CN111662415A - Soap-free self-crosslinking nano acrylic emulsion and preparation method and application thereof - Google Patents

Soap-free self-crosslinking nano acrylic emulsion and preparation method and application thereof Download PDF

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CN111662415A
CN111662415A CN202010559843.0A CN202010559843A CN111662415A CN 111662415 A CN111662415 A CN 111662415A CN 202010559843 A CN202010559843 A CN 202010559843A CN 111662415 A CN111662415 A CN 111662415A
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parts
water
soap
acrylic resin
emulsion
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李成林
庄国波
郭燕鹏
谭其池
陈键
杨霞
闫崇文
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HENGCHANG PAINT (HUIYANG) CO Ltd
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HENGCHANG PAINT (HUIYANG) CO Ltd
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F265/00Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C08F265/04Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
    • C08F265/06Polymerisation of acrylate or methacrylate esters on to polymers thereof
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00Processes of polymerisation
    • C08F2/12Polymerisation in non-solvents
    • C08F2/16Aqueous medium
    • C08F2/22Emulsion polymerisation
    • C08F2/24Emulsion polymerisation with the aid of emulsifying agents
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00Coating compositions based on homopolymers or 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04Homopolymers or copolymers of esters
    • C09D133/14Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/63Additives non-macromolecular organic
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/014Additives containing two or more different additives of the same subgroup in C08K
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/02Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2312/00Crosslinking

Abstract

The invention belongs to the technical field of water-based paint. A soap-free self-crosslinking nano acrylic emulsion comprises the following components: the water-based acrylic resin comprises water-based acrylic resin, methyl methacrylate, styrene, butyl acrylate, isooctyl acrylate, a crosslinking monomer, adipyl hydrazide, ammonium persulfate, tert-butyl hydroperoxide, VC, ammonia water and the balance of water; the crosslinking monomer is diacetone acrylamide and butyl acrylamide. The emulsion has the advantages of 50-100nm of particle size, good wettability, good permeability, low lowest film-forming temperature of a coating film, high curing speed, high gloss of the coating film, capability of being polished and high hardness of the coating film reaching 3H-5H. The emulsion has low foam, a wetting agent and a defoaming agent are not required to be added when the emulsion is applied to the water-based wood paint, the emulsion has small particle size, so that the warm color of a paint film to wood is good, and the paint film is transparent.

Description

Soap-free self-crosslinking nano acrylic emulsion and preparation method and application thereof
Technical Field
The invention belongs to the technical field of water-based coatings, and relates to a soap-free self-crosslinking nano acrylic emulsion, and a preparation method and application thereof.
Background
Acrylic emulsion has become the first large resin coating because of its low price, good gloss and color retention, good thermal aging resistance and good ultraviolet aging resistance. The acrylate copolymer is an amorphous polymer, and has the problem of low hardness when being used as a wood coating. The product Primal EP-6060 of Rohm Haas water-based acrylic polymer for factory wood lacquer has a film forming temperature Tg of 58 ℃, but the hardness of the final coating film is only H. The styrene-acrylic copolymer emulsion is researched by Xiuyuang and the like to solve the problems of generation and control of structural gel in the synthesis process, and the core-shell technology is adopted to solve the problems of adhesion fastness and polishing of the high-Tg styrene-acrylic emulsion in the wood primer, but the hardness is only HB. By adopting acrylate soap-free emulsion polymerization in the presence of tetraethyl silicate, although the hardness of a coating film can be improved to 2H, the polymerization stability in the emulsion polymerization process is poor, and industrial production is difficult to realize. Therefore, how to improve the comprehensive properties such as hardness, stability and the like of the aqueous wood lacquer coating taking the acrylic ester copolymer emulsion as a film forming substance is always a difficult problem of research and development and synthesis of the acrylic ester copolymer emulsion.
The invention patent CN110845656A discloses a hydroxy acrylic emulsion, which adopts a hydroxy acrylic monomer with 7-10C side chains to combine with an acid monomer and an acrylate monomer, and can endow a paint film with faster drying speed and hardness, and the hardness of the paint film is only 3H at most. The invention CN110028617A discloses a soap-free self-crosslinking nano acrylic emulsion, which is synthesized by introducing a self-crosslinking monomer and a self-made macromolecular stabilizer, can form a compact protective film, and has the characteristics of stain resistance, wear resistance, good water resistance and the like, but the hardness of the coating film is not improved. The conventional small molecular emulsion type emulsion polymerization method is difficult to solve the problems of reducing the actual film forming temperature and improving the film hardness, and the emulsion for the water-based wood lacquer is synthesized by the macromolecular emulsifier to solve the problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a soap-free self-crosslinking nano acrylic emulsion which has the particle size of 50-100nm, good wettability and permeability, low minimum film-forming temperature of a coating film, high curing speed, high gloss of the coating film and capability of being polished, and the hardness of the coating film is as high as 3H-5H. The emulsion has low foam, a wetting agent and a defoaming agent are not required to be added when the emulsion is applied to the water-based wood paint, the emulsion has small particle size, so that the warm color of a paint film to wood is good, and the paint film is transparent.
The technical scheme of the invention is as follows:
the soap-free self-crosslinking nano acrylic emulsion comprises the following components in percentage by mass: 20-25% of water-based acrylic resin, 3-8% of methyl methacrylate, 3-8% of styrene, 3-8% of butyl acrylate, 3-8% of isooctyl acrylate, 4-5% of crosslinking monomer, 0.3-0.5% of adipic dihydrazide, 0.1-0.2% of ammonium persulfate, 0.05-0.1% of tert-butyl hydroperoxide, 0.05-0.1% of VC, 1-3% of ammonia water and the balance of water; the crosslinking monomer is diacetone acrylamide (DAAM) and butyl acrylamide (TBAM).
Further, the mass ratio of the diacetone acrylamide to the butyl acrylamide is 1-2: 1-3.
Further, the aqueous acrylic resin comprises acrylic resin with high acid value and acrylic resin with low acid value, wherein the acid value of the acrylic resin with high acid value is 210-220mgKOH/g, Mw=16000-20000, the acrylic resin with low acid value has the acid value of 80-90mgKOH/g and Mw=5500-6500。
Further, the mass ratio of the high acid value acrylic resin to the low acid value acrylic resin is 6-9: 1-4.
Further, the low acid value acrylic resin comprises the following components in parts by weight: 20-30 parts of n-propanol, 6-10 parts of tert-butyl peroxy-2-ethylhexanoate (TBPO), 10-12 parts of Methyl Methacrylate (MMA), 8-10 parts of Butyl Acrylate (BA), 0.2-0.5 part of mercaptoethanol, 10-15 parts of isooctyl acrylate (2-EHA), 10-15 parts of mono-ethylene glycol acrylate (PEG), 14-16 parts of Acrylic Acid (AA), 10-15 parts of ammonia water and 60-80 parts of water.
Further, the high-acid-value acrylic resin comprises the following components in parts by weight: 25-30 parts of n-propanol, 3-5.5 parts of tert-butyl peroxy-2-ethylhexanoate (TBPO), 4-6 parts of hydroxyethyl acrylate (HEA), 60-65 parts of isooctyl acrylate (2-EHA), 20-25 parts of Acrylic Acid (AA), 12-15 parts of acrylic acid mono-polyethylene glycol ester (PEG), 0.1-0.3 part of mercaptoethanol, 13-15 parts of ammonia water and 60-80 parts of water.
The preparation method of the soap-free self-crosslinking nano acrylic emulsion comprises the following steps:
a. mixing and stirring methyl methacrylate, styrene, butyl acrylate, isooctyl acrylate and a crosslinking monomer to prepare a uniform and stable transparent mixed monomer for later use;
b. mixing ammonium persulfate accounting for 85-95% of the total amount of ammonium persulfate with water accounting for 70-80% of the total amount of water to obtain an ammonium persulfate aqueous solution for later use;
c. stirring and mixing water-based acrylic resin and water, adding ammonia water to adjust the pH value of the solution to 8-9, heating to 84-86 ℃, keeping the temperature for 10-15min, adding a mixed monomer accounting for 5-10% of the total amount of the mixed monomer, simultaneously adding the rest ammonium persulfate, keeping the temperature for 5-10min, then dropwise adding the rest mixed monomer and the ammonium persulfate aqueous solution, wherein the dropwise adding time is 90-120min, the dropwise adding temperature is 80-90 ℃, keeping the temperature for 60-75min at 84-86 ℃ after the dropwise adding is finished, and cooling to 65-67 ℃ after the temperature is finished for elimination;
d. and (2) adding the initiator, namely, removing tert-butyl hydroperoxide, keeping the temperature for 10-15min, then, dropwise adding the initiator, namely, removing the reducing agent VC, keeping the dropwise adding temperature at 65-67 ℃, keeping the dropwise adding time at least 30min, keeping the temperature for 30-35min after the dropwise adding is finished, cooling to the temperature below 40 ℃, adding ammonia water to adjust the pH of the solution to 8.0-8.5, adding adipoyl hydrazine, stirring for 30min, and then, filtering to obtain the soap-free self-crosslinking nano acrylic emulsion.
The application of the soap-free self-crosslinking nano acrylic emulsion in the water-borne wood paint is characterized in that the water-borne wood paint comprises the following components in parts by mass: 70-80 parts of soap-free self-crosslinking nano acrylic emulsion, 0.3-0.5 part of flatting agent, 3-5 parts of dipropylene glycol butyl ether, 3-5 parts of dipropylene glycol methyl ether, 0.1-0.5 part of thickening agent, 0.05-0.1 part of preservative, 0.1-0.5 part of dispersing agent, 3-5 parts of anti-scratch agent, 3-5 parts of zinc stearate and 15-20 parts of deionized water.
The invention has the following beneficial effects:
the invention selects the macromolecular emulsifier as the auxiliary agent for emulsion polymerization, and can effectively reduce the actual minimum film-forming temperature. The acrylic resin with high acid value and the acrylic resin with low acid value are selected for compounding, so that the drying speed of the coating in the drying process is consistent, and the coating has good coating performance and higher film forming speed. The diacetone acrylamide and the butyl acrylamide are selected as crosslinking monomers, so that the hardness of the coating can be improved to 3H-5H, and the transparent appearance, good water resistance, small and uniform particle size of the emulsion coating are ensured.
Detailed Description
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
The following table shows the formulation (unit:%) of 3 examples and 2 comparative examples of the soap-free self-crosslinking nano acrylic emulsion of the present invention.
The crosslinking monomer is diacetone acrylamide and butyl acrylamide, and the mass ratio of the diacetone acrylamide to the butyl acrylamide is 3: 1; the water-based acrylic resin comprises high acid value acrylic resin and low acid value acrylic resin, andthe acrylic resin with high acid value has an acid value of 220mgKOH/g and Mw=20000, the acid value of the acrylic resin with low acid value is 80mgKOH/g, Mw=5500, and the mass ratio of the high acid value acrylic resin to the low acid value acrylic resin is 8: 2. The following table is a table of the formulations (unit: parts) of the aqueous acrylic resins used in the examples of the soap-free self-crosslinking nano acrylic emulsion of the present invention.
The preparation method of the water-based acrylic resin comprises the following steps: adding the bottom kettle material into a reaction kettle, heating to a reflux temperature, adding a bottom kettle initiator, dropwise adding a mixed monomer, finishing dropwise adding within 5 hours, wherein the dropwise adding temperature is the reflux temperature, keeping the temperature for 1 hour after dropwise adding, adding a supplementary material, keeping the temperature for 2 hours, cooling to below 60 ℃, removing a solvent, adding a neutralizer, stirring at a high speed, and discharging to room temperature to obtain the water-based acrylic resin.
The preparation method of the soap-free self-crosslinking nano acrylic emulsion comprises the following steps:
a. mixing and stirring methyl methacrylate, styrene, butyl acrylate, isooctyl acrylate and a crosslinking monomer to prepare a uniform and stable transparent mixed monomer for later use;
b. mixing ammonium persulfate accounting for 85-95% of the total amount of ammonium persulfate with water accounting for 70-80% of the total amount of water to obtain an ammonium persulfate aqueous solution for later use;
c. stirring and mixing water-based acrylic resin and water, adding ammonia water to adjust the pH value of the solution to 8-9, heating to 84-86 ℃, keeping the temperature for 10-15min, adding a mixed monomer accounting for 5% of the total amount of the mixed monomer, simultaneously adding the rest ammonium persulfate, keeping the temperature for 5-10min, dropwise adding the rest mixed monomer and the ammonium persulfate aqueous solution, wherein the dropwise adding time is 90-120min, the dropwise adding temperature is 80-90 ℃, keeping the temperature for 60-75min at 84-86 ℃ after the dropwise adding is finished, and cooling to 65-67 ℃ after the heat preservation is finished for elimination;
d. and (2) adding the initiator, namely, removing tert-butyl hydroperoxide, keeping the temperature for 10-15min, then, dropwise adding the initiator, namely, removing the reducing agent VC, keeping the dropwise adding temperature at 65-67 ℃, keeping the dropwise adding time at least 30min, keeping the temperature for 30-35min after the dropwise adding is finished, cooling to the temperature below 40 ℃, adding ammonia water to adjust the pH of the solution to 8.0-8.5, adding adipoyl hydrazine, stirring for 30min, and then, filtering to obtain the soap-free self-crosslinking nano acrylic emulsion.
One, emulsion and coating film properties
The performance of the emulsions and coating films of examples 1-3 and comparative examples 1-2 of the soap-free self-crosslinking nano acrylic emulsion of the present invention was tested, and the test results are shown in the following table.
Therefore, the emulsion has small and uniform particle size, transparent appearance, high drying speed of the coating film, good adhesive force, alcohol resistance and water resistance, and the hardness of the coating film reaches 3H-5H.
Secondly, influence of the content of the waterborne acrylic resin on the minimum film forming temperature of the emulsion
The influence of the content of the aqueous acrylic resin on the lowest film forming temperature of the emulsion is tested by taking the content of the aqueous acrylic resin and water in the soap-free self-crosslinking nano acrylic emulsion in example 1 of the invention as variables, and the test results are shown in the following table.
It can be seen that increasing the aqueous acrylic resin content results in a decrease in the minimum film forming temperature of the emulsion. When the amount of the aqueous acrylic resin is large, the actual minimum film-forming temperature can be effectively lowered even if the design TG temperature is high. The invention selects the macromolecular emulsifier as the auxiliary agent for emulsion polymerization, and can effectively reduce the actual minimum film-forming temperature.
Effects of three or two aqueous acrylic resins on emulsions and coatings
The ratio of the two water-based acrylic resins in the example 1 of the soap-free self-crosslinking nano acrylic emulsion of the invention is used as a single variable, the influence of the two water-based acrylic resins on the emulsion and the coating is tested, and the test results are shown in the following table.
The water resistance of the coating film is related to the degree of compactness of the coating film and the hydrophilicity of the film forming material. The film-forming substance with too strong hydrophobicity can cause inconsistent drying speed of the surface and the inside of the coating film in the drying process, the surface and the inside of the coating film are easy to be dried, and the performances of the coating film such as water resistance, hardness and the like are reduced. The emulsion only selects high-acid-value acrylic resin, which causes inconsistent drying speed of the surface and the inside of the coating film and reduced performance of the coating film. The film-forming substance with too strong hydrophilicity can cause the water resistance and the alcohol resistance of the film to be reduced, and the dosage of the acrylic resin with low acid value in the emulsion can be increased, so that the film-forming speed and the appearance of the film can be improved, but the water resistance and the alcohol resistance of the film are reduced. Therefore, the acrylic resin with high acid value and the acrylic resin with low acid value are selected for compounding, so that the coating has good coating performance and high film forming speed.
Effect of Cross-linking monomers on emulsions and coatings
The content of the two crosslinking monomers and water in the soap-free self-crosslinking nano acrylic emulsion of the invention in example 1 is used as variables, the influence of the two crosslinking monomers on the emulsion and the coating is tested, and the test results are shown in the following table.
Only DAAM is used as a crosslinking monomer, the hardness of the coating is improved along with the increase of the dosage, the water resistance is improved firstly and then is reduced, and the influence of the dosage on the particle size of the emulsion is small. The hardness of the coating film can reach 2H only by using TBAM as a crosslinking monomer, and the particle size of the emulsion is increased along with the increase of the using amount of the TBAM, so that the coating film is not bright, and the appearance of the coating film is influenced. The crosslinking monomer is prepared by compounding DAAM and TBAM, can improve the hardness of a coating film to 5H, and simultaneously ensures that the emulsion has good water resistance, small particle size and uniformity.

Claims (8)

1. The soap-free self-crosslinking nano acrylic emulsion is characterized by comprising the following components in percentage by mass: 20-25% of water-based acrylic resin, 3-8% of methyl methacrylate, 3-8% of styrene, 3-8% of butyl acrylate, 3-8% of isooctyl acrylate, 4-5% of crosslinking monomer, 0.3-0.5% of adipic dihydrazide, 0.1-0.2% of ammonium persulfate, 0.05-0.1% of tert-butyl hydroperoxide, 0.05-0.1% of VC, 1-3% of ammonia water and the balance of water; the crosslinking monomer is diacetone acrylamide and butyl acrylamide.
2. The soap-free self-crosslinking nano acrylic emulsion of claim 1, wherein the mass ratio of diacetone acrylamide to butyl acrylamide is 2-3: 1-3.
3. The soap-free self-crosslinking nano acrylic emulsion as claimed in claim 1, wherein the aqueous acrylic resin comprises a high acid value acrylic resin and a low acid value acrylic resin, and the acid value of the high acid value acrylic resin is 210-220mgKOH/g, Mw=16000-20000, the acrylic resin with low acid value has the acid value of 80-90mgKOH/g and Mw=5500-6500。
4. The soap-free self-crosslinking nano acrylic emulsion of claim 3, wherein the mass ratio of the high acid number acrylic resin to the low acid number acrylic resin is 6-9: 1-4.
5. The soap-free self-crosslinking nano acrylic emulsion of claim 3, wherein the low acid number acrylic resin comprises the following components in parts by weight: 20-30 parts of n-propanol, 6-10 parts of tert-butyl peroxy-2-ethylhexanoate, 10-12 parts of methyl methacrylate, 8-10 parts of butyl acrylate, 0.2-0.5 part of mercaptoethanol, 10-15 parts of isooctyl acrylate, 10-15 parts of acrylic acid mono-polyethylene glycol ester, 14-16 parts of acrylic acid, 10-15 parts of ammonia water and 60-80 parts of water.
6. The soap-free self-crosslinking nano acrylic emulsion of claim 3, wherein the high acid number acrylic resin comprises the following components in parts by weight: 25-30 parts of n-propanol, 3-5.5 parts of tert-butyl peroxy-2-ethylhexanoate, 4-6 parts of hydroxyethyl acrylate, 60-65 parts of isooctyl acrylate, 20-25 parts of acrylic acid, 12-15 parts of acrylic acid mono-polyethylene glycol ester, 0.1-0.3 part of mercaptoethanol, 13-15 parts of ammonia water and 60-80 parts of water.
7. A method for preparing the soap-free self-crosslinking nano acrylic emulsion according to any one of claims 1 to 6, comprising the steps of:
a. mixing and stirring methyl methacrylate, styrene, butyl acrylate, isooctyl acrylate and a crosslinking monomer to prepare a uniform and stable transparent mixed monomer for later use;
b. mixing ammonium persulfate accounting for 85-95% of the total amount of ammonium persulfate with water accounting for 70-80% of the total amount of water to obtain an ammonium persulfate aqueous solution for later use;
c. stirring and mixing water-based acrylic resin and water, adding ammonia water to adjust the pH value of the solution to 8-9, heating to 84-86 ℃, keeping the temperature for 10-15min, adding a mixed monomer accounting for 5-10% of the total amount of the mixed monomer, simultaneously adding the rest ammonium persulfate, keeping the temperature for 5-10min, then dropwise adding the rest mixed monomer and the ammonium persulfate aqueous solution, wherein the dropwise adding time is 90-120min, the dropwise adding temperature is 80-90 ℃, keeping the temperature for 60-75min at 84-86 ℃ after the dropwise adding is finished, and cooling to 65-67 ℃ after the temperature is finished for elimination;
d. and (2) adding the initiator, namely, removing tert-butyl hydroperoxide, keeping the temperature for 10-15min, then, dropwise adding the initiator, namely, removing the reducing agent VC, keeping the dropwise adding temperature at 65-67 ℃, keeping the dropwise adding time at least 30min, keeping the temperature for 30-35min after the dropwise adding is finished, cooling to the temperature below 40 ℃, adding ammonia water to adjust the pH of the solution to 8.0-8.5, adding adipoyl hydrazine, stirring for 30min, and then, filtering to obtain the soap-free self-crosslinking nano acrylic emulsion.
8. The application of the soap-free self-crosslinking nano acrylic emulsion in the aqueous wood lacquer according to any one of claims 1 to 6, wherein the aqueous wood lacquer comprises the following components in parts by mass: 70-80 parts of soap-free self-crosslinking nano acrylic emulsion, 0.3-0.5 part of flatting agent, 3-5 parts of dipropylene glycol butyl ether, 3-5 parts of dipropylene glycol methyl ether, 0.1-0.5 part of thickening agent, 0.05-0.1 part of preservative, 0.1-0.5 part of dispersing agent, 3-5 parts of anti-scratch agent, 3-5 parts of zinc stearate and 15-20 parts of deionized water.
CN202010559843.0A 2020-06-18 2020-06-18 Soap-free self-crosslinking nano acrylic emulsion and preparation method and application thereof Pending CN111662415A (en)

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CN112920668A (en) * 2021-03-29 2021-06-08 台州市万胜涂料有限公司 Pure acrylic emulsion coating
CN113831791A (en) * 2021-09-17 2021-12-24 恒昌涂料(惠阳)有限公司 Water-based alcohol-resistant self-crosslinking nano emulsion and preparation method and application thereof

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