CN112724308B - Dispersant, grinding dispersant and coating for papermaking coating - Google Patents
Dispersant, grinding dispersant and coating for papermaking coating Download PDFInfo
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- CN112724308B CN112724308B CN202011637404.3A CN202011637404A CN112724308B CN 112724308 B CN112724308 B CN 112724308B CN 202011637404 A CN202011637404 A CN 202011637404A CN 112724308 B CN112724308 B CN 112724308B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/08—Dispersing agents for fibres
Abstract
The invention discloses a dispersant, a grinding dispersant and a coating for papermaking coating. The grinding dispersant is prepared by the following steps: slowly dripping functional mixed monomer into the base material, regulating the temperature to 80-95 ℃, initiating copolymerization by adopting an oxidation and reduction system, dripping for reaction for 180-300min, keeping the temperature for reaction for 30-120min, cooling to below 30-40 ℃ after keeping the temperature for reaction, and regulating the pH value to 4.0-7.0 by using liquid alkali to obtain the catalyst. The grinding dispersant can form a more stable double-electronic-layer structure around the ground calcium carbonate particles; meanwhile, the grinding dispersant polymer can form a spatial three-dimensional network structure around the slurry calcium particles in the grinding process of calcium carbonate, can further improve the stability of the ground calcium carbonate, improve the particle size of the slurry calcium and increase the solid content of the slurry calcium while reducing viscosity, thereby reducing energy consumption, greatly improving the indexes of the glossiness, smoothness and the like of finished paper, and having the advantages of less consumption of the grinding dispersant, good effect and low cost.
Description
Technical Field
The invention relates to the technical field of high molecular dispersants, and particularly relates to a dispersant, a grinding dispersant and a coating for papermaking coating.
Background
Calcium carbonate is used in papermaking coatings because of its high whiteness, low cost, good ink absorption, and the like, especially natural Ground Calcium Carbonate (GCC) is in great demand in papermaking coatings. Nowadays, the papermaking industry is developing towards scale and high speed, the papermaking coating is developing towards higher solid content, and the solid content of part of the papermaking coating is more than 72%, so that the dispersion and suspension performance of the coating is also challenged.
The common dispersing agent is adsorbed on the surface of inorganic pigment to generate steric hindrance and electrostatic repulsion, so that pigment particles can stably exist in a suspended state, the GCC coating with high solid content and low viscosity can be obtained, the grinding efficiency is greatly improved, and the grinding energy consumption can be saved.
With the development of coating processing technology, the requirement of coating grade superfine GCC coating for the particle size of less than 2 μm and up to 90% from 10 years ago is developed to the requirement of less than 1.5 μm and up to 98%, even 99% which are frequently seen in the market at present, and the requirement on the particle size distribution of the superfine GCC coating is higher and higher. In order to ensure the stability of the quality of the superfine calcium carbonate coating, better calcium carbonate grinding equipment and higher-quality special grinding dispersing agent are needed. In the grinding stage, the grinding dispersant is divided into a front-stage dispersant and a rear-stage dispersant. The latter stage dispersant has attracted more and more interest of the majority of papermaking workers due to market demand, high added value and the like, in particular to the modified acrylic dispersant.
Under the condition of high calcium carbonate content, the traditional grinding dispersant can cause higher viscosity of the coating, calcium carbonate flocculation is easy to cause and is not beneficial to grinding and coating, the particle size of the calcium carbonate in the coating is higher, the coating effect is influenced, and the quality of finished paper is influenced.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide a dispersing agent, a grinding dispersing agent and a coating for papermaking coating. The dosage of the grinding dispersant in the total calcium carbonate grinding process is lower, the effect is good, the cost is reduced, and the grinding dispersant is green and environment-friendly.
In order to achieve the above purpose, the invention provides a dispersant, which is prepared from the following components in parts by weight:
139-211 parts of water, namely,
80-100 parts of acrylic acid,
20-40 parts of 3-acrylamide-2-methylpropanesulfonic acid,
5-10 parts of methoxy polyethylene glycol itaconic acid monoester,
3-5 parts of benzyl phenylacrylate,
0.5 to 2 portions of oxidant,
2-5 parts of a reducing agent,
0.5 to 2 portions of functional monomer,
the functional monomer is at least one of 1,4-butanediol dimethacrylate, diethylene glycol dimethacrylate and triethylene glycol dimethacrylate.
Further, the dispersant is prepared according to the following steps:
(1) Stirring and mixing acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, methoxy polyethylene glycol itaconic acid monoester, benzyl phenylacrylate and functional monomer, and dissolving the solid completely for later use;
(2) Preparing a dropping liquid A and a dropping liquid B while performing the step (1), and dissolving the oxidant in a proper amount of water to prepare a solution A; dissolving the reducing agent in a proper amount of water to prepare a solution B;
(3) Adding bottom water into a reaction container, uniformly stirring and heating, keeping the temperature and stirring for 5-15min at the temperature of 75-85 ℃, adding dropwise added liquid A, B into the reaction container when the temperature of the system rises to 80-95 ℃, dropwise adding the mixture obtained in the step (1) into the reaction container to perform reaction, keeping the temperature at 80-95 ℃, keeping the temperature for reaction for 30-120min after reaction for 180-300min, and cooling to obtain the dispersing agent.
Further, the oxidant is selected from at least one of ammonium persulfate, potassium persulfate, sodium persulfate, dibenzoyl peroxide or azobisisobutyronitrile.
Further, the reducing agent is at least one selected from sodium metabisulfite, sodium bisulfite and sodium hypophosphite.
The invention also provides a grinding dispersant, which is obtained by neutralizing the dispersant to pH 4.0-7.0 by using an alkaline agent.
Further, the alkali agent is liquid alkali with the content of 48%.
Further, the grinding dispersion has a solid content of not less than 35%.
The invention also provides a coating for papermaking coating, which is prepared by utilizing the grinding dispersant.
The invention has the following beneficial effects:
(1) According to the dispersant disclosed by the invention, monomers such as 2-acrylamide-2-methylpropanesulfonic acid, methoxy polyethylene glycol itaconic acid monoester and benzyl acrylate are introduced to synthesize a polyfunctional polymer taking an acrylic acid chain segment as a main chain structure and benzyl acrylate as a secondary chain rigid structure, so that the steric hindrance effect among calcium slurry particles is enhanced, and the end group of the copolymer has various strong polar groups, so that pigment particles can be better adsorbed, and a good dispersion viscosity reduction effect is achieved;
(2) By introducing at least one of a plurality of functional monomers 1,4-butanediol dimethacrylate, diethylene glycol dimethacrylate and triethylene glycol dimethacrylate for graft modification, the charge number of the unit area of the surface double-electron layer of the ground calcium carbonate is more, so that the calcium carbonate particles have a more stable double-electron layer structure; meanwhile, the grinding dispersant polymer can form a spatial three-dimensional network structure around the calcium slurry particles in the grinding process of calcium carbonate, further enhances the steric hindrance effect among the particles, and improves the stability of the ground calcium slurry system and the particle size of the calcium slurry.
(3) The dispersant of the invention can improve the content of calcium carbonate during grinding, reduce the viscosity of a system and reduce the flocculation of calcium carbonate.
(4) The coating of the invention can obviously improve the whiteness, smoothness and glossiness of the finished paper, reduce the dosage of the grinding dispersant and reduce the cost.
Detailed Description
The present invention is described in detail below with reference to specific embodiments so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the scope of the present invention more clearly defined.
Example 1:
(1) mixing, stirring and dissolving 100g of acrylic acid, 40g of 2-acrylamide-2-methylpropanesulfonic acid, 10g of methoxy polyethylene glycol itaconic acid monoester, 5g of benzyl phenylacrylate and 2g of 1, 4-butanediol dimethacrylate for later use;
(2) while the step (1) is carried out, 2g of ammonium persulfate is dissolved into 18g of water to prepare an oxidant solution for later use; dissolving 5g of sodium metabisulfite into 32g of water to prepare a reducing agent solution for later use;
(3) adding 161g of bottom water into a four-neck flask, heating and stirring to 75-85 ℃, when the temperature is raised to 80-95 ℃, simultaneously dropwise adding the oxidant solution, the reducing agent solution in the step (2) and the mixed monomer solution in the step (1) into the four-neck flask for reacting, controlling the temperature to be 80-95 ℃, dropwise adding for reacting for 180-300min, then carrying out heat preservation for reacting for 30-120min, and cooling to below 30-40 ℃, thus preparing the dispersing agent;
(4) and (3) adjusting the pH value of the dispersing agent obtained in the step (3) to 4.0-7.0 by using liquid caustic soda (48%), and discharging to obtain the grinding dispersing agent.
Example 2:
(1) mixing, stirring and dissolving 100g of acrylic acid, 40g of 2-acrylamide-2-methylpropanesulfonic acid, 10g of methoxy polyethylene glycol itaconic acid monoester, 5g of benzyl phenylacrylate, 1g of 1, 4-butanediol dimethacrylate and 1g of triethylene glycol dimethacrylate for later use;
(2) while step (1) is carried out, dissolving 2g of ammonium persulfate into 18g of water to prepare an oxidant solution; dissolving 5g of sodium metabisulfite into 32g of water to prepare a reducing agent solution;
(3) adding 161g of bottom water into a four-mouth flask, heating and stirring to 75-85 ℃, adding the oxidant solution, the reducing agent solution and the mixed monomer solution obtained in the step (1) dropwise into the four-mouth flask to participate in reaction when the temperature is increased to 80-95 ℃, controlling the temperature to be 80-95 ℃, dropwise adding for reaction for 180-300min, then keeping the temperature for reaction for 30-120min, and cooling to below 30-40 ℃ to obtain the dispersing agent;
(4) and (3) adjusting the pH value of the dispersing agent obtained in the step (3) to 4.0-7.0 by using liquid caustic soda (48%), and discharging to obtain the grinding dispersing agent.
Example 3
(1) Mixing, stirring and dissolving 100g of acrylic acid, 40g of 2-acrylamide-2-methylpropanesulfonic acid, 10g of methoxy polyethylene glycol itaconic acid monoester, 5g of benzyl phenylacrylate, 1g of 1, 4-butanediol dimethacrylate and 1g of diethylene glycol dimethacrylate for later use;
(2) while the step (1) is carried out, 2g of ammonium persulfate is dissolved into 18g of water to prepare an oxidant solution; dissolving 5g of sodium metabisulfite into 32g of water to prepare a reducing agent solution;
(3) adding 161g of bottom water into a four-mouth flask, heating and stirring to 75-85 ℃, adding an oxidant solution, a reducing agent solution and the mixed monomer solution obtained in the step (1) into the four-mouth flask to participate in reaction when the temperature rises to 80-95 ℃, controlling the temperature to be 80-95 ℃, adding the oxidant solution and the reducing agent solution dropwise to react for 180-300min, then keeping the temperature to react for 30-120min, and cooling to below 30-40 ℃ to obtain the dispersing agent;
(4) and (3) adjusting the pH value of the dispersing agent obtained in the step (3) to 4.0-7.0 by using liquid caustic soda (48%), and discharging to obtain the grinding dispersing agent.
Example 4: preparation of coating for papermaking coating
(1) 490g of water is added into a 2L grinding tank, stirring is started, 6g of the grinding dispersant of the embodiment 1-3 of the invention is respectively added, 1510g of 400-mesh calcium carbonate powder is added after uniform stirring, grinding dispersant of 0.1-0.2% of the total mass of calcium carbonate is generally added for pre-dispersion, the mixture is added into a grinding machine for grinding and dispersion for 60-120min after pre-dispersion for 10min, and after grinding for 120min generally, the particle size is less than 2 μm when the particle size is 99% after being tested by a particle size analyzer, thus obtaining the ground calcium carbonate slurry.
The solid content of the grinding dispersant of the invention is about 39-41%, the grinding dispersant in the three examples of the invention is compared with the conventional commercially available grinding dispersant, the conventional commercially available grinding dispersant is a polycarboxylic acid system dispersant with better application effect in the current market, and the results are shown in table 1:
table 1 grind dispersant evaluation application data
As can be seen from the data measured in Table 1, the addition of 0.10% of the grinding dispersant of the present invention not only provides a good viscosity reduction and stabilization effect, but also provides a coating prepared from the grinding dispersant with a good particle size distribution ratio, and the solid content of the papermaking coating prepared from the grinding dispersant can reach 75% -76%.
In summary, the novel abrasive dispersant product of the present invention has the following advantages:
1. the production process of the product is simple, green and environment-friendly, and no waste is discharged;
2. the product adopts a polyfunctional group polymer with benzyl acrylate as a secondary chain rigid structure, the steric hindrance effect among calcium slurry particles is enhanced, and the end group of the copolymer has various strong polar groups, so that pigment particles can be better adsorbed, and a good dispersion viscosity reduction effect is achieved;
3. the product introduces a plurality of functional monomers for graft modification, so that the product has a more stable double electric layer structure, and simultaneously a novel space three-dimensional network structure can be formed around the slurry calcium particles in the grinding process of calcium carbonate, thereby improving the stability of the ground slurry calcium system and the particle size of the slurry calcium.
The above embodiments are provided only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to provide those skilled in the art with understanding and implementing the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (7)
1. The dispersing agent is characterized by being prepared from the following components in parts by weight:
139-211 parts of water, namely,
80-100 parts of acrylic acid, namely,
20-40 parts of 2-acrylamide-2-methylpropanesulfonic acid,
5-10 parts of methoxy polyethylene glycol itaconic acid monoester,
3-5 parts of benzyl phenylacrylate,
0.5 to 2 portions of oxidant,
2-5 parts of a reducing agent,
0.5 to 2 portions of functional monomer,
the functional monomer is at least one of 1,4-butanediol dimethacrylate, diethylene glycol dimethacrylate and triethylene glycol dimethacrylate,
the dispersant is prepared according to the following steps:
(1) Stirring and mixing acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, methoxy polyethylene glycol itaconic acid monoester, benzyl phenylacrylate and functional monomer, and dissolving the solid completely for later use;
(2) Preparing a dropping liquid A and a dropping liquid B while performing the step (1), and dissolving the oxidant in a proper amount of water to prepare a solution A; dissolving the reducing agent in a proper amount of water to prepare a solution B;
(3) Adding bottom water into a reaction container, uniformly stirring and heating, keeping the temperature and stirring for 5-15min at the temperature of 75-85 ℃, adding dropwise added liquid A, B into the reaction container when the temperature of the system rises to 80-95 ℃, dropwise adding the mixture obtained in the step (1) into the reaction container to perform reaction, keeping the temperature at 80-95 ℃, keeping the temperature for reaction for 30-120min after reaction for 180-300min, and cooling to obtain the dispersing agent.
2. The dispersant of claim 1, wherein the oxidizing agent is selected from at least one of ammonium persulfate, potassium persulfate, sodium persulfate, dibenzoyl peroxide, or azobisisobutyronitrile.
3. The dispersant of claim 1, wherein the reducing agent is selected from at least one of sodium metabisulfite, sodium bisulfite, and sodium hypophosphite.
4. A grinding dispersion agent, which is obtained by neutralizing the dispersion agent according to any one of claims 1 to 3 with an alkaline agent to a pH of 4.0 to 7.0.
5. The abrasive dispersion of claim 4, wherein the alkaline agent is a liquid alkali at 48%.
6. The milldispersant according to claim 5, characterized in that the solids content of the milldispersant is not less than 35%.
7. A coating material for papermaking coating, which is prepared by using the polishing dispersant as set forth in claim 4.
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| CN202011637404.3A CN112724308B (en) | 2020-12-31 | 2020-12-31 | Dispersant, grinding dispersant and coating for papermaking coating |
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| CN202011637404.3A CN112724308B (en) | 2020-12-31 | 2020-12-31 | Dispersant, grinding dispersant and coating for papermaking coating |
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| CN112724308A CN112724308A (en) | 2021-04-30 |
| CN112724308B true CN112724308B (en) | 2023-03-10 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102775546A (en) * | 2011-05-10 | 2012-11-14 | 永港伟方（北京）科技股份有限公司 | Branched polyacrylic acid dispersant, and preparation method and application thereof |
| CN107840964A (en) * | 2017-11-23 | 2018-03-27 | 浙江九本环保技术有限公司 | A kind of preparation method and application of the new viscosity reduction rheological agent of papermaking coating |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2810261B1 (en) * | 2000-06-15 | 2002-08-30 | Coatex Sa | USE OF LOW ANIONIC COPOLYMERS AS A DISPERSING AGENT AND / OR AID FOR GRINDING AQUEOUS SUSPENSION OF MINERALS, AQUEOUS SUSPENSIONS OBTAINED AND USES THEREOF |
| CN102076722A (en) * | 2008-06-24 | 2011-05-25 | 巴斯夫欧洲公司 | Paper coating agents containing metal salt pigments and aqueous dispersions of water-soluble copolymers |
| CN102675514B (en) * | 2011-07-12 | 2014-04-16 | 京东方科技集团股份有限公司 | Preparation method of aqueous nano-pigment dispersion liquid |
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2020
- 2020-12-31 CN CN202011637404.3A patent/CN112724308B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775546A (en) * | 2011-05-10 | 2012-11-14 | 永港伟方（北京）科技股份有限公司 | Branched polyacrylic acid dispersant, and preparation method and application thereof |
| CN107840964A (en) * | 2017-11-23 | 2018-03-27 | 浙江九本环保技术有限公司 | A kind of preparation method and application of the new viscosity reduction rheological agent of papermaking coating |
Non-Patent Citations (2)
| Title |
|---|
| Xue Zhang等.Synthesis and application of a polyacrylate dispersant on the preparation of ultrafine ground calcium carbonate in a laboratory stirred media mill.《Powder Technology》.2014,第266卷第218-227页. * |
| 马晓芳.聚丙烯酸酯型超分散剂的合成与应用.《中国优秀硕士学位论文全文数据库 工程科技I辑》.2015,(第2期),B018-19. * |
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