Defoaming composition for textile industry as well as preparation method and application of defoaming composition

Abstract

The invention relates to the technical field of defoaming and textile after-finishing, in particular to a defoaming composition for the textile industry and a preparation method and application of the defoaming composition. 3%-15% of hydroxyl silicone resin; 3%-25% of amino silicon oil; 1%-12% of hydrophobic white carbon black; 3%-25% of amino-terminated silicon polyether; and 0.01%-0.5% of a base catalyst. The defoaming composition can be further prepared into an emulsion type defoaming agent and a powder defoaming agent through the known technology. The defoaming composition for the textile industry as well as the preparation method and the application of the defoaming composition have the beneficial effects that the amino-terminated silicon polyether and fibers are adopted to form weak chemical / electrostatic interaction, so that the consistency of soft hand feeling is improved; a silicone oil-silicon resin framework and a hydrophobic SiOthixotropic network are matched, so that the rapid foam breaking and foam inhibition durability is remarkably improved.

Description

Technical Field

[0001] This invention relates to the fields of defoaming and textile finishing technology, and discloses a defoaming composition for the textile industry, its preparation method, and its application. Background Technology

[0002] The rapid development of the textile industry has placed higher demands on the functionality and durability of fibers. While common fibers possess a certain degree of strength and softness, they still face significant wear and tear during actual use, greatly impacting the lifespan of fiber fabrics.

[0003] In textile printing, dyeing, and finishing processes, a large amount of surfactants can cause foaming, affecting fabric stability and quality. Therefore, defoamers need to be added during the process to remove foam. Commonly used defoamers in the textile industry are polyether-based and silicone-based. Polyether-based defoamers are highly temperature-dependent, only effective within their cloud point range, resulting in relatively poor foam suppression and defoaming performance. Silicone-based defoamers are currently recognized as highly efficient, effectively suppressing and eliminating foam. However, they exhibit poor dispersibility and stability in aqueous solutions, easily leading to demulsification and oil separation. Furthermore, existing silicone-based defoamers suffer from slow foam collapse and poor high-temperature resistance, particularly during high-temperature dyeing (around 130°C), where they are prone to precipitation and the formation of silica spots. Patents CN102284198 and CN102527096A propose polyether-modified polysiloxanes, which possess certain emulsifying properties by grafting hydrophilic polyether segments onto the polysiloxane backbone via Si-C or Si-OC bonds. Patent EP0341952 further enhances the defoaming and foam-suppressing properties of emulsions by combining polyorganosiloxanes and polyether-modified polysiloxanes. While polyether-modified polysiloxanes can improve the stability of organosilicon defoamers in textile printing and dyeing systems, they still cannot solve the problem of easy chain breakage of siloxanes in strong acid and alkali systems, resulting in poor applicability in strong alkaline systems. Patent CN103074784 provides a method using starch as a stabilizer to improve the acid and alkali resistance of emulsions; however, the large amount of stabilizer required degrades the defoaming and foam-suppressing properties. Chinese patent publication number CN103603215B discloses a method for preparing an organosilicon defoamer for textile printing and dyeing. The method involves adding a catalyst and reacting an organosilicon composition with a polyether-modified polysiloxane under high temperature and high shear conditions to obtain the organosilicon defoamer. This defoamer exhibits excellent stability in strong acid and alkali systems while maintaining superior defoaming and foam-suppressing performance. However, it does not further address issues such as silicone spots that can form in organosilicon defoamers. Furthermore, the method utilizes polyether-modified polysiloxane with an HLB value of 2-9 to react with the organosilicon composition. The existing methods cannot effectively shield the silicone composite particles spatially, preventing the siloxane particles from breaking their chain in strong acid and alkali systems. To address the silicone spot problem, Chinese Patent Publication No. CN105749588B discloses a silicone-free defoamer for textiles and its preparation method. This defoamer uses a combination of soybean oil residue and polyester, and does not contain silicone compounds. It has strong defoaming and foam-suppressing abilities, good stability in strong acid and alkali environments, and uses inexpensive and readily available raw materials, making it a waste-utilizing and environmentally friendly product. However, its defoaming performance still cannot compare with that of silicone-based defoamers. Summary of the Invention

[0004] To address the aforementioned issues, the dispersibility of polyether segments can be improved by introducing polyether segments. However, ordinary hydroxyl or alkoxy-terminated silicone polyethers tend to migrate and aggregate under high-temperature alkaline conditions, leading to performance degradation. Therefore, this invention introduces amino-terminated silicone polyethers, which combine the characteristics of rapid defoaming, long-lasting foam suppression, and good water dispersibility.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A defoaming composition for the textile industry, its preparation method, and its application, characterized in that the defoaming composition for the textile industry comprises the following components by mass percentage (calculated based on the finished defoaming composition):

[0007] Hydroxy silicone oil 25%-60%, viscosity at 25℃ is 1000-10000 mPa·s; hydroxy silicone resin 3%-15%, -Si-OH content is 0.3%-3%; amino silicone oil 3%-25%; hydrophobic silica 1%-12%; amino-terminated silicone polyether 3%-25%; alkali catalyst 0.01%-0.5%.

[0008] Furthermore, the amino silicone oil is selected from amino silicone oils with low ammonia value and medium to high molecular weight, wherein the ammonia value is 0.01-1 mmol / g and the molecular weight is 500-10000. The amino silicone oil with low ammonia value and medium to high molecular weight can improve the stability and water dispersibility of the composition.

[0009] Furthermore, the hydrophobic silica is selected from materials with a specific surface area of ​​150-300 m². 2 / g of hydrophobic fumed silica or hydrophobic precipitated silica;

[0010] Furthermore, the amino-terminated silicone polyether is prepared by an epoxy-terminated polyether and an amino-terminated silicone oil via an epoxy-amine ring-opening method. Specifically, the amino-terminated silicone oil is placed in a reaction vessel and stirred and dehydrated for 1–2 hours at 80-100°C and a vacuum degree ≤10 mmHg. After dehydration, nitrogen gas is introduced to release the vacuum, and the material is cooled to about 50°C. The epoxy-terminated polyether is then added, stirring is started, and the temperature is slowly raised to 90-100°C and held for 4-8 hours. After the reaction is completed, the temperature is lowered to room temperature to obtain the amino-terminated silicone polyether required by this invention.

[0011] Furthermore, in the method for preparing the amino-terminated silicone polyether, the epoxy equivalent to amine equivalent of the epoxy-terminated polyether and the amino-terminated silicone oil is 1.00:(0.95-1.05).

[0012] Furthermore, the alkaline catalyst described in this invention is selected from any one of sodium hydroxide, potassium hydroxide, potassium silyl alkoxide, sodium silyl alkoxide, sodium methoxide, potassium methoxide, potassium ethoxide, and tetramethylammonium hydroxide.

[0013] The present invention discloses a method for preparing an antifoaming composition for the textile industry, comprising the following steps:

[0014] S1, under alkaline catalysis at 40-80℃, hydroxyl silicone oil and hydroxyl silicone resin are condensed, and the viscosity of the system is controlled at 3000-100000mPa·s under high-speed shear conditions.

[0015] S2, raise the temperature to 70-120℃, add amino silicone oil and hydrophobic silica, stir evenly, and keep warm for 3-5 hours;

[0016] S3, after the heat preservation is completed, add amino-terminated silicone polyether at a temperature of 70-120℃ and keep warm for 0.5-2 hours to obtain the defoaming composition.

[0017] The defoaming composition of the present invention can be further formulated into an emulsion. The method is as follows: using a known defoamer preparation method, the defoaming composition is mixed with an emulsifier, water and a thickener are gradually added, and after mixing evenly, the pH is adjusted to 6.5-7.5 to obtain an emulsion-type textile defoamer.

[0018] The defoaming composition of the present invention can be further formulated into a powder defoamer. The method is as follows: using a known defoamer preparation method, the defoaming composition, emulsifier and structural agent are first fully mixed, then adsorbed onto a carrier, and finally water is added. After crushing and drying, a powdered solid defoamer is formed.

[0019] The defoaming composition for the textile industry, its preparation method, and its application described in this invention bring the following beneficial effects: the use of amino-terminated silicone polyether to form a weak chemical / electrostatic interaction with fibers improves the consistency of soft hand feel; and the combination of a "silicone oil-silicone resin" skeleton and a hydrophobic SiO2 thixotropic network significantly enhances rapid foam breaking and long-lasting foam suppression. Detailed Implementation

[0020] Preparation of amino-terminated silicone polyether

[0021]

[0022] Example 1

[0023] S1, under the catalytic conditions of 0.26 parts sodium hydroxide at 50℃, 27.4 parts hydroxyl silicone oil (viscosity of 5000 mPa·s at 25℃) and 15 parts hydroxyl silicone resin (-Si-OH content of 0.8%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 90000 mPa·s.

[0024] S2, raise the temperature to 110℃ and add 20 parts of amino silicone oil (ammonia value 0.3 mmol / g, molecular weight 10000) and 12 parts of hydrophobic fumed silica (specific surface area 150 m²). 2(g), stir well and keep warm for 3 hours;

[0025] S3, after the heat preservation is completed, 25 parts of amino-terminated silicone polyether M1 are added at 110°C and the mixture is kept at 110°C for 2 hours to obtain the defoaming composition P1.

[0026] Example 2

[0027] S1, under the catalysis of 0.3 parts sodium hydroxide at 60℃, 40 parts hydroxyl silicone oil (viscosity of 10000 mPa·s at 25℃) and 10 parts hydroxyl silicone resin (-Si-OH content of 3%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 8000 mPa·s.

[0028] S2, raise the temperature to 120℃ and add 20 parts of amino silicone oil (ammonia value 0.2 mmol / g, molecular weight 5000) and 5 parts of hydrophobic precipitated silica (specific surface area 200 m²). 2 (g), stir well and keep warm for 5 hours;

[0029] S3, after the heat preservation is completed, 24.7 parts of amino-terminated silicone polyether M1 are added at 120℃ and the mixture is kept warm for 1 hour to obtain the defoaming composition P2.

[0030] Example 3

[0031] S1, under the catalysis of 0.5 parts potassium hydroxide at 80℃, 35 parts hydroxyl silicone oil (viscosity of 1000 mPa·s at 25℃) and 15 parts hydroxyl silicone resin (-Si-OH content of 2%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 20000 mPa·s.

[0032] S2, raise the temperature to 120℃ and add 19.5 parts of amino silicone oil (ammonia value 0.3 mmol / g, molecular weight 8000) and 7 parts of hydrophobic fumed silica (specific surface area 200 m²). 2 (g), stir well and keep warm for 4 hours;

[0033] S3, after the heat preservation is completed, 23 parts of amino-terminated silicone polyether M2 are added at 120°C and the mixture is kept at 120°C for 1 hour to obtain the defoaming composition P3.

[0034] Example 4

[0035] S1, under the catalytic conditions of 0.01 parts sodium methoxide at 75℃, 49 parts hydroxyl silicone oil (viscosity of 1200 mPa·s at 25℃) and 11.99 parts hydroxyl silicone resin (-Si-OH content of 0.3%) were condensed, and the viscosity of the system was controlled at 3000 mPa·s under high-speed shear conditions.

[0036] S2, raise the temperature to 110℃ and add 15 parts of amino silicone oil (ammonia value 0.01 mmol / g, molecular weight 6000) and 6 parts of hydrophobic precipitated silica (specific surface area 250 m²). 2 (g), stir well and keep warm for 3 hours;

[0037] S3, after the heat preservation is completed, 18 parts of amino-terminated silicone polyether M2 are added at 110℃ and the heat preservation is carried out for 1.5h to obtain the defoaming composition P4.

[0038] Example 5

[0039] S1, under the catalytic conditions of 0.05 parts potassium hydroxide at 70℃, 43 parts hydroxyl silicone oil (viscosity of 2000 mPa·s at 25℃) and 15 parts hydroxyl silicone resin (-Si-OH content of 1%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 80000 mPa·s.

[0040] S2, raise the temperature to 90℃ and add 15.95 parts of amino silicone oil (ammonia value 0.5 mmol / g, molecular weight 3000) and 12 parts of hydrophobic precipitated silica (specific surface area 300 m²). 2 (g), stir well and keep warm for 3.5 hours;

[0041] S3, after the heat preservation is completed, 14 parts of amino-terminated silicone polyether M3 are added at 90°C and the mixture is kept at 90°C for 2 hours to obtain the defoaming composition P5.

[0042] Example 6

[0043] S1, under the catalysis of 0.1 part tetramethylammonium hydroxide, 45 parts hydroxyl silicone oil (viscosity of 3000 mPa·s at 25℃) and 3.9 parts hydroxyl silicone resin (-Si-OH content of 1.2%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 120000 mPa·s.

[0044] S2, raise the temperature to 70℃ and add 12 parts amino silicone oil (ammonia value 1 mmol / g, molecular weight 2000) and 12 parts hydrophobic fumed silica (specific surface area 220 m²). 2 (g), stir well and keep warm for 4 hours;

[0045] S3, after the heat preservation is completed, 25 parts of amino-terminated silicone polyether M3 are added at 70°C and the mixture is kept at 70°C for 2 hours to obtain the defoaming composition P6.

[0046] Example 7

[0047] S1, under the catalysis of 0.5 parts sodium hydroxide at 55℃, 59.5 parts hydroxyl silicone oil (viscosity of 6000 mPa·s at 25℃) and 3 parts hydroxyl silicone resin (-Si-OH content of 2.2%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 100000 mPa·s.

[0048] S2, raise the temperature to 80℃ and add 14 parts amino silicone oil (ammonia value 0.8 mmol / g, molecular weight 1000) and 1 part hydrophobic precipitated silica (specific surface area 180 m²). 2 (g), stir well and keep warm for 4.5 hours;

[0049] S3, after the heat preservation is completed, 22 parts of amino-terminated silicone polyether M4 are added at 80°C and the mixture is kept at 80°C for 0.5 hours to obtain the defoaming composition P7.

[0050] Example 8

[0051] S1, under the catalysis of 0.02 parts potassium silylate, 33.98 parts hydroxyl silicone oil (viscosity of 8000 mPa·s at 25℃) and 9 parts hydroxyl silicone resin (-Si-OH content of 1.5%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 450000 mPa·s.

[0052] S2, raise the temperature to 100℃ and add 20 parts of amino silicone oil (ammonia value 0.08 mmol / g, molecular weight 800) and 12 parts of hydrophobic fumed silica (specific surface area 280 m²). 2 (g), stir well and keep warm for 5 hours;

[0053] S3, after the heat preservation is completed, 25 parts of amino-terminated silicone polyether M4 are added at 100℃ and the mixture is kept at 1h to obtain the defoaming composition P8.

[0054] Example 9

[0055] S1, under the catalysis of 0.4 parts potassium hydroxide at 40℃, 60 parts hydroxyl silicone oil (viscosity of 2500 mPa·s at 25℃) and 15 parts hydroxyl silicone resin (-Si-OH content of 0.5%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 65000 mPa·s.

[0056] S2, raise the temperature to 120℃ and add 3 parts amino silicone oil (ammonia value 0.6 mmol / g, molecular weight 2500) and 1 part hydrophobic fumed silica (specific surface area 200 m²). 2 (g), stir well and keep warm for 4 hours;

[0057] S3, after the heat preservation is completed, 20.6 parts of amino-terminated silicone polyether M5 are added at 120℃ and the mixture is kept warm for 2 hours to obtain the defoaming composition P9.

[0058] Example 10

[0059] S1, under the catalysis of 0.3 parts sodium hydroxide at 80℃, 49.7 parts hydroxyl silicone oil (viscosity of 3000 mPa·s at 25℃) and 15 parts hydroxyl silicone resin (-Si-OH content of 1.65%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 50000 mPa·s.

[0060] S2, raise the temperature to 110℃ and add 20 parts of amino silicone oil (ammonia value 0.2 mmol / g, molecular weight 500) and 12 parts of hydrophobic fumed silica (specific surface area 230 m²). 2 (g), stir well and keep warm for 3 hours;

[0061] S3, after the heat preservation is completed, add 3 parts of amino-terminated silicone polyether M5 at 110℃ and keep warm for 1.5h to obtain the defoaming composition P10.

[0062] Comparative Example 1

[0063] S1, under the catalytic conditions of 0.26 parts sodium hydroxide at 50℃, 27.4 parts hydroxyl silicone oil (viscosity of 5000 mPa·s at 25℃) and 15 parts hydroxyl silicone resin (-Si-OH content of 0.8%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 90000 mPa·s.

[0064] S2, raise the temperature to 110℃ and add 20 parts of amino silicone oil (ammonia value 1.5 mmol / g, molecular weight 10000) and 12 parts of hydrophobic fumed silica (specific surface area 150 m²). 2 (g), stir well and keep warm for 3 hours;

[0065] S3, after the heat preservation is completed, 25 parts of amino-terminated silicone polyether M1 are added at 110℃ and the mixture is kept warm for 2 hours to obtain the defoaming composition P11.

[0066] Comparative Example 2

[0067] S1, under the catalysis of 0.3 parts sodium hydroxide at 60℃, 40 parts hydroxyl silicone oil (viscosity of 10000 mPa·s at 25℃) and 10 parts hydroxyl silicone resin (-Si-OH content of 3%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 8000 mPa·s.

[0068] S2, raise the temperature to 120℃ and add 20 parts of amino silicone oil (ammonia value 0.2 mmol / g, molecular weight 200) and 5 parts of hydrophobic precipitated silica (specific surface area 200 m²). 2 (g), stir well and keep warm for 5 hours;

[0069] S3, after the heat preservation is completed, 24.7 parts of amino-terminated silicone polyether M1 are added at 120℃ and the mixture is kept warm for 1 hour to obtain the defoaming composition P12.

[0070] Comparative Example 3

[0071] S1, under the catalysis of 0.5 parts potassium hydroxide at 80℃, 35 parts hydroxyl silicone oil (viscosity of 1000 mPa·s at 25℃) and 15 parts hydroxyl silicone resin (-Si-OH content of 2%) were condensed. Under high-speed shear conditions, the viscosity of the system was controlled at 20000 mPa·s.

[0072] S2, raise the temperature to 120℃ and add 19.5 parts of amino silicone oil (ammonia value 1.5 mmol / g, molecular weight 200) and 7 parts of hydrophobic fumed silica (specific surface area 200 m²). 2 (g), stir well and keep warm for 4 hours;

[0073] S3, after the heat preservation is completed, 23 parts of amino-terminated silicone polyether M2 are added at 120°C and the mixture is kept at 120°C for 1 hour to obtain the defoaming composition P13.

[0074] Comparative Example 4

[0075] S1, under the catalytic conditions of 0.01 parts sodium methoxide at 75℃, 49 parts hydroxyl silicone oil (viscosity of 1200 mPa·s at 25℃) and 11.99 parts hydroxyl silicone resin (-Si-OH content of 0.3%) were condensed, and the viscosity of the system was controlled at 3000 mPa·s under high-speed shear conditions.

[0076] S2, raise the temperature to 110℃ and add 15 parts amino silicone oil (ammonia value 1 mmol / g, molecular weight 6000) and 6 parts hydrophobic precipitated silica (specific surface area 250 m²). 2 (g), stir well and keep warm for 3 hours;

[0077] S3, after the heat preservation is completed, 18 parts of hydroxyl-terminated silicone polyether are added at 110℃ and the heat preservation is carried out for 1.5h to obtain the defoaming composition P14.

[0078] Defoaming and foam-inhibiting performance test

[0079] Prepare an emulsion from the defoaming composition: According to known techniques, mix the defoaming composition with an emulsifier, gradually add water and a thickener, mix evenly, and adjust the pH value to obtain an emulsion-type textile defoamer.

[0080] (I) Defoaming and foam-suppressing performance test method: Take 50 mL of the specified standard foaming medium (5‰ ABS aqueous solution) in a graduated cylinder with a stopper. Under constant temperature of 60℃, add 0.03 g of defoamer sample, stopper the bottle, and shake the graduated cylinder up and down several times at a frequency of 2 times / second and an amplitude of 30~35 cm. Let it stand and start timing. Record the time taken for the foam to disappear until the liquid surface appears. This is the defoaming and foam-suppressing time of this shake flask test. The test results are as follows:

[0081]

[0082] Water dispersibility test:

[0083] Test method:

[0084] 1) Preparation of sodium hydroxide aqueous solution: Weigh 0.6g of sodium hydroxide into a 500mL beaker, and slowly pour 499.4g of water into the beaker in three portions. During the addition process, stir continuously with a glass rod at a speed of 2 seconds per turn clockwise. After all the water has been added, continue stirring for 30 seconds to ensure that the sodium hydroxide is fully and evenly dissolved.

[0085] 2) Dilute the prepared defoamer emulsion to a concentration of 5%.

[0086] 3) Boiling Test: Weigh 8.0g of defoamer into a 250ml beaker. Slowly add 192.0g of sodium hydroxide aqueous solution to the beaker in three portions, stirring continuously with a glass rod at a clockwise speed of 2 seconds per addition. After all the solution is added, continue stirring for 30 seconds. Place the beaker on an electric stove and heat it. Record the appearance of the solution at 60℃ and 80℃. After the solution boils, maintain the boiling point for 10 seconds, then turn off the stove, remove the beaker, and let it stand for 1 hour. Record the appearance of the solution again at room temperature. The test results are as follows:

[0087]

Claims

1. A defoaming composition for the textile industry, characterized in that, According to the mass percentage, it is composed of the following components: The hydroxyl silicone oil 25%-60%, the viscosity at 25°C is 1000-10000 mPa·s; the hydroxyl silicone resin 3%-15%, the-Si-OH content is 0.3%-3%; the amino silicone oil 3%-25%; the hydrophobic white carbon black 1%-12%; the amino-terminated silicone polyether 3%-25%; the alkali catalyst 0.01%-0.5%, the sum of the mass percentage of the above components is 100%; The amino silicone oil is selected from low amino value, medium-high molecular weight amino silicone oil, and specifically selected from the amino silicone oil with the amino value of 0.01-1 mmol / g and the molecular weight of 500-10000. The preparation method of the defoaming composition for the textile industry is as follows: S1, under the conditions of 40-80°C and alkali catalysis, the hydroxyl silicone oil is condensed with the hydroxyl silicone resin, and the viscosity of the system is controlled to be 3000-100000 mPa·s under the condition of high-speed shearing; S2, the temperature is increased to 70-120°C, the amino silicone oil and the hydrophobic white carbon black are added, and stirring is uniform, and the temperature is kept for 3-5h; S3, after the temperature keeping is completed, the amino-terminated silicone polyether is added at the temperature of 70-120°C, and the temperature is kept for 0.5-2h, to obtain the defoaming composition.

2. A defoaming composition for textile industry as claimed in claim 1, wherein, The viscosity of the hydroxyl silicone oil at 25°C is 1000-10000 mPa·s.

3. A defoaming composition for textile industry as claimed in claim 1, wherein, The-Si-OH content in the hydroxyl silicone resin is 0.3%-3%.

4. A defoaming composition for textile industry as claimed in claim 1, wherein, The hydrophobic white carbon black is selected from the hydrophobic fumed white carbon black or the hydrophobic precipitated white carbon black with the specific surface area of 150-300 m2 / g.

5. A defoaming composition for textile industry as claimed in claim 1, wherein, The amino-terminated silicone polyether is prepared by the epoxy-amine ring-opening method of the epoxy-terminated polyether and the amino-terminated silicone oil, and the specific preparation method is that the amino-terminated silicone oil is placed in a reaction kettle, stirring is carried out under the conditions of 80-100°C and vacuum degree ≤10 mmHg for 1-2 hours, after the dehydration is completed, nitrogen is introduced to remove the vacuum, and the material is cooled to about 50°C, the epoxy-terminated polyether is added, stirring is started, the temperature is slowly increased to 90-100°C, and the temperature is kept for 4-8h; after the reaction is completed, the temperature is decreased to room temperature, and the required amino-terminated silicone polyether is obtained.

6. A defoaming composition for textile industry as claimed in claim 5, wherein, The epoxy equivalent weight of the epoxy-terminated polyether and the amino-terminated silicone oil: the amine equivalent weight = 1.00: (0.95-1.05).

7. A defoaming composition for textile industry as claimed in claim 1, wherein, The alkali catalyst is selected from any one of sodium hydroxide, potassium hydroxide, potassium silanolate, sodium silanolate, sodium methoxide, potassium methoxide, potassium ethoxide, and tetramethylammonium hydroxide.

8. Use of a defoamer composition according to any one of claims 1 to 7 in the textile industry, characterized in that, The defoaming composition can be prepared into an emulsion type defoaming agent and a powder defoaming agent by using the known technology.

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