Super-tough biodegradable natural polymer composite environment-friendly corrugated board

Abstract

The invention relates to a super-tough biodegradable natural polymer composite environment-friendly corrugated board, and belongs to the technical field of corrugated boards. According to the invention, the super-tough biodegradable natural polymer composite environment-friendly corrugated board is prepared through paste preparation, single-tile processing, composite processing and slitting processing; the preparation method comprises the following steps: stirring water, starch, alkali liquor, amino starch, a stabilizing agent, cardanol glycidyl ether, triallyl borate, an epoxy succinic acid polymer, borax and a bridging agent to prepare paste; the super-tough biodegradable natural polymer composite environment-friendly corrugated board prepared by the preparation method disclosed by the invention has relatively high bonding strength and bursting strength.

Description

Technical Field

[0001] The invention relates to the technical field of corrugated paperboards, in particular to an ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard. Background Art

[0002] With the development of the economy, people's economic ability and aesthetic awareness have been enhanced, and the requirements for packaging quality have been improved. Corrugated boxes are required to not only protect goods and facilitate transportation, but also display goods, beautify goods, and promote sales. Therefore, people are no longer satisfied with the rough production, poor printing quality, and monotonous pattern of single-color carton printing. Cartons are developing towards multi-color and image dot printing.

[0003] Chinese patent CN118880666B relates to the technical field of cardboard products and discloses an environmentally friendly mildew-proof and antibacterial corrugated cardboard and its preparation method. The quaternary ammonium salt substance of the modified terminal isocyanate polyurethane can attack the cell membrane or cell wall of microorganisms, affecting the cell membrane function and causing irreversible damage to the microbial organelle structure; its structure contains the chemical element S, which has strong oxidizing and reducing properties, can destroy the cell membrane of microorganisms, decompose organic matter, and destroy the metabolism and growth environment of mold; the epoxy and isocyanate groups of the modified terminal isocyanate polyurethane can react with the hydroxyl and carboxyl groups on the surface of oxidized cassava starch. At the same time, the dimethylol urea and oligomers in the urea-formaldehyde resin undergo cross-linking reaction with the hydroxyl groups in the starch molecules to form a cross-linked network structure, which prevents water molecules from penetrating into the paper, thereby improving the bonding strength and water resistance of the corrugated cardboard.

[0004] Chinese patent CN222251532U: type relates to a high-strength anti-deformation corrugated cardboard, which belongs to the field of corrugated cardboard technology, including a base plate, an outer reinforcing plate, an inner reinforcing plate, a first corrugated paper, and a second corrugated paper. The outer reinforcing plate and the inner reinforcing plate are respectively arranged on the upper and lower sides of the base plate, and the upper and lower sides of the base plate are respectively fixedly connected with the first corrugated paper and the second corrugated paper, and the upper and lower sides of the base plate are fixedly connected with the first compression rib.

[0005] Chinese patent CN222251534U: discloses a high-strength corrugated cardboard, including an outer cardboard layer and an inner cardboard layer, and also includes a reinforcement component for reinforcing the corrugated cardboard body, and there are multiple reinforcement components, the two sides of the reinforcement component are respectively bonded with a first support plate and a second support plate, the outer side wall of the first support plate is bonded with a first UV-shaped corrugated paper core, the outer side wall of the second support plate is bonded with a second UV-shaped corrugated paper core, and the outer cardboard layer and the inner cardboard layer are respectively bonded with the outer side walls of the first UV-shaped corrugated paper core and the second UV-shaped corrugated paper core.

[0006] The corrugated cardboard prepared by the above patents and prior art has poor bonding strength and bursting strength, which needs to be further improved. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides an ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard, the operation steps of which are as follows: S1 Paste preparation: by weight, add 200-300 parts of water and 30-40 parts of starch, heat to 30-35°C and stir for 3-5 minutes, then add 30-40 parts of alkali solution and stir for 15-30 minutes; Continue adding 750-850 parts of water and stirring for 3-5 minutes, then add 260-320 parts of amino starch and 5-10 parts of alkali solution and stir for 3-5 minutes; add 2-7 parts of stabilizer SB-100 and stir for 20-50 minutes; the amino starch is prepared according to the method in the literature: Preparation of amino starch and its strengthening effect on paper, Section 1.3.2, Preparation of cross-linked amino starch; Continue to add 0.7-2.6 parts of cardanol glycidyl ether, 0.3-0.7 parts of triallyl borate, and 0.5-3.5 parts of epoxysuccinic acid polymer, and stir at 50-65°C for 20-60 minutes; Continue to add 1-4.5 parts of borax, stir for 3-6 minutes, add 10-16 parts of bridging agent F-2921E and stir for 3-5 minutes to form a paste; S2 Single-face corrugated paper station: The base paper is transported forward through the paper splicer, preheating cylinder, single-face corrugated paper machine and over the overpass; S3 Composite Station: After the centers of the corrugated paper are aligned through the overpass, the two corrugated paper tips are coated with paste by the gluing machine, and then enter the laminating machine to be bonded with the face paper; S4 Slitting Station: The cardboard is trimmed and creasing according to specifications by the trimming and creasing machine; then it is cut by the NC cross-cutting knife, and the cardboard is collected and sorted by the automatic stacking machine; thus, the super-tough biodegradable natural polymer composite environmentally friendly corrugated cardboard is obtained.

[0008] The starch is one of wheat starch, potato starch, corn starch and tapioca starch.

[0009] The preheating cylinder heats the base paper by passing steam inside, thereby removing moisture from the base paper and improving its strength; the preheating temperature is 120-150°C.

[0010] The single-corrugated paper machine presses the base paper into corrugated paper through upper and lower corrugated rollers, and then passes through the gluing machine to glue the base paper and the inner paper to form corrugated paper; the preheating temperature is 120-180℃.

[0011] The hot plate part of the laminating machine has 16 hot plates with a width of 600 mm, and high-temperature steam is passed through the inside with a temperature of 120-180°C.

[0012] The NC cross-cutting knife adopts a thin blade with a blade diameter of 270MM and a minimum cutting distance of 135MM.

[0013] Reaction mechanism 1. Reaction of amino starch with cardanol glycidyl ether: Cardanol glycidyl ether (CGE) is an epoxy compound containing a benzene ring and a long unsaturated fatty chain; during the reaction, the amino group of amino starch undergoes a ring-opening addition reaction with the epoxy group of CGE to form a stable chemical bond.

[0014] 2. Reaction of amino starch and epoxy succinic acid polymer: Epoxy succinic acid polymer is a type of polymer material containing multiple epoxy groups; the amino group of amino starch reacts with these epoxy groups to form stable chemical bonds.

[0015] 3. Reaction of amino starch with triallyl borate: Triallyl borate (BTE) is a compound containing multiple allyl groups that can undergo addition reaction with amino groups; this reaction introduces more flexible chain segments, further improving the toughness and impact resistance of the material.

[0016] Technical Effects The starch grafted with functional groups such as cardanol, succinic acid, and borate obtained by the above reaction is used to prepare ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard, which has the following technical effects: 1. Improved Toughness: The introduction of flexible segments and a reinforced cross-linked network structure significantly enhances the material's toughness, maintaining its integrity under significant external forces and making it less susceptible to fracture. By introducing flexible long cardanol chains and an allyl structure, the material's molecular chains become more compliant, allowing them to deform under external forces, thereby absorbing significant energy and reducing brittle fracture. The enhanced cross-linked network structure effectively disperses stress, preventing crack propagation and significantly improving the material's mechanical properties and durability.

[0017] 2. Enhanced biodegradability: Using natural cardanol and starch as raw materials, the prepared material has good biodegradability and can be decomposed in the natural environment, reducing pollution to the environment.

[0018] 3. Improved processing performance: Since the molecular structure of the material has been optimized, it exhibits better fluidity and formability during processing and is suitable for a variety of processing techniques, such as injection molding, extrusion, etc.

[0019] 4. Broad application prospects: The obtained material has excellent mechanical properties. DETAILED DESCRIPTION

[0020] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention object, the following is a detailed description in conjunction with examples and comparative examples: 1. Adhesion strength test: refer to GB / T6548-2011 "Determination of adhesion strength of corrugated cardboard" for measurement.

[0021] 2. Burst strength test: Measured in accordance with GB / T6544-2008.

[0022] Example 1 An ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard, the operation steps of which are as follows: S1 Paste preparation: 200kg water and 30kg starch were heated to 30℃ and stirred for 3min, then 30kg alkali solution was added and stirred for 15min; Continue adding 750 kg of water and stirring for 3 minutes, then add 260 kg of amino starch and 5 kg of alkali solution and stir for 3 minutes; add 2 kg of stabilizer SB-100 and stir for 20 minutes; the amino starch is prepared according to the method in the literature: Preparation of amino starch and its strengthening effect on paper, Section 1.3.2, Preparation of cross-linked amino starch; Continue to add 0.7 kg of cardanol glycidyl ether, 0.3 kg of triallyl borate, and 0.5 kg of epoxysuccinic acid polymer, and stir at 50 ° C for 20 minutes; Continue to add 1kg of borax and stir for 3 minutes, then add 10kg of bridging agent F-2921E and stir for 3 minutes to form a paste; S2 Single-face corrugated paper station: The base paper is transported forward through the paper splicer, preheating cylinder, single-face corrugated paper machine and over the overpass; S3 Composite Station: After the centers of the corrugated paper are aligned through the overpass, the two corrugated paper tips are coated with paste by the gluing machine, and then enter the laminating machine to be bonded with the face paper; S4 Slitting Station: The cardboard is trimmed and creasing according to specifications by the trimming and creasing machine; then it is cut by the NC cross-cutting knife, and the cardboard is collected and sorted by the automatic stacking machine; thus, the super-tough biodegradable natural polymer composite environmentally friendly corrugated cardboard is obtained.

[0023] The starch is wheat starch.

[0024] The preheating cylinder heats the base paper by passing steam inside, thereby removing moisture from the base paper and improving its strength; the preheating temperature is 120°C.

[0025] The single-corrugated machine presses the base paper into corrugated paper through upper and lower corrugated rollers, and then passes through the gluing machine to glue the base paper and the inner paper to form corrugated paper; the preheating temperature is 120℃.

[0026] The hot plate part of the laminating machine has 16 hot plates with a width of 600 mm, and high-temperature steam is passed through the inside with a temperature of 120°C.

[0027] The NC cross-cutting knife adopts a thin blade with a blade diameter of 270MM and a minimum cutting distance of 135MM.

[0028] Example 2 An ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard, the operation steps of which are as follows: S1 Paste preparation: 240 kg water and 33 kg starch were heated to 32 °C and stirred for 4 min, then 33 kg alkali solution was added and stirred for 20 min; Continue to add 780 kg of water and stir for 4 minutes, then add 280 kg of amino starch and 6 kg of alkali solution and stir for 4 minutes; add 4 kg of stabilizer SB-100 and stir for 30 minutes; the amino starch is prepared according to the method in the literature: Preparation of amino starch and its strengthening effect on paper, Section 1.3.2, Preparation of cross-linked amino starch; Continue to add 1.3 kg of cardanol glycidyl ether, 0.4 kg of triallyl borate, and 1.5 kg of epoxysuccinic acid polymer, and stir at 55 ° C for 30 minutes; Continue to add 2kg of borax and stir for 4 minutes, then add 12kg of bridging agent F-2921E and stir for 4 minutes to form a paste; S2 Single-face corrugated paper station: The base paper is transported forward through the paper splicer, preheating cylinder, single-face corrugated paper machine and over the overpass; S3 Composite Station: After the centers of the corrugated paper are aligned through the overpass, the two corrugated paper tips are coated with paste by the gluing machine, and then enter the laminating machine to be bonded with the face paper; S4 Slitting Station: The cardboard is trimmed and creasing according to specifications by the trimming and creasing machine; then it is cut by the NC cross-cutting knife, and the cardboard is collected and sorted by the automatic stacking machine; thus, the super-tough biodegradable natural polymer composite environmentally friendly corrugated cardboard is obtained.

[0029] The starch is one of wheat starch, potato starch, corn starch and tapioca starch.

[0030] The preheating cylinder heats the base paper by passing steam through it, thereby removing moisture from the base paper and improving its strength; the preheating temperature is 130°C.

[0031] The single-corrugated machine presses the base paper into corrugated paper through upper and lower corrugated rollers, and then passes through the gluing machine to glue the base paper and the inner paper to form corrugated paper; the preheating temperature is 140℃.

[0032] The hot plate part of the laminating machine has 16 hot plates with a width of 600 mm, and high-temperature steam is passed through the inside with a temperature of 140°C.

[0033] The NC cross-cutting knife adopts a thin blade with a blade diameter of 270MM and a minimum cutting distance of 135MM.

[0034] Example 3 An ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard, the operation steps of which are as follows: S1 Paste preparation: 280kg water and 38kg starch were heated to 34℃ and stirred for 4min, then 38kg alkali solution was added and stirred for 25min; 830 kg of water was added and stirred for 4 minutes, followed by 300 kg of amino starch and 8 kg of alkali solution, and stirring for 4 minutes. 6 kg of stabilizer SB-100 was added and stirred for 40 minutes. The amino starch was prepared according to the method in the literature: Preparation of amino starch and its strengthening effect on paper, Section 1.3.2, Preparation of cross-linked amino starch. Continue to add 2.1 kg of cardanol glycidyl ether, 0.6 kg of triallyl borate, and 2.5 kg of epoxysuccinic acid polymer, and stir at 60 ° C for 50 minutes; Continue to add 3kg of borax and stir for 5 minutes, then add 14kg of bridging agent F-2921E and stir for 4 minutes to form a paste; S2 Single-face corrugated paper station: The base paper is transported forward through the paper splicer, preheating cylinder, single-face corrugated paper machine and over the overpass; S3 Composite Station: After the centers of the corrugated paper are aligned through the overpass, the two corrugated paper tips are coated with paste by the gluing machine, and then enter the laminating machine to be bonded with the face paper; S4 Slitting Station: The cardboard is trimmed and creasing according to specifications by the trimming and creasing machine; then it is cut by the NC cross-cutting knife, and the cardboard is collected and sorted by the automatic stacking machine; thus, the super-tough biodegradable natural polymer composite environmentally friendly corrugated cardboard is obtained.

[0035] The starch is potato.

[0036] The preheating cylinder heats the base paper by passing steam inside, thereby removing moisture from the base paper and improving its strength; the preheating temperature is 140°C.

[0037] The single-corrugated machine presses the base paper into corrugated paper through upper and lower corrugated rollers, and then passes through the gluing machine to glue the base paper and the inner paper to form corrugated paper; the preheating temperature is 160℃.

[0038] The hot plate part of the laminating machine has 16 hot plates with a width of 600 mm, and high-temperature steam is passed through the inside with a temperature of 160°C.

[0039] The NC cross-cutting knife adopts a thin blade with a blade diameter of 270MM and a minimum cutting distance of 135MM.

[0040] Example 4 An ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard, the operation steps of which are as follows: S1 Paste preparation: 300kg water and 40kg starch were heated to 35℃ and stirred for 5min, then 40kg alkali solution was added and stirred for 30min; Continue to add 850kg of water and stir for 5 minutes, then add 320kg of amino starch and 10kg of alkali solution and stir for 5 minutes; add 7kg of stabilizer SB-100 and stir for 50 minutes; the amino starch is prepared according to the method in the literature: Preparation of amino starch and its strengthening effect on paper, Section 1.3.2, Preparation of cross-linked amino starch; Continue to add 2.6 kg of cardanol glycidyl ether, 0.7 kg of triallyl borate, and 3.5 kg of epoxysuccinic acid polymer, and stir at 65 ° C for 60 minutes; Continue to add 4.5kg of borax and stir for 6 minutes, then add 16kg of bridging agent F-2921E and stir for 5 minutes to form a paste; S2 Single-face corrugated paper station: The base paper is transported forward through the paper splicer, preheating cylinder, single-face corrugated paper machine and over the overpass; S3 Composite Station: After the centers of the corrugated paper are aligned through the overpass, the two corrugated paper tips are coated with paste by the gluing machine, and then enter the laminating machine to be bonded with the face paper; S4 Slitting Station: The cardboard is trimmed and creasing according to specifications by the trimming and creasing machine; then it is cut by the NC cross-cutting knife, and the cardboard is collected and sorted by the automatic stacking machine; thus, the super-tough biodegradable natural polymer composite environmentally friendly corrugated cardboard is obtained.

[0041] The starch is tapioca starch.

[0042] The preheating cylinder heats the base paper by passing steam through it, thereby removing moisture from the base paper and improving its strength; the preheating temperature is 150°C.

[0043] The single-corrugated machine presses the base paper into corrugated paper through upper and lower corrugated rollers, and then passes through the gluing machine to glue the base paper and the inner paper to form corrugated paper; the preheating temperature is 180℃.

[0044] The hot plate part of the laminating machine has 16 hot plates with a width of 600 mm, and high-temperature steam is passed through the inside with a temperature of 180°C.

[0045] The NC cross-cutting knife adopts a thin blade with a blade diameter of 270MM and a minimum cutting distance of 135MM.

[0046] Comparative Example 1 The same procedures as in Example 1 were followed except that cardanol glycidyl ether, triallyl borate and epoxysuccinic acid polymer were not added.

[0047] Comparative Example 2 Without adding cardanol glycidyl ether, the other steps were the same as in Example 1.

[0048] Comparative Example 3 The epoxysuccinic acid polymer was not added, and the other steps were the same as in Example 1.

[0049] The test results are shown in Table 1: Table 1 Through the data analysis of the above examples and comparative examples, the ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard prepared by the present invention has high bonding strength and bursting strength.

[0050] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard, the operation steps of which are as follows: S1 Paste preparation: by weight, add 200-300 parts of water and 30-40 parts of starch, heat to 30-35°C and stir for 3-5 minutes, then add 30-40 parts of alkali solution and stir for 15-30 minutes; Continue to add 750-850 parts of water and stir for 3-5 minutes, then add 260-320 parts of amino starch and 5-10 parts of alkali solution and stir for 3-5 minutes; add 2-7 parts of stabilizer and stir for 20-50 minutes; Continue to add 0.7-2.6 parts of cardanol glycidyl ether, 0.3-0.7 parts of triallyl borate, and 0.5-3.5 parts of epoxysuccinic acid polymer, and stir at 50-65°C for 20-60 minutes; Continue to add 1-4.5 parts of borax and stir for 3-6 minutes, then add 10-16 parts of bridging agent and stir for 3-5 minutes to form a paste; S2 Single-face corrugated paper station: The base paper is transported forward through the paper splicer, preheating cylinder, single-face corrugated paper machine and over the overpass; S3 Composite Station: After the centers of the corrugated paper are aligned through the overpass, the two corrugated paper tips are coated with paste by the gluing machine, and then enter the laminating machine to be bonded with the face paper; S4 Slitting Station: Cardboard is trimmed and pressed according to specifications by the trimming and creasing machine; then it is cut by the NC cross-cutting knife, and the cardboard is collected and sorted by the automatic stacking machine; The ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard is obtained.

2. The ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard according to claim 1, characterized in that: The starch is one of wheat starch, potato starch, corn starch and tapioca starch.

3. The ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard according to claim 1, characterized in that: The preheating cylinder heats the base paper by passing steam inside, thereby removing moisture from the base paper and improving its strength; the preheating temperature is 120-150°C.

4. The ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard according to claim 1, characterized in that: The single-corrugated paper machine presses the base paper into corrugated paper through upper and lower corrugated rollers, and then passes through the gluing machine to glue the base paper and the inner paper to form corrugated paper; the preheating temperature is 120-180℃.

5. The ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard according to claim 1, characterized in that: The hot plate part of the laminating machine has 16 hot plates with a width of 600 mm, and high-temperature steam is passed through the inside with a temperature of 120-180°C.

6. The ultra-tough biodegradable natural polymer composite environmentally friendly corrugated paperboard according to claim 1, characterized in that: The NC cross-cutting knife adopts a thin blade with a blade diameter of 270MM and a minimum cutting distance of 135MM.

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