CN115627104A

CN115627104A - High-covering-power double-component water-based white paint and preparation method thereof

Info

Publication number: CN115627104A
Application number: CN202211387082.0A
Authority: CN
Inventors: 汤汉良; 郭逍遥; 左盼盼; 许松江; 雷斯敏; 刘凯; 郭伟杰; 赖浩城
Original assignee: Qingyuan Huawan Materials Research Institute Co ltd
Current assignee: Qingyuan Huawan Materials Research Institute Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-01-20

Abstract

The invention belongs to the technical field of automobile coatings, and discloses a high-covering-power two-component water-based white paint which comprises the following components in parts by weight: the component A comprises: the paint comprises a water-based hydroxyl acrylic acid dispersion, titanium dioxide, a wetting dispersant 750W, pH regulator, a thickening agent, a surfactant, a defoaming agent, deionized water and a component B: a curing agent solution; the surfactant is a combination of a gemini nonionic surfactant 104E and an organosilicon surfactant BYK-346; the ratio of the gemini nonionic surfactant 104E to the organosilicon surfactant BYK-346 is 1:2 to 4. The two-component water-based white paint provided by the invention has a resin-free grinding system, and the water-based white paint obtained by combining the specific gemini nonionic surfactant and the organic silicon surfactant has the advantages of good covering power, good whiteness, good storage stability, high glossiness, excellent adhesion and excellent hardness.

Description

High-covering-power double-component water-based white paint and preparation method thereof

Technical Field

The invention belongs to the technical field of automobile coatings, and particularly relates to a high-covering-power two-component water-based white paint and a preparation method thereof.

Background

The rapid development of economy and the proliferation of the automotive industry have made automobiles a popular vehicle for people. The automobile industry has a great demand on automobile coatings, and the automobile coatings are required to have unique coating performance and construction performance besides high requirements on the variety and conventional performance of the coatings, so the automobile coatings become special coatings.

At present, the automobile coating is mainly solvent-based, and a large number of Volatile Organic Compounds (VOCs) cause serious pollution to the ecological environment in the coating process and bring great harm to human health. With the enforcement of environmental protection regulations, the development of water-based automotive coatings has become the mainstream direction.

Patent CN 112126330A discloses a water-based white paint and a preparation method thereof, wherein the water-based white paint comprises a component A and a component B, and the component A comprises the following components: 30-70 wt% of water-based ultraviolet curing resin; 0.1-5 wt% of a surface layer photocuring initiator; 1-26% by weight of titanium dioxide; optionally an aqueous polymer dispersion; and optionally an auxiliary agent; the B component comprises an aliphatic polyisocyanate and an optional solvent, wherein the amount of the aliphatic polyisocyanate is 5-15 wt%. The water-based white paint contains aliphatic polyisocyanate and little or no deep light curing initiator, and a coating formed by curing is not easy to yellow. And the water-based white paint of the invention has equivalent or better mechanical properties compared with the traditional water-based white paint. However, the titanium dioxide directly adopted has poor dispersibility, so that the product stability and the covering performance are poor.

Patent CN 105860806A discloses an aqueous single-component white paint with excellent comprehensive performance for automobiles and a preparation method thereof. The water-based single-component white paint consists of resin, an amine neutralizer, white slurry and an auxiliary agent, wherein the white slurry consists of deionized water, a cosolvent, the auxiliary agent and titanium dioxide. After the materials are fed according to the formula of the white slurry, dispersing at a high speed for 10-15min, then grinding the materials in a sand mill until the fineness is less than 5 mu m to obtain the white slurry, then sequentially feeding the materials according to the formula of the white paint, and uniformly stirring to obtain the water-based white paint. In order to solve the problem of dispersibility of titanium dioxide, a specific organic montmorillonite anti-settling agent is required to be adopted, so that white slurry and white paint with high specific gravity do not settle and do not separate water in the storage process; and adding an anionic high molecular weight dispersant to help the anti-settling agent to be stable in the system.

Disclosure of Invention

Aiming at the defects and shortcomings of the prior art, the invention aims to provide the high-covering-power two-component water-based white paint.

The invention also aims to provide a preparation method of the high-hiding-power two-component water-based white paint.

The purpose of the invention is realized by the following technical scheme:

the high-covering power two-component water-based white paint comprises the following components in parts by weight:

and (2) component A:

and the component B comprises:

10-40 parts of a curing agent solution;

the surfactant is a combination of a gemini nonionic surfactant 104E and an organosilicon surfactant BYK-346; the ratio of the gemini nonionic surfactant 104E to the organosilicon surfactant BYK-346 is 1:2 to 4.

The gemini nonionic surfactant 104E can be replaced by 104BC, 104H and other brands, and the main active ingredient of the gemini nonionic surfactant is 104.

Further, as the optimization of the invention, 595 titanium dioxide is selected as titanium dioxide; according to the relevant information records provided by the supplier:

TIONA595 is a superior TIO ₂ Pigment products that give excellent performance in a number of high performance coating systems, TIONA595 particle size optimization maximizes light scattering properties and gives better performance in hiding power and tinting strength. Therefore, the inherent covering power of the 595 titanium dioxide has the advantage that the titanium dioxide has better effect with half the effort.

It should be noted that: the gemini nonionic surfactant 104E and the organosilicon surfactant BYK-346 are a set of optimized combination matched with 595 titanium dioxide; meanwhile, the gemini nonionic surfactant 104E and the organosilicon surfactant BYK-346 can improve the dispersion effect of the wetting dispersant 750W.

Gemini nonionic surfactant 104E is widely used as an antifoaming agent, according to the relevant information of the supplier: SURFYNOL 104E is a diyne diol surfactant, which is formulated by 50% SURFYNOL 104 and 50% ethylene glycol, and is a gemini nonionic surfactant. It has the functions of moistening, leveling, defoaming, etc.

The silicone surfactant BYK-346 primarily functions to wet the substrate.

In the field of coatings, a large number of patents mention the use of the defoaming agent, for example, the specification of CN202111567084.3 explicitly describes that 104E is added into red paste and white paste as the defoaming agent, and a dispersing agent TEGO 757W and a dispersing agent BYK-190 are matched; it is clear that the amount used is very limited when used as a defoamer.

In the scheme, 104E is mainly used as a leveling agent, and the leveling effect of 104E is better in the presence of BYK-346.

The wetting dispersant 750W is found in the use process, if the dosage is too small, the titanium dioxide can not be dispersed, and the storage stability is influenced; too much wetting dispersant is used, resulting in a decrease in hiding power.

The dispersion effect of 750W can be further improved by selecting the table activity combination of BYK-346 and 104E; under the condition of relatively less using amount of 750W, excellent titanium dioxide dispersion effect is kept, excellent covering power is maintained, and finally dual guarantee of storage stability and covering power is achieved.

Further, the addition amount of the wetting dispersant is 8-12% of the mass of the titanium dioxide.

Further, the pH regulator employs a multifunctional amine auxiliary agent such as AMP-95 (2-amino-2-methyl-1-propanol). Compared with ammonia water, the multifunctional amine assistant has smaller taste, and compared with other amine assistant neutralizers, the multifunctional amine assistant has better dispersity of an acid value system and no particle.

Further, the thickener is nonionic polyurethane thickener, such as polyurethane 0620 thickener and polyurethane 0630 thickener. The polyurethane 0620 thickening agent has high thickening speed and takes effect within 1 minute; the thickening speed of the polyurethane 0630 thickening agent is low, the thickening speed is about 5 minutes, so that the using amount is increased by 3-5 times, but the storage stability is better, and other functional effects are similar; if the 0620 and 0630 are combined, the thickening speed is relatively moderate, and the processing speed is suitable.

Further, the curing agent solution is an isocyanate curing agent solution, such as bayer 3390 or 2650.

The preparation method of the high-covering-power two-component water-based white paint comprises the following preparation steps:

(1) Adding a part of surfactant into deionized water, stirring and dissolving uniformly to obtain a surfactant solution;

(2) Uniformly stirring and mixing titanium dioxide and a wetting dispersant, adding the mixture into the surfactant solution obtained in the step (1), and grinding and uniformly mixing to obtain slurry;

(3) Under the condition of stirring, uniformly stirring and mixing the slurry obtained in the step (2) with a pH regulator, the other part of surfactant, a defoaming agent, an aqueous hydroxy acrylic acid dispersoid and a thickening agent to obtain a component A;

(4) And (3) subpackaging the component A and the component B of the curing agent solution according to a ratio to obtain the high-covering-power two-component water-based white paint.

Further, the surfactant in the step (3) is an organosilicon surfactant BYK-346.

Compared with the prior art, the invention has the beneficial effects that:

the two-component water-based white paint provided by the invention has a resin-free grinding system, and the water-based white paint has the advantages of good covering power, good whiteness, good storage stability, high glossiness, excellent adhesion and excellent hardness by combining the specific gemini nonionic surfactant and the organic silicon surfactant and matching with the wetting dispersant.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

Example 1

The high-hiding power two-component water-based white paint is prepared by the following steps:

(1) According to the weight portion, 0.3 portion of Gemini non-ionic surfactant 104E and 0.1 portion of organosilicon surfactant BYK-346 are added into deionized water to be stirred and dissolved uniformly, and surfactant solution is obtained.

(2) And (2) uniformly stirring and mixing 40 parts of 595 titanium dioxide and 4 parts of 750W wetting dispersant, adding the mixture into the surfactant solution obtained in the step (1), and grinding and uniformly mixing to obtain slurry.

(3) Stirring and uniformly mixing the slurry obtained in the step (2) with 2 parts of a pH regulator (10% AMP-95 solution) to adjust the pH value of a system to be neutral, and then adding 0.05 part of a silicone surfactant BYK-346, 0.05 part of a silicone defoaming agent 024, 50 parts of a water-based hydroxyl acrylic acid dispersion 2470 and 1 part of a non-ionic polyurethane thickening agent (66 percent to 0620 solution) to stir and mix uniformly to obtain a component A;

(4) And (3) using the component A and a curing agent solution component B (Bayer 3390, 30% solid content) according to the weight ratio of 4:1 to obtain the high-covering-power two-component water-based white paint.

Example 2

(1) According to the weight portion, 0.2 portion of Gemini non-ionic surfactant 104E and 0.2 portion of organosilicon surfactant BYK-346 are added into deionized water to be stirred and dissolved evenly, and surfactant solution is obtained.

(2) And (2) uniformly stirring and mixing 30 parts of 595 titanium dioxide and 3 parts of 750W wetting dispersant, adding the mixture into the surfactant solution obtained in the step (1), and grinding and uniformly mixing to obtain slurry.

(3) Stirring and uniformly mixing the slurry obtained in the step (2) with 2 parts of a pH regulator (10% AMP-95 solution) to adjust the pH value of a system to be neutral, and then adding 0.05 part of a silicone surfactant BYK-346, 0.05 part of a silicone defoaming agent 024, 55 parts of a water-based hydroxy acrylic acid dispersion 2470 and 1 part of a non-ionic polyurethane thickener (66-0620 solution) to stir and mix uniformly to obtain a component A;

Example 3

(2) And (2) stirring and uniformly mixing 32 parts of 595 titanium dioxide and 5 parts of 750W wetting dispersant, adding the mixture into the surfactant solution obtained in the step (1), and grinding and uniformly mixing to obtain slurry.

(3) Stirring and uniformly mixing the slurry obtained in the step (2) with 2 parts of a pH regulator (10% AMP-95 solution) to adjust the pH value of a system to be neutral, and then adding 0.05 part of a silicone surfactant BYK-346, 0.05 part of a silicone defoaming agent 024, 45 parts of a water-based hydroxyl acrylic acid dispersion 2470 and 1 part of a non-ionic polyurethane thickening agent (66 percent to 0620 solution) to stir and mix uniformly to obtain a component A;

Example 4

The same as example 3, except that: 0.27 part of Gemini nonionic surfactant 104E and 0.13 part of silicone surfactant BYK-346.

Example 5

The same as example 3, except that: the content of the Gemini nonionic surfactant 104E is 0.32 part, and the content of the silicone surfactant BYK-346 is 0.08 part.

Example 6

The same as example 3, except that: the defoaming agent is selected to be RW-024, and the addition amount is 0.1 part.

Example 7

The same as example 3, except that: the nonionic polyurethane thickener consists of 0620 and 0630 brands of polyurethane thickeners, and 1.2 parts of 0620 polyurethane thickener; 0630 parts of polyurethane thickener.

In experiments, the polyurethane thickeners 0620 and 0630 have advantages respectively, and the polyurethane thickener 0620 takes effect after thickening for 1 minute, but has inferior storage stability compared with other polyurethane thickeners; the polyurethane thickener 0630 has poor thickening effect, and the dosage of the polyurethane thickener is increased by 3 to 5 times and the thickening speed is about 5 minutes to achieve the thickening effect similar to that of 0620.

In this example, through the combination of 0620 and 0630, the system stability is enhanced, although the total amount of polyurethane thickener is increased.

Comparative example 1

Compared with the example 3, the surfactant in the step (1) adopts 0.4 part of the gemini nonionic surfactant 104E, and the rest steps are completely the same.

Comparative example 2

In this comparative example, compared with example 3, the surfactant used in step (1) was 0.4 part of silicone surfactant BYK-346, and the rest of the procedure was identical.

Comparative example 3

This comparative example is different from example 3 in that: the gemini nonionic surfactant 104E is replaced by Surfynol 485;

the Surfynol 485 adds epoxy group on the basis of Surfynol 104.

Comparative example 4

This comparative example is different from example 3 in that: the wetting dispersant was chosen to be HLD-8/KS.

Performance test

The water-based white paints obtained in the above examples and comparative examples were tested for adhesion (GB/T9286-1998), hiding power (GB/T1726-1979), storage stability (GB/T6753.3-1986) (50 ℃ C. 7 d), impact resistance (GB/T1732-2020), pencil hardness (GB/T1730-1993), and gloss (GB/T1743-1989), and the results are shown in Table 1 below.

TABLE 1 test results

As can be seen from the results in Table 1, the water-based white paint prepared by adopting the compounding combination of the specific gemini nonionic surfactant and the organosilicon surfactant has the advantages of good covering power, good storage stability and high adhesive force.

Specifically, the method comprises the following steps:

1. the comparison of example 3 with comparative examples 1 and 2 shows that: 104E, BYK-346 have the defects of one and the other, and have certain help on hiding power, storage stability and hardness;

2. it can be found by comparing example 3 with comparative example 3 that the formulation of the non-modified gemini nonionic surfactant and BYK-346 is superior to the formulation of the modified gemini nonionic surfactant and BYK-346 in storage stability and hardness.

3. It can be seen by comparison of example 3 with comparative example 4 that the choice of wetting dispersant is critical, which determines the hiding power, hardness and storage stability of the paint film.

4. It can be seen by comparison of example 1 with comparative examples 1-4 that reducing the amount of wetting dispersant 750W is critical to overall effect such as stability, requiring a formulation of 104E, BYK-346.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. The high-covering-power two-component water-based white paint is characterized by comprising the following components in parts by weight:

the component A comprises:

and B component:

10-40 parts of a curing agent solution;

2. The two-component water-based white paint with high hiding power as claimed in claim 1, wherein the addition amount of the wetting dispersant is 8-12% of the mass of the titanium dioxide.

3. The high hiding power two-component water-based white paint as claimed in claim 1, wherein said pH adjusting agent is a multifunctional amine adjuvant.

4. The high hiding power two-component water-based white paint of claim 1 wherein the thickener is a non-ionic polyurethane thickener.

5. The high hiding power two-component water-based white paint as claimed in claim 1, wherein said curing agent solution is an isocyanate curing agent solution.

6. The method for preparing the high hiding power two-component water-based white paint as claimed in any one of claims 1 to 5, comprising the steps of:

(3) Stirring and mixing the slurry obtained in the step (2) with a pH regulator, the other part of surfactant, a defoaming agent, an aqueous hydroxyl acrylic acid dispersoid and a thickening agent uniformly under a stirring condition to obtain a component A;

7. The method for preparing the two-component water-based white paint with high hiding power as claimed in claim 6, wherein the surfactant in the step (3) is a silicone surfactant BYK-346.