Ultra-smooth hand feeling agent as well as preparation method and application thereof

Abstract

The invention provides a super-smooth hand feeling agent and a preparation method and application thereof, and belongs to the field of PU synthetic leather. The invention provides a super-soft and smooth hand feeling agent which comprises the following raw materials in percentage by mass: 12-40% of block silicone oil; 1.5-4% of a reactive emulsifier; 0.2%-6% of a non-ionic surface active agent; 0.01 to 0.5 percent of glacial acetic acid; and the balance of water. The two ends of the molecule of the reactive emulsifier contain hydroxyl groups. The stable nanoscale oil-in-water system is prepared by utilizing the reactive emulsifier containing active hydroxyl groups at two ends and strictly controlling the content of each raw material, so that the stable nanoscale oil-in-water system can be crosslinked with the water-based surface treating agent to form a homogeneous system, the PU leather is endowed with lasting smooth touch feeling, meanwhile, the problem that oil spots and bright spots are generated due to precipitation of silicone oil is solved, and the service life of the PU leather is prolonged. And the qualified rate of products is improved.

Description

Technical Field

[0001] The invention relates to the field of PU synthetic leather, and in particular to a super-soft and smooth feel agent, a preparation method and an application thereof. Background Art

[0002] With economic development and improved living standards, people's demand for leather is increasing, and their quality requirements are also getting higher and higher. Traditional natural leather resources are limited, and the production process generates significant pollution, which can no longer meet market demand. Synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a natural leather substitute.

[0003] Synthetic leather usually uses non-woven fabric to simulate the mesh layer and a microporous polyurethane coating to simulate the grain layer. The resulting synthetic leather is very similar to leather on both the front and back and has a certain degree of breathability. It is closer to natural leather than ordinary artificial leather and is widely used in the production of products such as shoes, boots, luggage, and balls.

[0004] However, synthetic leather has a shiny surface and a strong plastic feel. To make the appearance and feel of synthetic leather closer to natural leather and achieve more ideal performance, it must be surface treated during the production process to impart a smooth, soft feel, as well as waterproof, stain-resistant, and wear-resistant properties. Existing water-based surface treatments typically add micron-sized emulsions such as macromolecular hydroxyl and methyl silicone oils to achieve the desired surface feel. However, these water-based surface treatments often suffer from a hard, plastic-like feel, a short-lasting effect, and the tendency to develop oily spots and bright spots during use, impacting the overall quality of PU leather. Summary of the Invention

[0005] The present invention provides an ultra-soft and smooth feel agent, a preparation method thereof, and an application thereof. The ultra-soft and smooth feel agent of the present invention is added to a PU water-based surfactant and can be evenly dispersed, thereby imparting an ultra-soft and smooth touch while overcoming the problem of oil spots and bright spots caused by silicone oil precipitation.

[0006] The present invention provides an ultra-soft and smooth feel agent, which comprises the following raw materials by mass fraction:

[0007]

[0008] The reactive emulsifier contains hydroxyl groups at both ends of its molecule.

[0009] Preferably, the method for preparing the block silicone oil comprises the following steps:

[0010] The block silicone oil is obtained by mixing epoxy-terminated silicone oil, aliphatic diamine and polar organic solvent and then performing a ring-opening reaction.

[0011] Preferably, the molar ratio of the terminal epoxy silicone oil to the aliphatic diamine is 1:0.5 to 2;

[0012] The relative molecular mass of the terminal epoxy silicone oil is 4000 to 20000; the relative molecular mass of the aliphatic diamine is 200 to 2000.

[0013] Preferably, the temperature of the ring-opening reaction is 80 to 120 °C, and the time is 6 to 10 h.

[0014] Preferably, the preparation method of the reactive emulsifier includes the following steps:

[0015] Mix the terminal hydrogen-containing silicone oil, allyl polyether and inorganic catalyst to carry out a hydrosilylation reaction to obtain the reactive emulsifier.

[0016] Preferably, the molar ratio of the terminal hydrogen-containing silicone oil to the allyl polyether is 1.0:1.0 to 2.2;

[0017] The relative molecular mass of the terminal hydrogen-containing silicone oil is 2000 to 6000;

[0018] The relative molecular mass of the allyl polyether is 200 to 5000.

[0019] Preferably, the inorganic catalyst includes chloroplatinic acid.

[0020] Preferably, the non-ionic surfactant includes isomeric alcohol polyoxyethylene ether and / or fatty alcohol polyoxyethylene ether.

[0021] The present invention also provides a preparation method of the super-smooth hand feel agent described in the above technical solution, including the following steps:

[0022] Mix the block silicone oil, reactive emulsifier, non-ionic surfactant and organic acid, and then mix with water to obtain the super-smooth hand feel agent.

[0023] The present invention also provides the application of the super-smooth hand feel agent described in the above technical solution or the super-smooth hand feel agent prepared by the preparation method described in the above technical solution in the aqueous surface treatment of PU synthetic leather.

[0024] The present invention uses a reactive emulsifier with active hydroxyl groups at both ends and strictly controls the content of each raw material to prepare a stable nano-scale oil-in-water system. The hydroxyl groups crosslink with the isocyanate in the aqueous surface treatment agent resin to form a homogeneous system, endowing the PU leather with a lasting smooth touch. At the same time, the nano-scale oil-in-water system overcomes the problems of high hydrophobicity, poor compatibility and precipitation of oil spots and bright spots of ordinary silicone oil, and improves the qualified rate of products. Specific embodiments

[0025] The present invention provides a super-smooth hand feel agent, which includes the following raw materials in terms of mass fraction:

[0026]

[0027]

[0028] Both ends of the molecule of the reactive emulsifier contain hydroxyl groups.

[0029] In the present invention, unless otherwise specified, the raw materials are all commercially available products well-known to those skilled in the art.

[0030] By mass fraction, the raw materials of the super-smooth hand feel agent provided by the present invention include 12-40% of block silicone oil. In specific embodiments of the present invention, the mass fraction of the block silicone oil can be 12%, 15%, 20%, 25%, 30%, 35% or 40%.

[0031] In the present invention, the preparation method of the block silicone oil preferably includes the following steps:

[0032] Mix the terminal epoxy silicone oil, aliphatic diamine and polar organic solvent, and then carry out a ring-opening reaction to obtain the block silicone oil.

[0033] In the present invention, the molar ratio of the terminal epoxy silicone oil to the aliphatic diamine is preferably 1:0.5-2. In specific embodiments of the present invention, the molar ratio of the terminal epoxy silicone oil to the aliphatic diamine can be 1:0.5, 1:1, 1:1.5 or 1:2; the relative molecular mass of the terminal epoxy silicone oil is preferably 4000-20000. In specific embodiments of the present invention, the molecular weight of the terminal epoxy silicone oil can be 4000, 6000, 8000, 10000, 12000, 14000, 16000, 18000 or 20000; the relative molecular mass of the aliphatic diamine is preferably 200-2000. In specific embodiments of the present invention, the relative molecular mass of the aliphatic diamine can be 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800 or 2000; the aliphatic diamine preferably comes from one or more of D400, ED600 and ED900 produced by Huntsman Corporation, Yangzhou Chenhua New Materials Co., Ltd. or Zhejiang Huangma Science & Technology Co., Ltd., and more preferably ED600 and / or ED900 of Huntsman Corporation.

[0034] In the present invention, the mass of the polar organic solvent preferably accounts for 20-40% of the total mass of the terminal epoxy silicone oil and the aliphatic diamine. In specific embodiments of the present invention, the mass of the polar organic solvent can account for 20%, 25%, 30%, 35% or 40% of the total mass of the terminal epoxy silicone oil and the aliphatic diamine; the polar organic solvent preferably includes one or more of isopropyl alcohol, ethylene glycol monobutyl ether and diethylene glycol monobutyl ether, and more preferably isopropyl alcohol.

[0035] In the present invention, the temperature of the ring-opening reaction is 80-120°C and the time is 6-10 h. In specific embodiments of the present invention, the temperature of the ring-opening reaction can be 80°C, 90°C, 100°C, 110°C or 120°C, and the time can be 6 h, 7 h, 8 h, 9 h or 10 h.

[0036] In the present invention, the ring-opening reaction is preferably carried out under stirring conditions, and the stirring speed is preferably 200-600 r / min. In specific embodiments of the present invention, the stirring speed can be 200 r / min, 300 r / min, 400 r / min, 500 r / min or 600 r / min.

[0037] In the present invention, after the ring-opening reaction is completed, the present invention preferably cools the obtained product to room temperature to obtain the block silicone oil.

[0038] In terms of mass fraction, the raw materials of the super-smooth hand feel agent provided by the present invention include 1.5-4% of a reactive emulsifier. In specific embodiments of the present invention, the mass fraction of the reactive emulsifier can be 1.5%, 2%, 2.5%, 3%, 3.5% or 4%.

[0039] In the present invention, the preparation method of the reactive emulsifier preferably includes the following steps:

[0040] Mix the terminal hydrogen-containing silicone oil, allyl polyether and inorganic catalyst to carry out a hydrosilylation reaction to obtain the reactive emulsifier.

[0041] In the present invention, the mixing preferably includes first mixing the terminal hydrogen-containing silicone oil and allyl polyether, and then second mixing the obtained mixture with the inorganic catalyst.

[0042] In the present invention, the first mixing is preferably carried out under stirring conditions, and the stirring speed is preferably 200-600 r / min. In specific embodiments of the present invention, the stirring speed can be 200 r / min, 300 r / min, 400 r / min, 500 r / min or 600 r / min

[0043] The temperature of the first mixing is 40-60°C. In specific embodiments of the present invention, the temperature of the first mixing can be 40°C, 45°C, 50°C, 55°C or 60°C.

[0044] In the present invention, the molar ratio of the terminal hydrogen-containing silicone oil to the allyl polyether is preferably 1:1-2.2. In specific embodiments of the present invention, the molar ratio of the terminal hydrogen-containing silicone oil to the allyl polyether can be 1:1, 1:1.2, 1:1.5, 1:1.8, 1:2 or 1:2.2; the relative molecular mass of the terminal hydrogen-containing silicone oil is preferably 2000-6000. In specific embodiments of the present invention, the relative molecular mass of the terminal hydrogen-containing silicone oil can be 1000, 2500, 3000, 3500, 4000, 4500, 5000, 5500 or 6000; the relative molecular mass of the allyl polyether is preferably 200-5000. In specific embodiments of the present invention, the relative molecular mass of the allyl polyether can be 200, 1000, 2000, 3000, 4000 or 5000; the allyl polyether preferably includes polyether F6 or polyether F10 produced by Jiangsu Zhongshan Chemical Co., Ltd., Yangzhou Chenhua New Materials Co., Ltd. or Liaoning Kelong Fine Chemical Co., Ltd., and more preferably polyether F6 or polyether F10 of Jiangsu Zhongshan Chemical Co., Ltd.

[0045] In the present invention, the mass of the catalyst is preferably 0.5% of the mass of the terminal hydrogen-containing silicone oil; the inorganic catalyst includes chloroplatinic acid.

[0046] In the present invention, the temperature of the hydrosilylation reaction is preferably 100-140°C, and the time is preferably 2-6 h. In specific embodiments of the present invention, the temperature of the hydrosilylation reaction can be 100°C, 110°C, 120°C, 130°C or 140°C, and the time can be 2 h, 3 h, 4 h, 5 h or 6 h.

[0047] In the present invention, after the hydrosilylation reaction is completed, the present invention preferably cools the obtained product to room temperature to obtain the reactive emulsifier.

[0048] By mass fraction, the raw materials of the super-smooth hand feel agent provided by the present invention include 0.2 - 6% of non-ionic surfactant. In specific embodiments of the present invention, the mass fraction of the non-ionic surfactant can be 0.2%, 0.5%, 1%, 2%, 3%, 4%, 5% or 6%; the non-ionic surfactant preferably includes isomeric alcohol polyoxyethylene ether and / or fatty alcohol polyoxyethylene ether; the fatty alcohol polyoxyethylene ether preferably includes AEO series products, and the AEO series products preferably come from BASF SE, Shell Group or Sanjiang Chemical Co., Ltd. In specific embodiments of the present invention, the linear alkyl alcohol polyoxyethylene ether is preferably BASF AEO-9; the isomeric alcohol polyoxyethylene ether preferably includes isomeric tridecyl alcohol polyoxyethylene ether; the isomeric tridecyl alcohol polyoxyethylene ether preferably comes from BASF SE or Sasol Chemicals. In specific embodiments of the present invention, the isomeric tridecyl alcohol polyoxyethylene ether is specifically Sasol 1370 isomeric tridecyl alcohol polyoxyethylene ether.

[0049] By mass fraction, the raw materials of the super-smooth hand feel agent provided by the present invention include 0.01 - 0.5% of organic acid. In specific embodiments of the present invention, the mass fraction of the organic acid can be 0.1%, 0.2%, 0.3%, 0.4% or 0.5%; the organic acid preferably includes one or more of glacial acetic acid, citric acid and lactic acid, preferably glacial acetic acid. The function of the organic acid is to promote the transformation of the oil phase to the water phase and adjust the pH value of the emulsion.

[0050] By mass fraction, the raw materials of the super-smooth hand feel agent provided by the present invention include the balance of water.

[0051] The present invention also provides a preparation method of the super-smooth hand feel agent described in the above technical solution, including the following steps:

[0052] Mix the block silicone oil, reactive emulsifier, non-ionic surfactant and glacial acetic acid (the third mixing) and then mix with water (the fourth mixing).

[0053] In the present invention, the third mixing is preferably carried out under stirring, and the stirring speed is preferably 600 - 2000 r / min. In specific embodiments of the present invention, the stirring speed can be 600 r / min, 1000 r / min, 1500 r / min, 1800 r / min or 2000 r / min.

[0054] In the present invention, the third mixing preferably includes: mixing the block silicone oil and the reactive emulsifier for the third' mixing and then mixing with the non-ionic surfactant and glacial acetic acid for the third" mixing.

[0055] In the present invention, the time for the third' mixing and the third" mixing is independently preferably 30 to 60 minutes. In specific embodiments of the present invention, the time for the third' mixing and the third" mixing can independently be 30 minutes, 40 minutes, 50 minutes or 60 minutes.

[0056] In the present invention, the fourth mixing preferably includes adding water dropwise to the mixture obtained from the third mixing.

[0057] In the present invention, the time for the dropwise addition is preferably 2.5 to 3 hours.

[0058] The present invention also provides the application of the above-mentioned super smooth hand feel agent in the aqueous surface treatment of PU synthetic leather.

[0059] The present invention has no special requirements for the specific implementation manner of the application, and the common methods used by those skilled in the art can be adopted.

[0060] In specific embodiments of the present invention, the method of the application preferably includes the following steps:

[0061] Mix the aqueous surface treatment agent and the super smooth hand feel agent and then coat them on the surface of the PU synthetic leather and then dry.

[0062] In the present invention, the mass ratio of the aqueous surface treatment agent to the super smooth hand feel agent is preferably 20:1.

[0063] In the present invention, by mass, the aqueous surface treatment agent preferably includes: [[ID=2,6]]

[0064]

[0065] The solid content of the aqueous polyurethane resin is preferably 25%.

[0066] The present invention has no special limitation on the type of the aqueous polyurethane resin and the types of the wetting and leveling agent, defoaming agent and thickening agent, and those well-known to those skilled in the art can be adopted.

[0067] The present invention has no special limitation on the coating, and the methods well-known to those skilled in the art can be adopted.

[0068] The following combines examples to elaborate in detail on the super smooth hand feel agent provided by the present invention, its preparation method and application, but they cannot be construed as limiting the protection scope of the present invention.

[0069] Example 1

[0070] Preparation of block silicone oil:

[0071] Add the terminal epoxy silicone oil YK-276-6K (Zhejiang Yingke New Materials Co., Ltd.), aliphatic diamine ED600 (Huntsman Corporation), and isopropanol (the amount is 30% of the total mass of the terminal epoxy silicone oil and aliphatic diamine) into a four-necked flask, start stirring, and under the condition of a rotation speed of 400 r / min, heat up to 80 - 82 °C, react for 8 h, and cool to room temperature to obtain a light yellow to golden yellow transparent liquid, which is the block silicone oil.

[0072] Among them, the molar ratio of the terminal epoxy silicone oil to the aliphatic diamine is 1.0:1.2.

[0073] Preparation of the reactive emulsifier:

[0074] Add the terminal hydrogen-containing silicone oil YK-616-3K with a relative molecular mass of 3000 (Zhejiang Yingke New Materials Co., Ltd.) and allyl polyether (polyether F6 from Jiangsu Zhongshan Chemical Industry Co., Ltd.) into a four-necked flask, start stirring, and under the condition of a rotation speed of 600 r / min, heat up to 45 °C, add the catalyst chloroplatinic acid, continue to heat up to 120 °C, after the reaction solution turns transparent, continue to keep the temperature for reaction for 4 h, and cool to room temperature to obtain a colorless to light yellow transparent liquid, which is the reactive emulsifier.

[0075] Among them, the molar ratio of the terminal hydrogen-containing silicone oil to the allyl polyether is 1.0:2.2;

[0076] The catalyst is 0.5% of the mass of the terminal hydrogen-containing silicone oil.

[0077] Preparation of the super-smooth handfeel agent:

[0078] Add 20 g of the reactive emulsifier and 200 g of the block silicone oil into an emulsifier, turn on the power of the emulsifier, with a rotation speed of 800 r / min, mechanically stir for 0.5 h, then add 40 g of non-ionic surfactant AE0-9 and 1 g of glacial acetic acid while stirring, continue to stir for 0.5 h, and slowly add 1000 g of non-ionic water within 2 h to obtain the super-smooth handfeel agent.

[0079] Example 2

[0080] Preparation of the block silicone oil:

[0081] Add the terminal epoxy silicone oil YK-276-8K with a relative molecular mass of 8000 (Zhejiang Yingke New Materials Co., Ltd.), aliphatic diamine ED900 (Huntsman Corporation), and isopropanol (the amount is 30% of the total mass of the terminal epoxy silicone oil and aliphatic diamine) into a four-necked flask, start stirring, and under the condition of a rotation speed of 500 r / min, heat up to 80 - 82 °C, react for 10 h, and cool to room temperature to obtain a light yellow to golden yellow transparent liquid, which is the block silicone oil.

[0082] Among them, the molar ratio of the terminal epoxy silicone oil to the aliphatic diamine is 1.0:1.2.

[0083] Preparation of reactive emulsifier:

[0084] Hydrogen-terminated silicone oil YK-616-4K with a relative molecular mass of 4000 (Zhejiang Yingke New Materials Co., Ltd.) and allyl polyether (polyether F10 of Jiangsu Zhongshan Chemical Co., Ltd.) were added to a four-necked flask and stirred. While stirring at a speed of 600 r / min, the temperature was raised to 50 °C, and chloroplatinic acid as a catalyst was added. Then the temperature was further raised to 120 °C. After the reaction solution became transparent, the reaction was continued under insulation for 3 h. After cooling to room temperature, a colorless to light yellow transparent liquid was obtained, which was the reactive emulsifier.

[0085] The molar ratio of the hydrogen-terminated silicone oil to the allyl polyether was 1.0:2.2;

[0086] The catalyst was 0.5% of the mass of the hydrogen-terminated silicone oil.

[0087] Preparation of super-smooth handfeel agent:

[0088] 30 g of the reactive emulsifier and 200 g of block silicone oil were added to an emulsifier. The power of the emulsifier was turned on, and the stirring speed was 800 r / min. Mechanical stirring was carried out for 0.5 h. Then, while stirring, 40 g of non-ionic surfactant AE0-9 and 1 g of glacial acetic acid were added. Stirring was continued for 0.5 h, and 800 g of non-ionic water was slowly added dropwise within 2.5 h to obtain the super-smooth handfeel agent.

[0089] Example 3

[0090] Preparation of block silicone oil:

[0091] Epoxy-terminated silicone oil YK-276-9K with a relative molecular mass of 9000 (Zhejiang Yingke New Materials Co., Ltd.), aliphatic diamine ED900 (Huntsman Corporation), and isopropyl alcohol (the amount used was 40% of the total mass of the epoxy-terminated silicone oil and the aliphatic diamine) were added to a four-necked flask and stirred. While stirring at a speed of 500 r / min, the temperature was raised to 80 - 82 °C, and the reaction was carried out for 10 h. After cooling to room temperature, a light yellow to golden yellow transparent liquid was obtained, which was the block silicone oil.

[0092] The molar ratio of the epoxy-terminated silicone oil to the aliphatic diamine was 1.0:1.2.

[0093] Preparation of reactive emulsifier:

[0094] Add the hydrogen-terminated silicone oil YK-616-4K with a relative molecular mass of 4000 (Zhejiang Yingke New Materials Co., Ltd.) and allyl polyether (polyether F6 from Jiangsu Zhongshan Chemical Co., Ltd.) into a four-necked flask, start stirring, and when the rotation speed is 400 r / min, heat up to 40 °C, add the catalyst chloroplatinic acid, continue to heat up to 110 °C. After the reaction solution turns transparent, continue the insulation reaction for 2 h, and cool to room temperature to obtain a colorless to light yellow transparent liquid, which is the reactive emulsifier.

[0095] The molar ratio of the hydrogen-terminated silicone oil to the allyl polyether is 1.0:2.2;

[0096] The catalyst is 0.5% of the mass of the hydrogen-terminated silicone oil;

[0097] Preparation of the super-smooth handfeel agent:

[0098] Add 40 g of the reactive emulsifier and 200 g of block silicone oil into the emulsifier, turn on the power of the emulsifier, with a rotation speed of 800 r / min, mechanically stir for 0.5 h, then add 4 g of the non-ionic surfactant Sasol 1370 isomeric tridecyl alcohol polyoxyethylene ether and 0.2 g of glacial acetic acid while stirring, continue to stir for 0.5 h, and slowly add 1200 g of non-ionic water dropwise within 3 h to obtain the super-smooth handfeel agent.

[0099] Application Example 1

[0100] Mix 100 parts of waterborne polyurethane resin JF-W-6003J (25% solid content) from Zhejiang Huafeng New Materials Co., Ltd., 280 parts of water, 4 parts of silicone defoamer SY-2280W (Jiangxi Sanyue High Molecular Materials Co., Ltd.), 8 parts of wetting and leveling agent SY-8029 (Jiangxi Sanyue High Molecular Materials Co., Ltd.), 8 parts of dimethylformamide, and 4 parts of low-shear associative polyurethane thickener SY-1052 (Jiangxi Sanyue High Molecular Materials Co., Ltd.) to obtain a waterborne surface treatment agent mother liquor; mix again according to 100 parts of the waterborne surface treatment agent and 5 parts of the super-smooth handfeel agent obtained in Example 1 to obtain a waterborne smooth treatment agent slurry.

[0101] Scrape the waterborne smooth handfeel treatment agent slurry onto the surface of the synthetic leather through a 100-mesh roller of a three-plate printing machine.

[0102] Application Example 2

[0103] Prepare the waterborne surface treatment PU synthetic leather according to the preparation method of Application Example 1, the difference is:

[0104] Replace the super-smooth handfeel agent prepared in Example 1 with the super-smooth handfeel agent prepared in Example 2.

[0105] Application Example 3

[0106] Prepare the water-based surface-treated PU synthetic leather according to the preparation method of Application Example 1, with the difference that:

[0107] Replace the super-smooth hand feel agent prepared in Example 1 with the super-smooth hand feel agent prepared in Example 3.

[0108] Comparative Application Example 1

[0109] Prepare the water-based surface-treated PU synthetic leather according to the preparation method of Application Example 1, with the difference that:

[0110] Change the super-smooth hand feel agent prepared in Example 1 to the commercially available competitor Dow Corning DC-51.

[0111] Comparative Application Example 2

[0112] Prepare the water-based surface-treated PU synthetic leather according to the preparation method of Application Example 1, with the difference that:

[0113] Do not add the super-smooth hand feel agent.

[0114] Performance Test

[0115] Observe whether there is silicone oil precipitation to produce oil spot highlights on the surface of the synthetic leather prepared in Application Examples 1 to 3 and Comparative Application Examples 1 to 2, and conduct a hand feel evaluation test on the synthetic leather.

[0116] Table 1 Performance test results of the synthetic leather in Application Examples 1 to 3 and Comparative Application Examples 1 to 2

[0117] Synthetic leather sample Application Example 1 Application Example 2 Application Example 3 Comparative Application Example 1 Comparative Application Example 2 Whether silicone oil precipitates on the surface None None None Yes None Hand feeling Smooth Smooth Smooth Dry and smooth Rough Persistence of hand feeling Excellent Excellent Excellent Average Poor Scratch resistance Excellent Excellent Excellent Good Poor Softness Excellent Excellent Excellent Excellent Poor

[0118] As can be seen from Table 1, the water-based surface-treated PU synthetic leather prepared in Application Examples 1 to 3 has outstanding overall performance, good scratch resistance, excellent softness, no silicone oil precipitation on the surface, and has an excellent persistent smooth touch effect. And the hand feel performance of Application Example 2 is better than that of Application 1 which is better than that of Application Example 3, and the scratch resistance performance of Application Example 3 is better than that of Application Example 2 which is better than that of Application Example 1; the water-based surface-treated PU synthetic leather prepared in Comparative Application Example 1 has a dry and smooth hand feel, strong plastic feeling and is prone to produce precipitated oil spots, seriously affecting the quality of the synthetic leather.

[0119] The above is only the preferred implementation manner of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A super-smooth hand feel agent, characterized in that, Comprising the following raw materials by mass fraction: Both ends of the molecular of the reactive emulsifier contain hydroxyl groups.

2. The super-smooth feel agent according to claim 1, characterized in that, The preparation method of the block silicone oil comprises the following steps: Mix the terminal epoxy silicone oil, aliphatic diamine and polar organic solvent and carry out ring-opening reaction to obtain the block silicone oil.

3. The super-smooth feel agent according to claim 2, characterized in that, The molar ratio of the terminal epoxy silicone oil to the aliphatic diamine is 1:0.5 - 2; The relative molecular mass of the terminal epoxy silicone oil is 4000 - 20000; the relative molecular mass of the aliphatic diamine is 200 - 2000.

4. The super-smooth feel agent according to claim 2 or 3, characterized in that, The temperature of the ring-opening reaction is 80 - 120 °C, and the time is 6 - 10 h.

5. The super-smooth feel agent according to claim 1, characterized in that, The preparation method of the reactive emulsifier comprises the following steps: Mix the terminal hydrogen-containing silicone oil, allyl polyether and inorganic catalyst and carry out hydrosilylation reaction to obtain the reactive emulsifier.

6. The super-smooth feel agent according to claim 5, wherein The molar ratio of the terminal hydrogen-containing silicone oil to the allyl polyether is 1.0:1.0 - 2.2; The relative molecular mass of the terminal hydrogen-containing silicone oil is 2000 - 6000; The relative molecular mass of the allyl polyether is 200 - 5000.

7. The super-smooth feel agent according to claim 5, characterized in that, The inorganic catalyst includes chloroplatinic acid.

8. The super-smooth feel agent according to claim 1, wherein The non-ionic surfactant includes isomeric alcohol polyoxyethylene ether and / or fatty alcohol polyoxyethylene ether.

9. The preparation method of the super-smooth hand feeling agent according to any one of claims 1 to 8, characterized in that, Comprising the following steps: Mix the block silicone oil, reactive emulsifier, non-ionic surfactant and organic acid, and then mix with water to obtain the super-smooth handfeel agent.

10. Application of the super-smooth handfeel agent according to any one of claims 1 - 8 or the super-smooth handfeel agent prepared by the preparation method according to claim 9 in the aqueous surface treatment of PU synthetic leather.

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