CN112979862A - Styrene-acrylic emulsion and preparation method thereof - Google Patents
Styrene-acrylic emulsion and preparation method thereof Download PDFInfo
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- CN112979862A CN112979862A CN202110338185.7A CN202110338185A CN112979862A CN 112979862 A CN112979862 A CN 112979862A CN 202110338185 A CN202110338185 A CN 202110338185A CN 112979862 A CN112979862 A CN 112979862A
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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
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
Abstract
The invention provides a styrene-acrylic emulsion and a preparation method thereof, wherein the styrene-acrylic emulsion comprises the following components: acrylate monomer, styrene and special monomer; the method comprises the following steps: the method comprises the following steps: fully stirring and mixing an emulsifier and water for 15-30 minutes, adding an acrylate monomer, styrene and a special monomer, stirring and emulsifying for 30-60 minutes to obtain an emulsion; step two: preparing materials in a reaction kettle, uniformly stirring an emulsifier and water, adding part of the emulsion prepared in the step one, dropwise adding part of an initiator solution and a reducing agent solution, and reacting for 7-15 minutes to prepare a seed emulsion; step three: dropwise adding the emulsion, the initiator and the reducing agent solution which are remained in the step one for 2-3 hours; step four: after the dripping step of the third step is finished, carrying out heat preservation reaction for 1-2 hours, carrying out post elimination under the temperature control of 60-70 ℃, and carrying out heat preservation reaction for 1 hour after the post elimination is finished; step five: and after the fourth step is finished, cooling to below 40 ℃, filtering and discharging to obtain a finished thickener product.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to a styrene-acrylic emulsion and a preparation method thereof.
Background
In the coating industry, along with the enhancement of environmental awareness of people and the limitation of environmental regulations on organic volatile solvents, water dispersion systems or water-based coatings are replacing traditional coatings and paints taking organic solvents as disperse phases in more and more fields, the water-based coatings have unique performance requirements on emulsion selection in the systems in stages of storage, construction and the like, the unique requirements can be met by adding proper emulsions, the emulsion paints can obtain good performance after the emulsions are added, the high-performance acrylic emulsions can improve the comprehensive performance of the water-based coatings, and the high-performance acrylic emulsions can also be clean and environment-friendly, and ensure the safety and the construction convenience in the using process.
The acrylate emulsion has the characteristics of easy control of self viscosity, environmental protection, easy dispersion in the coating, good stability, good antibacterial property and the like, and is widely used for water-based coatings. At present, the preparation methods of the acrylate emulsion include solution polymerization, precipitation polymerization, inverse emulsion polymerization, emulsion polymerization and the like. Emulsion polymerization takes water as a dispersion medium, does not pollute the environment, can avoid the environmental pollution problems of high cost, poor storage stability, solvent removal and the like caused by using an organic dispersion medium, and has become a main synthesis method of an acrylate thickener.
Thickeners, also known as rheological aids, are known to increase the viscosity of the coating system, which is also known as rheological properties. The auxiliary agent with insufficient viscosity is easy to flow and shows a sagging phenomenon on a three-dimensional surface, and the higher the viscosity is, the more difficult the sagging occurs, so that the thickening agent can solve the rheological problem.
However, most products on the market are difficult to combine in terms of keeping the integration of all aspects and keeping the low cost due to the dispersion effect of the powder and the formation of the macromolecular state, and because the content of the resin is controlled to be the lowest as possible in order to reduce the cost, the performance requirement of the resin is higher, the spatial structure, the monomer composition, the molecular weight and the like of the resin need to be better controlled to ensure that the performance of the paint film is improved under the condition of the lowest cost, but the ideal great improvement of the elasticity and the tensile strength of the resin still has some challenges.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the styrene-acrylic emulsion and the preparation method thereof, which not only can lower the cost, but also can greatly improve the elasticity and tensile strength of resin and optimize the leveling property of the styrene-acrylic emulsion under the comprehensive condition of keeping all aspects.
The invention provides a styrene-acrylic emulsion, which comprises the following components:
an acrylate monomer;
styrene;
a specific monomer.
According to one technical scheme, the styrene-acrylic emulsion further comprises an initiator.
According to the technical scheme, the method is further set to ensure that the using amount of the initiator is 0.12-0.7% of the monomer amount.
According to one technical scheme, the initiator is one or a combination of sodium persulfate, ammonium persulfate and potassium persulfate.
According to the technical scheme, the amount of the initiator is 0.10% -0.6% of the amount of the monomer, and the initiator is the combination of any two of sodium persulfate, ammonium persulfate and potassium persulfate.
According to one technical scheme, the styrene-acrylic emulsion further comprises 3.0-6.0% of emulsifier.
According to one technical scheme, the special monomer is one or a combination of a plurality of macromolecular acrylic acid functional monomers, hydroxyethyl acrylate and acrylonitrile, and accounts for 10-20% of the total amount of the monomer.
According to one technical scheme, the styrene-acrylic emulsion further comprises a reducing agent, and the reducing agent is mixed with the initiator to generate an initiating solution.
According to one technical scheme, the method is further provided that an oxidant used in the post-elimination process of the styrene-acrylic emulsion is tert-butyl hydroperoxide, and a reducing agent is FF 6M.
The invention also provides a preparation method of the styrene-acrylic emulsion, which is used for preparing the styrene-acrylic emulsion in any technical scheme and is characterized by comprising the following steps:
the method comprises the following steps: fully stirring and mixing an emulsifier and water for 15-30 minutes, adding an acrylate monomer, styrene and a special monomer, stirring and emulsifying for 30-60 minutes to obtain an emulsion;
step two: preparing materials in a reaction kettle, uniformly stirring an emulsifier and water, adding part of the emulsion prepared in the step one, dropwise adding part of an initiator solution and a reducing agent solution, and reacting for 7-15 minutes to prepare a seed emulsion;
step three: dropwise adding the emulsion, the initiator and the reducing agent solution which are remained in the step one for 2-3 hours;
step four: after the dripping step of the third step is finished, carrying out heat preservation reaction for 1-2 hours, carrying out post elimination under the temperature control of 60-70 ℃, and carrying out heat preservation reaction for 1 hour after the post elimination is finished;
step five: and after the fourth step is finished, cooling to below 40 ℃, filtering and discharging to obtain a styrene-acrylic emulsion finished product.
The invention has the beneficial effects that:
(1) the acrylate has active double bonds and is easy to self-polymerize or copolymerize with other monomers. Acrylate is a monomer for manufacturing adhesives, synthetic resins, special rubbers and plastics. The styrene chain segment is introduced into the acrylate monomer, so that the water resistance, alkali resistance, hardness, dirt resistance and chalking resistance of the coating are greatly improved, and the prepared styrene-acrylic emulsion has the advantages of acrylate polymers: good light resistance, weather resistance, alkali resistance, water resistance, wet washing resistance, fine appearance, strong adhesive force and good film forming property. The acrylate monomer and special monomer (such as acrylonitrile) can also be polymerized to generate polymer, and in addition, SAN prepared by copolymerizing styrene and acrylonitrile in the components is impact-resistant and bright-colored resin and is an important component for preparing building material emulsion. Compared with the traditional emulsion, a small amount of functional monomer is introduced by blending or copolymerization to realize the modification of the styrene-acrylic emulsion and endow the styrene-acrylic emulsion with more excellent leveling property.
(2) The initiator can directly influence whether the polymerization reaction process can be smoothly carried out or not and influence the polymerization reaction rate, and the initiator is added into the styrene-acrylic emulsion, so that the polymerization reaction of acrylate monomers, styrene and special monomers can be promoted, and the polymerization efficiency is higher.
(3) The initiator is required to be used in a proper amount, and the amount of the initiator is not too large or too small, and the reaction speed is too high and difficult to control if the amount of the initiator is too large or too small; if the amount of the catalyst is small, the catalyst is not easy to initiate, the reaction can not be normally carried out, and the performance of the polymer is influenced. The dosage of the initiator is controlled to be 0.12-0.7 percent of the monomer amount, so that the reaction speed can be controlled to be moderate, the normal reaction can be ensured, and the performance of the polymer is not influenced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
The conjunction "consisting of …" excludes any unspecified elements, steps or components. If used in a claim, the phrase is intended to claim as closed, meaning that it does not contain materials other than those described, except for the conventional impurities associated therewith. When the phrase "consisting of …" appears in a clause of the subject matter of the claims rather than immediately after the subject matter, it defines only the elements described in the clause; other elements are not excluded from the claims as a whole.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4," "1 to 3," "1-2 and 4-5," "1-3 and 5," and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
Unless otherwise indicated, temperatures herein are expressed in degrees Celsius, all polymer molecular weights are in number average molecular weight, and the number average molecular weight is measured by steam pressure.
All starting materials are commercially available and the parts are parts by weight, unless otherwise indicated.
The invention provides a styrene-acrylic emulsion, which comprises the following components:
an acrylate monomer;
styrene;
a specific monomer.
The acrylate has active double bonds and is easy to self-polymerize or copolymerize with other monomers. Acrylate is a monomer for manufacturing adhesives, synthetic resins, special rubbers and plastics. The styrene chain segment is introduced into the acrylate monomer, so that the water resistance, alkali resistance, hardness, dirt resistance and chalking resistance of the coating are greatly improved, and the prepared styrene-acrylic emulsion has the advantages of acrylate polymers: good light resistance, weather resistance, alkali resistance, water resistance, wet washing resistance, fine appearance, strong adhesive force and good film forming property. The acrylate monomer and special monomer (such as acrylonitrile) can also be polymerized to generate polymer, and in addition, SAN prepared by copolymerizing styrene and acrylonitrile in the components is impact-resistant and bright-colored resin and is an important component for preparing building material emulsion. Compared with the traditional emulsion, a small amount of functional monomer is introduced by blending or copolymerization to realize the modification of the styrene-acrylic emulsion and endow the styrene-acrylic emulsion with more excellent leveling property.
Specifically, the acrylate monomers in the styrene-acrylic emulsion comprise, by weight, 30-50 parts of one of acrylic acid, methacrylic acid, itaconic acid and maleic acid, and 50-70 parts of one or two of ethyl acrylate, acrylamide, styrene, butyl acrylate, isooctyl acrylate and methyl methacrylate.
Preferably, the styrene-acrylic emulsion further comprises an initiator.
The initiator can directly influence whether the polymerization reaction process can be smoothly carried out or not and influence the polymerization reaction rate, and the initiator is added into the styrene-acrylic emulsion, so that the polymerization reaction of acrylate monomers, styrene and special monomers can be promoted, and the polymerization efficiency is higher.
Preferably, the amount of initiator is 0.12% to 0.7% of the amount of monomer.
The initiator is required to be used in a proper amount, and the amount of the initiator is not too large or too small, and the reaction speed is too high and difficult to control if the amount of the initiator is too large or too small; if the amount of the catalyst is small, the catalyst is not easy to initiate, the reaction can not be normally carried out, and the performance of the polymer is influenced. The dosage of the initiator is controlled to be 0.12-0.7 percent of the monomer amount, so that the reaction speed can be controlled to be moderate, the normal reaction can be ensured, and the performance of the polymer is not influenced.
Preferably, the initiator is one or more of sodium persulfate, ammonium persulfate and potassium persulfate.
The initiation effect of sodium persulfate, ammonium persulfate, potassium persulfate is equivalent, all can regard as emulsion polymerization's initiator, and sodium persulfate is with low costs among the three, and the initiation effect of potassium persulfate is better than sodium persulfate and ammonium persulfate. The half-life period of ammonium persulfate at 80 ℃ is 2.1 hours, the half-life period of potassium persulfate is 1.5 hours, and the half-life period of sodium persulfate is shorter than that of the former two, so that when the initiator is dripped into the emulsion, the temperature is optimally controlled to be 60-70 ℃, the dripping time is 2-3 hours, the initiator is prevented from having good initiating effect even at the half-life period when the temperature is more than 80 ℃, and the polymerization of each component of the emulsion is not facilitated; in addition, the dissolution rate of ammonium persulfate and sodium persulfate in water is very fast, potassium persulfate is very slow, and the stirring is relatively long, the initiation effect of potassium persulfate is better, and sodium persulfate is poorer in initiation effect relatively, but the price is low, so when selecting an initiator, the cost and the initiation time can be combined, the reaction temperature is flexibly considered, and the styrene-acrylic emulsion is prepared in the industrial production process only by selecting the sodium persulfate.
Preferably, the amount of the initiator is 0.10-0.6% of the amount of the monomer, and the initiator is a combination of any two of sodium persulfate, ammonium persulfate and potassium persulfate.
The initiator is used as an accelerator and an oxidant for emulsion polymerization, more than two initiators are compounded, the half-life period of the initiator can be adjusted, the using amount of the initiator can be reduced, a better initiation effect is obtained, and the compounded initiator is added into a styrene-acrylic emulsion preparation, so that the leveling property of the obtained finished product is improved.
Preferably, the styrene-acrylic emulsion also comprises 3.0-6.0% of emulsifier.
The emulsifier enables each monomer to be uniformly dispersed in water to form emulsion in the process of aqueous acrylic emulsion polymerization, and plays an important role in the particle size of a polymer in the process of emulsion polymerization. The emulsifier is added into a mixed solvent of the acrylate monomer, the styrene and the special monomer, the emulsifier enables the acrylate monomer, the styrene and the special monomer to be respectively and uniformly dispersed in water to form emulsion, each component is subjected to polymerization reaction to generate polymer, the particle size of each polymer is changed under the action of the emulsifier, the emulsifier enables the cohesion of the polymer generated by the polymerization reaction to be increased, the toughness is enhanced, the leveling property of the generated emulsion is guaranteed, and meanwhile, the sagging property is also guaranteed.
Wherein the emulsifier is an anionic emulsifier and is one or a mixture of two of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, ethoxylated sodium alkyl sulfate, sodium alkyl ether sulfate and sodium fatty alcohol ether sulfate.
Preferably, the special monomer is one or more of macromolecule acrylic acid functional monomer, hydroxyethyl acrylate and acrylonitrile, and the special monomer accounts for 10-20% of the total monomer.
The copolymer of special monomer and acrylic ester monomer is used as thickening agent, for example, the copolymer produced by acrylamide of acrylic ester monomer and hydroxyethyl acrylate of special monomer is used as thickening agent, the use amount of hydroxyethyl acrylate is small, but the product performance can be obviously improved, said product can be copolymerized with acrylonitrile monomer, and can be used for producing coating material with excellent performance, and can be copolymerized with vinyl monomer, for example, styrene so as to improve its adhesive strength.
Preferably, the styrene-acrylic emulsion further comprises a reducing agent, and the reducing agent is mixed with the initiator to generate an initiating solution. Wherein the reducing agent is one of sodium bisulfite and sodium metabisulfite.
When the initiator is used as an oxidant to mix the components, the oxidation reaction among the components is promoted, in order to keep the smooth preparation of the styrene-acrylic emulsion, the reducing agent is required to be used as the antioxidant to promote the reduction reaction among the components, and the generation of the styrene-acrylic emulsion with excellent leveling property is ensured by an initiating solution prepared by mixing the reducing agent and the initiator in a proper proportion.
Preferably, the oxidizing agent used in the post-elimination process of the styrene-acrylic emulsion is tert-butyl hydroperoxide and the reducing agent is FF 6M.
The tert-butyl hydroperoxide is mainly used as an initiator of polymerization reaction (elimination after monomer polymerization), has good initiation performance, FF6M does not contain formaldehyde and does not generate formaldehyde in the reaction process, FF6M reacts with a proper oxidant, the conversion rate of an oxidation system can be more than 99.9 percent, almost no residual monomer exists in the system after the elimination, and the polymerization reaction effect is good.
The invention also provides a preparation method of the styrene-acrylic emulsion, which is used for preparing the styrene-acrylic emulsion in the scheme and is characterized in that the preparation method comprises the following steps:
the method comprises the following steps: fully stirring and mixing an emulsifier and water for 15-30 minutes, adding an acrylate monomer, styrene and a special monomer, stirring and emulsifying for 30-60 minutes to obtain an emulsion;
step two: preparing materials in a reaction kettle, uniformly stirring an emulsifier and water, adding part of the emulsion prepared in the step one, dropwise adding part of an initiator solution and a reducing agent solution, and reacting for 7-15 minutes to prepare a seed emulsion;
step three: dropwise adding the emulsion, the initiator and the reducing agent solution which are remained in the step one for 2-3 hours;
step four: after the dripping step of the third step is finished, carrying out heat preservation reaction for 1-2 hours, carrying out post elimination under the temperature control of 60-70 ℃, and carrying out heat preservation reaction for 1 hour after the post elimination is finished;
step five: and after the fourth step, cooling to below 40 ℃, filtering and discharging to obtain a styrene-acrylic emulsion finished product.
In the second step, the step of dropping part of the initiator and the reducing agent solution specifically means that the corresponding reducing agent and the initiator are synchronously dropped, and when the reaction temperature is low, the reducing agent is used, so that the initiation efficiency is improved, and the activation energy is reduced, thereby ensuring that the initiator can initiate polymerization normally.
The invention selects the environment-friendly emulsifier, the special association monomer and the cross-linking agent of which the acrylate monomer at least contains two unsaturated double bonds, and is obtained by polymerization through a special emulsion process, and the product is environment-friendly. Compared with most products in the market, the elastic acrylic emulsion prepared by the invention has the advantages that the dispersion effect on powder is improved and the macromolecular state is formed, so that the cost is lower, and the elasticity and the tensile strength of the resin can be greatly improved under the comprehensive condition of keeping all aspects. The invention adds acrylamide and acrylonitrile to increase the cohesive force of the polymer and ensure that the polymer has enough toughness to achieve better elastic emulsion effect; special monomers are polymerized on the main chain of the thickener polymer, so that the tail end of a macromolecular functional monomer can be wound on a resin chain segment, the cohesion of the polymer is further improved, and the synchronous improvement of the strength and the elongation rate is ensured in an elastic emulsion system; and the polymerization at a lower temperature can ensure that the active hydrogen can be fully polymerized to the polymerization end of the molecule without closing the end prematurely, so as to ensure that the resin is fully subjected to linear polymerization, thereby providing good help for the resin to achieve an excellent toughness effect.
The present invention will be further described with reference to the following examples.
Examples
a) Preparing an emulsion, weighing 240g of deionized water and 10g of emulsifier LA-40S, stirring for 15 minutes, adding 2.4g of methacrylic acid, 220.9g of ethyl acrylate, 120g of styrene, 126.7g of isooctyl acrylate, 10g of acrylamide, 5g of acrylonitrile, 20.8g of long-chain acrylic monomer and 4g of methyl methacrylate, and stirring for 30 minutes to obtain the pre-emulsion.
b) The bottom material was prepared by weighing 200g of deionized water, 5g of anionic and nonionic emulsifier mixture (K12, etc.) and stirring for 10 minutes.
c) And when the temperature in the kettle rises to 70 ℃, adding 5 percent of pre-emulsion into the kettle, adding 5g of ammonium persulfate solution (5g of water is used for dissolving 0.25g of ammonium persulfate) and beginning to dropwise add 2g of sodium metabisulfite (30 g of water is used for dissolving 0.25g of ammonium persulfate), and reacting for 10 minutes.
d) The remaining emulsion and 70g of an ammonium persulfate solution (0.4 g of ammonium persulfate dissolved in 70g of water) were added dropwise over 2 hours with the reaction temperature being controlled at 72 ℃.
e) After the completion of the dropwise addition, the reaction was allowed to proceed for 1 hour under heat preservation, and at 72 ℃ an aqueous solution of t-butyl hydroperoxide (5g of water dissolved in 0.18g of t-butyl hydroperoxide) was added, and at an interval of 10 minutes, an aqueous solution of FF6M (10g of water dissolved in 0.09g of FF6M) was added, and the heat preservation was completed for 1 hour.
f) After the heat preservation is finished, the temperature is reduced to be below 40 ℃, and the elastic acrylic emulsion finished product is obtained by filtering and discharging through 200-mesh filter cloth, wherein the solid content is 50 +/-1%, the pH value is 7.0-9.0, and the viscosity is 1000 mPa.s.
The pH of the styrene-acrylic emulsion prepared in this example was adjusted with ammonia; the strength elongation and other performances of the acrylic elastic resin in an elastic formula are tested, the strength can reach 2.5MPA and the elongation of 500 percent in a single-component elastic formula with the emulsion content of 40 percent, the acrylic elastic resin has unique performance effect, and still has high performance retention rate in other tests of acid resistance, alkali resistance and the like.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show the individual embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The styrene-acrylic emulsion is characterized by comprising the following components:
an acrylate monomer;
styrene;
a specific monomer.
2. The styrene acrylic emulsion according to claim 1, wherein the styrene acrylic emulsion further comprises an initiator.
3. The styrene acrylic emulsion according to claim 2 wherein the amount of said initiator is 0.12% to 0.7% of the amount of monomer.
4. The styrene acrylic emulsion according to claim 3 wherein the initiator is a combination of one or more of sodium persulfate, ammonium persulfate, and potassium persulfate.
5. The styrene-acrylic emulsion according to claim 4, wherein the amount of the initiator is 0.10-0.6% of the amount of the monomer, and the initiator is a combination of any two of sodium persulfate, ammonium persulfate and potassium persulfate.
6. The styrene acrylic emulsion according to claim 5, wherein the styrene acrylic emulsion further comprises 3.0 to 6.0% of an emulsifier.
7. The styrene-acrylic emulsion according to claim 6, wherein the special monomer is one or more of macro-acrylic functional monomer, hydroxyethyl acrylate and acrylonitrile, and the special monomer accounts for 10-20% of the total monomer.
8. The styrene acrylic emulsion according to claim 7, further comprising a reducing agent, wherein the reducing agent is mixed with the initiator to produce an initiating solution.
9. The styrene-acrylic emulsion according to claim 8, wherein the oxidizing agent used in the post elimination process of the styrene-acrylic emulsion is t-butyl hydroperoxide and the reducing agent is FF 6M.
10. A method for preparing a styrene-acrylic emulsion according to claim 9, which comprises the following steps:
the method comprises the following steps: fully stirring and mixing an emulsifier and water for 15-30 minutes, adding an acrylate monomer, styrene and a special monomer, stirring and emulsifying for 30-60 minutes to obtain an emulsion;
step two: preparing materials in a reaction kettle, uniformly stirring an emulsifier and water, adding part of the emulsion prepared in the step one, dropwise adding part of an initiator solution and a reducing agent solution, and reacting for 7-15 minutes to prepare a seed emulsion;
step three: dropwise adding the emulsion, the initiator and the reducing agent solution which are remained in the step one for 2-3 hours;
step four: after the dripping step of the third step is finished, carrying out heat preservation reaction for 1-2 hours, carrying out post elimination under the temperature control of 60-70 ℃, and carrying out heat preservation reaction for 1 hour after the post elimination is finished;
step five: and after the fourth step is finished, cooling to below 40 ℃, filtering and discharging to obtain a styrene-acrylic emulsion finished product.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116463012A (en) * | 2023-03-31 | 2023-07-21 | 大连亿锦节能设备有限公司 | Nano modified special anticorrosive paint |
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| CN102585072A (en) * | 2012-01-11 | 2012-07-18 | 南京瑞固聚合物有限公司 | Room temperature self-crosslinking acrylic ester emulsion |
| CN112266439A (en) * | 2020-09-23 | 2021-01-26 | 泰州东方特种化工有限公司 | Ammonia-free waterproof emulsion and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5385967A (en) * | 1992-06-16 | 1995-01-31 | Basf Aktiengesellschaft | Use of aqueous dispersions as heat-seal adhesives |
| CN102585072A (en) * | 2012-01-11 | 2012-07-18 | 南京瑞固聚合物有限公司 | Room temperature self-crosslinking acrylic ester emulsion |
| CN112266439A (en) * | 2020-09-23 | 2021-01-26 | 泰州东方特种化工有限公司 | Ammonia-free waterproof emulsion and preparation method thereof |
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| CN116463012A (en) * | 2023-03-31 | 2023-07-21 | 大连亿锦节能设备有限公司 | Nano modified special anticorrosive paint |
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