CN110144029B - Water-based acrylic resin with hardness and toughness for water-based wood paint and preparation method thereof - Google Patents
Water-based acrylic resin with hardness and toughness for water-based wood paint and preparation method thereof Download PDFInfo
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- CN110144029B CN110144029B CN201910506076.4A CN201910506076A CN110144029B CN 110144029 B CN110144029 B CN 110144029B CN 201910506076 A CN201910506076 A CN 201910506076A CN 110144029 B CN110144029 B CN 110144029B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
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- 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
- C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/04—Macromolecular 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
- C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
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- C09D—COATING 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
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/003—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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Abstract
The invention relates to the technical field of aqueous wood lacquer, in particular to aqueous acrylic resin with hardness and toughness for aqueous wood lacquer and a preparation method thereof, wherein the aqueous acrylic resin is prepared from the following components, by weight, 48-60% of water, 30-50% of a resin material monomer, 0.1-0.3% of a normal-temperature cross-linking agent, 0.7-1.1% of an emulsifier, 0.1-0.3% of an aqueous initiator and 0.1-0.3% of a neutralizer, wherein the resin material monomer is composed of the acrylic monomer and a (methyl) acrylate monomer according to any proportion, the resin has hardness and toughness, the initiator at a seed resin material stage is added in the preparation method operation, and the initiator at a core resin material stage is removed.
Description
Technical Field
The invention relates to the technical field of waterborne wood lacquer, in particular to waterborne acrylic resin for waterborne wood lacquer with hardness and toughness and a preparation method thereof.
Background
The waterborne acrylic resin material takes water as a dispersion medium, and can be better applied to waterborne wood paint, so that the waterborne wood paint has the advantages of high hardness, high gloss, no environmental pollution, excellent water resistance and the like, and is popular with people.
In practical application, in order to ensure high hardness and excellent water resistance of the aqueous wood paint, the toughness of the aqueous wood paint is often poor, so that the problems that the curved surface of the paint surface is easy to crack after the paint film is formed, the paint surface formed by spraying at an extreme temperature is easy to crack and the paint surface is rough are caused, and the popularization and the application of the aqueous wood paint are limited. In contrast, the prior art improves the waterborne acrylic resin material in waterborne wood paint. However, in the prior art, a post-stage material is mainly added into the water-based acrylic resin to modify the water-based acrylic resin, so that the film forming property of the water-based wood paint is improved.
Although the mode can improve the film forming property of the aqueous woodenware paint, the following problems still exist: the addition of the later-stage materials needs to use aqueous polyurethane, and the aqueous polyurethane contains partial solvents which are easy to volatilize, so that the environmental protection performance of the paint is reduced; in addition, the addition of the latter-stage material requires the use of other resins, and also causes an increase in various costs.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the environment-friendly water-based acrylic resin material with hardness and toughness and the preparation method thereof.
In order to achieve one of the above purposes, the invention provides the following technical scheme:
the water-based acrylic resin for the water-based wood lacquer with hardness and toughness is prepared from the following components in percentage by weight:
48 to 58 percent of water
30-50% of resin material monomer
0.1 to 0.3 percent of normal temperature crosslinking agent
0.7 to 1.1 percent of emulsifier
0.1 to 0.3 percent of water-based initiator
0.1 to 0.3 percent of neutralizer
The resin material monomer is composed of the acrylic monomer and the (methyl) acrylic monomer according to any proportion.
Wherein the acrylic monomer is one of acrylic acid monomer or methacrylic acid monomer or a mixture of more than two of the acrylic acid monomer or the methacrylic acid monomer.
The (methyl) acrylate monomer comprises any one or a mixture of more than two of various monomers of methyl (methyl) acrylate, butyl (methyl) acrylate, 2-ethylhexyl (methyl) acrylate, octyl (methyl) acrylate, 2-hydroxyethyl (methyl) acrylate, 2-hydroxypropyl (methyl) acrylate and lauryl (methyl) acrylate.
Wherein the normal temperature cross-linking agent is one or a mixture of more than two of HEAA, HDDA, NMA, AAEM, DAAM and ADH.
The emulsifier is a compound emulsifier formed by mixing an anionic emulsifier, a reactive anionic emulsifier and a non-ionic emulsifier, so that free radicals form a stable dispersion system, more free radicals can be formed conveniently, and the particle size of resin particles is reduced.
Wherein the aqueous initiator is a peroxide metal salt initiator. The peroxide metal salt initiator is potassium persulfate or ammonium persulfate.
Wherein the neutralizing agent is any one or a mixture of more than two of sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonia water, diethanolamine and triethanolamine.
To achieve the second purpose, the present invention provides the following technical solutions
The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness comprises the following steps:
step one, weighing materials
Weighing a formula amount of water-based initiator, and dividing the water-based initiator into a water-based initiator A, a water-based initiator B and a water-based initiator C, wherein the weight ratio of the water-based initiator A to the water-based initiator B to the water-based initiator C is as follows: 0.5-0.6: 0.3-0.4: 0.1-0.2;
weighing a resin material monomer according to a formula ratio, and dividing the resin material monomer into a first resin material and a second shell resin material, wherein the weight ratio of the first resin material to the second shell resin material is 4: 5-7, the first resin material is divided into a seed resin material and a core resin material, the weight ratio of the seed resin material to the core resin material is 0.2-0.5: 1.5, and the second resin material is a shell resin material;
step two, preparing the water-based acrylic resin material
(1) Weighing deionized water and an emulsifier according to a formula ratio respectively, adding the deionized water and the emulsifier into a reactor provided with a reflux condensing device, stirring materials in the reactor, introducing nitrogen into the reactor, heating the reactor, adding a water-based initiator A into the reactor when the temperature of the materials rises to 70-80 ℃, stirring for reaction for 4-6 min, adding a seed resin material, continuing stirring for reaction, and carrying out heat preservation reaction for 30-40 min when a light blue color appears in a system to obtain seed resin;
(2) dripping a nuclear resin material into the prepared seed resin, keeping the temperature of the system at 70-75 ℃, and preserving the heat for 40-60 min to obtain seeds and the nuclear resin;
(3) and (2) simultaneously dripping a shell resin material and a water-based initiator B into the prepared seed and core resin, after finishing dripping the shell resin material and the water-based initiator B, dripping a water-based initiator C, keeping the temperature of the system at 70-75 ℃, keeping the temperature for 40-60 min, heating to 80-85 ℃, continuously reacting for 50-60 min, then cooling to 30-50 ℃, adding a neutralizing agent into the material in the reactor to enable the pH value of the system to be 8.0-9.0, then discharging, and enabling the material to pass through a filter cloth to obtain the water-based acrylic resin with hardness and toughness.
Wherein the seed resin material and the core resin material are formed by mixing methyl methacrylate, butyl acrylate and isooctyl acrylate; the shell resin material is formed by mixing methyl methacrylate, butyl acrylate, isooctyl methacrylate, hydroxyethyl methacrylate, methacrylic acid and acrylic acid.
The invention has the beneficial effects that:
(1) the waterborne acrylic resin with hardness and toughness for the waterborne wood lacquer is prepared from water, a resin material monomer (composed of the acrylic monomer and a (methyl) acrylate monomer according to any proportion), a normal-temperature cross-linking agent, an emulsifier, a waterborne initiator and a neutralizing agent according to a formula amount, so that the hardness and the glossiness of the waterborne acrylic resin are ensured, and the waterborne acrylic resin only comprises the acrylic resin and does not contain other resins, so that the problem of VOC (volatile organic compound) emission caused by the addition of other resins is avoided, and the environmental protection performance of the waterborne acrylic resin is ensured.
(2) Compared with the prior art, the preparation method of the waterborne acrylic resin for the waterborne wood lacquer with hardness and toughness increases the adding amount of the waterborne initiator at the seed resin material stage, removes the adding of the waterborne initiator at the core resin material stage, can improve the introduction degree at the seed resin material stage, increases the number of resin free radicals, increases the number of seed resin material particles, reduces the particle size of the seed resin material particles, increases the number of integral microscopic particles of the waterborne acrylic resin, not only enables the surface arrangement of the waterborne acrylic resin to be more compact to ensure the hardness of the waterborne acrylic resin, but also improves the toughness of the waterborne acrylic resin, and further avoids the problem that a paint film is cracked due to over hardness in the prior art.
(3) According to the preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness, disclosed by the invention, the water-based acrylic resin can have hardness and toughness by adjusting the feeding sequence, and compared with a mode of improving the toughness of the water-based acrylic resin in the prior art, the preparation method not only saves production procedures, but also saves materials and is beneficial to improving production benefits.
(4) The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness is easy to operate and suitable for large-scale production and application.
Detailed Description
The present invention will be described in detail with reference to specific examples.
In order to reduce the production steps, the purchased raw materials are directly used in the examples, wherein the raw materials of the following commercial numbers are preferably used, and of course, other raw materials of commercial numbers can be used if necessary, as long as the finishing paint of the present application can be prepared.
TABLE 1 raw material name, trade name and corresponding composition
Example 1
The water-based acrylic resin for the water-based wood lacquer with hardness and toughness is prepared from the following components in percentage by weight: 48% of water, 50% of resin material monomer, 0.3% of normal temperature crosslinking agent, 1.1% of emulsifier, 0.3% of water-based initiator and 0.3% of neutralizing agent.
The resin material monomer is composed of the acrylic monomer and the (methyl) acrylic monomer according to any proportion.
In this embodiment, the acrylic monomer is one of an acrylic monomer and a methacrylic monomer, or a mixture of two or more thereof.
In this embodiment, the (meth) acrylate monomer includes a mixture of methyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and lauryl (meth) acrylate.
In this embodiment, the normal temperature crosslinking agent is a mixture of HEAA, HDDA, NMA, AAEM, DAAM, and ADH.
In this embodiment, the emulsifier is a compound emulsifier formed by mixing an anionic emulsifier, a reactive anionic emulsifier and a nonionic emulsifier, so that the free radicals form a stable dispersion system, thereby facilitating formation of more free radicals and reducing the particle size of the resin particles.
In this example, the aqueous initiator is a peroxide metal salt initiator. The peroxide metal salt initiator is potassium persulfate.
In this embodiment, the neutralizer is a mixture of sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonia, diethanolamine, and triethanolamine.
The preparation method of the water-based acrylic resin with hardness and toughness for the water-based wood lacquer comprises the following steps:
step one, weighing materials
Weighing a formula amount of water-based initiator, and dividing the water-based initiator into a water-based initiator A, a water-based initiator B and a water-based initiator C, wherein the weight ratio of the water-based initiator A to the water-based initiator B to the water-based initiator C is as follows: 0.5:0.3: 0.1;
weighing a resin material monomer according to a formula ratio, and dividing the resin material monomer into a first resin material and a second shell resin material, wherein the weight ratio of the first resin material to the second shell resin material is 4:5, the first resin material is divided into a seed resin material and a core resin material, the weight ratio of the seed resin material to the core resin material is 0.2:1.5, and the second resin material is a shell resin material;
step two, preparing the water-based acrylic resin material
(1) Respectively weighing deionized water and an emulsifier with a formula amount, adding the deionized water and the emulsifier into a reactor provided with a reflux condensing device, stirring materials in the reactor, introducing nitrogen into the reactor, heating the reactor, adding a water-based initiator A into the reactor when the temperature of the materials rises to 70 ℃, stirring for reacting for 4min, adding a seed resin material, continuing stirring for reacting, and preserving heat for reacting for 30min when a light blue color appears in a system to obtain seed resin;
(2) dripping nuclear resin material into the prepared seed resin, keeping the system temperature at 70 ℃, and preserving the temperature for 40min to obtain seeds and nuclear resin;
(3) and (2) simultaneously dripping a shell resin material and a water-based initiator B into the prepared seed and core resin, after finishing dripping the shell resin material and the water-based initiator B, dripping a water-based initiator C, keeping the temperature of the system at 70 ℃, keeping the temperature for 40min, heating to 80 ℃, continuing to react for 50min, then cooling to 30 ℃, adding a neutralizing agent into the material in the reactor to enable the pH value of the system to be 8.0, discharging, and enabling the material to pass through filter cloth to obtain the water-based acrylic resin with hardness and toughness.
In this embodiment, the seed resin material and the core resin material are formed by mixing methyl methacrylate, butyl acrylate and isooctyl acrylate; the shell resin material is formed by mixing methyl methacrylate, butyl acrylate, isooctyl methacrylate, hydroxyethyl methacrylate, methacrylic acid and acrylic acid.
Example 2.
The water-based acrylic resin for the water-based wood lacquer with hardness and toughness is prepared from the following components in percentage by weight: 60% of water, 40% of resin material monomer, 0.1% of normal temperature crosslinking agent, 0.7% of emulsifier, 0.1% of water-based initiator and 0.1% of neutralizing agent.
The resin material monomer is composed of the acrylic monomer and the (methyl) acrylic monomer according to any proportion.
In this embodiment, the acrylic monomer is one of an acrylic monomer and a methacrylic monomer, or a mixture of two or more thereof.
In this embodiment, the (meth) acrylate monomer includes any one or a mixture of two or more of methyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and lauryl (meth) acrylate.
In this embodiment, the normal temperature crosslinking agent is one or a mixture of any two or more of HEAA, HDDA, NMA, AAEM, DAAM, and ADH.
In this embodiment, the emulsifier is a compound emulsifier formed by mixing an anionic emulsifier, a reactive anionic emulsifier and a nonionic emulsifier, so that the free radicals form a stable dispersion system, thereby facilitating formation of more free radicals and reducing the particle size of the resin particles.
In this example, the aqueous initiator is a peroxide metal salt initiator. The peroxide metal salt initiator is potassium persulfate or ammonium persulfate.
In this embodiment, the neutralizing agent is any one or a mixture of two or more of sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonia water, diethanolamine, and triethanolamine.
The preparation method of the water-based acrylic resin with hardness and toughness for the water-based wood lacquer comprises the following steps:
step one, weighing materials
Weighing a water-based initiator with a formula amount, and dividing the water-based initiator into a water-based initiator A, a water-based initiator B and a water-based initiator C, wherein the weight ratio of the water-based initiator A to the water-based initiator B to the water-based initiator C is 0.6:0.4: 0.2;
weighing a resin material monomer according to a formula ratio, and dividing the resin material monomer into a first resin material and a second shell resin material, wherein the weight ratio of the first resin material to the second shell resin material is 4:7, the first resin material is divided into a seed resin material and a core resin material, the weight ratio of the seed resin material to the core resin material is 0.5:1.5, and the second resin material is a shell resin material;
step two, preparing the water-based acrylic resin material
(1) Respectively weighing deionized water and an emulsifier with a formula amount, adding the deionized water and the emulsifier into a reactor provided with a reflux condensing device, stirring materials in the reactor, introducing nitrogen into the reactor, heating the reactor, adding a water-based initiator A into the reactor when the temperature of the materials rises to 80 ℃, stirring for reaction for 6min, adding a seed resin material, continuing stirring for reaction, and preserving heat for reaction for 40min when a light blue color appears in a system to obtain seed resin;
(2) dripping nuclear resin material into the prepared seed resin, keeping the system temperature at 75 ℃, and keeping the temperature for 60min to obtain seeds and nuclear resin;
(3) and (2) simultaneously dripping a shell resin material and a water-based initiator B into the prepared seed and core resin, after finishing dripping the shell resin material and the water-based initiator B, dripping a water-based initiator C, keeping the temperature of the system at 75 ℃, keeping the temperature for 60min, heating to 85 ℃, continuing to react for 60min, then cooling to 50 ℃, adding a neutralizing agent into the material in the reactor to enable the pH value of the system to be 9.0, discharging, and enabling the material to pass through filter cloth to obtain the water-based acrylic resin with hardness and toughness.
In this embodiment, the seed resin material and the core resin material are formed by mixing methyl methacrylate, butyl acrylate and isooctyl acrylate; the shell resin material is formed by mixing methyl methacrylate, butyl acrylate, isooctyl methacrylate, hydroxyethyl methacrylate, methacrylic acid and acrylic acid.
Example 3.
The water-based acrylic resin for the water-based wood lacquer with hardness and toughness is prepared from the following components in percentage by weight: 50.5 percent of water, 48 percent of resin material monomer, 0.25 percent of normal temperature crosslinking agent, 1 percent of emulsifier, 0.25 percent of water-based initiator and 0.25 percent of neutralizing agent
The resin material monomer is composed of the acrylic monomer and the (methyl) acrylic monomer according to any proportion.
In this embodiment, the acrylic monomer is one of an acrylic monomer and a methacrylic monomer, or a mixture of two or more thereof.
In this embodiment, the (meth) acrylate monomer includes any one or a mixture of two or more of methyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and lauryl (meth) acrylate.
In this embodiment, the normal temperature crosslinking agent is one or a mixture of any two or more of HEAA, HDDA, NMA, AAEM, DAAM, and ADH.
In this embodiment, the emulsifier is a compound emulsifier formed by mixing an anionic emulsifier, a reactive anionic emulsifier and a nonionic emulsifier, so that the free radicals form a stable dispersion system, thereby facilitating formation of more free radicals and reducing the particle size of the resin particles.
In this example, the aqueous initiator is a peroxide metal salt initiator. The peroxide metal salt initiator is potassium persulfate or ammonium persulfate.
In this embodiment, the neutralizing agent is any one or a mixture of two or more of sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonia water, diethanolamine, and triethanolamine.
The preparation method of the water-based acrylic resin with hardness and toughness for the water-based wood lacquer comprises the following steps:
step one, weighing materials
Weighing a formula amount of water-based initiator, and dividing the water-based initiator into a water-based initiator A, a water-based initiator B and a water-based initiator C, wherein the weight ratio of the water-based initiator A to the water-based initiator B to the water-based initiator C is as follows: 0.55:0.35: 0.15;
weighing a resin material monomer according to a formula ratio, dividing the resin material monomer into a first resin material and a second shell resin material, wherein the weight ratio of the first resin material to the second shell resin material is 4:6, the first resin material is divided into a seed resin material and a core resin material, and the weight ratio of the seed resin material to the core resin material is 0.3: 1.5, the second resin material is a shell resin material;
step two, preparing the water-based acrylic resin material
(1) Respectively weighing deionized water and an emulsifier according to a formula ratio, adding the deionized water and the emulsifier into a reactor provided with a reflux condensing device, stirring materials in the reactor, introducing nitrogen into the reactor, heating the reactor, adding a water-based initiator A into the reactor when the temperature of the materials is increased to 75 ℃, stirring for 5min, adding a seed resin material, continuing stirring for reaction, and keeping the temperature for reaction for 30-40 min when a light blue color appears in a system to obtain seed resin;
(2) dripping nuclear resin material into the prepared seed resin, keeping the system temperature at 72 ℃, and keeping the temperature for 50min to obtain seeds and nuclear resin;
(3) and (2) simultaneously dripping a shell resin material and a water-based initiator B into the prepared seed and core resin, after finishing dripping the shell resin material and the water-based initiator B, dripping a water-based initiator C, keeping the temperature of the system at 72 ℃, keeping the temperature for 50min, heating to 82 ℃, continuing to react for 55min, then cooling to 40 ℃, adding a neutralizing agent into the material in the reactor to enable the pH value of the system to be 8.5, discharging, and enabling the material to pass through filter cloth to obtain the water-based acrylic resin with hardness and toughness.
In this embodiment, the seed resin material and the core resin material are formed by mixing methyl methacrylate, butyl acrylate and isooctyl acrylate; the shell resin material is formed by mixing methyl methacrylate, butyl acrylate, isooctyl methacrylate, hydroxyethyl methacrylate, methacrylic acid and acrylic acid.
And (3) product performance testing:
1. preparing the water-based wood lacquer corresponding to the embodiment 1-3: 8kg of each of the aqueous acrylic resins obtained in examples 1 to 3 was weighed, and 0.2kg of a wetting agent, 0.2kg of a leveling agent, 0.2kg of a defoaming agent, 0.2kg of a thickener, 0.8kg of deionized water, and 0.4kg of a film-forming aid were added to the weighed aqueous acrylic resins, respectively, to obtain the aqueous wood lacquer corresponding to examples 1 to 3, wherein the sample numbers corresponding to table 2 are 1, 2, and 3.
2. Preparing the aqueous wood lacquer corresponding to the comparative example 1, adding a part of the aqueous initiator A in the example 1 into a seed resin material stage, adding the other part into a core resin material stage, and performing the same operations as the example 1 to obtain the aqueous acrylic resin prepared in the comparative example 1, meanwhile, weighing 8kg of the aqueous acrylic resin prepared in the comparative example 1, adding 0.2kg of wetting agent, 0.2kg of flatting agent, 0.2kg of defoaming agent, 0.2kg of thickening agent, 0.8kg of deionized water and 0.4kg of film-forming aid into the aqueous wood lacquer corresponding to the comparative example 1, wherein the sample number corresponding to the table 2 is 4.
3. PUA-129 was used as a sample of a conventional aqueous wood lacquer.
And respectively observing the appearance state of the prepared waterborne wood lacquer coating, coating the prepared waterborne wood lacquer coating on the redwood, wherein the thickness of the coating is 3mm, and observing the performance of the coating after 5 weeks.
Table 2, appearance state and coating properties of each aqueous wood lacquer coating.
As can be seen from table 2, the flexibility, water resistance, sanding property, and hardness of the aqueous wood lacquer prepared in examples 1 to 3 are better than those of the aqueous wood lacquer prepared in comparative example 1 and the conventional PUA, and the contamination resistance is not increased.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. A preparation method of water-based acrylic resin with hardness and toughness for water-based wood paint is characterized by comprising the following steps: the water-based acrylic resin is prepared from the following components in percentage by weight:
48 to 60 percent of water
30-50% of resin material monomer
0.1 to 0.3 percent of normal temperature crosslinking agent
0.7 to 1.1 percent of emulsifier
0.1 to 0.3 percent of water-based initiator
0.1 to 0.3 percent of neutralizer
The resin material monomer is composed of an acrylic monomer and a (methyl) acrylic monomer according to any proportion;
the sum of the weight percentages of the components in the water-based acrylic resin is 100 percent;
the preparation method of the water-based acrylic resin comprises the following steps:
step one, weighing materials
Weighing a formula amount of water-based initiator, and dividing the water-based initiator into a water-based initiator A, a water-based initiator B and a water-based initiator C, wherein the weight ratio of the water-based initiator A to the water-based initiator B to the water-based initiator C is as follows: 0.5-0.6: 0.3-0.4: 0.1-0.2;
weighing a resin material monomer according to a formula ratio, and dividing the resin material monomer into a first resin material and a second resin material, wherein the weight ratio of the first resin material to the second resin material is 4: 5-7, the first resin material is divided into a seed resin material and a core resin material, the weight ratio of the seed resin material to the core resin material is 0.2-0.5: 1.5, and the second resin material is a shell resin material;
step two, preparing the water-based acrylic resin material
(1) Respectively weighing deionized water and an emulsifier according to a formula ratio, adding the deionized water and the emulsifier into a reactor provided with a reflux condensing device, stirring materials in the reactor, introducing nitrogen into the reactor, heating the reactor, adding a water-based initiator A into the reactor when the temperature of the materials rises to 70-80 ℃, stirring and reacting for 4-6 min, and adding a seed tree
Continuously stirring the grease for reaction, and carrying out heat preservation reaction for 30-40 min when a light blue color appears in the system to obtain seed resin;
(2) dripping a nuclear resin material into the prepared seed resin, keeping the temperature of the system at 70-75 ℃, and preserving the heat for 40-60 min to obtain seeds and the nuclear resin;
(3) and (2) simultaneously dripping a shell resin material and a water-based initiator B into the prepared seed and core resin, after finishing dripping the shell resin material and the water-based initiator B, dripping a water-based initiator C, keeping the temperature of the system at 70-75 ℃, keeping the temperature for 40-60 min, heating to 80-85 ℃, continuously reacting for 50-60 min, then cooling to 30-50 ℃, adding a neutralizing agent into the material in the reactor to enable the pH value of the system to be 8.0-9.0, then discharging, and enabling the material to pass through a filter cloth to obtain the water-based acrylic resin with hardness and toughness.
2. The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness as claimed in claim 1, wherein the preparation method comprises the following steps: the acrylic monomer is one of acrylic acid monomer or methacrylic acid monomer or a mixture of more than two of the acrylic acid monomer or the methacrylic acid monomer.
3. The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness as claimed in claim 1, wherein the preparation method comprises the following steps: the (methyl) acrylate monomer comprises any one or a mixture of more than two of various monomers of methyl (methyl) acrylate, butyl (methyl) acrylate, 2-ethylhexyl (methyl) acrylate, octyl (methyl) acrylate, 2-hydroxyethyl (methyl) acrylate, 2-hydroxypropyl (methyl) acrylate and lauryl (methyl) acrylate.
4. The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness as claimed in claim 1, wherein the preparation method comprises the following steps: the normal temperature cross-linking agent is one or a mixture of more than two of HEAA, HDDA, NMA, AAEM, DAAM and ADH.
5. The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness as claimed in claim 1, wherein the preparation method comprises the following steps: the emulsifier is a compound emulsifier formed by mixing an anionic emulsifier, a reactive anionic emulsifier and a non-ionic emulsifier.
6. The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness as claimed in claim 1, wherein the preparation method comprises the following steps: the aqueous initiator is a peroxide metal salt initiator.
7. The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness as claimed in claim 6, wherein the preparation method comprises the following steps: the peroxide metal salt initiator is potassium persulfate or ammonium persulfate.
8. The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness as claimed in claim 1, wherein the preparation method comprises the following steps: the neutralizer is any one or a mixture of more than two of sodium hydroxide, potassium hydroxide, sodium bicarbonate, ammonia water, diethanolamine and triethanolamine.
9. The preparation method of the water-based acrylic resin for the water-based wood lacquer with hardness and toughness as claimed in claim 1, wherein the preparation method comprises the following steps: the seed resin material and the core resin material are formed by mixing methyl methacrylate, butyl acrylate and isooctyl acrylate; the shell resin material is formed by mixing methyl methacrylate, butyl acrylate, isooctyl methacrylate, hydroxyethyl methacrylate, methacrylic acid and acrylic acid.
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| CN1671747A (en) * | 2002-07-23 | 2005-09-21 | 可隆株式会社 | Preparation of acrylic polymer sol for coating |
| CN102199239A (en) * | 2010-03-24 | 2011-09-28 | 东莞大宝化工制品有限公司 | Preparation method for acrylic acid microemulsion with self-crosslinking core-shell structure |
| CN105254800A (en) * | 2015-11-05 | 2016-01-20 | 浩力森涂料（上海）有限公司 | Acrylate emulsion used for water-based metallic paint and preparation method thereof |
| CN106866869A (en) * | 2017-02-23 | 2017-06-20 | 同光（江苏）新材料科技有限公司 | A kind of preparation method of core shell structure hydroxyl acrylic emulsion |
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|---|---|---|---|---|
| CN1671747A (en) * | 2002-07-23 | 2005-09-21 | 可隆株式会社 | Preparation of acrylic polymer sol for coating |
| CN102199239A (en) * | 2010-03-24 | 2011-09-28 | 东莞大宝化工制品有限公司 | Preparation method for acrylic acid microemulsion with self-crosslinking core-shell structure |
| CN105254800A (en) * | 2015-11-05 | 2016-01-20 | 浩力森涂料（上海）有限公司 | Acrylate emulsion used for water-based metallic paint and preparation method thereof |
| CN106866869A (en) * | 2017-02-23 | 2017-06-20 | 同光（江苏）新材料科技有限公司 | A kind of preparation method of core shell structure hydroxyl acrylic emulsion |
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