Smooth silicone oil PU resin and its preparation method and application

Abstract

The present application discloses a smooth silicone oil PU resin and its preparation method and application, and relates to the field of textile treatment agents. The smooth silicone oil PU resin comprises raw materials of a first polyether diol, a second polyether diol, a double-terminated alcohol hydroxyl long-chain alkyl silicone oil, an alcohol hydroxyl double-terminated silicone oil, a diisocyanate, a catalyst, acetone, a chain extender and water; the structural formula of the first polyether diol is HO[CH2CH2O] a CH2CH2CH2[Si(CH3)2O] b Si(CH3)2CH2CH2CH2O[CH2CH2O] a H; the structural formula of the second polyether diol is H[OCH2C(CH3)(CH2OCF2CF2CF3)CH2] c OH. The smooth silicone oil PU resin is used to post-finish the dyed textiles to obtain textiles with both stiffness and smoothness, and the stiffness and smoothness of the textiles can be maintained for a long time.

Description

Technical Field

[0001] The present application relates to the field of textile treatment agents, and in particular to a smooth silicone oil PU resin and a preparation method and application thereof. Background Art

[0002] In the textile production process, after the dyeing process, textiles usually need to go through a post-finishing step to stabilize their shape and give them a specific stiffness and smoothness to meet the diverse needs of the market and consumers.

[0003] At present, textiles are generally finished with amino-modified silicone oil, acrylate-modified silicone oil, polyurethane emulsion, etc. However, these existing finishing agents either give textiles stiffness or give textiles a smooth feeling. It is generally difficult to obtain textiles with both stiffness and smoothness through a finishing process. In addition, the effect obtained by the existing textile finishing will significantly decrease after multiple soap washings, and there is a problem of poor stability. Summary of the invention

[0004] In order to improve the problem in the related art that it is difficult to obtain textiles with both stiffness and smoothness through a post-finishing process, and at the same time improve the problem of poor stability of the effects obtained by textiles, the present application provides a stiff and smooth silicone oil PU resin and its preparation method and application.

[0005] The present application provides a smooth silicone oil PU resin adopts the following technical solution:

[0006] A smooth silicone oil PU resin is prepared from raw materials including 5-10 parts by weight of a first polyether diol, 18-25 parts by weight of a second polyether diol, 6.8-9.2 parts by weight of a double-terminated alcohol hydroxyl long-chain alkyl silicone oil, 4.6-7.8 parts by weight of alcohol hydroxyl double-terminated silicone oil, 18-20 parts by weight of a diisocyanate, 0.01-0.02 parts by weight of a catalyst, 20-25 parts by weight of acetone, 4-6 parts by weight of a chain extender and 28-32 parts by weight of water; the structural formula of the first polyether diol is HO[CH2CH2O] a CH2CH2CH2[Si(CH3)2O] b Si(CH3)2CH2CH2CH2O[CH2CH2O] a H, a ranges from 5 to 10, and b ranges from 15 to 20; the structural formula of the second polyether diol is H[OCH2C(CH3)(CH2OCF2CF2CF3)CH2] c The value range of OH,c is 1-5.

[0007] The smooth silicone oil PU resin in this application is obtained by reacting a first polyether diol of a specific structure, a second polyether diol of a specific structure, a double-terminated alcohol hydroxyl long-chain alkyl silicone oil, an alcohol hydroxyl double-terminated silicone oil with a diisocyanate to obtain an isocyanate-terminated polyurethane prepolymer, and then reacting with a chain extender. Among them, the smooth silicone oil PU resin is used to post-finish the dyed textiles, and a textile with both stiffness and smoothness can be obtained through a one-step post-finishing process. In addition, the smooth silicone oil PU resin has a strong bonding force with the textiles, is resistant to soap washing, and can be stably attached to the textiles, so that the performance obtained by the textile post-finishing can be maintained for a long time.

[0008] Preferably, in the first polyether diol, the value range of a is 5-6, and the value range of b is 15-18.

[0009] In the first polyether diol of the present application, the value range of a is 5-6, and the value range of b is 15-18, which is beneficial to improving the stability of the straight and smooth silicone oil PU resin. During the finishing process, the straight and smooth silicone oil PU resin is less affected by temperature and can be stably stored in a temperature range of 5-65°C for more than 6 months, thereby ensuring the stability of the textile during the finishing process and preventing the problem of unqualified finishing effects caused by the instability of the straight and smooth silicone oil PU resin.

[0010] Preferably, in the second polyether diol, the value of c is in the range of 3-5.

[0011] In the second polyether diol of the present application, the value range of c is 3-5, which is beneficial to the stable combination of the smooth silicone oil PU resin and the textile, and is also beneficial to further improve the stability of the smooth silicone oil PU resin.

[0012] Preferably, the structural formula of the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is HOR1Si(CH3)2[Si(CH3)2O] n [Si(CH3)(R2)O] m Si(CH3)2R1OH, wherein R1 is an alkyl group with a carbon number less than 5, R2 is a long-chain alkyl group with a carbon number in the range of 8-10, n is in the range of 3-5, and m is in the range of 25-30.

[0013] In the double-terminal alcohol hydroxyl long-chain alkyl silicone oil of the present application, R1 is an alkyl group with a carbon atom number less than 5, R2 is a long-chain alkyl group with a carbon atom number in the range of 8-10, the value range of n is 3-5, and the value range of m is 25-30, which can ensure that the stiffness and smoothness of the textile are improved at the same time, and is beneficial to improving the tensile resistance of the straight and smooth silicone oil PU resin, and is also beneficial to obtaining a stable straight and smooth silicone oil PU resin.

[0014] Preferably, the alcohol hydroxyl double-terminated silicone oil has a viscosity of 50-100 cst at 25°C.

[0015] In the present application, the viscosity of the alcohol hydroxyl double-terminated silicone oil at 25° C. is controlled at 50-100 cst, which is beneficial to further improve the stability of the smooth silicone oil PU resin.

[0016] Preferably, the chain extender comprises a carboxylic acid chain extender and an amine chain extender, and the weight ratio of the carboxylic acid chain extender to the amine chain extender is (3-4):1.

[0017] In the present application, the chain extender adopts a composition of a carboxylic acid chain extender and an amine chain extender in a weight ratio of (3-4):1, which is beneficial to further improve the bonding strength between the smooth silicone oil PU resin and the textile, and has a further promoting effect on improving the soap resistance of the smooth silicone oil PU resin.

[0018] Optionally, the carboxylic acid chain extender is at least one of dimethylol propionic acid and dimethylol butyric acid, and the amine chain extender is at least one of ethylenediamine and N,N-dihydroxy (diisopropyl) aniline.

[0019] Optionally, the diisocyanate is at least one of isophorone diisocyanate, diphenylmethane diisocyanate, and 2,4-toluene diisocyanate; and the catalyst is at least one of dibutyltin dilaurate and dibutyltin diacetate.

[0020] In the second aspect, the present application provides a method for preparing a smooth silicone oil PU resin using the following technical solution:

[0021] A method for preparing a smooth silicone oil PU resin comprises the following steps:

[0022] Dehydrate the first polyether diol, the second polyether diol, the double-terminated alcohol hydroxyl long-chain alkyl silicone oil, and the alcohol hydroxyl double-terminated silicone oil, heat it to 45-55°C, then add diisocyanate and a catalyst, heat it to 85-95°C under the protection of inert gas, stir and react for 2-3h, then add acetone to dilute, and obtain an isocyanate-terminated polyurethane prepolymer;

[0023] Add chain extender to isocyanate-terminated polyurethane prepolymer according to the ratio, continue to react for 1-1.5 hours, then add water, stir evenly, and remove acetone by vacuum to obtain smooth silicone oil PU resin.

[0024] The present application adopts the above method to prepare a smooth silicone oil PU resin, which is conducive to obtaining a smooth silicone oil PU resin with strong bonding with textiles, and is resistant to soap washing and can be stably attached to textiles. The textiles are finished with the smooth silicone oil PU resin to obtain a smooth feeling and stiffness, which can be maintained for a long time.

[0025] In the third aspect, the application of a smooth silicone oil PU resin provided by the present application adopts the following technical solution:

[0026] An application of a smooth silicone oil PU resin comprises the following steps:

[0027] The dyed textile is immersed in smooth silicone oil PU resin, and then rolled dry, with the rolling rate controlled at 75-80%. After the dipping and rolling steps are cycled 2-3 times, the textile is baked at a high temperature of 100-110° C. for 2-4 minutes.

[0028] The present application adopts the above method to perform post-finishing on the dyed textile, so as to obtain a textile having both smoothness and stiffness.

[0029] In summary, the technical solution of this application includes at least the following beneficial technical effects:

[0030] (1) The straight and smooth silicone oil PU resin in this application is obtained by reacting a first polyether diol of a specific structure, a second polyether diol of a specific structure, a double-terminal alcohol hydroxyl long-chain alkyl silicone oil, an alcohol hydroxyl double-terminated silicone oil with a diisocyanate to obtain an isocyanate-terminated polyurethane prepolymer, and then reacting with a chain extender. Among them, the straight and smooth silicone oil PU resin is used to post-finish the dyed textiles, and a textile with both stiffness and smoothness can be obtained through a one-step post-finishing process. In addition, the straight and smooth silicone oil PU resin has a strong bonding force with the textiles, is resistant to soap washing, and can stably adhere to the textiles, so that the performance obtained by the textile post-finishing can be maintained for a long time.

[0031] (2) In the double-terminal alcohol hydroxyl long-chain alkyl silicone oil of the present application, R1 is an alkyl group with a carbon number of less than 5, R2 is a long-chain alkyl group with a carbon number in the range of 8-10, the value range of n is 3-5, and the value range of m is 25-30, which can ensure that the stiffness and smoothness of the textile are improved at the same time, and is beneficial to improving the tensile strength of the smooth silicone oil PU resin, and is also beneficial to obtaining a stable smooth silicone oil PU resin. DETAILED DESCRIPTION

[0032] The present application is further described below in conjunction with specific experiments.

[0033] Example

[0034] [Example 1]

[0035] A smooth silicone oil PU resin, the raw materials used are as follows:

[0036] First polyether diol: 5 kg; in this embodiment, the structural formula of the first polyether diol is HO[CH2CH2O] 10 CH2CH2CH2[Si(CH3)2O] 15 Si(CH3)2CH2CH2CH2O[CH2CH2O] 10H (i.e. the value of a is 10 and the value of b is 15);

[0037] Second polyether diol: 25 kg; In this embodiment, the structural formula of the second polyether diol is H[OCH2C(CH3)(CH2OCF2CF2CF3)CH2]OH (ie, the value of c is 1);

[0038] Double-terminal alcohol hydroxyl long-chain alkyl silicone oil: 6.8 kg; in this embodiment, the structural formula of the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is HOR1Si(CH3)2[Si(CH3)2O] n [Si(CH3)(R2)O] m Si(CH3)2R1OH, wherein R1 is propyl, R2 is octyl, the value of n is 3, and the value of m is 30.

[0039] Alcohol hydroxyl double-terminated silicone oil: 7.8 kg; in this embodiment, the alcohol hydroxyl double-terminated silicone oil adopts dihydroxypropyl-terminated silicone oil, and the viscosity of the dihydroxypropyl-terminated silicone oil is 50 cst;

[0040] Diisocyanate: 18 kg; in this embodiment, the diisocyanate is isophorone diisocyanate;

[0041] Catalyst: 0.01 kg; in this embodiment, the catalyst is specifically dibutyltin dilaurate;

[0042] Chain extender: 4 kg; in this embodiment, the chain extender is specifically ethylenediamine;

[0043] Acetone: 20kg;

[0044] Water: 28kg.

[0045] A method for preparing a smooth silicone oil PU resin comprises the following steps:

[0046] Dehydrate the first polyether diol, the second polyether diol, the double-terminated alcohol hydroxyl long-chain alkyl silicone oil, and the alcohol hydroxyl double-terminated silicone oil, heat it to 45°C, then add diisocyanate and a catalyst, heat it to 85°C under nitrogen protection, stir and react for 3 hours, then add acetone to dilute, and obtain an isocyanate-terminated polyurethane prepolymer;

[0047] Add chain extender to isocyanate-terminated polyurethane prepolymer according to the ratio, continue the reaction for 1.5 hours, then add water, stir evenly, remove acetone by vacuum, and obtain smooth silicone oil PU resin.

[0048] [Example 2]

[0049] A smooth silicone oil PU resin, the raw materials used are as follows:

[0050] First polyether diol: 10 kg; in this embodiment, the structural formula of the first polyether diol is HO[CH2CH2O]5CH2CH2CH2[Si(CH3)2O] 20 Si(CH3)2CH2CH2CH2O[CH2CH2O]5H (i.e. the value of a is 5 and the value of b is 20);

[0051] Second polyether diol: 18 kg; In this embodiment, the structural formula of the second polyether diol is H[OCH2C(CH3)(CH2OCF2CF2CF3)5CH2]OH (ie, the value of c is 5);

[0052] Double-terminal alcohol hydroxyl long-chain alkyl silicone oil: 9.2 kg; in this embodiment, the structural formula of the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is HOR1Si(CH3)2[Si(CH3)2O] n [Si(CH3)(R2)O] m Si(CH3)2R1OH, wherein R1 is propyl, R2 is decyl, the value of n is 5, and the value of m is 25.

[0053] Alcohol hydroxyl double-terminated silicone oil: 4.6 kg; in this embodiment, the alcohol hydroxyl double-terminated silicone oil adopts dihydroxypropyl-terminated silicone oil, and the viscosity of the dihydroxypropyl-terminated silicone oil is 100 cst;

[0054] Diisocyanate: 20 kg; in this embodiment, the diisocyanate is isophorone diisocyanate;

[0055] Catalyst: 0.02 kg; in this embodiment, the catalyst is specifically dibutyltin dilaurate;

[0056] Chain extender: 6 kg; in this embodiment, the chain extender is trimethylolbutyric acid;

[0057] Acetone: 25kg;

[0058] Water: 32kg.

[0059] A method for preparing a smooth silicone oil PU resin comprises the following steps:

[0060] After dehydrating the first polyether diol, the second polyether diol, the double-terminated alcohol hydroxyl long-chain alkyl silicone oil, and the alcohol hydroxyl double-terminated silicone oil, the temperature is raised to 55° C., and then a diisocyanate and a catalyst are added, and the temperature is raised to 95° C. under nitrogen protection, and the mixture is stirred for reaction for 2 hours, and then acetone is added for dilution to obtain an isocyanate-terminated polyurethane prepolymer;

[0061] Add chain extender to isocyanate-terminated polyurethane prepolymer according to the ratio, continue the reaction for 1 hour, then add water, stir evenly, remove acetone by vacuum, and obtain smooth silicone oil PU resin.

[0062] [Example 3]

[0063] A smooth silicone oil PU resin, which is different from [Example 1] in that the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is different.

[0064] In this embodiment, the structural formula of the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is HOR1Si(CH3)2[Si(CH3)2O] n [Si(CH3)(R2)O] m Si(CH3)2R1OH, wherein R1 is propyl, R2 is octyl, the value of n is 3, and the value of m is 10.

[0065] [Example 4]

[0066] A smooth silicone oil PU resin, which is different from [Example 1] in that the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is different.

[0067] In this embodiment, the structural formula of the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is HOR1Si(CH3)2[Si(CH3)2O] n [Si(CH3)(R2)O] m Si(CH3)2R1OH, wherein R1 is propyl, R2 is octyl, the value of n is 3, and the value of m is 45.

[0068] Comparative Example

[0069] [Comparative Example 1]

[0070] A smooth silicone oil PU resin, which differs from [Example 1] in that the structural formula of the first polyether diol is HO[CH2CH2O]2CH2CH2CH2[Si(CH3)2O]5Si(CH3)2CH2CH2CH2O[CH2CH2O]2H (that is, the value of a is 2 and the value of b is 5).

[0071] [Comparative Example 2]

[0072] A smooth silicone oil PU resin, which is different from [Example 1] in that the structural formula of the second polyether diol is H[OCH2C(CH3)(CH2OCF2CF2CF3) 15 CH2]OH (i.e. the value of c is 15).

[0073] [Comparative Example 3]

[0074] A smooth silicone oil PU resin, which differs from [Example 1] in that the double-terminal hydroxyl long-chain alkyl silicone oil is replaced by an equal amount of dihydroxypropyl terminated silicone oil.

[0075] [Comparative Example 4]

[0076] A smooth silicone oil PU resin, which differs from [Example 1] in that the alcohol hydroxyl double-terminated silicone oil is replaced by an equal amount of alcohol hydroxyl double-terminated long-chain alkyl silicone oil.

[0077] Application Examples

[0078]

Application Example 1

[0079] An application of a smooth silicone oil PU resin is used in a finishing process of textiles after dyeing, and the finishing process includes the following steps:

[0080] The dyed cotton textile was immersed in the smooth silicone oil PU resin prepared in [Example 1], followed by rolling and drying, with the rolling rate controlled at 78%. After the dipping and rolling steps were repeated twice, the textile was baked at 105°C for 3 minutes.

[0081]

Application Example 2

[0082] An application of a smooth silicone oil PU resin is used in a finishing process of textiles after dyeing, and the finishing process includes the following steps:

[0083] The dyed cotton textile was immersed in the smooth silicone oil PU resin prepared in [Example 2], followed by rolling and drying, with the rolling rate controlled at 78%. After the dipping and rolling steps were repeated twice, the textile was baked at 105°C for 3 minutes.

[0084]

Application Example 3

[0085] An application of a smooth silicone oil PU resin is used in a finishing process of textiles after dyeing, and the finishing process includes the following steps:

[0086] The dyed cotton textile was immersed in the smooth silicone oil PU resin prepared in [Example 3], and then rolled dry. The rolling rate was controlled at 78%. After the dipping and rolling steps were repeated twice, the textile was baked at a high temperature of 105°C for 3 minutes.

[0087]

Application example 4

[0088] An application of a smooth silicone oil PU resin is used in a finishing process of textiles after dyeing, and the finishing process includes the following steps:

[0089] The dyed cotton textile was immersed in the smooth silicone oil PU resin prepared in [Example 4], followed by rolling and drying, with the rolling rate controlled at 78%. After the dipping and rolling steps were repeated twice, the textile was baked at 105°C for 3 minutes.

[0090] Comparative Application Examples

[0091]

Comparative Application Example 1

[0092] An application of a smooth silicone oil PU resin is used in a finishing process of textiles after dyeing, and the finishing process includes the following steps:

[0093] The dyed cotton textile was immersed in the smooth silicone oil PU resin prepared in [Comparative Example 1], and then rolled dry with the rolling rate controlled at 78%. After the dipping and rolling steps were repeated twice, the textile was baked at a high temperature of 105°C for 3 minutes.

[0094]

Comparative Application Example 2

[0095] An application of a smooth silicone oil PU resin is used in a finishing process of textiles after dyeing, and the finishing process includes the following steps:

[0096] The dyed cotton textile was immersed in the smooth silicone oil PU resin prepared in [Comparative Example 2], and then rolled dry with the rolling rate controlled at 78%. After the dipping and rolling steps were repeated twice, the textile was baked at a high temperature of 105°C for 3 minutes.

[0097]

Comparative Application Example 3

[0098] An application of a smooth silicone oil PU resin is used in a finishing process of textiles after dyeing, and the finishing process includes the following steps:

[0099] The dyed cotton textile was immersed in the smooth silicone oil PU resin prepared in [Comparative Example 3], and then rolled dry with the rolling rate controlled at 78%. After the dipping and rolling steps were repeated twice, the textile was baked at a high temperature of 105°C for 3 minutes.

[0100]

Comparative Application Example 4

[0101] An application of a smooth silicone oil PU resin is used in a finishing process of textiles after dyeing, and the finishing process includes the following steps:

[0102] The dyed cotton textile was immersed in the smooth silicone oil PU resin prepared in [Comparative Example 4], and then rolled dry with the rolling rate controlled at 78%. After the dipping and rolling steps were repeated twice, the textile was baked at a high temperature of 105°C for 3 minutes.

[0103] Performance testing

[0104] Stiffness scoring: 10 professionals in the textile field were organized as judges to score the stiffness of the cotton textiles obtained in each application example and comparative application example. The scores were divided into 10 scores of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. The higher the score, the better the stiffness. Among them, 50 cotton textiles were randomly selected from each application example and comparative application example, and each judge scored 5 cotton textiles in each application example and comparative application example. After calculating the average score of each judge on the cotton textile, the average score of the 10 judges on the stiffness of the cotton textiles in each embodiment and comparative application example was calculated, and the average score of the 10 judges was recorded in the following Table 1.

[0105] Smoothness score: 10 professionals in the textile field were organized as judges to score the smoothness of the cotton textiles obtained in each application example and comparative application example. The score was divided into 10 scores of 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10. The higher the score, the better the smoothness. Among them, 50 cotton textiles were randomly selected from each application example and comparative application example, and each judge scored 5 cotton textiles in each application example and comparative application example. After calculating the average score of each judge on the cotton textile, the average score of the 10 judges on the smoothness of the cotton textiles in each embodiment and comparative application example was calculated, and the average score of the 10 judges was recorded in the following Table 1.

[0106] Washing resistance: The cotton fabrics obtained in each application example and comparative application example were soap washed, and after soap washing 100 times, they were scored again according to the above-mentioned scoring method for stiffness and smoothness, and the results were recorded in the following Table 1. Among them, the judges remained unchanged, and the cotton fabrics were soap washed according to the test method B specified in GB / T 3921-2008 "Textiles - Tests for Colour Fastness - Colour Fastness to Soap Washing" (soap washing temperature 45°C, soap washing time each time 45 minutes). The smaller the difference in the scores of stiffness and smoothness of the cotton fabric before and after soap washing, the more stable the performance of the cotton fabric in the corresponding application example or comparative application example.

[0107] Tensile stability: The cotton textiles obtained in each application example and comparative application example were stretched, the stretching length was 40% of the natural length of the cotton textile, and the stretching duration was 72 hours and 168 hours. After the tensile test, the surface of the cotton textile was observed to see if there were cracks, and the results were recorded in the following Table 2. If there were no cracks, it means that the coating formed by the finishing agent on the surface of the cotton textile had good tensile stability.

[0108] Stability of the smooth silicone oil PU resin: The stability of the smooth silicone oil PU resin was tested by a centrifuge accelerated sedimentation test. Specifically, the smooth silicone oil PU resin prepared in each embodiment and the comparative example was put into a centrifuge, and the smooth silicone oil PU resin was centrifuged at a speed of 5000r / min. After 15 minutes, the smooth silicone oil PU resin was observed to see whether stratification occurred, and the results were recorded in the following Table 3, where the easier it was to stratify, the worse the stability of the smooth silicone oil PU resin.

[0109] Table 1

[0110]

[0111] Table 2

[0112]

[0113]

[0114] Table 3

[0115]

[0116] In combination with Example 1, Comparative Examples 1-4, Application Example 1, Comparative Application Examples 1-4 and the test results in Table 1 above, it can be seen that when the smooth silicone oil PU resin in Example 1 is used to post-finish textiles, textiles with both stiffness and smoothness can be obtained. At the same time, the smooth silicone oil PU resin has a strong bonding force with the textiles, is resistant to soap washing, and can be stably attached to the textiles, so that the stiffness and smoothness obtained by the post-finishing of the textiles can be maintained for a long time.

[0117] The difference between the smooth silicone oil PU resin in Comparative Example 1 and the smooth silicone oil PU resin in Example 1 is that in the first polyether diol, the value ranges of a and b are not within the scope of the present application. Combined with the results in Tables 1-3, it can be seen that when the value ranges of a and b in the first polyether diol are not within the scope of the present application, the stiffness and smoothness of the textile after finishing are reduced, and the tensile properties of the smooth silicone oil PU resin are reduced.

[0118] The difference between the smooth silicone oil PU resin in Comparative Example 2 and the smooth silicone oil PU resin in Example 1 is that in the second polyether diol, the value range of c is not within the scope of the present application. Combined with the results in Tables 1-3, it can be seen that when the value range of c in the second polyether diol is not within the scope of the present application, the binding force between the smooth silicone oil PU resin and the textile is weakened or the soap washing resistance is deteriorated, resulting in the inability to maintain the stiffness and smoothness obtained by the textile post-finishing for a long time. At the same time, the tensile properties of the smooth silicone oil PU resin are reduced, and the stability of the smooth silicone oil PU resin is also reduced.

[0119] The difference between the smooth silicone oil PU resin in Comparative Example 3 and the smooth silicone oil PU resin in Example 1 is that the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is replaced by an equal amount of dihydroxypropyl end-capped silicone oil. Combining the results in Tables 1-3, it can be seen that after the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is replaced by an equal amount of dihydroxypropyl end-capped silicone oil, the stiffness and smoothness of the textile after finishing are significantly reduced.

[0120] The difference between the smooth silicone oil PU resin in Comparative Example 4 and the smooth silicone oil PU resin in Example 1 is that the alcohol hydroxyl double-terminated silicone oil is replaced by an equal amount of double-terminated alcohol hydroxyl long-chain alkyl silicone oil. Combining the results in Tables 1-3, it can be seen that after the alcohol hydroxyl double-terminated silicone oil is replaced by an equal amount of double-terminated alcohol hydroxyl long-chain alkyl silicone oil, the binding force of the smooth silicone oil PU resin with the textile is weakened or the soap washing resistance is deteriorated, resulting in the inability to maintain the stiffness and smoothness obtained by the textile post-finishing for a long time. At the same time, the tensile properties of the smooth silicone oil PU resin are reduced, and the stability of the smooth silicone oil PU resin is also reduced.

[0121] In combination with Example 1, Example 3-4 and Application Example 1, Application Example 3-4 and the test results in Tables 1-3 above, it can be seen that the difference between Examples 1, 3, and 4 is that in the smooth silicone oil PU resin, the value of m in the double-terminal hydroxyl long-chain alkyl silicone oil is different. In combination with the results in Tables 1-3, it can be seen that the value of n in the double-terminal hydroxyl long-chain alkyl silicone oil is in the range of 3-5, and the value of m is in the range of 25-30, which can ensure that the stiffness and smoothness of the textile are improved at the same time, and the stiffness and smoothness of the textile can be maintained for a long time. At the same time, the smooth silicone oil PU resin has both excellent tensile properties and stability.

[0122] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A smooth silicone oil PU resin, characterized by: The invention is prepared from raw materials including 5-10 parts by weight of a first polyether diol, 18-25 parts by weight of a second polyether diol, 6.8-9.2 parts by weight of a double-terminated alcohol hydroxyl long-chain alkyl silicone oil, 4.6-7.8 parts by weight of alcohol hydroxyl double-terminated silicone oil, 18-20 parts by weight of a diisocyanate, 0.01-0.02 parts by weight of a catalyst, 20-25 parts by weight of acetone, 4-6 parts by weight of a chain extender and 28-32 parts by weight of water; the structural formula of the first polyether diol is HO[CH2CH2O] a CH2CH2CH2[Si(CH3)2O] b Si(CH3)2CH2CH2CH2O[CH2CH2O] a H, a ranges from 5 to 10, and b ranges from 15 to 20; the structural formula of the second polyether diol is H[OCH2C(CH3)(CH2OCF2CF2CF3)CH2] c OH, c ranges from 1 to 5; The structural formula of the double-terminal alcohol hydroxyl long-chain alkyl silicone oil is HOR1Si(CH3)2[Si(CH3)2O] n [Si(CH3)(R2)O] m Si(CH3)2R1OH, wherein R1 is an alkyl group having less than 5 carbon atoms, R2 is a long-chain alkyl group having 8-10 carbon atoms, n is in the range of 3-5, and m is in the range of 25-30; The viscosity of the alcohol hydroxyl double-terminated silicone oil at 25° C. is 50-100 cst.

2. A smooth silicone oil PU resin according to claim 1, characterized in that: In the first polyether diol, the value range of a is 5-6, and the value range of b is 15-18.

3. A smooth silicone oil PU resin according to claim 1, characterized in that: In the second polyether diol, the value range of c is 3-5.

4. A smooth silicone oil PU resin according to claim 1, characterized in that: The chain extender includes a carboxylic acid chain extender and an amine chain extender, and the weight ratio of the carboxylic acid chain extender to the amine chain extender is (3-4):

1.

5. A smooth silicone oil PU resin according to claim 4, characterized in that: The carboxylic acid chain extender is at least one of dimethylol propionic acid and dimethylol butyric acid, and the amine chain extender is at least one of ethylenediamine and N,N-dihydroxy (diisopropyl) aniline.

6. A smooth silicone oil PU resin according to claim 1, characterized in that: The diisocyanate is at least one of isophorone diisocyanate, diphenylmethane diisocyanate and 2,4-toluene diisocyanate; the catalyst is at least one of dibutyltin dilaurate and dibutyltin diacetate.

7. A method for preparing a smooth silicone oil PU resin according to any one of claims 1 to 6, characterized in that: The following steps are involved: The first polyether diol, the second polyether diol, the double-terminal hydroxyl long-chain alkyl silicone oil, the alcohol hydroxyl After the diisocyanate-terminated silicone oil is dehydrated, the temperature is raised to 45-55°C, and then diisocyanate and catalyst are added, and the temperature is raised to 85-95°C under the protection of inert gas, and the reaction is stirred for 2-3 hours, and then acetone is added to dilute it to obtain an isocyanate-terminated polyurethane prepolymer; Add chain extender to isocyanate-terminated polyurethane prepolymer according to the ratio, continue to react for 1-1.5 hours, then add water, stir evenly, and remove acetone by vacuum to obtain smooth silicone oil PU resin.

8. The use of a smooth silicone oil PU resin according to any one of claims 1 to 6, characterized in that: Used in the post-finishing process of textiles after dyeing, the post-finishing process comprises the following steps: The dyed textile is immersed in smooth silicone oil PU resin, then rolled dry, and the rolling rate is controlled within 75-80%, after 2-3 cycles of dipping and rolling, bake at 100-110℃ for 2-4min.

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