Easy-to-construct water-based two-component glazed varnish and preparation method thereof

Abstract

The invention relates to an easy-to-construct water-based two-component glazed varnish and a preparation method thereof, and relates to the technical field of paints.The easy-to-construct water-based two-component glazed varnish is prepared from a component A, a component B, a component C and a component D, the component B is a water dispersible isocyanate curing agent. According to the method, the surfactant and the defoaming agent are sequentially and rapidly added at the tail section, and the dosage of the surfactant and the dosage of the defoaming agent are limited, so that the possibility that the defoaming agent is damaged can be greatly reduced, the problems of oil shrinkage and more bubbles during varnish construction are avoided, and the defects in the prior art are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly to an easily constructible waterborne two-component glaze varnish and a preparation method thereof. Background Art

[0002] In recent years, with the continuous improvement of people's requirements for building aesthetics and the quality of living environment, waterborne two-component glaze varnish, as a high-end architectural coating that combines high hardness, excellent stain resistance, outstanding decorative effects and strong protection performance, has seen a continuous increase in market demand. However, in the actual application and construction process, especially when performing roller coating operations on flat and smooth substrates, the technical bottlenecks exposed by this type of coating have become increasingly prominent, seriously restricting its wider application and promotion.

[0003] Specifically, oil shrinkage is one of the common problems in the roller coating construction of waterborne two-component glaze varnish. Due to the uneven shrinkage of the coating during the drying process, defects such as wavy, sunken or raised surfaces appear on the coating surface, seriously affecting the flatness and aesthetics of the coating. In addition, the generation of bubbles is another major problem. During the roller coating process, the tiny bubbles in the coating are difficult to effectively remove and solidify inside the coating as the coating dries, forming visible bubble points, further reducing the quality and service life of the coating.

[0004] More critically, these construction problems not only affect the final effect of the coating, but also greatly increase the construction difficulty and time cost. For construction workers, they need to repeatedly adjust construction techniques, control the construction environment, and even perform multiple reworks to barely achieve the expected construction effect. This not only reduces construction efficiency, but also increases material waste and labor costs, seriously restricting the market competitiveness of waterborne two-component glaze varnish.

[0005] Therefore, developing a new type of coating product that can easily achieve roller coating construction on flat and smooth substrates, effectively avoid oil shrinkage and bubble problems, and maintain the original excellent performance of waterborne two-component glaze varnish is of great significance for meeting market demand, improving construction efficiency, reducing construction costs, and promoting the technological progress of the architectural coating industry. Summary of the Invention

[0006] To solve the above problems, the present invention provides an easily constructible waterborne two-component glaze varnish and a preparation method thereof.

[0007] In a first aspect, the present invention provides an easily constructible waterborne two-component glaze varnish, and the easily constructible waterborne two-component glaze varnish comprises the following components:

[0008] Component A: hydroxyl-containing acrylic emulsion, surfactant, defoamer, water and other additives;

[0009] Component B: Water-dispersible isocyanate curing agent;

[0010] Among them, the surfactant and the defoamer are quickly added once at the final stage of paint preparation;

[0011] The weight percentage of the surfactant in the easy-to-construct waterborne two-component enamel varnish ≥ 0.2% and ≤ 0.5%;

[0012] The weight percentage of the defoamer in the easy-to-construct waterborne two-component enamel varnish ≥ 0.2% and ≤ 0.4%;

[0013] The construction weight ratio of Component A to Component B is 100:(15 - 20).

[0014] Furthermore, by weight parts, the easy-to-construct waterborne two-component enamel varnish comprises the following components:

[0015] Hydroxyl-containing acrylic emulsion 40 - 70 parts, surfactant 0.2 - 0.5 parts, defoamer 0.2 - 0.4 parts, water 20 - 40 parts, and other additives 2.2 - 7.5 parts.

[0016] Furthermore, the HLB value of the surfactant ≤ 6.

[0017] Furthermore, the other additives include one or more of a film-forming aid, a preservative, a thickener, an anti-graffiti aid, and a mildew-proof agent.

[0018] Furthermore, the surfactant is at least one of a polyether polyol and an alkoxylated fatty alcohol polymer.

[0019] Furthermore, the defoamer is a mineral oil-based defoamer.

[0020] In a second aspect, the present invention provides a preparation method for the easy-to-construct waterborne two-component enamel varnish according to any one of the first aspect, and the preparation method comprises the following steps:

[0021] Add water and the hydroxyl-containing acrylic emulsion to a dispersion container and stir evenly to obtain a first mixture;

[0022] Add the other additives to the first mixture and stir evenly to obtain a second mixture;

[0023] Add the surfactant and the defoamer to the second mixture and stir evenly to obtain the easy-to-construct waterborne two-component enamel varnish.

[0024] The above technical solutions provided by the embodiments of the present invention have at least the following advantages compared with the prior art:

[0025] An embodiment of the present invention provides an easily constructible waterborne two-component enamel varnish. Conventional two-component enamel varnishes generally can only be applied by spraying or brushing. When using the roller coating construction method, various film defects will occur, such as oil shrinkage problems or bubble problems. The occurrence of oil shrinkage problems and bubble problems is mainly affected by surfactants and defoamers. When too little surfactant is added, insufficient wetting of the substrate will cause oil shrinkage problems. When too much surfactant is added, excessive hydrophilic and lipophilic groups will make the bubbles more stable, resulting in bubble problems. When too little defoamer is added, poor defoaming ability will occur, resulting in defoaming problems. When too much defoamer is added, due to poor compatibility with the system, oil shrinkage problems will occur. In addition, during the formulation design, the following often occurs: when defoaming is not good, adding additional defoamer can solve the defoaming problem, but it will cause oil shrinkage problems. When oil shrinkage occurs, adding additional surfactant can solve the oil shrinkage problem, but it will cause bubble problems. The above phenomena are extremely obvious in two-component enamel varnishes and are very difficult to solve. The present invention can greatly reduce the possibility of defoamer being damaged by quickly adding surfactants and defoamers in sequence at the end stage, and by limiting the amounts of surfactants and defoamers, so that neither oil shrinkage nor excessive bubbles occur during the construction of the varnish, making up for the deficiencies of the prior art. Detailed implementation mode

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Unless otherwise specifically stated, all kinds of raw materials, reagents, instruments, and equipment used in the present invention can be obtained through market purchases or can be prepared by existing methods.

[0028] In a first aspect, the present invention provides an easily constructible waterborne two-component enamel varnish, and the easily constructible waterborne two-component enamel varnish comprises the following components:

[0029] Component A: Hydroxyl-containing acrylic emulsion, surfactant, defoamer, water, and other additives;

[0030] Component B: Water-dispersible isocyanate curing agent;

[0031] Wherein, the surfactant and the defoamer are quickly added at one time in the final stage of paint preparation;

[0032] The weight percentage of the surfactant in the easy-to-construct waterborne two-component glaze varnish ≥ 0.2% and ≤ 0.5%;

[0033] The weight percentage of the defoamer in the easy-to-construct waterborne two-component glaze varnish ≥ 0.2% and ≤ 0.4%;

[0034] The construction weight ratio of the component A to the component B is 100:(15 - 20).

[0035] The present invention provides for the first time an easy-to-construct waterborne two-component glaze varnish. Conventional two-component glaze varnishes generally can only be constructed by spraying or brushing. When using the roller coating construction method, various film defects will occur, such as oil shrinkage problems or bubble problems. The occurrence of oil shrinkage problems and bubble problems is mainly affected by surfactants and defoamers. When too little surfactant is added, insufficient wetting of the substrate will cause oil shrinkage problems. When too much surfactant is added, excessive hydrophilic and lipophilic groups will make the bubbles more stable, resulting in bubble problems. When too little defoamer is added, poor defoaming ability will cause defoaming problems. When too much defoamer is added, due to poor compatibility with the system, oil shrinkage problems will occur. In addition, during the formulation design, the following often occurs: when the defoaming is not good, adding additional defoamer can solve the defoaming problem, but it will cause oil shrinkage problems. When oil shrinkage occurs, adding additional surfactant can solve the oil shrinkage problem, but it will cause bubble problems. The above phenomena are extremely obvious in two-component glaze varnishes and are very difficult to solve. The present invention can greatly reduce the possibility of the defoamer being destroyed by adding the surfactant and the defoamer sequentially and rapidly at the end, and by limiting the amounts of the surfactant and the defoamer, so that when the varnish is constructed, neither oil shrinkage nor excessive bubbles will occur, making up for the deficiencies of the prior art.

[0036] In some specific embodiments, by weight, the easy-to-construct waterborne two-component glaze varnish comprises the following components:

[0037] Hydroxyl-containing acrylic emulsion 40 - 70 parts, surfactant 0.2 - 0.5 parts, defoamer 0.2 - 0.4 parts, water 20 - 40 parts, and other additives 2.2 - 7.5 parts.

[0038] In some specific embodiments, the HLB value of the surfactant ≤ 6.

[0039] In some specific embodiments, the other additives include one or more of a film-forming aid, a preservative, a thickener, an anti-graffiti aid, and a mildew-proof agent.

[0040] In some specific embodiments, the surfactant is at least one of a polyether polyol and a fatty alcohol alkoxylate polymer.

[0041] In some specific embodiments, the defoaming agent is a mineral oil-based defoaming agent.

[0042] Second, the present invention provides a method for preparing the easy-to-construct waterborne two-component enamel varnish according to any one of the first aspects. The preparation method includes the following steps:

[0043] Add water and a hydroxyl-containing acrylic emulsion to a dispersion container and stir evenly to obtain a first mixture;

[0044] Add other additives to the first mixture and stir evenly to obtain a second mixture;

[0045] Add a surfactant and a defoaming agent to the second mixture and stir evenly to obtain Component A;

[0046] Stir and mix Component A and Component B to obtain the easy-to-construct waterborne two-component enamel varnish.

[0047] For the raw materials involved in the easy-to-construct waterborne two-component enamel varnish and its preparation method provided by the embodiments of the present invention, if there is no special limitation or description, commercially available products can be directly used or self-made according to the existing public preparation methods; at the same time, for the operation steps involved in the preparation method of the easy-to-construct waterborne two-component enamel varnish, if there is no special limitation or description, they can be carried out according to the conventional preparation methods of existing coatings in the art or using existing equipment, which will not be elaborated one by one here.

[0048] The following combines specific embodiments to further illustrate the present invention. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The experimental methods without specific conditions noted in the following embodiments are usually determined according to national standards. If there is no corresponding national standard, they are carried out according to general international standards, conventional conditions, or conditions recommended by the manufacturer.

[0049] Example 1

[0050] This example provides an easy-to-construct waterborne two-component enamel varnish, including the following components in parts by weight:

[0051] Component A: 60 parts of hydroxyl-containing acrylic emulsion, 0.4 part of surfactant, 0.2 part of defoaming agent, 35.5 parts of water, 3.9 parts of other additives (1.5 parts of thickener, 2 parts of film-forming aid, 0.2 part of preservative, 0.2 part of mildew inhibitor);

[0052] Component B: Water-dispersible isocyanate curing agent;

[0053] The construction weight ratio of Component A and Component B is 100:20;

[0054] The hydroxyl-containing acrylic emulsion is Wanhua Archsol 8573 emulsion;

[0055] The surfactant is RP0244 with an HLB value of 6;

[0056] The defoamer is F-210;

[0057] The thickener is Gaotai XS-71;

[0058] The film-forming aid is lauryl ester;

[0059] The preservative is MBS5050;

[0060] The mildew-proof agent is Troy 7026;

[0061] The water-dispersible isocyanate curing agent is Wanhua Chemical Aquolin 268.

[0062] The preparation method of the above-mentioned easy-to-construct waterborne two-component enamel varnish comprises the following steps:

[0063] Add water and the hydroxyl-containing acrylic emulsion into a dispersion container and stir evenly to obtain a first mixture;

[0064] Add other additives to the first mixture and stir evenly to obtain a second mixture;

[0065] Add the surfactant and the defoamer to the second mixture and stir evenly to obtain Component A;

[0066] Stir and mix Component A and Component B to obtain the easy-to-construct waterborne two-component enamel varnish.

[0067] Example 2

[0068] This example provides an easy-to-construct waterborne two-component enamel varnish and its preparation method. The difference from Example 1 is only that the dosage of each raw material in Component A of the easy-to-construct waterborne two-component enamel varnish is adjusted to: 55 parts of hydroxyl-containing acrylic emulsion, 0.4 part of surfactant, 0.3 part of defoamer, 40.6 parts of water and 3.7 parts of other additives (1.5 parts of thickener, 1.8 parts of film-forming aid, 0.2 part of preservative, 0.2 part of mildew-proof agent); the remaining steps and parameters are the same.

[0069] Example 3

[0070] This example provides an easy-to-construct waterborne two-component glaze varnish and its preparation method. The difference from Example 1 is only that: the dosage of each raw material in Component A of the easy-to-construct waterborne two-component glaze varnish is adjusted to: 62 parts of hydroxyl-containing acrylic emulsion, 0.4 part of surfactant, 0.3 part of defoamer, 33.2 parts of water, and 4.1 parts of other additives (1.5 parts of thickener, 2.2 parts of film-forming aid, 0.2 part of preservative, 0.2 part of mildew-proof agent); the remaining steps and parameters are the same.

[0071] Comparative Example 1

[0072] The difference between this example and Example 1 is only that: the addition order of the surfactant and the defoamer is changed. Specifically, the adjustment is: the defoamer is added in the second step; the remaining steps and parameters are the same.

[0073] Comparative Example 2

[0074] The difference between this example and Example 1 is only that: the addition order of the surfactant and the defoamer is changed. Specifically, the adjustment is: all the surfactant is added in the second step; the remaining steps and parameters are the same.

[0075] Comparative Example 3

[0076] The difference between this example and Example 1 is only that: the addition amount of the surfactant is increased. Specifically, the dosage of the surfactant is adjusted to 0.8 part; the remaining steps and parameters are the same.

[0077] Comparative Example 4

[0078] The difference between this example and Example 1 is only that: the content of the defoamer is increased. Specifically, the dosage of the defoamer is adjusted to 0.8 part; the remaining steps and parameters are the same.

[0079] Test Example

[0080] This example conducts performance tests on the waterborne two-component glaze varnishes provided in Examples 1 to 3 and Comparative Examples 1 to 4.

[0081] Test method: Defoaming performance test: After the prepared waterborne two-component glaze varnish is prepared according to the ratio, use a long-haired roller (hair length > 1 cm) to roll-coat on a clean glass plate, and use the "W-shaped" method to roll back and forth twice, calculate the bubble elimination time. If the bubble elimination time > 20 s, it is unqualified; if the bubble elimination time < 20 s, it is qualified; Construction performance test: After the prepared waterborne two-component glaze varnish is prepared according to the ratio, use a long-haired roller (hair length > 1 cm) to roll-coat on a black and white card paper, and use the "W-shaped" method to roll back and forth twice, observe whether there is oil shrinkage. If there is oil shrinkage, the construction performance test fails; if there is no oil shrinkage, the construction performance test passes.

[0082] The test results are shown in Table 1.

[0083] Table 1

[0084]

[0085] As can be seen from Table 1: By comparing Comparative Example 1 with Example 1, it can be known that when the addition order of the defoamer is adjusted to the second addition, the defoamer is gradually consumed during the preparation of the varnish, resulting in unqualified defoaming; by comparing Comparative Example 2 with Example 1, it can be known that when all the surfactants are adjusted to the second addition, due to the mutual adsorption of the surfactants and other components, the defoamer will show too strong an effect, resulting in the phenomenon of oil shrinkage; by comparing Comparative Example 3 with Example 1, it can be known that when too much surfactant is added, there will be too much surfactant during roller coating, and the hydrophilic-lipophilic groups of the surfactant are too stable to foam, resulting in the problem that bubbles are not easily eliminated; by comparing Comparative Example 4 with Example 1, it can be known that when too much defoamer is added, there will be a problem that the compatibility between the defoamer and the system is not good, resulting in oil shrinkage during construction.

[0086] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. An easy-to-apply water-based two-component glaze varnish, characterized in that: The easy-to-apply water-based two-component glaze varnish comprises the following components: Component A: hydroxyl-containing acrylic emulsion, surfactant, defoamer, water and other additives; Component B: water dispersible isocyanate curing agent; Wherein, the surfactant and defoamer are added at once and quickly in the final stage of paint making; The weight percentage of the surfactant to the weight percentage of the easy-to-apply water-based two-component glaze varnish is ≥0.2% and ≤0.5%; The weight percentage of the defoamer to the weight percentage of the easy-to-apply water-based two-component glaze varnish is ≥0.2% and ≤0.4%; The construction weight ratio of the component A to the component B is 100:(15-20).

2. The easy-to-apply water-based two-component glaze varnish according to claim 1, characterized in that: The easy-to-apply water-based two-component glaze varnish comprises the following components in parts by weight: 40-70 parts of hydroxyl-containing acrylic emulsion, 0.2-0.5 parts of surfactant, 0.2-0.4 parts of defoaming agent, 20-40 parts of water and 2.2-7.5 parts of other additives.

3. The easy-to-apply water-based two-component glaze varnish according to claim 1, characterized in that: The HLB value of the surfactant is ≤6.

4. The easy-to-apply water-based two-component glaze varnish according to claim 1, characterized in that: The other auxiliary agents include one or more of a film-forming auxiliary agent, a preservative, a thickener, an anti-graffiti auxiliary agent and an anti-mildew agent.

5. The easy-to-apply water-based two-component glaze varnish according to claim 1, characterized in that: The surfactant is at least one of polyether polyol and fatty alcohol alkoxy polymer.

6. The easy-to-apply water-based two-component glaze varnish according to claim 1, characterized in that: The defoaming agent is a mineral oil-based defoaming agent.

7. A method for preparing the easy-to-apply water-based two-component glaze varnish according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: Adding water and hydroxyl-containing acrylic emulsion into a dispersion container and stirring evenly to obtain a first mixed material; Adding other additives to the first mixed material and stirring them evenly to obtain a second mixed material; Adding a surfactant and a defoamer to the second mixed material and stirring the mixture to obtain component A; The component A and the component B are stirred and mixed to obtain the easy-to-apply water-based two-component glaze varnish.

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