CN116005482B - Surface sizing agent for white cardboard and preparation method thereof - Google Patents
Surface sizing agent for white cardboard and preparation method thereof Download PDFInfo
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- CN116005482B CN116005482B CN202211700580.6A CN202211700580A CN116005482B CN 116005482 B CN116005482 B CN 116005482B CN 202211700580 A CN202211700580 A CN 202211700580A CN 116005482 B CN116005482 B CN 116005482B
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- 238000004513 sizing Methods 0.000 title claims abstract description 208
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title abstract description 4
- 229920002472 Starch Polymers 0.000 claims abstract description 153
- 235000019698 starch Nutrition 0.000 claims abstract description 153
- 239000008107 starch Substances 0.000 claims abstract description 153
- 239000007864 aqueous solution Substances 0.000 claims abstract description 79
- 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 50
- NJVOHKFLBKQLIZ-UHFFFAOYSA-N (2-ethenylphenyl) prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1C=C NJVOHKFLBKQLIZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims description 35
- 239000000243 solution Substances 0.000 claims description 34
- 240000003183 Manihot esculenta Species 0.000 claims description 33
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 33
- 239000000123 paper Substances 0.000 claims description 33
- 239000004382 Amylase Substances 0.000 claims description 29
- 102000013142 Amylases Human genes 0.000 claims description 29
- 108010065511 Amylases Proteins 0.000 claims description 29
- 235000019418 amylase Nutrition 0.000 claims description 29
- 238000006243 chemical reaction Methods 0.000 claims description 29
- 240000008042 Zea mays Species 0.000 claims description 20
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 20
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 20
- 235000005822 corn Nutrition 0.000 claims description 20
- 239000013530 defoamer Substances 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 229920002261 Corn starch Polymers 0.000 claims description 12
- 239000008120 corn starch Substances 0.000 claims description 12
- 239000006185 dispersion Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 8
- 102000004190 Enzymes Human genes 0.000 claims description 6
- 108090000790 Enzymes Proteins 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 230000000415 inactivating effect Effects 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 150000002191 fatty alcohols Chemical class 0.000 claims description 2
- 239000002480 mineral oil Substances 0.000 claims description 2
- 235000010446 mineral oil Nutrition 0.000 claims description 2
- 238000010979 pH adjustment Methods 0.000 claims description 2
- HXHCOXPZCUFAJI-UHFFFAOYSA-N prop-2-enoic acid;styrene Chemical compound OC(=O)C=C.C=CC1=CC=CC=C1 HXHCOXPZCUFAJI-UHFFFAOYSA-N 0.000 claims 2
- 239000000463 material Substances 0.000 claims 1
- 238000005086 pumping Methods 0.000 claims 1
- 239000011436 cob Substances 0.000 abstract description 9
- 230000000087 stabilizing effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000000413 hydrolysate Substances 0.000 abstract description 2
- 230000002255 enzymatic effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 239000003292 glue Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 229940088598 enzyme Drugs 0.000 description 4
- 230000002779 inactivation Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- -1 aluminum ions Chemical class 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 3
- 238000006911 enzymatic reaction Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 102000004139 alpha-Amylases Human genes 0.000 description 2
- 108090000637 alpha-Amylases Proteins 0.000 description 2
- 229940024171 alpha-amylase Drugs 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 238000006116 polymerization reaction Methods 0.000 description 2
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- 239000002994 raw material Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
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- 108010009736 Protein Hydrolysates Proteins 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001592 potato starch Polymers 0.000 description 1
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- 239000002352 surface water Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
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- Paper (AREA)
Abstract
The application discloses a surface sizing agent for white cardboard and a preparation method thereof, and relates to the technical field of papermaking. The application comprises a sizing starch aqueous solution, styrene acrylate polymer, aluminum sulfate and a defoaming agent, wherein the mass of the styrene acrylate polymer is 0-15% of the absolute dry mass of the sizing starch aqueous solution, the content of the styrene acrylate polymer is not 0, the mass of the aluminum sulfate is 1-2% of the absolute dry mass of the sizing starch aqueous solution, the mass of the defoaming agent is 0.03-0.05% of the absolute dry mass of the sizing starch aqueous solution, the solid content of the sizing starch aqueous solution is 29-31%, and the viscosity at 60 ℃ is 50-60 mPa.s. The method forms a beneficial hydrolysate through aluminum sulfate, and then builds a stabilizing system together with SAE (styrene acrylate polymer) and sizing starch, so that the viscosity of the surface sizing agent is stable, the sizing film forming property of the surface sizing agent is improved, and the stability of the Cobb value of the white cardboard is improved.
Description
Technical Field
The application relates to the technical field of papermaking, in particular to a surface sizing agent for white cardboard and a preparation method thereof.
Background
At present, various exquisite patterns are printed on the front surface of the white cardboard in the market. And the surface sizing agent on the white cardboard is unstable in sizing film forming, and affects the Cobb value (Cobb value, surface water absorption value) of the white cardboard.
Disclosure of Invention
An embodiment of the application provides a surface sizing agent for white cardboard, which comprises a sizing starch aqueous solution, a styrene acrylate polymer, aluminum sulfate and a defoaming agent, wherein the mass of the styrene acrylate polymer is 0-15% of the absolute dry mass of the sizing starch aqueous solution, the content of the styrene acrylate polymer is not 0, the mass of the aluminum sulfate is 1-2% of the absolute dry mass of the sizing starch aqueous solution, the mass of the defoaming agent is 0.03-0.05% of the absolute dry mass of the sizing starch aqueous solution, the solid content of the sizing starch aqueous solution is 29-31%, and the viscosity at 60 ℃ is 50-60 mPa.s.
An embodiment of the present application provides a method for preparing a surface sizing agent for white cardboard, including:
diluting the sizing starch aqueous solution, wherein before dilution, the solid content of the sizing starch aqueous solution is 29-31%, and the viscosity at 60 ℃ is 50-60 mPa.s;
adding styrene acrylate polymer into the diluted sizing starch aqueous solution, wherein the mass of the styrene acrylate polymer is 0-15% of the absolute dry mass of the sizing starch aqueous solution, and the content of the styrene acrylate polymer is not 0;
adding aluminum sulfate into the diluted sizing starch aqueous solution, and uniformly stirring, wherein the mass of the aluminum sulfate is 1-2% of the absolute dry mass of the sizing starch aqueous solution;
adjusting the pH value of the diluted sizing starch aqueous solution;
adding an antifoaming agent, and uniformly stirring to obtain the surface sizing agent, wherein the mass of the antifoaming agent is 0.03-0.05% of the absolute dry mass of the sizing starch aqueous solution.
The method forms a beneficial hydrolysate through aluminum sulfate, and then builds a stabilizing system together with SAE (styrene acrylate polymer) and sizing starch, so that the viscosity of the surface sizing agent is stable, the sizing film forming property of the surface sizing agent is improved, and the stability of the Cobb value of the white cardboard is improved.
Detailed Description
The present application is described in further detail below in conjunction with examples. It is specifically noted that the following examples are only for illustration of the present application, but do not limit the scope of the present application. Likewise, the following embodiments are only some, but not all, of the embodiments of the present application, and all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Next, a surface sizing agent is described which can be used for the white cardboard, in particular, for coating at least one side surface of the base paper of the white cardboard to form a precoating layer. The surface sizing agent can improve the sizing film forming property of the surface sizing agent on the white cardboard, thereby improving the stability of the Cobb value of the white cardboard.
Surface sizing agents may include aqueous sizing starch solutions, styrene acrylate polymers, and aluminum sulfate. The aluminum sulfate can form a beneficial hydrolysate, and then can co-construct a stabilizing system with SAE (styrene acrylate polymer) and sizing starch, so that the viscosity of the surface sizing agent is stable, the sizing film forming property of the surface sizing agent is improved, and the stability of the Cobb value of the white cardboard is improved.
In some embodiments, the aqueous sizing starch solution has a solids content of 29-31% and a viscosity of 50-60 mPa.s at 60 ℃. In some embodiments, the sizing starch content in the aqueous sizing starch solution is other than 0 and comprises, in parts by mass, 0-90 parts of tapioca sizing starch and 0-90 parts of corn sizing starch. In some embodiments, the amounts of both tapioca sizing starch and corn sizing starch may be adjusted based on the raw material of the base paper of the white cardboard.
In some embodiments, the sizing starch aqueous solution may be prepared by: and (3) carrying out amylase conversion on tapioca starch to obtain tapioca sizing starch, carrying out amylase conversion on corn starch to obtain corn sizing starch, and uniformly mixing the tapioca sizing starch and the corn sizing starch.
In some embodiments, the process of making tapioca starch for amylase conversion to tapioca sized starch may be: and heating the tapioca starch water dispersion slurry mixed with amylase to an amylase conversion temperature by using a first heater, transferring the tapioca starch water dispersion slurry into a first enzyme conversion container for amylase conversion, converting the tapioca starch water dispersion slurry into an aqueous tapioca sizing starch solution, and heating and inactivating the aqueous tapioca sizing starch solution by using a second heater. In some embodiments, the first heater may be a front-section digester. In some embodiments, the first enzymatic conversion vessel may be an enzymatic reaction tank. In some embodiments, the second heater may be a back-end digester. In some embodiments, the first heater may be in communication with the first enzymatic conversion vessel, the second heater, and in turn, the conduit. Wherein a pump can be used as a power source to transfer the liquid. In some embodiments, the tapioca starch aqueous dispersion slurry may be screened through a 60 mesh screen, and the undersize mixed with amylase to increase the enzymatic conversion rate. In some embodiments, the mass of amylase may be 150-200ppm of the absolute dry weight of the tapioca starch water-dispersed slurry. In some embodiments, the amylase may be a mesophilic amylase such as an alpha-amylase. In some embodiments, the first heater may be used to rapidly heat to an enzymatic conversion temperature, such as 85 ℃, with saturated steam at high pressure, such as 650 kPa. In some embodiments, the transfer to the first enzymatic conversion vessel may be performed for a period of time ranging from 20 to 22 minutes, and steam is introduced to maintain the enzymatic conversion temperature, e.g., 80 to 83 ℃. In some embodiments, the temperature of the heat inactivation treatment of the aqueous tapioca starch solution with the second heater may be up to 130 ℃, and the inactivation time may be between 6 and 8 minutes. In some embodiments, the aqueous tapioca sizing starch solution has a solids content of 29-31% and a viscosity of 50-60 mPa-s at 60 ℃.
In some embodiments, the process of making corn potato starch for amylase conversion to corn sizing starch may be: and heating the corn starch water dispersion slurry mixed with amylase to amylase conversion temperature by using a third heater, transferring to a second enzyme conversion container for amylase conversion, converting into corn sizing starch aqueous solution, and heating and inactivating the corn sizing starch aqueous solution by using a fourth heater. In some embodiments, the third heater may be a front-section digester. In some embodiments, the second enzymatic conversion vessel may be an enzymatic reaction tank. In some embodiments, the fourth heater may be a back-end digester. In some embodiments, the third heater may be in communication with the second enzymatic conversion vessel, the fourth heater in turn, and the conduit. Wherein a pump can be used as a power source to transfer the liquid. In some embodiments, the aqueous corn starch slurry may be screened through a 60 mesh screen, and the undersize mixed with amylase to increase the rate of enzymatic conversion. In some embodiments, the mass of amylase may be 300-350ppm of the absolute dry weight of the corn starch water-dispersed slurry. In some embodiments, the amylase may be a mesophilic amylase such as an alpha-amylase. In some embodiments, a third heater may be used to rapidly heat to an enzymatic conversion temperature, such as 85-90 ℃, with saturated steam at a high pressure, such as 650 kPa. In some embodiments, the transfer to the second enzymatic conversion vessel may be performed for a period of time ranging from 20 to 22 minutes, and steam is introduced to maintain the enzymatic conversion temperature, e.g., 80 to 83 ℃. In some embodiments, the temperature of the heat inactivation treatment of the aqueous corn sizing starch solution with the fourth heater may be up to 130 ℃, and the inactivation time may be between 6 and 8 minutes. In some embodiments, the aqueous corn sizing starch solution has a solids content of 29-31% and a viscosity of 50-60 mPa.s at 60 ℃.
In some embodiments, the first heater and the third heater may be the same front-section digester. In some embodiments, the second heater and the fourth heater may be the same back-end digester. In some embodiments, the first and second enzyme conversion vessels may be the same enzyme reaction tank.
It will be appreciated that the aqueous sizing starch solution breaks down the starch macromolecules by amylase and the viscosity of the aqueous sizing starch solution is made appropriate by controlling the amount of enzyme, reaction time, temperature.
In some embodiments, the specific process of uniformly mixing tapioca sizing starch and corn sizing starch may be: the aqueous tapioca starch solution and the aqueous corn starch solution may be mixed in a skim stock vessel. In some embodiments, the surface glue storage container may be connected to the second heater and/or the fourth heater by a pipe, respectively, and a pump may be used as a power source to transfer the liquid, thereby transferring the liquid in the second heater and/or the fourth heater to the surface glue storage container, respectively.
In some embodiments, the aqueous sizing starch solution may be diluted for subsequent processing, such as mixing with styrene acrylate polymer, aluminum sulfate, defoamer, etc., for example, for direct transfer to a paper machine storage vessel. In some embodiments, the undersize product after passing the aqueous solution of sizing starch through a 60-80 mesh screen may be water diluted. In some embodiments, the diluted aqueous sizing starch solution has a solids content of 12-14% and a viscosity of 10-15 mPa-s at 60 ℃; in some embodiments, the diluted aqueous sizing starch solution has a solids content of 20-22% and a viscosity of 25-30 mPa.s at 60 ℃. In some embodiments, the solids content of the diluted aqueous sizing starch solution and the viscosity at 60 ℃ may also be adjusted according to the raw materials of the base paper of the white cardboard and the requirements of the white cardboard. In some embodiments, the aqueous sizing starch solution may be diluted in a size storage vessel. In some embodiments, the glue reservoir may be piped to the machine reservoir and a pump may be used as a power source to transfer the liquid and thus the liquid from the glue reservoir to the machine reservoir. The machine storage container may be a container on the machine that stores the surface sizing agent.
In some embodiments, the styrene acrylate polymer has a mass of 0-15% of the absolute dry mass of the aqueous solution of sizing starch and the styrene acrylate polymer is not present in an amount of 0. The emulsifier of SAE in the polymerization synthesis process can synthesize the organic surfactant with dominant effect. The initiator in the SAE polymerization synthesis process is decomposed with the surfactant to remain, so that the initiator is difficult to remove, the quality of the surface sizing agent generated by SAE is affected, a stabilizing system is built together with SAE and starch by the surface sizing agent under the cooperation of aluminum sulfate, the influence of the initiator and the surfactant on the surface sizing agent is reduced, the viscosity of the surface sizing agent is stabilized, and the sizing film forming property of the surface sizing agent is improved.
In some embodiments, the styrene acrylate polymer has a mass of 0-9% of the absolute dry mass of the aqueous solution of sizing starch and the styrene acrylate polymer is not present in an amount of 0. In some embodiments, the mass of the styrene acrylate polymer is 9% of the oven dry mass of the aqueous solution of sizing starch.
In some embodiments, the styrene acrylate polymer may be transferred to the machine storage vessel at the same time as the diluted aqueous solution of sizing starch is transferred to the machine storage vessel. For example, the styrene acrylate polymer is fed into the pipe connecting the sealer storage vessel and the papermachine storage vessel through the pipe connecting the sealer storage vessel and the papermachine storage vessel, and the diluted aqueous sizing starch solution is transferred to the papermachine storage vessel where the styrene acrylate polymer and the aqueous sizing starch solution are mixed.
In some embodiments, the mass of aluminum sulfate is 1-2% of the oven dry mass of the aqueous solution of sizing starch.
In some examples, the surface sizing agent was subjected to aluminum sulfate addition comparison experiments, the experimental data being as follows:
it can be seen that when the addition amounts of the sizing starch aqueous solution, the SAE and the defoamer are fixed, the viscosity of the surface sizing agent is reduced after the mass of aluminum sulfate is 1% of the absolute dry mass of the sizing starch aqueous solution, and the continuous addition of aluminum sulfate is smooth.
The surface sizing agent is subjected to ageing comparison experiments, and experimental data are specifically as follows:
it can be seen that when the addition amounts of the sizing starch aqueous solution, the SAE and the defoamer are fixed, the stability of the surface sizing agent after adding aluminum sulfate is better than that of the surface sizing agent without adding aluminum sulfate, and the stability of the surface sizing agent after adding aluminum sulfate is stable.
After the mass of aluminum sulfate is 1% of the absolute dry mass of the sizing starch aqueous solution, the viscosity of the surface sizing agent is reduced, and the continuous addition of aluminum sulfate is smooth.
Surface sizing agent coated base paper (base paper gram weight 200 g/m) 2 ) Generating intoPhysical properties of the paper were tested, and experimental data were as follows:
it can be seen that when the addition amounts of the sizing starch aqueous solution, the SAE and the defoamer are fixed, the Cobb value of the finished paper is reduced after the mass of aluminum sulfate is 1% of the absolute dry mass of the sizing starch aqueous solution, and the paper becomes stable after aluminum sulfate is continuously added. The paper Pick up strength also tended to stabilize after reaching a high point after adding 2% aluminum sulfate.
In the experiment, after aluminum sulfate is added, the viscosity stability of the starch glue solution is improved, the SAE sizing effect is improved, and the preferable aluminum sulfate addition amount is 1% -2% of the absolute dry mass of the sizing starch aqueous solution.
In some embodiments, aluminum sulfate may be transferred to the machine storage vessel along with the diluted aqueous sizing starch solution as it is transferred to the machine storage vessel. For example, aluminum sulfate is fed into the pipe connecting the size storage vessel and the machine storage vessel through the pipe connecting the size storage vessel and the machine storage vessel, and then the diluted aqueous solution of sizing starch is transferred to the machine storage vessel where the aqueous solution of sizing starch and aluminum sulfate are mixed. Furthermore, the adding amount of aluminum sulfate can be controlled in a linkage manner according to the flow rate of the sizing starch aqueous solution in a pipeline, so that the probability that the adding amount cannot be adjusted when metering is not performed is reduced.
In some embodiments, the diluted aqueous sizing starch solution in the sizing storage vessel is pumped into the machine storage vessel while the styrene acrylate polymer and aluminum sulfate are added to the pipe conveying the aqueous sizing starch solution to be pumped into the machine storage vessel with the aqueous sizing starch solution.
In some embodiments, the aluminum sulfate hydrolysis reaction chemistry may be as follows:
Al 2 (SO4) 3 +6H2O□2Al(OH) 3 +3H 2 SO 4
wherein Al (OH) 3 In water there are different forms of aluminiumThe overall effect of the compound, typically four aluminum compounds, on aluminum sulfate is greater:
(1) soluble aluminum ions: al (Al) +3 At pH 3.8-4.2, mainly Al is used +3 In the form of (C) when the pH is 4.8-5.0, al +3 The content of (2) decreases to 0. Soluble aluminum ions may act as complexation.
(2) Soluble aluminium polymer Al 8 (OH) 20 +4 The presence of the most reactive aluminum polymer at a pH of 4.5 to 5.0, the high charge density cations being adsorbed on the fiber surface, may act as retention aids.
(3) Insoluble aluminum hydroxide: al (OH) 3 The main component exists at pH 5-9, and the hydrolysis product of aluminum sulfate is adsorbed on the surface, so that the particles have trace cations, and the cation charge increases with the increase of pH from 4.8 and decreases with the increase of pH 9.0.
(4) Soluble aluminum hydroxide ions: al (OH) 4 -1 When the pH is more than 10, the water-soluble polymer is a main component and does not have a retention-aid effect.
It can be seen that at pH 4.5-5.0, the soluble aluminum polymer Al 8 (OH) 20 +4 The overall effect of the aluminum sulfate is best, and the retention effect of the aluminum sulfate is reflected. Further, the effect of aluminum sulfate is optimal when the pH of the surface sizing agent, such as an aqueous sizing starch solution, is 4.5 to 5.0. In some embodiments, the pH of the surface sizing agent, such as an aqueous solution of sizing starch, may be in the range of 4.7 to 4.9. In some embodiments, the pH of the surface sizing agent, such as an aqueous solution of sizing starch, may be adjusted by a pH adjuster, and further, the surface sizing agent may also include a pH adjuster. In some embodiments, the ph adjuster may be sodium hydroxide.
In some embodiments, the diluted aqueous sizing starch solution may be pH adjusted after addition of the styrene acrylate polymer and aluminum sulfate, and in some embodiments, the diluted aqueous sizing starch solution is pH adjusted in a paper machine storage vessel. In some embodiments, the pH adjustment may form a surface sizing agent that causes the sizing machine to size the base paper with the surface sizing agent in the machine storage vessel.
In some embodiments, the surface sizing agent may also include an antifoaming agent to provide foam control in subsequent processes. In some embodiments, the defoamer is 0.03-0.05% by mass of the oven dry mass of the aqueous sizing starch solution. Of course, the amount of defoamer may also be adjusted based on the amount of aqueous corn starch solution. In some embodiments, the defoamer includes a water-soluble mineral oil defoamer and/or a fatty alcohol defoamer, which reduces the probability of foam flooding into the trench causing environmental problems.
In some embodiments, the surface sizing agent may be prepared by adding the styrene acrylate polymer and aluminum sulfate to the aqueous sizing starch solution followed by adding the defoamer and stirring the mixture uniformly. In some embodiments, after adding the styrene acrylate polymer and aluminum sulfate to the aqueous solution of sizing starch, and adjusting the pH, adding an antifoaming agent, and stirring to even the surface sizing agent. In some embodiments, after adding styrene acrylate polymer and aluminum sulfate to the paper machine storage container or adjusting the pH value in the paper machine storage container, adding an antifoaming agent into a size press return pipe of the paper machine, flowing into the paper machine storage container, and uniformly stirring to form a surface sizing agent, so that the size press of the paper machine uses the surface sizing agent in the paper machine storage container to size the base paper.
In some embodiments, the amount of surface sizing agent applied to the surface of the base paper may be: the front surface of the base paper is 6g/m 2 The back surface of the base paper is 2g/m 2 . Of course, the glue coating amount of the surface sizing agent on the surface of the base paper can be adjusted according to the gram weight of the white cardboard, the paper strength, cobb control and other requirements.
Next, a method for preparing a surface sizing agent, which can be used for preparing the surface sizing agent in the above examples, will be described. The method may include:
step S1: the aqueous solution of sizing starch is diluted.
Step S2: styrene acrylate polymer is added into the diluted sizing starch aqueous solution.
Step S3: adding aluminum sulfate into the diluted sizing starch aqueous solution, and uniformly stirring.
Step S4: and (3) adjusting the pH value of the diluted sizing starch aqueous solution.
Step S5: adding an antifoaming agent, and uniformly stirring to obtain the surface sizing agent.
The surface sizing agent prepared by the method can promote the sizing film forming property on the white cardboard, thereby improving the stability of the Cobb value of the white cardboard.
The method can also be used for real-time production on a base paper sizing site, any one of additives such as styrene acrylate polymer, aluminum sulfate and the like can be monitored in real time in the production process, real-time adjustment is carried out, and sudden use environment, such as temporary interference brought by other components of a surface sizing glue solution and the like, can be shielded in time, so that the surface glue effect of the surface sizing agent is caused.
The foregoing is only examples of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the contents of the present application or direct or indirect application in other related technical fields are included in the scope of the patent protection of the present application.
Claims (12)
1. The surface sizing agent for the white cardboard is characterized by comprising a sizing starch aqueous solution, a styrene acrylic acid ester polymer, aluminum sulfate, a pH value regulator and an antifoaming agent, wherein the mass of the styrene acrylic acid ester polymer is 9-15% of the absolute dry mass of the sizing starch aqueous solution, the mass of the aluminum sulfate is 1-2% of the absolute dry mass of the sizing starch aqueous solution, the mass of the antifoaming agent is 0.03-0.05% of the absolute dry mass of the sizing starch aqueous solution, the solid content of the sizing starch aqueous solution is 29-31%, the viscosity at 60 ℃ is 50-60 mPa.s, and the pH value of the surface sizing agent is 4.5-5.0.
2. The surface sizing agent according to claim 1, wherein the sizing starch content in the sizing starch aqueous solution is not 0 and comprises, in parts by mass, 0-90 parts of tapioca sizing starch and 0-90 parts of corn sizing starch.
3. The surface sizing agent according to claim 1, wherein the pH of the surface sizing agent is 4.7 to 4.9.
4. The surface sizing agent according to claim 1, characterized in that the defoamer comprises a water-soluble mineral oil defoamer and/or a fatty alcohol defoamer.
5. A method for preparing a surface sizing agent for white cardboard, comprising:
diluting the sizing starch aqueous solution, wherein before dilution, the solid content of the sizing starch aqueous solution is 29-31%, and the viscosity at 60 ℃ is 50-60 mPa.s;
adding styrene acrylate polymer into the diluted sizing starch aqueous solution, wherein the mass of the styrene acrylate polymer is 9-15% of the absolute dry mass of the sizing starch aqueous solution;
adding aluminum sulfate into the diluted sizing starch aqueous solution, and uniformly stirring, wherein the mass of the aluminum sulfate is 1-2% of the absolute dry mass of the sizing starch aqueous solution;
adjusting the pH value of the diluted sizing starch aqueous solution to 4.5-5.0;
adding an antifoaming agent, and uniformly stirring to obtain the surface sizing agent, wherein the mass of the antifoaming agent is 0.03-0.05% of the absolute dry mass of the sizing starch aqueous solution.
6. The method of claim 5, further comprising, prior to said diluting the aqueous sizing starch solution:
converting tapioca starch into tapioca starch by amylase, and converting corn starch into corn starch by amylase;
and mixing 0-90 parts of tapioca sizing starch and 0-90 parts of corn sizing starch by mass to form the sizing starch aqueous solution, wherein the sizing starch content in the sizing starch aqueous solution is not 0.
7. The method of claim 6, wherein the amylase converting tapioca starch to tapioca sized starch and amylase converting corn starch to corn sized starch comprises:
heating the tapioca starch water dispersion slurry mixed with amylase to amylase conversion temperature by using a first heater, transferring the tapioca starch water dispersion slurry into a first enzyme conversion container for amylase conversion, converting the tapioca starch water dispersion slurry into an aqueous solution of tapioca sizing starch, and heating and inactivating the aqueous solution of tapioca sizing starch by using a second heater;
and heating the corn starch water dispersion slurry mixed with amylase to an amylase conversion temperature by using a third heater, transferring the corn starch water dispersion slurry into a second enzyme conversion container for amylase conversion, converting the corn starch water dispersion slurry into an aqueous solution of corn sizing starch, and heating and inactivating the aqueous solution of the corn sizing starch by using a fourth heater.
8. The method of claim 7, wherein said mixing, in parts by mass, 0-90 parts of said tapioca sizing starch and 0-90 parts of said corn sizing starch into said aqueous sizing starch solution comprises:
mixing the aqueous solution of the tapioca sizing starch and the aqueous solution of the corn sizing starch in a surface sizing storage container, wherein the tapioca sizing starch in the aqueous solution of the tapioca sizing starch is 0-90 parts by mass, and the corn sizing starch in the aqueous solution of the corn sizing starch is 0-90 parts by mass.
9. The method of claim 8, wherein said step of adding styrene acrylate polymer to said diluted aqueous solution of said sizing starch and said step of adding aluminum sulfate to said diluted aqueous solution of said sizing starch, and stirring uniformly comprises:
and pumping the diluted sizing starch aqueous solution in the surface sizing storage container into a paper machine storage container, and simultaneously adding the styrene acrylate polymer and the aluminum sulfate into a pipeline for conveying the sizing starch aqueous solution so as to pump the styrene acrylate polymer and the aluminum sulfate into the paper machine storage container together with the sizing starch aqueous solution.
10. The method of claim 9, wherein said pH adjustment of said diluted aqueous solution of sizing starch comprises:
and (3) adjusting the pH value of the diluted sizing starch aqueous solution in the paper machine storage container.
11. The method of claim 10, wherein adding the defoamer and agitating uniformly to the surface size comprises:
and adding the defoaming agent into a return pipe of a sizing machine of the paper machine, flowing into a storage container of the paper machine, and uniformly stirring to form the surface sizing agent, so that the sizing machine of the paper machine uses the surface sizing agent in the storage container of the paper machine to size base paper.
12. The method of claim 5, wherein diluting the aqueous solution of sizing starch comprises:
diluting the undersize material obtained after the sizing starch aqueous solution is screened by a 60-80-mesh sieve with water;
wherein the solid content of the diluted sizing starch aqueous solution is 12-14%, and the viscosity at 60 ℃ is 10-15 mPa.s;
or the solid content of the diluted sizing starch aqueous solution is 20-22%, and the viscosity at 60 ℃ is 25-30 mPa.s.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1321574A1 (en) * | 2001-12-18 | 2003-06-25 | Chemische Fabrik Brühl Mare GmbH | Surface sizing agent |
| CN103835184A (en) * | 2014-02-28 | 2014-06-04 | 玖龙纸业（太仓）有限公司 | Sizing agent for paper |
| CN115125760A (en) * | 2022-06-14 | 2022-09-30 | 江苏博汇纸业有限公司 | Surface sizing agent for white cardboard and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1321574A1 (en) * | 2001-12-18 | 2003-06-25 | Chemische Fabrik Brühl Mare GmbH | Surface sizing agent |
| CN103835184A (en) * | 2014-02-28 | 2014-06-04 | 玖龙纸业（太仓）有限公司 | Sizing agent for paper |
| CN115125760A (en) * | 2022-06-14 | 2022-09-30 | 江苏博汇纸业有限公司 | Surface sizing agent for white cardboard and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 硫酸铝添加对瓦楞纸表面施胶的影响规律及机理探讨;吕文志等;包装工程;第41卷(第05期);第143-147页 * |
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