A stripping agent composition and its application in stripping velvet release paper for polyurethane dry synthetic leather

Abstract

The present invention belongs to the technical field of polyurethane synthetic leather, and specifically relates to a stripping agent composition and its application in the stripping of velvet release paper for polyurethane dry synthetic leather. The stripping agent composition provided by the present invention comprises fluorine-modified polyether silicone oil, dimethyl silicone oil and dimethylformamide; the fluorine-modified polyether silicone oil is obtained by reacting hydrogen-containing silicone oil, hexafluorobutyl acrylate and alkyl-terminated allyl polyether; the mass of the dimethyl silicone oil accounts for ≤15% of the mass of the fluorine-modified polyether silicone oil; the mass of the dimethylformamide accounts for ≤10% of the mass of the fluorine-modified polyether silicone oil. The stripping agent composition provided by the present invention can increase the number of uses of velvet release paper, and can increase the number of uses of release paper by 20 to 30 times. It not only does not affect the color development of the suede synthetic leather product, but can even improve the color development effect, thereby greatly reducing production costs and improving product quality and production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane synthetic leather, and particularly relates to a stripping agent composition and application thereof in stripping velvet-feel release paper for polyurethane dry-process synthetic leather. Background Art

[0002] Suede synthetic leather is widely favored in the market for its silky, velvety feel and is widely used in clothing fabrics, interior decoration materials, leather shoes and bags, furniture and home furnishings, automotive interiors, and other industries. Traditionally, suede synthetic leather was primarily produced by applying a velvety leather finish to the surface of polyurethane (PU) dry-process synthetic leather. This suede effect not only added an extra step to the manufacturing process, increasing costs, but also suffered from shortcomings such as a weak velvety feel, poor surface fastness, and subpar softness.

[0003] In recent years, with the emergence and widespread adoption of various velvet release papers, the use of these release papers in the production of suede synthetic leather has gradually replaced traditional surface coating methods. This simplifies the production process and results in suede synthetic leather with a stronger velvet feel, excellent surface fastness, and superior softness. Due to these superior properties, velvet release paper is generally much more expensive than ordinary release paper. Furthermore, compared to ordinary release paper, velvet release paper has a larger surface area, making it difficult to peel and easily damaged, resulting in limited reuse and higher costs.

[0004] Existing stripping aids suitable for ordinary release paper have almost no effect on the stripping of velvet release paper. Summary of the Invention

[0005] The object of the present invention is to provide a stripping agent composition and its application in the stripping of velvet-feel release paper for polyurethane dry-process synthetic leather. The stripping agent composition provided by the present invention is used in the stripping of velvet-feel release paper for polyurethane dry-process synthetic leather, and can reduce the surface tension of the polyurethane coating, so that the adhesion between the coating and the velvet-feel release paper is greatly reduced, thereby effectively increasing the number of times the velvet-feel release paper can be used, greatly reducing production costs, and improving product quality and production efficiency.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a stripping agent composition, comprising fluorine-modified polyether silicone oil, dimethyl silicone oil and dimethylformamide; the fluorine-modified polyether silicone oil is obtained by reacting hydrogen-containing silicone oil, hexafluorobutyl acrylate and alkyl-terminated allyl polyether;

[0008] The mass percentage of the dimethyl silicone oil to the mass percentage of the fluorine-modified polyether silicone oil is ≤15%;

[0009] The mass percentage of the dimethylformamide to the mass percentage of the fluorine-modified polyether silicone oil is ≤10%.

[0010] Preferably, the mass percentage of the dimethyl silicone oil to the mass percentage of the fluorine-modified polyether silicone oil is 5-15%;

[0011] The mass percentage of the dimethylformamide to the mass percentage of the fluorine-modified polyether silicone oil is 5-10%.

[0012] Preferably, the preparation method of the fluorine-modified polyether silicone oil comprises the following steps:

[0013] In a protective gas atmosphere, heating and mixing hydrogenated silicone oil, hexafluorobutyl acrylate and a first inorganic platinum catalyst to carry out a modification reaction to obtain a reaction solution of fluorine-containing modified silicone oil;

[0014] In a protective gas atmosphere, the reaction liquid of the fluorine-modified silicone oil, the alkyl-terminated allyl polyether and the second inorganic platinum catalyst are mixed and subjected to an addition reaction to obtain the fluorine-modified polyether silicone oil.

[0015] Preferably, the hydrogen content of the hydrogen-containing silicone oil is 0.05-0.1%;

[0016] Calculated based on the amount of active hydrogen atoms on Si-H bonds in the hydrogen-containing silicone oil, the molar ratio of the hydrogen-containing silicone oil to the hexafluorobutyl acrylate is 1:(0.3-0.7).

[0017] Preferably, the relative molecular mass of the alkyl-terminated allyl polyether is 400-2000, and the alkyl-terminated allyl polyether is methyl-terminated allyl polyether and / or butyl-terminated allyl polyether.

[0018] Preferably, the molar ratio of the hydrogen-containing silicone oil to the alkyl-terminated allyl polyether is 1:(0.7-1.1) based on the amount of active hydrogen atoms on Si-H bonds in the hydrogen-containing silicone oil.

[0019] Preferably, the first inorganic platinum catalyst and the second inorganic platinum catalyst are independently chloroplatinic acid or chloroplatinic acid hexahydrate;

[0020] The mass of the first inorganic platinum catalyst accounts for 2 to 10 ppm of the total mass of the hydrogenated silicone oil and the hexafluorobutyl acrylate;

[0021] The mass of the second inorganic platinum catalyst accounts for 2 to 10 ppm of the total mass of the hydrogenated silicone oil, the hexafluorobutyl acrylate and the alkyl-terminated allyl polyether.

[0022] Preferably, the temperature of the modification reaction is 120-150° C., and the insulation time of the modification reaction is 2-4 hours;

[0023] The temperature of the addition reaction is 130-150° C., and the insulation time of the addition reaction is 2-3 hours.

[0024] The present invention provides application of the stripping aid composition described in the above technical solution in stripping velvet-feel release paper for polyurethane dry-process synthetic leather.

[0025] Preferably, the peeling of the velvet release paper for polyurethane dry-process synthetic leather comprises the following steps:

[0026] Mixing the raw materials of the polyurethane dry process mother liquor and the stripping agent to obtain the polyurethane dry process mother liquor containing the stripping agent;

[0027] The polyurethane dry process master solution containing a stripping agent is coated on the velvet release paper, and after the first heating and curing, a polyurethane film is formed;

[0028] After the polyurethane film is laminated with the PU wet-process BASE or base fabric and subjected to a second heating and curing step, the velvet release paper is peeled off;

[0029] The temperatures for the first heating and curing and the second heating and curing are both 140°C.

[0030] The present invention provides a stripping agent composition, comprising fluorine-modified polyether silicone oil, dimethyl silicone oil, and dimethylformamide; the fluorine-modified polyether silicone oil is obtained by reacting hydrogenated silicone oil, hexafluorobutyl acrylate, and alkyl-terminated allyl polyether; the mass percentage of the dimethyl silicone oil to the mass percentage of the fluorinated polyether silicone oil is ≤15%; the mass percentage of the dimethylformamide to the mass percentage of the fluorinated polyether silicone oil is ≤10%. In order to effectively improve the stripping effect of the stripping agent on velvety release paper, the present invention uses fluorine-modified polyether silicone oil as the main component: hexafluorobutyl acrylate is used to introduce fluorine-containing groups into the hydrogenated silicone oil, and the fluorine-containing groups can greatly reduce surface tension and improve the stripping effect; in addition, the use of alkyl-terminated allyl polyether instead of unterminated ordinary allyl polyether can prevent the hydroxyl groups from cross-linking with the surface materials of the velvety release paper to produce substances that are not conducive to stripping because the raw materials do not contain hydroxyl groups. The present invention compounded a small amount of dimethyl silicone oil and dimethylformamide, using dimethylformamide to achieve a more uniform mixing of the above raw materials, and utilizing the lubricating effect of the dimethyl silicone oil to enhance the peeling effect in a single step. The stripping aid composition provided by the present invention, with the addition of only 1-2% by weight of the PU synthetic leather dry slurry, can solve the problem of difficult peeling of velvety release paper, increase the number of uses of the velvety release paper by 20 to 30 times, and not only does it not affect the color development of the finished suede synthetic leather, but can even improve the color development effect, thereby significantly reducing production costs and improving product quality and production efficiency. DETAILED DESCRIPTION

[0031] The present invention provides a stripping agent composition, comprising fluorine-modified polyether silicone oil, dimethyl silicone oil and dimethylformamide; the fluorine-modified polyether silicone oil is obtained by reacting hydrogen-containing silicone oil, hexafluorobutyl acrylate and alkyl-terminated allyl polyether;

[0032] The mass percentage of the dimethyl silicone oil to the mass percentage of the fluorine-modified polyether silicone oil is ≤15%;

[0033] The mass percentage of the dimethylformamide to the mass percentage of the fluorine-modified polyether silicone oil is ≤10%.

[0034] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0035] The stripping agent composition provided by the present invention comprises fluorine-modified polyether silicone oil.

[0036] In the present invention, the preparation method of the fluorine-modified polyether silicone oil comprises the following steps:

[0037] In a protective gas atmosphere, heating and mixing hydrogenated silicone oil, hexafluorobutyl acrylate and a first inorganic platinum catalyst to carry out a modification reaction to obtain a reaction solution of fluorine-containing modified silicone oil;

[0038] In a protective gas atmosphere, the reaction liquid of the fluorine-modified silicone oil, the alkyl-terminated allyl polyether and the second inorganic platinum catalyst are mixed and subjected to an addition reaction to obtain the fluorine-modified polyether silicone oil.

[0039] The invention heats and mixes hydrogenated silicone oil, hexafluorobutyl acrylate and a first inorganic platinum catalyst in a protective gas atmosphere to carry out a modification reaction to obtain a reaction liquid of fluorine-containing modified silicone oil.

[0040] In the present invention, the hydrogen content of the hydrogen-containing silicone oil is preferably 0.05-0.1%, more preferably 0.06-0.08%. In the present invention, the hydrogen content of the hydrogen-containing silicone oil is preferably 0.05-0.1%, that is, the hydrogen atom equivalent of the hydrogen-containing silicone oil is 1000-2000.

[0041] In the present invention, the first inorganic platinum catalyst is preferably chloroplatinic acid or chloroplatinic acid hexahydrate.

[0042] In the present invention, the molar ratio of the hydrogen-containing silicone oil to the hexafluorobutyl acrylate is preferably 1:(0.3-0.7), more preferably 1:(0.35-0.6), based on the amount of active hydrogen atoms on the Si-H bonds in the hydrogen-containing silicone oil (in terms of hydrogen atom equivalent).

[0043] In the present invention, the mass of the first inorganic platinum catalyst preferably accounts for 2 to 10 ppm, more preferably 3 to 8 ppm, of the total mass of the hydrogenated silicone oil and the hexafluorobutyl acrylate.

[0044] In the present invention, the protective gas is preferably nitrogen or an inert gas, more preferably nitrogen.

[0045] In the present invention, the temperature of the modification reaction is preferably 120-150° C., and the insulation time of the modification reaction is preferably 2-4 hours.

[0046] After obtaining the reaction liquid of fluorine-modified silicone oil, the present invention mixes the reaction liquid of fluorine-modified silicone oil, alkyl-terminated allyl polyether and a second inorganic platinum catalyst in a protective gas atmosphere to carry out an addition reaction to obtain the fluorine-modified polyether silicone oil.

[0047] In the present invention, the relative molecular mass of the alkyl-terminated allyl polyether is preferably 400 to 2000, more preferably 500 to 1800.

[0048] In the present invention, the alkyl-terminated allyl polyether is preferably a methyl-terminated allyl polyether and / or a butyl-terminated allyl polyether.

[0049] In the present invention, the molar ratio of the hydrogen-containing silicone oil to the alkyl-terminated allyl polyether is preferably 1:(0.7-1.1), more preferably 1:(0.8-1), based on the amount of active hydrogen atoms on the Si-H bonds in the hydrogen-containing silicone oil (in terms of hydrogen atom equivalent).

[0050] In the present invention, the second inorganic platinum catalyst is preferably chloroplatinic acid or chloroplatinic acid hexahydrate.

[0051] In the present invention, the mass of the second inorganic platinum catalyst preferably accounts for 2 to 10 ppm, more preferably 3 to 9 ppm, of the total mass of the hydrogenated silicone oil, the hexafluorobutyl acrylate and the alkyl-terminated allyl polyether.

[0052] In the present invention, the temperature of the addition reaction is preferably 130-150° C., and the insulation time of the addition reaction is preferably 2-3 hours.

[0053] The stripping agent composition provided by the present invention comprises dimethyl silicone oil.

[0054] In the present invention, the mass percentage of the dimethyl silicone oil to the mass percentage of the fluorine-modified polyether silicone oil is preferably 5-15%, more preferably 6-12%.

[0055] The stripping agent composition provided by the present invention comprises dimethylformamide.

[0056] In the present invention, the mass percentage of the dimethylformamide to the mass percentage of the fluorine-modified polyether silicone oil is preferably 5-10%, more preferably 6-8%.

[0057] The present invention provides a method for preparing the stripping agent composition described in the above technical solution, comprising the following steps:

[0058] The stripping agent composition is obtained by kneading fluorine-modified polyether silicone oil, dimethyl silicone oil and dimethylformamide.

[0059] In the present invention, the kneading is preferably performed using a kneader.

[0060] In the present invention, the kneading time is preferably 1 to 2 hours.

[0061] The present invention provides the use of the stripping aid composition described in the above technical solution in the stripping of velvet-feel release paper for polyurethane dry-process synthetic leather.

[0062] In the present invention, the peeling of the velvet release paper for polyurethane dry-process synthetic leather preferably comprises the following steps:

[0063] Mixing the raw materials of the polyurethane dry process mother liquor and the stripping agent to obtain the polyurethane dry process mother liquor containing the stripping agent;

[0064] The polyurethane dry process master solution containing a stripping agent is coated on the velvet release paper, and after the first heating and curing, a polyurethane film is formed;

[0065] After the polyurethane film is laminated with the PU wet-process BASE or base fabric and subjected to a second heating and curing process, the velvet release paper is peeled off.

[0066] The invention mixes raw materials of polyurethane dry process mother liquor and a stripping aid to obtain polyurethane dry process mother liquor containing the stripping aid.

[0067] In the present invention, the raw materials of the polyurethane dry process mother liquor include the following components in parts by mass: 47.5 parts of polyurethane dry process resin slurry (30% solid content), 47.5 parts of dimethylformamide, and 5 parts of black flakes.

[0068] In the present invention, the mass percentage of the stripping agent in the polyurethane dry process mother liquor containing the stripping agent is preferably 1.5%.

[0069] In the present invention, the solid content of the polyurethane dry resin slurry is preferably 30%.

[0070] After obtaining the polyurethane dry process mother liquor containing the stripping agent, the present invention applies the polyurethane dry process mother liquor containing the stripping agent on velvet release paper, and forms a polyurethane film after first heating and curing.

[0071] In the present invention, the temperature of the first heating and curing is preferably 140° C., and the first heating and curing is preferably performed in an oven.

[0072] After the polyurethane film is formed, the present invention laminates the polyurethane film with a PU wet-process BASE or a base fabric, and after a second heating and curing, peels off the velvet release paper.

[0073] In the present invention, the temperature of the second heating and curing is preferably 140° C., and the second heating and curing is preferably performed in an oven.

[0074] In order to effectively improve the peeling effect of the stripping agent on velvet release paper, the present invention uses hexafluorobutyl acrylate to introduce fluorine-containing groups. Fluorine-containing groups can greatly reduce surface tension and improve the peeling effect. In addition, the present invention uses alkyl-terminated allyl polyether instead of uncapped ordinary allyl polyether. Since the raw material does not contain hydroxyl groups, the cross-linking of hydroxyl groups with the substrate - the surface material of the velvet release paper to produce substances that are not conducive to peeling is avoided. Finally, the present invention compounds a certain amount of dimethyl silicone oil and utilizes the lubricating effect of dimethyl silicone oil to enhance the peeling effect in one step. This product can solve the problem of velvet release paper being difficult to peel by adding only 1-2% of the weight of PU synthetic leather dry slurry, and can increase the use efficiency of release paper by more than 20 times. It not only does not affect the color development of the suede synthetic leather product, but can even improve the color development effect.

[0075] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0076] Example 1

[0077] 461.9 g of hydrogenated silicone oil with a hydrogen content of 0.05% and 38.1 g of hexafluorobutyl acrylate were added to a flask, nitrogen was introduced, and the temperature was raised to 110°C with stirring. 0.004 g of catalyst (chloroplatinic acid) was added, and the temperature was further raised to 140°C and kept in the reaction for 4 hours to obtain fluorinated silicone oil. 323.3 g of butyl-terminated allyl polyether with a molecular weight of 2000 and 0.004 g of catalyst (chloroplatinic acid) were then added, and the temperature was raised to 150°C and kept in the reaction for 3 hours to obtain fluorinated polyether silicone oil.

[0078] 800 g of the fluorinated polyether silicone oil, 100 g of dimethyl silicone oil, and 100 g of dimethylformamide were pre-dispersed uniformly using a disperser, and then processed using a homogenizer and a colloid mill for 2 hours to obtain the velvety release paper stripping agent, which was marked as A.

[0079] Example 2

[0080] 466.9 g of 0.1% hydrogen-containing silicone oil and 33.1 g of hexafluorobutyl acrylate were added to a flask, nitrogen was introduced, and the temperature was raised to 90°C with stirring. 0.001 g of catalyst (chloroplatinic acid) was added, and the temperature was further raised to 150°C and kept for reaction for 4 hours to obtain fluorinated silicone oil. 205.4 g of 400 molecular weight methyl-terminated allyl polyether and 0.0014 g of catalyst (chloroplatinic acid) were then added, and the temperature was raised to 150°C and kept for reaction for 3 hours to obtain fluorinated polyether silicone oil.

[0081] 800 g of the fluorinated polyether silicone oil, 150 g of dimethyl silicone oil, and 50 g of dimethylformamide were pre-dispersed uniformly using a disperser, and then processed using a homogenizer and a colloid mill for 1 hour to obtain the velvety release paper stripping agent, which was marked as B.

[0082] Example 3

[0083] 447.2 g of 0.1% hydrogen-containing silicone oil and 52.8 g of hexafluorobutyl acrylate were added to a flask, nitrogen was introduced, and the temperature was raised to 100°C with stirring. 0.002 g of catalyst (chloroplatinic acid) was added, and the temperature was further raised to 140°C and kept for reaction for 3 hours to obtain fluorinated silicone oil. 483.0 g of 1200 molecular weight methyl-terminated allyl polyether and 0.004 g of catalyst (chloroplatinic acid) were then added, and the temperature was raised to 140°C and kept for reaction for 2 hours to obtain fluorinated polyether silicone oil.

[0084] 900 g of the fluorinated polyether silicone oil, 50 g of dimethyl silicone oil, and 50 g of dimethylformamide were pre-dispersed uniformly using a disperser, and then processed using a homogenizer and a colloid mill for 1 hour to obtain the velvety release paper stripping agent, marked as C.

[0085] Comparative Example 1

[0086] The butyl-terminated allyl polyether with a molecular weight of 2000 in Example 1 was replaced with allyl polyether (unterminated) with a molecular weight of 2000, and the rest remained unchanged. A comparative sample was prepared according to the experimental method of Example 1 and marked as D.

[0087] Comparative Example 2

[0088] No butyl hexafluoroacrylate is used.

[0089] 641.0 g of hydrogenated silicone oil with a hydrogen content of 0.1%, 359.0 g of methyl-terminated allyl polyether with a molecular weight of 400, and 0.002 g of catalyst (chloroplatinic acid) were heated to 150° C. and kept warm for 3 hours to obtain alkyl-terminated polyether-modified silicone oil.

[0090] 800 g of the alkyl-terminated polyether-modified silicone oil was pre-dispersed uniformly with 150 g of dimethyl silicone oil and 50 g of dimethylformamide using a disperser, and then treated with a homogenizer and a colloid mill for 1 hour to obtain the velvety release paper stripping agent, which was marked as E.

[0091] Test Case

[0092] First, prepare the polyurethane dry process masterbatch according to the following formula in parts by mass:

[0093] 47.5 parts of polyurethane dry resin (solid content 30%);

[0094] 47.5 parts of dimethylformamide;

[0095] 5 portions of black tablets.

[0096] The stripping agent products A, B, C, D, and E prepared in the above three embodiments and two comparative examples were added to the above polyurethane dry process mother liquor to obtain polyurethane dry process mother liquors containing stripping agents, respectively. In the polyurethane dry process mother liquor containing stripping agents, the mass percentage of the stripping agent products prepared in the above three embodiments and two comparative examples was 1.5%, and the mixture was stirred evenly. Then, velvet-feeling release paper of the same type, the polyurethane dry process mother liquors with different stripping agents added, and the polyurethane dry process mother liquor without stripping agents were used respectively. The polyurethane synthetic leather dry process veneer process was repeatedly used to produce velvet-feeling synthetic leather. The effects of adding different stripping agent products on the number of times the velvet-feeling release paper was used were compared, as shown in Table 1:

[0097] Table 1 Comparison of the effects of different stripping agents on the number of times velvet release paper is used

[0098] Stripping aids A B C D E Not added Number of times velvet release paper is used 30 25 36 12 8 2

[0099] Conclusion: It can be concluded from Table 1 that without adding a stripping agent, the velvet release paper cannot be used again after two uses; after adding the products of the two comparative examples respectively, the number of uses of the velvet release paper is increased compared with the case without adding a stripping agent, but it is not ideal; after adding the velvet stripping agent products of the three embodiments of the present scheme respectively, the number of uses of the velvet release paper is significantly increased.

[0100] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A stripping agent composition, characterized in that Including fluorine-modified polyether silicone oil, dimethyl silicone oil and dimethylformamide; The preparation method of the fluorine-modified polyether silicone oil comprises the following steps: In a protective gas atmosphere, heating and mixing hydrogenated silicone oil, hexafluorobutyl acrylate, and a first inorganic platinum catalyst to carry out a modification reaction to obtain a reaction solution of fluorine-modified silicone oil, wherein the first inorganic platinum catalyst is chloroplatinic acid or chloroplatinic acid hexahydrate; In a protective gas atmosphere, mixing the reaction solution of the fluorine-modified silicone oil, an alkyl-terminated allyl polyether, and a second inorganic platinum catalyst to carry out an addition reaction to obtain the fluorine-modified polyether silicone oil, wherein the second inorganic platinum catalyst is chloroplatinic acid or chloroplatinic acid hexahydrate; The mass percentage of the dimethyl silicone oil to the mass percentage of the fluorine-modified polyether silicone oil is ≤15%; The mass percentage of the dimethylformamide to the mass percentage of the fluorine-modified polyether silicone oil is ≤10%.

2. The stripping agent composition according to claim 1, characterized in that The mass percentage of the dimethyl silicone oil to the mass percentage of the fluorine-modified polyether silicone oil is 5 to 15%; The mass percentage of the dimethylformamide to the mass percentage of the fluorine-modified polyether silicone oil is 5-10%.

3. The stripping agent composition according to claim 1, characterized in that The hydrogen content of the hydrogen-containing silicone oil is 0.05-0.1%; Calculated based on the amount of active hydrogen atoms on Si-H bonds in the hydrogen-containing silicone oil, the molar ratio of the hydrogen-containing silicone oil to the hexafluorobutyl acrylate is 1:(0.3-0.7).

4. The stripping agent composition according to claim 1, characterized in that The relative molecular mass of the alkyl-terminated allyl polyether is 400-2000, and the alkyl-terminated allyl polyether is methyl-terminated allyl polyether and / or butyl-terminated allyl polyether.

5. The stripping agent composition according to claim 1 or 4, characterized in that Calculated based on the amount of active hydrogen atoms on Si-H bonds in the hydrogen-containing silicone oil, the molar ratio of the hydrogen-containing silicone oil to the alkyl-terminated allyl polyether is 1:(0.7-1.1).

6. The stripping agent composition according to claim 1, characterized in that The mass of the first inorganic platinum catalyst accounts for 2 to 10 ppm of the total mass of the hydrogenated silicone oil and the hexafluorobutyl acrylate; The mass of the second inorganic platinum catalyst accounts for 2 to 10 ppm of the total mass of the hydrogenated silicone oil, the hexafluorobutyl acrylate and the alkyl-terminated allyl polyether.

7. The stripping agent composition according to claim 1, characterized in that The temperature of the modification reaction is 120-150° C., and the insulation time of the modification reaction is 2-4 hours; The temperature of the addition reaction is 130-150° C., and the insulation time of the addition reaction is 2-3 hours.

8. Use of the stripping aid composition according to any one of claims 1 to 7 in the stripping of velvet release paper for polyurethane dry-process synthetic leather.

9. The use according to claim 8, characterized in that The peeling of the velvet release paper for polyurethane dry-process synthetic leather comprises the following steps: Mixing the raw materials of the polyurethane dry process mother liquor and the stripping agent to obtain the polyurethane dry process mother liquor containing the stripping agent; The polyurethane dry process master solution containing a stripping agent is coated on the velvet release paper, and after the first heating and curing, a polyurethane film is formed; After the polyurethane film is laminated with the PU wet-process BASE or base fabric and subjected to a second heating and curing step, the velvet release paper is peeled off; The temperatures for the first heating and curing and the second heating and curing are both 140°C.