CN109694445B - Viscosity reducer, preparation method thereof and paper coating - Google Patents
Viscosity reducer, preparation method thereof and paper coating Download PDFInfo
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- CN109694445B CN109694445B CN201811533970.2A CN201811533970A CN109694445B CN 109694445 B CN109694445 B CN 109694445B CN 201811533970 A CN201811533970 A CN 201811533970A CN 109694445 B CN109694445 B CN 109694445B
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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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
- C08F4/00—Polymerisation catalysts
- C08F4/40—Redox systems
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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
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
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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
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
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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
- D21H19/56—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
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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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- 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
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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
- D21H21/06—Paper forming aids
- D21H21/12—Defoamers
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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
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Abstract
The invention belongs to the technical field of coatings, and provides a viscosity reducer which is prepared from the following raw materials in parts by weight: 10-62.5 parts of functional monomer; 1-25 parts of maleic anhydride; 10-50 parts of itaconic acid; 1-20 parts of a reducing agent; 10-150 parts of acrylic acid; 1-15 parts of an oxidant; 10-80 parts of inorganic base; 50-250 parts of water; the functional monomer comprises allyl polyoxyethylene ether or methallyl alcohol polyoxyethylene ether. The viscosity reducer provided by the invention has a good viscosity reducing effect, particularly has a good high-shear viscosity reducing effect, is green, environment-friendly and degradable.
Description
Technical Field
The invention relates to the field of coatings, and particularly relates to a viscosity reducer, a preparation method thereof and a paper coating.
Background
Paper coating is an important factor in determining the quality of the paper end product and the coating process, and ideally paper coating is a pseudoplastic fluid with a certain thixotropy, i.e. a fluid characteristic of shear thinning or viscosity reduction. The coating material running performance not only refers to the coating machine running performance, but also includes the running performance in the whole coating process, and good coating material rheological property needs to meet the requirements of various aspects, including the processes of pumping, sieving, feeding, metering, sizing, refluxing, leveling and the like. If the rheological property of the coating cannot meet the corresponding requirement, the runnability problem is generated, and most of the viscosity reducers on the market can effectively control the viscosity of the coating under low shear so that the coating can have proper rheological property and the coating can run well. However, the development trend of future coating technology is: (1) the paper machine is large-sized and high-speed, the coating speed can reach 1800-2000 m/min at most, and a coating machine with the speed close to 3000m/min abroad is developed; (2) the paint is developed to higher solid content, and the solid content of part of the paint reaches more than 70 percent. To meet this trend, it is generally required to run the paper machine faster during coating, the coating speed is increased, and high shear is caused, however, the viscosity of the coating material is increased significantly under high shear, which affects the paper quality. The traditional viscosity reducer has an unsatisfactory viscosity reducing effect on a coating under a high shear condition, and easily causes the problems of drying on a roller, coating streaks and the like, thereby affecting the actual use effect of paper.
Disclosure of Invention
The invention aims to provide a viscosity reducer, a preparation method thereof and a paper coating.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a viscosity reducer which is prepared from the following raw materials in parts by weight:
the functional monomer comprises allyl polyoxyethylene ether or methallyl alcohol polyoxyethylene ether.
Preferably, the oxidant comprises one or two of ammonium persulfate, sodium persulfate and potassium persulfate.
Preferably, the reducing agent comprises one or both of sodium hypophosphite and sodium bisulfite.
Preferably, the inorganic base comprises sodium hydroxide, potassium hydroxide or aqueous ammonia.
Preferably, the pH value of the viscosity reducer is 6-7.
The invention provides a preparation method of the viscosity reducer in the technical scheme, which comprises the following steps:
(1) mixing a functional monomer, maleic anhydride, part of itaconic acid, part of a reducing agent and water, and mixing at 78-85 ℃ to obtain first slurry;
(2) mixing the first slurry with part of acrylic acid and part of oxidant, preserving heat for 2.5-3.5 hours at the temperature of 75-85 ℃, and carrying out polymerization reaction to obtain a second slurry;
(3) mixing the second slurry with the residual itaconic acid, the residual reducing agent, the residual acrylic acid and the residual oxidizing agent, preserving the heat for 2.5-3.5 hours at the temperature of 75-85 ℃, and carrying out polymerization reaction to obtain a third slurry;
(4) and mixing the third slurry with inorganic base to obtain the viscosity reducer.
Preferably, the mixing in the step (1) is specifically: heating and melting the functional monomer at 80 ℃, mixing the obtained molten functional monomer with part of water, maleic anhydride, part of itaconic acid and part of reducing agent, and then mixing the obtained mixed material with the rest of water.
Preferably, the mixing in the step (2) is specifically: sequentially adding portions of the acrylic acid and the oxidizing agent dropwise to the first slurry; the total dropping time of the part of acrylic acid and the part of oxidant is 1-1.5 h.
Preferably, the mixing in the step (3) is specifically: mixing the second slurry with the residual itaconic acid and the residual reducing agent, and then sequentially dropwise adding the residual acrylic acid and the residual oxidizing agent into the obtained mixed material; the total dropping time of the residual acrylic acid and the residual oxidant is 1-1.5 h.
The invention provides a paper coating which comprises the following preparation raw materials: calcium carbonate, china clay, latex, a dispersing agent, a defoaming agent, a viscosity reducer, alkali liquor and water; the viscosity reducer is the viscosity reducer in the scheme or prepared by the preparation method in the scheme.
The invention takes allyl polyoxyethylene ether or methallyl alcohol polyoxyethylene ether as a functional monomer, and the functional monomer is subjected to copolymerization reaction with maleic anhydride, itaconic acid and acrylic acid under the action of a reducing agent, an oxidizing agent and water, and the pH value is adjusted by inorganic base, so as to obtain a copolymer consisting of functional groups and a long-chain structure, wherein the functional groups comprise carboxyl and hydroxyl. The viscosity reducer provided by the invention can be adsorbed on the surface of solid particles in a coating, the solid particles are wrapped in the viscosity reducer, the surface of the solid particles is provided with the same charges by utilizing functional groups in the viscosity reducer, and the solid particles cannot approach to flocculation under the principle that the same charges repel each other, so that the effects of dispersing and preventing precipitation are achieved; meanwhile, the viscosity reducer provided by the invention can enable the surfaces of solid particles in the coating to form a bilayer structure, the polar end of the outer layer has stronger affinity with water, the degree of wetting of the solid particles by water is increased, and the solid particles are far away due to electrostatic repulsion force; in addition, the viscosity reducer provided by the invention can be well adsorbed on the surface of solid particles, and can be firmly adsorbed on the surface of the solid particles even under the action of high shear force, so that the effect of reducing high shear viscosity is achieved. In addition, the viscosity reducer provided by the invention has a good viscosity reducing effect under low shear, is degradable and is environment-friendly.
The preparation method of the viscosity reducer provided by the invention is simple to operate and suitable for large-scale production.
Detailed Description
The invention provides a viscosity reducer which is prepared from the following raw materials in parts by weight:
the functional monomer comprises allyl polyoxyethylene ether or methallyl alcohol polyoxyethylene ether.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
In the present invention, the mixing is a material mixing means which is commonly used by those skilled in the art unless otherwise specified.
In the invention, the raw materials for preparing the viscosity reducer comprise 10-62.5 parts by weight of functional monomers, preferably 25-62.5 parts by weight, and more preferably 25-50 parts by weight. In the present invention, the functional monomer includes allyl polyoxyethylene ether or methallyl alcohol polyoxyethylene ether. In the invention, the functional monomer contains longer molecular chains, and provides a long-chain structure for grafting other functional groups.
In the invention, the raw material for preparing the viscosity reducer comprises 1-25 parts by weight of maleic anhydride, preferably 12.5-25 parts by weight of maleic anhydride, and more preferably 25 parts by weight of the functional monomer.
In the invention, the raw materials for preparing the viscosity reducer comprise 10-50 parts of itaconic acid, preferably 37.5-50 parts, based on the weight parts of the functional monomer.
In the invention, the raw materials for preparing the viscosity reducer comprise 1-20 parts of reducing agent, preferably 12-20 parts, and more preferably 14-16 parts by weight of the functional monomer. In the present invention, the reducing agent preferably includes one or both of sodium hypophosphite and sodium bisulfite. In the invention, the reducing agent plays a role of reduction, and is an excellent inorganic dispersant, so that the dispersing effect of the viscosity reducer can be improved.
In the invention, the raw materials for preparing the viscosity reducer comprise 10-150 parts by weight of acrylic acid, preferably 62.5-75 parts by weight of the functional monomer.
In the invention, the raw materials for preparing the viscosity reducer comprise 1-15 parts by weight of oxidant, preferably 12-14 parts by weight of functional monomer. In the present invention, the oxidizing agent preferably includes one or two of ammonium persulfate, sodium persulfate, and potassium persulfate. In the present invention, the oxidizing agent functions both as an oxidizing agent and an initiator, and can promote the polymerization of the raw materials.
In the invention, the raw materials for preparing the viscosity reducer comprise 10-80 parts of inorganic base, preferably 50-70 parts of inorganic base, and more preferably 60-70 parts of inorganic base by weight of the functional monomer. In the present invention, the inorganic base preferably includes sodium hydroxide, potassium hydroxide or aqueous ammonia, more preferably sodium hydroxide.
In the invention, the raw materials for preparing the viscosity reducer comprise 50-250 parts of water, preferably 100-140 parts of water, and more preferably 120-140 parts of water, based on the weight parts of the functional monomer.
The invention provides a preparation method of the viscosity reducer in the technical scheme, which comprises the following steps:
(1) mixing a functional monomer, maleic anhydride, part of itaconic acid, part of a reducing agent and water, and mixing at 78-85 ℃ to obtain first slurry;
(2) mixing the first slurry with part of acrylic acid and part of oxidant, preserving heat for 2.5-3.5 hours at the temperature of 75-85 ℃, and carrying out polymerization reaction to obtain a second slurry;
(3) mixing the second slurry with the residual itaconic acid, the residual reducing agent, the residual acrylic acid and the residual oxidizing agent, preserving the heat for 2.5-3.5 hours at the temperature of 75-85 ℃, and carrying out polymerization reaction to obtain a third slurry;
(4) and mixing the third slurry with inorganic base to obtain the viscosity reducer.
The method comprises the steps of mixing a functional monomer, maleic anhydride, part of itaconic acid, part of reducing agent and water, and mixing at 78-85 ℃ to obtain first slurry. In the invention, the mixing temperature is preferably 79-82 ℃, and most preferably 80 ℃; the partial itaconic acid preferably accounts for 45-60% of the total amount of the itaconic acid, and the partial reducing agent preferably accounts for 40-50% of the total amount of the reducing agent.
In the present invention, the functional monomer, maleic anhydride, part of itaconic acid, part of reducing agent and water are preferably mixed as follows: heating and melting a functional monomer at 80 ℃, mixing the obtained molten functional monomer with part of water, maleic anhydride, part of itaconic acid and part of reducing agent, and then mixing the obtained mixed material with the rest of water; the part of water preferably accounts for 76-85% of the total amount of water, and more preferably 79-83%. In the invention, the functional monomer, the maleic anhydride, part of itaconic acid and water are mixed under a reduction condition to carry out a polymerization reaction, and carboxyl is introduced to a molecular chain of the functional monomer, so that the dispersion uniformity of the coating is improved, and the viscosity reduction effect is improved.
After the first slurry is obtained, mixing the first slurry with part of acrylic acid and part of oxidant, preserving heat for 2.5-3.5 hours at the temperature of 75-85 ℃, and carrying out polymerization reaction to obtain a second slurry. In the invention, the part of acrylic acid preferably accounts for 45-60% of the total amount of acrylic acid, and the part of oxidant preferably accounts for 50-55% of the total amount of oxidant.
In the present invention, the mixing of the first slurry with a portion of acrylic acid and a portion of the oxidizing agent is preferably: and sequentially dripping part of acrylic acid and part of oxidant into the first slurry, wherein the total dripping time of the part of acrylic acid and the part of oxidant is 1-1.5 h, and more preferably 1 h. In the invention, the first slurry is mixed with part of acrylic acid and part of oxidant to carry out polymerization reaction, and carboxyl is introduced on the basis of the obtained first slurry, thus being beneficial to improving the dispersion uniformity of the coating and improving the viscosity reduction effect.
After the second slurry is obtained, mixing the second slurry with the residual itaconic acid, the residual reducing agent, the residual acrylic acid and the residual oxidizing agent, and preserving heat for 2.5-3.5 hours at the temperature of 75-85 ℃ to obtain a third slurry. In the invention, the mixing of the second slurry with the residual itaconic acid, the residual reducing agent, the residual acrylic acid and the residual oxidizing agent is specifically as follows: mixing the second slurry with the residual itaconic acid and the residual reducing agent, and then sequentially dropwise adding the residual acrylic acid and the residual oxidizing agent into the obtained mixed material; the total dropping time of the residual acrylic acid and the residual oxidant is 1-1.5 h, and more preferably 1 h.
After the third slurry is obtained, the viscosity reducer is obtained by mixing the third slurry with inorganic base. In the invention, the third slurry and the inorganic base are mixed, preferably stirred and mixed at the temperature of below 45 ℃, and the pH value is adjusted to 6-7, so that the viscosity reducer is obtained. In the invention, because the obtained third slurry contains carboxyl and is acidic, when the third slurry is mixed with inorganic base, the temperature of the viscosity reducer is sharply increased due to heat release caused by acid-base neutralization reaction, and the performance of the viscosity reducer is influenced.
In the invention, the itaconic acid and the acrylic acid are added in two steps, two different molecular chains exist in the synthesized viscosity reducer, wherein the molecular chain obtained from the second slurry contains more functional monomers, the molecular weight, the chain length and the steric hindrance effect are good, the molecular chain obtained from the third slurry contains less functional monomers, the molecular weight is low, and the viscosity reducer can be ensured to have good wetting and dispersing performances. Through the stepwise addition of itaconic acid and acrylic acid, a good high-shear viscosity reduction effect can be ensured, and a good viscosity reduction effect can be achieved under low shear.
The invention also provides a paper coating which comprises the following preparation raw materials: calcium carbonate, china clay, latex, a dispersing agent, a defoaming agent, a viscosity reducer, inorganic base and water; the viscosity reducer is the viscosity reducer in the scheme or prepared by the preparation method in the scheme.
In the present invention, the paper coating preferably comprises the following preparation raw materials in parts by weight: 85-95 parts of calcium carbonate, 5-15 parts of porcelain clay, 8-14 parts of latex, 0.1-0.3 part of dispersing agent, 0.1-0.3 part of defoaming agent, 0.1-0.3 part of viscosity reducer, 5-15 parts of water and the dosage of inorganic base is based on adjusting the pH value of the paper coating to 8.7-9.0.
In the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
In the present invention, the preparation method of the paper coating preferably comprises the steps of: adding a dispersing agent, porcelain clay and calcium carbonate into water in sequence, and uniformly stirring to obtain a first mixed solution; then sequentially adding the viscosity reducer and the latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding alkali liquor into the second mixed solution, adjusting the pH value to 8.7-9.0, adding a defoaming agent, and uniformly stirring to obtain the paper coating. The stirring mode is not particularly limited in the invention, and a conventional stirring mode in the field can be adopted.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Example 1
Putting 62.5 parts by weight of allyl polyoxyethylene ether into a four-neck flask, heating to 80 ℃ to melt the allyl polyoxyethylene ether, then adding 200 parts by weight of water, heating to 80 ℃, sequentially adding 25 parts by weight of maleic anhydride, 22.5 parts by weight of itaconic acid, 6.4 parts by weight of sodium hypophosphite and 42 parts by weight of water, and heating to 80 ℃ to obtain a first slurry;
sequentially dropwise adding 28.13 parts of acrylic acid and 7 parts of ammonium persulfate into the first slurry, wherein the total dropwise adding time is 1h, and keeping the temperature at 80 ℃ for 2.5h to obtain second slurry;
adding 27.5 parts of itaconic acid and 9.6 parts of sodium hypophosphite into the second slurry, then sequentially dropwise adding 34.37 parts of acrylic acid and 7 parts of ammonium persulfate, wherein the total dropwise adding time is 1h, and keeping the temperature at 80 ℃ for 3h to obtain a third slurry;
and cooling the obtained third slurry to 45 ℃, adding 50 parts of sodium hydroxide, and stirring for 0.5h to obtain the viscosity reducer.
Adding 0.2 part of dispersing agent, 10 parts of porcelain clay and 90 parts of 98-grade calcium carbonate into 9 parts of water in sequence according to parts by weight, and uniformly stirring to obtain a first mixed solution; then sequentially adding 0.2 part of viscosity reducer and 11 parts of latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding a proper amount of inorganic base into the second mixed solution to adjust the pH value to 8.7-9.0, finally adding 0.2 part of defoaming agent, and uniformly stirring to obtain the paper coating.
Example 2
Putting 50 parts by weight of methallyl alcohol polyoxyethylene ether into a four-neck flask, heating to 80 ℃ to melt the methallyl alcohol polyoxyethylene ether, then adding 180 parts of water, heating to 80 ℃, sequentially adding 12.5 parts of maleic anhydride, 22.5 parts of itaconic acid, 7 parts of sodium hypophosphite and 44 parts of water, and heating to 80 ℃ to obtain a first slurry;
sequentially dripping 60 parts of acrylic acid and 7.7 parts of ammonium persulfate into the first slurry, wherein the total dripping time is 1h, and keeping the temperature for 3h at 80 ℃ to obtain second slurry;
adding 15 parts of itaconic acid and 7 parts of sodium hypophosphite into the second slurry, then sequentially dropwise adding 40 parts of acrylic acid and 6.3 parts of ammonium persulfate, wherein the total dropwise adding time is 1.5h, and keeping the temperature at 80 ℃ for 3h to obtain a third slurry;
and cooling the obtained third slurry to 45 ℃, adding 70 parts of sodium hydroxide, and stirring for 0.5h to obtain the viscosity reducer.
Adding 0.2 part of dispersing agent, 10 parts of porcelain clay and 90 parts of 98-grade calcium carbonate into 9 parts of water in sequence according to parts by weight, and uniformly stirring to obtain a first mixed solution; then sequentially adding 0.2 part of viscosity reducer and 11 parts of latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding a proper amount of inorganic base into the second mixed solution to adjust the pH value to 8.7-9.0, finally adding 0.2 part of defoaming agent, and uniformly stirring to obtain the paper coating.
Example 3
Putting 50 parts by weight of allyl polyoxyethylene ether into a four-neck flask, heating to 80 ℃ to melt the allyl polyoxyethylene ether, then adding 190 parts of water, heating to 80 ℃, sequentially adding 25 parts of maleic anhydride, 23.5 parts of itaconic acid, 9 parts of sodium hypophosphite and 46 parts of water, and heating to 80 ℃ to obtain first slurry;
dropwise adding 34.5 parts of acrylic acid and 6.36 parts of ammonium persulfate into the first slurry in sequence, wherein the total dropwise adding time is 1h, and keeping the temperature at 80 ℃ for 3.5 to obtain second slurry;
adding 26.5 parts of itaconic acid and 11 parts of sodium hypophosphite into the second slurry, then sequentially dropwise adding 40.5 parts of acrylic acid and 5.64 parts of ammonium persulfate, wherein the total dropwise adding time is 1.5h, and keeping the temperature at 80 ℃ for 3h to obtain a third slurry;
and cooling the obtained third slurry to 45 ℃, adding 60 parts of sodium hydroxide, and stirring for 0.5h to obtain the viscosity reducer.
Adding 0.2 part of dispersing agent, 10 parts of porcelain clay and 90 parts of 98-grade calcium carbonate into 9 parts of water in sequence according to parts by weight, and uniformly stirring to obtain a first mixed solution; then sequentially adding 0.2 part of viscosity reducer and 11 parts of latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding a proper amount of inorganic base into the second mixed solution to adjust the pH value to 8.7-9.0, finally adding 0.2 part of defoaming agent, and uniformly stirring to obtain the paper coating.
Example 4
Placing 25 parts by weight of methallyl alcohol polyoxyethylene ether into a four-neck flask, heating to 80 ℃ to melt the methallyl alcohol polyoxyethylene ether, then adding 180 parts of water, heating to 80 ℃, sequentially adding 25 parts of maleic anhydride, 30 parts of itaconic acid, 8 parts of sodium hypophosphite and 44 parts of water, and heating to 80 ℃ to obtain a first slurry;
sequentially dripping 60 parts of acrylic acid and 6.6 parts of ammonium persulfate into the first slurry, wherein the total dripping time is 1h, and keeping the temperature for 3h at 80 ℃ to obtain second slurry;
adding 20 parts of itaconic acid and 8 parts of sodium hypophosphite into the second slurry, then sequentially dropwise adding 40 parts of acrylic acid and 5.4 parts of ammonium persulfate, wherein the total dropwise adding time is 1.5h, and keeping the temperature at 80 ℃ for 3h to obtain a third slurry;
and cooling the obtained third slurry to 45 ℃, adding 70 parts of sodium hydroxide, stirring for 0.5h, and adjusting the pH value to 6 to obtain the viscosity reducer.
Adding 0.2 part of dispersing agent, 10 parts of porcelain clay and 90 parts of 98-grade calcium carbonate into 9 parts of water in sequence according to parts by weight, and uniformly stirring to obtain a first mixed solution; then sequentially adding 0.2 part of viscosity reducer and 11 parts of latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding a proper amount of inorganic base into the second mixed solution to adjust the pH value to 8.7-9.0, finally adding 0.2 part of defoaming agent, and uniformly stirring to obtain the paper coating.
Example 5
Placing 25 parts by weight of allyl polyoxyethylene ether into a four-neck flask, heating to 80 ℃ to melt the allyl polyoxyethylene ether, then adding 174 parts of water, heating to 80 ℃, sequentially adding 25 parts of maleic anhydride, 23 parts of itaconic acid, 5 parts of sodium hypophosphite and 45 parts of water, and heating to 80 ℃ to obtain a first slurry;
sequentially dropwise adding 67.5 parts of acrylic acid and 6 parts of ammonium persulfate into the first slurry, wherein the total dropwise adding time is 1h, and keeping the temperature at 80 ℃ for 3.5h to obtain second slurry;
adding 27 parts of itaconic acid and 7 parts of sodium hypophosphite into the second slurry, then sequentially dropwise adding 82.5 parts of acrylic acid and 6 parts of ammonium persulfate, wherein the total dropwise adding time is 1.5h, and keeping the temperature at 80 ℃ for 3h to obtain a third slurry;
and cooling the obtained third slurry to 45 ℃, adding 70 parts of sodium hydroxide, and stirring for 0.5h to obtain the viscosity reducer.
Adding 0.2 part of dispersing agent, 10 parts of porcelain clay and 90 parts of 98-grade calcium carbonate into 9 parts of water in sequence according to parts by weight, and uniformly stirring to obtain a first mixed solution; then sequentially adding 0.2 part of viscosity reducer and 11 parts of latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding a proper amount of inorganic base into the second mixed solution to adjust the pH value to 8.7-9.0, finally adding 0.2 part of defoaming agent, and uniformly stirring to obtain the paper coating.
Comparative example 1
Adding 0.2 part of dispersing agent, 10 parts of porcelain clay and 90 parts of 98-grade calcium carbonate into 9 parts of water in sequence according to parts by weight, and uniformly stirring to obtain a first mixed solution; then adding 11 parts of latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding a proper amount of inorganic base into the second mixed solution to adjust the pH value to 8.7-9.0, finally adding 0.2 part of defoaming agent, and uniformly stirring to obtain the paper coating.
Comparative example 2
Adding 0.2 part of dispersing agent, 10 parts of porcelain clay and 90 parts of 98-grade calcium carbonate into 9 parts of water in sequence according to parts by weight, and uniformly stirring to obtain a first mixed solution; then sequentially adding 0.2 part of commercially available viscosity reducer 1 and 11 parts of latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding a proper amount of inorganic base into the second mixed solution to adjust the pH value to 8.7-9.0, finally adding 0.2 part of defoaming agent, and uniformly stirring to obtain the paper coating.
Comparative example 3
Adding 0.2 part of dispersing agent, 10 parts of porcelain clay and 90 parts of 98-grade calcium carbonate into 9 parts of water in sequence according to parts by weight, and uniformly stirring to obtain a first mixed solution; then sequentially adding 0.2 part of commercially available viscosity reducer 2 and 11 parts of latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; and adding a proper amount of inorganic base into the second mixed solution to adjust the pH value to 8.7-9.0, finally adding 0.2 part of defoaming agent, and uniformly stirring to obtain the paper coating.
Example 6
The viscosity reducer prepared in the embodiment 1-5 is subjected to performance test, and the test results are shown in table 1:
TABLE 1 Performance test results for viscosity reducers prepared in examples 1-5
Example 7
The paper coatings prepared in examples 1-5 and comparative examples 1-3 were subjected to performance testing, and the test results are shown in table 2:
table 2 paper coating performance test results
As can be seen from tables 1-2, the viscosity reducer provided by the invention can greatly reduce the viscosity of a paper coating, and particularly has an excellent viscosity reducing effect under the action of high shear.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A paper coating comprises the following preparation raw materials: calcium carbonate, china clay, latex, a dispersing agent, a defoaming agent, a viscosity reducer, alkali liquor and water;
the preparation method of the paper coating comprises the following steps: adding a dispersing agent, porcelain clay and calcium carbonate into water in sequence, and uniformly stirring to obtain a first mixed solution; then sequentially adding the viscosity reducer and the latex into the first mixed solution, and uniformly stirring to obtain a second mixed solution; adding alkali liquor into the second mixed solution, adjusting the pH value to 8.7-9.0, adding a defoaming agent, and uniformly stirring to obtain the paper coating;
the viscosity reducer is prepared from the following raw materials in parts by weight:
the functional monomer is allyl polyoxyethylene ether or methallyl alcohol polyoxyethylene ether;
the preparation method of the viscosity reducer comprises the following steps:
(1) mixing a functional monomer, maleic anhydride, part of itaconic acid, part of a reducing agent and water, and mixing at 78-85 ℃ to obtain first slurry; the part of itaconic acid accounts for 45-60% of the total amount of itaconic acid, and the part of reducing agent accounts for 40-50% of the total amount of reducing agent; the mixing is specifically as follows: heating and melting a functional monomer at 80 ℃, mixing the obtained molten functional monomer with part of water, maleic anhydride, part of itaconic acid and part of reducing agent, and then mixing the obtained mixed material with the rest of water;
(2) mixing the first slurry with part of acrylic acid and part of oxidant, preserving heat for 2.5-3.5 hours at the temperature of 75-85 ℃, and carrying out polymerization reaction to obtain a second slurry; the part of acrylic acid accounts for 45-60% of the total amount of acrylic acid, and the part of oxidant accounts for 50-55% of the total amount of oxidant;
(3) mixing the second slurry with the residual itaconic acid, the residual reducing agent, the residual acrylic acid and the residual oxidizing agent, preserving the heat for 2.5-3.5 hours at the temperature of 75-85 ℃, and carrying out polymerization reaction to obtain a third slurry;
(4) and mixing the third slurry with inorganic base to obtain the viscosity reducer.
2. A paper coating according to claim 1, wherein the oxidizing agent comprises one or more of ammonium persulfate, sodium persulfate, and potassium persulfate.
3. A paper coating as claimed in claim 1, wherein the reducing agent comprises one or both of sodium hypophosphite and sodium bisulfite.
4. A paper coating according to claim 1, characterized in that the inorganic base comprises sodium hydroxide, potassium hydroxide or ammonia.
5. A paper coating according to any one of claims 1 to 4, characterised in that the viscosity reducing agent has a pH of from 6 to 7.
6. A paper coating as claimed in claim 1, wherein the mixing in step (2) is in particular: sequentially adding portions of the acrylic acid and the oxidizing agent dropwise to the first slurry; the total dropping time of the part of acrylic acid and the part of oxidant is 1-1.5 h.
7. A paper coating as claimed in claim 1, wherein the mixing in step (3) is in particular: mixing the second slurry with the residual itaconic acid and the residual reducing agent, and then sequentially dropwise adding the residual acrylic acid and the residual oxidizing agent into the obtained mixed material; the total dropping time of the residual acrylic acid and the residual oxidant is 1-1.5 h.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102093501A (en) * | 2010-11-26 | 2011-06-15 | 深圳海川新材料科技有限公司 | Method for preparing hyper-dispersant used for mixed size |
| CN103468028A (en) * | 2013-10-08 | 2013-12-25 | 深圳市瑞成科讯实业有限公司 | Efficient calcium slurry dispersant and preparation method thereof |
| CN105754047A (en) * | 2016-04-01 | 2016-07-13 | 贵州铁建恒发新材料科技股份有限公司 | Phosphate containing high-adaptability polycarboxylate superplasticizer and preparation method thereof |
| CN106519114A (en) * | 2016-11-16 | 2017-03-22 | 山东泰和水处理科技股份有限公司 | Preparation method and application of calcium carbonate dispersing agent |
| CN106905464A (en) * | 2017-04-01 | 2017-06-30 | 深圳市瑞成科讯实业有限公司 | A kind of calcium carbonate slurry dispersant and preparation method thereof |
| CN107236089A (en) * | 2017-05-27 | 2017-10-10 | 湖南金华达建材有限公司 | A kind of low viscous type polycarboxylate water-reducer and its simple method for preparing |
| 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 |
|---|---|---|---|---|
| US600190A (en) * | 1898-03-08 | Sarkis s | ||
| DE102009057632A1 (en) * | 2009-12-09 | 2011-06-16 | Leibniz-Institut Für Polymerforschung Dresden E.V. | Solvent-free reactive adhesive, useful for fiber flocking of a substrate for dissipating the electrostatic fiber charges, comprises a mixture, which is produced from various radically reactive chemical polymers and monomeric compounds |
| BR112013015120B1 (en) * | 2010-12-17 | 2020-11-03 | Basf Se | method of producing a polymer, polymer, suspension, and, use of a suspension |
-
2018
- 2018-12-14 CN CN201811533970.2A patent/CN109694445B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102093501A (en) * | 2010-11-26 | 2011-06-15 | 深圳海川新材料科技有限公司 | Method for preparing hyper-dispersant used for mixed size |
| CN103468028A (en) * | 2013-10-08 | 2013-12-25 | 深圳市瑞成科讯实业有限公司 | Efficient calcium slurry dispersant and preparation method thereof |
| CN105754047A (en) * | 2016-04-01 | 2016-07-13 | 贵州铁建恒发新材料科技股份有限公司 | Phosphate containing high-adaptability polycarboxylate superplasticizer and preparation method thereof |
| CN106519114A (en) * | 2016-11-16 | 2017-03-22 | 山东泰和水处理科技股份有限公司 | Preparation method and application of calcium carbonate dispersing agent |
| CN106905464A (en) * | 2017-04-01 | 2017-06-30 | 深圳市瑞成科讯实业有限公司 | A kind of calcium carbonate slurry dispersant and preparation method thereof |
| CN107236089A (en) * | 2017-05-27 | 2017-10-10 | 湖南金华达建材有限公司 | A kind of low viscous type polycarboxylate water-reducer and its simple method for preparing |
| 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 |
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