Amino silicone oil softening agent as well as preparation method and application thereof

Abstract

The invention provides an amino silicone oil softening agent and a preparation method and application thereof, the preparation method comprises the following steps: firstly, reacting alpha, omega-hydroxyl polydimethylsiloxane with an amino silane coupling agent in the presence of a catalyst to obtain active silicone oil; then reacting the obtained active silicone oil with epoxy-terminated polyether silicone oil in an organic solvent to obtain block polyether amino silicone oil; and finally, mixing the obtained block polyether amino silicon oil with an emulsifier, and then adding a pH regulator and water to successfully obtain the amino silicon oil softener. According to the preparation method, through a specific reaction path, a block polyether structure is successfully introduced into amino silicon oil, so that the obtained amino silicon oil softening agent is easy to emulsify, has excellent emulsion stability and hydrophilicity, and can remarkably improve the softness, hydrophilicity, air permeability and yellowing resistance of fabrics; and the preparation method also has the characteristics of simple process, low cost, suitability for large-scale industrial production and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of emulsions, and particularly relates to an amino silicone softener, a preparation method thereof, and an application thereof. Background Art

[0002] Textiles are necessities in people's daily lives. Soft finishing is an important link in the post-treatment of base fabrics, which directly determines the softness, smoothness, and draping effect of the base fabrics. The mechanism of action of softeners refers to the directional adsorption of softeners and fibers, reducing the interfacial tension of fibers, reducing the frictional resistance between fibers and between fibers and the human body, so that the base fabric obtains a soft hand feeling.

[0003] Currently, commonly used softeners mainly include sulfate anionic surfactants, paraffin wax, natural oils, and silicone softeners; among them, silicone softeners have excellent softening properties, and at the same time they have the advantages of non-toxicity, pollution-free, and low cost, so they have become the most commonly used softeners in the industry at present. The silicone softeners used in early fabric finishing were generally dimethyl silicone oil and hydroxyl silicone oil, and the hand feeling of the fabric and the stability of the softener needed to be improved; subsequently, active groups were introduced into hydrogen-containing silicone oil and methyl silicone oil for modification treatment, so that the fabric has good softness, bactericidal property, hygroscopicity, and flame retardancy; among them, amino silicone oil is the most common silicone softener in the textile printing and dyeing market, and is also known as the "king of softeners".

[0004] However, traditional amino silicone oils have deficiencies in terms of air permeability, emulsion stability, and anti-yellowing properties. With the development of the times, the market has higher requirements for high-performance textile auxiliaries.

[0005] Therefore, developing a preparation method for an amino silicone softener that can be easily emulsified and has excellent stability and anti-yellowing properties is an urgent technical problem to be solved in this field. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an amino silicone softener, a preparation method thereof, and an application thereof. The preparation method enables the obtained amino silicone softener to be easily emulsified, easy for industrial production, and has excellent emulsion stability and hydrophilicity, and can significantly improve the softness, hydrophilicity, air permeability, and anti-yellowing properties of fabrics.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] In the first aspect, the present invention provides a preparation method for an amino silicone softener, and the preparation method includes the following steps:

[0009] (1) Mix α,ω-hydroxy polydimethylsiloxane and an amino silane coupling agent, add a catalyst and react to obtain an active silicone oil;

[0010] (2) React the active silicone oil obtained in step (1) and the terminal epoxy polyether silicone oil in an organic solvent to obtain a block polyether amino silicone oil;

[0011] (3) Mix the block polyether amino silicone oil obtained in step (2) with an emulsifier, add a pH regulator and water for mixing to obtain the amino silicone oil softener.

[0012] The preparation method of the amino silicone oil softener provided by the present invention first reacts α,ω-hydroxy polydimethylsiloxane and an amino silane coupling agent in the presence of a catalyst, and the two can undergo a polymerization reaction to obtain an active silicone oil; then react the obtained active silicone oil and the terminal epoxy polyether silicone oil in an organic solvent, and the two can undergo a ring-opening reaction to obtain a block polyether amino silicone oil; finally, mix the obtained block polyether amino silicone oil with an emulsifier, and then add a pH regulator and water for mixing to successfully obtain an amino silicone oil softener with active groups; the preparation method introduces a block polyether group into the amino silicone oil through a specific reaction path, and with further optimization of the reaction conditions, the finally obtained amino silicone oil softener is easy to emulsify and easy for industrial production, and at the same time has excellent emulsion stability and hydrophilicity, and can significantly improve the softness, hydrophilicity, air permeability and anti-yellowing property of fabrics.

[0013] Preferably, the mass ratio of the α,ω-hydroxy polydimethylsiloxane, the amino silane coupling agent and the catalyst in step (1) is (300-350):(20-35):(0.25-0.5), such as 300:20:0.25, 310:22:0.3, 320:24:0.35, 330:28:0.4, 340:32:0.45 or 350:34:0.5, etc.

[0014] Preferably, the amino silane coupling agent in step (1) includes any one or a combination of at least two of 3-divinyltriaminopropyltrimethoxysilane, N-2-aminoethyl-3-aminopropyltrimethoxysilane, N,N-dimethyl-3-aminopropyltrimethoxysilane or 3-aminopropyltrimethoxysilane.

[0015] Preferably, the catalyst in step (1) is a basic catalyst.

[0016] In the present invention, the basic catalyst can be added in the form of an aqueous solution of the basic catalyst, and the mass fraction of the aqueous solution of the basic catalyst can be 10-90%, such as 20%, 40%, 60%, 80%, or 90%, etc.

[0017] Preferably, the basic catalyst includes any one or a combination of at least two of potassium hydroxide, ammonium hydroxide or tetramethylammonium hydroxide.

[0018] Preferably, the temperature of the reaction in step (1) is 70-120 °C, such as 70 °C, 75 °C, 80 °C, 85 °C, 90 °C, 95 °C, 100 °C, 105 °C, 110 °C, 115 °C or 120 °C, etc.

[0019] Preferably, the reaction time in step (1) is 4-7 h, such as 4 h, 4.5 h, 5 h, 5.5 h, 6 h, 6.5 h or 7 h, etc.

[0020] Preferably, the mass ratio of the active silicone oil to the terminal epoxy polyether silicone oil in step (2) is (220-250):(30-43), such as 220:30, 225:32, 230:34, 235:36, 240:38 or 250:42, etc.

[0021] Preferably, the terminal epoxy polyether silicone oil in step (2) includes allyl polyoxyethyl polyoxypropyl epoxy ether.

[0022] Preferably, the organic solvent in step (2) includes isopropanol.

[0023] Preferably, the temperature of the reaction in step (2) is 60-80 °C, such as 60 °C, 62 °C, 65 °C, 66 °C, 68 °C, 70 °C, 72 °C, 74 °C, 76 °C, 78 °C or 80 °C, etc.

[0024] Preferably, the reaction time in step (2) is 6-8 h, such as 6 h, 6.2 h, 6.4 h, 6.6 h, 6.8 h, 7 h, 7.2 h, 7.4 h, 7.6 h, 7.8 h or 8 h, etc.

[0025] Preferably, the mass ratio of the block polyether amino silicone oil, emulsifier, pH regulator and water in step (3) is (10-35):(4-10):(0.1-1):(50-75), such as 10:4:0.1:50, 12:5:0.2:55, 15:6:0.4:60, 20:7:0.6:65, 25:8:0.7:70, 30:25:9:72 or 35:10:1:75, etc.

[0026] Preferably, the emulsifier in step (3) includes decyl alcohol polyoxyethylene ether and isomeric tridecyl alcohol polyoxyethylene ether.

[0027] Preferably, the mass ratio of the decyl alcohol polyoxyethylene ether to the isomeric tridecyl alcohol polyoxyethylene ether is (2-10):(2-15), such as 2:2, 3:4, 4:6, 4.5:8, 5:10, 5.5:12 or 6:14, etc.

[0028] Preferably, the pH regulator in step (3) includes glacial acetic acid.

[0029] In the present invention, the glacial acetic acid can be added in the form of an aqueous glacial acetic acid solution, and the mass fraction of the aqueous glacial acetic acid solution can be 20-50%, such as 20%, 25%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48% or 50%, etc.

[0030] Preferably, the pH value of the emulsion obtained after adding the pH regulator and water for mixing in step (3) is 4-6, such as 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2, 5.4, 5.6, 5.8 or 6, etc.

[0031] As a preferred technical solution of the present invention, the preparation method includes the following steps:

[0032] (1) Mix α,ω-hydroxy polydimethylsiloxane and an amino silane coupling agent uniformly under stirring, heat up to 70-120 °C, add a catalyst and react for 4-7 h to obtain an active silicone oil;

[0033] (2) Cool the system to 60-80 °C, and react the active silicone oil obtained in step (1) and a terminal epoxy polyether silicone oil in an organic solvent for 6-8 h to obtain a block polyether amino silicone oil;

[0034] (3) Mix the block polyether amino silicone oil obtained in step (2) and an emulsifier uniformly, add a pH regulator and water to adjust the pH value of the system to 4-6 to obtain the amino silicone softener.

[0035] In the second aspect, the present invention provides an amino silicone softener, which is prepared by the preparation method as described in the first aspect.

[0036] Preferably, the emulsion particle size of the amino silicone softener is 30-50 nm, such as 30 nm, 32 nm, 34 nm, 36 nm, 38 nm, 40 nm, 42 nm, 44 nm, 46 nm, 48 nm or 50 nm, etc.

[0037] Preferably, the pH value of the amino silicone softener is 4-6, such as 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2, 5.4, 5.6, 5.8 or 6, etc.

[0038] In the third aspect, the present invention provides an application of the amino silicone softener as described in the second aspect in textile softening treatment.

[0039] In the fourth aspect, the present invention provides a fabric, which is obtained by soft finishing with the amino silicone softener as described in the third aspect.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] (1) The preparation method of the amino silicone softener provided by the present invention introduces a block polyether structure as an active group into the amino silicone through a specific reaction path, and with further optimization of the reaction conditions, the finally obtained amino silicone softener is easy to emulsify and suitable for industrial production. At the same time, it also has excellent emulsion stability and hydrophilicity, and can significantly improve the softness, hydrophilicity, air permeability and anti-yellowing property of fabrics.

[0042] (2) In addition, the preparation method of the amino silicone softener provided by the present invention also has the characteristics of simple process, low cost, and suitability for large-scale industrial production, and is particularly suitable for the soft post-treatment of fiber fabrics and various industrial applications. Specific Embodiments

[0043] The technical solutions of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0044] Unless otherwise specified, the raw materials involved in the following specific embodiments are conventional materials in the art and can all be obtained by purchasing commercially available products.

[0045] Example 1

[0046] A preparation method of an amino silicone softener specifically includes the following steps:

[0047] (1) Add 300 g of α,ω-hydroxy polydimethylsiloxane and 28.2 g of 3-divinyltriaminopropyltrimethoxysilane into a three-necked flask equipped with a stirrer and a reflux device, heat up to 120 °C, and add 0.5 g of an aqueous potassium hydroxide solution with a concentration of 50% and react for 5 h to obtain an active silicone oil;

[0048] (2) Cool down to 80 °C, and carry out a stirring reflux reaction for 6 h on 237 g of the active silicone oil obtained in step (1) and 32.8 g of allyl polyoxyethyl polyoxypropyl epoxy ether in 100 mL of isopropanol. After the reaction, a colorless and transparent block polyether amino silicone oil is obtained;

[0049] (3) Mix 90 g of the block polyether amino silicone oil obtained in step (2), 5 g of decanol polyoxyethylene ether and 10 g of isomeric tridecanol polyoxyethylene evenly, add 1.9 g of an aqueous acetic acid solution with a concentration of 20% and 239 g of water, and then continue to stir to ensure that the pH value of the emulsion is 4-6 to obtain the amino silicone softener.

[0050] Example 2

[0051] A preparation method of an amino silicone softener, specifically including the following steps:

[0052] (1) Add 310 g of α,ω-hydroxy polydimethylsiloxane and 35 g of N-2-aminoethyl-3-aminopropyltrimethoxysilane into a three-necked flask equipped with a stirrer and a reflux device, heat up to 105 °C, add 0.48 g of ammonium hydroxide and react for 4 h to obtain an active silicone oil;

[0053] (2) Cool down to 70 °C, and carry out a stirring reflux reaction for 7 h on 228.7 g of the active silicone oil obtained in step (1) and 36.2 g of allyl polyoxyethyl polyoxypropyl epoxy ether in 120 mL of isopropanol. After the reaction is completed, a colorless and transparent block polyether amino silicone oil is obtained;

[0054] (3) Mix 105 g of the block polyether amino silicone oil obtained in step (2), 8 g of decyl alcohol polyoxyethylene ether and 12 g of isomeric tridecyl alcohol polyoxyethylene evenly, add 0.9 g of 50% acetic acid aqueous solution and 265 g of water, and then continue to stir to ensure that the pH value of the emulsion is 4 - 6 to obtain the amino silicone softener.

[0055] Example 3

[0056] A preparation method of an amino silicone softener, specifically including the following steps:

[0057] (1) Add 315 g of α,ω-hydroxy polydimethylsiloxane and 22.7 g of N,N-dimethyl-3-aminopropyltrimethoxysilane into a three-necked flask equipped with a stirrer and a reflux device, heat up to 100 °C, add 0.5 g of ammonium hydroxide and react for 7 h to obtain an active silicone oil;

[0058] (2) Cool down to 75 °C, and carry out a stirring reflux reaction for 8 h on 222 g of the active silicone oil obtained in step (1) and 38 g of allyl polyoxyethyl polyoxypropyl epoxy ether in 90 mL of isopropanol. After the reaction is completed, a colorless and transparent block polyether amino silicone oil is obtained;

[0059] (3) Mix 80 g of the block polyether amino silicone oil obtained in step (2), 6.5 g of decyl alcohol polyoxyethylene ether and 14 g of isomeric tridecyl alcohol polyoxyethylene evenly, add 1.75 g of 20% acetic acid aqueous solution and 250 g of water, and then continue to stir to ensure that the pH value of the emulsion is 4 - 6 to obtain the amino silicone softener.

[0060] Example 4

[0061] A preparation method of an amino silicone softener, specifically including the following steps:

[0062] (1) Add 305 g of α,ω-hydroxy polydimethylsiloxane and 32 g of N,N-dimethyl-3-aminopropyltrimethoxysilane into a three-necked flask equipped with a stirrer and a reflux device. Heat up to 90 °C, add 0.48 g of 60% potassium hydroxide aqueous solution and react for 6.5 h to obtain active silicone oil;

[0063] (2) Cool down to 80 °C, and carry out a stirring reflux reaction for 6.5 h with 220 g of the active silicone oil obtained in step (1) and 33 g of allyl polyoxyethyl polyoxypropyl epoxy ether in 105 mL of isopropanol. After the reaction, a colorless and transparent block polyether amino silicone oil is obtained;

[0064] (3) Mix 90 g of the block polyether amino silicone oil obtained in step (2), 10 g of decyl alcohol polyoxyethylene ether and 7 g of isomeric tridecyl alcohol polyoxyethylene evenly. Add 1.6 g of 30% acetic acid aqueous solution and 285 g of water, and then continue stirring to ensure that the pH value of the emulsion is 4 - 6 to obtain the amino silicone oil softener.

[0065] Example 5

[0066] A preparation method of an amino silicone oil softener specifically includes the following steps:

[0067] (1) Add 312 g of α,ω-hydroxy polydimethylsiloxane and 28 g of 3-aminopropyltrimethoxysilane into a three-necked flask equipped with a stirrer and a reflux device. Heat up to 90 °C, add 0.46 g of ammonium hydroxide and react for 6 h to obtain active silicone oil;

[0068] (2) Cool down to 75 °C, and carry out a stirring reflux reaction for 5 h with 232 g of the active silicone oil obtained in step (1) and 36 g of allyl polyoxyethyl polyoxypropyl epoxy ether in 92 mL of isopropanol. After the reaction, a colorless and transparent block polyether amino silicone oil is obtained;

[0069] (3) Mix 100 g of the block polyether amino silicone oil obtained in step (2), 6 g of decyl alcohol polyoxyethylene ether and 10 g of isomeric tridecyl alcohol polyoxyethylene evenly. Add 1.2 g of 40% acetic acid aqueous solution and 277 g of water, and then continue stirring to ensure that the pH value of the emulsion is 4 - 6 to obtain the amino silicone oil softener.

[0070] Example 6

[0071] A preparation method of an amino silicone oil softener specifically includes the following steps:

[0072] (1) Add 317 g of α,ω-hydroxy polydimethylsiloxane and 33.9 g of N-2-aminoethyl-3-aminopropyltrimethoxysilane into a three-necked flask equipped with a stirrer and a reflux device. Heat up to 90 °C, add 0.5 g of ammonium hydroxide and react for 8 h to obtain active silicone oil;

[0073] (2) Cool down to 80 °C, and carry out a stirring reflux reaction for 8 h with 238 g of the active silicone oil obtained in step (1) and 29.9 g of allyl polyoxyethyl polyoxypropyl epoxy ether in 102 mL of isopropanol. After the reaction is completed, a colorless and transparent block polyether amino silicone oil is obtained;

[0074] (3) Mix 95 g of the block polyether amino silicone oil obtained in step (2), 6.5 g of decyl alcohol polyoxyethylene ether, and 8.9 g of isomeric tridecyl alcohol polyoxyethylene evenly. Add 0.89 g of a 50% acetic acid aqueous solution and 235 g of water, and then continue stirring to ensure that the pH value of the emulsion is 4 - 6, obtaining the amino silicone oil softener.

[0075] Example 7

[0076] A preparation method of an amino silicone oil softener, which is different from Example 1 in that isomeric tridecyl alcohol polyoxyethylene is not added, and the dosage of decyl alcohol polyoxyethylene ether is 15 g. Other substances, dosages, and steps are the same as those in Example 1.

[0077] Example 8

[0078] A preparation method of an amino silicone oil softener, which is different from Example 1 in that decyl alcohol polyoxyethylene ether is not added, and the dosage of isomeric tridecyl alcohol polyoxyethylene is 15 g. Other substances, dosages, and steps are the same as those in Example 1.

[0079] Example 9

[0080] A preparation method of an amino silicone oil softener, which is different from Example 1 in that fatty alcohol polyoxyethylene ether of equal mass is used to replace decyl alcohol polyoxyethylene ether. Other substances, dosages, and steps are the same as those in Example 1.

[0081] Example 10

[0082] A preparation method of an amino silicone oil softener, which is different from Example 1 in that isomeric decyl alcohol polyoxyethylene ether of equal mass is used to replace decyl alcohol polyoxyethylene ether. Other substances, dosages, and steps are the same as those in Example 1.

[0083] Comparative Example 1

[0084] A preparation method of an amino silicone oil softener, which is different from Example 1 in that 2,3-epoxypropyl trimethyl ammonium chloride is used to replace allyl polyoxyethyl polyoxypropyl epoxy ether. Other substances, dosages, and steps are the same as those in Example 1.

[0085] Performance test:

[0086] (1) Stability test: The dilution concentration of the amino silicone softener was 5%. Saturated sodium chloride and saturated sodium bicarbonate were added respectively to observe whether precipitation occurred. If the solution remained clear and transparent, the result was "good"; if flocculates or precipitation appeared in the solution, the result was "general".

[0087] (2) The amino silicone softeners prepared by the above examples and comparative examples were used for soft finishing of fabrics. The experimental method for testing the performance of the softener was as follows: White ultra-fine fiber base fabric was used. The dilution concentration of the amino silicone softener was 5%. The seven-dip and seven-roll method was adopted and dried at 120 °C for 2 h to obtain the fabric sample after soft treatment. Performance tests were carried out on the treated fabric samples respectively, and the methods were as follows:

[0088] ① Softness test: The touch method was adopted, and the evaluation criteria were fullness, softness and smoothness as indicators, divided into 1 - 5 levels, and level 5 was the softest.

[0089] ② Hydrophilicity test: A dropper was used to drop 1 drop of water from a height of 2 cm above the fabric sample onto the surface of the flat fabric, and the time taken for the fabric to absorb the water droplet was measured.

[0090] ③ Whiteness test: A computer colorimeter was used to measure and evaluate the whiteness value of the ultra-fine fiber base fabric after soft treatment.

[0091] The amino silicone softeners provided in Examples 1 - 10 and Comparative Example 1 were tested according to the above tests, and the test results are shown in Table 1:

[0092] Table 1

[0093] Hand feeling / level Whiteness Water absorption time / s Stability Example 1 4.5 82.9 1.5 Good Example 2 4.5 82.5 1.25 Good Example 3 4.5 83.2 0.98 Good Example 4 4.5 82.7 1.85 Good Example 5 4.5 82.2 1.72 Good Example 6 4.5 83.0 0.94 Good Example 7 4 80.4 5.49 Good Example 8 3 81.2 5.52 Good Example 9 3 80.1 7.14 Average Example 10 3 79.6 6.55 Average Comparative example 1 2 77.2 9.75 Average

[0094] It can be seen from the data in Table 1 that:

[0095] The amino silicone softeners provided in Examples 1 - 10 had excellent softness, stability and hydrophilicity; while the amino silicone softener provided in Comparative Example 1 had relatively poor softness, stability and hydrophilicity.

[0096] Further comparing the data of Example 1 and Examples 7 - 8, it can be seen that using isomeric tridecanol polyoxyethylene and decanol polyoxyethylene ether in combination as emulsifiers had a better effect on the amino silicone softener than adding them alone.

[0097] Finally, comparing the data of Example 1 and Examples 9 - 10, it can also be seen that replacing decanol polyoxyethylene ether with fatty alcohol polyoxyethylene ether or isomeric decanol polyoxyethylene ether decreased the emulsification effect of the amino silicone softener, resulting in the overall stability of the amino silicone softener and the performance of the white ultra-fine fiber base fabric treated by it being inferior to that of Example 1.

[0098] The applicant declares that the present invention illustrates an amino silicone softener, its preparation method and application through the above embodiments, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A method for preparing an amino silicone oil softener, characterized in that: The preparation method comprises the following steps: (1) mixing α,ω-hydroxy polydimethylsiloxane and an aminosilane coupling agent, adding a catalyst to react, and obtaining an active silicone oil; (2) reacting the active silicone oil obtained in step (1) with the epoxy-terminated polyether silicone oil in an organic solvent to obtain a segmented polyether amino silicone oil; (3) The block polyether amino silicone oil obtained in step (2) is mixed with an emulsifier, and a pH adjuster and water are added and mixed to obtain the amino silicone oil softener.

2. The preparation method according to claim 1, characterized in that: The mass ratio of the α,ω-hydroxy polydimethylsiloxane, the aminosilane coupling agent and the catalyst in step (1) is (300-350):(20-35):(0.25-0.5); Preferably, the aminosilane coupling agent in step (1) includes any one of 3-diethylenetriaminopropyltrimethoxysilane, N-2-aminoethyl-3-aminopropyltrimethoxysilane, N,N-dimethyl-3-aminopropyltrimethoxysilane or 3-aminopropyltrimethoxysilane, or a combination of at least two thereof; Preferably, the catalyst in step (1) is a basic catalyst; Preferably, the alkaline catalyst includes any one of potassium hydroxide, ammonium hydroxide or tetramethylammonium hydroxide, or a combination of at least two thereof.

3. The preparation method according to claim 1 or 2, characterized in that: The reaction temperature in step (1) is 70-120°C; Preferably, the reaction time in step (1) is 4 to 7 hours.

4. The preparation method according to any one of claims 1 to 3, characterized in that: The mass ratio of the active silicone oil to the epoxy-terminated polyether silicone oil in step (2) is (220-250):(30-43); Preferably, the epoxy-terminated polyether silicone oil in step (2) comprises allyl polyoxyethyl polyoxypropyl epoxy ether; Preferably, the organic solvent in step (2) comprises isopropanol.

5. The preparation method according to any one of claims 1 to 4, characterized in that: The reaction temperature in step (2) is 60-80°C; Preferably, the reaction time in step (2) is 6 to 8 hours.

6. The preparation method according to any one of claims 1 to 5, characterized in that: The mass ratio of the block polyether amino silicone oil, emulsifier, pH adjuster and water in step (3) is (10-35):(4-10):(0.1-1):(50-75); Preferably, the emulsifier in step (3) comprises decyl alcohol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether; Preferably, the mass ratio of the decyl alcohol polyoxyethylene ether to the isomeric tridecanol polyoxyethylene ether is (2-10):(2-15); Preferably, the pH adjuster in step (3) comprises glacial acetic acid.

7. An amino silicone softener, characterized in that: The amino silicone oil softener is prepared by the preparation method according to any one of claims 1 to 6.

8. The amino silicone softener according to claim 7, characterized in that: The particle size of the amino silicone softener emulsion is 30 to 50 nm; Preferably, the pH value of the amino silicone softener is 4-6.

9. Use of the amino silicone oil softener according to claim 7 or 8 in softening treatment of textiles.

10. A fabric, characterized in that: The fabric is obtained by softening with the amino silicone oil softener as claimed in claim 7 or 8.