Scratch-resistant agent, coating composition and preparation method and application thereof

Abstract

The invention discloses a scratch-resistant agent, a coating composition and a preparation method and application thereof, and relates to the technical field of coatings. The scratch-resistant agent disclosed by the invention comprises sand flour, high molecular weight polydimethylsiloxane and low molecular weight polydimethylsiloxane, the weight-average molecular weight of the high-molecular-weight polydimethylsiloxane is greater than 100,000; the weight-average molecular weight of the low-molecular-weight polydimethylsiloxane is less than or equal to 4000. The scratch-resistant agent provided by the invention can improve the scratch resistance of the coating composition, the coating composition serving as velvet effect art paint not only ensures the pearlescent effect, but also has excellent scratch resistance and black mark resistance, and in addition, the basic properties of a formed paint film can meet daily use requirements, such as scrub resistance, water resistance and alkali resistance.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a scratch-resistant agent, a coating composition, and a preparation method and application thereof. Background Art

[0002] In recent years, the art paint market has been booming. Different from the single-color decorative effect of traditional latex paint, art paint can provide consumers with different decorative effects. It can not only achieve rich color levels, but also diversify the shape, and provide texture or different design sense painting services. Therefore, the market demand for art paint is increasing, and the market size is also increasing. Among them, velvet effect art paint (or pearl effect art paint) has a soft luster, can present mottled light and shadow effects under different light, and has a velvety smooth touch. It has been widely welcomed in the market for its unique texture and color effects, and has become a popular choice among wall decoration materials.

[0003] Velvet effect art paint has a smooth and delicate surface and a thin coating film. In daily life, it is easy to produce obvious scratches and black marks on the surface due to friction from furniture movement, cleaning and wiping, and the scratch resistance is poor, which affects the paint film effect. Conventional art paint can be used with a topcoat varnish to provide protection for the paint film, but velvet effect art paint has a unique pearlescent effect and cannot be used with a topcoat varnish, otherwise it will affect the light and shadow presentation of the pearlescent effect, so it is difficult to effectively improve the scratch resistance. Summary of the invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, the purpose of the present invention is to provide a scratch resistance agent, which can be applied to the coating to improve the scratch resistance of the paint film without affecting the appearance effect of the paint film, such as the pearlescent effect.

[0005] A second aspect of the present invention is to provide a coating composition.

[0006] The third aspect of the present invention is to provide a method for preparing a coating composition.

[0007] The fourth aspect of the present invention is to provide a use of a scratch resistant agent or a coating composition.

[0008] A fifth aspect of the present invention is to provide a painted product.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

[0010] The first aspect of the present invention provides a scratch resistant agent, comprising sand flour, high molecular weight polydimethylsiloxane and low molecular weight polydimethylsiloxane; the weight average molecular weight of the high molecular weight polydimethylsiloxane is greater than 100,000; the weight average molecular weight of the low molecular weight polydimethylsiloxane is less than or equal to 4000.

[0011] The scratch-resistant agent of the present invention is added with sand powder and is used in combination with high molecular weight and low molecular weight polydimethylsiloxane. When used in a coating composition, it can synergistically improve the scratch resistance of the formed paint film in multiple dimensions while ensuring the effect of the paint film, especially for velvet art paint, without affecting the pearlescent effect of the paint film.

[0012] The sand powder in the scratch resistant agent of the present invention is spherical in shape, and when applied to a coating composition, it can reduce the contact area with the friction object on the surface of the paint film and reduce the friction coefficient. At the same time, the sand powder particles have a certain toughness, which improves the toughness of the scratch resistant agent. When used in the coating composition, the paint film can have a certain elastic recovery ability when impacted, thereby reducing the generation of scratches.

[0013] In the present invention, the combination of high molecular weight polydimethylsiloxane and low molecular weight polydimethylsiloxane can form a protective film on the surface of the paint film to reduce friction and wear. The molecular weight combination of polydimethylsiloxane is the key to improving the scratch resistance of the paint film by the scratch resistant agent. When the molecular weight of the high molecular weight polydimethylsiloxane is insufficient, the scratch resistance of the scratch resistant agent is poor.

[0014] In some embodiments of the present invention, the mass ratio of the high molecular weight polydimethylsiloxane to the low molecular weight polydimethylsiloxane is 1:(2-8).

[0015] In some embodiments of the present invention, the mass ratio of the high molecular weight polydimethylsiloxane to the low molecular weight polydimethylsiloxane is 1:(3-5).

[0016] Specifically, the mass ratio of the high molecular weight polydimethylsiloxane to the low molecular weight polydimethylsiloxane of the present invention can be 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, or 1:8.

[0017] The addition ratio of high molecular weight polydimethylsiloxane and low molecular weight polydimethylsiloxane will affect the appearance effect and scratch resistance of the paint film finally formed by the coating composition. In the present invention, the anti-scratch effect of high molecular weight polydimethylsiloxane is significant. After the use of low molecular weight polydimethylsiloxane, the anti-scratch effect can be further improved, and the anti-black mark effect is also enhanced. In addition, the addition of low molecular weight polydimethylsiloxane to the scratch resistant agent of the present invention can also improve the construction feel, reduce the dragging feeling and resistance during the brushing process, make the coating smoother during rubbing and coating construction, and can also improve the smoothness of the coating construction, so that the surface of the paint film after the construction is completed is smoother and feels better.

[0018] In some embodiments of the present invention, the particle size of the sand flour is 3 to 20 μm.

[0019] In some embodiments of the present invention, the particle size of the sand flour is 5 to 15 μm.

[0020] In some specific embodiments of the present invention, the particle size of the sand flour is 5 to 10 μm.

[0021] In some examples of the present invention, the particle size of the sand flour is 6-10 μm.

[0022] The particle size of the sand flour is relatively uniform. When the scratch-resistant agent of the present invention is used in a coating, the particle size of the sand flour will affect the roughness of the paint film appearance.

[0023] In some embodiments of the present invention, the weight average molecular weight of the low molecular weight polydimethylsiloxane is 400-4000.

[0024] In some embodiments of the present invention, the weight average molecular weight of the low molecular weight polydimethylsiloxane is 1000-3000.

[0025] In some embodiments of the present invention, the anti-scratch agent comprises the following components by weight:

[0026] 1-4 parts of sand flour, 0.5-1 parts of high molecular weight polydimethylsiloxane, and 1-5 parts of low molecular weight polydimethylsiloxane.

[0027] In some embodiments of the present invention, the anti-scratch agent comprises the following components in parts by mass:

[0028] 1-4 parts of sand flour, 0.5-1 part of high molecular weight polydimethylsiloxane, and 1.5-4.5 parts of low molecular weight polydimethylsiloxane.

[0029] In some specific embodiments of the present invention, the anti-scratch agent comprises the following components in parts by mass:

[0030] 1-3 parts of sand flour, 0.5-0.8 parts of high molecular weight polydimethylsiloxane, and 1.5-3 parts of low molecular weight polydimethylsiloxane.

[0031] By further limiting the amount of each component in the scratch resistant agent, it is beneficial to improve the scratch resistance of the scratch resistant agent on the paint film while ensuring the appearance of the paint film. For example, a high amount of sand powder will cause the surface of the paint film to be rough, affecting the pearlescent effect of the paint film.

[0032] In addition, in conventional coatings that add sand flour to improve scratch resistance, the content of sand flour in the coating composition is relatively high, up to 50%, and can only improve the scratch resistance effect, and has almost no effect on the appearance of the paint film and the black mark resistance. The scratch resistance agent of the present invention can improve the scratch resistance at a low amount of sand flour.

[0033] The second aspect of the present invention provides a coating composition comprising the anti-scratch agent according to the first aspect of the present invention.

[0034] The scratch-resistant agent of the present invention has an excellent scratch-resistant effect. When used in a coating composition, the scratch-resistant performance of the paint film formed therefrom can be improved, while ensuring the basic performance indicators of the paint film, such as the appearance of the paint film, the water resistance, alkali resistance, scrub resistance of the paint film, and the construction feel of the coating. The coating composition of the present invention can be used for velvet effect art paint, while ensuring the pearlescent effect of the velvet effect art paint, the scratch-resistant performance is improved.

[0035] In some embodiments of the present invention, the coating composition is a pearlescent effect artistic paint, that is, a velvet effect artistic paint.

[0036] In some embodiments of the present invention, the coating composition comprises the following components in parts by mass:

[0037] 10-40 parts of resin emulsion, 2.5-10 parts of scratch resistant agent, 0-65 parts of auxiliary agent.

[0038] In some embodiments of the present invention, the anti-scratch agent includes 1 to 4 parts of sand flour, 0.5 to 1 part of high molecular weight polydimethylsiloxane, and 1 to 5 parts of low molecular weight polydimethylsiloxane.

[0039] In some embodiments of the present invention, the auxiliary agent includes at least one of pearlescent pigment, talc, film-forming aid, pH adjuster, thickener, wetting agent, dispersant, defoamer, mildewproof agent, bactericide, preservative, cellulose and antifreeze agent.

[0040] In some embodiments of the present invention, when the auxiliary agent is pearlescent pigment, the weight fraction is 3 to 30 parts.

[0041] In some embodiments of the present invention, when the auxiliary agent is talcum powder, the weight fraction is 0 to 7 parts.

[0042] In some embodiments of the present invention, when the auxiliary agent is a film-forming auxiliary agent, the weight fraction is 0.1 to 4 parts.

[0043] In some embodiments of the present invention, when the auxiliary agent is a pH regulator, the weight fraction is 0.05 to 4 parts.

[0044] In some embodiments of the present invention, when the auxiliary agent is a thickener, the weight fraction is 0.1 to 6 parts.

[0045] In some embodiments of the present invention, when the auxiliary agent is a wetting agent, the mass fraction is 0.1 to 1 part.

[0046] In some embodiments of the present invention, when the auxiliary agent is a dispersant, the mass fraction is 0.1 to 1 part.

[0047] In some embodiments of the present invention, when the auxiliary agent is a defoaming agent, the weight fraction is 0.1 to 5 parts.

[0048] In some embodiments of the present invention, when the auxiliary agent is a mildew preventer, the weight fraction is 0.1 to 3 parts.

[0049] In some embodiments of the present invention, when the auxiliary agent is a fungicide, the weight fraction is 0.1 to 3 parts.

[0050] In some specific embodiments of the present invention, the auxiliary agent includes but is not limited to the following options:

[0051] The pearlescent pigment is mica coated with a metal oxide layer; the metal element of the metal oxide layer includes at least one of titanium dioxide and ferric oxide;

[0052] The resin emulsion comprises pure acrylic emulsion;

[0053] The film-forming aid includes at least one of alcohol esters and ethers; for example, at least one of coatol, CZ-12, and coatol290;

[0054] The pH regulator includes an organic alcohol amine pH regulator; for example, Vantex-T;

[0055] The thickener includes at least one of a cellulose thickener, a polyurethane thickener, and an alkali swelling thickener; wherein the cellulose thickener may be 250MBR and / or NATROSOL 250HBR; the polyurethane thickener may be NHS380 and / or Acrysol RM-8W; the alkali swelling thickener may be at least one of AR9359, AR6159, and Acrysol RM-7;

[0056] The wetting agent includes a nonionic surfactant; for example, PF-20, ADS1069;

[0057] The dispersant includes anionic dispersants, specifically including at least one of polycarboxylates, polyphosphates, and polyacrylates; for example, AD7300A, AD5040, and X1005;

[0058] The defoamer includes at least one of an organosilicon defoamer and a mineral oil defoamer; wherein the organosilicon defoamer includes Defoamer 334 and / or SN-DEFOAMER 154; and the mineral oil defoamer includes NXZ and / or FoamStar ST2410AC.

[0059] In some embodiments of the present invention, the particle size distribution of the pearlescent pigment is 6 to 180 μm.

[0060] In some specific embodiments of the present invention, the particle size distribution of the pearlescent pigment is 10-100 μm.

[0061] In some examples of the present invention, the particle size distribution of the pearlescent pigment is 10-60 μm.

[0062] In some embodiments of the present invention, the glass transition temperature of the resin emulsion is ≥10°C.

[0063] In some specific embodiments of the present invention, the glass transition temperature of the resin emulsion is ≥20°C.

[0064] In some examples of the present invention, the glass transition temperature of the resin emulsion is ≥25°C.

[0065] In the present invention, the thickener, pH regulator, wetting and dispersing agent, defoaming agent, film-forming aid, antifreeze agent, preservative, and mildewproofing agent are not particularly limited and can be selected from conventional materials in the art, prepared by conventional methods, or purchased from the market.

[0066] The invention uses sand flour, high molecular weight polydimethylsiloxane and low molecular weight polydimethylsiloxane in combination to form a scratch-resistant agent, and combines pearl powder and resin emulsion to obtain a coating composition with a scratch pearlescent effect, which is suitable for velvet effect artistic paint.

[0067] In some specific embodiments of the present invention, the coating composition includes the following components in parts by mass:

[0068] 30-40 parts of resin emulsion, 3-6 parts of scratch resistant agent, 1-2 parts of thickener, 0.1-0.3 parts of pH adjuster, 0.5-0.7 parts of dispersant, 0.5-0.7 parts of wetting agent, 2-4 parts of antifreeze agent, 0.7-1.2 parts of defoaming agent, 1-3 parts of talc, 20-30 parts of pearlescent pigment, 2-3 parts of film-forming aid, 1-2 parts of preservative, and 1-2 parts of mildewproof agent.

[0069] In some examples of the present invention, the coating composition further comprises 20 to 30 parts by mass of water.

[0070] The third aspect of the present invention provides a method for preparing the coating composition according to the first aspect of the present invention, comprising the following steps:

[0071] The scratch resistant agent is mixed with other components to obtain the coating composition.

[0072] In some embodiments of the present invention, the method for preparing the coating composition comprises the following steps:

[0073] The auxiliary agent is mixed for the first time, and the components of the scratch-resistant agent are added and mixed for the second time to form a first mixed liquid; the resin emulsion is added to the first mixed liquid, and the coating composition is obtained after the third mixing.

[0074] In some embodiments of the present invention, the mixing method is stirring.

[0075] In some embodiments of the present invention, the stirring speed of the first mixing is 200-300 r / min.

[0076] In some embodiments of the present invention, the stirring speed of the second mixing is 700-2000 r / min.

[0077] In some specific embodiments of the present invention, the stirring speed of the second mixing is 800-1500 r / min.

[0078] In some examples of the present invention, the stirring speed of the second mixing is 900-1200 r / min.

[0079] In some embodiments of the present invention, after the first mixing, the rotation speed is adjusted to 500-600 r / min and then the anti-scratch agent and talcum powder are added.

[0080] It should be noted that, when adding the anti-scratch agent or the resin emulsion, some auxiliary agents are also added.

[0081] The fourth aspect of the present invention provides a use of the scratch-resistant agent described in the first aspect of the present invention or the coating composition described in the second aspect of the present invention in preparing a paint film.

[0082] In some embodiments of the present invention, the scratch-resistant agent or coating composition is used to prepare a velvet-effect artistic paint film.

[0083] Velvet effect artistic paint film is also called pearlescent effect artistic paint film.

[0084] Velvet-like pearlescent effect art paint has a smooth and delicate surface and a thin coating film. In daily life, it is easy to produce obvious scratches and black marks on the surface due to friction caused by furniture movement and other activities, affecting the decorative effect. The paint film of the coating composition of the present invention has excellent scratch resistance and can ensure the pearlescent effect of the paint film, especially for preparing velvet effect art paint film, which meets the requirements of daily life.

[0085] In some embodiments of the present invention, the paint film is formed by coating or spraying on the surface of the substrate.

[0086] Specifically, the substrate includes but is not limited to wall surface, putty board, asbestos-free fiberboard, and fireproof board.

[0087] The fifth aspect of the present invention provides a painted product, comprising a substrate and a paint film; the paint film is obtained by coating or spraying the coating composition according to any one of the second aspects of the present invention.

[0088] In some embodiments of the present invention, the method for applying the coating composition comprises the following steps:

[0089] S1. The coating composition of the second aspect of the present invention is diluted to the desired coating viscosity and stirred evenly;

[0090] S2. Coating the wall surface with the coating composition after stirring evenly in step S1;

[0091] S3. Drying and post-processing as needed.

[0092] In some embodiments of the present invention, the coating in step S2 comprises the following steps:

[0093] S21. Use an interior wall roller to evenly roll the paint in different directions with short strokes;

[0094] S22. Use a special-shaped washboard to rub the paint in a figure-eight pattern to create a velvet texture;

[0095] S23. After all the coating is completed, use the shaped rub board to rub the paint film in an eight-shaped motion to make it flat before the surface dries.

[0096] In some embodiments of the present invention, the substrate comprises a wooden board for furniture, decoration or renovation.

[0097] Compared with the prior art, the present invention has the following beneficial effects:

[0098] The scratch-resistant agent provided by the present invention has excellent scratch-resistant effect, and can improve the scratch-resistant performance of the paint film formed by the coating composition while ensuring that the basic performance of the paint film meets the requirements, and does not cause obvious damage to the appearance of the paint film.

[0099] The scratch-resistant agent can be used in a coating composition to improve the scratch resistance of the coating composition while ensuring the paint film appearance effect and other basic properties of the coating composition. The obtained coating composition can be used as a velvet effect artistic paint, and the formed paint film can solve the problem of poor scratch resistance of traditional velvet effect artistic paint due to its smooth and delicate surface and thin coating film, while not affecting the pearlescent effect presented by the velvet effect artistic paint film. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] Figure 1 This is a picture of scratches and black marks on the surface of commercially available velvet art paint; Figure 1 a is the scratch image, Figure 1 b is the black mark image.

[0101] Figure 2 The plastic scratch resistance of the paint film formed by the coating composition of Example 1 of the present invention and the paint films formed by the commercially available artistic paints of Comparative Examples 8 to 9.

[0102] Figure 3 The paint films formed by the coating composition of Example 1 of the present invention and the paint films formed by the commercially available artistic paints of Comparative Examples 8 to 9 have a scratch resistance against stainless steel and black rubber. DETAILED DESCRIPTION

[0103] The present invention is further described in detail below by specific examples. Unless otherwise specified, the raw materials, reagents or devices used in the examples and comparative examples can be obtained from conventional commercial sources or can be obtained by prior art methods. Unless otherwise specified, the experiments or test methods are conventional methods in the art.

[0104] Some of the raw materials used in the following examples and comparative examples of the present invention are shown in Table 1 below.

[0105] Table 1 Raw materials of the embodiments of the present invention and the comparative examples

[0106]

[0107] The scheme of the present invention is described in detail below with reference to specific embodiments and comparative examples.

[0108] Example 1

[0109] This embodiment provides a scratch-resistant agent, which includes, by weight, 2 parts of sand flour, 0.5 parts of high molecular weight polydimethylsiloxane, and 2 parts of low molecular weight polydimethylsiloxane.

[0110] The anti-scratch agent was used to prepare a coating composition. The specific formula of the coating composition is shown in Table 2.

[0111] The preparation method of the coating composition of this embodiment comprises the following steps:

[0112] Weigh water according to the mass ratio and add it to the dispersion tank, control the speed at 200-300 r / min, add cellulose thickener (thickener 1), organic alcohol amine pH regulator, wetting agent, dispersant, antifreeze agent, silicone defoamer (defoamer 2), adjust the speed to 500-600 r / min, add polydimethylsiloxane, sand flour, talcum powder, adjust the speed to 1000 r / min, disperse for 15 minutes, and form a first mixed solution;

[0113] The rotation speed is controlled at 500-600 r / min, and water, preservative, mildewproof agent, pure acrylic emulsion, film-forming aid, pearl powder, mineral oil defoamer (defoamer 1), polyurethane thickener (thickener 2), and alkali swelling thickener (thickener 3) are added to the first mixed liquid, and dispersed for 15 minutes to obtain a coating composition.

[0114] Embodiment 2-3

[0115] Examples 2 to 3 provide a scratch resistant agent, which is different from Example 1 only in that the mass ratios of high molecular weight polydimethylsiloxane to low molecular weight polydimethylsiloxane in the scratch resistant agent are 1:4, 1:5, and 1:3, respectively.

[0116] The anti-scratch agent was used to prepare a coating composition. The specific formula of the coating composition is shown in Table 3.

[0117] The preparation method of the coating composition of Examples 2 to 3 is the same as that of Example 1.

[0118] Comparative Examples 1 to 3

[0119] Comparative Examples 1 to 3 provide a scratch resistant agent, which is different from Example 1 only in that the high molecular weight polydimethylsiloxane in Comparative Example 1 is 30,000 molecular weight polydimethylsiloxane. 8530H; in Comparative Example 2, high molecular weight polydimethylsiloxane is not added; in Comparative Example 3, low molecular weight polydimethylsiloxane is not added.

[0120] The scratch-resistant agents of Comparative Examples 1 to 3 were used to prepare coating compositions. See Table 2 for the specific formulas of the coating compositions.

[0121] The preparation methods of the coating compositions in Comparative Examples 1 to 3 are the same as those in Example 1.

[0122] In order to further study the influence of different mass ratios of high molecular weight polydimethylsiloxane to low molecular weight polydimethylsiloxane in the scratch resistant agent and obtain a mass ratio range more suitable for the scratch resistant agent formulation of the present invention, the present invention further conducted experiments of comparative examples 4 to 5.

[0123] Comparative Examples 4-5

[0124] Comparative Examples 4 to 5 provide a scratch resistant agent, which is different from Example 1 only in that the mass ratio of high molecular weight polydimethylsiloxane to low molecular weight polydimethylsiloxane in Comparative Example 4 is 1:1.5; the mass ratio of high molecular weight polydimethylsiloxane to low molecular weight polydimethylsiloxane in Comparative Example 5 is 1:9.

[0125] The anti-scratch agent of Comparative Examples 4 to 5 was used to prepare the coating composition. The specific formula of the coating composition is shown in Table 3.

[0126] The preparation methods of the coating compositions in Comparative Examples 4 to 5 are the same as those in Example 1.

[0127] In order to study the effects of the particle size and dosage of the sand flour in the anti-scratch agent of the present invention, the present invention further conducted experiments of Comparative Examples 6 to 7.

[0128] Comparative Examples 6-7

[0129] Comparative Examples 6-7 provide a scratch-resistant agent, which is different from Example 1 only in that the average particle size of the sand flour in Comparative Example 6 is 30 μm; and the weight portion of the sand flour in Comparative Example 7 is 5 parts.

[0130] The scratch resistant agent of Comparative Examples 6-7 was used to prepare the coating composition. The specific formula of the coating composition is shown in Table 4. The preparation method of the coating composition in Comparative Examples 6-7 is the same as that in Example 1.

[0131] Comparative Examples 8 to 9

[0132] Two commonly available velvet effect art paints are used.

[0133] Table 2 Formulation of coating compositions of Example 1 and Comparative Examples 1 to 3 (parts by mass)

[0134]

[0135]

[0136] Table 3 Formulation of coating compositions of Examples 1 to 3 and Comparative Examples 4 to 5 (parts by mass)

[0137]

[0138] Table 4 Formulation of coating compositions of Example 1 and Comparative Examples 6 to 7 (parts by mass)

[0139]

[0140] Results

[0141] The coating compositions obtained in the above examples and comparative examples were tested for their performance.

[0142] 1. The test methods for container state, coating appearance, scrub resistance, alkali resistance and water resistance refer to standard GB / T9756-2018.

[0143] 2. Construction test: at 1m 2 The matching primer is applied on the putty board, and after the primer is dried, a construction test is performed using the coating method provided by the present invention to evaluate the construction feel (whether it is smooth when rubbed, or poor feel if it is not smooth), the appearance of the paint film (whether there is pearl powder accumulation, and whether the light and shadow effect is obvious), and whether the final paint film feels fine and smooth.

[0144] 3. The following tests of the present invention selected three representative materials, namely hard plastic, 316 stainless steel and black rubber, in combination with life scenarios, and performed scratch resistance tests according to the following methods:

[0145] 1) Use hard plastic to scrape the paint film back and forth to see if there are any scratches on the paint film;

[0146] 2) Use a 316 stainless steel cylinder with a load of 300g to scratch 20 times, and use a colorimeter to measure the color difference ΔE between the scratched area and the unscratched area to characterize the degree of blackening of the paint film;

[0147] 3) Use a black rubber cylinder with a load of 300g to scratch 20 times. After wiping with a soft cloth, use a colorimeter to measure the color difference ΔE between the scratched area and the unscratched area to characterize the degree of blackening of the paint film.

[0148] The test results are shown in Tables 5 to 7.

[0149] Table 5 Comparison of performance test results of coating compositions of Example 1 and Comparative Examples 1 to 3

[0150]

[0151] It can be seen from Table 5 that the coating composition of Example 1 of the present invention uses the scratch-resistant agent of the present invention, and the basic properties of the paint film formed therefrom can meet the relevant test standards, and the scratch resistance and black mark resistance effects are excellent, that is, the paint film has excellent scratch resistance, and the velvet effect of the paint film is guaranteed. The paint film has a good appearance and also has good scrub resistance, alkali resistance and water resistance.

[0152] The high molecular weight polydimethylsiloxane used in Comparative Example 1 has a molecular weight of less than 100,000, about 30,000, and has poor scratch resistance. The paint film has obvious scratches, and the color difference value increases after scratching, the black mark resistance decreases, and the overall scratch resistance performance decreases.

[0153] In Comparative Example 2, only low molecular weight polydimethylsiloxane was used, and the scratch resistance and black mark resistance were also poor, and the scratch resistance was significantly reduced compared with Example 1. In Comparative Example 3, only high molecular weight polydimethylsiloxane was used, and the paint film had significantly poor black mark resistance and large color difference. Compared with the combination of high and low molecular weight, the scratch resistance was also significantly reduced. In addition, the paint film construction feel formed by the coating composition of Comparative Example 3 is not as good as other solutions. This shows that there is a good synergistic effect between high and low molecular weight polydimethylsiloxanes, and the use of high molecular weight and low molecular weight polydimethylsiloxanes with a molecular weight greater than 100,000 is beneficial to improving the scratch resistance.

[0154] Table 6 Comparison of performance test results of coating compositions of Examples 1 to 3 and Comparative Examples 4 to 5

[0155]

[0156] As can be seen from Table 6, Examples 1 to 3 and Comparative Examples 4 to 5 change the mass ratio of high molecular weight polydimethylsiloxane to low molecular weight polydimethylsiloxane, and the test results of the formed paint film performance show obvious differences. Among them, the paint films in Examples 1 to 3 have better performance, the scratch resistance, water resistance, alkali resistance, scrub resistance and workability of the paint films are all good, and the paint film appearance effect is good, with better velvet art paint effect. That is, within the scope of Examples 1 to 3, on the basis of ensuring the workability and paint film effect, its basic performance meets the relevant test standards, and the scratch resistance and black mark resistance effects are excellent. Comparative Examples 1 to 3 show that the color difference values ​​of the three are also different. In Comparative Example 4, a higher (1:1.5) mass ratio of high molecular weight polydimethylsiloxane to low molecular weight polydimethylsiloxane is used, and the black mark resistance effect is reduced compared with Examples 1 to 3, and the construction feel is not as good as other solutions. At the same time, a higher ratio may also cause shrinkage holes in the paint film. In Comparative Example 5, a relatively low (1:9) mass ratio of high molecular weight polydimethylsiloxane to low molecular weight polydimethylsiloxane was used, and the paint film formed showed the undesirable phenomenon of orange peel, and the velvet effect was reduced. In addition, the washability, water resistance and alkali resistance also decreased.

[0157] Combining Examples 1 to 3 and Comparative Examples 4 to 5, it can be seen that by adjusting the mass ratio of high molecular weight polydimethylsiloxane to low molecular weight polydimethylsiloxane, the scratch resistance can be further improved, and the appearance effect, alkali resistance, water resistance and other properties of the paint film can be adjusted at the same time. When the mass ratio is within the range of 1: (2 to 8), the scratch resistance and construction effect are better, and the paint film has no undesirable phenomena such as orange peel and shrinkage.

[0158] Table 7 Comparison of performance test results of coating compositions of Example 1 and Comparative Examples 6-7

[0159]

[0160] It can be seen from Table 7 that the particle size and amount of sand flour have an impact on the appearance effect and construction performance. In Comparative Example 2, the average particle size of the sand flour is increased to 30 μm, and the increase in particle size leads to a rough appearance of the formed paint film; in Comparative Example 3, the amount of sand flour is increased, which also leads to a rough appearance of the paint film, and the paint film effect after construction is also rough, which is not conducive to the presentation of the velvet effect.

[0161] Figure 1 This is a picture of scratches and black marks on the surface of commercially available velvet art paint; Figure 1 a is the scratch image, Figure 1 b is the black mark image. Figure 2 The plastic scratch resistance of the paint film formed by the coating composition of Example 1 of the present invention and the paint films formed by the commercially available artistic paints of Comparative Examples 8 to 9. Figure 3 The resistance to stainless steel and black rubber scratches of the paint film formed by the coating composition of Example 1 of the present invention and the paint film formed by the commercially available art paint of Comparative Examples 8 to 9. In order to avoid the influence of the angle problem on the photographic effect, Figure 2 The left and right pictures in the middle show the locations of the paint films. Figures 1 to 3 It can be seen that the scratch-resistant agent of the present invention can improve the scratch resistance of the coating composition. The coating composition, as a velvet effect artistic paint, not only ensures the pearlescent effect, but also has excellent scratch resistance and black mark resistance.

[0162] The coating composition of the present invention can be applied by the following method to enhance the pearlescent effect:

[0163] The specific steps include:

[0164] S1. The coating composition of the second aspect of the present invention is diluted to the desired coating viscosity and stirred evenly;

[0165] S2. coating the wall surface with the coating composition after stirring evenly in step S1, comprising:

[0166] S21. Use an interior wall roller to evenly roll the paint in different directions with short strokes;

[0167] S22. Use a special-shaped washboard to rub the paint in a figure-eight pattern to create a velvet texture;

[0168] S23. After all the coating is completed, use the shaped scrubbing board again to rub the paint film in an eight-shaped manner before the surface is dry;

[0169] S3. Drying, and post-treatment as needed to form a velvet effect paint film (pearlescent effect paint film).

[0170] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A scratch resistant agent, characterized in that: The invention comprises sand flour, high molecular weight polydimethylsiloxane and low molecular weight polydimethylsiloxane; the weight average molecular weight of the high molecular weight polydimethylsiloxane is greater than 100,000; the weight average molecular weight of the low molecular weight polydimethylsiloxane is less than or equal to 4,000.

2. The scratch resistant agent according to claim 1, characterized in that The mass ratio of the high molecular weight polydimethylsiloxane to the low molecular weight polydimethylsiloxane is 1:(2-8).

3. The scratch resistant agent according to claim 1, characterized in that: The particle size of the sand flour is 3 to 20 μm.

4. The scratch resistant agent according to any one of claims 1 to 3, characterized in that: The invention comprises the following components by weight: 1 to 4 parts of sand flour, 0.5 to 1 part of high molecular weight polydimethylsiloxane and 1 to 5 parts of low molecular weight polydimethylsiloxane.

5. A coating composition, characterized in that: The invention comprises the anti-scratch agent according to any one of claims 1 to 4.

6. The coating composition according to claim 5, characterized in that Calculated by mass, it includes the following components: 10-40 parts of resin emulsion, 2.5-10 parts of scratch resistant agent, 0-65 parts of auxiliary agent.

7. The coating composition according to claim 6, characterized in that The auxiliary agent includes at least one of pearlescent pigment, talc, film-forming auxiliary agent, pH regulator, thickener, wetting agent, dispersant, defoamer, mildewproof agent, bactericide, preservative and antifreeze agent; And / or, the resin emulsion comprises pure acrylic emulsion.

8. A method for preparing the coating composition according to any one of claims 5 to 7, characterized in that: The steps include: The scratch resistant agent is mixed with other components to obtain the coating composition.

9. Use of the scratch-resistant agent according to any one of claims 1 to 4 or the coating composition according to any one of claims 5 to 7 in preparing a paint film.

10. A painted product, characterized in that: It comprises a substrate and a paint film; the paint film is obtained by coating or spraying the coating composition according to any one of claims 5 to 7.

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