EP3951049B1 - High-performance environment-friendly kraft liner board, and preparation method thereof - Google Patents

High-performance environment-friendly kraft liner board, and preparation method thereof Download PDF

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Publication number
EP3951049B1
EP3951049B1 EP21166623.5A EP21166623A EP3951049B1 EP 3951049 B1 EP3951049 B1 EP 3951049B1 EP 21166623 A EP21166623 A EP 21166623A EP 3951049 B1 EP3951049 B1 EP 3951049B1
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EP
European Patent Office
Prior art keywords
pulp
styrene
water
kraft liner
liner board
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EP21166623.5A
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German (de)
English (en)
French (fr)
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EP3951049A1 (en
Inventor
Ronghua FENG
Shengyu FENG
Jiandong Chen
Xiaojun LU
Rongxia HU
Xiaomin Wu
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Zhejiang Rongsheng Environmental Protection Paper Co Ltd
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Zhejiang Rongsheng Environmental Protection Paper Co Ltd
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Classifications

    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • 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
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • 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
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/34—Ignifugeants
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • 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

Definitions

  • the present invention relates to the manufacturing and processing technical field of carton boards, in particular to a high-performance environment-friendly kraft liner board, and a preparation method thereof.
  • Carton boards are the most important raw materials for wrapping cartons. With the improvement of people's living standards and social progress, many high-grade cartons for commodity wrapping need to consume a large number of high-performance carton boards. With the continuous development of China's paper industry, the shortage of fiber raw materials has become a bottleneck issue that restricts sustainable development of the paper industry. Thus, waste paper which is widely applied in carton boards manufacturing enterprises also limits the improvement of product performance.
  • kraft liner boards for various wrapping cartons are generally made of waste paper, and without utilizing flame retardant treatment in most cases.
  • some high-grade wrapping cartons or special products such as export products, a small number of high-grade consumer products, flammable and explosive products, military products, require flame retardant wrapping and transportation in particular.
  • electric commercial cartons whether they are ordinary cartons or cartons for wrapping color TVs, refrigerators and other high-grade electrical appliances, the kraft liner boards used among them are generally without flame retardant treatment, it is a hidden danger, fires happen occasionally during transportation or storage of wrapping cartons.
  • With the development of society and the improvement of people's living requirements it is an inevitable requirement to treat kraft liner boards with flame retardants for wrapping cartons.
  • some wrapping carton products adopt the method of adding plenty of flame retardants in the pulp to get the flame retardant performance, but the added amount is large, the effect is limited, the cost is high, and the physical strength of the products is affected.
  • one of the prior arts i.e., Chinese Patent Number: CN108505372B discloses a kind of method for producing low gram weight and high strength degree craft paper using domestic waste paper.
  • another prior art i.e., Chinese Patent Number: CN109853282A discloses a kind of fire-retardant kraft liner board prepared using fire-retardant secondary stock.
  • said prior arts fail to disclose production of a paper/kraft liner board with a flame retardant layer that is effective in terms of flame retardant properties and cost, and also that does not impact the strength of the paper/ kraft liner board while adding the flame retardant properties.
  • kraft liner boards are used to wrap higher-grade products, so they have higher requirements on their quality performance, especially in the process of box making, such as stretching and folding, which requires good folding endurance, tensile strength, and ring crush compression strength. After being made into cartons, good bursting strength and water resistance are required during wrapping and transportation. In order to improve the wrapping effect, the surface requiresaji printing, so kraft liner boards also require good surface smoothing performance.
  • the prior art mainly adopts surface sizing method to improve the ring crush compression strength and surface water resistance of products, which has many defects: surface sizing can mainly improve the surface strength and partial ring crush compression resistance of the products, but have limited effect on improving the overall physical strength of the products, such as tensile strength, bursting strength and folding endurance, so the physical properties of the kraft liner boards mainly produced by waste paper are restricted. Therefore, a large number of reinforcing agents require to be added in the production process to solve the problems, and the loss is large and the cost is high. Moreover, the usage of surface sizing has a certain effect on improving the surface water resistance and lowering the Cobb value of the product, but it has limited effect on improving the overall water resistance of the kraft liner boards. Furthermore, the usage of surface sizing can improve the surface smoothness of the products to a certain extent, but it is difficult to achieve the effect of high-quality wrapping and printing products.
  • objects of the present invention are to provide a high-performance environment-friendly kraft liner board, and a preparation method thereof.
  • the invention is set out in the appended set of claims.
  • the present invention adopts technical solutions as follows.
  • a high-performance environment-friendly kraft liner board comprising a bottom layer, a top layer and a coating layer, which are arranged successively in an order from bottom to top; wherein: the bottom layer is made of a bottom layer pulp composed of a modified wood powdery pulp and a short fiber pulp; the top layer is made of a top layer pulp composed of a long fiber pulp and a short fiber pulp; the coating layer is formed through coating a flame retardant styrene-acrylic latex on the top layer; the long fiber pulp and the short fiber pulp are formed through pulping old domestic corrugated boxes; the flame retardant styrene-acrylic latex consists of modified composite flame retardants, a functional modified styrene-acrylic latex and water.
  • a basis weight of the high-performance environment-friendly kraft liner board is 100-120 g/m 2
  • a ring pressure index is 6.7-7.6 mN ⁇ m 2 /g
  • a frontal water absorption is 30-31 g/m 2
  • a limit oxygen index is 30-33%
  • a smoothness is 15-16 seconds
  • a bursting index is 2.4-2.6 kPa ⁇ m 2 /g
  • a folding endurance is 15-20 times.
  • a weight percentage concentration of the flame retardant styrene-acrylic latex is 2.0-5.0%.
  • a weight ratio of the modified composite flame retardants to the functional modified styrene-acrylic latex is 1:2.5-3.0.
  • the modified composite flame retardants are prepared through modifying composite flame retardants with a modifier; wherein: the modifier is a silane coupling agent; more preferably, the silane coupling agent is N-( ⁇ -aminoethyl)-r-aminopropyltrimethoxysilane.
  • a weight ratio of the modifier to the composite flame retardants is (0.002-0.01):1.
  • the composite flame retardants contain two or more flame retardant elements.
  • the composite flame retardants may be a combination of any two or more of ammonium polyphosphate, polyphosphoester, melamine polyphosphate, zinc borate, aluminum phosphate, aluminum hydroxide, etc., and a ratio of each flame retardant element is not specifically limited.
  • the composite flame retardants consist of two or more flame retardant elements of equal weight.
  • the zinc borate are ultra-fine powders with a particle size of 0.02-0.04 um.
  • the aluminum hydroxide are ultra-fine powders with a particle size of 0.03-0.05 um.
  • the functional modified styrene-acrylic latex is prepared through steps of:
  • a weight ratio of the dicyclopentenyl methacrylate, the water, the sodium dodecyl sulfate, the nonylphenol polyoxyethylene ether, the trimethylene carbonate, the acrylic acid, the hydroxyethyl acrylate, the butyl acrylate, the styrene, the sodium bicarbonate and the initiator is 1:40-50:0.2-0.3:0.3-0.4:1-1.3:0.2-0.5:4-6: 25-35:25-35:0.2-0.4:0.4-0.6.
  • the initiator is a persulfate salt, and specifically can be any one of ammonium persulfate, sodium persulfate or potassium persulfate.
  • a pH regulator adopts ammonia water.
  • the dicyclopentenyl methacrylate is prepared through steps of:
  • an agitator speed is 100-500 r/min.
  • a weight ratio of the methacrylic acid, the trifluoromethanesulfonic acid, the hydroquinone, the dicyclopentadiene and the NaOH is 0.8-1.2:0.002-0.004:0.00006-0.0001:1.5-2.0:0.0015-0.002.
  • a weight percentage concentration of the long fiber pulp is 3.5-4.5%
  • a weight percentage concentration of the short fiber pulp is 4-5%
  • a weight percentage concentration of the modified wood powdery pulp is 3-5%.
  • a weight ratio of the modified wood powdery pulp to the short fiber pulp is 5-10:95-90.
  • the modified wood powdery pulp is prepared through modifying wood powders with a swelling agent, and the swelling agent is a mixed alkali; a modification method is as follows: after processing the wood powders with a refiner, successively adding the mixed alkali and water, stirring evenly, then heating an obtained mixture to 70-90°C, and a swelling treatment is carried out at constant temperature for 60-90 minutes to form the modified wood powdery pulp.
  • the water used for the swelling agent modifying wood powders adopts dryer condensed water in a double-stacked paper machine, which is used for preparing products of the present invention.
  • a weight ratio of the long fiber pulp to the short fiber pulp is 80-90:20-10.
  • a weight ratio of the top layer pulp to the bottom layer pulp is 40-50:60-50.
  • a ratio of total weight of absolute dry fibers contained in the bottom layer pulp and the top layer pulp to a weight of the coating layer is 1:0.005-0.015.
  • a second object of the present invention is to provide a preparation method for the above high-performance environment-friendly kraft liner board, comprising steps of:
  • a first-stage pressure screen of the fine screening for first level three stages adopts a micro-slot width pressure screen to remove binders, and a screen slot width is 0.08-0.12 mm.
  • a weight ratio of absolute dry long fibers in the long fiber coarse pulp obtained by screen sizing to absolute dry short fibers in the short fiber coarse pulp is 30-40:70-60.
  • the long fiber pulp adopts conical refiners in series to refine the pulp, and adopts a long fiber viscous beating technology, and a beating degree is 28-30 °SR.
  • a weight percentage concentration of the long fiber pulp is 3.5-4.5%, and a weight percentage concentration of the short fiber pulp is 4-5%.
  • the water in the step (i) and step (ii) both adopts dryer condensed water in a double-stacked paper machine.
  • the retention and drainage aids in the step (2) consist of two components: cationic polyacrylamide and silica sol, wherein: a weight ratio of absolute dry fibers, cationic polyacrylamide, and silica sol is 1:0.001-0.002:0.001-0.002; the absolute dry fibers refer to total amounts of absolute dry fibers contained in the bottom layer pulp and the top layer pulp.
  • the coating in the step (2) adopts the metering roller coating technology, specifically, by a metering roller coating method, coating the flame retardant styrene-acrylic latex on the top layer of the kraft liner board obtained through double-folding, laminating, pressing and drying, so as to form a coating layer.
  • FIG.1 is a preparation process flow chart of the high-performance environment-friendly kraft liner board according to the present invention.
  • a high-performance environment-friendly kraft liner board comprising a bottom layer, a top layer and a coating layer, which are arranged successively in an order from bottom to top.
  • the bottom layer is made of a bottom layer pulp composed of a modified wood powdery pulp and a short fiber pulp.
  • the top layer is made of a top layer pulp composed of a long fiber pulp and a short fiber pulp.
  • the coating layer is formed through coating a flame retardant styrene-acrylic latex on the top layer.
  • the long fiber pulp and the short fiber pulp are formed through pulping old domestic corrugated boxes.
  • the flame retardant styrene-acrylic latex consists of modified composite flame retardants, a functional modified styrene-acrylic latex and water.
  • the composite flame retardants are a combination of any two or more of ammonium polyphosphate, polyphosphoester, melamine polyphosphate, zinc borate, and aluminum phosphate; a weight ratio of the modified composite flame retardants to the functional modified styrene-acrylic latex is 1:2.5-3.0.
  • the modified composite flame retardants are prepared through modifying composite flame retardants with a silane coupling agent.
  • the functional modified styrene-acrylic latex is prepared through steps of: adding according to a proportion, dicyclopentenyl methacrylate, water, sodium dodecyl sulfate and nonylphenol polyoxyethylene ether into a reactor 1 and stirring evenly. Then adding trimethylene carbonate, and after stirring evenly, successively adding acrylic acid, hydroxyethyl acrylate, butyl acrylate and styrene into reaction system, while stirring at a constant speed until they are mixed well. Further, the reaction system is heated to 70-90°C, and sodium bicarbonate and an initiator are added and stirred.
  • a reaction is carried out at constant temperature for 2-4 hours, and upon completion of the reaction, the mixture is cooled to a room temperature. Thereafter, filtering is done and a pH value of an obtained product is adjusted to neutral, and obtaining the functional modified styrene-acrylic latex.
  • the proportion includes a weight ratio of the dicyclopentenyl methacrylate, the water, the sodium dodecyl sulfate, the nonylphenol polyoxyethylene ether, the trimethylene carbonate, the acrylic acid, the hydroxyethyl acrylate, the butyl acrylate, the styrene, the sodium bicarbonate and the initiator is 1:40-50:0.2-0.3:0.3-0.4:1-1.3:0.2-0.5:4-6: 25-35:25-35:0.2-0.4:0.4-0.6.
  • the preparation method of a high-performance environment -friendly kraft liner board comprising following steps of:
  • the preparation method of a high-performance environment -friendly kraft liner board comprising following steps of:
  • the main performance indexes of the high-performance environment-friendly kraft liner board prepared in the examples 1 to 3 are tested.
  • the ring pressure index is tested according to an GB/T2679.8-2016 "Paperboard-Determination of ring crush compression strength”;
  • the frontal water absorption is tested according to an GB/T1540-2002 "Paper and board-Determination of water absorption”;
  • the flame retardancy is tested according to an oxygen index meter ASTM D2863 standard;
  • smoothness is tested according to an GB/T456-2002 "Paper and board-Determination of smoothness” (Bekk method);
  • bursting index is tested according to an GB/T1539-2007 "Paperboard-Determination of bursting strength”;
  • Folding endurance is tested according to an GB/T2679.5-2002 "Paper and board-Determination of folding endurance ".
  • Table 1 The main performance index test results of the high-performance environment-friendly kraft liner board prepared in Examples 1-3.
  • Technical indexes Example 1
  • Example 2 Example 3 a basis weight (g/m 2 ) 100 120 110 a ring pressure index (mN ⁇ m 2 /g) 6.7 7.6 7.2 a frontal water absorption (g/m 2 ) 30 31 30.6 flame retardancy 30 33 32.4 (a limit oxygen index %) a smoothness (seconds) 15 16 16 a bursting index (kPa ⁇ m 2 /g ) 2.4 2.6 2.55 a folding endurance (times) 15 20 20 20
EP21166623.5A 2020-06-24 2021-04-01 High-performance environment-friendly kraft liner board, and preparation method thereof Active EP3951049B1 (en)

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Application Number Priority Date Filing Date Title
CN202010587201.1A CN111809450B (zh) 2020-06-24 2020-06-24 一种高性能环保牛皮箱纸板及其制备方法

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CN114777329B (zh) * 2022-04-02 2023-07-28 山鹰国际控股股份公司 一种流浆箱外置恒温加热自动控制系统
CN115216993A (zh) * 2022-05-30 2022-10-21 浙江金泽纸品科技有限公司 一种涂布制备疏水阻燃纸的方法
CN115029959A (zh) * 2022-06-28 2022-09-09 浙江山鹰纸业有限公司 表面细微尘埃物可控的涂布牛卡原纸的制备方法
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EP3951049A1 (en) 2022-02-09
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