CN113321442A - Method for preparing redispersible latex powder by taking modified silicone-acrylic emulsion as raw material - Google Patents

Method for preparing redispersible latex powder by taking modified silicone-acrylic emulsion as raw material Download PDF

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CN113321442A
CN113321442A CN202110783447.0A CN202110783447A CN113321442A CN 113321442 A CN113321442 A CN 113321442A CN 202110783447 A CN202110783447 A CN 202110783447A CN 113321442 A CN113321442 A CN 113321442A
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agent
modified silicone
latex powder
preparing
redispersible latex
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杜洪雨
王辉
王斌
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Guangzhou Jiantubao Building Materials Co ltd
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Guangzhou Jiantubao Building Materials Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C04B24/42—Organo-silicon compounds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0042—Powdery mixtures
    • 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
    • C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
    • 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
    • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
    • 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
    • C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
    • C08F222/02—Acids; Metal salts or ammonium salts thereof, e.g. maleic acid or itaconic acid
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0045—Polymers chosen for their physico-chemical characteristics
    • C04B2103/0057—Polymers chosen for their physico-chemical characteristics added as redispersable powders

Abstract

The invention belongs to the technical field of chemical synthesis in building materials, and particularly discloses a method for preparing redispersible latex powder by taking modified silicone-acrylate emulsion as a raw material, which comprises the steps of mixing an organosilicon monomer with an unsaturated bond and an acrylic monomer with an auxiliary agent, synthesizing the silicone-acrylate emulsion by a core-shell wrapping modification polymerization process, and preparing the redispersible latex powder by taking the silicone-acrylate emulsion as a base and performing spray drying The paint has the advantages of ultraviolet resistance, yellowing resistance, stain resistance, self-cleaning property, more excellent surface in building materials and wide application prospect.

Description

Method for preparing redispersible latex powder by taking modified silicone-acrylic emulsion as raw material
Technical Field
The invention belongs to the technical field of chemical synthesis in building materials, and particularly relates to a method for preparing redispersible latex powder by using modified silicone-acrylic emulsion as a raw material.
Background
With the development of chemical synthesis process and building materials, the application of special powder high molecular polymer is more and more extensive, and the high molecular polymer redispersible latex powder is needed in aspects related to national life, such as building mortar, cement concrete and building coating. The common redispersible latex powder is applied to cement mortar and paint, and can improve the cohesive force and cohesion of materials, improve the flexibility of the materials, improve the deformation capacity and the like. The production technology of four common redispersible latex powders on the market, such as vinyl acetate and ethylene copolymerized (VAE rubber powder), styrene and acrylic acid copolymerized (styrene-acrylic rubber powder), butyl acrylate copolymerized (styrene-butadiene rubber powder) and acrylate copolymerized (pure acrylic rubber powder), is mature, but the four polymers have the defects and shortcomings of performance. The VAE rubber powder has poor water resistance, is easy to hydrolyze in a humid environment, and has sharply reduced performance in a high-temperature or freeze-thaw environment. The three types of redispersible emulsion powder of styrene-butadiene rubber powder, styrene-acrylic rubber powder and pure acrylic rubber powder are limited by domestic production technology and foreign patents, core products and technologies are mastered in foreign enterprises, and the three types of emulsion powder have the problems of large brittleness, poor flexibility, poor deformation resistance, difficulty in resisting cement shrinkage, large water resistance and impermeability loss caused by large water absorption and the like, and are limited in market application. With the development of building industrialization and standardization, the demand for special mortars with special purposes, such as caulking mortar, joint mortar, sleeve grouting, pavement and dam spillway repair mortar, clear water mortar and the like, is increasingly high, the corresponding performance index needing high polymer is higher, the preparation and production process of the silicone-acrylic redispersible latex powder is not seen in patents and documents, and the silicone-acrylic redispersible latex powder disclosed by the invention has market advantages and also has great innovation and technical initiative advantages. The silicone-acrylate emulsion introduces an organosilicon monomer, so that the acrylic emulsion not only retains excellent film forming property, mechanical property and the like of the acrylic emulsion, but also has firm structure because the Si-O bond energy is far greater than C-C and C-O bonds, so that the acrylic emulsion has strong heat resistance, weather resistance, corrosion resistance and oxidation resistance, and simultaneously has self-cleaning property because the product has large molecular volume, low polarity and small solubility and is difficult to absorb water, so that the product has extremely strong hydrophobic and water repellent property, the adhesion of dust and pollutants to the surface of a material is reduced, and the performance requirement of the product in a harsh environment is met. Silicone-acrylic emulsion on the market is common, and if the common silicone-acrylic emulsion is directly sprayed and dried like EVA rubber powder, agglomeration is easy to occur, so that pipe blockage is caused. According to the invention, firstly, different emulsification systems are adopted to establish a core-shell coating reaction system in a silicone-acrylic emulsion synthesis process, so that an organic silicon monomer and an acrylic acid monomer can be uniformly and completely polymerized, which is equivalent to establishing a non-interfering reaction space, and the problem of difficult spray drying caused by high viscosity due to enrichment and adhesion of emulsion ions is prevented. In conclusion, the method is pioneering, overcomes great technical difficulty, and enables the prepared product to have innovation advantages and performance advantages.
Disclosure of Invention
The invention aims to provide a method for preparing redispersible latex powder by taking modified silicone-acrylate emulsion as a raw material, which aims to solve the problems of high brittleness, poor flexibility, poor deformation resistance, difficulty in resisting cement shrinkage, high water resistance and impermeability loss caused by high water absorption and the like of the conventional redispersible latex powder.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for preparing redispersible latex powder by taking modified silicone-acrylic emulsion as a raw material comprises the following steps:
(1) synthesizing modified silicone-acrylate emulsion: taking an organosilicon monomer with an unsaturated bond and an acrylic monomer as raw materials, and synthesizing a modified silicone-acrylate emulsion through a core-shell wrapping emulsification reaction, an initiation polymerization reaction and an oxidation reduction reaction under an auxiliary agent condition;
(2) preparing redispersible latex powder: taking the modified silicone-acrylic emulsion prepared in the step (1) as a raw material, respectively preparing a powder spraying mixed solution through an isolation mixed solution preparation stage, a colloid protection mixed solution preparation stage and a powder spraying mixed solution preparation stage under the action of a protective colloid, an isolating agent, a bubble eliminating agent, a dispersing agent, a flowing agent and an anti-plate caking agent, and drying the mixture into redispersible latex powder at a high temperature by adopting a rotary liquid spraying technology, wherein the specific reaction operation of the silicone-acrylic rubber powder production is as follows: 1. preparing an isolated mixed solution: fully and uniformly stirring the silicone-acrylic emulsion and the separant in a reaction container according to the proportion, and mixing for 0.5 h; 2. preparing a colloid protection mixed solution: mixing the prepared isolation mixed solution and the pre-dispersed protective colloid mixed solution according to a certain proportion to prepare colloid protective mixed solution; 3. preparing a powder spraying mixed solution: adding bubble eliminating agent, dispersant and flow agent into the colloid protection mixed solution, and stirring uniformly to obtain powder spraying mixed solution. Spraying the mixed solution in a rotary liquid spray drying tower, adding an anti-caking agent in the spraying process, wherein the rotating speed of a spraying head of the spraying tower is 22000-.
Further, in the step (1), the organosilicon monomer with an unsaturated bond is an unsaturated silane monomer coupling agent, the unsaturated acrylic monomer is an unsaturated acrylate monomer, the auxiliary agent is a polymeric emulsifier, a redox catalyst, an initiator, a foam inhibitor, a pH regulator, a surfactant and deionized water, and the dosage percentage of each raw material is 6-10% of the unsaturated silane coupling monomer, 35-45% of the unsaturated acrylate monomer, 0.5-1.2% of the polymeric emulsifier, 0.2-0.4% of the redox catalyst, 0.2-0.5% of the initiator, 0.2-0.6% of the foam inhibitor, 0.3-0.5% of the pH regulator, 0.1-0.3% of the surfactant and 40-60% of the deionized water.
Further, the unsaturated silane monomer coupling agent is at least one of vinyl trichlorosilane, vinyl trimethoxy silane, vinyl triacetoxy silane and ethyl triethoxy silane, the larger the molecule connected on a Si-O bond is, the lower the polarity is, the better the hydrophobic and hydrophobic performance is, the higher the stability is, and the better the performance is, and the unsaturated acrylate monomer is at least one of methyl methacrylate, hydroxyethyl acrylate, maleic acid, itaconic acid and n-butyl acrylate.
Furthermore, the polymeric emulsifier is a nonionic emulsifier with a hydrophilic-lipophilic balance value of 10-15, such as polyoxyethylene ether, polyol fatty acid ester and ethylene oxide block copolymer, and the emulsifier is a key step of silicone-acrylic emulsion polymerization reaction and directly influences the viscosity and molecular polarity of the polymeric emulsion. The nonionic emulsifier has higher emulsifying efficiency, is not easy to react with metal ions relative to other emulsifiers, is not easy to break emulsion when applied to a strong alkaline system, has better stability, can better protect silane bonds from being easily damaged in a core-shell reaction, has better dispersion and film-forming properties after being sprayed and dried, and effectively reduces the agglomeration phenomenon during spraying, the redox catalyst is at least one of nickel dioxide and potassium permanganate, the initiator is at least one of ammonium persulfate, potassium persulfate, azodiisobutyronitrile and sodium persulfate/ferrous sulfate, the initiator can efficiently cause the chain polymerization reaction of the polymerization reaction, so that the reaction is rapidly carried out, the foam inhibitor is a polyether defoamer, the pH regulator is a sodium hydroxide solution, and the surfactant is sodium dodecyl benzene sulfonate.
Further, the specific reaction operation of the silicone-acrylic emulsion in the step (1) is as follows: 1. pre-emulsion polymerization, core-shell reaction stage: putting unsaturated silane coupling monomer and polymeric emulsifier into a reactor heated by water bath according to a certain proportion, emulsifying for 0.5h at room temperature, then heating to 65-70 ℃, and reacting for 2h, wherein the main effects of the steps are that the polarity of the unsaturated silane coupling monomer is smaller, the solubility in water is small, the polymeric emulsifier is added to fully disperse the unsaturated silane coupling monomer in water to reach the hydrophilic-lipophilic balance value, and the silane group of the emulsifier is wrapped to form core-shell protection, and the group is not damaged in the subsequent reaction; 2. initiating polymerization stage: dropwise adding a pH regulator into the reacted solution, regulating the pH to 8-9, adding an unsaturated acrylic monomer according to a proportion, heating to 85 ℃, slowly dropwise adding an initiator, and continuously keeping the temperature of 85 ℃ for reaction for 1.5h after dropwise adding; 3. and in the oxidation-reduction stage, adding a redox catalyst, a surfactant and a foam inhibitor into the solution, heating to 95 ℃, oxidizing unreacted double bond monomers into saturated double bonds in the stage to enable reaction products to be more stable, wherein the reaction time in the stage is 1h, cooling the obtained polymer blue light emulsion (with the solid content of 45-55%) to room temperature for later use, and performing second-step spray drying to obtain the redispersible latex powder.
Furthermore, the dosage percentage of the raw materials in the step (2) is 60-75% of modified silicone-acrylate emulsion, 10-12% of protective colloid, 3-5% of separant, 2-4% of bubble remover, 1-1.5% of dispersant, 0.5-1.0% of flow agent and 6-23.5% of anti-plate binder.
Further, in the step (2), the protective colloid is at least one of a high molecular organic compound polyethylene glycol and polyvinylpyrrolidone, the protective colloid is a water-soluble high molecular linear organic compound, a common protective colloid of the redispersible latex powder is polyvinyl alcohol, but the common protective colloid is not easy to adopt in the silicone-acrylate emulsion powdering, compared with the polyvinyl alcohol, the water solubility of the polyethylene glycol and polyvinylpyrrolidone is better, the protective colloid can prevent the polymer from carbonizing caused by overhigh temperature in the spray drying process on one hand, on the other hand, the polymer has better hydrophilicity and film forming property after being powdered, the separant is at least one of calcium stearate, magnesium stearate and wax powder, the separant is a key step of powder spraying and drying, belongs to a hydrophobic compound, is not easy to be wetted by water, and can be dispersed in the silicone-acrylate emulsion under forced stirring, the emulsion has the advantages that the emulsion has a good granulation property only by playing an isolation role and reducing the acting force among emulsion particles to enable the emulsion particles to form independent single bodies which are not interfered with each other and preventing the aggregation and agglomeration phenomenon of spray drying, the bubble eliminating agent is at least one of a mineral oil defoaming agent and an organic silicon defoaming agent, the dispersing agent is at least one of sodium tripolyphosphate, sodium hexametaphosphate and naphthalenesulfonate, the flowing agent is at least one of melamine, naphthalenesulfonate and a carboxylic acid water reducing agent, and the anti-caking agent is at least one of fumed silica, precipitated silica, 1500-mesh talcum powder and 1200-mesh metakaolin.
Furthermore, the rotating speed of the spray head in the rotary liquid spraying technology is 28000-30000r/min, the temperature of the spray chamber is 140-160 ℃, compared with the rotating speed of the conventional redispersible latex powder, the rotating speed of the silicone-acrylic emulsion needs to be higher, and finer emulsion particles can be centrifuged during the rotary drying process, and the finer particle size is, the higher the corresponding rubber powder dispersibility, the film-forming property and the comprehensive performance are.
The invention has the advantages that: the invention overcomes the double technical problems of the silicon-acrylic emulsion powder spraying and drying compared with the traditional powder spraying technology of redispersible milk, and belongs to the initiative technology in China. The silicone-acrylate redispersible latex powder prepared by the invention is applied to building mortar, concrete and paint, and can better improve the comprehensive properties of products such as heat resistance, freeze-thaw resistance, water resistance, permeability resistance, stain resistance, self-cleaning property and the like.
Detailed Description
Example one
The selection and preparation process of the silicone-acrylic emulsion No. 1 sample polymer material are shown in Table 1 (the specific process is the reaction process of the silicone-acrylic emulsion)
TABLE 1
Composition of Percentage of use
Vinyl trichlorosilane (CH2 ═ CHSiCl3) 8.0％
Methyl Methacrylate (MMA) 35％
Polyol fatty acid esters 0.8％
Nickel dioxide 0.3％
Azobisisobutyronitrile 0.3％
Polyether defoaming agent 0.4％
Sodium hydroxide solution 0.45％
Sodium dodecyl benzene sulfonate 0.22％
Deionized water 54.53％
The selection and preparation process of sample No. 1 of the silicone-acrylate re-dispersible latex powder are shown in Table 2 (the reaction process of the silicone-acrylate re-dispersible latex powder is shown in detail)
TABLE 2
Composition of Percentage of use
Silicone acrylic emulsion No. 1 70％
Polyethylene glycol (molecular weight 15000) 11％
Magnesium stearate 3.5％
Silicone defoaming agent 3％
Sodium hexametaphosphate 1.2％
Carboxylic acid water reducing agent 0.8％
Fumed silica 10.5％
Example two
The selection and preparation process of the silicone-acrylic emulsion No. 2 sample polymer material are shown in Table 3 (the specific process is the reaction process of the silicone-acrylic emulsion)
TABLE 3
Figure BDA0003158128070000071
The selection and preparation process of sample No. 2 of the silicone-acrylate re-dispersible latex powder are shown in Table 4 (the reaction process of the silicone-acrylate re-dispersible latex powder is shown in detail)
TABLE 4
Figure BDA0003158128070000072
EXAMPLE III
The selection and preparation process of the silicone-acrylic emulsion No. 3 sample polymer material are shown in Table 5 (the specific process is the reaction process of the silicone-acrylic emulsion)
TABLE 5
Figure BDA0003158128070000073
Figure BDA0003158128070000081
The selection and preparation process of sample No. 3 of the silicone-acrylate re-dispersible latex powder are shown in Table 6 (the reaction process of the silicone-acrylate re-dispersible latex powder is shown in detail)
TABLE 6
Composition of Percentage of use
Silicone acrylic emulsion No. 3 75％
Polyvinylpyrrolidone 10％
Wax powder 3.0％
Mixing mineral oil defoaming agent and organosilicon defoaming agent in a ratio of 1:1 4％
Mixing sodium tripolyphosphate and sodium hexametaphosphate in a ratio of 1:2 1.0％
Melamine mixed with naphthalene sulfonate 1:2 1.0％
Fumed silica is 1:1 mixed with 1200 mesh metakaolin 6.0％
The redispersible latex powder produced in the above examples 1-3 according to the production process is a silicone-acrylic redispersible latex powder.
The silicon-acrylic re-dispersible latex powder obtained by the production is prepared into a ceramic tile binder (PO42.5 cement: 35%, 40-140 mesh quartz sand: 63.2%, 10 ten thousand viscosity cellulose ether: 0.3%, re-dispersible latex powder 1.5%, and is compared with high-end re-dispersible latex powder in the market (comparison sample 1: ternary copolymerization hydrophobic rubber powder, comparison sample 2: pure acrylic rubber powder) for forming, and the product performance is tested according to ceramic wall and floor tile adhesive (JG/T547-.
TABLE 7
Figure BDA0003158128070000082
Figure BDA0003158128070000091
The test result of the tile adhesive shows that compared with the traditional imported high-end redispersible latex powder, the silicon-acrylic redispersible latex powder has higher cohesive force, better waterproof and impervious effect, and more excellent heat resistance and freeze-thaw resistance when being applied to cement mortar.
The silica-acrylic redispersible latex powder obtained by the production is prepared into decorative mortar (PO42.5 white cement: 25%, metakaolin: 5.0%, 40-140 mesh quartz sand: 66.75%, defoamer: 0.2%, wood fiber 0.4%, 4 ten thousand viscosity cellulose ether: 0.15%, redispersible latex powder 2.5%, and is compared and formed with the market high-end redispersible latex powder (comparative sample 1: terpolymer hydrophobic rubber powder, comparative sample 2: pure acrylic rubber powder), and the product performance is tested according to wall facing mortar (JG/T1024-shaped 2019), and the specific test result is shown in Table 8.
TABLE 8
Example 1 Example 2 Example 3 Comparative sample 1 Comparative sample 2
240min Water absorption/g 1.12 1.15 1.14 10.24 9.25
Resistance to efflorescence No efflorescence No efflorescence No efflorescence Large area efflorescence Large area efflorescence
Stain resistance Stage 2 Stage 2 Stage 2 Level 0 Level 0
Weather resistance Level 1 Level 1 Level 1 Powder falling and color changing Powder falling and color changing
From the test results of the decorative mortar, compared with the traditional imported high-end redispersible latex powder, the silicone-acrylic redispersible latex powder has the advantages of lower water absorption, better alkali resistance, stain resistance, self-cleaning property, lasting weather resistance and the like when being applied to cement mortar.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A method for preparing redispersible latex powder by taking modified silicone-acrylic emulsion as a raw material is characterized by comprising the following steps:
(1) synthesizing modified silicone-acrylate emulsion: taking an organosilicon monomer with an unsaturated bond and an acrylic monomer as raw materials, and synthesizing a modified silicone-acrylate emulsion through a core-shell wrapping emulsification reaction, an initiation polymerization reaction and an oxidation reduction reaction under an auxiliary agent condition;
(2) preparing redispersible latex powder: taking the modified silicone-acrylic emulsion prepared in the step (1) as a raw material, respectively preparing a spraying mixed solution through an isolation mixed solution preparation stage, a colloid protection mixed solution preparation stage and a spraying mixed solution preparation stage under the action of a protective colloid, an isolating agent, a bubble eliminating agent, a dispersing agent, a flowing agent and an anti-plate caking agent, and drying at a high temperature by adopting a rotary liquid spraying technology to obtain the redispersible emulsion powder.
2. The method for preparing the redispersible latex powder by using the modified silicone-acrylic emulsion as the raw material as claimed in claim 1, wherein: the organosilicon monomer of the unsaturated bond in the step (1) is an unsaturated silane monomer coupling agent, the unsaturated acrylic monomer is an unsaturated acrylate monomer, the auxiliary agent is a polymeric emulsifier, a redox catalyst, an initiator, a foam inhibitor, a pH regulator, a surfactant and deionized water, and the dosage percentage of the raw materials is 6-10% of the unsaturated silane coupling monomer, 35-45% of the unsaturated acrylate monomer, 0.5-1.2% of the polymeric emulsifier, 0.2-0.4% of the redox catalyst, 0.2-0.5% of the initiator, 0.2-0.6% of the foam inhibitor, 0.3-0.5% of the pH regulator, 0.1-0.3% of the surfactant and 40-60% of the deionized water.
3. The method for preparing the redispersible latex powder by using the modified silicone-acrylic emulsion as the raw material as claimed in claim 2, wherein: the unsaturated silane monomer coupling agent is at least one of vinyl trichlorosilane, vinyl trimethoxy silane, vinyl triacetoxy silane and ethyl triethoxy silane, and the unsaturated acrylate monomer is at least one of methyl methacrylate, hydroxyethyl acrylate, maleic acid, itaconic acid and n-butyl acrylate.
4. The method for preparing the redispersible latex powder by using the modified silicone-acrylic emulsion as the raw material as claimed in claim 3, wherein: the polymerization emulsifier is a nonionic emulsifier with a hydrophilic-lipophilic balance value of 10-15, the redox catalyst is at least one of nickel dioxide and potassium permanganate, the initiator is at least one of ammonium persulfate, potassium persulfate, azodiisobutyronitrile and sodium persulfate/ferrous sulfate, the foam inhibitor is a polyether defoamer, the pH regulator is a sodium hydroxide solution, and the surfactant is sodium dodecyl benzene sulfonate.
5. The method for preparing the redispersible latex powder by using the modified silicone-acrylic emulsion as the raw material as claimed in claim 4, wherein: in the step (1), the core-shell coating emulsification reaction temperature is 65-70 ℃, the reaction time is 2 hours, the polymerization initiation reaction temperature is 85 ℃, the reaction time is 1.5 hours, the temperature of the redox reaction is 95 ℃, and the reaction time is 2 hours, and all the reactions are water bath reactions.
6. The method for preparing the redispersible latex powder by using the modified silicone-acrylic emulsion as the raw material as claimed in claim 5, wherein: in the step (2), the dosage percentage of the raw materials is 60-75% of modified silicone-acrylate emulsion, 10-12% of protective colloid, 3-5% of separant, 2-4% of bubble remover, 1-1.5% of dispersant, 0.5-1.0% of flow agent and 6-23.5% of anti-plate binder.
7. The method for preparing the redispersible latex powder by using the modified silicone-acrylic emulsion as the raw material as claimed in claim 6, wherein: the protective colloid is at least one of high molecular organic compounds polyethylene glycol and polyvinylpyrrolidone, the isolating agent is at least one of calcium stearate, magnesium stearate and wax powder, the bubble eliminating agent is at least one of mineral oil defoaming agent and silicone defoaming agent, the dispersing agent is at least one of sodium tripolyphosphate, sodium hexametaphosphate and naphthalenesulfonate, the flowing agent is at least one of melamine, naphthalenesulfonate and carboxylic acid water reducing agent, and the anti-hardening agent is at least one of fumed silica, precipitated silica, 1500-mesh talcum powder and 1200-mesh metakaolin.
8. The method for preparing the redispersible latex powder by using the modified silicone-acrylic emulsion as the raw material as claimed in claim 7, wherein: the rotating speed of the spray head in the rotary liquid spraying technology is 28000-30000r/min, and the temperature of the spray chamber is 140-160 ℃.
CN202110783447.0A 2021-07-12 2021-07-12 Method for preparing redispersible latex powder by taking modified silicone-acrylic emulsion as raw material Pending CN113321442A (en)

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