A leather-specific polishing composite wax emulsion and its preparation method

Abstract

This invention belongs to the field of leather auxiliaries, specifically relating to a leather-specific polishing composite wax emulsion and its preparation method. The leather-specific polishing composite wax emulsion comprises the following raw materials in parts by weight: 20-25 parts intermediate wax emulsion, 30-35 parts synthetic emulsified oil, 3-6 parts organosilicon hand-feel agent, 3-7 parts oxidized polyethylene wax emulsion, 3-7 parts silicone-modified polyurethane emulsion, 0.2-0.4 parts preservative, and 20-30 parts water. This emulsion has a clear luster, a delicate, non-plastic feel, good polishing resistance, and can cover minor leather imperfections, solving the problems of existing products sticking to the polishing roller and easily scratching the leather blank, exhibiting excellent overall performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of leather auxiliaries, and particularly relates to a polishing composite wax emulsion special for leather and a preparation method thereof. BACKGROUND

[0002] The wax emulsion is a very important auxiliary product in the leather finishing process, and is applied to the surface of leather in the form of roll coating or spraying. The wax emulsion can not only bring comfortable touch and exquisite appearance to the leather, but also can cover small defects on the surface, increase the variety of leather, and obviously improve the grade and utilization rate of leather.

[0003] The leather polishing wax emulsion is a functional wax emulsion finishing auxiliary. After being applied to the surface of leather and polished, the wax emulsion can cover small defects and make the leather have a more natural high gloss than resin. The leather product using the auxiliary will show a more and more natural thick and high gloss after long-time use and friction, and has a unique appearance feature.

[0004] At present, the mainstream leather polishing wax emulsion products at home and abroad are composed of hard waxes such as oxidized polyethylene wax and Fischer-Tropsch wax. The finished product has a hard texture and obvious plasticity, and needs a hand feel adjusting auxiliary in the subsequent application process to neutralize the plasticity problem caused by the wax emulsion. In addition, since the hard waxes used are mostly high-melting-point waxes, the melting point is usually above 100℃. Therefore, after the wax emulsion is applied to the surface of the leather and polished and then is treated by the light polishing at the temperature of about 120℃ (which is the common operating condition of tanneries), most of the commercially available polishing wax emulsion products will have obvious roller marks on the light polishing roller, which affects the quality of the finished leather and the application operation convenience.

[0005] Therefore, the technical scheme of the present application is proposed. SUMMARY

[0006] In order to solve the problems in the prior art, the present application provides a kind of polishing composite wax emulsion special for leather, which comprises the following raw materials by weight: intermediate wax emulsion 20-25 parts, synthetic emulsified oil 30-35 parts, organic silicon hand feel agent 3-6 parts, oxidized polyethylene wax emulsion 3-7 parts, silicon modified polyurethane emulsion 3-7 parts, preservative 0.2-0.4 parts and water 20-30 parts.

[0007] Preferably, the polishing composite wax emulsion special for leather comprises the following raw materials by weight: intermediate wax emulsion 22 parts, synthetic emulsified oil 32 parts, organic silicon hand feel agent 4.5 parts, oxidized polyethylene wax emulsion 5 parts, silicon modified polyurethane emulsion 5 parts, preservative 0.3 parts and water 25 parts.

[0008] Preferably, the preparation method of the intermediate wax emulsion comprises the following steps: (1) Mix candelilla wax and emulsifier, heat to melt and stir to obtain the first mixture; (2) Add a neutralizing-emulsifying agent to the first mixture and continue stirring to obtain a second mixture; (3) Add hot water to the second mixture and continue stirring to obtain the third mixture; (4) Add preservatives to the third mixture and continue stirring to obtain the intermediate wax emulsion.

[0009] Preferably, the preparation method of the intermediate wax emulsion includes the following steps: (1) Mix 17-21 parts by weight of candelilla wax and 4-8 parts by weight of emulsifier, heat to 110-115℃ to melt, then stir and mix evenly and reduce the temperature to 90-95℃ to obtain the first mixture; (2) Add 1-3 parts by weight of neutralizing-emulsifying agent to the first mixture, keep warm at 90-95℃ and continue stirring for 10-15 minutes to obtain the second mixture; (3) Add 72-78 parts by weight of hot water above 95°C to the second mixture and continue stirring. After the addition is complete, keep warm and emulsify for 20-30 minutes, and then cool down to obtain the third mixture; (4) After the temperature is ≤45℃, add 1.3-3.5 parts by weight of the preservative aqueous solution to the third mixture and continue mixing and stirring for 10-15 minutes; (5) Sampling and testing. After the test results meet the standards, the material is filtered out to obtain the intermediate wax emulsion.

[0010] Preferably, the method for preparing the synthetic emulsified oil includes the following steps: (1) Mix 26# white oil, modified vegetable oil, synthetic oil, and fatty alcohol polyoxyethylene ether emulsifier, heat and stir to obtain a fourth mixture; (2) Add hot water to the fourth mixture and continue stirring to obtain the fifth mixture; (3) Add preservatives to the fifth mixture and continue stirring to obtain the synthetic emulsified oil.

[0011] Preferably, the method for preparing the synthetic emulsified oil includes the following steps: (1) Mix 2-3 parts by weight of 26# white oil, 10-12 parts by weight of modified vegetable oil, 5-8 parts by weight of synthetic oil and 2-3 parts by weight of fatty alcohol polyoxyethylene ether emulsifier, heat to 50-55℃ and stir for 10-15 minutes to obtain the fourth mixture. (2) Add 73-77 parts by weight of hot water to the fourth mixture and continue stirring. After the addition is complete, keep warm and emulsify for 20-30 minutes, and then cool down to obtain the fifth mixture; (3) After the temperature is ≤45℃, add 1.3-3.5 parts by weight of the preservative aqueous solution to the fifth mixture and continue mixing and stirring for 10-15 minutes; (4) Sampling and testing. After the test results meet the standards, the material is filtered out to obtain the synthetic emulsified oil.

[0012] Based on the same technical concept, the present invention further provides a method for preparing a leather-specific polishing composite wax emulsion, the preparation method comprising the following steps: (1) Mix the intermediate wax emulsion and water and stir to obtain the first premix; (2) Synthetic emulsified oil, organosilicon feel agent, oxidized polyethylene wax emulsion and silicone-modified polyurethane emulsion are added sequentially to the first premixed liquid and stirred evenly to obtain the second premixed liquid; (3) Add preservative to the second premixed liquid and continue stirring to obtain the leather-specific polishing composite wax emulsion.

[0013] Preferably, the preparation method includes the following steps: (1) Mix the intermediate wax emulsion and water and stir to obtain the first premix; (2) Add synthetic emulsified oil, organosilicon feel agent, oxidized polyethylene wax emulsion and silicone-modified polyurethane emulsion to the first premix in sequence, stir for 30-40 min until the system is uniform, and obtain the second premix. (3) Add preservative to the second premix and continue stirring for 10-15 minutes to mix thoroughly; (4) Sampling and testing; after the test results meet the standards, the material is filtered and discharged. (5) Finally, the product is bottled and packaged in sequence. After the finished product passes inspection, it is put into storage to obtain the leather-specific polishing composite wax emulsion.

[0014] The beneficial effects of this invention are as follows: 1. Excellent gloss performance: The intermediate wax emulsion with candelilla wax as the core, combined with high-density oxidized polyethylene wax emulsion, not only ensures strong polishing and coverage of minor defects, but also makes the leather gloss transparent and natural after polishing. It effectively neutralizes the resin gloss brought by synthetic hard wax and resin, avoiding a harsh gloss texture.

[0015] 2. Optimization of touch and plasticity: The synergistic effect of the silicone feel agent and the silicone-modified polyurethane emulsion not only reduces the plasticity of the system, but also gives the leather a delicate and smooth comfortable touch, while improving the smoothness and polishing resistance, solving the problem of the dry and hard feel of existing products.

[0016] 3. Solving core application pain points: The special synthetic emulsified oil fundamentally overcomes the problem of sticking to the roller during calendering. Its low melting point characteristics form a lubricating interface during high-temperature calendering, promoting separation from the roller. At the same time, through the compounding of mineral oil and modified vegetable oil, it avoids the greasy or dry feeling of single oils, and lubricates the contact surface between the leather blank and the hard wax particles, preventing the leather blank from being scratched during the polishing process.

[0017] 4. Outstanding craftsmanship and practicality: The components have strong synergy, the preparation process is simple and controllable, and no complex equipment is required; the overall performance of the finished product is superior to similar products on the market, which can significantly improve the grade and utilization rate of leather, and is suitable for various leather coating and polishing scenarios, with high application value. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0019] Example 1 This invention provides a method for preparing a leather-specific polishing composite wax emulsion, the preparation method comprising the following steps: (I) Preparation of intermediate wax emulsion (I-1) Clean the emulsification kettle, mix 17kg of small candelilla wax (purchased from Guangzhou Changde New Materials, German KAHLWAX 2039L CANDELILLA), 3kg of fatty alcohol polyoxyethylene ether O-10 (purchased from Jiangsu Haian Petrochemical) and 1kg of fatty acid polyoxyethylene ester A-103 (purchased from Nantong Chenrun Chemical), heat to 110℃ to melt, then stir and mix evenly and reduce the temperature to 90℃ to obtain the first mixture; (I-2) Add 1 kg of triethanolamine (neutralizing-emulsifying agent) to the first mixture, keep it at 90°C and continue stirring for 10 min to obtain the second mixture; (I-3) Slowly add 72 kg of hot water above 95°C to the second mixture and continue stirring. After the mixture turns white and thickens, increase the speed and quickly add the remaining hot water. Keep it warm and emulsify for 20 minutes, then turn on the cooling water to cool it down and then cool it down to obtain the third mixture. (I-4) After the temperature is ≤45℃, add 1.3kg of preservative aqueous solution (preservative is BIT-20, about 0.3kg; water about 1kg) to the third mixture and continue mixing and stirring for 10min; (I-5) Sampling and testing were performed. After the pH and solid content met the standards, the material was filtered out to obtain the intermediate wax emulsion.

[0020] (II) Preparation of synthetic emulsified oil (II-1) Add 2 kg of 26# white oil, 10 kg of modified vegetable oil (Dawei product ZJT319), 5 kg of synthetic oil (Dawei product ZJT321), and 2 kg of fatty alcohol polyoxyethylene ether emulsifier to an emulsification kettle and mix. Heat to 50°C and stir for 10 min to obtain the fourth mixture. (II-2) Slowly add 73 kg of hot water to the fourth mixture. After the mixture turns white and thickens, increase the speed and quickly add the remaining hot water. Keep it warm and emulsify for 20 minutes, then turn on the cooling water to cool it down and then cool it down to obtain the fifth mixture. (II-3) After the temperature is ≤45℃, add 1.3kg of preservative aqueous solution (preservative is BIT-20, about 0.3kg; water about 1kg) to the fifth mixture and continue mixing and stirring for 10min; (II-4) Sampling and testing were performed. After the pH and solid content met the standards, the material was filtered out to obtain the synthetic emulsified oil.

[0021] (III) Preparation of leather-specific polishing composite wax emulsion (III-1) Mix 20 kg of intermediate wax emulsion and 20 kg of water to obtain the first premix; (III-2) Add 30 kg of synthetic emulsified oil, 3 kg of organosilicon feel agent (Dawei product F8231), 3 kg of oxidized polyethylene wax emulsion (Dawei product ZJT729) and 3 kg of silicone-modified polyurethane emulsion (Dawei product Lishi EC-G7760) to the first premix in sequence, and stir for 30 min until the system is homogeneous to obtain the second premix; (III-3) Add 0.2 kg of preservative BIT-20 and 1 kg of water to the second premix and continue stirring for 10 min to mix thoroughly; (III-4) Sampling and testing; after the test results meet the standards, the material is filtered and discharged. (III-5) Finally, the product is bottled and packaged in sequence. After the finished product passes inspection, it is put into storage to obtain the leather-specific polishing composite wax emulsion.

[0022] Example 2

[0023] This invention provides a method for preparing a leather-specific polishing composite wax emulsion, the preparation method comprising the following steps: (I) Preparation of intermediate wax emulsion (I-1) Clean the emulsification kettle, mix 21 kg of candelilla wax (purchased from Guangzhou Changde New Materials, German KAHLWAX 2039L CANDELILLA), 5 kg of fatty alcohol polyoxyethylene ether O-10 (purchased from Jiangsu Haian Petrochemical) and 3 kg of fatty acid polyoxyethylene ester A-103 (purchased from Nantong Chenrun Chemical), heat to 115℃ to melt, then stir and mix evenly and lower the temperature to 95℃ to obtain the first mixture; (I-2) Add 3 kg of triethanolamine (neutralizing-emulsifying agent) to the first mixture, keep warm at 95°C and continue stirring for 15 min to obtain the second mixture; (I-3) Slowly add 78 kg of hot water above 95°C to the second mixture and continue stirring. After the mixture turns white and thickens, increase the speed and quickly add the remaining hot water. Keep it warm and emulsify for 30 minutes, then turn on the cooling water to cool it down and then cool it down to obtain the third mixture. (I-4) After the temperature is ≤45℃, add 3.5kg of preservative aqueous solution (preservative is BIT-20, about 0.5kg; water about 3kg) to the third mixture and continue to mix and stir for 15min; (I-5) Sampling and testing were performed. After the pH and solid content met the standards, the material was filtered out to obtain the intermediate wax emulsion.

[0024] (II) Preparation of synthetic emulsified oil (II-1) Add 3 kg of 26# white oil, 12 kg of modified vegetable oil (Dawei product ZJT319), 8 kg of synthetic oil (Dawei product ZJT321), and 3 kg of fatty alcohol polyoxyethylene ether emulsifier to an emulsification kettle and mix. Heat to 55°C and stir for 15 min to obtain the fourth mixture. (II-2) Slowly add 77 kg of hot water to the fourth mixture. After the mixture turns white and thickens, increase the speed and quickly add the remaining hot water. Keep it warm and emulsify for 30 minutes, then turn on the cooling water to cool it down and then cool it down to obtain the fifth mixture. (II-3) After the temperature is ≤45℃, add 3.5kg of preservative aqueous solution (preservative is BIT-20, about 0.5kg; water about 3kg) to the fifth mixture and continue to mix and stir for 15min; (II-4) Sampling and testing were performed. After the pH and solid content met the standards, the material was filtered out to obtain the synthetic emulsified oil.

[0025] (III) Preparation of leather-specific polishing composite wax emulsion (III-1) Mix 25 kg of intermediate wax emulsion and 25 kg of water to obtain the first premix; (III-2) Add 35 kg of synthetic emulsified oil, 6 kg of organosilicon feel agent (Dawei product F8231), 7 kg of oxidized polyethylene wax emulsion (Dawei product ZJT729) and 7 kg of silicone-modified polyurethane emulsion (Dawei product Lishi EC-G7760) to the first premix in sequence, and stir for 40 min until the system is uniform to obtain the second premix; (III-3) Add 0.4 kg of preservative BIT-20 and 3 kg of water to the second premix and continue stirring for 15 min to mix thoroughly; (III-4) Sampling and testing; after the test results meet the standards, the material is filtered and discharged. (III-5) Finally, the product is bottled and packaged in sequence. After the finished product passes inspection, it is put into storage to obtain the leather-specific polishing composite wax emulsion.

[0026] Example 3

[0027] This invention provides a method for preparing a leather-specific polishing composite wax emulsion, the preparation method comprising the following steps: (I) Preparation of intermediate wax emulsion (I-1) Clean the emulsification kettle, mix 19 kg of candelilla wax (purchased from Guangzhou Changde New Materials, German KAHLWAX 2039L CANDELILLA), 4 kg of fatty alcohol polyoxyethylene ether O-10 (purchased from Jiangsu Haian Petrochemical) and 5 kg of fatty acid polyoxyethylene ester A-103 (purchased from Nantong Chenrun Chemical), heat to 110℃ to melt, then stir and mix evenly and reduce the temperature to 90℃ to obtain the first mixture; (I-2) Add 2 kg of triethanolamine (neutralizing-emulsifying agent) to the first mixture, keep it at 90°C and continue stirring for 10 min to obtain the second mixture; (I-3) Slowly add 75 kg of hot water above 95°C to the second mixture and continue stirring. After the mixture turns white and thickens, increase the speed and quickly add the remaining hot water. Keep it warm and emulsify for 20 minutes, then turn on the cooling water to cool it down and then cool it down to obtain the third mixture. (I-4) After the temperature is ≤45℃, add 2.4kg of preservative aqueous solution (preservative is BIT-20, about 0.4kg; water about 2kg) to the third mixture and continue to mix and stir for 10min; (I-5) Sampling and testing were performed. After the pH and solid content met the standards, the material was filtered out to obtain the intermediate wax emulsion.

[0028] (II) Preparation of synthetic emulsified oil (II-1) Add 2.5 kg of 26# white oil, 11 kg of modified vegetable oil (Dawei product ZJT319), 6 kg of synthetic oil (Dawei product ZJT321), and 2.5 kg of fatty alcohol polyoxyethylene ether emulsifier to an emulsification kettle and mix. Heat to 50°C and stir for 10 min to obtain the fourth mixture. (II-2) Slowly add 75 kg of hot water to the fourth mixture. After the mixture turns white and thickens, increase the speed and quickly add the remaining hot water. Keep it warm and emulsify for 20 minutes, then turn on the cooling water to cool it down and then cool it down to obtain the fifth mixture. (II-3) After the temperature is ≤45℃, add 1.7kg of preservative aqueous solution (preservative is BIT-20, about 0.2kg; water about 1.5kg) to the fifth mixture and continue to mix and stir for 10min; (II-4) Sampling and testing were performed. After the pH and solid content met the standards, the material was filtered out to obtain the synthetic emulsified oil.

[0029] (III) Preparation of leather-specific polishing composite wax emulsion (III-1) Mix 22 kg of intermediate wax emulsion and 22 kg of water to obtain the first premix; (III-2) Add 32 kg of synthetic emulsified oil, 4.5 kg of silicone feel agent (Dawei product F8231), 5 kg of oxidized polyethylene wax emulsion (Dawei product ZJT729) and 5 kg of silicone-modified polyurethane emulsion (Dawei product Lishi EC-G7760) to the first premix in sequence, and stir for 30 min until the system is homogeneous to obtain the second premix; (III-3) Add 0.3 kg of preservative BIT-20 and 3 kg of water to the second premix and continue stirring for 10 minutes to mix thoroughly; (III-4) Sampling and testing; after the test results meet the standards, the material is filtered and discharged. (III-5) Finally, the product is bottled and packaged in sequence. After the finished product passes inspection, it is put into storage to obtain the leather-specific polishing composite wax emulsion.

[0030] To facilitate understanding of the present invention, the research and development process of the present invention will be described using Example 3 as an example: (i) Natural waxes provide polishability and a high gloss. The intermediate wax emulsion prepared using the natural plant hard wax, candelilla wax, not only has polishability similar to synthetic hard waxes, but also has a more transparent and natural gloss after polishing, effectively softening the resinous shine brought by synthetic hard waxes and resin components. Table 1 shows a comparison between the intermediate wax emulsion prepared in Example 3 and two similar commercially available products.

[0031] Table 1

[0032] Note: Gloss is measured by a gloss meter; all performance scores are 1-5, with 5 being the best and 1 being the worst (the same applies below).

[0033] As shown in Table 1, the intermediate wax emulsion prepared using candelilla wax has a significantly stronger gloss and transparency than intermediate wax emulsions prepared using synthetic waxes such as oxidized polyethylene wax and Fischer-Tropsch wax, and also has good polishing performance.

[0034] (II) The role of high-density oxidized polyethylene wax emulsion is to provide a matte finish, polishability, and a certain degree of damage concealment. The oxidized polyethylene wax emulsion (Dawei product ZJT729) added to the above polishing system is a high-density oxidized polyethylene wax emulsion with an average particle size between 0.5 and 1 micrometer. This wax emulsion can provide a certain matte effect in the polishing system, improve the ability to conceal small defects, and at the same time, it has good polishability. The performance after addition is shown in Table 2.

[0035] Table 2

[0036] As shown in Table 2, after adding high-density oxidized polyethylene wax emulsion ZJT729, the matte finish, polishability and gloss of the sample were significantly improved, but the plastic feel became heavier.

[0037] (III) Organosilicon feel agent promotes polishing and adjusts the feel. The organosilicon feel agent (Davifield F8231, a product of Dawei) mainly provides a smooth feel and reduces the resistance during the polishing process. It can also be combined with other additives in the system to adjust the delicate and comfortable touch. The performance after addition is shown in Table 3.

[0038] Table 3

[0039] As shown in Table 3, the addition of Daviefer F8231 hand feel agent significantly improved the plasticity problem and greatly enhanced the polishing performance.

[0040] (iv) Silicone-modified polyurethane resin has the functions of fixing wax, promoting polishing, and protecting the hide blank. The silicone-modified polyurethane resin (Dawei's self-produced product, Dawei Lishi EC-G7760) mainly improves the adhesion of wax emulsion to the hide blank, has a certain film-forming property on the hide blank surface, improves roller sticking problems, and makes the wax less likely to be polished off during the polishing process. It also indirectly protects the hide blank from damage caused by hard wax components during polishing. At the same time, the silicone-modified polyurethane resin also provides a certain degree of slipperiness to promote polishing. The silicone-modified resin aims to promote polishing, increase adhesion, improve roller sticking, and protect the hide blank. The silicone hand feel agent provides a smooth feel, promotes polishing, and also regulates the hand feel; the properties after addition are shown in Table 4.

[0041] Table 4

[0042] As shown in Table 4, the addition of Daweilishi EC-G7760 silicone-modified polyurethane significantly improved the roller sticking problem, reduced the plasticity, and greatly enhanced the polishability and polishing resistance.

[0043] (v) Synthetic emulsified oil solves the problem of sticking to the heat-curing roller. Its main components are 26# white oil + modified vegetable oil + emulsifier. The addition of synthetic emulsified oil can significantly solve the problem of sticking to the heat-curing roller with polishing wax. This is because synthetic emulsified oil has a low melting point and melts completely during the high-temperature heat-curing process. During the heat-curing process, it is preferentially squeezed to the interface between the blank and the heat-curing roller, which plays a role in lubricating the interface between the blank and the roller and promoting separation from the roller.

[0044] (vi) The effect of synthetic emulsified oil in adjusting the feel. Its main components are mineral oil and modified vegetable oil. Conventional animal and vegetable oils have a heavy oily feel, which increases greasiness and frictional resistance when added to the polishing system, hindering polishing operations. Pure mineral oils, on the other hand, have a dry feel and cannot neutralize the dry, plastic feel caused by resins and synthetic waxes in the system. Furthermore, pure mineral oils are difficult to emulsify and stabilize. An emulsified oil system composed of mineral oil and modified vegetable oil effectively solves these problems. Adding this synthetic emulsified oil to the polishing system can significantly adjust the feel of the system without affecting polishing performance, neutralizing the plastic feel and giving the polishing wax product a better, smoother, and more comfortable feel.

[0045] (vii) Synthetic emulsified oil solves the problem of scratching the leather during polishing. Common polishing waxes are composed of hard wax. During polishing, the polishing roller is heated by friction, which crushes and melts the wax particles on the surface of the leather, causing them to redistribute. In the initial stage, the hard wax particles may scratch the leather during friction with the polishing roller. After adding this synthetic emulsified oil, without affecting the polishability, it can effectively lubricate the contact surface between the leather and the hard wax particles, making the leather less prone to scratching during the friction of the polishing roller.

[0046] The performance after adding the feature is shown in Table 5.

[0047] Table 5

[0048] As shown in Table 5, the addition of synthetic emulsified oil to the system significantly improved the tactile feel, polishability, and separation performance.

[0049] The application performance of leather polishing waxes compared with similar products on the market is shown in Table 6.

[0050] Table 6

[0051] As shown in Table 6, compared with similar products on the market, the polishing resistance, tactile feel and separation properties of the product of Example 3 of the present invention are significantly enhanced, and its comprehensive application performance as a leather polishing wax emulsion is significantly better than that of similar products on the market.

[0052] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A leather-specific polishing composite wax emulsion, characterized in that, The raw materials include the following parts by weight: 20-25 parts intermediate wax emulsion, 30-35 parts synthetic emulsified oil, 3-6 parts organosilicon hand feel agent, 3-7 parts oxidized polyethylene wax emulsion, 3-7 parts silicone-modified polyurethane emulsion, 0.2-0.4 parts preservative and 20-30 parts water.

2. The leather-specific polishing composite wax emulsion according to claim 1, characterized in that, The raw materials include the following parts by weight: 22 parts intermediate wax emulsion, 32 parts synthetic emulsified oil, 4.5 parts organosilicon feel agent, 5 parts oxidized polyethylene wax emulsion, 5 parts silicone-modified polyurethane emulsion, 0.3 parts preservative and 25 parts water.

3. The leather-specific polishing composite wax emulsion according to claim 1 or 2, characterized in that, The preparation method of the intermediate wax emulsion includes the following steps: (1) Mix candelilla wax and emulsifier, heat to melt and stir to obtain the first mixture; (2) Add a neutralizing-emulsifying agent to the first mixture and continue stirring to obtain a second mixture; (3) Add hot water to the second mixture and continue stirring to obtain the third mixture; (4) Add preservatives to the third mixture and continue stirring to obtain the intermediate wax emulsion.

4. The leather-specific polishing composite wax emulsion according to claim 3, characterized in that, The preparation method of the intermediate wax emulsion includes the following steps: (1) Mix 17-21 parts by weight of candelilla wax and 4-8 parts by weight of emulsifier, heat to 110-115℃ to melt, then stir and mix evenly and reduce the temperature to 90-95℃ to obtain the first mixture; (2) Add 1-3 parts by weight of neutralizing-emulsifying agent to the first mixture, keep warm at 90-95℃ and continue stirring for 10-15 minutes to obtain the second mixture; (3) Add 72-78 parts by weight of hot water above 95°C to the second mixture and continue stirring. After the addition is complete, keep warm and emulsify for 20-30 minutes, and then cool down to obtain the third mixture; (4) After the temperature is ≤45℃, add 1.3-3.5 parts by weight of the preservative aqueous solution to the third mixture and continue mixing and stirring for 10-15 minutes; (5) Sampling and testing. After the test results meet the standards, the material is filtered out to obtain the intermediate wax emulsion.

5. The leather-specific polishing composite wax emulsion according to claim 1 or 2, characterized in that, The method for preparing the synthetic emulsified oil includes the following steps: (1) Mix 26# white oil, modified vegetable oil, synthetic oil, and fatty alcohol polyoxyethylene ether emulsifier, heat and stir to obtain a fourth mixture; (2) Add hot water to the fourth mixture and continue stirring to obtain the fifth mixture; (3) Add preservatives to the fifth mixture and continue stirring to obtain the synthetic emulsified oil.

6. The leather-specific polishing composite wax emulsion according to claim 5, characterized in that, The method for preparing the synthetic emulsified oil includes the following steps: (1) Mix 2-3 parts by weight of 26# white oil, 10-12 parts by weight of modified vegetable oil, 5-8 parts by weight of synthetic oil and 2-3 parts by weight of fatty alcohol polyoxyethylene ether emulsifier, heat to 50-55℃ and stir for 10-15 minutes to obtain the fourth mixture. (2) Add 73-77 parts by weight of hot water to the fourth mixture and continue stirring. After the addition is complete, keep warm and emulsify for 20-30 minutes, and then cool down to obtain the fifth mixture; (3) After the temperature is ≤45℃, add 1.3-3.5 parts by weight of the preservative aqueous solution to the fifth mixture and continue mixing and stirring for 10-15 minutes; (4) Sampling and testing. After the test results meet the standards, the material is filtered out to obtain the synthetic emulsified oil.

7. The method for preparing the leather-specific polishing composite wax emulsion according to any one of claims 1-6, characterized in that, The preparation method includes the following steps: (1) Mix the intermediate wax emulsion and water and stir to obtain the first premix; (2) Synthetic emulsified oil, organosilicon feel agent, oxidized polyethylene wax emulsion and silicone-modified polyurethane emulsion are added sequentially to the first premixed liquid and stirred evenly to obtain the second premixed liquid; (3) Add preservative to the second premixed liquid and continue stirring to obtain the leather-specific polishing composite wax emulsion.

8. The method for preparing the leather-specific polishing composite wax emulsion according to claim 7, characterized in that, The preparation method includes the following steps: (1) Mix the intermediate wax emulsion and water and stir to obtain the first premix; (2) Add synthetic emulsified oil, organosilicon feel agent, oxidized polyethylene wax emulsion and silicone-modified polyurethane emulsion to the first premix in sequence, stir for 30-40 min until the system is uniform, and obtain the second premix. (3) Add preservative to the second premix and continue stirring for 10-15 minutes to mix thoroughly; (4) Sampling and testing; after the test results meet the standards, the material is filtered and discharged. (5) Finally, the product is bottled and packaged in sequence. After the finished product passes inspection, it is put into storage to obtain the leather-specific polishing composite wax emulsion.

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