CN117683414A - A kind of water-based color masterbatch composition containing aluminum powder pigment - Google Patents

Abstract

The invention discloses a water-based color masterbatch composition containing aluminum powder pigment. In parts by weight, it includes: 10 to 50 parts of mixed resin, 4 to 12 parts of aluminum powder pigment, and 0.8 to 6 parts of aluminum powder pigment wrapping protective agent. , 0.01 to 5 parts of anti-rust pigment, 1 to 12 parts of additives, 3 to 10 parts of solvent, 15 to 50 parts of deionized water, and the total weight of the above components is 100 parts. The water-based color masterbatch composition containing aluminum powder pigments improves the problems of blackening and gas expansion of aluminum powder pigments in water-based paints, has high stability, metallic texture and brightness, and satisfies the water-based environmental protection requirements of the automotive repair paint industry. and excellent appearance. The present invention also relates to a method for preparing the above-mentioned aqueous color masterbatch composition containing aluminum powder pigment.

Description

A kind of water-based color masterbatch composition containing aluminum powder pigment

Technical field

The present invention relates to the technical field of coatings, specifically to coating compositions related to automobile refinishing paints, especially water-based color paint compositions in multi-layer water-based repair paints and water-based color masterbatch compositions containing aluminum powder pigments, as well as the above-mentioned Methods of Preparing the Compositions.

Background technique

Due to accident damage or natural aging, the exterior coating of a car needs to be partially repaired or repainted. This process is also called car repair. Driven by domestic environmental protection policies and the development of international coating technology, water-based automotive refinishing paint has developed rapidly. Western European countries have mandated the popularization of water-based refinishing paint through laws and regulations. The water-based refinishing paint has reached almost 100%. North American countries have The conversion rate of water-based paint has also reached more than 40%. Although the market share of water-based paint in Asia is currently lower than that of Europe and the United States, its growth rate is rapid, especially in the Chinese market. The growth rate of water-based paint has led the world as a whole. It is expected that In the future, it will become the world's most important water-based refinishing paint market.

Automotive refinishing paint products usually include relatively large product series, such as primer product series to protect the substrate and prevent rust, mid-coat product series to improve flatness and stone chip resistance, and master paints to provide color appearance effects. series, as well as varnish product series that provide gloss and fullness, and dozens or even hundreds of color masterbatches and auxiliary products. In actual repair operations, it is necessary to obtain the color formula from the formula platform based on different repair colors, then add color masterbatch according to the recommended formula to mix the color, and finally add necessary auxiliary materials to complete the spraying operation. Therefore, for refinishing paint products, the stability of the product, especially the stability of the color masterbatch composition, is crucial. The color deviation of any color masterbatch will cause color errors in the entire color mixing system, ultimately affecting product delivery and customer satisfaction. satisfaction level.

Among commercial automotive coatings, metallic paints account for a relatively high proportion of the market. In particular, aluminum powder, as the main metallic pigment, is widely used in water-based coatings. Due to the instability of aluminum powder in the water phase, the aluminum powder in the pigment will slowly react with water to release hydrogen. This phenomenon will also cause the aluminum powder pigment to gradually turn black and lose its metallic texture. At the same time, since the shelf life of automotive refinishing paint products is usually much longer than that of other conventional water-based paint products (usually more than 2 years), this also poses a huge challenge to the safety of sealed water-based refinishing paint and the long-term stability of coating products.

In the existing technology, there are several main solutions to solve the stability problem of aluminum powder in aqueous systems. For example, patent US5151125 proposes a water-based coating composition containing aluminum powder. The composition is made of copolymerization of unsaturated monomers and phosphate ester monomers. Although it can reduce the gas emission of aluminum powder, it improves the gas emission of aluminum powder. Gas stability is limited. Patent EP0170474 introduces a method of using epoxy-containing phosphoric acid polymer to wrap aluminum powder to improve the gas generation stability of aluminum powder, but the improvement effect is limited. Suppliers of aluminum powder pigments currently on the market have also introduced silicon-coated aluminum powders for water-based coatings, such as ECKART's StapaHydrolan series, SILBERLINE's AQ series aluminum powders, etc. However, due to the relatively high cost of silicon-coated aluminum powder High, the current average price is about 3 times that of conventional aluminum powder products, and after the aluminum powder is coated with silicon, its surface metal texture will decrease, affecting the final appearance effect, resulting in silicon-coated aluminum powder being unable to meet the requirements. the needs of industry development.

In view of this, the present invention is mainly aimed at the color masterbatch, which is an important component of the water-based repair paint coating system, and aims to provide a water-based color masterbatch composition containing aluminum powder pigments, which has high long-term stability and ensures that it can be used during use. The viscosity will not thicken significantly during the cycle, and there will be no quality and safety issues caused by obvious gas expansion. At the same time, it maintains excellent metallic texture and brightness, meeting the quality requirements for automotive repair.

Contents of the invention

Based on the above facts, the object of the present invention is to provide a water-based color masterbatch composition containing aluminum powder pigment, which improves the current water-based aluminum powder pigment masterbatch by using an aluminum powder compound containing phosphate as a passivator of the aluminum powder pigment. The technical problem of poor storage can effectively avoid the gas generation phenomenon of water-based aluminum powder paint masterbatch during long-term storage, and the aluminum powder will not appear discoloration, brightness reduction and other problems caused by blackening after long-term storage.

The first aspect of the present invention provides an aqueous color masterbatch composition containing aluminum powder pigment, the components of which, in parts by weight, include:

The total weight of the above components is 100 parts.

mixed resin

In the present invention, the mixed resin includes a physically cured or self-crosslinking polymer and a water-dispersed resin. The compounding of the two compositions can better realize the drying of the polymer to form a film through the volatilization of solvent and water, which meets the needs of automobiles. The need for physical drying methods in refinish paint products.

In parts by weight, the mixed resin contains:

Physical curing or self-crosslinking polymer 5 to 25 parts

Water-dispersed resin 5 to 25 parts

The total weight of each of the above components is 10 to 50 parts.

Further, the physically cured or self-crosslinking polymer is preferably one or a combination of physically cured polyurethane dispersion or self-crosslinking polyurethane. Selecting physically curing polyurethane dispersion or self-crosslinking polyurethane as the main film-forming resin can The coating obtains excellent mechanical properties and medium resistance of the coating film; the water-dispersed resin can be selected from water-dispersed acrylic emulsion, water-based polyurethane dispersion, water-based polyester resin, water-based epoxy resin and their modified polymers One or more of the modified polymers include but are not limited to acrylic modified polyurethane dispersion, polyester modified polyurethane dispersion, epoxy modified acrylic emulsion, polyester modified acrylic acid, etc.

Specifically, the physically cured or self-crosslinking polymer is selected from the group consisting of U4000, One or a combination of polyurethane resins of U9800 (both purchased from Opeltech). The water-dispersed resin includes but is not limited to acrylic emulsion model Setaqua6803 (purchased from Allnex).

Aluminum powder pigment

In some embodiments of the present invention, the aluminum powder pigment can be selected from pure aluminum pigments without surface treatment or pre-treated aluminum powder pigments that can be used in water-based coatings. The particle size of the aluminum powder is determined according to the needs of color development. , the preferred particle size is 5 to 50 μm.

It should be noted that after the aluminum powder pigment is ball milled into flake powder, lubricants such as stearic acid and oleic acid need to be used to protect its surface. Therefore, the aluminum powder pigment cannot be directly dispersed in a water-based system.

Specifically, the aluminum powder pigment includes but is not limited to aluminum silver paste model SPARKLE SILVER PREMIER 353 (purchased from Xingbolian Company).

Aluminum powder pigment coating protective agent

In some embodiments of the present invention, the aluminum powder pigment coating protective agent is a block copolymer of epoxy or acrylic acid and phosphate ester. This type of phosphate-based compound can effectively inhibit the corrosion of aluminum powder pigments in water-based coating compositions. , can improve the anti-gassing properties of water-based color masterbatch compositions and meet the short-term corrosion resistance requirements of aluminum powder pigments.

In some preferred embodiments of the present invention, the amount of the aluminum powder pigment wrapping protective agent is related to the amount and surface area of the aluminum powder pigment, and is preferably 20% to 60% of the aluminum powder pigment content, and more preferably, is aluminum powder. 30~50% of pigment content.

Specifically, the aluminum powder pigment coating protective agent includes but is not limited to the aluminum powder coating protective agent model Lubrizol 2062 (purchased from Lubrizol Corporation).

Anti-rust pigment

In some embodiments of the present invention, the anti-rust pigment is selected from one of aluminum polyphosphate, zinc, calcium, strontium and their modifiers and aluminum orthophosphate, zinc, calcium, strontium and their modifiers. Or several. The anti-rust pigment can form complex ions on the surface of the aluminum powder base material, covering the corrosion active points, thereby effectively inhibiting and slowing down the corrosion of the aluminum powder material, and playing a protective role in preventing the aluminum powder pigment from rusting.

It should be noted that the anti-rust pigment is generally obtained in powder form. Before being added to the formula, it needs to be dispersed to a finer particle size through the above-mentioned solvents and dispersants to obtain better protective effects and topcoats. Appearance.

Specifically, the anti-rust pigments are selected from the group consisting of Halox430, HaloxSZP-391 (all purchased from Hex Company of the United States), K-white#82, K-white#84S, and K-white#105 (all purchased from Imperial Chemical Corporation of Japan), ZP-10,/> One or more of the anti-rust pigments from CAPP (all purchased from Kaibai Company).

Auxiliary

In the present invention, the auxiliary agents include dispersants, defoaming agents, wetting agents, thickeners, and pH adjusters. Among them, the addition of dispersant can make aluminum powder and anti-rust pigments better dispersed in the water-based system; defoaming agent can improve the bubble problem in the production process of water-based paint, and avoid dark bubbles, pinholes and other surfaces during the film formation process. Defects, wetting agents can promote the wetting of the substrate by the coating and prevent shrinkage problems caused by contamination of the substrate. Thickeners can improve the storage stability and construction application effect of water-based color masterbatch compositions; pH adjusters are used to adjust the pH value of the coating system.

In parts by weight, the additives include:

The total weight of each of the above components is 1 to 12 parts.

Specifically, the dispersant includes but is not limited to one of the dispersants with models BYK190, BYK191, BYK182 (all purchased from BYK, Germany), Tego752W, Tego755W, and Tego757W (all purchased from Digo) or Several; preferably, the amount of the dispersant is 1% to 40% of the content of the aluminum powder pigment; more preferably, the amount of the dispersant is 15% to 20% of the content of the aluminum powder pigment.

The thickener is selected from polyurethane-associated acrylic emulsion, alkali-swellable acrylic emulsion, hydrophobically modified alkali-swellable acrylic emulsion, polyamide wax, modified ethylene-vinyl acetate copolymer wax emulsion, fumed silica, layer One or more of the silicates in the form of Purchased from Dow Corporation of the United States), RHEOVISAS1130 (purchased from BASF Corporation), DISPARLONAQ-600 (purchased from Disparon Corporation of Japan), AQUATIX8421 (purchased from BYK Corporation of Germany), AEROSIL200 (purchased from Evonik Corporation of Germany) One or more thickeners.

The defoaming agent, wetting agent, and pH regulator are conventional water-based additives selected by professionals in the field. For example, the defoaming agent includes but is not limited to the defoaming agent model BYK028 (purchased from BYK, Germany). , the wetting agent includes but is not limited to the wetting agent model Wet245 (purchased from Digao Company), and the pH adjuster includes but is not limited to 10% dimethylethanolamine aqueous solution, etc.

Solvent

In the present invention, the role of the solvent is to better disperse the aluminum powder pigment in the aqueous system. It can be seen from the above that after the aluminum powder pigment is ball milled into flake powder, it needs to be surface protected with lubricants such as stearic acid and oleic acid. It cannot be directly dispersed in a water-based system and needs to be pre-prepared by soaking it in a solvent. Dispersion, since the amount of solvent will affect the VOC content of the product, the amount of solvent should be reduced as much as possible while meeting the product performance requirements.

In some embodiments of the present invention, the solvent is selected from one or more of alcohols, ethers, and ketone solvents. Preferably, the solvent is selected from ethanol, n-propanol, isopropyl alcohol, butyl alcohol, etc. Alcohol, n-pentanol, n-hexanol, isooctyl alcohol, propylene glycol methyl ether, propylene glycol butyl ether, diacetone alcohol, ethylene glycol butyl ether, ethylene glycol isooctyl ether, diethylene glycol methyl ether, dipropylene glycol methyl ether one or several kinds.

The second aspect of the present invention provides a method for preparing the aqueous color masterbatch composition containing aluminum powder pigment according to the first aspect of the present invention, which includes the following steps:

(1) Put the mixed resin into stainless steel container A, add part of the deionized water, part of the pH adjuster, part of the defoaming agent and the wetting agent in sequence under stirring at 400 to 600 r/min, stir for 20 to 30 minutes, and then use Part of the thickener adjusts the viscosity of the resulting mixture so that the B6 viscosity value is in the range of 1000 to 1200 mpas when measured using a Brookfield viscometer to obtain resin mixture A.

(2) Take another stainless steel container B, add the solvent, part of the dispersant and aluminum powder pigment in sequence under the stirring state of 300~500r/min. After stirring for 30~45min, add aluminum under the stirring state of 400~600r/min. The powder pigment is wrapped with a protective agent, and after stirring for 30 to 60 minutes, aluminum powder pigment dispersion B is obtained.

(3) Put part of the deionized water into another stainless steel container C, add the remaining dispersant and the remaining defoaming agent under stirring at 400 to 600 r/min, stir for 15 to 30 minutes, add anti-rust pigment, and turn the obtained The mixture is ground at a speed of 2000 to 3000 r/min until the pigment fineness is dispersed to less than 5 μm to obtain anti-rust pigment dispersion C.

(4) Slowly add aluminum powder pigment dispersion B to resin mixture A in stainless steel container A under stirring at 400 to 600 r/min. After complete addition, use part of the pH adjuster to adjust the pH value of the resulting mixture to 8.5 to 8.8. , then stir for 30 minutes at a speed of 400-600r/min, add anti-rust pigment dispersion C, continue stirring at a speed of 400-600r/min for 30 minutes, and use the remaining deionized water to adjust the solid content of the resulting mixture to 15-30 %, use the remaining thickener to adjust the viscosity of the resulting mixture so that the B6 viscosity value is in the range of 1800 to 2200mpas when measured with a Brookfield viscometer, and use the remaining pH adjuster again to adjust the pH value of the resulting mixture to 8.2 to 8.8, that is The water-based color masterbatch composition containing aluminum powder pigment is obtained.

Beneficial effects of the invention

The water-based color masterbatch composition of the aluminum powder pigment provided by the invention significantly improves the blackening and blackening of the aluminum powder pigment in the water-based paint by introducing a composition of stably dispersed aluminum polyphosphate, zinc, calcium, strontium or their modifiers. The problem of gas expansion enables water-based aluminum powder coatings to maintain excellent metallic texture and brightness, and a long-term stable water-based aluminum powder masterbatch is obtained to ensure that the viscosity will not significantly thicken during the use cycle and will not cause problems due to obvious gas expansion. Quality and safety issues meet the common needs of the automotive refinishing industry for water-based environmental protection and excellent appearance.

Detailed ways

In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with specific embodiments. Those skilled in the art should understand that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of the present invention.

The technical solution of the present invention will be described below in conjunction with some more specific embodiments.

Example 1: Aqueous color masterbatch composition 1 containing aluminum powder pigment

Prepare the water-based color masterbatch composition 1 containing aluminum powder pigment according to the formula shown in Table 1 below:

Table 1 Weight parts of raw materials in Example 1

The preparation of the aqueous color masterbatch composition 1 containing aluminum powder pigment includes the following steps:

(1) Put 21.80 parts of homemade acrylic emulsion into stainless steel container A, and add 15.20 parts of deionized water and 18.50 parts of polyurethane resin in sequence while stirring at 400 to 600r/min. U4000, 0.20 parts of 10% dimethylethanolamine aqueous solution, 0.02 parts of defoaming agent BYK028, 0.01 part of wetting agent Wet245, after stirring for 20 to 30 minutes, use 0.80 parts of thickener RHEOLATE299 to adjust the viscosity of the resulting mixture so that it can be used with Brookfield When measured with a viscometer, the B6 viscosity value is in the range of 1000 to 1200mpas, and resin mixture A is obtained.

(2) Take another stainless steel container B, and add 4.20 parts of butanol, 3.80 parts of ethylene glycol butyl ether, 2.00 parts of dispersant BYK190, and 8.60 parts of aluminum silver paste SPARKLE SILVER PREMIER353 under stirring at 300 to 500r/min. After stirring for 30 to 45 minutes, add 2.50 parts of the aluminum powder-coated protective agent Lubrizol 2062 under stirring at 400 to 600 r/min. After stirring for 30 to 60 minutes, aluminum powder dispersion B is obtained.

(3) Put 4.00 parts of deionized water into another stainless steel container C, add 0.20 parts of dispersant Tego755W and 0.02 parts of defoaming agent BYK028 under stirring at 400-600r/min. After stirring for 15-30 minutes, add 1.00 parts For anti-rust pigment Halox 430, grind the obtained mixture at a speed of 2000 to 3000 r/min until the pigment is dispersed to a fineness of less than 5 μm to obtain anti-rust pigment dispersion C.

(4) Slowly add aluminum powder dispersion B to resin composition A in stainless steel container A under stirring at 400 to 600 r/min. After complete addition, use 0.20 parts of 10% dimethylethanolamine aqueous solution to adjust the consistency of the resulting mixture. The pH value reaches 8.5~8.8, then stir for 30 minutes at a speed of 400~600r/min, add anti-rust pigment dispersion C, continue stirring at a speed of 400~600r/min for 30 minutes, and use 16.41 parts of deionized water to adjust the resulting mixture The solid content is adjusted to 23-25%, and 0.34 parts of thickener RHEOLATE299 is used to adjust the viscosity of the resulting mixture so that the B6 viscosity value is in the range of 1800-2200mpas when measured using a Brookfield viscometer, and 0.20 parts of 10% dimethyl is used again. The ethanolamine aqueous solution is used to adjust the pH value of the resulting mixture to 8.2-8.8, thereby obtaining the aqueous color masterbatch composition 1 containing aluminum powder pigment.

Example 2: Water-based color masterbatch composition 2 containing aluminum powder pigment

Prepare the water-based color masterbatch composition 2 containing aluminum powder pigment according to the formula shown in Table 2 below:

Table 2 Weight parts of raw materials in Example 2

The preparation of the aqueous color masterbatch composition 2 containing aluminum powder pigment includes the following steps:

(1) Put 25.80 parts of acrylic emulsion Setaqua6803 into stainless steel container A, and add 11.20 parts of deionized water and 18.50 parts of polyurethane resin in sequence while stirring at 400 to 600r/min. U9800, 0.20 parts of 10% dimethylethanolamine aqueous solution, 0.02 parts of defoaming agent BYK028, 0.01 part of wetting agent Wet245, after stirring for 20 to 30 minutes, use 0.60 parts of thickener ACRYSOLASE-60 to adjust the viscosity of the resulting mixture so that it is When measured using a Brookfield viscometer, the B6 viscosity value is in the range of 1000 to 1200mpas, and resin mixture A is obtained.

(2) Take another stainless steel container B, and add 4.20 parts of butanol, 3.80 parts of ethylene glycol butyl ether, 2.00 parts of dispersant BYK190, and 8.60 parts of aluminum silver paste SPARKLE SILVER PREMIER353 under stirring at 300 to 500r/min. After stirring for 30 to 45 minutes, add 2.50 parts of the aluminum powder-coated protective agent Lubrizol 2062 under stirring at 400 to 600 r/min. After stirring for 30 to 60 minutes, aluminum powder dispersion B is obtained.

(3) Put 4.00 parts of deionized water into another stainless steel container C, add 0.20 parts of dispersant BYK190 and 0.02 parts of defoaming agent BYK028 under stirring at 400-600r/min. After stirring for 15-30 minutes, add 0.80 parts Anti-rust pigment ZP-10, grind the obtained mixture at a speed of 2000 to 3000 r/min until the pigment fineness is dispersed to less than 5 μm to obtain anti-rust pigment dispersion C.

(4) Slowly add aluminum powder dispersion B to resin composition A in stainless steel container A under stirring at 400 to 600 r/min. After complete addition, use 0.20 parts of 10% dimethylethanolamine aqueous solution to adjust the consistency of the resulting mixture. The pH value reaches 8.5~8.8, then stir for 30 minutes at a speed of 400~600r/min, add anti-rust pigment dispersion C, continue stirring at a speed of 400~600r/min for 30 minutes, and use 15.75 parts of deionized water to adjust the resulting mixture The solid content is adjusted to 23-25%, and 1.00 part of thickener ACRYSOLASE-60 is used to adjust the viscosity of the resulting mixture so that the B6 viscosity value is in the range of 1800-2200mpas when measured with a Brookfield viscometer, and 0.60 part of 10 is used again. % dimethylethanolamine aqueous solution to adjust the pH value of the resulting mixture to 8.2-8.8, thereby obtaining the aqueous color masterbatch composition 2 containing aluminum powder pigment.

Examples 3 to 5: Aqueous color masterbatch compositions 3 to 5 containing aluminum powder pigments

Prepare water-based color masterbatch compositions 3 to 5 containing aluminum powder pigments according to the formula shown in Table 3 below:

Table 3 Weight parts of raw materials in Examples 3 to 5

The preparation steps of the aqueous color masterbatch compositions 3 to 5 containing aluminum powder pigments are the same as those in Example 1.

Comparative Example 1: Water-based color masterbatch 1 as a comparative example

The water-based color masterbatch 1 as a comparative example was prepared according to the formula shown in Table 4 below. The difference from Example 1 is that no anti-rust pigment was added.

Table 4 Weight parts of raw materials in Comparative Example 1

The preparation of the aqueous color masterbatch 1 as a comparative example includes the following steps:

(1) Put 21.80 parts of homemade acrylic emulsion into stainless steel container A, and add 15.20 parts of deionized water and 18.50 parts of polyurethane resin in sequence while stirring at 400 to 600r/min. U4000, 0.20 parts of 10% dimethylethanolamine aqueous solution, 0.02 parts of defoaming agent BYK028, 0.01 part of wetting agent Wet245, after stirring for 20 to 30 minutes, use 0.80 parts of thickener RHEOLATE299 to adjust the viscosity of the resulting mixture so that it can be used with Brookfield When measured with a viscometer, the B6 viscosity value is in the range of 1000 to 1200mpas, and resin mixture A is obtained.

(2) Take another stainless steel container B, and add 4.20 parts of butanol, 3.80 parts of ethylene glycol butyl ether, 2.00 parts of dispersant BYK190, and 8.60 parts of aluminum silver paste SPARKLE SILVER PREMIER353 under stirring at 300 to 500r/min. After stirring for 30 to 45 minutes, add 2.50 parts of the aluminum powder-coated protective agent Lubrizol 2062 under stirring at 400 to 600 r/min. After stirring for 30 to 60 minutes, aluminum powder dispersion B is obtained.

(3) Slowly add aluminum powder dispersion B to resin composition A in stainless steel container A under stirring at 400 to 600 r/min. After complete addition, use 0.20 parts of 10% dimethylethanolamine aqueous solution to adjust the consistency of the resulting mixture. Adjust the pH value to 8.5~8.8, then stir for 30 minutes at a speed of 400~600r/min, use 21.60 parts of deionized water to adjust the solid content of the resulting mixture to 22~24%, and use 0.37 parts of thickener RHEOLATE299 to adjust the viscosity of the resulting mixture , so that the B6 viscosity value is in the range of 1800 to 2200mpas when measured using a Brookfield viscometer, and again use 0.20 parts of 10% dimethylethanolamine aqueous solution to adjust the pH value of the resulting mixture to 8.2 to 8.8, which is obtained as a comparative example Water-based aluminum pink masterbatch 1.

It should be noted that in this comparative example, the formula of the water-based color masterbatch 1 does not contain anti-rust pigment dispersion with anti-rust pigment as the main component, and the amount of anti-rust pigment is 0, which is less than what is required in the claims. The lower dosage limit of 0.01 part is not within the scope of the present invention, so this example is only Comparative Example 1. The lack of anti-rust pigments will cause the stability of the aluminum powder pigments in the system to decrease, aggravate the reaction with the water in the system, causing the aluminum powder pigments to gradually turn black and lose their metallic texture. The color difference between the color masterbatch before and after storage is large, and the amount of gas is relatively large. high.

Detection methods for the products obtained in the examples and comparative examples

Project 1: Color Stability

Each aqueous color masterbatch prepared in Examples 1 to 5 and Comparative Example 1 was placed in a 50°C thermostatic box. After standing for 2 months, the color changes of the color masterbatch before and after storage were compared. The color comparison method is as follows:

Mix the stored water-based color masterbatch and the water-based color masterbatch stored at room temperature for 2 months with the water-based repair paint black masterbatch at a ratio of 1:1 respectively. Use a 150um wet film preparer to scrape the cardboard and dry it at low temperature. Color difference measurement and comparison, observe the change of color (taking a 45° angle), where the color difference ⊿E uses the CIELAB color difference formula to calculate the total color difference (reference GB11186.3-89).

Item 2: Gas generation

Take 250ml each of the aqueous color masterbatch prepared in Examples 1 to 5 and Comparative Example 1, and place them in a gas-generating device respectively. Place the gas-generating device in a 50°C water bath, and let it stand at a constant temperature for 30 minutes. After the temperature is constant, proceed Seal and continue to be kept in a constant temperature water bath at 50°C for 10 days. The amount of gas generated is measured by the drainage method (that is, the amount of displaced water is used to represent the amount of hydrogen generated by the reaction between the aqueous color masterbatch and the aluminum powder and water).

The test results of items 1 to 2 of the products obtained in Examples 1 to 5 and Comparative Example 1 are shown in Table 5 below.

Table 5 Test results for items 1 to 2 of the products obtained in Examples 1 to 5 and Comparative Example 1

It can be seen from the test results in Table 5 that in terms of color stability, the color difference between the aqueous masterbatch prepared in Examples 1 to 5 after being stored in a 50°C thermostat for 2 months and the product before storage is small. In terms of gas generation, the amount of gas generated by the aqueous masterbatch produced in Examples 1 to 5 was small after being subjected to a constant temperature water bath at 50°C for 10 days. It can be seen that Examples 1 to 5 can maintain the excellent metallic texture and brightness of the water-based aluminum powder coating, and obtain a long-term stable water-based aluminum powder masterbatch, ensuring that the viscosity will not significantly thicken during the use cycle, and will not be significantly increased due to obvious increase in the viscosity. Quality and safety issues arising from gas.

After the water-based color masterbatch prepared in Comparative Example 1 was stored in a 50°C thermostat for 2 months, the color difference from the product before storage was large (⊿E was 2.65). In terms of gas generation, the aqueous color masterbatch prepared in Comparative Example 1 produced a large amount of gas after being subjected to a constant temperature water bath at 50°C for 10 days (gas generation ml/kg was 119). This result shows that the lack of anti-rust pigments will lead to a decrease in the stability of the aluminum powder pigment in the system, aggravate the reaction with water in the system, causing the aluminum powder pigment to gradually turn black and lose its metallic texture, and the color difference of the color masterbatch before and after storage is large. , the gas production volume is higher.

Obviously, the above-mentioned embodiments of the present invention are only examples to clearly illustrate the present invention, and are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, based on the above description, they can also make It is not possible to exhaustively enumerate all other variations or modifications in different forms. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims (10)

1. An aqueous color master composition containing aluminum powder pigment comprises the following components in parts by weight:

the total weight of the above components is 100 parts.

2. The aqueous color masterbatch composition containing aluminum powder pigment according to claim 1, characterized in that the mixed resin comprises, in parts by weight:

5-25 parts of physical curing or self-crosslinking polymer

5-25 parts of water-dispersible resin

The total weight of the components is 10-50 parts.

3. The aqueous masterbatch composition containing aluminum powder pigments of claim 2 wherein said physically cured or self-crosslinking polymer is selected from one or a combination of physically cured polyurethane dispersions or self-crosslinking polyurethanes; the water-dispersible resin is selected from one or more of water-dispersible acrylic emulsion, aqueous polyurethane dispersion, aqueous polyester resin, aqueous epoxy resin, acrylic modified polyurethane dispersion, polyester modified polyurethane dispersion, epoxy modified acrylic emulsion or polyester modified acrylic.

4. The aqueous color masterbatch composition containing aluminum powder pigment according to claim 1 characterized in that the particle size of the aluminum powder pigment is 5-50 μm.

5. The aqueous color masterbatch composition containing aluminum powder pigment of claim 1 wherein the aluminum powder pigment package protectant is an epoxy or a block copolymer of acrylic and phosphate; preferably, the aluminum powder pigment package protective agent is used in an amount of 20-60% of the aluminum powder pigment content in percentage by weight; more preferably, the aluminum powder pigment package protective agent is used in an amount of 30-50% of the aluminum powder pigment content in terms of weight percent.

6. The aqueous color masterbatch composition containing aluminum powder pigment according to claim 1, characterized in that the rust inhibitive pigment is selected from one or more of aluminum polyphosphate, zinc, calcium, strontium and their modifiers and aluminum orthophosphate, zinc, calcium, strontium and their modifiers.

7. The aqueous color masterbatch composition containing aluminum powder pigment according to claim 1, characterized in that the auxiliary agent comprises, in parts by weight:

the total weight of the components is 1-12 parts. Preferably, the dispersant is used in an amount of 1-40% of the pigment content of the aluminum powder in weight percent; more preferably, the dispersant is used in an amount of 15 to 20% of the pigment content of the aluminum powder in weight percent.

8. The aqueous color masterbatch composition containing aluminum powder pigment of claim 7 wherein said thickener is selected from one or more of polyurethane associated acrylic emulsion, alkali-swellable acrylic emulsion, hydrophobically modified alkali-swellable acrylic emulsion, polyamide wax, modified ethylene-vinyl acetate copolymer wax emulsion, fumed silica, and layered silicate.

9. The aqueous color masterbatch composition containing aluminum powder pigment according to claim 1, characterized in that the solvent is one or more solvents selected from the group consisting of alcohols, ethers, ketones; preferably, the solvent is selected from one or more of ethanol, n-propanol, isopropanol, butanol, n-pentanol, n-hexanol, isooctanol, propylene glycol methyl ether, propylene glycol butyl ether, diacetone alcohol, ethylene glycol butyl ether, ethylene glycol isooctyl ether, diethylene glycol methyl ether and dipropylene glycol methyl ether.

10. A method of preparing the aqueous color master composition containing aluminum powder pigment as defined in claim 7, comprising the steps of:

(1) Adding the mixed resin into a stainless steel container A, sequentially adding part of deionized water, part of pH regulator, part of defoamer and wetting agent in a stirring state of 400-600 r/min, stirring for 20-30 min, and adjusting the viscosity of the obtained mixture by using part of thickener to ensure that the viscosity value of B6 is in the range of 1000-1200 mpas when measured by using a Brookfield viscometer, thereby obtaining a resin mixture A;

(2) Taking another stainless steel container B, sequentially adding a solvent, a part of dispersing agent and aluminum powder pigment in a stirring state of 300-500 r/min, stirring for 30-45 min, adding an aluminum powder pigment coating protective agent in a stirring state of 400-600 r/min, and stirring for 30-60 min to obtain an aluminum powder pigment dispersion liquid B;

(3) Adding part of deionized water into another stainless steel container C, adding the rest dispersant and the rest defoamer in a stirring state of 400-600 r/min, stirring for 15-30 min, adding the anti-rust pigment, and grinding the obtained mixture at a speed of 2000-3000 r/min until the pigment fineness is dispersed below 5 mu m to obtain an anti-rust pigment dispersion liquid C;

(4) Slowly adding the aluminum powder pigment dispersion liquid B into the resin mixture A in the stainless steel container A under the stirring state of 400-600 r/min, regulating the pH value of the obtained mixture to 8.5-8.8 by using a part of pH regulator after the mixture is completely added, then stirring for 30min at the speed of 400-600 r/min, adding the antirust pigment dispersion liquid C, continuously stirring for 30min at the speed of 400-600 r/min, regulating the solid content of the obtained mixture to 15-30% by using the residual deionized water, regulating the viscosity of the obtained mixture by using the residual thickener, regulating the viscosity of the obtained mixture to the range of 1800-2200 mpas when the mixture is measured by using a Brookfield viscometer, and regulating the pH value of the obtained mixture to 8.2-8.8 by using the residual pH regulator again to obtain the aqueous color master batch composition containing the aluminum powder pigment.