CN114031723A - Styrene-acrylic emulsion for papermaking and preparation method thereof - Google Patents
Styrene-acrylic emulsion for papermaking and preparation method thereof Download PDFInfo
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- CN114031723A CN114031723A CN202111458920.4A CN202111458920A CN114031723A CN 114031723 A CN114031723 A CN 114031723A CN 202111458920 A CN202111458920 A CN 202111458920A CN 114031723 A CN114031723 A CN 114031723A
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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
- C08F257/00—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
- C08F257/02—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00 on to polymers of styrene or alkyl-substituted styrenes
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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
- C08F2/00—Processes of polymerisation
- C08F2/01—Processes of polymerisation characterised by special features of the polymerisation apparatus used
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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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Abstract
The invention discloses a styrene-acrylic emulsion for papermaking and a preparation method thereof, wherein the method comprises the following steps: weighing the raw materials in proportion, preparing an aqueous solution of a mixture, allowing the aqueous solution to enter a dynamic tubular reactor at a temperature of 80-130 ℃, performing free radical emulsion copolymerization for 5-60 minutes, adjusting the pH of a reaction product to 5-9 with an alkaline substance, and filtering to obtain a styrene-acrylic emulsion for papermaking; each raw material comprises a seed emulsion, a carboxylic acid monomer, a (methyl) acrylate monomer, a (methyl) styrene monomer, siloxane, an anionic emulsifier, a nonionic emulsifier and an initiator. The invention also provides the styrene-acrylic emulsion for papermaking prepared by the method. The invention carries out emulsion polymerization by using the dynamic tubular reactor, compared with kettle type reaction, the dynamic tubular reactor has the advantages of high reaction speed, high production efficiency and high safety coefficient, and is applied to the coating of the paper making surface coating, and the smoothness of paper is good.
Description
Technical Field
The invention relates to a binder for papermaking coating and a preparation method thereof, in particular to a styrene-acrylic emulsion for papermaking and a preparation method thereof.
Background
The styrene-acrylic emulsion is widely used for bonding paper coatings, and the requirements on the performance of the emulsion are higher and higher in the application process. With the improvement and development of emulsion application process technology, the emulsion is required to have good process applicability, wherein the gloss and other properties of paper printing can be improved by partially or completely replacing conventional styrene-butadiene latex with styrene-acrylic emulsion in papermaking coating.
The styrene-acrylic emulsion is produced by a reaction kettle intermittently, the used acrylic ester/styrene monomer is different from several tons to dozens of tons in the process, and the danger coefficient of the process is high.
Chinese patent CN107556418A discloses a styrene-acrylic emulsion for papermaking and a preparation method thereof, the VOC (volatile organic compound) of the prepared emulsion applied to paper coating is lower, but the smoothness of paper is still to be improved, and the risk coefficient of the process is large.
Disclosure of Invention
The invention aims to provide a styrene-acrylic emulsion for papermaking for a papermaking coating adhesive and a preparation method thereof, which can overcome the defects of the prior art, and a dynamic tubular reactor is used for replacing a common kettle-type reactor, so that compared with the common styrene-acrylic emulsion for papermaking, the styrene-acrylic emulsion for papermaking has the advantages of high production efficiency and high safety factor; the obtained styrene-acrylic emulsion is used for paper in papermaking coating and has higher smoothness.
In order to achieve the aim, the invention provides a preparation method of styrene-acrylic emulsion for papermaking, wherein the preparation method comprises the following steps: weighing the raw materials in proportion, preparing an aqueous solution of a mixture, allowing the aqueous solution to enter a dynamic tubular reactor at a temperature of 80-130 ℃, performing free radical emulsion copolymerization for 5-60 minutes, adjusting the pH of a reaction product to 5-9 with an alkaline substance, and filtering to obtain a styrene-acrylic emulsion for papermaking; each raw material comprises a seed emulsion, a carboxylic acid monomer, a (methyl) acrylate monomer, a (methyl) styrene monomer, siloxane, an anionic emulsifier, a nonionic emulsifier and an initiator.
The preparation method of the styrene-acrylic emulsion for papermaking comprises the following steps of: 1-10 parts of seed emulsion, 1-10 parts of carboxylic acid monomer, 50-150 parts of (methyl) acrylate monomer, 100 parts of (methyl) styrene monomer, 0.5-5 parts of siloxane, 0.5-5 parts of anionic emulsifier, 0.2-5 parts of nonionic emulsifier and 0.5-5 parts of initiator.
The preparation method of the styrene-acrylic emulsion for papermaking comprises the step of preparing a styrene-acrylic emulsion, wherein the styrene-acrylic emulsion is a polystyrene seed emulsion with the solid content of 20-40% and the particle size of 20-50 nm in percentage by weight.
In the preparation method of the styrene-acrylic emulsion for papermaking, the carboxylic acid monomer is any one or more of acrylic acid, methacrylic acid, maleic acid, fumaric acid and itaconic acid.
The preparation method of the styrene-acrylic emulsion for papermaking comprises the step of preparing the (methyl) acrylic ester monomer from methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate or C-methacrylic acid8～C16Any one or more of alkyl esters.
In the preparation method of the styrene-acrylic emulsion for papermaking, the siloxane is any one or more of N-beta-aminoethyl-gamma-aminopropylmethyldimethoxysilane, gamma-mercaptopropyltrimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane and trimethoxysilane.
The preparation method of the styrene-acrylic emulsion for papermaking comprises the following steps ofC10～C20Sodium alkyl benzene sulfonate, C10～C20Sodium alkylnaphthalenesulfonate, C10～C20Any one or more of sodium alkyl sulfate, sodium dialkyl-2-sulfosuccinate, sodium dicyclohexyl-2-sulfosuccinate, sodium oleate, potassium oleate, triethanolamine oleate, and sodium dodecyl diphenyl ether disulfonate; the nonionic emulsifier is sorbitan trioleate, sorbitan tristearate (span 65), ethylene glycol fatty acid ester, propylene glycol fatty acid ester, sorbitan monostearate (span 60), sorbitan monooleate (span 80), diethylene glycol fatty acid ester, sorbitan monopalmitate (span 40), polyoxypropylene stearyl fatty acid ester, sorbitan monolaurate (span 20), polyoxyethylene stearyl ester, polyoxyethylene laurate polyoxyethylene ester, polyoxyethylene (4) sorbitan monostearate (Tween 61), polyoxyethylene (5) sorbitan monooleate (Tween 81), polyoxyethylene (20) sorbitan tristearate (Tween 65), polyoxyethylene (20) sorbitan trioleate (Tween 85), polyoxyethylene monooleate, fatty alcohol amine polyoxyethylene ether, One or more of alkylphenol ethoxylates, polyoxyethylene monolaurate, polyoxyethylene castor oil, polyoxyethylene (4) sorbitan monolaurate, namely tween 21, polyoxyethylene (20) sorbitan monostearate, namely tween 60, polyoxyethylene (20) sorbitan monooleate, namely tween 80, polyoxyethylene (20) sorbitan monopalmitate, namely tween 40, polyoxyethylene (20) sorbitan monolaurate, namely tween 20, octylphenol polyoxyethylene (10) ether, octylphenol polyoxyethylene (40) ether and fatty alcohol polyoxyethylene (9) ether.
In the preparation method of the styrene-acrylic emulsion for papermaking, the initiator is any one or more of potassium persulfate, sodium persulfate and ammonium persulfate.
The preparation method of the styrene-acrylic emulsion for papermaking comprises the step of preparing a styrene-acrylic emulsion, wherein the alkaline substance is any one or more of sodium hydroxide, ammonium hydroxide and potassium hydroxide.
The invention also provides the styrene-acrylic emulsion for papermaking prepared by the method, wherein the styrene-acrylic emulsion is used as a binder for papermaking coating.
The styrene-acrylic emulsion for papermaking and the preparation method thereof provided by the invention have the following advantages:
the styrene-acrylic emulsion for papermaking is prepared by copolymerizing an aqueous solution of a mixture of a seed emulsion, a carboxylic acid monomer, a (methyl) acrylate monomer, a (methyl) styrene monomer, siloxane, an anionic emulsifier, a nonionic emulsifier and an initiator through a free radical emulsion.
Compared with the prior art that the reaction kettle is generally used as a reactor, the invention adopts the dynamic tubular reactor for reaction, the reaction efficiency is high, and the obtained styrene-acrylic emulsion has strong binding power and good ink absorption. The styrene-acrylic emulsion in the invention is reacted in a dynamic tubular reactor, so the mixing effect is good, the reaction time is short, the particle size distribution of the obtained styrene-acrylic emulsion is narrow, the molecular weight distribution is narrow, the styrene-acrylic emulsion is applied to papermaking coating and used as an adhesive, and the smoothness of paper is good. Compared with a reaction kettle, the reaction of the dynamic tubular reactor is adopted, the reaction materials are less, and the safety coefficient is high.
A small amount of siloxane is added into the formula of the invention, and the obtained styrene-acrylic emulsion is used as a papermaking coating adhesive, and the smoothness of coated paper is good.
The styrene-acrylic emulsion for papermaking is a high-performance and environment-friendly product which can meet the requirements of papermaking coating. The product is used in papermaking coating, and can obviously improve the smoothness of coated paper.
Detailed Description
The following further describes embodiments of the present invention.
The invention provides a preparation method of styrene-acrylic emulsion for papermaking, which comprises the following steps: weighing the raw materials in proportion, preparing an aqueous solution of a mixture, allowing the aqueous solution to enter a dynamic tubular reactor at a temperature of 80-130 ℃, performing free radical emulsion copolymerization for 5-60 minutes, adjusting the pH of a reaction product to 5-9 with an alkaline substance, and filtering to obtain a styrene-acrylic emulsion for papermaking; each raw material comprises a seed emulsion, a carboxylic acid monomer, a (methyl) acrylate monomer, a (methyl) styrene monomer, siloxane, an anionic emulsifier, a nonionic emulsifier and an initiator.
The tubular reactor is a continuously operated reactor which is tubular and has a large length-diameter ratio. Dynamic refers to the state, performance of the reactor changing with time.
Preferably, the raw materials of the styrene-acrylic emulsion for papermaking comprise the following components in parts by weight: 1-10 parts of seed emulsion, 1-10 parts of carboxylic acid monomer, 50-150 parts of (methyl) acrylate monomer, 100 parts of (methyl) styrene monomer, 0.5-5 parts of siloxane, 0.5-5 parts of anionic emulsifier, 0.2-5 parts of nonionic emulsifier and 0.5-5 parts of initiator.
The seed emulsion is polystyrene seed emulsion with solid content of 20-40 wt% and particle size of 20-50 nm.
The carboxylic acid monomer is any one or more of acrylic acid, methacrylic acid, maleic acid, fumaric acid or itaconic acid.
The (meth) acrylate monomer is methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate or C-methacrylic acid8～C16Any one or more of alkyl esters. More preferred are n-butyl acrylate, methyl methacrylate and 2-ethylhexyl acrylate.
The siloxane is any one or more of N-beta-aminoethyl-gamma-aminopropylmethyldimethoxysilane, gamma-mercaptopropyltrimethoxysilane, N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane and trimethoxysilane.
The anionic emulsifier is C10～C20Sodium alkyl benzene sulfonate, C10～C20Sodium alkylnaphthalenesulfonate, C10～C20Sodium alkyl sulfate, sodium dialkyl-2-sulfosuccinate, sodium dicyclohexyl-2-sulfosuccinate, sodium oleate, and oleic acidAny one or more of potassium, triethanolamine oleate and sodium dodecyl diphenyl ether disulfonate. More preferably sodium lauryl sulfate, sodium dodecylnaphthalene sulfonate, sodium dialkyl-2-sulfosuccinate, and sodium dodecyldiphenyloxide disulfonate.
The nonionic emulsifier is sorbitan trioleate, sorbitan tristearate (span 65), ethylene glycol fatty acid ester, propylene glycol fatty acid ester, sorbitan monostearate (span 60), sorbitan monooleate (span 80), diethylene glycol fatty acid ester, sorbitan monopalmitate (span 40), polyoxypropylene stearyl fatty acid ester, sorbitan monolaurate (span 20), polyoxyethylene stearyl ester, polyoxyethylene laurate polyoxyethylene ester, polyoxyethylene (4) sorbitan monostearate (Tween 61), polyoxyethylene (5) sorbitan monooleate (Tween 81), polyoxyethylene (20) sorbitan tristearate (Tween 65), polyoxyethylene (20) sorbitan trioleate (Tween 85), polyoxyethylene monooleate, fatty alcohol amine polyoxyethylene ether, One or more of alkylphenol ethoxylates, polyoxyethylene monolaurate, polyoxyethylene castor oil, polyoxyethylene (4) sorbitan monolaurate, namely tween 21, polyoxyethylene (20) sorbitan monostearate, namely tween 60, polyoxyethylene (20) sorbitan monooleate, namely tween 80, polyoxyethylene (20) sorbitan monopalmitate, namely tween 40, polyoxyethylene (20) sorbitan monolaurate, namely tween 20, octylphenol polyoxyethylene (10) ether, octylphenol polyoxyethylene (40) ether and fatty alcohol polyoxyethylene (9) ether. More preferably octylphenol polyoxyethylene (10) ether, octylphenol polyoxyethylene (40) ether, fatty alcohol polyoxyethylene (9) ether, polyoxyethylene (20) sorbitan monolaurate, i.e., tween 20.
The initiator is one or more of potassium persulfate, sodium persulfate and ammonium persulfate.
The alkaline substance is any one or more of sodium hydroxide, ammonium hydroxide and potassium hydroxide. More preferably sodium hydroxide, and most preferably an aqueous solution of sodium hydroxide having a mass concentration of 10% to 40%.
The alkaline substance is mainly used for adjusting the pH value of the polymerization reaction product, and the specific amount of the alkaline substance can be adjusted by one skilled in the art according to the actual condition of the reaction product and the application property of the composition of the invention. Preferably, the alkaline substance is used in an amount of 1 to 5 parts.
The amount of water used is not particularly limited and can be adjusted by one skilled in the art according to the dispersive mixing of the components, the sufficiency of the emulsion polymerization and the solid content of the final product. Preferably, the amount of water is 100-475 parts.
The invention also provides the styrene-acrylic emulsion for papermaking prepared by the method, and the styrene-acrylic emulsion is used as a binder for papermaking coating.
The styrene-acrylic emulsion for papermaking and the preparation method thereof provided by the invention are further described in the following by combining with the examples.
The raw materials used in the examples were all conventional commercially available products unless otherwise specified.
Example 1
The styrene-acrylic emulsion for papermaking comprises the following components in parts by weight.
The preparation method of the styrene-acrylic emulsion comprises the following steps.
1)1 g of acrylic acid, 100 g of styrene, 50 g of N-butyl acrylate and 0.5 g of N-beta-aminoethyl-gamma-aminopropylmethyldimethoxysilane are mixed uniformly to prepare an oil phase.
2)1 g of a 40% by weight seed emulsion (particle size 50nm), 0.5 g of sodium lauryl sulfate, 0.2 g of fatty alcohol polyoxyethylene (9) ether, 0.5 g of potassium persulfate and 98.46 g of distilled water were dissolved to form an aqueous phase.
3)1 gram of ammonium hydroxide and 4 grams of distilled water were dissolved into an ammonium hydroxide solution.
4) The oil phase in the step 1) and the water phase in the step 2) are simultaneously used in a dynamic tubular reactor within 60 minutes, the reaction temperature is set to be 80 ℃, and the reaction pressure is set to be 1 MPa.
5) Cooling the emulsion obtained by the reaction of the dynamic tubular reactor to below 40 ℃, neutralizing the emulsion by using the ammonium hydroxide solution obtained in the step 3), and filtering the emulsion by using a 100-mesh screen. Obtaining the required styrene-acrylic emulsion. The solids content was 59.65 wt%, and the pH was 5.28 (measured using a PHS-3C precision pH meter).
Example 2
The styrene-acrylic emulsion for papermaking comprises the following components in parts by weight.
The preparation method of the styrene-acrylic emulsion comprises the following steps.
1)10 g of methacrylic acid, 100 g of 2-ethylhexyl acrylate, 50 g of methyl methacrylate, 95 g of methylstyrene and 5 g of trimethoxysilane are mixed uniformly to prepare an oil phase.
2)10 g of 20% by weight seed emulsion (particle size 20nm), 5 g of sodium dodecylnaphthalenesulfonate, 2 g of sorbitan monolaurate (span 20), 5 g of sodium persulfate and 391 g of distilled water are dissolved into the aqueous phase.
3)6 g of sodium hydroxide and 24 g of distilled water were dissolved to form a sodium hydroxide solution.
4) The oil phase in the step 1) and the water phase in the step 2) were passed through a dynamic tube reactor simultaneously for 5 minutes, with the reaction temperature set at 130 ℃ and the reaction pressure set at 3 MPa.
5) Cooling the emulsion obtained by the reaction of the dynamic tubular reactor to below 40 ℃, neutralizing the emulsion by using the sodium hydroxide solution obtained in the step 3), and filtering the emulsion by using a 100-mesh screen. Obtaining the required styrene-acrylic emulsion. The solids content was 40.34 wt%, and the pH was 8.81 (measured using a PHS-3C precision pH meter).
Example 3
The styrene-acrylic emulsion for papermaking comprises the following components in parts by weight.
The preparation method of the styrene-acrylic emulsion comprises the following steps.
1)5 g of acrylic acid, 15 g of acrylonitrile, 50 g of isobutyl acrylate and 100 g of styrene and 2 g of gamma-mercaptopropyl trimethoxy silane are uniformly mixed to prepare an oil phase.
2)5 g of 30% by weight seed emulsion (particle size 35nm), 2 g of sodium dialkyl-2-sulfosuccinate, 1.5 g of polyoxypropylene stearyl fatty acid ester, 0.5 g of sodium lauryl sulfate, 2.5 g of ammonium persulfate and 172.5 g of distilled water were dissolved into an aqueous phase.
3)3 grams of sodium hydroxide and 7 grams of distilled water were dissolved into a sodium hydroxide solution.
4) The oil phase in the step 1) and the water phase in the step 2) are simultaneously passed through a dynamic tubular reactor within 30 minutes, the reaction temperature is set to be 110 ℃, and the reaction pressure is set to be 2 MPa.
5) Cooling the emulsion obtained by the reaction of the dynamic tubular reactor to below 40 ℃, neutralizing the emulsion by using the sodium hydroxide solution obtained in the step 3), and filtering the emulsion by using a 100-mesh screen. The desired styrene-acrylic emulsion was obtained with a solids content of 50.35 wt.% and a pH of 7.48 (measured using a PHS-3C precision pH meter).
Example 4
The styrene-acrylic emulsion for papermaking comprises the following components in parts by weight.
The preparation method of the styrene-acrylic emulsion comprises the following steps.
1)2 g of acrylic acid, 50 g of 2-ethylhexyl acrylate, 50 g of N-butyl methacrylate, 100 g of methyl styrene and 1 g of N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane were mixed uniformly to prepare an oil phase.
2)8 g of 25% by weight seed emulsion (particle size 40nm), 2 g of sodium butanedioic acid sulfonate, 1.5 g of polyoxyethylene monolaurate, 0.3 g of ammonium persulfate, 1.5 g of sodium persulfate, 2 g of fumaric acid and 220.1 g of distilled water were dissolved into an aqueous phase.
3)4 grams of potassium hydroxide and 36 grams of distilled water were dissolved into a potassium hydroxide solution.
4) The oil phase in step 1) and the water phase in step 2) were passed through a dynamic tube reactor simultaneously over a period of 45 minutes, with a reaction temperature of 95 ℃ and a reaction pressure of 2 MPa.
5) Cooling the emulsion obtained by the reaction of the dynamic tubular reactor to below 40 ℃, neutralizing the emulsion by using the potassium hydroxide solution obtained in the step 3), and filtering the emulsion by using a 100-mesh screen. The desired styrene-acrylic emulsion was obtained with a solids content of 45.48 wt% and a pH of 6.51 (measured using a PHS-3C precision pH meter).
Example 5
The styrene-acrylic emulsion for papermaking comprises the following components in parts by weight.
The preparation method of the styrene-acrylic emulsion comprises the following steps.
1)1 g of acrylic acid, 75 g of ethyl acrylate, 100 g of styrene and 1.5 g of gamma-mercaptopropyl-trimethoxysilane are mixed uniformly to prepare an oil phase.
2)4 g of 35% by weight seed emulsion (particle size 30nm), 4 g of sodium dodecylbenzenesulfonate, 0.8 g of octylphenol polyoxyethylene (40) ether, 1 g of potassium persulfate and 141.8 g of distilled water were dissolved into an aqueous phase.
3)2 grams of sodium hydroxide and 8 grams of distilled water were dissolved into a sodium hydroxide solution.
4) The oil phase in the step 1) and the water phase in the step 2) are simultaneously passed through a dynamic tubular reactor within 15 minutes, the reaction temperature is set to be 120 ℃, and the reaction pressure is set to be 1.5 MPa.
5) Cooling the emulsion obtained by the reaction of the dynamic tubular reactor to below 40 ℃, neutralizing the emulsion by using the sodium hydroxide solution obtained in the step 3), and filtering the emulsion by using a 100-mesh screen. The desired styrene-acrylic emulsion was obtained with a solids content of 54.31 wt% and a pH of 7.98 (measured using a PHS-3C precision pH meter).
Comparative example
The styrene-acrylic emulsion is prepared according to the method disclosed in Chinese patent CN 107556418A.
The styrene-acrylic emulsions prepared in examples 1 to 5 and comparative examples were used to prepare coatings according to the formulation in table 1 below.
Table 1 coating formulation table.
| Component name | Specification and model | Parts by mass |
| Water (W) | Deionization | 32.4 |
| Ground calcium carbonate | 2.0μm≥95％ | 90 |
| Kaolin clay | Brazil rubber | 10 |
| Polyacrylamide sodium salt | 42％ | 0.35 |
| Paint subtotal | / | 132.65 |
Adding the obtained components into a high-speed dispersion machine, uniformly stirring, dispersing at a high speed for 20-30 min until the fineness is qualified, adding the components in the following table 2 at a low speed, uniformly stirring, discharging, and filtering.
Table 2. coating finished product formulation table.
Coating materials prepared by using the emulsions prepared in examples 1-5 and comparative example 1 were coated with No. 10 coating rod at 130g/m2Coating on the copperplate base paper with the coating weight of 10g/m2And then standby.
The coated paper was tested using a smoothness tester.
And (3) judging standard: the greater the smoothness, the better the effect of the styrene-acrylic emulsion in the coating.
The results are shown in table 3 below.
Table 3 table of measurement results.
| Sample (I) | Smoothness/s |
| Example 1 | 340 |
| Example 2 | 350 |
| Example 3 | 325 |
| Example 4 | 367 |
| Example 5 | 342 |
| Comparative example | 255 |
From the above test results it can be seen that: compared with a comparative example, the styrene-acrylic emulsion prepared in the embodiment 1-5 is applied to papermaking coating, and the obtained paper has excellent smoothness performance.
The invention provides a styrene-acrylic emulsion for papermaking and a preparation method thereof, which is prepared by copolymerizing an aqueous solution of a mixture of a seed emulsion, a carboxylic acid monomer, a (methyl) acrylate monomer, a (methyl) styrene monomer, siloxane, an anionic emulsifier, a nonionic emulsifier and an initiator through a free radical emulsion. The invention carries out emulsion polymerization by using the dynamic tubular reactor, and compared with the kettle type reaction, the tubular reactor has the advantages of high reaction speed, high production efficiency and high safety factor. And a tubular reactor is adopted in the synthesis of the styrene-acrylic emulsion, and compared with a kettle type reaction, the obtained styrene-acrylic emulsion has higher smoothness when being used for paper in a papermaking coating.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. The preparation method of the styrene-acrylic emulsion for papermaking is characterized by comprising the following steps: weighing the raw materials in proportion, preparing an aqueous solution of a mixture, allowing the aqueous solution to enter a dynamic tubular reactor at a temperature of 80-130 ℃, performing free radical emulsion copolymerization for 5-60 minutes, adjusting the pH of a reaction product to 5-9 with an alkaline substance, and filtering to obtain a styrene-acrylic emulsion for papermaking; each raw material comprises a seed emulsion, a carboxylic acid monomer, a methacrylate monomer, a methyl styrene monomer, siloxane, an anionic emulsifier, a nonionic emulsifier and an initiator.
2. The method for preparing the styrene-acrylic emulsion for papermaking according to claim 1, wherein the styrene-acrylic emulsion comprises the following raw materials in parts by weight: 1-10 parts of seed emulsion, 1-10 parts of carboxylic acid monomer, 50-150 parts of methacrylate monomer, 100 parts of methyl styrene monomer, 0.5-5 parts of siloxane, 0.5-5 parts of anionic emulsifier, 0.2-5 parts of nonionic emulsifier and 0.5-5 parts of initiator.
3. The method for preparing styrene-acrylic emulsion for papermaking according to claim 2, wherein the seed emulsion is polystyrene seed emulsion having a solid content of 20-40% by weight and a particle size of 20-50 nm.
4. The method for preparing a styrene-acrylic emulsion for papermaking according to claim 2, wherein the carboxylic acid monomer is any one or more of acrylic acid, methacrylic acid, maleic acid, fumaric acid and itaconic acid.
5. The method of preparing a styrene-acrylic emulsion for papermaking according to claim 2, wherein the methacrylate monomer is methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, 2-ethylhexyl methacrylate or C-methacrylic acid8～C16Any one or more of alkyl esters.
6. The method of preparing a styrene-acrylic emulsion for papermaking according to claim 2, wherein the siloxane is any one or more of N- β -aminoethyl- γ -aminopropylmethyldimethoxysilane, γ -mercaptopropyltrimethoxysilane, N- (β -aminoethyl) - γ -aminopropyltriethoxysilane, and trimethoxysilane.
7. The method for preparing styrene-acrylic emulsion for papermaking as claimed in claim 2, wherein the anionic emulsifier is C10～C20Sodium alkyl benzene sulfonate, C10～C20Sodium alkylnaphthalenesulfonate, C10～C20Any one or more of sodium alkyl sulfate, sodium dialkyl-2-sulfosuccinate, sodium dicyclohexyl-2-sulfosuccinate, sodium oleate, potassium oleate, triethanolamine oleate, and sodium dodecyl diphenyl ether disulfonate; the nonionic emulsifier is sorbitan trioleate, sorbitan tristearate (span 65), ethylene glycol fatty acid ester, propylene glycol fatty acid ester, sorbitan monostearate (span 60), sorbitan monooleate (span 80), diethylene glycol fatty acid ester, sorbitan monopalmitate (span 40), polyoxypropylene stearyl fatty acid ester, sorbitan monolaurate (span 20), polyoxyethylene stearyl ester, polyoxyethylene laurate polyoxyethylene ester, polyoxyethylene (4) sorbitan monostearate (Tween 61), polyoxyethylene (5) sorbitan monooleate (Tween 81), polyoxyethylene (20) sorbitan tristearate (Tween 65), polyoxyethylene (20) sorbitan trioleate (Tween 85), polyoxyethylene monooleate, fatty alcohol amine polyoxyethylene ether, Alkylphenol ethoxylates, polyoxyethylene monolaurate, polyoxyethylene castor oil, polyoxyethylene (4) sorbitan monolaurate (Tween 21), polyoxyethylene (20) sorbitan monostearate (Tween 60), polyoxyethylene (20) sorbitan monooleate (Tween 80), polyoxyethylene (20) sorbitan monopalmitate (Tween 40), polyoxyethylene (20) sorbitan monolaurate (Tween 20), and octylphenol polyoxylAny one or more of ethylene (10) ether, octylphenol polyoxyethylene (40) ether and fatty alcohol polyoxyethylene (9) ether.
8. The method for preparing styrene-acrylic emulsion for papermaking according to claim 2, wherein the initiator is any one or more of potassium persulfate, sodium persulfate and ammonium persulfate.
9. The method for preparing a styrene-acrylic emulsion for papermaking according to claim 2, wherein the alkaline substance is any one or more of sodium hydroxide, ammonium hydroxide and potassium hydroxide.
10. The styrene-acrylic emulsion for papermaking prepared by the method according to any one of claims 1 to 9, wherein the styrene-acrylic emulsion is used as a binder for papermaking coating.
Priority Applications (1)
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|---|---|---|---|---|
| CN101812152A (en) * | 2010-03-31 | 2010-08-25 | 上海东升新材料有限公司 | Fine partical size styrene-acrylic latex for coated paper under-coating paint and preparation method and application thereof |
| CN109293814A (en) * | 2017-07-25 | 2019-02-01 | 济宁明升新材料有限公司 | A kind of preparation method of the styrene-butadiene latex for papermaking paint |
| CN110407679A (en) * | 2019-08-06 | 2019-11-05 | 山东豪迈化工技术有限公司 | A method of preparing 2,3 dichloro benzaldehyde |
| CN111019035A (en) * | 2019-11-20 | 2020-04-17 | 上海东升新材料有限公司 | Styrene-butadiene latex for surface coating and preparation method and application thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812152A (en) * | 2010-03-31 | 2010-08-25 | 上海东升新材料有限公司 | Fine partical size styrene-acrylic latex for coated paper under-coating paint and preparation method and application thereof |
| CN109293814A (en) * | 2017-07-25 | 2019-02-01 | 济宁明升新材料有限公司 | A kind of preparation method of the styrene-butadiene latex for papermaking paint |
| CN110407679A (en) * | 2019-08-06 | 2019-11-05 | 山东豪迈化工技术有限公司 | A method of preparing 2,3 dichloro benzaldehyde |
| CN111019035A (en) * | 2019-11-20 | 2020-04-17 | 上海东升新材料有限公司 | Styrene-butadiene latex for surface coating and preparation method and application thereof |
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