CN112920664A - Coating for water-based white shading plastic substrate and preparation method thereof - Google Patents

Coating for water-based white shading plastic substrate and preparation method thereof Download PDF

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CN112920664A
CN112920664A CN202110319084.5A CN202110319084A CN112920664A CN 112920664 A CN112920664 A CN 112920664A CN 202110319084 A CN202110319084 A CN 202110319084A CN 112920664 A CN112920664 A CN 112920664A
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water
resin
white
coating
mass fraction
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吴俊炫
陈廷忠
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Shenzhen Anbos Science And Technology Co ltd
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Shenzhen Anbos Science And Technology 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • 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
    • C09D7/20—Diluents or solvents
    • 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
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0806—Silver
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0812—Aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/005—Additives being defined by their particle size in general

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

The invention discloses a water-based white shading paint for plastic substrates, which comprises the following components in percentage by mass: 2-20% of a film-forming aid; 0.1-0.5% of defoaming agent; 0.1-1.0% of wetting and leveling agent; 0.1-0.5% of a neutralizing agent; 30-40% of white color paste; 0.2-0.8% of a thickening agent; 5-21% deionized water; 36-62% of water-based resin; 0.4-0.8% aqueous aluminum paste; the paint for the water-based white shading plastic base material prepared by the method has the advantages of basically no odor, low VOC and better covering effect.

Description

Coating for water-based white shading plastic substrate and preparation method thereof
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a coating for a water-based white shading plastic substrate and a preparation method thereof.
Background
With the improvement of social environmental awareness, the water-based paint is in a development trend, the black paint has better covering power due to the light absorption property of the black paint, but the white paint has no light absorption effect, and the covering power mainly depends on the refractive index difference between powder and a medium.
At present, methods for improving the covering power of white paint comprise improving the film thickness, screening titanium dioxide with better covering power, or mixing titanium dioxide with different crystal forms, although titanium dioxide has a certain covering effect, the covering power of white paint cannot be obviously improved, in addition, the excessive amount of titanium dioxide can influence the physical properties of a dry film of the paint, and when the paint is sprayed, a yellow phase problem can be generated, and the using effect is influenced; in order to enhance the covering capability of the paint, the most common method at present is to add the aqueous aluminum silver at the same time of adding the titanium dioxide, the aqueous aluminum silver paste usually has certain covering power due to a special structure, the use amount of the aqueous aluminum silver paste is usually recommended to be 5-8% of the paint quality in the industry, if higher covering power is pursued, a larger amount of the aqueous aluminum silver paste is added, but the technical problem of silver dropping is caused when the use amount of the aqueous aluminum silver paste is larger; moreover, waterborne aluminum paste has a metallic feel, and more addition amount can lead to the coating to be grey partially, and both the hiding power of powder need be considered in the aspect of the hiding power improvement of white coating, also need consider the influence of powder to the coating color simultaneously, that is to say no matter adopt waterborne aluminum paste or use the better titanium white powder of hiding power among the prior art can not show the hiding power that improves white coating to use waterborne aluminum paste still can have the problem of silver and the problem of colour change.
Disclosure of Invention
The invention mainly aims to provide a water-based white shading paint for plastic base materials, which aims to solve the defects in the technical background.
In order to achieve the purpose, the invention provides a water-based white shading paint for plastic substrates, which comprises the following components in percentage by mass:
Figure BDA0002992063920000021
the feed additive is characterized by also comprising the following components in percentage by mass:
30-40% of white color paste;
36-62% of water-based resin;
0.4-0.8% of water-based aluminum paste;
the waterborne aluminum paste is sinking silver, and the particle size of the waterborne aluminum paste is 1-10 um.
Preferably, the white pigment of the white color paste is rutile titanium dioxide.
Preferably, the particle size of the white color paste is 1-10 um.
Preferably, the aqueous resin consists of an aqueous acrylic resin, an aqueous polyurethane resin and an aqueous acrylic alkyd modified resin.
Preferably, the mass fraction of the waterborne acrylic resin is 25-37%, the mass fraction of the waterborne polyurethane resin is 7-16%, and the mass fraction of the waterborne acrylic alkyd modified resin is 2-9%.
Preferably, the thickener is an associative polyurethane thickener.
Preferably, the pH of the coating is controlled to be 8-9.
Preferably, the coalescent consists of dipropylene glycol ethyl ether and dipropylene glycol propyl ether.
Preferably, the anti-foaming agent includes, but is not limited to, one or a combination of TEGO 902W, EPERPOL 3225W, KEPERPOL3202W and TEGO825, which is used to eliminate bubbles in the coating.
Preferably, the wetting and leveling agent includes, but is not limited to, one or a combination of two of TEGO 4100 and TEGO 270, and the wetting and leveling agent has both functions of a wetting agent and a leveling agent.
Preferably, the neutralizing agent comprises one or a combination of ammonia, dimethylethanolamine, 2-aminomethyl-1-propanol and AN-130, and is used for adjusting the pH value of the coating and ensuring the stability of the coating for the water-based white shading plastic substrate.
The invention also provides a preparation method of the paint for the water-based white shading plastic base material, which is used for preparing the paint for the water-based white shading plastic base material and comprises the following steps:
adding water-based resin, deionized water and a film-forming aid, and dispersing for 2 minutes at 500-; adding a defoaming agent, a wetting and leveling agent, a neutralizing agent and a thickening agent, and increasing the rotating speed to 1000-; adding white color paste and aqueous aluminum paste, dispersing for 20-30 minutes, stirring uniformly to obtain a finished product, and discharging.
Compared with the prior art, the invention has the beneficial effects that:
(1) aqueous coatings, substantially odorless, low VOC;
(2) the white paint with better covering effect is obtained.
Detailed Description
The present invention is further illustrated by the following specific examples, but it should be noted that the specific material ratios, process conditions, results, etc. described in the examples of the present invention are only for illustrating the present invention and are not to be construed as limiting the scope of the present invention, and all equivalent changes and modifications according to the spirit of the present invention should be covered by the scope of the present invention.
Example 1
The coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000041
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 29.6%, and the mass fraction of the water-based polyurethane resin is 12.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 5%.
Example 2:
the coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000051
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 29.5%, and the mass fraction of the water-based polyurethane resin is 12.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 5%.
Example 3:
the coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000061
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 29.4%, and the mass fraction of the water-based polyurethane resin is 12.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 5%.
Example 4:
the coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000062
Figure BDA0002992063920000071
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film-forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 27.5%, and the mass fraction of the water-based polyurethane resin is 10.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 4%.
Example 5:
the coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000072
Figure BDA0002992063920000081
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film-forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 27.4%, and the mass fraction of the water-based polyurethane resin is 10.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 4%.
Example 6:
the coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000082
Figure BDA0002992063920000091
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film-forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 27.3%, and the mass fraction of the water-based polyurethane resin is 10.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 4%.
Example 7:
the coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000092
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 25.4%, and the mass fraction of the water-based polyurethane resin is 9.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 2%.
Example 8:
the coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000101
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 25.3%, and the mass fraction of the water-based polyurethane resin is 9.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 2%.
Example 9:
the coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure BDA0002992063920000111
the water-based aluminum paste is sinking silver, the particle size of the water-based aluminum paste is 4-8um, the film-forming additive is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent which is PS166, the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic acid alcohol acid modified resin, wherein the mass fraction of the water-based acrylic resin is 25.2%, and the mass fraction of the water-based polyurethane resin is 9.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 2%.
Comparative example 1:
the coating for the water-based white shading plastic base material is characterized by comprising the following components in percentage by mass:
Figure BDA0002992063920000121
the waterborne aluminum paste is sinking silver, the particle size of the waterborne aluminum paste is 4-8um, the film-forming additive consists of dipropylene glycol ethyl ether and dipropylene glycol propyl ether, the mass fraction of the dipropylene glycol ethyl ether is 4%, the mass fraction of the dipropylene glycol propyl ether is 8%, the defoaming agent is TEGO 902W, the wetting leveling agent is TEGO 4100, the neutralizing agent is dimethylethanolamine, the white pigment of the white color paste is rutile titanium dioxide, the particle size of the white color paste is 4-7um, the thickening agent is an associated polyurethane thickening agent, the associated polyurethane thickening agent is PS166, the waterborne resin consists of waterborne acrylic resin, waterborne polyurethane resin and waterborne acrylic acid alcohol acid modified resin, wherein the mass fraction of the waterborne acrylic resin is 28%, and the mass fraction of the waterborne polyurethane resin is 10.2%, the mass fraction of the waterborne acrylic alkyd modified resin is 4%.
The coating is detected by the following method:
and (3) testing the adhesive force: baige method, GB/T9286-;
shading test: the judgment is carried out through visual inspection, the flashlight equipment on the mobile phone is turned on, then the transparent substrate is attached to carry out light source zero-distance irradiation, the light transmission condition is seen, and the PMMA transparent substrate with the thickness of 1.8mm is selected as the substrate.
And (3) testing results:
Figure BDA0002992063920000131
Figure BDA0002992063920000141
in addition, the adhesion force of the above examples is 0 grade by using the one-hundred-grid method, the adhesion force is good, no difference exists after boiling in boiling water for 2 hours, the water boiling resistance is good, the alcohol scouring resistance is good, the dry film of the comparative example 1 is observed to be seriously gray, the water-based aluminum silver paste with the corresponding proportion is not suitable for being applied to a white coating, if the gray scale problem brought by the water-based aluminum silver paste needs to be reduced, more white color paste needs to be added, but the proportion of the water-based resin is reduced due to the increase of the white color paste, the physical properties of the dry film obtained correspondingly are poor, the whiteness of the examples 1 and 8 is observed to meet the requirements of the white coating, and the dry film of the example 9 is slightly gray, but is in an acceptable range.
The experimental results of the above examples and comparative examples were analyzed to find that: (1) examples 1-10 are all added with a small amount of aqueous aluminum paste, and the results show that the thickness of the coating dry film added with the aqueous aluminum paste can achieve a certain shading effect even completely shading effect within 50-80um,
(2) the film thickness of the dry film can be basically and completely shaded when being 60um within a certain range, the film thickness of the dry film can be completely shaded when being 70um, and even the film thickness of the dry film can be completely shaded when being 60 um.
(3) The water-based aluminum silver paste has better covering effect when the mass fraction is 0.5%, 0.6% and 0.7%, and the paint color begins to be slightly grayish when the mass fraction is 0.8%, but the range is acceptable.
Example 10:
the invention also provides a preparation method of the paint for the water-based white shading plastic base material, which is used for preparing the paint for the water-based white shading plastic base material and comprises the following steps:
sequentially adding water-based resin, deionized water and a film-forming auxiliary agent, and dispersing for 2 minutes at 500-; continuing to add the defoaming agent, the wetting and leveling agent, the neutralizing agent and the thickening agent, and increasing the rotating speed to 1000-; sequentially adding white color paste and aqueous aluminum paste, dispersing for 20-30 minutes, uniformly stirring to obtain a finished product, discharging, and filtering with a 150-mesh gauze.
The preparation method of the white color paste in the embodiment 10 comprises the following steps: according to a certain formula proportion, sequentially adding deionized water, a cosolvent, a water-based defoaming agent, a water-based dispersing agent and titanium dioxide, stirring and dispersing at a dispersion machine rotating speed of 1000-1200 rpm for 30min to obtain a white color paste, grinding the obtained white color paste for 3 times by using a three-roll mill until the particle size is 1-10 um.
In the embodiment 10, the raw materials are selected to be sequentially added, so that the waterborne aluminum paste and the color paste can be better dispersed, the film forming quality of the coating can be better ensured, but the adding sequence of different components can be interchanged.
In the above embodiment, the aqueous aluminum paste is an aqueous aluminum paste with a white phase, sinking silver is adopted, and the aqueous aluminum paste has good directional arrangement, sinking type aqueous aluminum paste gradually sinks from the surface of the coating to the substrate, and forms a stable particle distribution form by matching with white color paste, the form is favorable for increasing the refractive index among the aqueous aluminum paste, the white color paste and the medium, and increasing the covering power of the coating, and the sinking silver has small color, the rutile type titanium dioxide is selected in the above embodiment because of the large refractive index, which is favorable for improving the covering power of the coating, in addition, the titanium dioxide in the crystal form has good weather resistance, but when the addition amount is large, the sprayed coating effect has yellow phase property, but the yellow phase problem can be solved by the synergistic effect of the addition of the aqueous aluminum paste and the titanium dioxide, and can produce a white coating film having a light grey-grey phase.
In the above examples, the contents of the thickener, defoamer, film forming aid, and wetting and leveling agent only need to be within the allowable addition ranges of the above substances, and the mass ratio of the aqueous aluminum paste, white paste, and aqueous resin affects the color of the coating, the brittleness of the coating film, and the appearance.
The associative thickener in the above embodiments includes, but is not limited to PS166, and the associative polyurethane thickener has an effect of adjusting the viscosity of the system, has a good splash-proof function, and has a certain adjusting effect on the leveling property and the fluidity of the coating system.
In the embodiment, the dipropylene glycol ethyl ether and the dipropylene glycol propyl ether are used as the film-forming aids, and the two film-forming aids are mainly used for effectively reducing the film-forming temperature of the coating and ensuring that the film-forming property of a paint film is better; the use of defoamers to eliminate bubbles in the coating is not a limitation of the invention to a particular effect or class of defoamers, including but not limited to one or a combination of TEGO 902W, EPERPOL 3225W, KEPERPOL3202W and TEGO 825; the wetting and leveling agent is mainly used for reducing the surface tension of the water-based paint, so that the paint can be better spread on a substrate, and the effect of the wetting agent and the leveling agent is achieved, in the above embodiment, the wetting and leveling agent can be replaced by a wetting agent and a leveling agent, or only the wetting agent or only the leveling agent, because at present, many wetting agents have the property of the leveling agent, and the leveling agent also has the property of the wetting agent, and the wetting and leveling agent includes but is not limited to one or the combination of two of TEGO 4100 and TEGO 270; the neutralizing agent is mainly used for adjusting the pH value of a coating system, increasing the stability of the coating and preventing the damage and instability of the water-based aluminum silver paste; the waterborne resin, such as one or a combination of several of waterborne alkyd resin, waterborne polyester resin, waterborne acrylic resin, waterborne epoxy resin and waterborne amino resin, can also be added into the components of the invention, the waterborne resin in the above embodiments is composed of waterborne acrylic resin, waterborne polyurethane resin and waterborne acrylic alkyd modified resin, and the respective mixture ratio is limited, so that a coating with better performance can be obtained, and the coating has better boiling resistance, alcohol scouring resistance, adhesion and physical properties.
Only some of the above examples are listed, and in other examples, the aqueous aluminum paste has other particle sizes, for example,
1-2um,2-3um,3-4um,4-5um,5-6um,6-7um,8-9um,9-10um, etc., and the particle size of the white slurry may be other particle sizes, for example,
1-2um,2-3um,3-4um,4-5um,5-6um,6-7um,8-9um,9-10um, etc., and in other embodiments, the white paste includes other white pigments such as lithopone, titanous, anatase titanium dioxide, etc.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.

Claims (9)

1. The coating for the water-based white shading plastic base material comprises the following components in percentage by mass:
Figure FDA0002992063910000011
the feed additive is characterized by also comprising the following components in percentage by mass:
30-40% of white color paste;
36-62% of water-based resin;
0.4-0.8% of water-based aluminum paste;
the waterborne aluminum paste is sinking silver, and the particle size of the waterborne aluminum paste is 1-10 um.
2. The paint for the water-based white shading plastic substrate as claimed in claim 1, wherein the white pigment of the white color paste is rutile type titanium dioxide.
3. The paint for the water-based white shading plastic base material as claimed in claim 1, wherein the particle size of the white color paste is 1-10 um.
4. The paint for the water-based white shading plastic substrate as claimed in claim 1, wherein the water-based resin is composed of water-based acrylic resin, water-based polyurethane resin and water-based acrylic alkyd modified resin.
5. The paint for the water-based white shading plastic substrate as claimed in claim 4, wherein the mass fraction of the water-based acrylic resin is 25-37%, the mass fraction of the water-based polyurethane resin is 7-16%, and the mass fraction of the water-based acrylic alkyd modified resin is 2-9%.
6. The coating for an aqueous white light-screening plastic substrate according to claim 1, wherein the thickener is an associative polyurethane thickener.
7. The coating for the water-based white light-screening plastic substrate as claimed in claim 1, wherein the pH of the coating is controlled to 8 to 9.
8. The coating for an aqueous white light-screening plastic substrate as claimed in claim 1, wherein said film-forming assistant is composed of dipropylene glycol ethyl ether and dipropylene glycol propyl ether.
9. A method for producing a water-based white light-screening plastic substrate coating material for producing the water-based white light-screening plastic substrate coating material according to any one of claims 1 to 8, characterized by comprising the steps of:
adding water-based resin, deionized water and a film-forming aid, and dispersing for 2 minutes at 500-; adding a defoaming agent, a wetting and leveling agent, a neutralizing agent and a thickening agent, and increasing the rotating speed to 1000-; adding white color paste and aqueous aluminum paste, dispersing for 20-30 minutes, stirring uniformly to obtain a finished product, and discharging.
CN202110319084.5A 2021-03-25 2021-03-25 Coating for water-based white shading plastic substrate and preparation method thereof Withdrawn CN112920664A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115044262A (en) * 2022-08-01 2022-09-13 深圳市安伯斯科技有限公司 Coating for water-based white shading plastic substrate and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115044262A (en) * 2022-08-01 2022-09-13 深圳市安伯斯科技有限公司 Coating for water-based white shading plastic substrate and preparation method thereof

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