CN116100912B - High-strength corrugated composite paperboard and processing technology thereof - Google Patents

High-strength corrugated composite paperboard and processing technology thereof Download PDF

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Publication number
CN116100912B
CN116100912B CN202211284234.4A CN202211284234A CN116100912B CN 116100912 B CN116100912 B CN 116100912B CN 202211284234 A CN202211284234 A CN 202211284234A CN 116100912 B CN116100912 B CN 116100912B
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corrugated
paper
solution
layer
adhesive
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CN116100912A (en
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帅印
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Nantong Zhongtai Packaging Technology Co ltd
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Nantong Zhongtai Packaging Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/08—Corrugated paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B29/005—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to another layer of paper or cardboard layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/08—Macromolecular additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J151/00—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J151/02—Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers grafted on to polysaccharides
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M16/00—Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
    • D06M16/003—Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic with enzymes or microorganisms
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
    • B32B2037/243—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/12—Coating on the layer surface on paper layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/28—Multiple coating on one surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
    • D06M2101/02—Natural fibres, other than mineral fibres
    • D06M2101/04—Vegetal fibres
    • D06M2101/06—Vegetal fibres cellulosic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
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  • Biochemistry (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Laminated Bodies (AREA)

Abstract

The invention discloses a high-strength corrugated composite paperboard and a processing technology thereof. The high-strength corrugated composite paperboard is formed by compositing a face paper layer, a corrugated paper core and an inner paper layer from top to bottom in sequence; the corrugated paper core sequentially comprises corrugated paper base paper, linen fabric and corrugated paper base paper from top to bottom; the outer surface of the surface paper layer and the inner surface of the inner paper layer are coated with waterproof layers. The processing technology comprises the following steps: step 1: the flax fabric is placed in laccase-acetic acid buffer solution, immersed for 2 to 3 hours at 50 to 55 ℃, and oxygen is introduced in the reaction process; placing the mixture in an adhesive for gum dipping; covering the corrugated paper on corrugated base paper, covering a layer of corrugated base paper, and heating and embossing at 100-105 ℃ to obtain a wavy corrugated paper core; step 2: compounding the surface paper layer, the corrugated paper core and the inner paper layer by using an adhesive; and coating waterproof layers on the outer surface of the surface paper layer and the inner surface of the inner paper layer to obtain the high-strength corrugated composite paperboard.

Description

High-strength corrugated composite paperboard and processing technology thereof
Technical Field
The invention relates to the technical field of corrugated boards, in particular to a high-strength corrugated composite board and a processing technology thereof.
Background
Corrugated board is a multi-layer adhesive comprising at least one corrugated medium layer. Compared with other packaging materials, the packaging material has the advantages of printing, light weight, recoverability, good buffering performance and the like, and is one of the most widely used materials in the packaging field. With the acceleration of the modern process and the improvement of life quality, the requirements of people on the water resistance and strength performance of the corrugated board are higher and higher. The common corrugated paper has certain mechanical strength, and can offset certain collision and friction in the carrying process, but when encountering cargoes with higher bearing, the common corrugated paper has obvious defect of compressive strength, so that the composite paperboard is easy to deform, bend or collapse in the carrying process, and damage the cargoes. Meanwhile, the corrugated board has hygroscopicity due to the limitation of raw materials, is easy to damp and corrode, and has the problems of collapse, goods damage and the like; making it difficult to maintain good structural stability in rainy seasons or weather with large changes in humidity.
In the prior art, the rigidity is generally improved and the strength is enhanced by adding inorganic substances into corrugated base paper, but uneven dispersion of the inorganic substances in the process can cause damage in the embossing process and affect the strength. The adhesive used has no toughness, so that the paperboard is swelled and then dried in the preparation step in the compounding process, and the strength of the corrugated paperboard is affected. Meanwhile, the used adhesive is generally not waterproof, so that the wet bonding strength is not high.
In conclusion, the problems are solved, and the preparation of the high-strength corrugated composite paperboard and the processing technology thereof have important significance.
Disclosure of Invention
The invention aims to provide a high-strength corrugated composite paperboard and a processing technology thereof, which are used for solving the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
The processing technology of the high-strength corrugated composite paperboard comprises the steps of compositing a face paper layer, a corrugated paper core and an inner paper layer from top to bottom in sequence; the corrugated paper core sequentially comprises corrugated paper base paper, linen fabric and corrugated paper base paper from top to bottom; the outer surface of the surface paper layer and the inner surface of the inner paper layer are coated with waterproof layers.
The method comprises the following steps:
Step 1: the flax fabric is placed in laccase-acetic acid buffer solution, immersed for 2 to 3 hours at 50 to 55 ℃, and oxygen is introduced in the reaction process; placing the mixture in an adhesive for gum dipping; covering the corrugated paper on corrugated base paper, covering a layer of corrugated base paper, and heating and embossing at 100-105 ℃ to obtain a wavy corrugated paper core;
step 2: compounding the surface paper layer, the corrugated paper core and the inner paper layer by using an adhesive; and coating waterproof layers on the outer surface of the surface paper layer and the inner surface of the inner paper layer to obtain the high-strength corrugated composite paperboard.
More preferably, the raw materials of the adhesive comprise the following components: 50 to 60 parts of starch, 1 to 1.5 parts of sodium dodecyl benzene sulfonate, 1 to 2 parts of vinyl acetate, 2 to 4 parts of titanium dioxide compound and 0.2 to 0.5 part of ammonium persulfate by weight; the concentration of the vinyl acetate suspension is 1.0wt% to 1.2wt% of vinyl acetate aqueous solution.
More optimally, the preparation method of the adhesive comprises the following steps: placing starch in hydrochloric acid solution, and stirring for 1.5-2 hours at 58-62 ℃; adding liquefied soybean protein to adjust the pH to be neutral, setting the temperature to be 82-86 ℃ and stirring for 1-2 hours; sequentially adding sodium dodecyl benzene sulfonate, titanium dioxide compound and ammonium persulfate, and uniformly mixing; adding hydrochloric acid to adjust pH=4-5, and dripping vinyl acetate suspension for 1-2 hours; setting the temperature to be 70-80 ℃ for reaction for 1-1.5 hours, cooling, and adding liquefied soy protein again to adjust the pH to be 6.2-6.5, thus obtaining the adhesive.
More optimally, the preparation method of the liquefied soybean protein comprises the following steps: uniformly mixing 1.4wt% -1.6wt% of sodium sulfite, 4.5wt% -5.5wt% of urea and 1.4wt% -1.6wt% of sodium dodecyl benzene sulfonate, setting the temperature to be 72-78 ℃, adding 12wt% -14wt% of soybean protein powder, slowly adding 3wt% -3.5wt% of sodium hydroxide, and stirring for reacting for 1-2 hours to obtain liquefied soybean protein.
More optimally, the preparation method of the titanium dioxide compound comprises the following steps: dispersing titanium dioxide nano particles in ethanol, adding gamma-methacryloxypropyl trimethoxy silane, and stirring for 2 hours at 50-52 ℃; adding sodium dodecyl benzene sulfonate, setting the temperature at 70-75 ℃, adding ammonium persulfate, dropwise adding butyl acrylate, and stirring for reaction for 0.5-1 hour; precipitating with sodium chloride solution, washing, and drying to obtain the titanium dioxide compound.
More optimally, the mass ratio of the titanium dioxide nano particles to the gamma-methacryloxypropyl trimethoxy silane is 10 (7-7.5); the addition amount of the butyl acrylate accounts for 1 to 2 weight percent of the mass of the titanium dioxide nano particles; the concentration of the sodium chloride solution is 5-8wt%.
More optimally, the coating method of the waterproof layer comprises the following steps: (1) 10wt% of starch is added into deionized water, and gelatinization is carried out for 30 minutes at the temperature of 90-100 ℃; adding 50wt% of calcium carbonate, uniformly mixing, setting the temperature to 70-80 ℃, uniformly stirring, and preserving heat to obtain a solution A; (2) Dissolving polylactic acid in chloroform solution to obtain solution B with the concentration of 0.1-0.15%w/v; (3) Uniformly coating the solution A on the outer surface of the surface paper layer, and drying; spraying the solution B on the surface of the water-proof layer by means of electrospraying, and drying to obtain the water-proof layer; the inner surface of the inner paper layer is coated with a waterproof layer in the same manner.
More optimally, the grain diameter of the calcium carbonate is 0.5-0.8 mu m; the parameters of the electrospray are as follows: the diameter of the spray head is 1.2-1.25 mm, the voltage is 15-17 kv, and the spraying distance is 18-21 cm; the spraying speed is 0.7-0.8 mL/h; the spraying time is 20-25 minutes.
More optimally, the high-strength corrugated composite paperboard is prepared by the processing technology of the high-strength corrugated composite paperboard.
In the technical scheme, flax fabrics are compounded between two layers of corrugated base paper; the strength of the corrugated composite paperboard is improved; the waterproof layers are arranged on the outer surface and the inner surface of the paperboard, so that the application range of the paperboard is increased, and the limitation of weather environment is broken; the strength, the waterproof property and the toughness of the corrugated composite paperboard are further improved by preparing the adhesive.
(1) In the scheme, the reticular linen fabric is firstly strengthened and subjected to hydrophobic treatment in laccase; the oxidation of laccase is utilized to enhance the strength of the linen fabric; and then dipping, pressing the adhesive between the corrugated base papers, and enhancing the interaction between the liquefied soy protein and the starch by utilizing residual laccase, so that the adhesive has the advantages of easy embossing treatment, crack generation reduction and corrugated paper strength enhancement.
(2) The waterproof layer is formed by sequentially coating starch solution and polylactic acid solution, and compared with the addition of hydrophobic substances in other patents, the waterproof layer in the technical scheme has simple chemical components, and generates higher hydrophobicity by utilizing the roughness difference generated between the two layers, so that the corrugated composite board is prevented from being wetted. While also enhancing impact resistance.
The content of calcium carbonate and the particle size of the particles are defined in the scheme, because: the starch solution coating and polylactic acid solution deposition have a synergistic effect, which causes the surface roughness to change, thereby changing the hydrophobicity. In the starch solution, when the particle size of the calcium carbonate is too high, the surface presents a reduced porous area, so that polylactic acid particle deposition cannot be filled in a starch film structure, and proper surface roughness cannot be generated. In order to control the size of polylactic acid deposited on the surface particles, parameters of electrospray and concentration of polylactic acid are defined in the scheme, and because of the concentration increase and the parameter change, firstly, smaller polylactic acid particles are generated, the polylactic acid particles are aggregated to form larger particles, secondly, the larger particles are directly formed, and the polylactic acid particles cannot be embedded in pores of a starch film due to oversized particles, so that the surface roughness structure is changed, and the hydrophobicity is reduced. Therefore, through the definition of two solution components and the definition of spraying parameters in the scheme, the sediment of the two layers of solutions are cooperated to form proper nano-scale roughness, so that the water resistance of the surface of the paperboard is enhanced.
(3) In the preparation process of the adhesive, firstly, vinyl acetate is grafted on starch, so that the toughness of the adhesive in the hot rolling process is enhanced. Secondly, the butyl acrylate is coupled to the titanium dioxide, so that the dispersibility and the compatibility of the nano particles are improved, the problem of the dispersibility of inorganic particles is solved, and meanwhile, the cohesiveness and the water resistance of the starch-based adhesive are enhanced; meanwhile, as the titanium dioxide compound has a sliding effect in the embossing process, the embrittlement of paper in the embossing process is effectively reduced, so that the strength is reduced; thirdly, the liquefied soy protein is used as a pH regulator, and the addition of the liquefied soy protein increases cohesiveness and waterproofness; compared with the direct addition of sodium hydroxide for regulation, the direct addition of soy protein increases the operability of the reaction, because if the soy protein is directly added, the reaction viscosity is increased, the preparation of the adhesive is not easy, and the coating is not urgent. In the scheme, soybean protein is liquefied in alkaline substances, and pyrolyzed to generate low-molecular peptide chains, so that the viscosity of the soybean protein is effectively increased, and the soybean protein is added into the reaction, so that the viscosity is less increased, and the reaction is facilitated. Meanwhile, the liquefied soybean protein enhances the bonding strength and hydrolysis resistance of the adhesive.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
Step 1: dissolving laccase in an acetic acid buffer solution to obtain a laccase-acetic acid buffer solution with the concentration of 10mg/mL and the pH value of=5.2; the flax fabric is placed in laccase-acetic acid buffer solution, immersed for 2.5 hours at 52 ℃, and oxygen is introduced in the reaction process; transferring to an adhesive for dipping for 5 seconds, and removing redundant adhesive; covering the corrugated paper with a layer of corrugated paper, and heating at 105deg.C for embossing to obtain wavy corrugated paper core.
Step 2: (1) Preparing 1.8 parts of vinyl acetate into a 1wt% vinyl acetate suspension for later use; uniformly mixing 1.5wt% of sodium sulfite, 5.0wt% of urea and 1.5wt% of sodium dodecyl benzene sulfonate, setting the temperature to 75 ℃, adding 13wt% of soybean protein powder, slowly adding 3.2wt% of sodium hydroxide, and stirring for reacting for 2 hours to obtain liquefied soybean protein for later use; 1g of titanium dioxide nanoparticles are dispersed in 50mL of ethanol, 0.72g of gamma-methacryloxypropyl trimethoxysilane is added and stirred at 50 ℃ for 2 hours; adding 0.8g of sodium dodecyl benzene sulfonate, setting the temperature to 75 ℃, adding 0.1g of ammonium persulfate, dropwise adding 0.015 g of butyl acrylate, and stirring for reaction for 1 hour; precipitating with 5wt% sodium chloride solution, washing, and drying to obtain titanium dioxide compound for use.
(2) 55G of starch is placed in hydrochloric acid solution and stirred for 2 hours at 60 ℃; adding liquefied soybean protein to adjust pH to neutrality, setting temperature to 85deg.C, and stirring for 1.5 hr; sequentially adding 1.2g of sodium dodecyl benzene sulfonate, 3g of titanium dioxide compound and 0.25g of ammonium persulfate, and uniformly mixing; adding hydrochloric acid to adjust the pH to be 4.6, and dropwise adding vinyl acetate suspension for 1 hour; the reaction was carried out at 75 ℃ for 1 hour, cooled, and liquefied soy protein was added again to adjust ph=6.4, to obtain an adhesive.
Step 3: (1) Compounding the surface paper layer, the corrugated paper core and the inner paper layer by using an adhesive; (2) 10wt% starch was added to deionized water and set at 95℃for gelatinization for 30 minutes; adding 50wt% of 0.65 mu m calcium carbonate, uniformly mixing, setting the temperature to 75 ℃, uniformly stirring, and preserving heat to obtain a solution A; dissolving polylactic acid in chloroform solution to obtain solution B with the concentration of 0.12% w/v; (3) Uniformly coating the solution A on the outer surface of the surface paper layer, and drying at 80 ℃ for 1 minute; and then spraying a solution B on the surface of the material by an electrospraying mode, wherein the parameters of the electrospraying are as follows: the diameter of the spray head is 1.2mm, the voltage is 16kv, and the spraying distance is 20cm; the spraying speed is 0.8mL/h; spraying for 20 minutes, and drying to obtain a waterproof layer; and coating a waterproof layer on the inner surface of the inner paper layer in the same way to obtain the high-strength corrugated composite paperboard.
Example 2:
Step 1: dissolving laccase in an acetic acid buffer solution to obtain a laccase-acetic acid buffer solution with the concentration of 10mg/mL and the pH value of=5.2; the flax fabric is placed in laccase-acetic acid buffer solution, immersed for 2 hours at 50 ℃, and oxygen is introduced in the reaction process; transferring to an adhesive for dipping for 5 seconds, and removing redundant adhesive; covering the corrugated paper with a layer of corrugated paper, and heating at 100deg.C to emboss to obtain wavy corrugated paper core.
Step 2: (1) Preparing 1 part of vinyl acetate into a 1wt% vinyl acetate suspension for later use; uniformly mixing 1.4wt% of sodium sulfite, 4.5wt% of urea and 1.4wt% of sodium dodecyl benzene sulfonate, setting the temperature to 72 ℃, adding 12wt% of soybean protein powder, slowly adding 3wt% of sodium hydroxide, and stirring for reacting for 1 hour to obtain liquefied soybean protein for later use; 1g of titanium dioxide nanoparticles are dispersed in 50mL of ethanol, 0.7g of gamma-methacryloxypropyl trimethoxysilane is added and stirred at 50 ℃ for 2 hours; 0.8g of sodium dodecyl benzene sulfonate is added, the temperature is set to 70 ℃, 0.1g of ammonium persulfate is added, 0.01g of butyl acrylate is added dropwise, and the mixture is stirred for reaction for 0.5 hour; precipitating with 5wt% sodium chloride solution, washing, and drying to obtain titanium dioxide compound for use.
(2) 50G of starch are placed in a hydrochloric acid solution and stirred for 1.5 hours at 58 ℃; adding liquefied soybean protein to adjust pH to neutrality, setting temperature to 82 deg.C, and stirring for 1 hr; sequentially adding 1g of sodium dodecyl benzene sulfonate, 2g of titanium dioxide compound and 0.2g of ammonium persulfate, and uniformly mixing; adding hydrochloric acid to adjust the pH to be 4, and dropwise adding vinyl acetate suspension for 1 hour; the reaction was carried out at 70℃for 1 hour, cooled, and the liquefied soy protein was added again to adjust pH=6.2, to give an adhesive.
Step 3: (1) Compounding the surface paper layer, the corrugated paper core and the inner paper layer by using an adhesive; (2) 10wt% starch was added to deionized water and gelatinized for 30 minutes at 90 ℃; adding 50wt% of 0.5 mu m calcium carbonate, uniformly mixing, setting the temperature to 70 ℃, uniformly stirring, and preserving heat to obtain a solution A; dissolving polylactic acid in chloroform solution to obtain solution B with the concentration of 0.1% w/v; (3) Uniformly coating the solution A on the outer surface of the surface paper layer, and drying at 80 ℃ for 1 minute; and then spraying a solution B on the surface of the material by an electrospraying mode, wherein the parameters of the electrospraying are as follows: the diameter of the spray head is 1.25mm, the voltage is 17kv, and the spraying distance is 21cm; the spraying speed is 0.8mL/h; spraying for 25 minutes, and drying to obtain a waterproof layer; and coating a waterproof layer on the inner surface of the inner paper layer in the same way to obtain the high-strength corrugated composite paperboard.
Example 3:
Step 1: dissolving laccase in an acetic acid buffer solution to obtain a laccase-acetic acid buffer solution with the concentration of 10mg/mL and the pH value of=5.2; the flax fabric is placed in laccase-acetic acid buffer solution, immersed for 3 hours at 55 ℃, and oxygen is introduced in the reaction process; transferring to an adhesive for dipping for 5 seconds, and removing redundant adhesive; covering the corrugated paper with a layer of corrugated paper, and heating at 105deg.C for embossing to obtain wavy corrugated paper core.
Step 2: (1) Preparing 2 parts of vinyl acetate into a 1.2wt% vinyl acetate suspension for later use; uniformly mixing 1.6wt% of sodium sulfite, 5.5wt% of urea and 1.6wt% of sodium dodecyl benzene sulfonate, setting the temperature to 78 ℃, adding 14wt% of soybean protein powder, slowly adding 3.5wt% of sodium hydroxide, and stirring for reacting for 2 hours to obtain liquefied soybean protein for later use; 1g of titanium dioxide nanoparticles were dispersed in 50mL of ethanol, 0.75g of gamma-methacryloxypropyl trimethoxysilane was added, and stirred at 52℃for 2 hours; 0.8g of sodium dodecyl benzene sulfonate is added, the temperature is set to be 75 ℃, 0.1g of ammonium persulfate is added, 0.02g of butyl acrylate is added dropwise, and the mixture is stirred for reaction for 1 hour; precipitating with 8wt% sodium chloride solution, washing, and drying to obtain titanium dioxide compound for use.
(2) 60G of starch is placed in hydrochloric acid solution and stirred for 2 hours at 62 ℃; adding liquefied soybean protein to adjust pH to neutrality, setting temperature to 86 deg.C, and stirring for 2 hr; sequentially adding 1.5g of sodium dodecyl benzene sulfonate, 4g of titanium dioxide compound and 0.5g of ammonium persulfate, and uniformly mixing; adding hydrochloric acid to adjust the pH to be=5, and dropwise adding vinyl acetate suspension for 2 hours; the reaction was carried out at 80℃for 1.5 hours, cooled, and the liquefied soy protein was added again to adjust pH=6.5, to give an adhesive.
Step 3: (1) Compounding the surface paper layer, the corrugated paper core and the inner paper layer by using an adhesive; (2) 10wt% starch was added to deionized water and gelatinized for 30 minutes at 100 ℃ set; adding 50wt% of 0.8 mu m calcium carbonate, uniformly mixing, setting the temperature to 80 ℃, uniformly stirring, and preserving heat to obtain a solution A; dissolving polylactic acid in chloroform solution to obtain solution B with the concentration of 0.15% w/v; (3) Uniformly coating the solution A on the outer surface of the surface paper layer, and drying at 80 ℃ for 1 minute; and then spraying a solution B on the surface of the material by an electrospraying mode, wherein the parameters of the electrospraying are as follows: the diameter of the spray head is 1.2mm, the voltage is 15kv, and the spraying distance is 18cm; the spraying speed is 0.7mL/h; spraying for 20 minutes, and drying to obtain a waterproof layer; and coating a waterproof layer on the inner surface of the inner paper layer in the same way to obtain the high-strength corrugated composite paperboard.
Comparative example 1: flax fabric was not added, the remainder being the same as in example 1.
The specific modification is as follows:
Step 1: and bonding the two pieces of corrugated base paper through an adhesive, and heating and embossing at 105 ℃ to obtain the wavy corrugated paper core.
Comparative example 2: the flax fabric was not laccase treated and the remainder was identical to example 1.
The specific modification is as follows:
Step 1: placing the linen fabric in an adhesive for gum dipping for 5 seconds, and removing redundant gum; covering the corrugated paper with a layer of corrugated paper, and heating at 105deg.C for embossing to obtain wavy corrugated paper core.
Comparative example 3: the solubility of polylactic acid in the waterproof layer was adjusted to 0.3% w/v, and the rest was the same as in example 1.
The specific modification is as follows:
Step 3: (1) Compounding the surface paper layer, the corrugated paper core and the inner paper layer by using an adhesive; (2) 10wt% starch was added to deionized water and set at 95℃for gelatinization for 30 minutes; adding 50wt% of 0.65 mu m calcium carbonate, uniformly mixing, setting the temperature to 75 ℃, uniformly stirring, and preserving heat to obtain a solution A; dissolving polylactic acid in chloroform solution to obtain solution B with the concentration of 0.3% w/v; (3) Uniformly coating the solution A on the outer surface of the surface paper layer, and drying at 80 ℃ for 1 minute; and then spraying a solution B on the surface of the material by an electrospraying mode, wherein the parameters of the electrospraying are as follows: the diameter of the spray head is 1.2mm, the voltage is 16kv, and the spraying distance is 20cm; the spraying speed is 0.8mL/h; spraying for 20 minutes, and drying to obtain a waterproof layer; and coating a waterproof layer on the inner surface of the inner paper layer in the same way to obtain the high-strength corrugated composite paperboard.
Comparative example 4: the particle diameter of the calcium carbonate particles was adjusted to 1. Mu.m, and the rest was the same as in example 1.
The specific modification is as follows:
Step 3: (1) Compounding the surface paper layer, the corrugated paper core and the inner paper layer by using an adhesive; (2) 10wt% starch was added to deionized water and set at 95℃for gelatinization for 30 minutes; adding 50wt% of 1 mu m calcium carbonate, uniformly mixing, setting the temperature to 75 ℃, uniformly stirring, and preserving heat to obtain a solution A; dissolving polylactic acid in chloroform solution to obtain solution B with the concentration of 0.12% w/v; (3) Uniformly coating the solution A on the outer surface of the surface paper layer, and drying at 80 ℃ for 1 minute; and then spraying a solution B on the surface of the material by an electrospraying mode, wherein the parameters of the electrospraying are as follows: the diameter of the spray head is 1.2mm, the voltage is 16kv, and the spraying distance is 20cm; the spraying speed is 0.8mL/h; spraying for 20 minutes, and drying to obtain a waterproof layer; and coating a waterproof layer on the inner surface of the inner paper layer in the same way to obtain the high-strength corrugated composite paperboard.
Comparative example 5: instead of liquefying soy protein, soy protein and sodium hydroxide were directly added, and the rest was the same as in example 1.
The specific modification is as follows:
Step 2: (2) 55g of starch is placed in hydrochloric acid solution and stirred for 2 hours at 60 ℃; adding 10M sodium hydroxide to adjust pH to neutrality, adding 5g soybean protein, setting temperature to 85deg.C, and stirring for 1.5 hr; sequentially adding 1.2g of sodium dodecyl benzene sulfonate, 3g of titanium dioxide compound and 0.25g of ammonium persulfate, and uniformly mixing; adding hydrochloric acid to adjust the pH to be 4.6, and dropwise adding vinyl acetate suspension for 1 hour; the reaction was carried out at 75℃for 1 hour, cooled, and 10M sodium hydroxide was added to adjust pH=6.4, to give an adhesive.
Comparative example 6: the titanium dioxide composite was replaced with nano titanium dioxide, and the rest was the same as in example 1.
The specific modification is as follows:
step 2: (2) 55g of starch is placed in hydrochloric acid solution and stirred for 2 hours at 60 ℃; adding liquefied soybean protein to adjust pH to neutrality, setting temperature to 85deg.C, and stirring for 1.5 hr; sequentially adding 1.2g of sodium dodecyl benzene sulfonate, 3g of nano titanium dioxide and 0.25g of ammonium persulfate, and uniformly mixing; adding hydrochloric acid to adjust the pH to be 4.6, and dropwise adding vinyl acetate suspension for 1 hour; the reaction was carried out at 75 ℃ for 1 hour, cooled, and liquefied soy protein was added again to adjust ph=6.4, to obtain an adhesive.
Comparative example 7: the procedure of example 1 was repeated except that the vinyl acetate modified starch was not added.
The specific modification is as follows:
Step 2: (2) 55g of starch is placed in hydrochloric acid solution and stirred for 2 hours at 60 ℃; adding liquefied soybean protein to adjust pH to neutrality, setting temperature to 85deg.C, and stirring for 1.5 hr; sequentially adding 1.2g of sodium dodecyl benzene sulfonate and 3g of titanium dioxide compound; adding hydrochloric acid to adjust the pH to be 4.6, cooling, and adding liquefied soybean protein again to adjust the pH to be 6.4, thus obtaining the adhesive.
Experiment: the high-strength corrugated composite board prepared in examples and comparative examples was taken for burst strength, adhesive strength, water resistance, and surface contact angle performance test. Wherein, the water resistance is that the paper is placed in water at the temperature of 25 ℃ at room temperature, the time is recorded when degumming and paper separation occur, and the water resistance of the inside of the paper board and the adhesive is reflected; the data obtained are shown in the following table:
conclusion: the data in examples 1 to 3 show that: the prepared corrugated composite paperboard has excellent burst strength of more than 2.0Mpa; the bonding strength is more than 14N/m, and the water resistance is more than 4 hours; meanwhile, the contact angle of the surface reaches 150 ℃, and the waterproof performance is excellent.
Comparing the data in comparative examples 1-2 with example 1, it is seen that the burst strength is significantly reduced when flax fabric is not embedded, rather than being treated with laccase, the burst strength is slightly reduced, and the bond strength and water resistance are reduced. The reason is that: the net-shaped flax fibers can obviously enhance the strength of the corrugated composite paperboard, and meanwhile, laccase treatment can strengthen the flax fibers and increase the hydrophobicity, so that the water resistance of the composite paperboard is improved.
Comparing the data in comparative examples 3 to 4 with example 1, it is seen that the hydrophobicity of the surface is reduced because of the synergistic effect between the polylactic acid solution and the starch solution in the waterproof layer, and when the calcium carbonate particle size is too high, the surface exhibits a reduced porous area, so that the polylactic acid particle deposition cannot be filled in the starch film structure, and proper surface roughness cannot be generated. And too high a polylactic acid concentration may produce larger particles, which may not produce optimal surface hydrophobicity.
Comparing the data of comparative examples 5 to 7 with example 1, it is clear that in comparative example 5, the viscosity was too great during the reaction due to the direct addition of soy protein and sodium hydroxide, and the grafting process was not added, resulting in a decrease in viscosity and a decrease in strength. In comparative example 6, however, since butyl acrylate was not grafted, the dispersibility thereof was lowered, so that the cohesiveness and water resistance were lowered, and at the same time, embrittlement was likely to occur during the embossing, and the burst strength was lowered due to various factors. In example 7, the tack and water resistance were reduced and the toughness was reduced due to ungrafted vinyl acetate, resulting in a reduction in burst strength.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. A processing technology of a high-strength corrugated composite paperboard is characterized in that: the method comprises the following steps:
Step 1: the flax fabric is placed in laccase-acetic acid buffer solution, immersed for 2 to 3 hours at 50 to 55 ℃, and oxygen is introduced in the reaction process; placing the mixture in an adhesive for gum dipping; covering the corrugated paper on corrugated base paper, covering a layer of corrugated base paper, and heating and embossing at 100-105 ℃ to obtain a wavy corrugated paper core;
Step 2: compounding the surface paper layer, the corrugated paper core and the inner paper layer by using an adhesive; the waterproof layer is coated on the outer surface of the surface paper layer and the inner surface of the inner paper layer, and the coating method comprises the following steps: (1) 10wt% of starch is added into deionized water, and gelatinization is carried out for 30 minutes at the temperature of 90-100 ℃; adding 50wt% of calcium carbonate, uniformly mixing, setting the temperature to 70-80 ℃, uniformly stirring, and preserving heat to obtain a solution A; (2) Dissolving polylactic acid in chloroform solution to obtain solution B with the concentration of 0.1-0.15%w/v; (3) Uniformly coating the solution A on the outer surface of the surface paper layer, and drying; spraying the solution B on the surface of the water-proof layer by means of electrospraying, and drying to obtain the water-proof layer; coating a waterproof layer on the inner surface of the inner paper layer in the same manner; obtaining a high-strength corrugated composite paperboard;
the raw materials of the adhesive comprise the following components: 50 to 60 parts of starch, 1 to 1.5 parts of sodium dodecyl benzene sulfonate, 1 to 2 parts of vinyl acetate, 2 to 4 parts of titanium dioxide compound and 0.2 to 0.5 part of ammonium persulfate by weight; the concentration of the vinyl acetate suspension is 1.0 to 1.2 weight percent of vinyl acetate aqueous solution;
The preparation method of the adhesive comprises the following steps: placing starch in hydrochloric acid solution, and stirring for 1.5-2 hours at 58-62 ℃; adding liquefied soybean protein to adjust the pH to be neutral, setting the temperature to be 82-86 ℃ and stirring for 1-2 hours; sequentially adding sodium dodecyl benzene sulfonate, titanium dioxide compound and ammonium persulfate, and uniformly mixing; adding hydrochloric acid to adjust pH=4-5, and dripping vinyl acetate suspension for 1-2 hours; setting the temperature to be 70-80 ℃ for reaction for 1-1.5 hours, cooling, and adding liquefied soy protein again to adjust the pH to be 6.2-6.5, thus obtaining the adhesive;
The preparation method of the liquefied soybean protein comprises the following steps: uniformly mixing 1.4wt% -1.6wt% of sodium sulfite, 4.5wt% -5.5wt% of urea and 1.4wt% -1.6wt% of sodium dodecyl benzene sulfonate, setting the temperature to be 72-78 ℃, adding 12wt% -14wt% of soybean protein powder, slowly adding 3wt% -3.5wt% of sodium hydroxide, and stirring for reacting for 1-2 hours to obtain liquefied soybean protein;
The preparation method of the titanium dioxide compound comprises the following steps: dispersing titanium dioxide nano particles in ethanol, adding gamma-methacryloxypropyl trimethoxy silane, and stirring for 2 hours at 50-52 ℃; adding sodium dodecyl benzene sulfonate, setting the temperature at 70-75 ℃, adding ammonium persulfate, dropwise adding butyl acrylate, and stirring for reaction for 0.5-1 hour; precipitating with sodium chloride solution, washing, and drying to obtain titanium dioxide compound;
the particle size of the calcium carbonate is 0.5-0.8 mu m.
2. The process for manufacturing high-strength corrugated composite board according to claim 1, wherein: the mass ratio of the titanium dioxide nano particles to the gamma-methacryloxypropyl trimethoxy silane is 10 (7-7.5); the addition amount of the butyl acrylate accounts for 1 to 2 weight percent of the mass of the titanium dioxide nano particles; the concentration of the sodium chloride solution is 5-8wt%.
3. The process for manufacturing high-strength corrugated composite board according to claim 1, wherein: the parameters of the electrospray are as follows: the diameter of the spray head is 1.2-1.25 mm, the voltage is 15-17 kv, and the spraying distance is 18-21 cm; the spraying speed is 0.7-0.8 mL/h; the spraying time is 20-25 minutes.
4. A high strength corrugated composite board produced by the process of any one of claims 1 to 3.
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