CN117026670A - Production method of high-strength corrugated paper with high water resistance and moisture regain resistance - Google Patents
Production method of high-strength corrugated paper with high water resistance and moisture regain resistance Download PDFInfo
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- CN117026670A CN117026670A CN202311227618.7A CN202311227618A CN117026670A CN 117026670 A CN117026670 A CN 117026670A CN 202311227618 A CN202311227618 A CN 202311227618A CN 117026670 A CN117026670 A CN 117026670A
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- corrugated paper
- resistance
- moisture regain
- paper
- water resistance
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000004513 sizing Methods 0.000 claims abstract description 44
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 24
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003292 glue Substances 0.000 claims abstract description 20
- 239000000839 emulsion Substances 0.000 claims abstract description 15
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 13
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 13
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000008117 stearic acid Substances 0.000 claims abstract description 13
- 229920002261 Corn starch Polymers 0.000 claims abstract description 12
- 239000008120 corn starch Substances 0.000 claims abstract description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 11
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 11
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 11
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 10
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 9
- 229920000881 Modified starch Polymers 0.000 claims abstract description 8
- 239000004368 Modified starch Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000002791 soaking Methods 0.000 claims abstract description 7
- 229920002472 Starch Polymers 0.000 claims description 24
- 235000019698 starch Nutrition 0.000 claims description 24
- 239000008107 starch Substances 0.000 claims description 24
- 238000010790 dilution Methods 0.000 claims description 12
- 239000012895 dilution Substances 0.000 claims description 12
- 230000032050 esterification Effects 0.000 claims description 11
- 238000005886 esterification reaction Methods 0.000 claims description 11
- 238000004132 cross linking Methods 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000007865 diluting Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 240000003183 Manihot esculenta Species 0.000 description 2
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 239000001254 oxidized starch Substances 0.000 description 2
- 235000013808 oxidized starch Nutrition 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000014102 seafood Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
-
- 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
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- 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
- D21H21/12—Defoamers
-
- 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
- D21H21/16—Sizing or water-repelling agents
-
- 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
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated 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
- D21H27/40—Multi-ply at least one of the sheets being non-planar, e.g. crêped
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention discloses a production method of high-strength corrugated paper with high water resistance and moisture regain resistance, which comprises the steps of adding clear water into a glue decocting pot, then starting a stirrer to stir, adding sodium hydroxide, adding corn starch to stir, adding stearic acid, starting a steam valve to heat, adding polyvinyl alcohol and ammonium persulfate, starting the steam valve again to heat, adding sodium hydroxide again, adding hot water to dilute and placing into a diluting tank to prepare esterified oxidized double-modified starch glue, preparing sizing agent from water, aluminum sulfate, a surface sizing agent, AKD emulsion and a defoaming agent, soaking and sizing corrugated paper by the sizing agent through a sizing machine, and drying after sizing. The method for producing the high-strength corrugated paper with high water resistance and moisture regain resistance can ensure that the water resistance and moisture regain resistance of the corrugated paper can be effectively improved, can effectively ensure the use strength of the manufactured corrugated paper box, is beneficial to prolonging the service life, ensures that the original tension and stiffness of paper are maintained under the wet environment of the paper box to prevent the paper box from collapsing, and meets various use requirements.
Description
Technical Field
The invention relates to the technical field of corrugated paper production, in particular to a high-strength corrugated paper production method with high water resistance and moisture regain resistance.
Background
The corrugated paper is a platy object formed by bonding the liner paper and corrugated paper with wave shape formed by processing by a corrugated roller, and has the advantages of low cost, light weight, easy processing, high strength, good printing adaptability, convenient storage and transportation and the like, more than 80 percent of the corrugated paper can be recycled, and the corrugated paper can be used as the package of food or digital products, is relatively environment-friendly and is widely used;
with the rapid development and increasing maturity of society and science and technology, higher requirements are put forward on paper performance, but the traditional paper performance can not meet the use requirements, if the water resistance and moisture regain resistance are relatively good, especially in the southern plum rainy season, the paper boxes are damped and the original tension and stiffness of the paper are difficult to keep to prevent the produced paper boxes from collapsing, meanwhile, with the increasing cases that various seafood, vegetables and fruits use the paper boxes for cold storage packaging and transportation, the paper boxes are difficult to ensure effective use in a humid environment;
in view of the above, the present invention has been developed to solve the above problems, and a method for producing a high-strength corrugated paper with high water resistance and moisture regain resistance is provided to solve the above problems and meet the requirements.
Disclosure of Invention
The invention aims to provide a method for producing high-strength corrugated paper with high water resistance and moisture regain resistance, which aims to solve the problem that the conventional corrugated paper production industry is difficult to ensure the high water resistance and moisture regain resistance of paper in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method for producing high-strength corrugated paper with high water resistance and moisture regain resistance comprises the following steps:
step (1): adding clear water into the glue decocting pot, and then starting a stirrer to stir;
step (2): adding sodium hydroxide to regulate the pH value while stirring;
step (3): adding corn starch, stirring, and preparing into uniform starch emulsion;
step (4): adding stearic acid, and starting a steam valve to heat;
step (5): sequentially adding polyvinyl alcohol and ammonium persulfate to carry out esterification crosslinking reaction;
step (6): starting the steam valve again to heat up for oxidation reaction;
step (7): adding sodium hydroxide again to adjust the PH value;
step (8): starting a hot water pump, adding hot water for dilution, and placing the mixture into a dilution tank to prepare the esterified oxidized double-modified starch adhesive;
step (9): adding water, aluminum sulfate, a surface sizing agent, AKD emulsion and a defoaming agent into starch glue to prepare a sizing agent;
step (10): soaking and sizing the corrugated paper by a sizing agent through a sizing machine;
step (11): and drying the glued corrugated paper.
As a preferable technical scheme of the invention, the clear water is added into the step (1) to be 7-8 m 3 The stirring speed was controlled to 28 to 32rpm.
As a preferable technical scheme of the invention, the adding amount of the corn starch in the step (3) is 1000-1200 kg, and the stirring time is 1-2 min.
As a preferable technical scheme of the invention, the adding amount of the stearic acid in the step (4) is 7.5-8.5 kg, and the temperature is controlled at 46-52 ℃ after the temperature is raised.
As a preferable embodiment of the present invention, the amount of polyvinyl alcohol added in the step (5) is 12 to 13 kg, the amount of ammonium persulfate added is 8 to 9 kg, and the esterification and crosslinking reaction time is controlled to 15 to 20 minutes.
As a preferable technical scheme of the invention, the temperature is raised to 90-92 ℃ in the step (6), and then the temperature is kept for 15-20 min.
As a preferable technical scheme of the invention, the temperature of the added hot water in the step (8) is 92-95 ℃.
As a preferable technical scheme of the invention, the added water content in the step (9) is 600-800 kg, the aluminum sulfate content is 10-15 kg, the surface sizing agent content is 0.5-1 kg, the AKD emulsion water content is 12-17 kg, and the defoaming agent content is 0.1-0.2 kg.
As a preferable technical scheme of the invention, in the step (10), the dryness of the paper sheets of the corrugated paper fed into the sizing machine is controlled to be 92-94%, and the temperature of the paper sheets of the corrugated paper is controlled to be 80-85 ℃.
Compared with the prior art, the invention has the beneficial effects that: the method for producing the high-strength corrugated paper with high water resistance and moisture regain resistance can ensure that the water resistance and moisture regain resistance of the corrugated paper can be effectively improved, can effectively ensure the use strength of the manufactured corrugated paper box, is beneficial to prolonging the service life, ensures that the original tension and stiffness of paper are maintained in the wet environment of the paper box to prevent the paper box from collapsing, and meets various use requirements;
1. the modified starch glue has good fluidity inherent to oxidized starch and good film forming property and viscosity stability of esterified starch, and can form a layer of compact film on the surface of corrugated paper after being used as a surface sizing agent for sizing corrugated paper, thereby preventing water vapor in air from penetrating into paper fibers to achieve the aim of moisture regain resistance.
2. After the corn starch is modified by esterification, the thermal viscosity stability of the starch glue can reach the same degree of the tapioca starch glue, so that the corn starch is used for replacing tapioca starch for surface sizing of corrugated paper, and the production cost is reduced;
3. in the preparation process of the starch glue, a small amount of polyvinyl alcohol is added and decocted together with starch, so that the film forming property of the starch glue is improved, the aim of moisture regain resistance is fulfilled, double insurance is formed by esterification with stearic acid, and the aim of high moisture regain resistance is fulfilled;
4. the AKD latex and aluminum sulfate are added to further improve the water resistance of the corrugated paper, so that the effect of high water resistance is achieved.
Drawings
FIG. 1 is a graph showing the comparison of ring crush strength of corrugated paper according to the present invention;
fig. 2 is a comparative graph of moisture regain resistance of corrugated paper according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described 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
Referring to fig. 1-2, the technical scheme of the present invention is as follows: a method for producing high-strength corrugated paper with high water resistance and moisture regain resistance comprises the following steps:
step (1): adding 7m into the glue decocting pot 3 Clear water is stirred by starting a stirrer, and the stirring speed is controlled to be 30rpm;
step (2): adding sodium hydroxide to regulate the pH value while stirring;
step (3): adding 1500 kg of corn starch, stirring for 1min, and preparing into uniform starch emulsion;
step (4): 7.5 kg of stearic acid is added, a steam valve is opened to heat, and the temperature is controlled at 46 ℃;
step (5): sequentially adding 12 kg of polyvinyl alcohol and 8 kg of ammonium persulfate for esterification and crosslinking reaction, and controlling the reaction time to be 15min;
step (6): starting the steam valve again to heat up for oxidation reaction, controlling the temperature to be 90 ℃, and preserving the heat for 15min;
step (7): adding sodium hydroxide again to adjust the PH value;
step (8): starting a hot water pump, adding 92 ℃ hot water for dilution, and discharging to a dilution tank to prepare the esterified oxidized double-modified starch adhesive;
step (9): 600 kg of water, 10 kg of aluminum sulfate, 1.0 kg of surface sizing agent, 12 kg of AKD emulsion and 0.12 kg of defoaming agent are added into starch glue to prepare sizing agent;
step (10): soaking and sizing the corrugated paper with 92% of paper dryness and 80 ℃ of temperature by using a sizing agent through a sizing machine;
step (11): and drying the glued corrugated paper.
Example two
Referring to fig. 1-2, the technical scheme of the present invention is as follows: a method for producing high-strength corrugated paper with high water resistance and moisture regain resistance comprises the following steps:
step (1): adding 8m into the glue decocting pot 3 Clear water is stirred by starting a stirrer, and the stirring speed is controlled to be 30rpm;
step (2): adding sodium hydroxide to regulate the pH value while stirring;
step (3): adding 1100 kg of corn starch, stirring for 1.5min, and preparing into uniform starch emulsion;
step (4): 7.8 kg of stearic acid is added, a steam valve is opened to heat, and the temperature is controlled at 48 ℃;
step (5): 12.3 kg of polyvinyl alcohol and 8 kg of ammonium persulfate are sequentially added for esterification and crosslinking reaction, and the reaction time is controlled to be 17min;
step (6): starting the steam valve again to heat up for oxidation reaction, controlling the temperature to be 9 ℃, and preserving the heat for 16min;
step (7): adding sodium hydroxide again to adjust the PH value;
step (8): starting a hot water pump, adding 93 ℃ hot water for dilution, and discharging to a dilution tank to prepare the esterified oxidized double-modified starch adhesive;
step (9): 650 kg of water, 12 kg of aluminum sulfate, 0.8 kg of surface sizing agent, 14 kg of AKD emulsion and 0.15 kg of defoaming agent are added into starch glue to prepare sizing agent;
step (10): soaking and sizing the corrugated paper with the dryness of the paper being 93% and the temperature being 82 ℃ by a sizing agent through a sizing machine;
step (11): and drying the glued corrugated paper.
Example III
Referring to fig. 1-2, the technical scheme of the present invention is as follows: a method for producing high-strength corrugated paper with high water resistance and moisture regain resistance comprises the following steps:
step (1): adding 8m into the glue decocting pot 3 Clear water is stirred by starting a stirrer, and the stirring speed is controlled to be 30rpm;
step (2): adding sodium hydroxide to regulate the pH value while stirring;
step (3): adding 1100 kg of corn starch, stirring for 1.5min, and preparing into uniform starch emulsion;
step (4): adding 8 kg of stearic acid, starting a steam valve to heat, and controlling the temperature at 50 ℃;
step (5): 12.5 kg of polyvinyl alcohol and 8.5 kg of ammonium persulfate are sequentially added for esterification and crosslinking reaction, and the reaction time is controlled to be 18min;
step (6): starting the steam valve again to heat up for oxidation reaction, controlling the temperature to be 92 ℃ and preserving the heat for 18min;
step (7): adding sodium hydroxide again to adjust the PH value;
step (8): starting a hot water pump, adding hot water at 95 ℃ for dilution, and discharging to a dilution tank to prepare the esterified oxidized double-modified starch adhesive;
step (9): to the starch glue, 750 kg of water, 13 kg of aluminum sulfate, 0.7 kg of surface sizing agent, 16 kg of AKD emulsion and 0.18 kg of defoaming agent are added to prepare sizing agent;
step (10): soaking and sizing the corrugated paper with the dryness of the paper being 93% and the temperature being 56 ℃ by a sizing agent through a sizing machine;
step (11): and drying the glued corrugated paper.
Example IV
Referring to fig. 1-2, the technical scheme of the present invention is as follows: a method for producing high-strength corrugated paper with high water resistance and moisture regain resistance comprises the following steps:
step (1): adding 8m into the glue decocting pot 3 Clear water is stirred by starting a stirrer, and the stirring speed is controlled to be 30rpm;
step (2): adding sodium hydroxide to regulate the pH value while stirring;
step (3): adding 1200 kg of corn starch, stirring for 2min, and preparing into uniform starch emulsion;
step (4): adding 8 kg of stearic acid, starting a steam valve to heat, and controlling the temperature at 50 ℃;
step (5): 12.5 kg of polyvinyl alcohol and 9 kg of ammonium persulfate are sequentially added for esterification and crosslinking reaction, and the reaction time is controlled to be 20min;
step (6): starting the steam valve again to heat up for oxidation reaction, controlling the temperature to be 92 ℃ and preserving heat for 20min;
step (7): adding sodium hydroxide again to adjust the PH value;
step (8): starting a hot water pump, adding hot water at 95 ℃ for dilution, and discharging to a dilution tank to prepare the esterified oxidized double-modified starch adhesive;
step (9): adding 800 kg of water, 15 kg of aluminum sulfate, 0.5 kg of surface sizing agent, 15 kg of AKD emulsion and 0.018 kg of defoaming agent into starch glue to prepare sizing agent;
step (10): soaking and sizing the corrugated paper with the dryness of the paper being 94% and the temperature being 85 ℃ by a sizing agent through a sizing machine;
step (11): and drying the glued corrugated paper.
1-2, in the test of the embodiment, the ring pressure strength of the corrugated paper products of the embodiments 1-4 is gradually improved, the consumption of the surface sizing agent is reduced, and the moisture regain resistance of the products is improved;
the ammonium persulfate and the stearic acid are respectively used as the oxidant and the esterifying agent, so that the corn starch is oxidized and esterified and double-denatured, the modified esterified and oxidized double-denatured starch gum has good fluidity inherent to oxidized starch and good film forming property and viscosity stability of esterified starch, and therefore, after the modified esterified and double-denatured starch gum is used on corrugated paper, a layer of compact film can be formed on the surface of the corrugated paper, so that the water vapor is isolated from penetrating into the paper, the moisture regaining resistant effect is realized, and meanwhile, the stearic acid is a hydrophobic group functional group and can prevent cold water from penetrating into the paper, so that the water resistance of the corrugated paper can be improved;
simultaneously, the polyvinyl alcohol and the starch are decocted at the same time, so that the film forming property of the starch glue can be improved to achieve the effect of moisture regain resistance, double insurance is formed by esterification with stearic acid, and the effect of high moisture regain resistance is further realized;
the AKD latex and aluminum sulfate are added to further improve the water resistance of the corrugated paper;
in summary, the corrugated paper production method provided by the technology can effectively ensure that the produced corrugated paper has high water resistance and moisture regain resistance, meets the use requirement in a humid environment, improves the service life, and belongs to the prior art which is not described in detail in the specification and is known to the expert in the field.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The production method of the high-strength corrugated paper with high water resistance and moisture regain resistance is characterized by comprising the following steps of:
step (1): adding clear water into the glue decocting pot, and then starting a stirrer to stir;
step (2): adding sodium hydroxide to regulate the pH value while stirring;
step (3): adding corn starch, stirring, and preparing into uniform starch emulsion;
step (4): adding stearic acid, and starting a steam valve to heat;
step (5): sequentially adding polyvinyl alcohol and ammonium persulfate to carry out esterification crosslinking reaction;
step (6): starting the steam valve again to heat up for oxidation reaction;
step (7): adding sodium hydroxide again to adjust the PH value;
step (8): starting a hot water pump, adding hot water for dilution, and placing the mixture into a dilution tank to prepare the esterified oxidized double-modified starch adhesive;
step (9): adding water, aluminum sulfate, a surface sizing agent, AKD emulsion and a defoaming agent into starch glue to prepare a sizing agent;
step (10): soaking and sizing the corrugated paper by a sizing agent through a sizing machine;
step (11): and drying the glued corrugated paper.
2. The method for producing high-strength corrugated paper with high water resistance and moisture regain resistance according to claim 1, wherein the clear water added in the step (1) is 7-8 m 3 The stirring speed was controlled to 28 to 32rpm.
3. The method for producing high-strength corrugated paper with high water resistance and moisture regain resistance according to claim 1, wherein the corn starch adding amount in the step (3) is 1000-1200 kg, and the stirring time is 1-2 min.
4. The method for producing high-strength corrugated paper with high water resistance and moisture regain resistance according to claim 1, wherein the adding amount of stearic acid in the step (4) is 7.5-8.5 kg, and the temperature is controlled to be 46-52 ℃ after heating.
5. The method for producing high-strength corrugated paper with high water resistance and moisture regain resistance according to claim 1, wherein the adding amount of polyvinyl alcohol in the step (5) is 12-13 kg, the adding amount of ammonium persulfate is 8-9 kg, and the esterification and crosslinking reaction time is controlled to be 15-20 min.
6. The method for producing high-strength corrugated paper with high water resistance and moisture regain resistance according to claim 1, wherein the temperature is raised to 90-92 ℃ in the step (6), and then the heat is preserved for 15-20 min.
7. The method for producing high-strength corrugated paper with high water resistance and moisture regain resistance according to claim 1, wherein the temperature of the hot water added in the step (8) is 92-95 ℃.
8. The method for producing the high-strength corrugated paper with high water resistance and moisture regain resistance according to claim 1, wherein the added water content in the step (9) is 600-800 kg, the aluminum sulfate content is 10-15 kg, the surface sizing agent content is 0.5-1 kg, the AKD emulsion water content is 12-17 kg, and the defoaming agent content is 0.1-0.2 kg.
9. The method for producing high-strength corrugated paper with high water resistance and moisture regain resistance according to claim 1, wherein in the step (10), the dryness of the paper sheets of the corrugated paper fed into the sizing machine is controlled to be 92-94%, and the temperature of the paper sheets of the corrugated paper is controlled to be 80-85 ℃.
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