A method for preparing environmentally friendly water-based metallic paint

Abstract

The invention discloses a method for preparing an environmentally friendly water-based metallic paint, and relates to the technical field of preparing an environmentally friendly water-based metallic paint. The method comprises the following steps: 35-55 parts of polyacrylate emulsion, 7-15 parts of antifreeze thickening liquid intermediate, 15-25 parts of deionized water, 5-10 parts of environmentally friendly pigment, 2-7 parts of sodium polycarboxylate, 2-4 parts of polyether modified siloxane, 1-3 parts of fluorocarbon compound, 5-10 parts of water-based aluminum silver paste, 2-6 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1-3 parts of sodium benzoate, and 0.5-1.5 parts of pH regulator. The present invention prepares an environmentally friendly water-based metallic paint by adding an antifreeze thickening liquid intermediate, which can effectively reduce the freezing point of the paint, ensure that the paint will not freeze in a low-temperature environment, thereby maintaining its good fluidity and construction performance, and increase the viscosity and consistency of the paint, prevent the paint from sagging, flowing or splashing during construction, improve the smoothness and covering power of the coating, and reduce the paint stratification after the metallic paint is shaken.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly water-based metallic paint preparation, and in particular to a method for preparing environmentally friendly water-based metallic paint. Background Art

[0002] Environmentally friendly water-based metallic paint is a kind of paint specially designed for metal surfaces. The main solvent is water. It has strong protective ability for metal surfaces, good weather resistance and corrosion resistance, and can effectively prevent rust and corrosion on metal surfaces.

[0003] However, during the production process of water-based metallic paint, due to the characteristics of water-based metallic paint, stratification is prone to occur during use after preparation, resulting in uneven color development of the water-based metallic paint during the coating process, and it is easy to freeze in cold weather, causing inconvenience in the use of water-based metallic paint. At the same time, in the preparation process of water-based metallic paint, it is often necessary to add raw materials in sequence for mixing and stirring. When a certain intermediate raw material is not prepared, it is easy to cause production stagnation, and there are problems of low practicality and functionality.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a method for preparing an environmentally friendly water-based metallic paint to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows:

[0007] An environmentally friendly water-based metallic paint comprises the following raw materials in parts by weight:

[0008] The invention comprises the following raw materials in parts by weight: 35-55 parts of polyacrylate emulsion, 7-15 parts of antifreeze thickening liquid intermediate, 15-25 parts of deionized water, 5-10 parts of environmentally friendly pigment, 2-7 parts of sodium polycarboxylate, 2-4 parts of polyether modified siloxane, 1-3 parts of fluorocarbon compound, 5-10 parts of water-based aluminum silver paste, 2-6 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1-3 parts of sodium benzoate, and 0.5-1.5 parts of pH regulator;

[0009] Wherein, the antifreeze thickening liquid is prepared by the following steps:

[0010] Step 1, polyvinyl alcohol and deionized water are mixed in a container, a stirring device is turned on and the temperature is slowly raised to 90-95° C., and the temperature is maintained and stirred for 1.5 hours to obtain a polyvinyl alcohol solution;

[0011] Step 2: Place ethylene glycol in a container, then slowly drop the prepared polyvinyl alcohol solution into the container containing ethylene glycol and keep stirring. The dropping time is 0.5-1 hour. After the dropping is completed, add sodium hydroxide and continue to stir evenly to obtain an antifreeze thickening liquid intermediate.

[0012] As a preferred embodiment, in the process of preparing the antifreeze thickening liquid intermediate, based on the stirring time and stirring state of the antifreeze thickening liquid intermediate, a stirring preparation generation curve of the antifreeze thickening liquid intermediate is obtained, and the stirring completion time is predicted based on the real-time state of the antifreeze thickening liquid intermediate. The specific steps are:

[0013] Viscometer measures the real-time viscosity data of the antifreeze thickening liquid intermediate during stirring , calculate the mixing time With real-time viscosity data The specific algorithm formula is:

[0014] ;

[0015] in, For the parameters to be determined, by selecting The viscosity data corresponding to different stirring times were used to determine the parameters using the least squares method. The numerical value of is used to obtain the prediction equation for the intermediate of antifreeze thickening fluid.

[0016] As a preferred embodiment, the mass ratio of polyvinyl alcohol to deionized water is 1:16.

[0017] As a preferred embodiment, the mass ratio of polyvinyl alcohol, ethylene glycol and sodium hydroxide used is 1:0.6:0.005.

[0018] A method for preparing an environmentally friendly water-based metallic paint comprises the following preparation steps:

[0019] S1. Weigh the following raw materials by mass: 35-55 parts of polyacrylate emulsion, 7-15 parts of antifreeze thickening liquid intermediate, 15-25 parts of deionized water, 5-10 parts of environmentally friendly pigment, 2-7 parts of sodium polycarboxylate, 2-4 parts of polyether modified siloxane, 1-3 parts of fluorocarbon compound, 5-10 parts of water-based aluminum silver paste, 2-6 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1-3 parts of sodium benzoate, and 0.5-1.5 parts of pH adjuster;

[0020] S2, adding deionized water, sodium polycarboxylate and polyether-modified siloxane into a stirring container and stirring slowly, and continuing stirring to obtain a mixed solution A;

[0021] S3, slowly adding the environmentally friendly pigment to the mixed solution A, continuously stirring to obtain a pigment dispersion, sequentially adding the polyacrylate emulsion, the fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and sodium benzoate to the pigment dispersion, and adding the antifreeze thickening liquid intermediate during the stirring process, stirring to obtain a mixed solution B;

[0022] S4. Slowly add the water-based aluminum silver paste to the mixed solution B, continue stirring to obtain a mixed solution C, add a pH adjuster to the mixed solution C, adjust the pH value to 7-9, and continue stirring to obtain an environmentally friendly water-based metallic paint.

[0023] As a preferred embodiment, S3 includes the following sub-steps:

[0024] S31, Mixing time for collecting environmentally friendly pigments Stirring time with polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, sodium benzoate ;

[0025] S32, combined with the viscosity of the intermediate antifreeze thickening liquid in the current preparation process And the prediction equation of the antifreeze thickening liquid intermediate is used to calculate the addition time node of the antifreeze thickening liquid intermediate in the preparation process. The specific steps and algorithm formula are as follows:

[0026] Based on the target viscosity of the antifreeze thickening fluid intermediate , calculate and obtain the predicted mixing time, and the algorithm formula is:

[0027] ;

[0028] in, To predict the stirring time, combine the current antifreeze thickening liquid intermediate to prepare the real-time stirring time , calculate the time difference ;

[0029] The time when the environmentally friendly pigment starts to stir is used to calculate the time difference of the intermediate of the antifreeze thickening liquid when the environmentally friendly pigment is stirred at the current moment. ,when When the antifreeze thickening liquid intermediate in preparation is directly added;

[0030] when , then after the polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and sodium benzoate are stirred, add the prepared antifreeze thickening liquid intermediate.

[0031] As a preferred embodiment, the stirring speed of the deionized water, sodium polycarboxylate and polyether-modified siloxane in S2 is 500-800 rpm, and the stirring time is 10-15 minutes.

[0032] As a preferred embodiment, the stirring speed of the environmentally friendly pigment and the mixed liquid A in S3 is 1000-1500 rpm, and the stirring time is 20-30 minutes. The stirring speed of the polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and sodium benzoate is 800-1200 rpm, and the stirring time is 15-25 minutes.

[0033] As a preferred embodiment, the stirring time of the aqueous aluminum-silver paste and the mixed solution B in S4 is 5-10 minutes, the stirring speed is 300-500 rpm, and the stirring time after adding the pH adjuster is 10-15 minutes.

[0034] The beneficial effects of the present invention are:

[0035] The present invention prepares an environmentally friendly water-based metallic paint by adding an antifreeze thickening liquid intermediate to polyacrylate emulsion, deionized water, environmentally friendly pigment, sodium salt of polycarboxylate, polyether-modified siloxane, fluorocarbon compound, water-based aluminum silver paste, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, sodium benzoate, and pH regulator. The freezing point of the paint can be effectively reduced to ensure that the paint will not freeze in a low-temperature environment, thereby maintaining good fluidity and construction performance, and increasing the viscosity and consistency of the paint to prevent the paint from sagging, flowing or splashing during construction, thereby improving the smoothness and covering power of the coating and reducing the stratification of the paint after the metallic paint is shaken.

[0036] The present invention predicts and analyzes the preparation time of an antifreeze thickening liquid intermediate in a preparation process, measures the viscosity of the antifreeze thickening liquid intermediate in production during the preparation process of an environmentally friendly water-based metallic paint, so as to predict the remaining preparation time of the antifreeze thickening liquid intermediate, and determines the addition state of the antifreeze thickening liquid intermediate in combination with the stirring time of the environmentally friendly pigment, polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and sodium benzoate in the current production process, so as to select the antifreeze thickening liquid intermediate that has been prepared or the antifreeze thickening liquid intermediate that has not been prepared to be added during the production process, which helps to optimize the actual production process and improve the functionality and practicality of the metallic paint preparation method;

[0037] The present invention can reasonably arrange production steps, reduce waiting time and uncertainty in production links, improve production efficiency, adjust the production process in real time, and avoid production problems caused by insufficient material preparation by selecting the adding state of the antifreeze thickening liquid intermediate. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 This is a flow chart of a method for preparing an environmentally friendly water-based metallic paint according to an embodiment of the present invention;

[0040] Figure 2 It is a curve diagram of the viscosity of the antifreeze thickener changing with time in a method for preparing an environmentally friendly water-based metallic paint according to an embodiment of the present invention;

[0041] Figure 3 The relationship curve between the antifreeze thickening liquid intermediate and the mixed liquid B in the preparation method of an environmentally friendly water-based metallic paint according to the embodiment of the present invention is Figure 1 ;

[0042] Figure 4 The relationship curve between the antifreeze thickening liquid intermediate and the mixed liquid B in the preparation method of an environmentally friendly water-based metallic paint according to the embodiment of the present invention is Figure 2 . DETAILED DESCRIPTION

[0043] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0044] According to an embodiment of the present invention, a method for preparing an environmentally friendly water-based metallic paint is provided.

[0045] The present invention is further described with reference to the accompanying drawings and specific embodiments:

[0046] Embodiment 1:

[0047] An environmentally friendly water-based metallic paint according to an embodiment of the present invention comprises the following raw materials in parts by weight: 35-55 parts of polyacrylate emulsion, 7-15 parts of antifreeze thickening liquid intermediate, 15-25 parts of deionized water, 5-10 parts of environmentally friendly pigment, 2-7 parts of sodium polycarboxylate, 2-4 parts of polyether-modified siloxane, 1-3 parts of fluorocarbon compound, 5-10 parts of water-based aluminum silver paste, 2-6 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1-3 parts of sodium benzoate, and 0.5-1.5 parts of pH regulator;

[0048] The antifreeze thickening liquid is prepared by the following steps:

[0049] Step 1, polyvinyl alcohol and deionized water are mixed in a container, a stirring device is turned on and the temperature is slowly raised to 90-95° C., and the temperature is maintained and stirred for 1.5 hours to obtain a polyvinyl alcohol solution;

[0050] Step 2, placing ethylene glycol in a container, then slowly dropping the prepared polyvinyl alcohol solution into the container containing ethylene glycol and stirring for 0.5-1 hour, adding sodium hydroxide after the dropping is completed, and continuing to stir evenly to obtain an antifreeze thickening liquid intermediate;

[0051] In the preparation process of the antifreeze thickening liquid intermediate, based on the stirring time and stirring state of the antifreeze thickening liquid intermediate, the stirring preparation generation curve of the antifreeze thickening liquid intermediate is obtained, and the stirring completion time is predicted based on the real-time state of the antifreeze thickening liquid intermediate. The specific steps are:

[0052] Viscometer measures the real-time viscosity data of the antifreeze thickening liquid intermediate during stirring , calculate the mixing time With real-time viscosity data The specific algorithm formula is:

[0053] ;

[0054] in, For the parameters to be determined, by selecting The viscosity data corresponding to different stirring times were used to determine the parameters using the least squares method. The numerical value of is used to obtain the prediction equation for the intermediate of antifreeze thickening fluid.

[0055] It should be noted that The value is usually set to 7 to determine Numerical, and after the relationship equation is established, it needs to be obtained in real time by random selection and mixing time , verify and calibrate the relationship equation, and reset it when the numerical deviation is too large The numerical value of is used to calculate the relationship equation.

[0056] A method for preparing an environmentally friendly water-based metallic paint comprises the following preparation steps:

[0057] S1. Weigh the following raw materials by mass: 35-55 parts of polyacrylate emulsion, 7-15 parts of antifreeze thickening liquid intermediate, 15-25 parts of deionized water, 5-10 parts of environmentally friendly pigment, 2-7 parts of sodium polycarboxylate, 2-4 parts of polyether modified siloxane, 1-3 parts of fluorocarbon compound, 5-10 parts of water-based aluminum silver paste, 2-6 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1-3 parts of sodium benzoate, and 0.5-1.5 parts of pH adjuster;

[0058] S2, adding deionized water, sodium polycarboxylate and polyether-modified siloxane into a stirring container and stirring slowly, and continuing stirring to obtain a mixed solution A;

[0059] S3, slowly adding the environmentally friendly pigment to the mixed solution A, continuously stirring to obtain a pigment dispersion, sequentially adding the polyacrylate emulsion, the fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and sodium benzoate to the pigment dispersion, and adding the antifreeze thickening liquid intermediate during the stirring process, stirring to obtain a mixed solution B;

[0060] S31, Mixing time for collecting environmentally friendly pigments Stirring time with polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, sodium benzoate ;

[0061] S32, combined with the viscosity of the intermediate antifreeze thickening liquid in the current preparation process And the prediction equation of the antifreeze thickening liquid intermediate is used to calculate the addition time node of the antifreeze thickening liquid intermediate in the preparation process. The specific steps and algorithm formula are as follows:

[0062] Based on the target viscosity of the antifreeze thickening fluid intermediate , calculate and obtain the predicted mixing time, and the algorithm formula is:

[0063] ;

[0064] in, To predict the stirring time, combine the current antifreeze thickening liquid intermediate to prepare the real-time stirring time , calculate the time difference ;

[0065] The time when the environmentally friendly pigment starts to stir is used to calculate the time difference of the intermediate of the antifreeze thickening liquid when the environmentally friendly pigment is stirred at the current moment. ,when When the antifreeze thickening liquid intermediate in preparation is directly added;

[0066] when , then after the polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and sodium benzoate are stirred, add the prepared antifreeze thickening liquid intermediate.

[0067] It should be noted that by predicting the stirring time of the antifreeze thickening liquid intermediate, according to the stirring start time of the environmentally friendly pigment, the time difference of the antifreeze thickening liquid intermediate when the environmentally friendly pigment is stirred at the current moment is calculated. , compared with the processing In order to determine the state of the antifreeze thickening liquid intermediate added in the production process, the antifreeze thickening liquid intermediate in preparation can be added during the preparation of environmentally friendly water-based metallic paint to reduce unnecessary stirring time, make the production process more coherent, and avoid production stagnation when the antifreeze thickening liquid intermediate is not prepared. In order to optimize the actual production process, the target viscosity of the antifreeze thickening liquid intermediate is mPa·s.

[0068] S4. Slowly add the water-based aluminum silver paste to the mixed solution B, continue stirring to obtain a mixed solution C, add a pH adjuster to the mixed solution C, adjust the pH value to 7-9, and continue stirring to obtain an environmentally friendly water-based metallic paint.

[0069] Embodiment 2:

[0070] An environmentally friendly water-based metallic paint is prepared by the following steps:

[0071] The first step is to weigh the following raw materials by mass: 45 parts of polyacrylate emulsion, 10 parts of antifreeze thickening liquid intermediate, 22 parts of deionized water, 7 parts of environmentally friendly pigment, 5 parts of sodium polycarboxylate, 3 parts of polyether modified siloxane, 1 part of fluorocarbon compound, 6 parts of water-based aluminum silver paste, 4 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1.5 parts of sodium benzoate, and 0.85 parts of pH regulator;

[0072] Step 2: Add 22 parts of deionized water, 5 parts of sodium polycarboxylate, and 3 parts of polyether-modified siloxane into a stirring container, and stir at 650 rpm for 10-15 minutes to fully mix them to obtain a mixed solution A;

[0073] Step 3: slowly add 7 parts of environmentally friendly pigment to mixed solution A, increase the speed to 1200 rpm, stir for 23 minutes to ensure that the pigment is evenly dispersed, and obtain a pigment dispersion; add 45 parts of polyacrylate emulsion, 1 part of fluorocarbon compound, 4 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.5 parts of sodium benzoate to the pigment dispersion in sequence, stir at a speed of 1100 rpm for 17 minutes to fully mix the components, and calculate the state of the added 10 parts of antifreeze thickening liquid intermediate based on the viscosity of the antifreeze thickening liquid intermediate during the stirring process, and stir to obtain a mixed solution B;

[0074] Step 4: slowly add 6 parts of water-based aluminum paste to mixed solution B at a stirring speed of 450 rpm, stir for 5-10 minutes to prevent aluminum paste from agglomerating, continue stirring to obtain mixed solution C, add 0.85 parts of pH adjuster to mixed solution C, adjust the pH value to 7-9, continue stirring for 10-15 minutes to obtain environmentally friendly water-based metallic paint;

[0075] It should be noted that in the third step, the stirring time obtained based on the number of parts of the environmentally friendly pigment is , combined with Figure 2 Obtain target viscosity Predicted stirring time of antifreeze thickening liquid intermediate under , based on the antifreeze thickening liquid intermediate state selection table, determine the state of the antifreeze thickening liquid intermediate to be added:

[0076] Table 1 Antifreeze thickening liquid intermediate state selection table

[0077]

[0078] In conjunction with the instruction manual Figure 3 As shown in Table 1, the real-time stirring time for the preparation of the current antifreeze thickening liquid intermediate is When the time is greater than or equal to 16.3 minutes, the antifreeze thickening liquid intermediate being prepared can be directly added to prepare the mixed liquid B, thereby omitting the time for waiting for the preparation of the antifreeze thickening liquid to be completed, thereby optimizing the production process.

[0079] Embodiment 3:

[0080] An environmentally friendly water-based metallic paint is prepared by the following steps:

[0081] The first step is to weigh the following raw materials by mass: 37 parts of polyacrylate emulsion, 12 parts of antifreeze thickening liquid intermediate, 18 parts of deionized water, 5 parts of environmentally friendly pigment, 3 parts of sodium polycarboxylate, 2 parts of polyether modified siloxane, 2 parts of fluorocarbon compound, 7 parts of water-based aluminum silver paste, 4 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1.5 parts of sodium benzoate, and 0.85 parts of pH regulator;

[0082] Step 2: 18 parts of deionized water, 3 parts of sodium polycarboxylate, and 2 parts of polyether-modified siloxane are added into a stirring container, and stirred at 750 rpm for 10-15 minutes to fully mix them to obtain a mixed solution A;

[0083] Step 3: Slowly add 5 parts of environmentally friendly pigment to mixed solution A, increase the speed to 1300 rpm, stir for 21 minutes to ensure that the pigment is evenly dispersed, and obtain a pigment dispersion. Add 37 parts of polyacrylate emulsion, 2 parts of fluorocarbon compound, 4 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and 1.5 parts of sodium benzoate to the pigment dispersion in sequence, stir at a speed of 1000 rpm for 15 minutes to fully mix the components, and calculate the state of the added 12 parts of antifreeze thickening liquid intermediate based on the viscosity of the antifreeze thickening liquid intermediate during the stirring process, and stir to obtain a mixed solution B;

[0084] Step 4: slowly add 7 parts of water-based aluminum paste to mixed solution B at a stirring speed of 450 rpm, stir for 5-10 minutes to prevent aluminum paste from agglomerating, continue stirring to obtain mixed solution C, add 0.85 parts of pH regulator to mixed solution C, adjust the pH value to 7-9, continue stirring for 10-15 minutes to obtain environmentally friendly water-based metallic paint;

[0085] It should be noted that in the third step, the stirring time obtained based on the number of parts of the environmentally friendly pigment is , combined with Figure 2 Obtain target viscosity Predicted stirring time of antifreeze thickening liquid intermediate under , based on the antifreeze thickening liquid intermediate state selection table, determine the state of the antifreeze thickening liquid intermediate to be added:

[0086] Table 2 Antifreeze thickening liquid intermediate state selection table

[0087]

[0088] In conjunction with the instruction manual Figure 4 As shown in Table 2, the real-time stirring time of the current antifreeze thickening liquid intermediate preparation is When the time is greater than or equal to 20.3 minutes, the antifreeze thickening liquid intermediate being prepared can be directly added, thereby omitting the time of waiting for the preparation of the antifreeze thickening liquid intermediate.

[0089] Experimental Example 1:

[0090] Take 15 ml of each sample of the environmentally friendly water-based metallic paint obtained in Examples 2-3 and place them in clean test tubes. Place the test tubes containing the environmentally friendly water-based metallic paint samples in a refrigerator and insert a Beckman thermometer into the test tube to ensure that the temperature-sensing part of the thermometer is completely immersed in the sample.

[0091] The temperature of the sample is lowered by 1°C per minute, and the temperature change of the sample is recorded over time until the temperature stops decreasing and starts to rise again. The highest point of the temperature rise is observed and recorded, which is the freezing point of the sample. The test results are shown in Table 3:

[0092] Table 3

[0093]

[0094] As can be seen from Table 3, the freezing point of Example 3 is about -14.60°C, which is lower than that of Example 2, indicating that its antifreeze performance is better. It can be seen that the amount of the environmentally friendly water-based metallic paint antifreeze thickening liquid intermediate prepared by the present invention can affect the freezing point of the environmentally friendly water-based metallic paint, and the increase in the amount of the antifreeze thickening liquid intermediate can further enhance its antifreeze effect;

[0095] Experimental Example 2:

[0096] Take 75 ml of the environmentally friendly water-based metallic paint obtained in Examples 2-3, respectively, and place them in clean transparent glass bottles. Ensure that the containers are well sealed. Place the glass bottles containing the samples at room temperature of 25±2°C, avoid light and vibration, and record the stratification time, that is, the time when the samples begin to show obvious stratification. The test results are shown in Table 4:

[0097] Table 4

[0098]

[0099] It can be seen from Table 4 that in the delamination test, the stability of Example 3 is better than that of Example 2. The delamination time of Example 3 is 18.97 hours, which is longer than that of Example 2, indicating that it has strong stability. It can be seen that the amount of the antifreeze thickening liquid intermediate of the environmentally friendly water-based metallic paint prepared by the present invention can affect the delamination time of the environmentally friendly water-based metallic paint. Increasing the amount of the antifreeze thickening liquid intermediate can increase the viscosity of the environmentally friendly water-based metallic paint. Higher viscosity can reduce the flow of the paint, make the coating more uniform, and prevent the paint from sagging, flowing or splashing during construction, thereby improving the smoothness and covering power of the coating.

[0100] Comparative Example 1:

[0101] This comparative example is Hempel brand water-based acrylic paint metallic paint;

[0102] The environmentally friendly water-based metallic paints obtained in Examples 2-3 and Comparative Example 1 were tested as in Experimental Examples 1-2. The results are shown in Tables 5 and 6:

[0103] Table 5

[0104]

[0105] Table 6

[0106]

[0107] It can be seen from Table 5 that the anti-freezing ability of the environmentally friendly water-based metallic paint obtained in Examples 2-3 of the present invention is better than that of the commercially available water-based acrylic paint metallic paint. It can be seen from Table 6 that the anti-delamination ability of the environmentally friendly water-based metallic paint obtained in Examples 2-3 of the present invention is better than that of the commercially available water-based acrylic paint metallic paint.

[0108] In summary, the present invention adds an antifreeze thickening liquid intermediate to polyacrylate emulsion, deionized water, environmentally friendly pigment, sodium salt of polycarboxylate, polyether-modified siloxane, fluorocarbon compound, aqueous aluminum silver paste, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, sodium benzoate, and pH regulator to prepare an environmentally friendly water-based metallic paint, which can effectively reduce the freezing point of the paint, ensure that the paint will not freeze in a low temperature environment, thereby maintaining its good fluidity and construction performance, and increase the viscosity and consistency of the paint, prevent the paint from sagging, flowing or splashing during construction, improve the smoothness and covering power of the coating, and reduce the coating stratification after the metallic paint is shaken;

[0109] The preparation time of the antifreeze thickening liquid intermediate in the preparation process is predicted and analyzed, and the viscosity of the antifreeze thickening liquid intermediate in production is measured during the preparation process of the environmentally friendly water-based metallic paint to predict the remaining preparation time of the antifreeze thickening liquid intermediate. Combined with the stirring time of the environmentally friendly pigment, polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and sodium benzoate in the current production process, the addition state of the antifreeze thickening liquid intermediate is determined, so as to choose to add the prepared antifreeze thickening liquid intermediate or the unprepared antifreeze thickening liquid intermediate in the production process, which is helpful to optimize the actual production process and improve the functionality and practicality of the metallic paint preparation method. By selecting the addition state of the antifreeze thickening liquid intermediate, the production steps can be reasonably arranged, the waiting time and the uncertainty in the production link can be reduced, the production efficiency can be improved, the production process can be adjusted in real time, and the production problems caused by insufficient material preparation can be avoided.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing an environmentally friendly water-based metallic paint, characterized in that: The method comprises the following preparation steps: S1. Weigh the following raw materials by mass: 35-55 parts of polyacrylate emulsion, 7-15 parts of antifreeze thickening liquid intermediate, 15-25 parts of deionized water, 5-10 parts of environmentally friendly pigment, 2-7 parts of sodium polycarboxylate, 2-4 parts of polyether modified siloxane, 1-3 parts of fluorocarbon compound, 5-10 parts of water-based aluminum silver paste, 2-6 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1-3 parts of sodium benzoate, and 0.5-1.5 parts of pH adjuster; S2, adding deionized water, sodium polycarboxylate and polyether-modified siloxane into a stirring container and stirring slowly, and continuing stirring to obtain a mixed solution A; S3, slowly adding the environmentally friendly pigment to the mixed solution A, continuously stirring to obtain a pigment dispersion, sequentially adding the polyacrylate emulsion, the fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, and sodium benzoate to the pigment dispersion, and adding the antifreeze thickening liquid intermediate during the stirring process, stirring to obtain a mixed solution B; S4, slowly adding the water-based aluminum silver paste to the mixed solution B, continuously stirring to obtain a mixed solution C, adding a pH adjuster to the mixed solution C, adjusting the pH value to 7-9, and continuously stirring to obtain an environmentally friendly water-based metallic paint; Wherein, the antifreeze thickening liquid intermediate is prepared by the following steps: Step 1, polyvinyl alcohol and deionized water are mixed in a container, a stirring device is turned on and the temperature is slowly raised to 90-95° C., and the temperature is maintained at 90-95° C. and stirred for 1.5 hours to obtain a polyvinyl alcohol solution; Step 2, placing ethylene glycol in a container, and then slowly dropping the polyvinyl alcohol solution prepared in step 1 into the container containing ethylene glycol while stirring, the dropping time is 0.5-1 hour, after the dropping is completed, adding sodium hydroxide, and continuing to stir evenly to obtain an antifreeze thickening liquid intermediate; In the preparation process of the antifreeze thickening liquid intermediate, based on the stirring time and stirring state of the antifreeze thickening liquid intermediate, the stirring preparation generation curve of the antifreeze thickening liquid intermediate is obtained, and the stirring completion time is predicted based on the real-time state of the antifreeze thickening liquid intermediate. The specific steps are: Viscometer measures the real-time viscosity data of the antifreeze thickening liquid intermediate during stirring , calculate the mixing time With real-time viscosity data The specific algorithm formula is: ； in, For the parameters to be determined, by selecting The viscosity data corresponding to different stirring times were used to determine the parameters using the least squares fitting method. The numerical value of antifreeze thickening fluid intermediate prediction equation is obtained; S3 includes the following steps: S31, Mixing time for collecting environmentally friendly pigments Stirring time with polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, sodium benzoate ; S32, combined with the viscosity of the intermediate antifreeze thickening liquid in the current preparation process And the prediction equation of the antifreeze thickening liquid intermediate is used to calculate the addition time node of the antifreeze thickening liquid intermediate in the preparation process. The specific steps and algorithm formula are as follows: Based on the target viscosity of the antifreeze thickening fluid intermediate , calculate and obtain the predicted mixing time, and the algorithm formula is: ； in, To predict the stirring time, combine the current antifreeze thickening liquid intermediate to prepare the real-time stirring time , calculate the time difference ; The time when the environmentally friendly pigment starts to stir is used to calculate the time difference of the intermediate of the antifreeze thickening liquid when the environmentally friendly pigment is stirred at the current moment. ,when When the antifreeze thickening liquid intermediate in preparation is directly added; when , then after the polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and sodium benzoate are stirred, add the prepared antifreeze thickening liquid intermediate.

2. The method for preparing an environmentally friendly water-based metallic paint according to claim 1, characterized in that: The mass ratio of polyvinyl alcohol to deionized water used in step 1 is 1:

16.

3. The method for preparing an environmentally friendly water-based metallic paint according to claim 1, characterized in that: The mass ratio of the polyvinyl alcohol solution, ethylene glycol and sodium hydroxide used in step 2 is 1:0.6:0.

005.

4. The method for preparing an environmentally friendly water-based metallic paint according to claim 1, characterized in that: The stirring speed of the deionized water, sodium polycarboxylate and polyether-modified siloxane in S2 is 500-800 rpm, and the stirring time is 10-15 minutes.

5. The method for preparing an environmentally friendly water-based metallic paint according to claim 1, characterized in that: The environmentally friendly pigment and the mixed solution A in S3 are stirred at a speed of 1000-1500 rpm for 20-30 minutes, and the polyacrylate emulsion, fluorocarbon compound, 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate and sodium benzoate are stirred at a speed of 800-1200 rpm for 15-25 minutes.

6. The method for preparing an environmentally friendly water-based metallic paint according to claim 1, characterized in that: The stirring time of the aqueous aluminum-silver paste and the mixed solution B in S4 is 5-10 minutes, the stirring speed is 300-500 rpm, and the stirring time after adding the pH adjuster is 10-15 minutes.

7. An environmentally friendly water-based metallic paint, prepared by the method for preparing an environmentally friendly water-based metallic paint according to any one of claims 1 to 6, characterized in that: The invention comprises the following raw materials in parts by weight: 35-55 parts of polyacrylate emulsion, 7-15 parts of antifreeze thickening liquid intermediate, 15-25 parts of deionized water, 5-10 parts of environmentally friendly pigment, 2-7 parts of sodium salt of polycarboxylate, 2-4 parts of polyether modified siloxane, 1-3 parts of fluorocarbon compound, 5-10 parts of water-based aluminum silver paste, 2-6 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 1-3 parts of sodium benzoate and 0.5-1.5 parts of pH regulator.

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