Water-based wear-resistant top-coat paint

Abstract

The invention discloses a water-based wear-resistant top-coat, and particularly relates to the technical field of coatings, and the water-based wear-resistant top-coat comprises the following components in parts by weight: 30-50 parts of water-based acrylic resin, 5-10 parts of nano silicon dioxide, 15-25 parts of a water-based polyurethane dispersion, 3-8 parts of a coalescing agent, 0.5-2 parts of a defoaming agent, 0.5-2 parts of a flatting agent, 1-3 parts of a thickening agent, 0.5-1.5 parts of a preservative and 20-40 parts of water. By adding the nano silicon dioxide, the wear resistance of the top-coat is remarkably improved, the top-coat is not easy to scratch and wear in daily use, the nano silicon dioxide is uniformly dispersed in a coating system to form a hard nano enhanced network structure, the external friction effect is effectively resisted, and the wear resistance of the top-coat is improved. Through reasonable matching of the water-based acrylic resin and the water-based polyurethane dispersoid, not only is the film-forming property of the top-coat ensured, but also the glossiness and the water resistance of the top-coat are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly relates to a waterborne wear-resistant clear topcoat. Background Art

[0002] With the enhancement of environmental awareness and the continuous improvement of the performance requirements for coatings, the demand for waterborne coatings in the market is increasing day by day. Traditional clear topcoats have deficiencies in wear resistance. Especially for waterborne clear topcoats, problems such as scratches and abrasions are likely to occur during use, affecting their decorative effects and service lives. In the fields of furniture, floors, doors and windows, etc., higher requirements are placed on the wear resistance of clear topcoats. Existing waterborne clear topcoats are difficult to meet the needs of these application scenarios. At the same time, some waterborne clear topcoats also have defects in drying speed, gloss and water resistance, restricting their wider applications. For example, some waterborne clear topcoats have a slow drying speed, resulting in low construction efficiency; the gloss is not high enough to achieve an ideal decorative effect; the water resistance is poor, and problems such as blistering and peeling are likely to occur in a humid environment. Therefore, it is of great significance to develop a waterborne wear-resistant clear topcoat with excellent wear resistance while taking into account drying speed, gloss and water resistance. Summary of the Invention

[0003] The main purpose of the present invention is to provide a waterborne wear-resistant clear topcoat, which can effectively solve the problem of insufficient wear resistance of waterborne clear topcoats, and at the same time improve its drying speed, gloss and water resistance to meet the needs of different application scenarios.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A waterborne wear-resistant clear topcoat, the waterborne wear-resistant clear topcoat comprises the following components by weight: 30 parts to 50 parts of waterborne acrylic resin, 5 parts to 10 parts of nano-silica, 15 parts to 25 parts of waterborne polyurethane dispersion, 3 parts to 8 parts of film-forming aid, 0.5 part to 2 parts of defoamer, 0.5 part to 2 parts of leveling agent, 1 part to 3 parts of thickener, 0.5 part to 1.5 parts of preservative, and 20 parts to 40 parts of water.

[0006] Preferably, the glass transition temperature of the waterborne acrylic resin is 20°C to 40°C.

[0007] Preferably, the particle size of the nano-silica is 20nm to 50nm.

[0008] Preferably, the solid content of the waterborne polyurethane dispersion is 30% to 40%.

[0009] Preferably, the film-forming aid is propylene glycol phenyl ether.

[0010] Preferably, the defoamer is a silicone defoamer, the leveling agent is a polyether-modified silicone leveling agent, the thickener is hydroxyethyl cellulose, and the preservative is an isothiazolinone preservative.

[0011] Preferably, the aqueous polyurethane dispersion is prepared from polyols, polyisocyanates, chain extenders, hydrophilic chain extenders, neutralizing agents, and water.

[0012] A method for preparing an aqueous wear-resistant clear topcoat, the method comprising the following steps:

[0013] a. Material preparation: 30 parts to 50 parts of aqueous acrylic resin, 5 parts to 10 parts of nano-silica, 15 parts to 25 parts of aqueous polyurethane dispersion, 3 parts to 8 parts of film-forming aid, 0.5 parts to 2 parts of defoamer, 0.5 parts to 2 parts of leveling agent, 1 part to 3 parts of thickener, 0.5 parts to 1.5 parts of preservative, and 20 parts to 40 parts of water;

[0014] b. Add the aqueous acrylic resin, aqueous polyurethane dispersion, and water into a stirring kettle, stir evenly at a speed of 300 r / min to 500 r / min, and the stirring time is 15 min to 30 min;

[0015] C. Then sequentially add nano-silica, film-forming aid, defoamer, leveling agent, thickener, and preservative, and continue stirring. The stirring speed is increased to 800 r / min to 1200 r / min, and the stirring time is 30 min to 60 min to fully mix all raw materials evenly to obtain an aqueous wear-resistant clear topcoat.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By adding nano-silica, the present invention significantly improves the wear resistance of the clear topcoat, making it less likely to appear scratches and wear during daily use. The nano-silica is evenly dispersed in the coating system to form a hard nano-reinforced network structure, effectively resisting the external friction.

[0018] 2. Through the reasonable combination of aqueous acrylic resin and aqueous polyurethane dispersion, the present invention not only ensures the film-forming performance of the clear topcoat but also improves its gloss and water resistance. The aqueous acrylic resin provides good gloss and hardness, and the aqueous polyurethane dispersion enhances the water resistance and flexibility of the paint film.

[0019] 3. By adding a film-forming aid, the present invention promotes the rapid drying of the paint film and improves the construction efficiency. At the same time, the synergistic effect of the defoamer, leveling agent, thickener, and preservative ensures the stability of the coating during production, storage, and construction, making the clear topcoat have good construction performance and a long storage period.

[0020] 4. The waterborne wear-resistant clear topcoat of the present invention has good environmental performance. Using water as a diluent, it reduces the volatilization of organic solvents, meets environmental protection requirements, and is suitable for surface coating of furniture, floors, doors and windows and other fields, with broad market prospects. Detailed implementation mode

[0021] To make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation modes.

[0022] A waterborne wear-resistant clear topcoat, the waterborne wear-resistant clear topcoat includes the following weight shares: 30 parts to 50 parts of waterborne acrylic resin, 5 parts to 10 parts of nano-silica, 15 parts to 25 parts of waterborne polyurethane dispersion, 3 parts to 8 parts of film-forming aid, 0.5 part to 2 parts of defoaming agent, 0.5 part to 2 parts of leveling agent, 1 part to 3 parts of thickening agent, 0.5 part to 1.5 parts of preservative, and 20 parts to 40 parts of water.

[0023] The glass transition temperature of the waterborne acrylic resin is 20°C to 40°C, the particle size of the nano-silica is 20nm to 50nm, the solid content of the waterborne polyurethane dispersion is 30% to 40%, the waterborne polyurethane dispersion is made of polyol, polyisocyanate, chain extender, hydrophilic chain extender, neutralizer and water, the film-forming aid is propylene glycol phenyl ether, the defoaming agent is silicone defoaming agent, the leveling agent is polyether-modified silicone leveling agent, the thickening agent is hydroxyethyl cellulose, and the preservative is isothiazolinone-based preservative.

[0024] A method for preparing a waterborne wear-resistant clear topcoat, the method includes the following steps:

[0025] a. Material preparation, 30 parts to 50 parts of waterborne acrylic resin, 5 parts to 10 parts of nano-silica, 15 parts to 25 parts of waterborne polyurethane dispersion, 3 parts to 8 parts of film-forming aid, 0.5 part to 2 parts of defoaming agent, 0.5 part to 2 parts of leveling agent, 1 part to 3 parts of thickening agent, 0.5 part to 1.5 parts of preservative, and 20 parts to 40 parts of water;

[0026] b. Add the waterborne acrylic resin, waterborne polyurethane dispersion and water into a stirring kettle, stir evenly at a speed of 300r / min to 500r / min, and the stirring time is 15min to 30min;

[0027] C. Then add nano-silica, film-forming aid, defoaming agent, leveling agent, thickening agent and preservative in sequence, continue to stir, increase the stirring speed to 800r / min to 1200r / min, and the stirring time is 30min to 60min to make each raw material fully mixed evenly to obtain the waterborne wear-resistant clear topcoat.

[0028] Example 1

[0029] In this embodiment, the raw materials of the waterborne wear-resistant clear topcoat include, by weight: 30 parts of waterborne acrylic resin, 5 parts of nano-silica, 15 parts of waterborne polyurethane dispersion, 6 parts of film-forming aid, 1 part of defoamer, 1 part of leveling agent, 1 part of thickener, 1 part of preservative, and 40 parts of water, and the waterborne wear-resistant clear topcoat is prepared.

[0030] Example 2

[0031] In this embodiment, the raw materials of the waterborne wear-resistant clear topcoat include, by weight: 50 parts of waterborne acrylic resin, 6 parts of nano-silica, 16 parts of waterborne polyurethane dispersion, 4 parts of film-forming aid, 1 part of defoamer, 0.5 part of leveling agent, 1 part of thickener, 0.5 part of preservative, and 20 parts of water, and the waterborne wear-resistant clear topcoat is prepared according to the preparation steps of the waterborne wear-resistant clear topcoat.

[0032] Example 3

[0033] In this embodiment, the raw materials of the waterborne wear-resistant clear topcoat include, by weight: 40 parts of waterborne acrylic resin, 7 parts of nano-silica, 17 parts of waterborne polyurethane dispersion, 6 parts of film-forming aid, 1 part of defoamer, 1 part of leveling agent, 2 parts of thickener, 1 part of preservative, and 25 parts of water, and the waterborne wear-resistant clear topcoat is prepared according to the preparation steps of the waterborne wear-resistant clear topcoat.

[0034] Example 4

[0035] In this embodiment, the raw materials of the waterborne wear-resistant clear topcoat include, by weight: 35 parts of waterborne acrylic resin, 7 parts of nano-silica, 17 parts of waterborne polyurethane dispersion, 6 parts of film-forming aid, 1 part of defoamer, 1 part of leveling agent, 2 parts of thickener, 1 part of preservative, and 30 parts of water, and the waterborne wear-resistant clear topcoat is prepared according to the preparation steps of the waterborne wear-resistant clear topcoat.

[0036] Example 5

[0037] In this embodiment, the raw materials of the waterborne wear-resistant clear topcoat include, by weight: 45 parts of waterborne acrylic resin, 7 parts of nano-silica, 17 parts of waterborne polyurethane dispersion, 6 parts of film-forming aid, 1 part of defoamer, 1 part of leveling agent, 2 parts of thickener, 1 part of preservative, and 20 parts of water, and the waterborne wear-resistant clear topcoat is prepared according to the preparation steps of the waterborne wear-resistant clear topcoat.

[0038] Comparative Example 1

[0039] In this comparative example, the raw materials of the waterborne wear-resistant clear topcoat include, by weight: 50 parts of waterborne acrylic resin, 16 parts of waterborne polyurethane dispersion, 4 parts of film-forming aid, 1 part of defoamer, 0.5 part of leveling agent, 1 part of thickener, 0.5 part of preservative, and 20 parts of water.

[0040] Based on the method for preparing the waterborne wear-resistant clear topcoat, nano-silica is removed in this comparative example, and other preparation steps remain unchanged to prepare the waterborne wear-resistant clear topcoat.

[0041] Comparative Example 2

[0042] In this comparative example, the raw materials of the waterborne wear-resistant clear topcoat include, by weight: 50 parts of waterborne acrylic resin, 6 parts of nano-silica, 4 parts of film-forming aid, 1 part of defoamer, 0.5 part of leveling agent, 1 part of thickener, 0.5 part of preservative, and 20 parts of water.

[0043] Based on the method for preparing the waterborne wear-resistant clear topcoat, the waterborne polyurethane dispersion was removed in this comparative example, and other preparation steps remained unchanged to obtain the waterborne wear-resistant clear topcoat.

[0044] The waterborne wear-resistant clear topcoats prepared in the above Examples 1-5 and Comparative Examples 1-2 were respectively subjected to performance tests according to the following test methods:

[0045] 1. Abrasion weight loss

[0046] According to GB / T 1768-2006 "Paints and varnishes - Determination of resistance to abrasion - Rotating rubber wheel method", the wear resistance of the above three clear topcoat samples was tested, and the weight loss of the paint film after a certain number of abrasions was recorded.

[0047] 2. Drying time

[0048] The drying time was determined according to GB / T 1728-1979 "Method for determination of drying time of paint films and putty films".

[0049] 3. Glossiness

[0050] The glossiness was determined according to GB / T 9754-2007 "Paints and varnishes - Determination of specular gloss at 20°, 60° and 85° of non-metallic paint films";

[0051] 4. Water resistance time

[0052] According to GB / T 1733-1993 "Method for determination of water resistance of paint films", the water resistance test was carried out, and the changes of the paint film after soaking in water for a certain time were recorded. The test results are shown in Table 1:

[0053] Table 1: Data table of performance test of waterborne wear-resistant clear topcoat

[0054]

[0055] Result analysis

[0056] Examples 1 - 5 As can be seen from the above table, the wear loss of Example 2 is 30 mg / 1000r, which is the smallest, indicating that its wear resistance is the best. This is due to the relatively high content of nano-silica and aqueous polyurethane dispersion. The wear loss of Example 1 is 5030 mg / 1000r, which is relatively large, and its wear resistance is slightly inferior. The drying time of Example 2 is the shortest at 1.5h, and the construction efficiency is the highest. The dosage of propylene glycol phenyl ether plays a good role in promoting drying in this example. The gloss of Example 2 is the highest at 90 GU, and the decorative effect is the best. The ratio of aqueous acrylic resin and aqueous polyurethane dispersion significantly improves the gloss in this example. Example 2 has the longest water resistance time of 72h, and its water resistance is the best. The high solid content of the aqueous polyurethane dispersion and the synergistic effect of various components endow the paint film with good water resistance performance.

[0057] In summary: Considering all performance indicators, Example 2 shows the best performance in terms of wear resistance, drying speed, gloss, and water resistance, and is most suitable to meet the actual application requirements; the performance of Example 3 is relatively balanced, and it can be selected according to specific usage scenarios; Example 1 is slightly lacking in some performances, but it can also be used in occasions where the requirements for wear and water resistance are not particularly high. Moreover, by adding nano-silica, the wear resistance of the clear topcoat is significantly improved, making it less prone to scratches and wear during daily use. The nano-silica is evenly dispersed in the coating system, forming a hard nano-reinforced network structure, effectively resisting external friction. Through the reasonable combination of aqueous acrylic resin and aqueous polyurethane dispersion, not only the film-forming performance of the clear topcoat is ensured, but also its gloss and water resistance are improved. The aqueous acrylic resin provides good gloss and hardness, and the aqueous polyurethane dispersion enhances the water resistance and flexibility of the paint film, making the clear topcoat have good construction performance and a long storage period. It has good environmental performance, meets environmental requirements, and is suitable for surface coating in multiple fields such as furniture, floors, and doors and windows, with broad market prospects.

[0058] In addition, as can be seen from Comparative Examples 1 - 2 and the above table, nano-silica and aqueous polyurethane dispersion were not added during the production of the waterborne wear-resistant clear topcoat in Comparative Examples 1 and 2, resulting in worse performance in terms of wear loss, drying time, gloss, and water resistance time of the prepared waterborne wear-resistant clear topcoat compared to that of the waterborne wear-resistant clear topcoat prepared in Examples 1 - 5.

[0059] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention as claimed. The scope of the present invention as claimed is defined by the appended claims and their equivalents.

Claims

1. An aqueous wear-resistant clear topcoat, characterized in that, The waterborne wear-resistant clear topcoat comprises the following components by weight: 30 to 50 parts of waterborne acrylic resin, 5 to 10 parts of nano-silica, 15 to 25 parts of waterborne polyurethane dispersion, 3 to 8 parts of film-forming auxiliary, 0.5 to 2 parts of defoamer, 0.5 to 2 parts of leveling agent, 1 to 3 parts of thickener, 0.5 to 1.5 parts of preservative, and 20 to 40 parts of water.

2. The waterborne wear-resistant clear topcoat according to claim 1, wherein: The glass transition temperature of the waterborne acrylic resin is 20°C to 40°C.

3. A waterborne wear-resistant clear topcoat according to claim 1, characterized in that: The particle size of the nano-silica is 20nm to 50nm.

4. The waterborne wear-resistant clear topcoat according to claim 1, characterized in that: The solid content of the waterborne polyurethane dispersion is 30% to 40%.

5. A waterborne wear-resistant clear topcoat according to claim 1, characterized in that: The film-forming auxiliary is propylene glycol phenyl ether.

6. The waterborne wear-resistant clear topcoat according to claim 1, wherein: The defoamer is a silicone defoamer, the leveling agent is a polyether-modified silicone leveling agent, the thickener is hydroxyethyl cellulose, and the preservative is an isothiazolinone-based preservative.

7. An aqueous wear-resistant clear topcoat according to claim 1, characterized in that: The waterborne polyurethane dispersion is prepared from polyol, polyisocyanate, chain extender, hydrophilic chain extender, neutralizer and water.

8. A method for preparing the waterborne wear-resistant clear topcoat according to any one of claims 1-7, the method comprising the following steps: a. Material preparation, 30 to 50 parts of waterborne acrylic resin, 5 to 10 parts of nano-silica, 15 to 25 parts of waterborne polyurethane dispersion, 3 to 8 parts of film-forming auxiliary, 0.5 to 2 parts of defoamer, 0.5 to 2 parts of leveling agent, 1 to 3 parts of thickener, 0.5 to 1.5 parts of preservative, and 20 to 40 parts of water; b. Add the waterborne acrylic resin, waterborne polyurethane dispersion and water into a stirring kettle, stir evenly at a speed of 300r / min to 500r / min, and the stirring time is 15min to 30min; C. Then successively add nano-silica, film-forming auxiliary, defoamer, leveling agent, thickener and preservative, continue stirring, increase the stirring speed to 800r / min to 1200r / min, and the stirring time is 30min to 60min to fully mix and homogenize all raw materials to obtain the waterborne wear-resistant clear topcoat.

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