CN111926614A - Production method of corn starch AKD sizing agent special for papermaking - Google Patents
Production method of corn starch AKD sizing agent special for papermaking Download PDFInfo
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- CN111926614A CN111926614A CN202010814650.5A CN202010814650A CN111926614A CN 111926614 A CN111926614 A CN 111926614A CN 202010814650 A CN202010814650 A CN 202010814650A CN 111926614 A CN111926614 A CN 111926614A
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- sizing 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
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/17—Ketenes, e.g. ketene dimers
-
- 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
-
- 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
- D21H17/64—Alkaline compounds
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention provides a production method of a corn starch AKD sizing agent special for papermaking, and relates to the technical field of sizing agents for papermaking. The production method of the corn starch AKD sizing agent special for papermaking comprises the following steps: s1, preparing 20-40% starch milk, adding the starch milk into a reaction tank, adding alkali liquor to adjust the pH value of the starch milk, and adding an emulsifier to perform primary denaturation reaction; s2, adding alkali liquor into the reaction tank to adjust the pH value of the starch milk, adding 10% -50% of oxidant according to a specified amount after the starch milk is stabilized, adjusting the temperature to 20-50 ℃ for reaction, and quantitatively adding a reducing agent after the reaction is carried out for 1-8h to finish the reaction. According to the invention, corn composite modified starch is used for pasting instead of cassava oxidized starch, so that a better emulsifying and dispersing effect can be obtained in the whole reaction system, the sizing performance of the sizing agent is improved, the corn oxidized starch reacts with AKD, the lactone ring is opened and the cationization reaction is carried out, so that the hydrolysis failure of the corn oxidized starch at high temperature is avoided, and meanwhile, the aging time of the AKD emulsion can be reduced.
Description
Technical Field
The invention relates to the technical field of sizing agents for papermaking, in particular to a production method of a corn starch AKD sizing agent special for papermaking.
Background
At present, solid AKD wax powder is generally used as a sizing agent in the sizing process of the papermaking process, and is obtained by taking fatty acid with 16-18 carbon atoms as a raw material through modification reaction, but the problems of easy hydrolysis, sizing lag, easy slippage in heavy sizing and the like exist all the time.
China uses neutral sizing from the 20 th century and the 80 th century, the research on neutral sizing is rapidly developed after more than 40 years of effort, the dominant position of sizing in pulp is occupied, AKD sizing agent is most favored by enterprises and experts in numerous medium/alkaline sizing agents, AKD is alkyl ketene dimer, 1 lactone ring and 2 alkyl side chains are in the molecule, the AKD is unsaturated lactone, the melting point is waxy solid in appearance, the AKD is easy to hydrolyze to generate ketone at the temperature of more than 65.5 ℃, the AKD is stored at low temperature and is not suitable for long-term storage, and the AKD needs to be emulsified on site and then used in the application process of a paper mill, so that the application range of the AKD is limited, researchers open the lactone ring and carry out cationization reaction by utilizing cassava oxidized starch to react with the AKD in advance, so as to ensure that the lactone ring cannot lose efficacy due to hydrolysis at high temperature, and can reduce the aging time of AKD emulsion, and the glue applying lag of the paper is reduced, the effect is better, and only the price of the cassava oxidized starch is higher, so that higher cost pressure is brought to the modified AKD.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects in the prior art, the invention provides a production method of a corn starch AKD sizing agent special for papermaking, which solves the defects and shortcomings in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a production method of a corn starch AKD sizing agent special for papermaking comprises the following steps:
s1, preparing 20-40% starch milk, adding the starch milk into a reaction tank, adding alkali liquor to adjust the pH value of the starch milk to be 5.00-13.00, adding an emulsifier to perform primary denaturation reaction, adjusting the temperature to be 20-50 ℃ to perform reaction, performing the next oxidation viscosity reduction reaction after reacting for 1-8h, and controlling the viscosity to be 0.12 +/-0.02 Pa.s;
s2, continuously adding alkali liquor into the reaction tank to adjust the pH value of the starch milk to 5.00-13.00, adding 10% -50% of oxidant according to a specified amount after stabilization, adjusting the temperature to 20-50 ℃ for reaction, after reacting for 1-8h, quantitatively adding the reductant to finish the reaction, and obtaining a material after the reaction;
s3, adding a proper amount of water into the materials, washing the materials for 1-3 times, and discharging sewage after each washing;
s4, dehydrating the washed materials, discharging dehydrated sewage, and stopping dehydration when the water content in the materials is detected to be lower than 5%;
s5, conveying the dehydrated material into a drying room for drying treatment, wherein the drying temperature is 40-60 ℃, and the drying time is 2-4 h;
s6, screening the dried materials by using a cyclone screen;
and S7, selecting the screened qualified products, and packaging the finished products.
Preferably, the alkali liquor is one or more of sodium bicarbonate, sodium hydroxide, potassium hydroxide and calcium hydroxide.
Preferably, the oxidant is one or more of potassium permanganate, hydrogen peroxide, sodium hypochlorite and ammonium persulfate.
Preferably, the reducing agent is one or more of sulfurous acid, sodium sulfite and sodium metabisulfite.
Preferably, the water added in step 3 includes, but is not limited to, tap water, purified water, and ultrapure water.
(III) advantageous effects
The invention provides a production method of a corn starch AKD sizing agent special for papermaking. The method has the following beneficial effects:
1. according to the invention, corn composite modified starch is used for pasting instead of cassava oxidized starch, so that a better emulsifying and dispersing effect can be obtained in the whole reaction system, the sizing performance of the sizing agent is improved, the corn oxidized starch reacts with AKD, the lactone ring is opened and the cationization reaction is carried out, so that the hydrolysis failure of the corn oxidized starch at high temperature is avoided, and meanwhile, the aging time of the AKD emulsion can be reduced.
2. According to the invention, after the corn composite modified starch is used for substitution, the raw material is changed from cassava starch to corn starch, so that the raw material cost is reduced by about 400 yuan/ton, the field of corn deep processing is better developed, the whole preparation process of the AKD sizing agent is not required to be adjusted after the substitution, the AKD sizing agent is still used as the main emulsified raw material, and the gelatinized corn composite modified starch can be completely substituted.
3. According to the invention, the sizing agent prepared from the composite modified corn starch can achieve high stability, the layering, precipitation and the like of the sizing agent can not occur in 48 hours, the existing modified starch wet production line can meet the production of the composite modified corn starch, and the production equipment investment is small.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 1, an embodiment of the present invention provides a method for producing a corn starch AKD sizing agent special for papermaking, the method comprising the following steps:
s1, preparing 20% starch milk, adding the starch milk into a reaction tank, adding alkali liquor to adjust the pH value of the starch milk to be 5.00-13.00, adding an emulsifier to perform primary denaturation reaction, adjusting the temperature to be 20 ℃ to perform reaction, performing the next oxidation viscosity reduction reaction after reacting for 4 hours, and controlling the viscosity to be 0.12 +/-0.02 Pa.s;
in the invention, the starch is corn starch, but in practical situation, the starch can be one or more of corn starch, potato starch, waxy corn starch and pea starch;
s2, continuously adding alkali liquor into the reaction tank to adjust the pH value of the starch milk to 5.00-13.00, adding 10% -50% of oxidant according to a specified amount after stabilization, adjusting the temperature to 20 ℃ for reaction, after 4 hours of reaction, quantitatively adding a reducing agent to end the reaction, and obtaining a reacted material;
s3, adding a proper amount of water into the materials, washing the materials for 1-3 times, and discharging sewage after each washing;
s4, dehydrating the washed materials, discharging dehydrated sewage, and stopping dehydration when the water content in the materials is detected to be lower than 5%;
s5, conveying the dehydrated material into a drying room for drying treatment, wherein the drying temperature is 40 ℃, the drying time is 4 hours, hot air is introduced for drying during drying, and the drying treatment is controlled by DCS;
s6, screening the dried materials by using a cyclone screen;
and S7, selecting the screened qualified products, and packaging the finished products.
In the invention, the alkali liquor is one or more of sodium bicarbonate, sodium hydroxide, potassium hydroxide and calcium hydroxide; the oxidant is one or more of potassium permanganate, hydrogen peroxide, sodium hypochlorite and ammonium persulfate; the reducing agent is one or more of sulfurous acid, sodium sulfite and sodium pyrosulfite; the water added in step 3 includes but is not limited to tap water, purified water and ultrapure water.
Example two:
as shown in fig. 1, an embodiment of the present invention provides a method for producing a corn starch AKD sizing agent special for papermaking, the method comprising the following steps:
s1, preparing 30% starch milk, adding the starch milk into a reaction tank, adding alkali liquor to adjust the pH value of the starch milk to be 5.00-13.00, adding an emulsifier to perform primary denaturation reaction, adjusting the temperature to be 35 ℃ to perform reaction, performing the next oxidation viscosity reduction reaction after the reaction is performed for 5 hours, and controlling the viscosity to be 0.12 +/-0.02 Pa.s;
s2, continuously adding alkali liquor into the reaction tank to adjust the pH value of the starch milk to 5.00-13.00, adding 10% -50% of oxidant according to a specified amount after stabilization, adjusting the temperature to 35 ℃ for reaction, after 5 hours of reaction, quantitatively adding a reducing agent to end the reaction, and obtaining a reacted material;
s3, adding a proper amount of water into the materials, washing the materials for 1-3 times, and discharging sewage after each washing;
s4, dehydrating the washed materials, discharging dehydrated sewage, and stopping dehydration when the water content in the materials is detected to be lower than 5%;
s5, conveying the dehydrated material into a drying room for drying treatment, wherein the drying temperature is 50 ℃, and the drying time is 3 hours;
s6, screening the dried materials by using a cyclone screen;
and S7, selecting the screened qualified products, and packaging the finished products.
Example three:
as shown in fig. 1, an embodiment of the present invention provides a method for producing a corn starch AKD sizing agent special for papermaking, the method comprising the following steps:
s1, preparing starch milk with the concentration of 40%, adding the starch milk into a reaction tank, adding alkali liquor to adjust the pH value of the starch milk to be 5.00-13.00, adding an emulsifier to perform primary denaturation reaction, adjusting the temperature to be 50 ℃ to perform reaction, performing the next oxidation viscosity reduction reaction after reacting for 6 hours, and controlling the viscosity to be 0.12 +/-0.02 Pa.s;
s2, continuously adding alkali liquor into the reaction tank to adjust the pH value of the starch milk to 5.00-13.00, adding 10% -50% of oxidant according to a specified amount after stabilization, adjusting the temperature to 50 ℃ for reaction, after 6 hours of reaction, quantitatively adding a reducing agent to end the reaction, and obtaining a reacted material;
s3, adding a proper amount of water into the materials, washing the materials for 1-3 times, and discharging sewage after each washing;
s4, dehydrating the washed materials, discharging dehydrated sewage, and stopping dehydration when the water content in the materials is detected to be lower than 5%;
s5, conveying the dehydrated material into a drying room for drying treatment, wherein the drying temperature is 60 ℃, and the drying time is 2 hours;
s6, screening the dried materials by using a cyclone screen;
and S7, selecting the screened qualified products, and packaging the finished products.
According to the invention, corn composite modified starch is used for pasting instead of cassava oxidized starch, so that a better emulsifying and dispersing effect can be obtained in the whole reaction system, the sizing performance of the sizing agent is improved, the corn oxidized starch reacts with AKD, the lactone ring is opened and the cationization reaction is carried out, so that the hydrolysis failure of the corn oxidized starch at high temperature is avoided, and meanwhile, the aging time of the AKD emulsion can be reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A production method of a corn starch AKD sizing agent special for papermaking is characterized in that: the production method comprises the following steps:
s1, preparing 20-40% starch milk, adding the starch milk into a reaction tank, adding alkali liquor to adjust the pH value of the starch milk to be 5.00-13.00, adding an emulsifier to perform primary denaturation reaction, adjusting the temperature to be 20-50 ℃ to perform reaction, performing the next oxidation viscosity reduction reaction after reacting for 1-8h, and controlling the viscosity to be 0.12 +/-0.02 Pa.s;
s2, continuously adding alkali liquor into the reaction tank to adjust the pH value of the starch milk to 5.00-13.00, adding 10% -50% of oxidant according to a specified amount after stabilization, adjusting the temperature to 20-50 ℃ for reaction, after reacting for 1-8h, quantitatively adding the reductant to finish the reaction, and obtaining a material after the reaction;
s3, adding a proper amount of water into the materials, washing the materials for 1-3 times, and discharging sewage after each washing;
s4, dehydrating the washed materials, discharging dehydrated sewage, and stopping dehydration when the water content in the materials is detected to be lower than 5%;
s5, conveying the dehydrated material into a drying room for drying treatment, wherein the drying temperature is 40-60 ℃, and the drying time is 2-4 h;
s6, screening the dried materials by using a cyclone screen;
and S7, selecting the screened qualified products, and packaging the finished products.
2. The method for producing the corn starch AKD sizing agent special for papermaking as claimed in claim 1, wherein the method comprises the following steps: the alkali liquor is one or more of sodium bicarbonate, sodium hydroxide, potassium hydroxide and calcium hydroxide.
3. The method for producing the corn starch AKD sizing agent special for papermaking as claimed in claim 1, wherein the method comprises the following steps: the oxidant is one or more of potassium permanganate, hydrogen peroxide, sodium hypochlorite and ammonium persulfate.
4. The method for producing the corn starch AKD sizing agent special for papermaking as claimed in claim 1, wherein the method comprises the following steps: the reducing agent is one or more of sulfurous acid, sodium sulfite and sodium metabisulfite.
5. The method for producing the corn starch AKD sizing agent special for papermaking as claimed in claim 1, wherein the method comprises the following steps: the water added in step 3 includes but is not limited to tap water, purified water and ultrapure water.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195978A (en) * | 2008-01-04 | 2008-06-11 | 广西明阳生化科技股份有限公司 | Multicomponent modified starch for papermaking and producing method thereof |
| CN101880335A (en) * | 2010-02-03 | 2010-11-10 | 内蒙古奈伦农业科技股份有限公司 | Method for preparing modified starch by oxidation and succinic anhydride esterification |
| CN102633891A (en) * | 2012-04-19 | 2012-08-15 | 浙江益纸淀粉有限公司 | AKD (alkyl ketene dimer) starch and preparation method thereof |
| CN102635025A (en) * | 2012-05-04 | 2012-08-15 | 陕西科技大学 | Preparation method of amphiprotic corn starch AKD (Alkyl Ketene Dimer) neutral/alkaline sizing agent |
| CN104193839A (en) * | 2014-09-05 | 2014-12-10 | 广州天赐高新材料股份有限公司 | Cationic starch as well as preparation method and application of cationic starch |
-
2020
- 2020-08-14 CN CN202010814650.5A patent/CN111926614A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195978A (en) * | 2008-01-04 | 2008-06-11 | 广西明阳生化科技股份有限公司 | Multicomponent modified starch for papermaking and producing method thereof |
| CN101880335A (en) * | 2010-02-03 | 2010-11-10 | 内蒙古奈伦农业科技股份有限公司 | Method for preparing modified starch by oxidation and succinic anhydride esterification |
| CN102633891A (en) * | 2012-04-19 | 2012-08-15 | 浙江益纸淀粉有限公司 | AKD (alkyl ketene dimer) starch and preparation method thereof |
| CN102635025A (en) * | 2012-05-04 | 2012-08-15 | 陕西科技大学 | Preparation method of amphiprotic corn starch AKD (Alkyl Ketene Dimer) neutral/alkaline sizing agent |
| CN104193839A (en) * | 2014-09-05 | 2014-12-10 | 广州天赐高新材料股份有限公司 | Cationic starch as well as preparation method and application of cationic starch |
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