CN111732895A - Water-based wood paint and application method thereof - Google Patents

Water-based wood paint and application method thereof Download PDF

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CN111732895A
CN111732895A CN201910226873.7A CN201910226873A CN111732895A CN 111732895 A CN111732895 A CN 111732895A CN 201910226873 A CN201910226873 A CN 201910226873A CN 111732895 A CN111732895 A CN 111732895A
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spraying
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electrostatic
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汪培书
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Dongguan Borda Industrial Co ltd
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Dongguan Borda Industrial Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • 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
    • C09D201/00—Coating compositions based on unspecified macromolecular compounds
    • C09D201/02—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • C09D201/025—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing nitrogen atoms
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

The invention is suitable for the technical field of materials, and provides an aqueous wood lacquer and an application method thereof, wherein the aqueous wood lacquer comprises a substance A and a substance B, and the substance A comprises the following components: 60-80 w% of re-emulsifiable emulsion, 3.5-15 w% of auxiliary agent, 2-25 w% of color paste and 5-15 w% of deionized water; the re-emulsifiable emulsion is a resin having the structural formula (I),
Figure RE-DDA0002078566990000011
the material B is hydrolyzed oligomer of glycidol ether oxy propyl methyl diethoxy silane. The reemulsifiable emulsion adopted by the waterborne wood lacquer provided by the embodiment of the invention contains the hydrophilic group shown in the formula (I), and the reemulsifiable emulsion is sprayed to form a filmAfter the coating film is again in water, the film-forming emulsion can be changed into emulsion particles again to be dispersed in water, so that emulsion particle accumulation is not easy to form, under the cross-linking and matching action of the substance B, the water resistance, the solvent resistance, the heat resistance and the mechanical property of the paint film are improved, the problem of spray gun blockage when electrostatic rotary cup equipment is used for spraying is solved, and the coating film is suitable for spraying of the electrostatic rotary cup equipment based on a centrifugal atomization mode.

Description

Water-based wood paint and application method thereof
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a water-based wood paint and an application method thereof.
Background
The performance of the waterborne wood lacquer is gradually improved through the rapid development in recent years, and although the appearance of the lacquer film has some gaps compared with that of a solvent type waterborne wood lacquer, the waterborne wood lacquer can be used in a large area in many occasions. In view of the fact that wood production is a traditional labor-intensive industry, a plurality of woodware coatings are still very simple and original, but along with the disappearance of population dividends and the upgrading requirements of the industry, the woodware paint is required to be clean and efficient in water-based property, the upgrading and the reconstruction of the coating link are important, a plurality of furniture factories also invest a large amount of capital for upgrading and reconstructing spraying equipment in recent years, but basically, the woodware paint is a simple mode of robot exchange, the spraying method is also a traditional spraying method in the spraying principle, the coating is atomized into fine droplets by means of different working principles and is sent to the surface of a workpiece, and at present, four atomization modes exist: air atomization, high-pressure airless atomization, mixed gas (air-assisted) atomization, and centrifugal atomization. Most of the existing furniture factories use the former three atomization modes, the most efficient centrifugal atomization is used in a large amount in the coating of automobiles and building materials, partial woodware coating experts are attracted to the most efficient centrifugal atomization, and partial factories introduce static cup rotating equipment based on the centrifugal atomization mode so as to achieve the effect of automobile coating.
However, the existing waterborne wood lacquer is difficult to centrifugally atomize due to the drying mechanism, and easily causes the problem of spray gun blockage, so that the existing waterborne wood lacquer cannot be well applied to the electrostatic spinning cup equipment based on the centrifugal atomization mode.
Disclosure of Invention
The embodiment of the invention provides water-based wood paint, and aims to solve the problems that the existing water-based wood paint is difficult to centrifugally atomize due to a drying mechanism, and easily blocks a spray gun, so that the existing water-based wood paint cannot be well applied to electrostatic spinning cup equipment based on a centrifugal atomization mode.
The embodiment of the invention is realized in such a way that the water-based wood paint comprises a substance A and a substance B;
the A substance comprises the following components: 60-80 w% of re-emulsifiable emulsion, 3.5-15 w% of auxiliary agent, 2-25 w% of color paste and 5-15 w% of deionized water;
the re-emulsifiable emulsion is a resin having the structural formula (I),
Figure RE-RE-GDA0002078566980000021
the B substance is hydrolyzed oligomer of glycidol ether oxypropyl methyl diethoxysilane.
The embodiment of the invention also provides an application method of the water-based wood paint, which comprises the following steps:
mixing the substance A and the substance B according to any one of claims 1 to 5 in a weight ratio of 9-10: 1, and filling the mixture into a liquid storage cavity of an electrostatic spinning cup device;
and adjusting the spraying electrostatic parameters of the electrostatic rotary cup equipment to a corresponding parameter range according to the spraying requirements of the sprayed workpiece, and spraying.
According to the waterborne wood lacquer provided by the embodiment of the invention, the adopted re-emulsifiable emulsion contains a large number of hydrophilic groups (shown as a formula (I)), the hydrophobic groups which are connected with the hydrophilic groups and ensure the performance of the coating film are mutually permeated and diffused, and are gradually intertwined together in the drying film-forming process, but when the coating film is again in water, the main chain of the molecular chain of the hydrophobic part is rapidly curled up, and the hydrophilic groups can wrap the hydrophobic main chain like a surfactant and become emulsion particles to be dispersed in water again, so that the accumulation is not easy to form; meanwhile, the crosslinking and curing effects of the substance B are matched, so that the water resistance, the solvent resistance, the heat resistance and the mechanical properties of a paint film are greatly improved, the problem of spray gun blockage during spraying by using electrostatic rotary cup equipment is well solved, and the spray gun is suitable for spraying by using electrostatic rotary cup equipment based on a centrifugal atomization mode.
Drawings
FIG. 1 is a schematic diagram showing the electrostatic spray filming effect of acrylic acid soap-free polymerized emulsion;
FIG. 2 is a schematic diagram of the electrostatic spray filming effect of a PUD dispersion emulsion;
FIG. 3 is a schematic diagram of the electrostatic spraying film forming effect of the re-emulsifiable emulsion according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
According to the waterborne wood lacquer provided by the embodiment of the invention, the adopted re-emulsifiable emulsion contains a large number of hydrophilic groups (shown as a formula (I)), the hydrophobic groups which are connected with the hydrophilic groups and ensure the performance of the coating film are mutually permeated and diffused, and are gradually intertwined together in the drying film-forming process, but when the coating film is again in water, the main chain of the molecular chain of the hydrophobic part is rapidly curled up, and the hydrophilic groups can wrap the hydrophobic main chain like a surfactant and become emulsion particles to be dispersed in water again, so that the accumulation is not easy to form; meanwhile, the crosslinking and curing effects of the substance B are matched, so that the water resistance, the solvent resistance, the heat resistance and the mechanical properties of a paint film are greatly improved, the problem of spray gun blockage during spraying by using electrostatic rotary cup equipment is well solved, and the spray gun is suitable for spraying by using electrostatic rotary cup equipment based on a centrifugal atomization mode.
The embodiment of the invention provides water-based wood paint which comprises a substance A and a substance B;
the A substance comprises the following components: 60-80 w% of re-emulsifiable emulsion, 3.5-15 w% of auxiliary agent, 2-25 w% of color paste and 5-15 w% of deionized water;
the re-emulsifiable emulsion is a resin having the structural formula (I),
Figure RE-RE-GDA0002078566980000041
the B substance is hydrolyzed oligomer of glycidol ether oxypropyl methyl diethoxysilane.
The re-emulsifiable emulsion contains a structure shown as a formula (I), and the structure contains a large number of hydrophilic groups including amino groups, carboxylic acid groups and the like. The hydrophilic groups can be connected with hydrophobic groups which can ensure the performance of the coating, molecular chains in the emulsion particles are mutually permeated and diffused and gradually intertwined in the process of drying and film forming, but when the coating is again in water, the molecular chain main chain of the hydrophobic part is quickly curled up, the hydrophilic groups can wrap the hydrophobic main chain like a surfactant and become emulsion particles to be dispersed in the water again, so that the emulsion can not be easily accumulated, and the spraying result is good.
Preferably, the re-emulsifiable emulsion comprises an amine neutralizer. The amine neutralizer has the functions of acid-base regulation and stabilization, can promote the gloss display of a paint film, and improves the corrosion resistance of the paint film.
Furthermore, the auxiliary agent comprises a wetting agent, a film forming auxiliary agent, a dispersing agent, a defoaming agent, a surface functional auxiliary agent, a rheological auxiliary agent and micro wax powder.
Furthermore, the auxiliary agent comprises 0.2-0.5 w% of wetting agent, 2-8 w% of film-forming auxiliary agent, 0.2-0.5 w% of dispersing agent, 0.2-1 w% of defoaming agent, 0.2-2 w% of surface functional auxiliary agent, 0.2-1 w% of rheological auxiliary agent and 0.5-2 w% of micro-powder wax.
Preferably, the material B is an oligosiloxane. The re-emulsifiable solution in the substance A can affect the resistance of the paint film due to a large amount of hydrophilic groups, and the addition of the substance B can overcome the defect and improve the resistance of the paint film.
The metal ions which can be used for carboxyl crosslinking at normal temperature comprise carbodiimides, aziridines, epoxysilanes and the like, and the crosslinking and curing can greatly improve the water resistance, solvent resistance, heat resistance and mechanical properties of a paint film, thereby further improving the film forming effect of the re-emulsifiable emulsion.
The embodiment of the invention also provides an application method of the water-based wood paint, which comprises the following steps:
mixing the substance A and the substance B according to a weight ratio of 9-10: 1, and filling the mixture into a liquid storage cavity of electrostatic spinning cup equipment;
and adjusting the spraying electrostatic parameters of the electrostatic rotary cup equipment to a corresponding parameter range according to the spraying requirements of the sprayed workpiece, and spraying.
Preferably, the substance A and the substance B are mixed according to the weight ratio of 9.75:1 and are filled into a liquid storage cavity of an electrostatic spinning cup device for use.
Further, according to the spraying requirement of the sprayed workpiece, the spraying electrostatic parameters of the electrostatic rotary cup device are adjusted to the corresponding parameter range, and then the spraying step can be carried out, and the method comprises the following steps:
and adjusting the flow, the forming air, the turbine air and the high-voltage static parameters of the electrostatic rotary cup equipment to corresponding parameter ranges according to the spraying requirements of the sprayed workpiece, and then spraying.
Preferably, according to the spraying requirement of a sprayed workpiece, the flow parameter of the electrostatic rotary cup equipment is adjusted to 150-300 cc/min, the forming air parameter is adjusted to 2-3bar, the turbine air parameter is adjusted to 2-3bar, and the high-voltage electrostatic parameter is adjusted to 30-60 KV, so that spraying can be performed.
More preferably, according to the spraying requirement of the sprayed workpiece, the flow parameter of the electrostatic rotary cup equipment is adjusted to 180cc/min, the molding air parameter is adjusted to 2bar, the turbine air parameter is adjusted to 2bar, and the high-voltage electrostatic parameter is adjusted to 50KV, so that spraying can be performed.
The spraying requirements of the workpiece include, but are not limited to, the film thickness requirements of the workpiece, the structure of the workpiece, the coating characteristics, and other conditions.
In the embodiment of the present invention, the number of the guns for the advance and delay pulses of the electrostatic spinning cup device during the spraying process can be arbitrarily adjusted and set according to the conditions such as the structure of the workpiece to be sprayed, the characteristics of the coating material, and the like, and the present invention is not limited thereto.
By adopting the aqueous wood lacquer provided by the embodiment of the invention, the woodware is coated with the film by spraying under the condition of the electrostatic spraying parameters, the phenomenon of gun blockage is not easy to occur, and the sprayed paint film is flat, has no paint accumulation, small color difference and good film forming effect.
The technical solution and the technical effect of the present invention will be further described by specific examples.
Example 1:
the water-based wood paint comprises a substance A and a substance B, wherein the substance A comprises the following components: 60 w% of re-emulsifiable emulsion, 3.5 w% of auxiliary agent (0.2 w% of wetting agent, 2 w% of film-forming auxiliary agent, 0.2 w% of dispersing agent, 0.2 w% of defoaming agent, 0.2 w% of surface functional auxiliary agent, 0.2 w% of rheological auxiliary agent and 0.5 w% of micro-powder wax), 25 w% of color paste (UTINTWNW (UCHEM super wetting)) and 10 w% of deionized water;
wherein the substance A is prepared by the following steps:
adding the emulsion into a stainless steel cylinder, slowly adding the wetting agent, the film-forming aid, the deionized water and the dispersing agent at the rotating speed of 600rmp, stirring uniformly, then sequentially adding the micro-powder wax, the defoaming agent, the surface functional aid, the rheological aid and the color paste, dispersing uniformly, and inspecting to be qualified for later use.
When the spraying agent is used, the substance A and the substance B are mixed according to the weight ratio of 9:1, the mixture is loaded into a liquid storage cavity of electrostatic rotary cup equipment, the flow rate of the electrostatic rotary cup equipment is adjusted to be 150cc/min, the molding air is 2bar, the turbine air is 2bar, and the high-voltage static electricity is 50KV, so that the spraying can be carried out.
Electrostatically sprayed wood includes, but is not limited to, wood made from fir, hardwood, shrubs, and branches and leaves thereof.
Example 2:
the water-based wood paint comprises a substance A and a substance B, wherein the substance A comprises the following components: 70 w% of re-emulsifiable emulsion, 0.5 w% of auxiliary agent (wetting agent, 8 w% of film-forming auxiliary agent, 0.5 w% of dispersing agent, 1 w% of defoaming agent, 1 w% of surface functional auxiliary agent, 0.5 w% of rheological auxiliary agent and 1 w% of micro-powder wax), 2 w% of color paste (Hostafine (Clariant Kelaine)) and 5 w% of deionized water;
wherein the substance A is prepared by the following steps:
adding the emulsion into a stainless steel cylinder, slowly adding the wetting agent, the film-forming aid, the deionized water and the dispersing agent at the rotating speed of 800rmp, stirring uniformly, then sequentially adding the micro-powder wax, the defoaming agent, the surface functional aid, the rheological aid and the color paste, dispersing uniformly, and inspecting for later use.
When the spraying agent is used, the substance A and the substance B are mixed according to the weight ratio of 10:1, the mixture is loaded into a liquid storage cavity of electrostatic rotary cup equipment, the flow rate of the electrostatic rotary cup equipment is adjusted to be 200cc/min, the molding air is 3bar, the turbine air is 3bar, and the high-voltage static electricity is 30KV, so that the spraying can be carried out.
Example 3:
the water-based wood paint comprises a substance A and a substance B, wherein the substance A comprises the following components: 80 w% of re-emulsifiable emulsion, 15 w% of auxiliary agent (0.5 w% of wetting agent, 8 w% of film-forming auxiliary agent, 0.5 w% of dispersing agent, 1 w% of defoaming agent, 2 w% of surface functional auxiliary agent, 1 w% of rheological auxiliary agent and 2 w% of micro-powder wax), 10 w% of color paste (Hostafine (Clariant Kelain)) and 15 w% of deionized water;
wherein the substance A is prepared by the following steps:
adding the emulsion into a stainless steel cylinder, slowly adding the wetting agent, the film-forming aid, the deionized water and the dispersing agent at the rotating speed of 700rmp, stirring uniformly, then sequentially adding the micro-powder wax, the defoaming agent, the surface functional aid, the rheological aid and the color paste, dispersing uniformly, and checking to be qualified for later use.
When the spraying agent is used, the substance A and the substance B are mixed according to the weight ratio of 9.5:1, the mixture is loaded into a liquid storage cavity of electrostatic rotary cup equipment, the flow rate of the electrostatic rotary cup equipment is adjusted to be 300cc/min, the molding air is 3bar, the turbine air is 2bar, and the high-voltage static electricity is 60KV, so that the spraying can be carried out.
Example 4:
the water-based wood paint comprises a substance A and a substance B, wherein the substance A comprises the following components: 65 w% of re-emulsifiable emulsion, 11 w% of auxiliary agent (0.4 w% of wetting agent, 6 w% of film-forming auxiliary agent, 0.3 w% of dispersing agent, 0.8 w% of defoaming agent, 1.5 w% of surface functional auxiliary agent, 0.5 w% of rheological auxiliary agent and 1.5 w% of micro-powder wax), 15 w% of color paste (Hostafine (Clariant Laine) and 12 w% of deionized water;
wherein the substance A is prepared by the following steps:
adding the emulsion into a stainless steel cylinder, slowly adding the wetting agent, the film-forming aid, the deionized water and the dispersing agent at the rotating speed of 750rmp, stirring uniformly, then sequentially adding the micro-powder wax, the defoaming agent, the surface functional aid, the rheological aid and the color paste, dispersing uniformly, and checking to be qualified for later use.
When the spraying agent is used, the substance A and the substance B are mixed according to the weight ratio of 9.75:1, the mixture is loaded into a liquid storage cavity of electrostatic rotary cup equipment, the flow rate of the electrostatic rotary cup equipment is adjusted to be 180cc/min, the molding air is 2bar, the turbine air is 3bar, and the high-voltage static electricity is 40KV, so that the spraying can be carried out.
Example 5:
the water-based wood paint comprises a substance A and a substance B, wherein the substance A comprises the following components: 75 w% of re-emulsifiable emulsion, 9.7 w% of auxiliary agent (0.3 w% of wetting agent, 5 w% of film-forming auxiliary agent, 0.4 w% of dispersing agent, 0.5 w% of defoaming agent, 1.2 w% of surface functional auxiliary agent, 0.8 w% of rheological auxiliary agent and 1.5 w% of micro-powder wax), 20 w% of color paste (Hostafine (Clariant Kelaine)) and 8 w% of deionized water;
wherein the substance A is prepared by the following steps:
adding the emulsion into a stainless steel cylinder, slowly adding the wetting agent, the film-forming aid, the deionized water and the dispersing agent at the rotating speed of 800rmp, stirring uniformly, then sequentially adding the micro-powder wax, the defoaming agent, the surface functional aid, the rheological aid and the color paste, dispersing uniformly, and inspecting for later use.
When the spraying agent is used, the substance A and the substance B are mixed according to the weight ratio of 9.75:1, the mixture is loaded into a liquid storage cavity of electrostatic rotary cup equipment, the flow rate of the electrostatic rotary cup equipment is adjusted to be 180cc/min, the molding air is 2bar, the turbine air is 2bar, and the high-voltage static electricity is 50KV, so that the spraying can be carried out.
To further illustrate the technical effects of the present invention, the following detailed description is provided for the properties of the waterborne wood lacquer provided by the embodiment of the present invention:
high-speed emulsion centrifugation simulation experiment
When the turbine air of the electrostatic spinning cup reaches 2-3bar, the rotating speed of the spinning cup can reach 1-2 ten thousand revolutions per minute, so whether emulsion breaking is carried out on the emulsion under the action of high shearing force is a key factor influencing the performance of a paint film formed after spraying.
Test samples: the re-emulsifiable emulsion provided in the embodiments 1 to 3 of the present invention; commercially available 3 self-crosslinking emulsions, 3 soap-free polymeric emulsions and 3 PUD dispersions.
The test method comprises the following steps: equal amounts of the test samples are respectively added into clean and dry centrifuge tubes and are respectively numbered 1-12, wherein the numbers 1-3 are respectively re-emulsifiable emulsions provided by the embodiments 1-3 of the invention, the numbers 4-6 are respectively 3 commercially available self-crosslinking emulsions, the numbers 7-9 are respectively 3 commercially available soap-free polymeric emulsions, and the numbers 10-12 are respectively 3 commercially available PUD dispersions. And (3) carrying out a 20-minute centrifugation experiment on different emulsions and color pastes on a 12000rpm high-speed centrifuge, and checking whether the sample in the test tube is uniformly suspended, layered or precipitated. The results of the tests are detailed in table 1 below.
TABLE 1
Figure RE-RE-GDA0002078566980000081
Figure RE-RE-GDA0002078566980000091
From the test results in table 1 above, it can be seen that the re-emulsifiable emulsion provided by the embodiment of the present invention has good stability in a high-speed centrifugation state, and does not produce a demulsification phenomenon in the high-speed centrifugation state, so that the re-emulsifiable emulsion is suitable for centrifugal atomization.
Second, electrostatic spraying effect of emulsion
From the emulsions stabilized by high-speed centrifugation, a re-emulsifiable emulsion of example 3 of the present invention, a commercially available soap-free polymerization type emulsion (the emulsion No. 8) and a commercially available PUD dispersion (the emulsion No. 10) were selected and sprayed on an electrostatic test line for 30 minutes, and the film forming effects after spraying are shown in FIGS. 1 to 3. Fig. 1 shows the spray filming effect of acrylic acid soap-free polymerized emulsion, fig. 2 shows the spray filming effect of PUD dispersion emulsion, and fig. 3 shows the spray filming effect of re-emulsifiable emulsion provided by the embodiment of the present invention.
Although the acrylic acid soap-free polymerized emulsion and the PUD dispersoid have good capability of resisting mechanical shearing force, the acrylic acid soap-free polymerized emulsion and the PUD dispersoid belong to thermoplastic resins with relatively large molecules essentially, and are quickly dehydrated to form a film under the action of high-speed centrifugation and forming air and have no reversibility, so that the film is quickly accumulated in a cup and is thrown to the surface of a workpiece under the action of high-speed centrifugation along with the spraying to form flaws. The re-emulsifiable emulsion provided by the embodiment of the invention is dehydrated into a film with reversibility, namely, the re-emulsifiable emulsion can be quickly re-dispersed by water during spraying. The reason is that the re-emulsifiable emulsion provided by the embodiment of the invention has a large number of hydrophilic groups shown as formula (i), hydrophobic groups which ensure the coating performance are connected with the hydrophilic groups, and like the drying film-forming process of the common emulsion, molecular chains in the emulsion particles mutually permeate and diffuse and gradually intertwine with each other, but when the coating film is again in water, the molecular chain main chain of the hydrophobic part rapidly curls up, the hydrophilic groups can wrap the hydrophobic main chain like a surfactant and become emulsion particles to be dispersed in water again, so that the emulsion is not easy to form a pile any more, and the spraying result is shown as fig. 3. The existence of a large amount of hydrophilic groups can seriously affect the resistance of a paint film, so that a proper cross-linking agent can be added, metal ions, carbonitrides, aziridines, epoxysilanes and the like which are cross-linked with carboxyl can be selected at normal temperature, and the cross-linking curing agents can greatly improve the water resistance, solvent resistance, heat resistance and mechanical properties of the paint film, thereby improving the spraying film-forming effect of the re-emulsifiable emulsion. The present invention preferably uses hydrolyzed oligomers of glycidoxypropylmethyldiethoxysilane as the crosslinking agent, which are more stable in water, react faster with the resin, and have lower hydrolysis reactants.
Third, electrostatic spraying test of aqueous wood lacquer
Test samples: the water-based wood paint provided by the embodiment 1-5 of the invention; comparative example 1: commercially available aqueous wood lacquer; comparative example 2 is an aqueous wood lacquer obtained by mixing polyethylene glycol as a cross-linking agent with the substance A in the embodiment 3 according to the weight ratio of 1: 9.75; comparative example 3, an aqueous wood lacquer containing only the substance a of example 3 of the present invention.
The test method comprises the following steps: the test samples are respectively put into the liquid storage cavities of the electrostatic rotary cup equipment, and the spraying test is carried out under the condition of the same electrostatic spraying parameters, and the test results are shown in the following table 2. Wherein, after the spraying film forming, the emulsion accumulation phenomenon does not exist on the surface of the paint film, and the paint film is flat and has good spraying effect; after the spraying film is formed, the emulsion on the surface of the paint film is not uniformly distributed, so that the spraying effect is poor.
TABLE 2
Figure RE-RE-GDA0002078566980000101
In the process of the electrostatic spraying test, when the aqueous wood lacquer provided by the embodiments 1 to 5 of the invention is used for spraying, the phenomenon of spray gun blockage does not occur, and when the aqueous wood lacquer provided by the comparative examples 1 to 3 is used for spraying, the phenomenon of spray gun blockage occurs to different degrees. In addition, as can be seen from the test results in table 2 above, the electrostatic spraying effect of the aqueous wood lacquer provided in the embodiments 1 to 5 of the present invention is significantly better than that of the comparative examples 1 to 3. The experimental result shows that the substance A and the substance B in the waterborne wood lacquer disclosed by the embodiment of the invention have a synergistic effect and can improve the film forming effect of electrostatic spraying.
According to the waterborne wood lacquer provided by the embodiment of the invention, the adopted re-emulsifiable emulsion contains a large number of hydrophilic groups (shown as a formula (I)), the hydrophobic groups which are connected with the hydrophilic groups and ensure the performance of the coating film are mutually permeated and diffused, and are gradually intertwined together in the drying film-forming process, but when the coating film is again in water, the main chain of the molecular chain of the hydrophobic part is rapidly curled up, and the hydrophilic groups can wrap the hydrophobic main chain like a surfactant and become emulsion particles to be dispersed in water again, so that the accumulation is not easy to form; meanwhile, the cross-linking and curing effects of the B substance are matched, so that the water resistance, the solvent resistance, the heat resistance and the mechanical properties of a paint film are greatly improved, the problem of spray gun blockage during spraying by using electrostatic rotary cup equipment is well solved, the spraying effect is good, and the spray gun is suitable for spraying of electrostatic rotary cup equipment based on a centrifugal atomization mode.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The water-based wood lacquer is characterized by comprising a substance A and a substance B;
the A substance comprises the following components: 60-80 w% of re-emulsifiable emulsion, 3.5-15 w% of auxiliary agent, 2-25 w% of color paste and 5-15 w% of deionized water;
the re-emulsifiable emulsion is a resin having the structural formula (I),
Figure RE-FDA0002078566970000011
the B substance is hydrolyzed oligomer of glycidol ether oxypropyl methyl diethoxysilane.
2. The aqueous wood lacquer according to claim 1, wherein the re-emulsifiable emulsion comprises an amine neutralizer.
3. The aqueous wood lacquer according to claim 1, wherein the additives comprise wetting agents, film forming additives, dispersing agents, defoaming agents, surface functional additives, rheological additives and micro wax.
4. The aqueous wood lacquer according to claim 3, wherein the auxiliary agent comprises 0.2-0.5 w% of wetting agent, 2-8 w% of film-forming auxiliary agent, 0.2-0.5 w% of dispersing agent, 0.2-1 w% of defoaming agent, 0.2-2 w% of surface functional auxiliary agent, 0.2-1 w% of rheological auxiliary agent and 0.5-2 w% of micro-powder wax.
5. The aqueous wood lacquer according to claim 1, wherein the substance B is an oligosiloxane.
6. An application method of the water-based wood paint is characterized by comprising the following steps:
mixing the substance A and the substance B according to any one of claims 1 to 5 in a weight ratio of 9-10: 1, and filling the mixture into a liquid storage cavity of an electrostatic spinning cup device;
and adjusting the spraying electrostatic parameters of the electrostatic rotary cup equipment to a corresponding parameter range according to the spraying requirements of the sprayed workpiece, and spraying.
7. The application method of the aqueous wood lacquer according to claim 6, wherein the step of mixing the substance A and the substance B according to a weight ratio of 9-10: 1 and loading the mixture into a liquid storage cavity of an electrostatic spinning cup device specifically comprises the following steps:
and mixing the substance A and the substance B according to the weight ratio of 9.75:1, and filling the mixture into a liquid storage cavity of an electrostatic spinning cup device.
8. The application method of the aqueous wood lacquer according to claim 6, wherein the step of spraying by adjusting the spraying electrostatic parameters of the electrostatic spinning cup device to a corresponding parameter range according to the spraying requirements of the sprayed workpiece specifically comprises:
and adjusting the flow, the forming air, the turbine air and the high-voltage static parameters of the electrostatic rotary cup equipment to corresponding parameter ranges according to the spraying requirements of the sprayed workpiece, and then spraying.
9. The method for applying the aqueous wood lacquer according to claim 8, wherein the step of spraying is performed by adjusting the flow rate, the forming air, the turbine air and the high-voltage electrostatic parameters of the electrostatic spinning cup device to corresponding parameter ranges according to the spraying requirements of the sprayed workpiece, and specifically comprises the following steps:
according to the spraying requirement of a sprayed workpiece, the flow parameter of the electrostatic rotary cup equipment is adjusted to 150-300 cc/min, the forming air parameter is adjusted to 2-3bar, the turbine air parameter is adjusted to 2-3bar, and the high-voltage electrostatic parameter is adjusted to 30-60 KV, so that spraying can be carried out.
10. The application method of the aqueous wood lacquer according to claim 9, wherein according to the spraying requirement of a sprayed workpiece, the spraying step can be performed by adjusting the flow parameter of the electrostatic spinning cup equipment to 150-300 cc/min, the molding air parameter to 2-3bar, the turbine air parameter to 2-3bar and the high-voltage electrostatic parameter to 30-60 KV:
according to the spraying requirement of a sprayed workpiece, the flow parameter of the electrostatic rotary cup equipment is adjusted to 180cc/min, the molding air parameter is adjusted to 2bar, the turbine air parameter is adjusted to 2bar, and the high-voltage electrostatic parameter is adjusted to 50KV, so that spraying can be carried out.
CN201910226873.7A 2019-03-25 2019-03-25 Water-based wood paint and application method thereof Withdrawn CN111732895A (en)

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