Leather polishing top finishing agent as well as preparation method and application thereof

Abstract

The invention provides a leather polishing top finishing agent as well as a preparation method and application thereof. The finishing agent comprises 30-40 parts of water; 1-3 parts of silicon dioxide matting powder; 20 to 30 parts of waterborne polyurethane resin; 20 to 30 parts of a wax emulsion; 1-2 parts of a dispersant; 1-3 parts of a suspension stabilizer; 0.2 to 1 part of a preservative; 0-2 parts of a wetting agent; 0-1 part of a hand feeling agent; 0-1 part of a pH value regulator; 0 to 0.5 part of a defoaming agent; the silicon dioxide matting powder is fumed silica; the main components of the wax emulsion are palm wax and high-density polyethylene wax. The wax emulsion used by the invention has the characteristics of easiness in polishing and transparency; the used silicon dioxide matting powder not only can further improve the glossiness after milling, but also has a certain effect on the overall stability of the product. The finishing agent is suitable for top coating of embossed leather, an excellent top brightening effect can be achieved, and the attractiveness of finished leather is improved.

Description

Technical Field

[0001] The invention belongs to the field of leather finishing materials, and in particular relates to a leather polishing top finishing agent and a preparation method and application thereof. Background Art

[0002] One of the main links in leather processing is to design and produce various styles of patterns and textures, which is also the uniqueness of leather products. With the development of the leather industry and the improvement of people's aesthetic level, leather finishing technology with unique style has been greatly developed, among which tumbled top finishing is an important one. The reagent materials used for tumbled top finishing (referred to as tumbled top finishing agent) are mostly used in embossed leather. The embossed pattern of leather products is a "litchi" pattern with a concave and convex surface, that is, the embossed pattern has the characteristics of an uneven surface.

[0003] The leather tumbling finishing agent is usually applied to the top layer of embossed leather by spraying. After it is completely dried, it enters the tumbling drum. The raised top of the leather surface pattern is rubbed and polished to become brighter through tumbling, creating a gloss difference with the sunken bottom of the pattern to obtain a glossy top effect, that is, the effect of uneven gloss on the leather surface.

[0004] For example, a Chinese patent document with a publication number of CN 205710783 U discloses a high-performance tumbled bright-bright cowhide leather. The cowhide leather described in the patent document is composed of, from the inside to the surface, a cortical germ layer, a base pulp layer, a surface pulp layer, a protective top pulp layer, and a high-brightness top pulp layer. The cowhide leather forms an irregular raised texture as a whole, with high points formed at the top of the texture and dark spots formed at the bottom of the texture. The thickness of the high-brightness top pulp layer at the high points is less than the thickness at the dark spots. The surface of the surface pulp layer is a regular texture surface. The protective top pulp layer penetrates into the texture surface and is tightly connected to the texture surface. The high-brightness top pulp layer covers the outermost surface. The above patent document technology uses a two-layer top pulp layer to protect the top pulp layer to maintain conventional physical properties, and the high-brightness top pulp layer coated thereon can achieve a bright spot effect after a short period of tumbling. However, the tumbled bright-brightness top leather adopts a double-layer spraying technology, which increases the cumbersomeness of the coating process. Most of the polishing top finishing agents in the prior art are made of resin and polishing wax. In order to obtain a better polishing effect, the proportion of wax components in the formula is relatively large, and the proportion of resin that dominates the physical properties is relatively small, which is easy to affect the physical properties of the finished leather. Summary of the invention

[0005] In view of the above problems of the prior art, the present invention provides a leather polishing top coating agent and its preparation method and application. The present invention develops a coating agent with excellent physical properties, which can be directly used for leather polishing top coating and has a significant polishing effect.

[0006] The present invention provides a leather polishing top finishing agent, comprising the following components in parts by weight:

[0007] 30-40 parts of water; 1-3 parts of silica matting powder; 20-30 parts of waterborne polyurethane resin; 20-30 parts of wax emulsion; 1-2 parts of dispersant; 1-3 parts of suspension stabilizer; 0.2-1 parts of preservative; 0-2 parts of wetting agent; 0-1 parts of feel agent; 0-1 parts of pH value adjuster; 0-0.5 parts of defoaming agent;

[0008] The silicon dioxide matting powder is fumed silicon dioxide; the main components of the wax emulsion are palm wax and high-density polyethylene wax.

[0009] In an embodiment of the present invention, the wax emulsion is prepared by emulsifying palm wax and high-density polyethylene wax in the presence of a surfactant; the surfactant is at least two of polyoxyethylene ethers, spans, stearic acid and multifunctional amine additives.

[0010] In an embodiment of the present invention, the waterborne polyurethane resin is a waterborne aliphatic polyester polyurethane emulsion; the suspension stabilizer is one or more of an inorganic anti-settling agent, an acrylic agent, and a polyurethane associative agent.

[0011] In an embodiment of the present invention, the wetting agent is 0.5 to 2 parts; the defoaming agent is 0.1 to 0.5 parts.

[0012] In an embodiment of the present invention, the dispersant is a polyacrylic acid dispersant; the wetting agent is a polysiloxane-polyether copolymer; and the defoaming agent is a silicone defoaming agent.

[0013] In an embodiment of the present invention, the pH adjuster is one or more of ammonia water, triethylamine, triethanolamine and 2-amino-2-methyl-1-propanol.

[0014] In an embodiment of the present invention, the preservative is one or more of preservative MIT, preservative CMIT and preservative BIT.

[0015] The present invention provides a method for preparing the leather polishing top finishing agent as described above, comprising the following steps:

[0016] Mixing water, an optional wetting agent, a dispersant, and a silica matting powder in parts by mass to obtain a first mixture;

[0017] Mixing the first mixture, an optional defoamer, an optional feel agent, a preservative, an aqueous polyurethane resin, and a wax emulsion to obtain a second mixture;

[0018] The second mixture, an optional pH value adjuster and a suspension stabilizer are mixed and filtered to obtain the leather polishing top finishing agent.

[0019] In an embodiment of the present invention, the pH value adjusting agent adjusts the pH to 8.0-9.0; the room temperature viscosity of the mixture before filtration is 400-1000 mPa.s.

[0020] The invention provides an embossed leather product, which is made by spraying the embossed leather blank with the leather tumbling and polishing top coating agent as mentioned above, and then tumbling and softening the leather blank.

[0021] Compared with the prior art, the composition formula of the leather tumbled top finishing agent provided by the present invention includes: 30-40 parts of water; 1-3 parts of silica matting powder; 20-30 parts of waterborne polyurethane resin; 20-30 parts of wax emulsion; 1-2 parts; 1-3 parts of suspension stabilizer; 0.2-1 parts of preservative; 0-2 parts of wetting agent; 0-1 part of hand feeling agent; 0-1 part of pH value regulator; 0-0.5 parts of defoaming agent; the silica matting powder is fumed silica; the main components of the wax emulsion are palm wax and high-density polyethylene wax. In the present invention, the wax emulsion used has the characteristics of easy polishing and translucency; the silica matting powder used can not only further improve the gloss after tumbling, but also has a certain effect on the overall stability of the product. The leather tumbled top finishing agent described in the present invention is suitable for the top coating of embossed leather, which can obtain excellent top gloss effect and increase the aesthetic performance of the finished leather. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a photo of the leather effect after the finishing agent of Example 1 of the present invention is applied;

[0023] Figure 2 This is a photo of the leather effect after the finishing agent 1 of the control group of the present invention is applied;

[0024] Figure 3 This is a photo of the leather effect after the finishing agent 2 of the control group of the present invention is applied. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the technical scheme of the present invention is now described in detail below in conjunction with specific embodiments. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0026] The present invention provides a leather polishing top finishing agent, comprising the following components in parts by weight:

[0027] 30-40 parts of water; 1-3 parts of silica matting powder; 20-30 parts of water-based polyurethane resin; 20-30 parts of wax emulsion; 1-2 parts of dispersant; 1-3 parts of suspension stabilizer; 0.2-1 parts of preservative; 0-2 parts of wetting agent; 0-1 parts of feel agent; 0-1 parts of pH value adjuster; 0-0.5 parts of defoaming agent; the silica matting powder is fumed silica; the main components of the wax emulsion are palm wax and high-density polyethylene wax.

[0028] The invention develops a finishing agent with excellent physical properties, which can be directly used for leather polishing, is simple to apply and has a significant polishing effect.

[0029] The finishing agent described in the embodiment of the present invention is a leather polish finishing agent and a leather polish brightener, and its formula components mainly include: 20 to 30 parts by mass of waterborne polyurethane resin and 20 to 30 parts by mass of wax emulsion. The wax emulsion is the main material for the polishing effect, and accounts for a large proportion, and the parts by mass can be 20 parts, 22 parts, 25 parts, 30 parts, etc.; it is mainly composed of palm wax and high-density polyethylene wax, the former has good polishing properties, and the latter has high hardness and good brightness. The combination of the two is easy to polish and has a transparent feeling. The wax in conventional finishing agents is to improve the feel or enhance properties such as wear, and generally needs to avoid polishing.

[0030] Palm wax is a natural plant wax extracted from the buds and leaves of palm trees, with a density of about 0.9 to 1 g / cm 3 . Polyethylene wax is a low molecular weight polyethylene homopolymer or copolymer widely used in coatings; the density of the high-density polyethylene wax is generally 0.93 to 0.98 g / cm3. In some embodiments, the wax emulsion can be homemade, and is prepared by emulsifying the main components of palm wax and high-density polyethylene wax in the presence of a surfactant; the surfactant preferably includes at least two of polyoxyethylene ethers (such as surfactant 1308), stearic acid, Span (preferably Span 60 and / or Span 80) and multifunctional amine additives (AMP95), and is emulsified in a high-pressure reactor. In some other embodiments, the wax emulsion is a commercially available product, such as WAX5171 (Sichuan Dawe Technology Co., Ltd.).

[0031] The waterborne polyurethane resin has good physical properties, and is preferably a waterborne aliphatic polyester polyurethane emulsion; its weight parts can be 20 parts, 25 parts, 26 parts, 30 parts, etc. The embodiment of the present invention can use waterborne polyurethane resin RU539 produced by Sichuan Dawei Technology Co., Ltd. and other products, and its elongation can be 400-600%, and the 100% elongation modulus is 4-5N / mm 2 .

[0032] Moreover, the leather polishing top finishing agent described in the embodiment of the present invention includes, by weight, 30 to 40 parts of water (generally deionized water); 1 to 3 parts of silica matting powder; 1 to 2 parts of dispersant; 1 to 3 parts of suspension stabilizer; 0.2 to 1 part of preservative, and the like.

[0033] The silica matting powder is conventional fumed silica with a particle size of 5-10 μm. It is a material with good transparency, fluffy and a large number of cavities. It will collapse under the friction of external force and make the coating surface smooth, thereby further improving the gloss after softening. At the same time, it can also play the role of some suspension stabilizer, which is beneficial to the overall stability of the product. Because the finished product has a natural gloss, the amount of the silica matting powder should not be too large.

[0034] The suspension stabilizer includes one or more combinations of conventional commercial inorganic anti-settling agents, acrylic acid and polyurethane associative agents; inorganic anti-settling agents are mainly silicates, such as aluminum magnesium silicate, and polyurethane associative agents are usually some polyurethane substances with thickening effects. Commercially available polyurethane products that have thickening effects can be used, and the main performance is basically not affected. The suspension stabilizer can be a conventional commercial material that is effective for thickening under shear viscosity in the system.

[0035] The preservative is a conventional commercially available industrial preservative product, including one or more of the preservative MIT (methylisothiazolinone), the preservative CMIT (5-chloro-2-methyl-4-isothiazolin-3-one) and the preservative BIT (the main active ingredient of which is 1,2-benzisothiazolin-3-one).

[0036] The embodiment of the present invention further comprises one or more of a wetting agent, a hand feeling agent, a pH value adjusting agent and a defoaming agent; further, the wetting agent is 0.5 to 2 parts; the defoaming agent is 0.1 to 0.5 parts.

[0037] Preferably, the dispersant is a polyacrylic acid dispersant, such as polyacrylic acid carboxylate type, which can disperse inorganic matting powder; the wetting agent is a polysiloxane-polyether copolymer, and the molecular weight is about 10000. The defoamer is preferably an organosilicon defoamer, which can be a conventional commercial product; the pH adjuster includes one or more of conventional ammonia water, triethylamine, triethanolamine and 2-amino-2-methyl-1-propanol.

[0038] Preferably, the hand feeling agent used in the embodiment of the present invention is an ultra-high molecular weight silicone dispersion. This additive can be used in this product to improve the smoothness of the coating film and reduce the difficulty of polishing, thereby making the product of the present invention a leather brightener that can improve the leather feel. Specifically, DOWSIL TM FBL-3289 hand feeling agent.

[0039] Accordingly, the embodiment of the present invention provides a method for preparing the leather polishing top finishing agent as described above, comprising the following steps:

[0040] Mixing water, an optional wetting agent, a dispersant, and a silica matting powder in parts by mass to obtain a first mixture;

[0041] Mixing the first mixture, an optional defoamer, an optional feel agent, a preservative, an aqueous polyurethane resin, and a wax emulsion to obtain a second mixture;

[0042] The second mixture, an optional pH value adjuster and a suspension stabilizer are mixed and filtered to obtain the leather polishing top finishing agent.

[0043] In some embodiments of the present invention, the preparation method is as follows:

[0044] Step 1: Add deionized water, wetting agent and dispersant to the dispersion kettle in sequence, start stirring, the stirring speed is preferably 200-300r / min, slowly add silica matting powder after dispersing for 10-20min, increase the speed to 1000-1500r / min, and stir for 30-60min until the mixture is evenly mixed and there is no obvious granularity;

[0045] Step 2: Add defoamer, reduce the speed to 200-300r / min, and wait for the bubbles on the surface to disappear;

[0046] Step 3: Add waterborne polyurethane resin, wax emulsion and optional hand feeling agent to the mixed solution of step 2 in sequence, adjust the stirring speed to 400-600r / min, and stir evenly;

[0047] Step 4: Add the pH adjuster pre-diluted to 10% to the mixed solution in step 3 to adjust the pH value to 8.0-9.0;

[0048] Step 5: slowly add the suspension stabilizer to the mixed solution of step 4 until the desired viscosity is reached, such as 1500-2500 mPa.s (2#, 6R, rotational viscometer test) at room temperature, and filter through a 200-mesh filter to obtain a finished product with a solid content of about 16-20%.

[0049] The present invention also provides an embossed leather product, which is made by using the leather tumbling and polishing top coating agent as mentioned above to perform top coating spraying on the embossed leather blank, and then tumbling and softening it.

[0050] The preparation of the embossed leather product according to the embodiment of the present invention comprises:

[0051] First, the leather is processed in a conventional way: the sofa leather is softened, rolled and polished;

[0052] Then, roll the bottom slurry once, isolate, emboss, soften for 6-12 hours until the pattern is full, and spray the surface slurry twice; then spray the finishing agent described in the embodiment of the present invention with a spray amount of 1.6g / sf2, let it stand for about 2 hours after conventional drying, and soften for 2-4 hours; it can be tested after being placed for 24 hours.

[0053] According to the test, the leather tumbling brightener described in the embodiment of the present invention is applied to embossed leather. After tumbling, the gloss difference between the top of the pattern and the bottom of the groove is obvious, the brightening effect is remarkable, and there is no graying or whitening, and the hand feel is natural and comfortable.

[0054] In order to further understand the present invention, the present invention is described in detail in conjunction with the following examples, and the protection scope of the present invention is not limited by the following examples. In the examples, all the original reagents and materials can be purchased commercially, and the wetting agent and dispersant are all produced by the company. The specific brand is Davino 5711 wetting agent (polysiloxane-polyether copolymer, molecular weight of about 10,000), and the dispersant is polyacrylic acid carboxylate type (molecular weight of about 10,000-20,000, effective content 30-40%); the preservative is Dow BIT-20; the hand feeling agent is Dow DOWSIL TM FBL-3289. In addition, the experimental methods without specific experimental conditions are conventional methods and conditions well known in the art.

[0055] Example 1

[0056] S1: Add 40 parts of deionized water, 2 parts of wetting agent and 2 parts of dispersant into the dispersion kettle in sequence, start stirring at a speed of 200r / min, slowly add 2.5 parts of silica matting powder after dispersing for 20 minutes, increase the speed to 1000r / min, and stir for 30 minutes until the mixture is evenly mixed and there is no obvious granularity;

[0057] S2: Add 0.5 parts of silicone defoamer, reduce the speed to 200r / min, and eliminate the bubbles on the surface;

[0058] S3: add 30 parts of waterborne polyurethane resin, 20 parts of wax emulsion, 0.5 parts of hand feeling agent and 0.2 parts of preservative to the mixed solution of S2 in sequence, adjust the stirring speed to 400r / min, and stir evenly. The waterborne polyurethane resin and wax emulsion used here are RU539 and WAX5171, products of Sichuan Dawei Technology Co., Ltd. respectively;

[0059] S4: Add AMP95 amine neutralizer pre-diluted to 10% to the mixed solution of S3 and adjust the pH value to 8.0-8.5;

[0060] S5: Slowly add the inorganic anti-settling agent aluminum magnesium silicate into the mixed solution of S4 until the viscosity reaches 1500-1800 map.s (2#, 6R, rotational viscometer test), and filter through 200 mesh to obtain the finished product with a solid content of 20%.

[0061] Example 2

[0062] S1: Add 35 parts of deionized water, 1 part of wetting agent and 1 part of dispersant into the dispersion kettle in sequence, start stirring at a speed of 200r / min, slowly add 1.5 parts of silica matting powder after dispersing for 20 minutes, increase the speed to 1000r / min, and stir for 60 minutes until the mixture is evenly mixed and there is no obvious granularity;

[0063] S2: Add 0.3 parts of silicone defoamer, reduce the speed to 200r / min, and eliminate the surface bubbles;

[0064] S3: add 25 parts of waterborne polyurethane resin, 25 parts of wax emulsion, 0.5 parts of hand feeling agent and 0.3 parts of preservative to the mixed solution of S2 in sequence, adjust the stirring speed to 400r / min, and stir evenly. The waterborne polyurethane resin and wax emulsion used here are products RU539 and WAX5171 respectively;

[0065] S4: Slowly add a commercially available conventional polyurethane thickener into the mixed solution of S3 until the viscosity reaches 1800-2200 map.s (2#, 6R, rotational viscometer test), and filter through 200 mesh to obtain a finished product with a solid content of 18%.

[0066] Example 3

[0067] S1: Add 30 parts of deionized water, 0.5 parts of wetting agent and 1 part of dispersant into the dispersion kettle in sequence, start stirring at a speed of 200r / min, slowly add 1 part of silica matting powder after dispersing for 20 minutes, increase the speed to 1000r / min, and stir for 60 minutes until the mixture is evenly mixed and there is no obvious granularity;

[0068] S2: Add 0.2 parts of silicone defoamer, reduce the speed to 200r / min, and eliminate the surface bubbles;

[0069] S3: add 20 parts of waterborne polyurethane resin, 30 parts of wax emulsion, 0.5 parts of hand feeling agent and 0.6 parts of preservative to the mixed solution of S2 in sequence, adjust the stirring speed to 500r / min, and stir evenly. The waterborne polyurethane resin and wax emulsion used here are products RU539 and WAX5171 respectively;

[0070] S4: Add the pre-diluted ammonia water dropwise to the mixed solution of S3 and adjust the pH value to 8.5-9.0;

[0071] S5: Slowly add the acrylic thickener Dow ASE60 to the mixed solution of S4 until the viscosity reaches 2200-2500 map.s (2#, 6R, rotational viscometer test), and filter through 200 mesh to obtain a finished product with a solid content of 16%.

[0072] Example 4

[0073] The polished top finishing agent prepared in Example 1, a commercially available conventional matte finishing agent (the product M7228 of Sichuan Dawei Technology Co., Ltd. was used in this test, which does not contain wax or inorganic matte powder) and a commercially available finishing agent containing wax and inorganic matte powder (conventional product, refer to Chinese patent CN 102676036A, a water-based matte touch-sensitive varnish and its preparation method) were used as samples and applied in the following steps:

[0074] First, conventional leather processing is performed: the sofa leather blank is softened, roller-filled, and polished, then the bottom slurry is rolled once, isolated, embossed, and softened for 6-12 hours until the pattern is full, sprayed with surface slurry twice, and then sprayed with the finishing agent of the present invention (Example 1), a commercially available conventional matte finishing agent (reference product 1) or a commercially available wax-containing, inorganic matte powder-containing finishing agent (reference product 2) twice, with a spraying amount of 1.6 g / sf2, and then conventionally dried and allowed to stand for about 2 hours, and softened for 2-4 hours until the top is obviously shiny; and detection is performed after being placed for 24 hours.

[0075] The observation results of bright top are as follows: Figures 1 to 3 As shown, Figure 1 This is the effect of the polished top coating agent of Example 1 of the present invention. Figure 2 The effect of conventional matte finishing agents on the market. Figure 3 It is the effect of the commercial wax-containing and inorganic matting powder-containing finishing agent. As can be seen from the figure, the present invention achieves a clear bright top, natural luster, and beautiful appearance, which is obviously better than the commercial wax-containing and inorganic matting powder-containing finishing agent. The commercial conventional matting finishing agent has no obvious bright top effect after application.

[0076] Each group of samples was tested using a gloss meter, a wipe tester, and an abrasion tester. The results were as follows (level 5 is the best result, level 1 is the worst result), and the touch of each group was recorded. The test results are shown in Table 1 below:

[0077] Table 1 Physical properties of each group

[0078]

[0079]

[0080] The physical properties of Example 2 and Example 3, such as dry rubbing, wet rubbing and abrasion, are similar to those of Example 1.

[0081] It can be seen from the above embodiments that the ingredient formula of the leather polishing top finishing agent provided by the present invention includes: 30-40 parts of water; 1-3 parts of silica matting powder; 20-30 parts of waterborne polyurethane resin; 20-30 parts of wax emulsion; 1-2 parts; 1-3 parts of suspension stabilizer; 0.2-1 parts of preservative; 0-2 parts of wetting agent; 0-1 parts of hand feeling agent; 0-1 parts of pH value adjuster; 0-0.5 parts of defoaming agent; the silica matting powder is fumed silica; the main components of the wax emulsion are palm wax and high-density polyethylene wax. In the present invention, the wax emulsion used has the characteristics of easy polishing and translucency; the silica matting powder used can not only further enhance the gloss after softening, but also has a certain effect on the overall stability of the product. The leather polishing top finishing agent described in the present invention is suitable for the top coating of embossed leather, which can obtain excellent polishing effect and increase the aesthetic performance of the finished leather.

[0082] The above examples are only used to illustrate the technical features and implementation process of the present invention, rather than to limit the technical solution of the present invention. It should be pointed out that for ordinary technicians in this field, the present invention can still be modified or replaced by equivalents, and modifications or replacements that do not deviate from the principles of the present invention are all covered by the protection of the present invention.

Claims

1. A leather polishing top finishing agent, characterized in that: The composition comprises the following components in parts by weight: 30-40 parts of water; 1-3 parts of silica matting powder; 20-30 parts of waterborne polyurethane resin; 20-30 parts of wax emulsion; 1-2 parts of dispersant; 1-3 parts of suspension stabilizer; 0.2-1 parts of preservatives; 0-2 parts of wetting agents; 0-1 parts of feel agents; 0-1 parts of pH adjusters; 0-0.5 parts of defoaming agents; The silicon dioxide matting powder is fumed silicon dioxide; the main components of the wax emulsion are palm wax and high-density polyethylene wax.

2. The leather polishing top finishing agent according to claim 1, characterized in that: The wax emulsion is prepared by emulsifying palm wax and high-density polyethylene wax in the presence of a surfactant; the surfactant is at least two of polyoxyethylene ethers, spans, stearic acid and multifunctional amine additives.

3. The leather polishing top finishing agent according to claim 1, characterized in that: The waterborne polyurethane resin is a waterborne aliphatic polyester polyurethane emulsion; the suspension stabilizer is one or more of an inorganic anti-settling agent, an acrylic acid and a polyurethane associative agent.

4. The leather polishing top finishing agent according to any one of claims 1 to 3, characterized in that: The wetting agent is 0.5 to 2 parts; the defoaming agent is 0.1 to 0.5 parts.

5. The leather polishing top finishing agent according to claim 4, characterized in that: The dispersant is a polyacrylic acid dispersant; the wetting agent is a polysiloxane-polyether copolymer; and the defoaming agent is an organosilicon defoaming agent.

6. The leather polishing top finishing agent according to any one of claims 1 to 3, characterized in that: The pH regulator is one or more of ammonia water, triethylamine, triethanolamine and 2-amino-2-methyl-1-propanol.

7. The leather polishing top finishing agent according to any one of claims 1 to 3, characterized in that: The preservative is one or more of preservative MIT, preservative CMIT and preservative BIT.

8. A method for preparing a leather polishing top finishing agent as claimed in any one of claims 1 to 7, comprising the following steps: Mixing water, an optional wetting agent, a dispersant, and a silica matting powder in parts by mass to obtain a first mixture; Mixing the first mixture, an optional defoamer, an optional feel agent, a preservative, an aqueous polyurethane resin, and a wax emulsion to obtain a second mixture; The second mixture, an optional pH value adjuster and a suspension stabilizer are mixed and filtered to obtain the leather polishing top finishing agent.

9. The preparation method according to claim 8, characterized in that: The pH value regulator adjusts the pH to 8.0-9.0; the room temperature viscosity of the mixture before filtration is 400-1000 mPa.s.

10. An embossed leather product, characterized in that: The leather tumbling and polishing top coating agent as described in any one of claims 1 to 7 is used to spray the embossed leather blank with top coating, and then tumbled and softened to make the leather blank.

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