CN115125760A - 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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- CN115125760A CN115125760A CN202210667217.2A CN202210667217A CN115125760A CN 115125760 A CN115125760 A CN 115125760A CN 202210667217 A CN202210667217 A CN 202210667217A CN 115125760 A CN115125760 A CN 115125760A
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- 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
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- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
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- 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
- D21H19/64—Inorganic compounds
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Abstract
The invention discloses a surface sizing agent for white cardboard and a preparation method thereof, wherein the surface sizing agent comprises the following components in percentage by mass: 85-90% of sizing starch aqueous solution, 3-10% of styrene-acrylate copolymer, 2-5% of aluminum sulfate and 0.1-0.5% of polyether defoaming agent, wherein the sizing starch is cassava starch converted by amylase at 80-85 ℃, the solid content is 28-30%, and the viscosity at 60 ℃ is 80-90 mPa.s. The method selects the optimal sizing starch viscosity, improves the film forming strength and aging condition of the sizing starch, improves the permeability of the sizing solution, and improves the interlayer bonding strength and surface printing strength of the white cardboard; the film forming property of sizing is improved, the migration of a coating layer is reduced, the banner quantification is stably controlled, and the condition of unevenness in the rewinding process of paper is avoided; the number of times of replacing the metering rod in the production process is reduced, and the operability of the paper machine is improved.
Description
Technical Field
The invention relates to a papermaking surface sizing agent, in particular to a surface sizing agent for white cardboard and a preparation method thereof.
Background
In the papermaking process, the paper sheet after exiting the dryer section is different depending on the type of paper it produces, some types of paper require further surface treatment to meet higher surface performance requirements. The surface treatment of paper sheets can be generally divided into surface sizing, calendering and other processes. Surface sizing is a process in the paper sheet processing process to improve the surface properties of the paper sheet by using a chemical coating method to form a layer of glue film on the surface of the paper sheet through subsequent drying. The sizing agent for surface sizing of paper sheet mainly includes starch and its modified matter, cellulose derivative, polyvinyl alcohol, animal glue, synthetic latex, etc. Starch is a natural polymeric carbohydrate found primarily in tubers and fruits of grains, potatoes and other plants. The starch has rich resources, low price and various types, and is an important papermaking surface sizing agent and paper strengthening agent. Because the original starch has high viscosity, poor fluidity and easy coagulation, and is easy to precipitate after being diluted by water, the starch needs to be modified, so that the starch has lower viscosity at higher concentration, keeps good adhesive force and meets the requirements of paper sizing treatment. Commonly used modified starches are oxidized starches, cationic starches, enzymatically converted starches, anionic starches.
Because the speed of the white cardboard coating paper machine is high, the mechanical pulp content in paper pulp is high, and the white cardboard is manufactured by multiple layers, the viscosity of the existing enzyme-converted starch preparation is not suitable for the white cardboard, so that the surface sizing agent glue solution is not well penetrated, and the printing strength of the white cardboard can not meet the printing requirement; in addition, the existing surface sizing agent is unstable in sizing and film forming, the paper surface migration phenomenon exists in a coating section, the fluctuation of the 2sigma value of the horizontal width quantification is obvious, and finally the phenomenon of unevenness exists after paper is rolled, so that the paper cannot be used.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a surface sizing agent for improving the surface printing strength and uniformity of white cardboard and a preparation method thereof.
The technical scheme is as follows: the surface sizing agent for the white cardboard comprises the following components in percentage by mass: 85-90% of sizing starch aqueous solution, 3-10% of styrene-acrylate copolymer, 2-5% of aluminum sulfate and 0.1-0.5% of polyether defoamer, wherein the solid content of the sizing starch is 28-30%, and the viscosity at 60 ℃ is 80-90 mPa.s.
Preferably, the sizing starch is tapioca starch that is amylase-converted at 80-85 ℃.
A method for preparing a surface sizing agent for white cardboard, the method comprising:
(1) adding medium temperature alpha-amylase of 200ppm relative to 100-85 ppm of absolutely dry starch into cassava starch, introducing preheating steam of 80-85 ℃ for heating, wherein the enzyme reaction time is 16-20min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) when the temperature of the starch is 90-100 ℃, adding a stabilizer, controlling the dosage to be 0.5-1% of the oven-dried starch, and reacting for 15-20 min;
(4) at the moment, the solid content of the cassava starch is 28-30%, and the viscosity at 60 ℃ is 80-90 mPa.s;
(5) after dilution, the solid content of the cassava starch is 10-16%, and the viscosity is 15-25mPa.s at 45 ℃;
(6) adding 3-10% of styrene-acrylate copolymer;
(7) adding 2-5% of aluminum sulfate, wherein the PH value of the glue application liquid is 3.0-4.5;
(8) adding 3-5% of polyether defoaming agent, and uniformly stirring to obtain the surface sizing agent.
Preferably, the tapioca starch in the step (1) is filtered through a 40-50 mesh sieve.
Preferably, the stabilizer in the step (3) is any one of glycerin, urea, and a polypropylene glycol-glycerol-itaconic acid polycondensate.
Preferably, in the step (5), the cassava starch before dilution is filtered by a 60-70 mesh filter screen.
Preferably, in the step (8), the defoaming agent is added into the sizing liquid through a circular pipeline
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: 1. the surface sizing agent prepared by the invention selects the optimal sizing starch viscosity, improves the film forming strength and aging condition of the sizing starch, improves the permeability of the sizing solution, and improves the interlayer bonding strength and surface printing strength of the ivory board; 2. the surface sizing agent prepared by the invention improves the film forming property of sizing, reduces the migration of a coating layer, stably controls the banner ration, and avoids the condition of unevenness in the rewinding process of paper; 3. the invention reduces the replacement times of the metering rod in the production process and improves the operability of the paper machine.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 90.9% of sizing starch aqueous solution, 5.5% of styrene-acrylate copolymer, 3.3% of aluminum sulfate and 0.3% of polyether defoaming agent, wherein the sizing starch is cassava starch converted by amylase at the temperature of 80-85 ℃, the solid content is 29%, and the viscosity at the temperature of 60 ℃ is 85 mPa.s.
Preparation method of surface sizing agent for white cardboard of example 1:
(1) adding 120ppm of medium-temperature alpha-amylase relative to oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 20min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) adding stabilizer (PCA-1952) of polycondensation product of polypropylene glycol, glycerol and itaconic acid at starch temperature of 90-100 deg.C, wherein the amount is controlled to be 1% of oven dry starch, and the reaction time is 15-20 min;
(4) the solid content of the cassava starch is 29%, and the viscosity at 60 ℃ is 85 mPa.s;
(5) after dilution, the solid content of the cassava starch is 14%, and the viscosity is 23mPa.s at 45 ℃;
(6) adding styrene-acrylate surface sizing agent (Soxhlet, basoplast TM PX7311 XAP, CAS number 25586-20-3), with the amount of 5.5%;
(7) 3.3 percent of aluminum sulfate is added, and the PH value of the sizing liquid is 3.8;
(8) adding 0.3% polyether DEFOAMER (DEFOAMER 3137) and stirring uniformly to obtain the surface sizing agent.
Example 2
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 88.1 percent of sizing starch aqueous solution, 7.0 percent of styrene-acrylate copolymer, 4.4 percent of aluminum sulfate and 0.5 percent of polyether defoamer, wherein the sizing starch is cassava starch converted by amylase at the temperature of 80-85 ℃, the solid content is 28 percent, and the viscosity at the temperature of 60 ℃ is 80 mPa.s.
The preparation method of the surface sizing agent of the white cardboard of the embodiment 2 comprises the following steps:
(1) adding 150ppm of medium-temperature alpha-amylase relative to oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 17min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) adding stabilizer (PCA-1952) of polycondensation product of polypropylene glycol, glycerol and itaconic acid at starch temperature of 90-100 deg.C, wherein the amount is controlled to 0.5% of oven dry starch, and the reaction time is 15-20 min;
(4) the solid content of the cassava starch is 28%, and the viscosity at 60 ℃ is 79 mPa.s;
(5) after dilution, the solid content of the cassava starch is 12%, and the viscosity is 24mPa.s at 45 ℃;
(6) adding styrene-acrylate surface sizing agent (Soxhlet, basoplast TM PX7311 XAP, CAS number 25586-20-3), with the amount of 7.0%;
(7) 4.4 percent of aluminum sulfate is added, and the PH value of the sizing liquid is 3.2;
(8) 0.5% of a polyether DEFOAMER (DEFAOAMER 3137, Guangdong Liangshi) was added thereto and stirred uniformly to obtain a surface sizing agent.
Example 3
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 93.9% of sizing starch aqueous solution, 4.0% of styrene-acrylate copolymer, 2.0% of aluminum sulfate and 0.1% of polyether defoaming agent, wherein the sizing starch is cassava starch converted by amylase at the temperature of 80-85 ℃, the solid content is 30%, and the viscosity at the temperature of 60 ℃ is 90 mPa.s.
The preparation method of the surface sizing agent of the white cardboard of the embodiment 3 comprises the following steps:
(1) adding 200ppm of medium-temperature alpha-amylase relative to oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 16min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) adding stabilizer (PCA-1952) of polycondensation product of polypropylene glycol, glycerol and itaconic acid at starch temperature of 90-100 deg.C, wherein the amount is controlled to be 1% of oven dry starch, and the reaction time is 15-20 min;
(4) the solid content of the cassava starch is 30%, and the viscosity at 60 ℃ is 90 mPa.s;
(5) after dilution, the solid content of the cassava starch is 16%, and the viscosity is 22mPa.s at 45 ℃;
(6) adding styrene-acrylate copolymer with the dosage of 4.0%;
(7) 2.0 percent of aluminum sulfate is added, and the PH value of the sizing liquid is 4.0;
(8) adding 0.1% polyether DEFOAMER (DEFOAMER 3137) and stirring uniformly to obtain the surface sizing agent.
Comparative example 1
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 100% sizing starch aqueous solution, wherein the sizing starch is cassava starch converted by amylase at 80-85 deg.C, has a solid content of 29%, and has a viscosity of 83mPa.s at 60 deg.C
The preparation method of the surface sizing agent for the white cardboard of the comparative example 1 comprises the following steps:
(1) adding 160ppm of medium-temperature alpha-amylase relative to oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 18min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) the solid content of the cassava starch is 29%, and the viscosity at 60 ℃ is 83 mPa.s;
(4) after dilution, the solid content of the cassava starch is 16%, and the viscosity is 25mPa.s at 45 ℃, so that the surface sizing agent is obtained.
Comparative example 2
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 100% of sizing starch aqueous solution, wherein the sizing starch is tapioca starch converted by amylase at 80-85 deg.C, has solid content of 29%, and has viscosity of 85mPa.s at 60 deg.C
The preparation method of the surface sizing agent for the white cardboard of the comparative example 2 comprises the following steps:
(1) adding 200ppm of medium-temperature alpha-amylase relative to oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 18min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) adding stabilizer (PCA-1952) of polycondensation product of polypropylene glycol, glycerol and itaconic acid at starch temperature of 90-100 deg.C, wherein the amount is controlled to be 1% of oven dry starch, and the reaction time is 15-20 min;
(4) at the moment, the solid content of the cassava starch is 29 percent, and the viscosity at 60 ℃ is 85 mPa.s;
(5) after dilution, the solid content of the cassava starch is 10%, and the viscosity is 21mPa.s at 45 ℃, so that the surface sizing agent is obtained.
Comparative example 3
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 94.3 percent of sizing starch aqueous solution and 5.7 percent of styrene-acrylate copolymer, wherein the sizing starch is cassava starch converted by amylase at the temperature of 80-85 ℃, the solid content is 29 percent, and the viscosity at the temperature of 60 ℃ is 85 mPa.s.
The preparation method of the surface sizing agent for the white cardboard of the comparative example 3 comprises the following steps:
(1) adding 170ppm of medium-temperature alpha-amylase relative to absolutely dry starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 17, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) adding stabilizer (PCA-1952) of polycondensation product of polypropylene glycol, glycerol and itaconic acid at starch temperature of 90-100 deg.C, wherein the amount is controlled to be 1% of oven dry starch, and the reaction time is 15-20 min;
(4) at the moment, the solid content of the cassava starch is 29 percent, and the viscosity at 60 ℃ is 85 mPa.s;
(5) after dilution, the solid content of the cassava starch is 13%, and the viscosity is 24mPa.s at 45 ℃;
(6) adding styrene-acrylate copolymer with the dosage of 5.7%, and uniformly stirring to obtain the surface sizing agent.
Comparative example 4
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 91.2 percent of sizing starch aqueous solution, 5.5 percent of styrene-acrylate copolymer and 3.3 percent of aluminum sulfate, wherein the sizing starch is cassava starch converted by amylase at the temperature of 80-85 ℃, the solid content is 29 percent, and the viscosity at the temperature of 60 ℃ is 85 mPa.s.
Preparation method of surface sizing agent for white cardboard of comparative example 4:
(1) adding 130ppm of medium-temperature alpha-amylase relative to oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 19min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) adding stabilizer (PCA-1952) of polycondensation product of polypropylene glycol, glycerol and itaconic acid at starch temperature of 90-100 deg.C, wherein the amount is controlled to be 1% of oven dry starch, and the reaction time is 15-20 min;
(4) the solid content of the cassava starch is 29%, and the viscosity at 60 ℃ is 85 mPa.s;
(5) after dilution, the solid content of the cassava starch is 14%, and the viscosity is 23mPa.s at 45 ℃;
(6) adding styrene-acrylate copolymer in 5.5%;
(7) adding 3.3% of aluminum sulfate, uniformly stirring the glue application liquid with the pH value of 4.1/3.4 to obtain the surface sizing starch.
Comparative example 5
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 90.9% of sizing starch aqueous solution, 5.5% of styrene-acrylate copolymer, 3.3% of aluminum sulfate and 0.3% of polyether defoamer, wherein the sizing starch is cassava starch converted by amylase at the temperature of 80-85 ℃, the solid content is 29%, and the viscosity at the temperature of 60 ℃ is 45 mPa.s.
The preparation method of the surface sizing agent for the white cardboard of the comparative example 5 comprises the following steps:
(1) adding 120ppm of medium-temperature alpha-amylase relative to oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 20min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) adding stabilizer (PCA-1952) of polycondensation product of polypropylene glycol, glycerol and itaconic acid at starch temperature of 90-100 deg.C, wherein the amount is controlled to 1% of absolutely dry starch, and the reaction time is 15-20 min;
(4) the solid content of the cassava starch is 29%, and the viscosity at 60 ℃ is 45 mPa.s;
(5) after dilution, adding styrene-acrylate copolymer with the dosage of 5.5 percent;
(6) adding 3.3% of aluminum sulfate, wherein the PH value of the glue application liquid is 4.2/3.1;
(7) and adding 0.3% of polyether defoaming agent, and uniformly stirring to obtain the surface sizing agent.
Comparative example 6
A surface sizing agent for white cardboard comprises the following components in percentage by mass: 90.9% of sizing starch aqueous solution, 5.5% of styrene-acrylate copolymer, 3.3% of aluminum sulfate and 0.3% of polyether defoaming agent, wherein the sizing starch is cassava starch converted by amylase at the temperature of 80-85 ℃, the solid content is 29%, and the viscosity at the temperature of 60 ℃ is 165 mPa.s.
The preparation method of the surface sizing agent for the white cardboard of the comparative example 6:
(1) adding 120ppm of medium-temperature alpha-amylase relative to oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 20min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) adding stabilizer (PCA-1952) of polycondensation product of polypropylene glycol, glycerol and itaconic acid at starch temperature of 90-100 deg.C, wherein the amount is controlled to be 1% of oven dry starch, and the reaction time is 15-20 min;
(4) the solid content of the molten tapioca starch is 29%, and the viscosity at 60 ℃ is 165 mPa.s;
(5) after dilution, adding styrene-acrylate copolymer with the dosage of 5.5 percent;
(6) adding 3.3% of aluminum sulfate, wherein the PH value of the glue application liquid is 4.1/3.2;
(7) and adding 0.3% of polyether defoaming agent, and uniformly stirring to obtain the surface sizing agent.
The index parameters of examples 1 to 3 and comparative examples 1 to 6 are shown in Table 1.
TABLE 1
The experimental results show that the standard detection viscosity of starch at 60 ℃ in examples 1-3 is 80-90mpa.s, the detection of the viscosity of the starch is carried out by taking the reduction of 5 ℃ as a gradient, the larger the numerical value difference is, the faster the starch aging rate is, the smaller the numerical value is, the slower the molecular chain aging of the starch is, and the higher the stability is, the starch aging rate is too high in comparative example 1 which is only prepared by converting starch by using a simple enzyme, and the starch aging rate is accelerated in comparative example 6 which is prepared by excessively high viscosity of the starch.
The front and back surfaces of the surface picking strength IGT test values of examples 1-3 are all 4.00m/s, the front surface simulation printing times TV16 can reach 4 times, the back surface simulation printing times TV16 can reach 3 times, and the comparative example 4 can reach the same strength, but because no defoaming agent is used, more foams are generated in actual production, printing white spots appear on the paper surface, and in severe cases, missing coating is caused in the feeding process.
The interlayer bonding strength of the paper after the glue is applied in the examples 1-3 and the interlayer bonding strength of the paper off-line machine reach 160J/square meter, the numerical value difference is small, the coating migration of the coating section is small, the water vapor in the paper is balanced, the hydrogen bond bonding strength between fibers is not excessively damaged, and the I-K reagent dyeing permeability detection of the section of the paper also shows that the thickness of the dyeing part in the examples 1-3 is large mainly because the permeability is improved by the aluminum sulfate in the sizing solution, and the permeability of the sizing solution is influenced by the overlarge viscosity of the sizing solution in the comparative example 6.
The COBB value of the paper sheets in examples 1 to 3 and the COBB value after 72 hours of complete curing can meet the index requirements, the off-machine value is similar to the curing value, the paper stability is high, and the COBB value in comparative examples 1 to 3 cannot meet the paper quality index.
The 2sigma of the scanner frame cross webs after sizing in examples 1-3 is smaller than that of the scanner frame cross webs after coating, which shows the stability of the sizing glue solution, and the comparative example 5 shows that the viscosity of the sizing glue solution is too low, the barrier property of the glue solution to the subsequent coating is poor although the permeability of the glue solution is higher, the molecular chain of the sizing glue solution is too short, the strength is poor, and the surface IGT strength is reduced.
The sizing solution of comparative example 1 was only enzymatically converted starch, and was inferior to all of the indexes of examples 1-3.
The sizing solution of comparative example 2 was lower in polyether defoamer, aluminum sulfate and styrene-acrylic sizing agent than examples 1-3, and was inferior to examples 1-3 in all of the indicators except for the starch aging rate.
The sizing liquid of comparative example 3 has less polyether defoamer and aluminum sulfate than those of examples 1 to 3, low interlayer bonding strength of paper, slightly poor printing IGT strength and TV16 strength, poor water absorption COBB value, large foam generation amount, and poor sizing coating 2sigma stability.
The size of comparative example 4 had less polyether defoamer than examples 1-3, very high foam generation and poor size coat 2sigma stability.
The sizing starch solution of comparative example 5 produced a lower viscosity than examples 1-3, had a lower surface IGT strength, poor banner 2 σ stability, and a large loss in interlaminar bond strength after sizing.
The sizing starch solution of comparative example 6 produced a viscosity higher than that of examples 1-3, low TV16 strength, low degree of sizing penetration, and low post-sized interlaminar bond strength.
Claims (7)
1. A surface sizing agent for white cardboard is characterized by comprising the following components in percentage by mass: 85-90% of sizing starch aqueous solution, 3-10% of styrene-acrylate copolymer, 2-5% of aluminum sulfate and 0.1-0.5% of polyether defoaming agent, wherein the solid content of the sizing starch is 28-30%, and the viscosity at 60 ℃ is 80-90 mPa.s.
2. A surface sizing agent for ivory board according to claim 1, characterised in that the sizing starch is tapioca starch converted by amylase at 80-85 ℃.
3. A method of preparing a surface sizing agent for white cardboard according to claim 1, characterized in that the method comprises:
(1) adding medium-temperature alpha-amylase which is 200ppm relative to 100-200ppm of oven-dried starch into cassava starch, introducing preheating steam at 80-85 ℃ for heating, wherein the enzyme reaction time is 16-20min, and the enzyme reaction temperature is 80-85 ℃;
(2) high-temperature cooking and enzyme inactivation of the second-stage starch, wherein the inactivation time is 4-6min, and the inactivation temperature is controlled at 130-135 ℃;
(3) when the temperature of the starch is 90-100 ℃, adding a stabilizer, controlling the using amount to be 0.5-1% of the absolutely dry starch, and controlling the reaction time to be 15-20 min;
(4) at the moment, the solid content of the cassava starch is 28-30%, and the viscosity at 60 ℃ is 80-90 mPa.s;
(5) after dilution, the solid content of the cassava starch is 10-16%, and the viscosity is 20-25mPa.s at 45 ℃;
(6) adding 3-10% of styrene-acrylate copolymer;
(7) adding 2-5% of aluminum sulfate, wherein the PH value of the glue application liquid is 3.0-4.5;
(8) and adding 3-5% of polyether defoamer, and uniformly stirring to obtain the surface sizing agent.
4. The method of preparing a surface sizing agent for white cardboard according to claim 3, wherein the tapioca starch is filtered through a 40-50 mesh sieve in the step (1).
5. The method of preparing a surface sizing agent for white cardboard according to claim 3, wherein the stabilizer in the step (3) is any one of glycerin, urea, polypropylene glycol-glycerin-itaconic acid polycondensate.
6. The method of preparing a surface sizing agent for white cardboard according to claim 3, wherein in the step (5), the tapioca starch before dilution is filtered through a 60-70 mesh sieve.
7. The method of preparing a surface sizing agent for white cardboard according to claim 3, wherein in the step (8), a defoaming agent is added to the sizing solution through an endless pipe.
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| CN202210667217.2A CN115125760B (en) | 2022-06-14 | 2022-06-14 | Surface sizing agent for white cardboard and preparation method thereof |
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| CN202210667217.2A CN115125760B (en) | 2022-06-14 | 2022-06-14 | Surface sizing agent for white cardboard and preparation method thereof |
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| CN115125760B CN115125760B (en) | 2023-08-15 |
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| CN115125760B (en) | 2023-08-15 |
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