CN109456442B - Low-solvent room-temperature quick-drying type hydroxyl acrylic acid dispersion and preparation method thereof - Google Patents
Low-solvent room-temperature quick-drying type hydroxyl acrylic acid dispersion and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a low-volume agent, room temperature quick-drying type hydroxyl acrylic acid dispersoid and a preparation method thereof. The hydroxy acrylic acid dispersoid takes alpha-methyl styrene linear dimer as a primer, obtains low molecular weight hydroxy acrylic acid resin through stepwise free radical polymerization, and neutralizes water dispersion to obtain the low solvent hydroxy acrylic acid dispersoid. The dispersion has a low organic solvent content of less than 5% by weight based on the total weight of the dispersion. The dispersion can be matched with a water-based isocyanate curing agent to obtain a finish paint which is quick-dried at room temperature, high in gloss and high in hardness.
Description
Technical Field
The invention relates to a hydroxy acrylic acid dispersion with low solvent content, a preparation method thereof and application thereof in water-based paint.
Background
The water-based paint can avoid the serious environmental pollution problem caused by solvent-based paint to a great extent, and meanwhile, under the guidance of the current environmental protection policy, the water-based paint, especially the low solvent-based water-based paint is the inevitable trend of the development of the current paint industry. The bicomponent aqueous hydroxy acrylic acid dispersoid has high gloss, good weather resistance, color and gloss retention and other excellent properties, and is widely applied to the application fields of industrial paints of woodware, metal and the like. At present, a two-component aqueous hydroxy acrylic acid dispersion product is mainly obtained by a free radical solution polymerization method, in order to ensure the heat transfer problem in the reaction process and the sufficient stirring property of reaction monomers, a certain amount of organic solvent is usually required to be added, in addition, the organic solvent can effectively adjust the viscosity of prepolymer resin, water is added for dispersion, stable dispersion products can be obtained, and meanwhile, certain help is provided for the performances of the appearance, the leveling property and the like of a paint film. Therefore, the organic solvent is inevitable in the two-component aqueous hydroxy acrylic acid dispersion, but from the aspects of environment and human health, the difficulty and direction of research and development work of the people are to reduce the content of the organic solvent in the two-component aqueous hydroxy acrylic acid dispersion as much as possible and endow the dispersion with higher performance.
Currently, a reactive diluent monomer is usually added to obtain a hydroxyl acrylic dispersion product, for example, in chinese patent CN1837251B, a hydroxyl functional polycarbonate polyol of one or more reactive diluents is used as a priming solvent to obtain a low solvent hydroxyl acrylic dispersion product, in chinese patent CN100537625C, a reaction product of a glycidyl ester of an aliphatic carboxylic acid and an aliphatic, araliphatic or aromatic carboxylic acid is used as a reactive diluent for priming to reduce the amount of the solvent used to obtain a low solvent product, and in chinese patent CN100564409C, a reaction product of a lactone group-containing compound and a small molecular polyol is used as a reactive diluent to obtain a low solvent hydroxyl acrylic dispersion product. The reactive diluent monomer adopted in the method is required to have low viscosity, usually is a small molecular monomer or a polymer, and generally causes the final hardness of the product to be reduced in the product, so that the performance requirements of some application fields cannot be met.
Disclosure of Invention
The invention adopts a polymerizable substance alpha-methyl styrene linear dimer as a priming solvent, and utilizes free radical polymerization reaction to realize a low-solvent, room-temperature quick-drying hydroxy acrylic acid dispersoid and a preparation method thereof. For example, in the chinese patent CN 106009454, a linear methyl styrene dimer is used as a chain transfer agent (0.5% -2%) to prepare a high solid low viscosity acrylic resin, and in the chinese patent CN 104672366, a linear methyl styrene dimer is also used as a chain transfer agent (0.2% -2%) to prepare a high solid low viscosity acrylic resin. The invention adopts the alpha-methyl styrene linear dimer and the organic solvent as the priming solvent, improves the problem of heat transfer caused by low solvent content, simultaneously effectively reduces the molecular weight and the distribution of the resin by adding the alpha-methyl styrene linear dimer, effectively improves the problem of high viscosity of the prepolymer under the low solvent content, can be used for preparing a high-Tg aqueous hydroxy acrylic acid dispersoid product, and in addition, the alpha-methyl styrene linear dimer can participate in the reaction in the molecular chain segment of the acrylic resin without contributing to VOC, thereby realizing the preparation of the low-solvent room temperature quick-drying hydroxy acrylic acid dispersoid. The invention provides a method for preparing a low-solvent room temperature quick-drying type hydroxyl acrylic acid dispersoid, which utilizes alpha-methyl styrene linear dimer and an organic solvent as a priming solvent, and neutralizes and disperses water through stepwise free radical polymerization to realize the preparation of the low-solvent room temperature quick-drying type hydroxyl acrylic acid dispersoid, wherein the content of the organic solvent of the hydroxyl acrylic acid dispersoid is low and accounts for 0.5 to 5 percent of the total weight of the dispersoid, the glass transition temperature of resin is relatively high, when the hydroxyl acrylic acid dispersoid is matched with a water-based isocyanate curing agent for use, the hydroxyl acrylic acid dispersoid can obtain room temperature quick-drying type, high-hardness and high-gloss finish paint, and in addition, the hydroxyl acrylic acid dispersoid can be matched with amino resin for use to obtain high-performance baking paint.
According to a first aspect of the present invention, there is provided a process for preparing a low-solvent, room temperature fast-drying dispersion of hydroxyacrylic acid comprising the steps of:
synthesizing a hydrophobic structure copolymer (W1) by polymerizing the following raw materials by radical polymerization in the presence of an α -methylstyrene linear dimer as a primer solvent and an organic solvent:
(meth) acrylates and/or vinylaromatic compounds and/or vinyl esters having C1-C22 hydrocarbon radicals in the alcohol moiety: 20 to 80 wt.%, preferably 45 to 70 wt.%,
a hydroxy-functional monomer or derivative thereof: 20 to 80 wt.%, preferably 30 to 55 wt.%,
the wt% being based on the total mass of the above two monomers,
preferably, the monomers are added in a dropwise manner, the dropwise adding time of the monomers is 2.0-5.0 hours, and the temperature is kept for 0.5-2.0 hours after the dropwise adding is finished;
then, the following raw materials were further added in the presence of the hydrophobic structure copolymer (W1) and polymerized to synthesize a hydrophilic structure copolymer (W2):
(meth) acrylates and/or vinylaromatic compounds and/or vinyl esters having C1-C22 hydrocarbon radicals in the alcohol moiety: 18 to 80 wt.%, preferably 45 to 70 wt.%,
a hydroxy-functional monomer or derivative thereof: 18 to 80 wt.%, preferably 26 to 50 wt.%,
acid functional monomers or derivatives thereof: 2 to 16 wt.%, preferably 4 to 14 wt.%,
the wt% is based on the total mass of the above three monomers,
preferably, the monomers are added in a dropping mode, the dropping time of the monomers is 0.5 to 2.0 hours, the temperature is kept for 0.5 to 2.0 hours after the dropping is finished,
and finally neutralizing by a neutralizing agent, and dispersing in water to obtain the low-solvent and room-temperature quick-drying hydroxy acrylic acid dispersion.
Further, the linear dimer of α -methylstyrene constitutes 2% to 20%, preferably 5% to 10%, of the total mass of the monomers used for synthesizing the hydrophobic structure copolymer (W1).
Further, the organic solvent used as a priming solvent accounts for 1% to 15%, preferably 2% to 10% of the total mass of the monomers used for synthesizing the hydrophobic structure copolymer (W1).
In the polymerization reaction for synthesizing the hydrophobic structure copolymer (W1) and the polymerization reaction for synthesizing the hydrophilic structure copolymer (W2), the polymerization reaction temperature is preferably 80-160 ℃, and preferably 130-150 ℃.
The ratio of the total mass of monomers added when synthesizing the hydrophobic structure copolymer (W1) to the total mass of monomers added when synthesizing the hydrophilic structure copolymer (W2) is preferably 1: 0.1 to 0.8, preferably 1: 0.2 to 0.6.
In the polymerization reaction for synthesizing the hydrophobic copolymer (W1) and the polymerization reaction for synthesizing the hydrophilic copolymer (W2), the initiator used is a peroxide-based radical initiator, preferably di-t-butyl peroxide and di-t-amyl peroxide, and particularly preferably di-t-butyl peroxide. In the polymerization for synthesizing the hydrophobic copolymer (W1) and the polymerization for synthesizing the hydrophilic copolymer (W2), respectively, the amount of the initiator added is 2% to 10%, preferably 3% to 6%, based on the total mass of the monomers added.
The priming solvent adopted by the invention consists of alpha-methyl styrene linear dimer and organic solvent commonly used in the coating industry, and the content of the organic solvent is preferably 0.5-5% of the total weight of the dispersoid. The organic solvent may be selected, for example, from one or more of mineral spirits, butyl glycol, butyl propylene glycol, butyl diethylene glycol and methyl propylene glycol.
Preferably, the (meth) acrylate having a C1-C22 hydrocarbon group in the alcohol moiety in the present invention is preferably an esterification product of acrylic acid or methacrylic acid with a C1-C18 alcohol, more preferably one or more selected from the group consisting of methyl methacrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, n-butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, isooctyl acrylate, isobornyl acrylate and isobornyl methacrylate;
the vinyl aromatic compound is selected from vinyl benzene, more preferably styrene and/or alpha-methyl styrene;
the vinyl ester is an esterification product of vinyl alcohol and aliphatic carboxylic acid, and is selected from one or more of vinyl acetate, vinyl propionate and vinyl butyrate;
preferably, the (meth) acrylates having C1 to C22 hydrocarbon groups in the alcohol moiety are each independently selected from one or more of styrene, isooctyl acrylate, isobornyl methacrylate, isobornyl acrylate, cyclohexyl acrylate and cyclohexyl methacrylate; further preferred is one or more selected from styrene, isooctyl acrylate and isobornyl methacrylate.
The hydroxy-functional monomer or derivative thereof comprises one or more of 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate and 4-hydroxybutyl methacrylate, 6-hydroxyhexyl acrylate.
The acid functional monomer or its derivative is selected from one or more of a sulfonic acid group-containing radical polymerizable monomer, a carboxylic acid group-containing radical polymerizable monomer, a phosphonate salt-containing radical polymerizable monomer, a phosphate salt-containing radical polymerizable monomer, a sulfonate salt-containing radical polymerizable monomer, a dibasic acid monoalkyl ester and a dibasic acid anhydride monoalkyl ester, and is more preferably selected from a carboxylic acid group-containing radical polymerizable monomer; the free-radically polymerizable monomers with carboxylic acid groups are preferably selected from acrylic acid and/or methacrylic acid.
Preferably, the neutralizing agent in the invention comprises one or more of ammonia water, sodium hydroxide, triethanolamine and N, N-dimethylethanolamine, and the neutralization degree is 80-120%.
The dispersion according to the invention has a solids content of 30% to 60% by weight, based on the total weight of the dispersion, and an organic solvent content of 0.5% to 5% by weight, based on the total weight of the dispersion.
Further, the amount of water in the aqueous dispersion is such that the solids content of the dispersion is 30-60%, preferably 40-50% by weight of the total dispersion.
A second aspect of the present invention relates to a low-solvent, room temperature fast-drying dispersion of hydroxyacrylic acid prepared by the above process.
The hydroxyl value of the hydroxyl acrylic resin is 30-180mg KOH/g.
The glass transition Temperature (TG) of the hydroxyl acrylic resin is 30-80 ℃.
The invention further provides application of the low-solvent room-temperature quick-drying type hydroxyl acrylic acid dispersoid in the aspect of water-based paint, is particularly suitable for being matched with a water-based isocyanate curing agent to be applied to the field of woodware, and realizes preparation of room-temperature quick-drying type finish paint with high hardness, high gloss and high fullness.
Detailed Description
Embodiments of the invention are illustrated in detail by the following examples in which all viscosities are measured using a rotary viscometer model Bohler fly DV1, USA, rotor 63, torque 75-80%, test temperature 25 ℃; all particle sizes were measured using a Malvern Nano-ZS90 particle sizer, UK, at a test temperature of 25 ℃; all OH contents are based on the theoretical content of solids; all gloss levels were determined on Leneta cardboard using GB/T9754-2007 standard; all pencil hardness is measured on a glass substrate by adopting GB/T6739-2006, and the test standard is the hardness after 7 d; all the surface drying time adopts the time that no sticking occurs when the hands are pressed; however, the present invention is not limited to the following examples.
Description of the symbols:
pnb: propylene glycol monobutyl ether.
DMEA: n, N-dimethylethanolamine.
DTBP: di-tert-butyl peroxide.
The contents described in the examples are all mass contents.
Example 1:
30g of Pnb and 50g of alpha-methylstyrene linear dimer are added together into a 1L reactor containing a heating device, a condensing device and a stirring device and heated to 140 ℃, and the following monomer mixture is uniformly added dropwise when the initial material is heated to 140 ℃: 80g of butyl methacrylate, 50g of butyl acrylate, 115g of hydroxyethyl methacrylate, 82g of styrene, 40g of methyl methacrylate and 10g of DTBP were added dropwise over a period of about 4 hours, and the temperature was maintained at this temperature for 1 hour after the addition of the monomer mixture. The following monomer mixture was then added dropwise uniformly: 40g of methyl methacrylate, 15g of butyl acrylate, 30g of hydroxyethyl methacrylate, 12g of acrylic acid and 2.5g of DTBP, the dropping time is about 1 hour, the temperature is kept for 1 hour after the monomer mixture is dropped, 14.8g N, N-dimethylethanolamine is added and stirred for 20 minutes, and then 580g of warm water dispersion with the temperature of 40 ℃ is used for dispersing for 1 hour to obtain a hydroxyacrylic acid dispersion product. The dispersion had an OH content of 3.6%, an acid value of 18mg KOH/g, a solids content of 45%, a dispersion viscosity of 2300mPa.s, a degree of neutralization of 100%, a pH of 8.57, an average particle size of 70nm and a solvent content of 2.5%.
Example 2:
adding 10g of Pnb and 60g of alpha-methylstyrene linear dimer into a 1L reactor containing a heating device, a condensing device and a stirring device, heating to 140 ℃, and uniformly dropwise adding the following monomer mixture when the initial material is heated to 140 ℃: 80g of butyl methacrylate, 50g of butyl acrylate, 115g of hydroxyethyl methacrylate, 82g of styrene, 40g of methyl methacrylate and 10g of DTBP were added dropwise over a period of about 4 hours, and the temperature was maintained at this temperature for 1 hour after the addition of the monomer mixture. The following monomer mixture was then added dropwise uniformly: 40g of methyl methacrylate, 15g of butyl acrylate, 25g of hydroxyethyl methacrylate, 5g of styrene, 12g of acrylic acid and 2.5g of DTBP, the dropping time is about 1 hour, the temperature is kept for 1 hour at the temperature after the monomer mixture is dropped, then 14.8g N, N-dimethylethanolamine is added for stirring for 20 minutes, and then 600g of warm water dispersion with the temperature of 40 ℃ is used for dispersing for 1 hour to obtain a hydroxyacrylic acid dispersion product. The OH content of the dispersion was 3.5%, the acid value was 18mg KOH/g, the solids content was 45%, the dispersion viscosity was 3200mPa.s, the degree of neutralization was 100%, the pH was 7.98, the average particle size was 78nm, and the solvent content was 0.8%.
Example 3:
30g of Pnb and 30g of alpha-methylstyrene linear dimer are added together into a 1L reactor containing a heating device, a condensing device and a stirring device and heated to 140 ℃, and the following monomer mixture is uniformly added dropwise when the initial material is heated to 140 ℃: 100g of butyl methacrylate, 60g of butyl acrylate, 115g of hydroxyethyl methacrylate, 70g of styrene, 20g of methyl methacrylate and 13g of DTBP were added dropwise over a period of about 4 hours, and the temperature was maintained at this temperature for 1 hour after the addition of the monomer mixture. The following monomer mixture was then added dropwise uniformly: 50g of methyl methacrylate, 10g of butyl acrylate, 30g of hydroxyethyl methacrylate, 12g of acrylic acid and 3g of DTBP, the dropping time is about 1 hour, after the monomer mixture is dropped, the temperature is kept for 1 hour at the temperature, 14.8g N of N-dimethylethanolamine is added for stirring for 20 minutes, and then 600g of warm water dispersion with the temperature of 40 ℃ is used for dispersing for 1 hour to obtain a hydroxyacrylic acid dispersion product. The dispersion had an OH content of 3.5%, an acid value of 18mg KOH/g, a solids content of 45%, a dispersion viscosity of 2503mPa.s, a degree of neutralization of 100%, a pH of 8.63, an average particle size of 85nm and a solvent content of 2.5%.
Example 4:
37g of Pnb and 31g of alpha-methylstyrene linear dimer are added together into a 1L reactor containing a heating device, a condensing device and a stirring device and heated to 142 ℃, and the following monomer mixture is uniformly added dropwise when the initial material is heated to 140 ℃: 210g of butyl methacrylate, 178g of hydroxyethyl methacrylate, 74g of styrene, 58g of methyl methacrylate and 23g of DTBP were added dropwise over a period of about 4 hours, and the monomer mixture was allowed to stand at this temperature for 1 hour after the addition of the monomer mixture. The following monomer mixture was then added dropwise uniformly: 51g of methyl methacrylate, 42g of butyl acrylate, 38g of hydroxyethyl methacrylate, 11g of acrylic acid and 3g of DTBP, the dropping time is about 1 hour, the monomer mixture is kept warm for 1 hour at the temperature after the dropping is finished, 20g N N-dimethylethanolamine is added and stirred for 20 minutes, and then 800g of warm water dispersion with the temperature of 40 ℃ is used for dispersing for 1 hour to obtain a hydroxyacrylic acid dispersion product. The dispersion had an OH content of 4.0%, an acid value of 13mg KOH/g, a solids content of 44.5%, a dispersion viscosity of 1968mPa.s, a degree of neutralization of 100%, a pH of 8.89, an average particle size of 115nm and a solvent content of 2.6%.
Comparative example 1:
30g of Pnb, 50g E10p are added together into a 1L reactor comprising a heating device, a condensing device and a stirring device and heated to 140 ℃ and the following monomer mixture is added dropwise uniformly when the initial charge is heated to 140 ℃: 80g of butyl methacrylate, 10g of butyl acrylate, 90g of hydroxyethyl methacrylate, 20.1g of acrylic acid, 82g of styrene, 40g of isobornyl methacrylate and 10g of DTBP, the dropping time is about 4 hours, and the temperature is kept for 1 hour at the temperature after the monomer mixture is dropped. The following monomer mixture was then added dropwise uniformly: 40g of methyl methacrylate, 35g of butyl acrylate, 20g of hydroxyethyl methacrylate, 12g of acrylic acid and 2.5g of DTBP, the dropping time is about 1 hour, the temperature is kept for 1 hour after the monomer mixture is dropped, 14.8g N, N-dimethylethanolamine is added and stirred for 20 minutes, and then 580g of warm water dispersion with the temperature of 40 ℃ is used for dispersing for 1 hour to obtain the acrylic acid dispersion product. The dispersion had an OH content of 3.53%, an acid value of 18mg KOH/g, a solids content of 45%, a dispersion viscosity of 4300mPa.s, a degree of neutralization of 100%, a pH of 8.65, an average particle size of 98nm and a solvent content of 2.6%.
Performance evaluation
In order to examine the paint film properties of the hydroxy acrylic dispersions prepared, the dispersions of the examples were prepared as a coating composition according to the following formulation ratios, dispersed by hand stirring, bar-coated with a 150nm film on Leneta cardboard and glass plates, carbon steel plates and tinplate plates, cured at room temperature and tested for properties.
The coating components were composed in the amounts given in parts by weight, NCO/OH 1.5.
Wherein the curing agent component is
270/PGDA＝80/20。
Paint film performance:
from the above results, the low-solvent hydroxyacrylic acid dispersion prepared by the invention has better pencil hardness, pendulum rod hardness, indentation resistance and faster surface drying speed under the condition of having equivalent gloss performance compared with the low-solvent hydroxyacrylic acid dispersion prepared by the comparative example method.
The above embodiments are only preferred embodiments of the present invention, but not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents and are included in the scope of the present invention.
Claims (19)
1. A method for preparing a low-solvent, room-temperature fast-drying dispersion of hydroxyacrylic acid, comprising the steps of:
synthesizing a hydrophobic structure copolymer (W1) by polymerizing the following raw materials by radical polymerization in the presence of an α -methylstyrene linear dimer as a primer solvent and an organic solvent:
(meth) acrylates and/or vinylaromatic compounds and/or vinyl esters having C1-C22 hydrocarbon radicals in the alcohol moiety: 20 to 80 weight percent of the total weight of the mixture,
a hydroxy-functional monomer or derivative thereof: 20 to 80 weight percent of the total weight of the mixture,
the wt% being based on the total mass of the above two monomers,
then, the following raw materials were further added in the presence of the hydrophobic structure copolymer (W1) and polymerized to synthesize a hydrophilic structure copolymer (W2):
(meth) acrylates and/or vinylaromatic compounds and/or vinyl esters having C1-C22 hydrocarbon radicals in the alcohol moiety: 18 to 80 weight percent of the total weight of the mixture,
a hydroxy-functional monomer or derivative thereof: 18 to 80 weight percent of the total weight of the mixture,
acid functional monomers or derivatives thereof: 2 to 16 weight percent of the total weight of the mixture,
the wt% is based on the total mass of the above three monomers,
finally neutralizing by a neutralizing agent, and dispersing in water to obtain a low-solvent and room-temperature quick-drying hydroxy acrylic acid dispersion;
the solid content in the dispersion is 30-60% of the total weight of the dispersion, and the organic solvent content in the dispersion is 0.5-5% of the total weight of the dispersion;
the alpha-methyl styrene linear dimer accounts for 5-20% of the total mass of the monomers used to synthesize the hydrophobic structure copolymer (W1).
2. The production method according to claim 1, wherein the hydrophobic structure copolymer (W1) is synthesized by polymerizing the following raw materials by radical polymerization:
(meth) acrylates and/or vinylaromatic compounds and/or vinyl esters having C1-C22 hydrocarbon radicals in the alcohol moiety: 45 to 70wt%,
a hydroxy-functional monomer or derivative thereof: 30 to 55wt% of a binder,
the wt% is based on the total mass of the two monomers;
then, the following raw materials were further added in the presence of the hydrophobic structure copolymer (W1) and polymerized to synthesize a hydrophilic structure copolymer (W2):
(meth) acrylates and/or vinylaromatic compounds and/or vinyl esters having C1-C22 hydrocarbon radicals in the alcohol moiety: 45 to 70wt%,
a hydroxy-functional monomer or derivative thereof: 26 to 50wt%,
acid functional monomers or derivatives thereof: 4 to 14wt% of a binder,
the wt% is based on the total mass of the above three monomers;
the solids content of the dispersion is 40-50% of the total weight of the dispersion.
3. The method according to claim 1, wherein the alpha-methylstyrene linear dimer constitutes 5% to 10% by mass of the total monomers used for synthesizing the hydrophobic copolymer (W1).
4. The production method according to any one of claims 1 to 3, wherein the organic solvent used as a priming solvent occupies 1 to 15% of the total mass of the monomers for synthesizing the hydrophobic structure copolymer (W1).
5. The production method according to claim 4, wherein the organic solvent used as a primer solvent accounts for 2 to 10% of the total mass of the monomers for synthesizing the hydrophobic structure copolymer (W1).
6. The production method according to any one of claims 1 to 3, wherein in the polymerization for synthesizing the hydrophobic structure copolymer (W1) and the polymerization for synthesizing the hydrophilic structure copolymer (W2), the polymerization temperature is 80 to 160 ℃.
7. The method according to claim 6, wherein the polymerization temperature in the polymerization for synthesizing the hydrophobic copolymer (W1) and the polymerization for synthesizing the hydrophilic copolymer (W2) is 130 to 150 ℃.
8. The production method according to any one of claims 1 to 3, wherein in the synthesis of the hydrophobic copolymer (W1), the monomers are added dropwise over a period of 2.0 to 5.0 hours, and the temperature is maintained for 0.5 to 2.0 hours after completion of the dropwise addition; and/or
In the synthesis of the hydrophilic copolymer (W2), the monomer is added in a dropwise manner, the dropwise addition time of the monomer is 0.5-2.0 hours, and the temperature is kept for 0.5-2.0 hours after the dropwise addition is finished.
9. The production method according to any one of claims 1 to 3, wherein the ratio of the total mass of monomers added when synthesizing the hydrophobic structural copolymer (W1) to the total mass of monomers added when synthesizing the hydrophilic structural copolymer (W2) is 1: 0.1 to 0.8.
10. The production method according to claim 9, wherein the ratio of the total mass of monomers added when synthesizing the hydrophobic structure copolymer (W1) to the total mass of monomers added when synthesizing the hydrophilic structure copolymer (W2) is 1: 0.2 to 0.6.
11. The production method according to any one of claims 1 to 3, wherein the initiator used in the polymerization for synthesizing the hydrophobic copolymer (W1) and the polymerization for synthesizing the hydrophilic copolymer (W2) is a peroxide-based radical initiator, and the amount of the initiator added in the polymerization for synthesizing the hydrophobic copolymer (W1) and the polymerization for synthesizing the hydrophilic copolymer (W2) is 2 to 10% by mass based on the total mass of the monomers added, respectively.
12. The production method according to claim 11, wherein the amount of the initiator added in the polymerization for synthesizing the hydrophobic structure copolymer (W1) and the polymerization for synthesizing the hydrophilic structure copolymer (W2) is 3 to 6% by mass based on the total mass of the monomers added.
13. The production method according to any one of claims 1 to 3, wherein the (meth) acrylate having a C1-C22 hydrocarbon group in the alcohol moiety is an esterification product of acrylic acid or methacrylic acid with a C1-C18 alcohol;
the vinyl aromatic compound is selected from vinyl benzene;
the vinyl ester is an esterification product of vinyl alcohol and aliphatic carboxylic acid, and is selected from one or more of vinyl acetate, vinyl propionate and vinyl butyrate;
the hydroxy-functional monomer or its derivative comprises one or more of 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate and 4-hydroxybutyl methacrylate, 6-hydroxyhexyl acrylate;
the acid functional monomer or derivative thereof is selected from one or more of a radically polymerizable monomer with a sulfonic acid group, a radically polymerizable monomer with a carboxylic acid group, a radically polymerizable monomer with a phosphonate, a radically polymerizable monomer with a phosphate, a radically polymerizable monomer with a sulfonate, a monoalkyl ester of a dibasic acid, and a monoalkyl ester of a dibasic anhydride.
14. The production method according to claim 13, wherein the (meth) acrylate having a C1-C22 hydrocarbon group in the alcohol moiety is one or more selected from the group consisting of methyl methacrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, n-butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, isooctyl acrylate, isobornyl acrylate and isobornyl methacrylate;
the vinyl aromatic compound is styrene and/or alpha-methyl styrene;
the acid functional monomer or derivative thereof is selected from free radically polymerizable monomers having a carboxylic acid group.
15. The production method according to claim 14, wherein the (meth) acrylic esters having a C1-C22 hydrocarbon group in the alcohol moiety are each independently selected from one or more of isooctyl acrylate, isobornyl methacrylate, isobornyl acrylate, cyclohexyl acrylate, and cyclohexyl methacrylate.
16. The production method according to claim 14, wherein each of the (meth) acrylates having a C1-C22 hydrocarbon group in the alcohol moiety is independently selected from one or more of isooctyl acrylate and isobornyl methacrylate;
the free radical polymerizable monomer with a carboxylic acid group is selected from acrylic acid and/or methacrylic acid.
17. The production method according to any one of claims 1 to 3, wherein the neutralizing agent comprises one or more of ammonia, sodium hydroxide, triethanolamine, N-dimethylethanolamine.
18. A low-solvent, room temperature fast-drying hydroxyacrylic acid dispersion prepared by the preparation process according to any one of claims 1 to 17.
19. Use of the low-solvent, room temperature fast-drying hydroxyacrylic acid dispersion according to claim 18 for aqueous coating applications.
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