Waterborne one-component tint base paint with good color stability and preparation method thereof

Abstract

The application discloses a water-based single-component color matching base paint with good color stability, which comprises the following components: a water-based emulsion, a wet dispersing agent, a defoaming agent, a wax aid, a matting powder, a film forming aid, a pH regulator, an anti-sagging aid pre-gel, a thickening agent, a wetting agent, a leveling agent, pure water and a bactericide. The prepared water-based single-component color matching base paint product has the performance characteristics of high compatibility and good color stability, and has the characteristics of good adhesion, fast drying speed, good anti-blocking property and the like; the construction mode can be manual spraying, manual brushing and equipment spraying, and the water-based single-component color matching base paint can be used for factory painting and DIY painting. The application further relates to a preparation method of the water-based single-component color matching base paint with good color stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water-based wood paint, in particular to a water-based single-component color matching base paint with good color stability and a preparation method thereof. BACKGROUND

[0002] With the development of society, people's requirements for environmental protection are getting higher and higher in recent years. Although water-based wood products have excellent environmental performance, they still have the following problems:

[0003] 1. The water-based color paint has floating color in the tank, and needs to be stirred additionally during use.

[0004] 2. The water-based color matching base paint has poor compatibility with the water-based color paste on the market, which is specifically manifested as follows: the color of the mixed color paint cannot be quickly stabilized, and the color phase of the color paint changes after being stored for a period of time, which is called poor color stability of the color paint.

[0005] The color matching base paint mainly adopts the following technical routes:

[0006] 1. Acrylic emulsion system, carboxylate wetting dispersant system matched with anionic or non-ionic wetting dispersant, different powders (heavy calcium, talc, kaolin, diatomite, etc.) are matched, and cellulose plus polyurethane or modified thickening agent is used in the rheological system to realize good color development and thixotropy of the system.

[0007] 2. Acrylic emulsion system, high molecular weight polyurethane or modified wetting dispersant system, the rheological system can meet the on-site construction, and a full-automatic color matching machine is used for present mixing and present use.

[0008] 3. Acrylic emulsion system, no wetting dispersant, the rheological system uses high molecular weight polyurethane or modified thickening agent, bentonite or polyamide wax thickening agent to match, so that the system has strong thixotropy, and the color paint after color matching has less floating color in the tank.

[0009] However, the above-mentioned several technical routes also have some disadvantages:

[0010] The first technical route contains fillers, and the function belongs to a mixed paint. Although the color development is good, the brightness of the color paint is obviously decreased due to the addition of fillers. At the same time, the water-based emulsion uses emulsion with good color filler wrapping property and particle size of more than 100 nm, which has slow dryness, poor initial adhesion, and poor permeability. The film is formed only on the surface of the substrate with good surface density (such as wood, PVC, polystyrene board, and paint-free board), and although the fillers are added, the adhesion is still poor, and the film is not fine.

[0011] The second technical route is suitable for factories with mature toning systems, and can avoid the in-can floating color of the color paint, but the toning needs to use a full-automatic toning machine, which cannot meet most application scenarios, and the product has great limitations in use, is inconvenient to use, and has high use cost.

[0012] The third technical route solves the in-can floating color problem through a rheological system, and the rheological system establishes a strong "steric hindrance effect" with the emulsion system and the pigment particles to reduce the separation of the pigment particles, and the in-can floating color is small. The color development is better than the second technical route. The toning base paint does not add a wet dispersant, and the addition of different color pastes relies on the balance of the self-provided wet dispersing system and the toning base paint. On the one hand, the toning base paint will adsorb the wet dispersant provided by the color paste, which will cause the color wetness of the color paint to decrease, and will cause the color brightness of the color paint to decrease to a certain extent and the color stability of the color paint to be poor. On the other hand, the HLB value of the water-based color paste is high or low, and the compatibility of different color pastes added to the toning base paint is poor. The toning base paint cannot solve the compatibility problem of most color pastes through effective "charge stabilization", which will cause the color paint to re-develop color or cause the flocculation of part of the pigment particles during storage, which will cause the color of the color paint to change, and cause the color stability of the color paint to be poor before and after storage. SUMMARY

[0013] The technical problem to be solved by the present application is to provide a water-based single-component toning base paint with good color stability and a preparation method thereof, which is a more excellent solution for a water-based single-component toning base paint with good color stability, and solves the following problems:

[0014] 1. Good adhesion to various substrates: ≤1 level;

[0015] 2. The paint film is fine, the drying speed is fast, the anti-blocking property is good, and the offline stacking is possible;

[0016] 3. Good color development, good compatibility with various color pastes on the market, good color stability of the adjusted color paint before and after storage, and color difference ≤0.5 before and after storage (30 days of storage at room temperature) after spraying.

[0017] To solve the above problems, the present application realizes the following technical solutions:

[0018] The first application purpose of the present application is:

[0019] A water-based single-component toning base paint with good color stability is provided, which comprises the following weight percentage composition:

[0020] Waterborne emulsion 60-90%, wetting dispersant 0.5-4%, antifoaming agent 0.2-1.0%, wax aid 0.5-4.0%, flatting powder 0.2-3.0%, film forming aid 2-8.0%, pH adjuster 0.05-0.5%, anti-sagging aid pre-gel 0.5-5%, thickening agent 0.2-3.0%, wetting agent 0.1-2.0%, leveling agent 0.1-2.0%, pure water 3-20%, bactericide 0.01-0.3%, the sum of all components is 100%.

[0021] A preferred example of the waterborne single-component tint base paint with good color stability of the present application is:

[0022] The waterborne emulsion is one or a mixture of several of waterborne acrylic emulsion, waterborne polyurethane modified acrylic emulsion, waterborne polyurethane emulsion.

[0023] A preferred example of the waterborne single-component tint base paint with good color stability of the present application is:

[0024] The wetting dispersant is a de-flocculation high molecular polyurethane modified dispersant combined with a high molecular weight carboxylate dispersant or a modified carboxylate dispersant.

[0025] A preferred example of the waterborne single-component tint base paint with good color stability of the present application is:

[0026] The combination of the waterborne emulsion and the wetting dispersant is:

[0027] The combination of the waterborne emulsion and the wetting dispersant is:

[0028] or

[0029] The combination of the waterborne emulsion and the wetting dispersant is:

[0030] These combinations allow the waterborne single-component tint base paint of the present application to have excellent color development and color stability; at the same time, the waterborne emulsion combination provides excellent adhesion and anti-blocking properties, increasing the construction tolerance and production efficiency.

[0031] A preferred example of the waterborne single-component tint base paint with good color stability of the present application is:

[0032] The thickening agent is a mixture of one or two of high-shear polyurethane thickening agent, high-shear polyether modified thickening agent, medium-low shear polyurethane thickening agent and medium-low shear polyether modified thickening agent, and has good workability.

[0033] A preferred example of the water-based single-component color matching base paint with good color stability of the present application is:

[0034] The anti-sagging auxiliary pre-gel is prepared by high-speed dispersion of the anti-sagging auxiliary and pure water, and the anti-sagging auxiliary pre-gel should be prepared and used immediately.

[0035] The anti-sagging auxiliary is a mixture of one or more of bentonite, montmorillonite, polyamide wax slurry and polyurea slurry.

[0036] The rheological system of the present application preferably uses a mixture of one or two of high-shear polyurethane thickening agent, medium-low shear polyurethane thickening agent and medium-low shear polyurethane thickening agent, and a mixture of one or more of anti-sagging auxiliary pre-gel prepared from montmorillonite, bentonite, polyamide wax slurry and polyurea slurry, so that the water-based single-component color matching base paint can be easily and quickly stirred uniformly after adding the water-based color paste, the color phase is stable, and the color floating in the tank is small.

[0037] A preferred example of the water-based single-component color matching base paint with good color stability of the present application is:

[0038] The film-forming aid is an alcohol ether film-forming aid, preferably a combination of propylene glycol, dipropylene glycol methyl ether, dipropylene glycol butyl ether and tripropylene glycol butyl ether, and the total content meets the national standard limit requirements.

[0039] A preferred example of the water-based single-component color matching base paint with good color stability of the present application is:

[0040] The pH regulator is one of organic amines, and the preferred pH regulator is AMP-95, which is mainly used to adjust the pH value of the system and improve the storage stability.

[0041] A preferred example of the water-based single-component color matching base paint with good color stability of the present application is:

[0042] It includes one or more of the following characteristic combinations:

[0043] The defoaming agent is a mixture of one or more of mineral oil and modified defoaming agent, molecular defoaming agent or silicone defoaming agent, and the preferred defoaming agent is silicone defoaming agent.

[0044] The wetting agent is a mixture of one or more of silicone wetting agent, acetylene diol wetting agent, super wetting agent, and fluorine modified wetting agent, and the preferred wetting agent is TegoWet 270 or TEGO twin 4100 in combination with DuPont Capstone FS-61;

[0045] The wax aid is a mixture of one or both of wax powder and wax emulsion;

[0046] The leveling agent is a mixture of one or both of silicone leveling agent and acrylic leveling agent;

[0047] The bactericide is a BIT type bactericide, which meets various environmental protection standards;

[0048] The pure water is self-produced pure water, or purchased pure water, and the batch stability of the formula is good due to the use of pure water.

[0049] The second inventive purpose of the present application is:

[0050] A preparation method of the water-based single-component color matching base paint with good color stability is provided, and the preparation method comprises the following preparation steps:

[0051] A. A clean large jar a is taken, a suitable dispersion disc is selected, the diameter ratio of the dispersion disc to the container is 0.4-0.6, the water-based emulsion is filtered through an 80-micron filter screen, and then slowly added to the center of the dispersion disc, the stirring speed is 800 rpm, the wetting dispersant, the defoaming agent, the wax aid and the flatting powder are added in a thin stream to the center of the dispersion disc, the feeding speed is appropriate so that the powder does not accumulate on the liquid surface, and the excess powder is washed with part of the pure water;

[0052] B. Another clean container b is taken, and the following materials are added in a thin stream: part of the pure water, the film-forming aid and the pH regulator are sequentially added, suitable dispersion equipment is selected according to the size of the container, the dispersion speed is kept at 600 rpm, and the dispersion is carried out for 10 minutes until uniform, then the mixture is slowly added to the center of the dispersion disc in a thin stream, the stirring speed is increased to 1800 rpm, and then the thickening agent is continuously added; the dispersion is carried out for 20 minutes until the fineness is ≤20 μm, and the scraper is oil-free square, and then the next step is carried out;

[0053] C. The anti-sagging aid pre-gel is slowly added to the large jar a, the stirring is carried out for 5 minutes, then the stirring speed is reduced to 1200 rpm, and then the wetting agent, the leveling agent, the bactericide and the remaining part of the pure water are added; the stirring is continuously carried out for 10 minutes until uniform, the film appearance is detected by sampling, and the next step is carried out after the film appearance is qualified;

[0054] D. The stirring speed is reduced to 400 rpm, and the stirring is carried out for 10 minutes; and the filtration and packaging are carried out after the detection is qualified.

[0055] The preparation method of the water-based single-component color matching base paint with good color stability of the present application, wherein the preparation method of the anti-sagging auxiliary pre-gel solution is:

[0056] Take a clean container c, add the appropriate amount of pure water, start stirring, speed 800 rpm, align the dispersion disc center, slowly add the anti-sagging auxiliary, increase the stirring speed to 1200 rpm, stir for 30 minutes, and the anti-sagging auxiliary pre-gel solution is obtained. Various anti-sagging auxiliary pre-gel solutions should be prepared separately according to this method;

[0057] The anti-sagging auxiliary is one or a mixture of several of bentonite, montmorillonite, polyamide wax slurry, and polyurea slurry.

[0058] The preparation method used in the present application is a unique preparation method of split emulsion formula, which takes into account the dispersibility and compatibility of various materials and solves various problems that may occur during product preparation.

[0059] The water-based single-component color matching base paint with good color stability of the present application and its preparation method have the following advantages and excellent effects compared to existing technologies:

[0060] The present application mainly adopts the third technical path involved in the background technology, increases the dispersant system to control: the dispersant system preferably uses a deflocculating high molecular polyurethane modified dispersant combined with a high molecular weight carboxylate dispersant or a modified carboxylate dispersant; the rheological system preferably uses a combination of polyurethane or modified thickening agent and anti-sagging auxiliary pre-gel solution.

[0061] A preferred feature combination of the present application is:

[0062] The water-based emulsion uses Desman NeoCryl XK-14 water-based acrylic emulsion combined with Alberdingk UC8400 water-based polyurethane modified acrylic emulsion;

[0063] The wet dispersing system uses Basf Dispex Ultra PA 4550 wet dispersing agent combined with Mingling Metolat388 wet dispersing agent;

[0064] The rheological system uses Dow Acrysol RM-2100 high shear polyurethane thickening agent, combined with one or a mixture of two of Haimins Rheolate 299 medium-low shear polyurethane thickening agent and Wanhua U505 medium-low shear polyurethane thickening agent, combined with anti-sagging auxiliary pre-gel solution prepared from Byk Laponite RDS montmorillonite and Clayminton LB bentonite.

[0065] Another preferred feature combination of the present application is:

[0066] The aqueous emulsion is prepared by using Dow Roshield 560 aqueous acrylic emulsion in combination with Evonik NeoRez R2180 aqueous polyurethane modified acrylic emulsion;

[0067] The dispersant system is prepared by using BASF Dispex Ultra PA 4550 wetting dispersant in combination with Afcona 5071 wetting dispersant;

[0068] The rheological system is prepared by using Dow Acrysol RM-2100 high shear polyurethane thickening agent in combination with Himin Rheolate 299 medium and low shear polyurethane thickening agent, and an anti-sagging auxiliary pre-gel liquid prepared from a dispersion of Evonik AQ633E polyamide wax.

[0069] The two feature combinations can solve the problem of adding an aqueous color paste, and the aqueous color paste with different HLB values can quickly develop color and reach stability after being added to the color matching base paint.

[0070] The third technical route is improved by using the technical route, but the advantages brought by the rheological system are still maintained:

[0071] The wetting dispersant system is prepared by using a deflocculating high molecular polyurethane modified dispersant in combination with a high molecular weight carboxylate dispersant or a modified carboxylate dispersant. The wetting dispersant system, the aqueous emulsion system and the rheological system are combined carefully through a large number of tests, and an effective "steric hindrance effect" and "charge stabilization effect" are established through the rheological system, the wetting dispersant system, the aqueous emulsion system and the pigment particles, so as to effectively avoid the separation of the pigment particles and solve the problems of color separation in the tank and poor color stability.

[0072] In summary, the present application provides a water-based single-component color matching base paint with good color stability and a preparation method. The specific beneficial effects of the present application are as follows:

[0073] The present application is prepared by mixing the aqueous emulsion, the wetting dispersant, the film forming aid, the rheological aid and the wetting agent. The color paint prepared by adding the color paste has good color stability after storage, and does not need to be adjusted before use or used by a full self-color matching machine.

[0074] Further, the paint film of the present application has good adhesion, and has good adhesion on PVC, UV, PU, coating mud, water-based and other substrates. At the same time, the water-based emulsion has a small particle size (particle size of 40-80 nm), a fast drying speed, a good paint film fineness, and can be stacked after the furniture and other products are offline, thereby solving the problems of poor anti-blocking and poor adhesion of various substrates. The water-based single-component color matching base paint obtained by the present application does not need to be coated with a transition primer.

[0075] The construction mode can adopt manual spraying, manual brushing and equipment spraying, and can be used for factory coating and DIY coating. Continuous production can be realized during construction, and packaging can be realized after offline, thereby improving construction efficiency and obtaining the same construction effect. The production cost of the application is low, the application is convenient to use, and the construction cost is greatly reduced. DETAILED DESCRIPTION

[0076] In order to make the application, technical solutions and advantages of the present application clearer and more apparent, the present application is described in detail in combination with specific examples. It should be understood that the examples are only used to illustrate the present application, and are not used to limit the protection scope of the present application. Simple improvements of the preparation method of the present application under the concept of the present application are within the protection scope of the present application.

[0077] Since most of the performances of the product of the present application are better than those of most of the products on the market and higher than the performance requirements in the national standard GB / T 23999-2009, but the national standard does not make provisions for these performances, the performances are described in the performance table.

[0078] Example 1

[0079] A preparation method of a water-based single-component tinting base paint, comprising the following steps:

[0080] 1) Take a clean large jar a, select a suitable dispersion disc, the diameter ratio of the dispersion disc to the diameter of the container is 0.4-0.6, filter 61 g of water-based emulsion (Disperse NeoCryl XK-14) and 14 g of water-based emulsion (Alberdingk UC 8400) using an 80-micron filter screen, then slowly add to the center of the dispersion disc, start stirring at a speed of 800 rpm, and add 0.8 g of wet dispersant (BASF Dispex Ultra PA 4550), 0.3 g of wet dispersant (Mingling Metolat 388), 0.3 g of defoaming agent (BYK-024), 0.1 g of defoaming agent (Tego Foamex 845) and 0.1 g of defoaming agent (Mingling Agitan 765) in a thin stream state, slowly add 1 g of wax additive (ULtralube D-816), 1.5 g of wax additive (Michem Emulsion 93235) and 0.4 g of flatting powder (Hongsheng TSA-250L) to the center of the dispersion disc, the feeding speed is appropriate when the powder does not accumulate on the liquid surface, and the excess powder is washed with 0.5 g of pure water;

[0081] 2) Take another clean container b, add the following materials in a thin stream, add 4g pure water, add 2g film forming aid (commercial DPM), 2g film forming aid (commercial DPnB), 1g film forming aid (commercial TPnB) and 0.1g pH regulator (commercial AMP-95) in turn, select appropriate dispersion equipment according to the size of the container, disperse for 10 minutes to uniformity at a speed of 600 rpm, align the center of the dispersion disc, slowly add into large jar a in a thin stream; increase the speed to 1800 rpm, continue to add 0.5g thickening agent (Dow Acrysol RM-2100), 0.2g thickening agent (Hermes Rheolate 299), 0.2g thickening agent (Wanhua U505); disperse for 20 minutes to a fineness of ≤20μm, and the scraper is oil-free square, which can proceed to the next step;

[0082] 3) Take another clean container c, add 0.9g pure water, start stirring at a speed of 800 rpm, slowly add 0.1g anti-sagging aid (Bik Laponite RDS) into the center of the dispersion disc, increase the stirring speed to 1200 rpm, stir for 30 minutes to obtain an anti-sagging aid pre-gel solution (10% Bik Laponite RDS); take another clean container d, add 0.45g pure water, start stirring at a speed of 800 rpm, slowly add 0.05g anti-sagging aid (Clayminton LB) into the center of the dispersion disc, increase the stirring speed to 1200 rpm, stir for 30 minutes to obtain an anti-sagging aid pre-gel solution (10% Clayminton LB). Slowly add the prepared anti-sagging aid pre-gel solution into large jar a in turn, stir for 5 minutes, then reduce the speed to 1200 rpm, add 0.3g wetting agent (Tego twin 4100), 0.05g wetting agent (Dupont Capstone FS-61), 0.2g leveling agent (Tego GLIDE 450), 0.1g bactericide (ACTICIDE B20) and the remaining 7.85g pure water; continue to stir for 10 minutes to uniformity, sample and detect the appearance of the paint film, and the next step can be performed only after the sample is qualified;

[0083] 4) Reduce the speed to 400 rpm and stir for 10 minutes; after inspection, filter and package.

[0084] Example 2

[0085] A preparation method of a water-based single-component tinting base paint, comprising the following steps:

[0086] 1) Take a clean large jar a, choose the appropriate dispersion disc, the ratio of the diameter of the dispersion disc to the diameter of the container is between 0.4-0.6, filter 65g aqueous emulsion (Disperse NeoCryl XK-14) and 10g aqueous emulsion (Alberdingk UC 8400) using an 80-micron filter, then slowly add to the center of the dispersion disc, start stirring at 800 rpm, add 1.2g wetting dispersant (BASF Dispex Ultra PA 4550), 0.3g wetting dispersant (Mingling Metolat 388), 0.5g defoamer (BYK-024) and 0.1g defoamer (Mingling Agitan 765) in turn in a thin stream, slowly add 2g wax additive (Michem Emulsion 93235) and 0.5g flatting powder (Hongsheng TSA-250L), the feeding speed should be appropriate so that the powder does not accumulate on the liquid surface, and the excess powder is washed with 0.5g pure water;

[0087] 2) Take another clean container b, add 4g pure water, add 1g film-forming aid (commercially available DPM), 3g film-forming aid (commercially available DPnB), 0.5g film-forming aid (commercially available TPnB) and 0.1g pH adjuster (commercially available AMP-95) in turn in a thin stream, choose the appropriate dispersion equipment according to the size of the container, keep the stirring speed at 600 rpm for 10 minutes until uniform, then slowly add to the center of the dispersion disc in a thin stream; increase the stirring speed to 1800 rpm, continue to add 0.3g thickening agent (Dow Acrysol RM-2100) and 0.6g thickening agent (Wanhua U505); disperse for 20 minutes until the fineness is ≤20μm, and the spatula is oil-free, then proceed to the next step;

[0088] 3) Take another clean container c, add 1.35g pure water, start stirring at 800 rpm, slowly add 0.15g anti-sagging aid (Clayminton LB) to the center of the dispersion disc, increase the stirring speed to 1200 rpm, and stir for 30 minutes to obtain an anti-sagging aid pre-gel; slowly add the prepared anti-sagging aid pre-gel to jar a, stir for 5 minutes, then reduce the stirring speed to 1200 rpm, and add 0.5g wetting agent (Tego twin 4100 leveling agent), 0.05g wetting agent (DuPont Capstone FS-61), 0.1g leveling agent (Tego GLIDE 450), 0.1g bactericide (ACTICIDE B20) and the remaining 8.15g pure water; continue stirring for 10 minutes until uniform, take a sample to detect the appearance of the paint film, and proceed to the next step after passing the test;

[0089] 4) Reduce the stirring speed to 400 rpm and stir for 10 minutes; filter and package after passing the test.

[0090] Example 3

[0091] A method for preparing an aqueous single-component tinted base paint, comprising the following steps:

[0092] 1) Take a clean large jar a, select the appropriate dispersing disc, the ratio of the diameter of the dispersing disc to the diameter of the container is between 0.4-0.6, filter 60g of aqueous emulsion (Dow Roshield 560) and 20g of aqueous emulsion (Evonik NeoRez R2180) using an 80-micron filter, then slowly add to the center of the dispersing disc, start stirring at 800 rpm, and add 1g of wet dispersant (BASF Dispex Ultra PA 4550), 0.3g of wet dispersant (Afcona 5071), 0.3g of defoaming agent (BYK-024), and 0.2g of defoaming agent (Tego Foamex 845) in a thin stream to the center of the dispersing disc, slowly add 1g of wax additive (ULtralube D-816) and 0.4g of flatting powder (Hongsheng TSA-250L), the feeding speed should be appropriate so that the powder does not accumulate on the liquid surface, and the excess powder on the side is washed with 0.5g of pure water;

[0093] 2) Take another clean container b, add the following materials in a thin stream, add 4g of pure water, and then add 2g of film-forming additive (commercially available DPM), 1g of film-forming additive (commercially available DPnB), 2g of film-forming additive (commercially available TPnB), and 0.1g of pH adjuster (commercially available AMP-95), select the appropriate dispersing equipment according to the size of the container, and maintain the stirring speed at 600 rpm for 10 minutes until the mixture is evenly dispersed, then slowly add to the center of the dispersing disc in a thin stream;

[0094] Increase the stirring speed to 1800 rpm, and continue to add 0.4g of thickening agent (Dow Acrysol RM-2100) and 0.2g of thickening agent (Hempel Rheolate 299); disperse for 20 minutes until the fineness is ≤20μm, and the scraper is oil-free and square-shaped before proceeding to the next step;

[0095] 3) Take another clean container c, add 1.6 g of pure water, start stirring, speed 800 rpm, slowly add 0.4 g of anti-sagging agent (Desbon AQ633E) to the center of the dispersion disc, increase the stirring speed to 1200 rpm, stir for 30 minutes, then slowly add the prepared anti-sagging agent pre-gel to the large jar a, stir for 5 minutes, then reduce the speed to 1200 rpm, and then add 0.5 g of wetting agent (Tego Wet 270), 0.05 g of wetting agent (Dupont Capstone FS-61), 0.1 g of leveling agent (Tego GLIDE 450), 0.1 g of fungicide (ACTICIDE B20) and the remaining 3.85 g of pure water; continue stirring for 10 minutes until uniform, sample the paint film appearance, and if it is qualified, proceed to the next step;

[0096] 4) Reduce the speed to 400 rpm and stir for 10 minutes; after inspection, filter and package.

[0097] Comparative Example 1

[0098] A method for preparing a water-based single-component tinting base paint, comprising the following steps:

[0099] 1) Take a clean large jar a, select a suitable dispersion disc, the ratio of the diameter of the dispersion disc to the diameter of the container is 0.4-0.6, filter 60 g of water-based emulsion (Dow Roshield 3311) and 15 g of water-based emulsion (Dow NeoRez R2180) using an 80-micron filter, then slowly add them to the center of the dispersion disc, start stirring, speed 800 rpm, and then slowly add 0.5 g of wetting dispersant (Tego DISPERS 755w), 0.3 g of defoaming agent (BYK-024) and 0.2 g of defoaming agent (Tego Foamex 845) to the center of the dispersion disc in a thin stream, slowly add 2 g of wax additive (Michem Emulsion 93235) and 0.5 g of flatting powder (Hongseng TSA-250L), the feeding speed should be appropriate so that the powder does not accumulate on the liquid surface, and the excess powder is washed with 0.5 g of pure water;

[0100] 2) Take another clean container b, add 4 g of pure water, and then add 2 g of film-forming aid (commercially available DPM), 3 g of film-forming aid (commercially available DPnB) and 0.1 g of pH adjuster (commercially available AMP-95) in a thin stream, select a suitable dispersion device according to the size of the container, keep the speed at 600 rpm and disperse for 10 minutes until uniform, then slowly add them to the center of the dispersion disc in a thin stream; increase the speed to 1800 rpm, and then continue to add 0.5 g of thickening agent (Dow RM-2020) and 0.6 g of thickening agent (Dow RM-8w); disperse for 20 minutes until the fineness is ≤20 μm, and the spatula is oil-free square, then proceed to the next step.

[0101] 3) Take another clean container c, add 1.8g pure water, start stirring, speed 800 rpm, slowly add 0.2g anti-sagging agent (Bik Laponite RDS) to the center of the dispersion disc, increase the stirring speed to 1200 rpm, stir for 30 minutes, and obtain the anti-sagging agent pre-gel solution; slowly add the prepared anti-sagging agent pre-gel solution to the large jar a, stir for 5 minutes, then reduce the speed to 1200 rpm, and then add 0.3g wetting agent (Tego twin 4100), 0.2g leveling agent (Tego GLIDE 450), 0.1 bactericide (ACTICIDE B20) and the remaining 8.2g pure water; continue stirring for 10 minutes until uniform, sample and test the film appearance, and then proceed to the next step after passing the test;

[0102] 4) Reduce the speed to 400 rpm and stir for 10 minutes; filter and package after passing the test.

[0103] Comparative Example 2

[0104] A method for preparing a water-based single-component tinting base paint, comprising the following steps:

[0105] 1) Take a clean large jar a, select a suitable dispersion disc, the ratio of the diameter of the dispersion disc to the diameter of the container is 0.4-0.6, filter 50g water-based emulsion (Wanhua Lacper 4055) using an 80 micron filter, then slowly add to the center of the dispersion disc, start stirring, speed 800 rpm, and then add 1.0g wetting dispersant (Tego DISPERS 755w), 0.3g defoamer (BYK-024) and 0.3g defoamer (Tego Foamex 845) in a thin stream to the center of the dispersion disc, slowly add 2g wax additive (Michem Emulsion 93235), 20g heavy calcium (Guangfu Building Materials CC-1000), 5g high-lead earth (Monsi 4000 mesh) and 0.5g matting powder (Hongsheng TSA-250L), the feeding speed should be appropriate so that the powder does not accumulate on the liquid surface, and the excess powder is washed with 0.5g pure water;

[0106] 2) Take another clean container b, add the following materials in a thin stream, add 8 g of pure water, add 1 g of film forming aid (commercial propylene glycol), 2 g of film forming aid (commercial alcohol ester twelve), 2 g of film forming aid (commercial DPnB) and 0.1 g of pH regulator (commercial AMP-95) in turn, select appropriate dispersion equipment according to the size of the container, disperse for 10 minutes to uniformity at a speed of 600 rpm, align the center of the dispersion disc, slowly add to large jar a in a thin stream; increase the speed to 1800 rpm, continue to add 0.3 g of thickening agent (Dow RM-2020) and 0.5 g of thickening agent (Dow RM-8W); disperse for 20 minutes to a fineness of ≤60 μm, and the scraper is oil-free square, which can proceed to the next step of operation;

[0107] 3) Take another clean container c, add 1.35 g of pure water, start stirring at a speed of 800 rpm, slowly add 0.15 g of anti-sagging aid (Bik Laponite RDS) to the center of the dispersion disc, increase the stirring speed to 1200 rpm, and stir for 30 minutes to obtain an anti-sagging aid pre-gel solution; slowly add the prepared anti-sagging aid pre-gel solution to large jar a, stir for 5 minutes, then reduce the speed to 1200 rpm, and add 0.3 g of wetting agent (Tego twin 270), 0.2 g of leveling agent (Tego GLIDE 450), 0.1 g of bactericide (ACTICIDE B20) and the remaining 4.4 g of pure water; continue to stir for 10 minutes to uniformity, sample and test the appearance of the paint film, and the next step of operation can be performed only after the sample is qualified;

[0108] 4) Reduce the speed to 400 rpm and stir for 10 minutes; after inspection, filter and package.

[0109] The proportions of the components in each raw material in Examples 1-3 and Comparative Examples 1-2 are shown in Table 1. The content of each raw material component in the table is parts by weight.

[0110] The proportions of the components in each raw material in Examples 1-3 and Comparative Examples 1-2 are shown in Table 1. The content of each raw material component in the table is parts by weight.

[0111]

[0112]

[0113] Performance test:

[0114] (1) The water-based single-component tinting base paint obtained in Examples 1-3 and Comparative Examples 1-2 was tested according to the national standard GB / T 23999-2009 and related methods, and the technical performance results are shown in Table 2.

[0115] As can be seen from Table 2, the water-based single-component tinting base paint obtained in Examples 1-3 is superior to the water-based single-component tinting base paint obtained in Comparative Example 1 in terms of adhesion, and the water-based single-component tinting base paint obtained in Examples 1-3 is superior to the water-based single-component tinting base paint obtained in Comparative Example 2 in terms of adhesion, anti-blocking and down-line stackability.

[0116] Table 2 Test results of properties of the water-based single-component tinting base paints obtained in Examples 1-3 and Comparative Examples 1-2

[0117]

[0118] (2) The water-based single-component tinting base paints prepared in Examples 1-3 and Comparative Examples 1-2 were respectively tinted into coffee color tinting paints and gray-blue color tinting paints according to the following formulations. The tinting paints were tested according to the color stability evaluation method, and the test results are shown in Table 3.

[0119] The coffee color tinting paint formulation is as follows: 100 g of the water-based single-component tinting base paint was sequentially added with 0.244 g of a commercially available water-based iron yellow paste, 0.036 g of a commercially available water-based iron red paste, 2 g of a commercially available water-based black paste and 2.56 g of a commercially available water-based white paste for tinting, and then stirred at 1500 rpm for 15 minutes until uniform, to obtain the coffee color tinting paint.

[0120] The gray-blue color tinting paint formulation is as follows: 100 g of the water-based single-component tinting base paint was sequentially added with 0.8 g of a commercially available water-based blue paste, 1.03 g of a commercially available water-based black paste, 0.32 g of a commercially available water-based magenta paste and 4.4 g of a commercially available water-based white paste for tinting, and then stirred at 1500 rpm for 15 minutes until uniform, to obtain the gray-blue color tinting paint.

[0121] The color stability evaluation method is as follows: two white PVC base plates were prepared, one of which was uniformly coated with a layer of coffee color tinting paint, and then dried at room temperature for 24 hours. The remaining coffee color tinting paint was stored at room temperature for 30 days, and then repeated according to the same process to uniformly coat another white base plate with a layer of paint film, and then dried at room temperature for 24 hours. The color difference between the two paint films was compared using a color difference meter. (The same operation was performed for gray-blue color)

[0122] As can be seen from Table 3, the water-based single-component tinting base paints obtained in Comparative Examples 1-2 changed greatly in coffee and gray-blue colors after 30 days when the commercially available water-based color pastes were used for tinting; the water-based single-component tinting base paints obtained in Examples 1-3 changed little or not at all in coffee and gray-blue colors after 30 days when the water-based color pastes were used for tinting, indicating that the water-based single-component tinting base paints obtained in the present application have good color stability before and after storage when the commercially available water-based color pastes are added, i.e. the water-based single-component tinting base paints have good color stability.

[0123] Table 3: Color difference results of the water-based single-component toning base paint obtained in Examples 1-3 and Comparative Examples 1-2 before and after 30 days of storage at room temperature

[0124] Performance Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Notes Coffee 0.3 0.2 0.1 1.5 1.7 Colorimeter Test Grey Blue 0.1 0.1 0.1 1.3 2.2 Colorimeter Test

[0125] In summary, the water-based single-component toning base paint of the present application has a smooth film, fast drying, good adhesion to various substrates, good color stability after adding water-based color paste, and little or no color change before and after storage. Continuous production is possible during spray application, and the paint can be stacked after being taken off the line, improving the efficiency of site utilization. Therefore, the present application effectively overcomes the various shortcomings of the prior art and has high industrial utilization value.

[0126] In summary, the above is only a preferred example of the present application and does not limit the present application in any form; any minor changes, modifications, and equivalent changes made by those skilled in the art within the scope of the technical solutions of the present application using the disclosed technical content are considered equivalent examples of the present application; at the same time, any equivalent changes, modifications, and evolution of the above examples according to the essential technology of the present application are still within the protection scope of the technical solutions of the present application.

[0127] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0128] Unless otherwise specified, the experimental methods in the present application are generally performed under conventional conditions or according to the conditions recommended by the manufacturer.

[0129] Unless otherwise specified, the various optimized technical solutions in the present application can be combined with each other.

[0130] Unless otherwise specified, percentages and parts are weight percentages and weight parts.

[0131] Unless otherwise specified, the experimental methods in the present application are generally performed under conventional conditions or according to the conditions recommended by the manufacturer.

[0132] Unless otherwise defined, all professional and scientific terms used in the specification and examples have the same meaning as familiar to those skilled in the art. In addition, any method and material similar or equivalent to those described can be applied in the present application.

Claims

1. A water-based, single-component tinting base paint with good color stability, characterized in that: It comprises the following weight percentages: The composition includes: 60-90% aqueous emulsion, 0.5-4% wetting and dispersing agent, 0.2-1.0% defoamer, 0.5-4.0% wax additive, 0.2-3.0% matting agent, 2-8.0% film-forming aid, 0.05-0.5% pH adjuster, 0.5-5% anti-sagging agent pregel, 0.2-3.0% thickener, 0.1-2.0% wetting agent, 0.1-2.0% leveling agent, 3-20% pure water, and 0.01-0.3% bactericide. The sum of all components is 100%. The wetting and dispersing agent is a deflocculating high-molecular-weight polyurethane modified dispersant combined with a high-molecular-weight carboxylate dispersant or a modified carboxylate dispersant. The thickener is a combination of one or two of the following: a high-shear polyurethane thickener and a high-shear polyether modified thickener; or a medium-low shear polyurethane thickener and a medium-low shear polyether modified thickener. The aforementioned anti-sagging agent pregel liquid is prepared by high-speed dispersion of the anti-sagging agent and pure water; The anti-sagging agent is one or a mixture of several of the following: bentonite, montmorillonite, polyamide wax paste, and polyurea paste.

2. The water-based single-component tinting base paint with good color stability according to claim 1, characterized in that: The aqueous emulsion is one or a mixture of several of the following: aqueous acrylic emulsion, aqueous polyurethane-modified acrylic emulsion, and aqueous polyurethane emulsion.

3. The water-based single-component tinting base paint with good color stability according to claim 1, characterized in that: The aqueous emulsion and wetting / dispersing agent combination is as follows: A combination of DSM NeoCryl XK-14 waterborne acrylic emulsion, Alberdingk UC 8400 waterborne polyurethane-modified acrylic emulsion, BASF Dispex Ultra PA 4550 wetting and dispersing agent, and Metolat 388 wetting and dispersing agent; or A combination of Dow Roshield 560 waterborne acrylic emulsion, DSM NeoRez R2180 waterborne polyurethane-modified acrylic emulsion, BASF Dispex Ultra PA 4550 wetting and dispersing agent, and Afcona 5071 wetting and dispersing agent.

4. The water-based single-component tinting base paint with good color stability according to claim 1, characterized in that: The thickener and anti-sagging agent combination is as follows: The product is an anti-sagging pregel liquid made by combining Dow Acrysol RM-2100 high-shear polyurethane thickener with one or a mixture of Hemings Rheolate 299 medium-low shear polyurethane thickener and Wanhua U505 medium-low shear polyurethane thickener, and a mixture of one or a mixture of BYK Laponite RDS montmorillonite, Clayminton LB bentonite, Desparon AQ633E polyamide wax paste and polyurea paste.

5. The water-based single-component tinting base paint with good color stability according to claim 1, characterized in that: It includes one or more of the following features: The film-forming aid is an alcohol ether-based film-forming aid; The defoamer is one or a mixture of several of the following: mineral oil and modified defoamers, molecular-level defoamers, or organosilicon defoamers; The pH adjuster is one of the organic amines; The wetting agent mentioned above is one or a mixture of several of the following: organosilicon wetting agents, acetylation diol wetting agents, super wetting agents, and fluorine-modified wetting agents; The wax additive is one or a mixture of two of the following: wax powder and wax emulsion; The leveling agent is one or a mixture of two of the following: silicone leveling agents and acrylic leveling agents. The bactericide mentioned is a BIT-type bactericide.

6. The water-based single-component tinting base paint with good color stability according to claim 5, characterized in that: The film-forming aid is a combination of propylene glycol, dipropylene glycol methyl ether, dipropylene glycol butyl ether and tripropylene glycol butyl ether; The defoamer mentioned is an organosilicon defoamer; The pH adjuster mentioned is AMP-95; The wetting agent is either TegoWet 270 or Tego twin 4100 combined with DuPont Capstone FS-61.

7. A method for preparing a water-based single-component tinting base paint with good color stability as described in any one of claims 1 to 6, characterized in that: It includes the following preparation steps: A. Take a clean large tank a, select a suitable dispersion disc, the diameter of the dispersion disc should be 0.4-0.6 of the container diameter, filter the aqueous emulsion using an 80-micron filter, then slowly add it to the center of the dispersion disc, start stirring at 800 rpm, add the wetting and dispersing agent and defoamer in a thin stream to the center of the dispersion disc, and slowly add the wax additive and matting powder. B. In a separate clean container b, add the following materials in a thin stream: add some pure water, then add the film-forming aid and pH adjuster in sequence. Select a suitable dispersion device according to the container size, maintain a speed of 600 rpm and disperse for 10 minutes until uniform. Then, aim at the center of the dispersion disc and slowly add the mixture in a thin stream into the large tank a. Increase the speed to 1800 rpm and continue to add the thickener. Disperse for 20 minutes until the fineness is ≤20μm and there is no oil shrinkage on the scraper before proceeding to the next step. C. Slowly add the anti-sagging agent pregel liquid to large tank a, stir for 5 minutes, then reduce the speed to 1200 rpm, and add wetting agent, leveling agent, bactericide and the remaining pure water; continue stirring for 10 minutes until uniform, take a sample to test the appearance of the paint film, and only proceed to the next step after it is qualified; D. Reduce the speed to 400 rpm and stir for 10 minutes; filter and package after passing inspection.

8. The method for preparing the water-based single-component tinting base paint with good color stability according to claim 7, characterized in that: The preparation method of the aforementioned anti-sagging agent pregel liquid is as follows: Take a clean container c, add an appropriate amount of pure water, start stirring at 800 rpm, slowly add the anti-sagging agent to the center of the dispersion plate, increase the stirring speed to 1200 rpm, stir for 30 minutes, and you will get the anti-sagging agent pregel solution.

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