaolin, titanium dioxide or gypsum.

4. The foldable and moisture-proof packaging carton according to claim 1, characterized in that: The particle size of the filler is 300-1000 meshes.

5. The foldable and moisture-proof packaging carton according to claim 1, characterized in that: The weight ratio of the modified plant fiber to the high-tenacity plant fiber-based composite material is (30-40): (20-30).

6. The foldable and moisture-proof packaging carton according to claim 1, characterized in that: The modified plant fiber includes modified jute fiber.

7. The foldable and moisture-proof packaging carton according to claim 6, characterized in that: The preparation steps of the modified jute fiber include: S1: The jute fiber is immersed in a dopamine hydrochloride solution with a concentration of 1 to 2 g / L for 5 to 10 minutes, filtered, washed, and then dried to obtain a pretreated jute fiber dry sample; S2: Mix cardanol glycidyl ether and γ-methacryloxypropyl trimethoxysilane in a weight ratio of (3-8): (1-3), react under an inert atmosphere at 60-80° C. for 1-1.5 hours to obtain cardanol siloxane; S3: The pretreated jute fiber dry sample, cardanol siloxane and ethanol are mixed in a weight ratio of (10-20): (60-80): (100-150), filtered, washed, and then dried to obtain modified jute fiber.

8. The foldable and moisture-proof packaging carton according to claim 1, characterized in that: The steps for preparing the high-toughness plant fiber-based composite material include: S1: melt-blending the modified plant fiber and rosin resin in a weight ratio of (80-100):(8-20) at a blending temperature of 180-200° C. for a blending time of 3-8 min to obtain a high-toughness plant fiber-based composite material mixture; S2: The high-toughness plant fiber-based composite material mixture obtained in step S1 is injection molded by an injection molding machine, with a barrel temperature of 170-200° C., a mold temperature of 40-60° C., and a holding time of 5-8 seconds to obtain a high-toughness plant fiber-based composite material.

9. The foldable and moisture-proof packaging carton according to claim 8, characterized in that: The auxiliary agent is an organosilicon defoamer.

10. A method for preparing a foldable moisture-proof packaging carton according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Weigh required weight portions of papermaking wood powder, filler, modified plant fiber, and high-tenacity plant fiber-based composite material respectively, place them in a grinder, mix and grind them, and obtain a mixture 1; S2: Weigh the required weight portions of carboxymethyl cellulose and auxiliary agents respectively, add water to fully dissolve, and stir at a temperature of 80 to 100° C. for 1 to 2 hours to obtain a mixture 2; S3: adding mixture 1 to mixture 2, reacting for 4 to 6 hours at 40 to 60 KPa and 120 to 140° C. to obtain mixed pulp; S4: placing the mixed pulp obtained in step S3 on a corrugated paper machine for papermaking, pressing, forming, bending, and drying to obtain a finished packaging carton.

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