High-temperature-resistant defoaming agent for polyester dyeing, preparation method and application thereof

Abstract

This application relates to the field of defoamer technology, and discloses a high-temperature resistant defoamer for polyester dyeing, its preparation method, and its application. A high-temperature resistant defoamer for polyester dyeing comprises the following raw materials in parts by weight: 12-25 parts rice bran wax, 8-15 parts nonionic surfactant, 6-18 parts polysiloxane-organosilicone rubber block copolymer, and 35-60 parts deionized water; wherein the polysiloxane-organosilicone rubber block copolymer comprises polysiloxane, organosilicone rubber, initiator, emulsifier, and solvent in a weight ratio of 0.1-0.3:0.2-0.5:0.01-0.05:0.01-0.03:0.3-0.6. The high-temperature resistant defoamer for polyester dyeing prepared using specific component raw materials in this application maintains good defoaming performance and stability in high-temperature environments, while also assisting dye penetration, thus improving the efficiency and effect of polyester dyeing.

Description

Technical Field

[0001] This application relates to the field of defoamer technology, and in particular to a high-temperature resistant defoamer for polyester dyeing, its preparation method and its application. Background Technology

[0002] Foam formation is a common problem in textile processing. For example, foam may be generated during sizing and high-speed yarn movement. If this foam is not dealt with in time, it can lead to defects such as white spots and uneven fabric patterns and colors. In pretreatment, the use of desizing agents during desizing and scouring agents and detergents during bleaching and washing, along with the high-temperature scouring used to better and more evenly penetrate the fabric, can also cause foam formation. During medium-temperature and high-temperature dyeing, the vibration of mechanical operations can also lead to foam formation, thus affecting the quality of the finished product. Improper mixing during the paste preparation process and during the printing process can also cause foam formation.

[0003] The generation of these bubbles not only affects the dyeing effect, but also leads to uneven processing. In order to suppress the generation of bubbles, defoamers are usually added, which can effectively eliminate bubbles in the textile processing process, improve production efficiency and product quality, and have antifoaming properties. They can suppress the generation of bubbles in a short time and prevent the secondary occurrence of bubbles.

[0004] However, under the high temperature environment generated by prolonged mechanical vibration, the activity of the defoamer will decrease, and its ability to suppress foam will also decrease, resulting in poor dyeing effect.

[0005] Therefore, there is an urgent need to provide a defoamer with excellent defoaming performance in high-temperature environments. Summary of the Invention

[0006] In order to solve at least one of the above-mentioned technical problems and develop a defoamer with excellent defoaming performance in high-temperature environments, this application provides a high-temperature resistant defoamer for polyester dyeing, a preparation method and its application.

[0007] On the one hand, this application provides a high-temperature resistant defoamer for polyester dyeing, comprising the following raw materials in parts by weight: 12-25 parts rice bran wax, 8-15 parts nonionic surfactant, 6-18 parts polysiloxane-organosilicone rubber block copolymer, and 35-60 parts deionized water.

[0008] The raw materials of the polysiloxane-organosilicone rubber block copolymer include polysiloxane, organosilicone rubber, initiator, emulsifier and solvent in a weight ratio of 0.1-0.3:0.2-0.5:0.01-0.05:0.01-0.03:0.3-0.6.

[0009] By adopting the above technical solution, the high-temperature resistant defoamer for polyester dyeing prepared by this application using specific component raw materials has excellent comprehensive performance. It maintains good foam suppression performance and stability in high-temperature environment, and will not cause defects such as uneven dyeing or dye spots. At the same time, it can assist the penetration of dyes and improve the processing efficiency and effect of polyester dyeing.

[0010] The rice bran wax used in this application has good defoaming properties and stability, which can effectively inhibit the generation of foam and stabilize the breakage of foam, as well as penetrate into the fiber surface to inhibit the retention of water molecules on the fiber surface and air in the slurry.

[0011] The nonionic surfactant used in this application further enhances the defoaming performance of the defoamer;

[0012] This application utilizes a specific polysiloxane-organosilicone rubber block copolymer with excellent high-temperature resistance, maintaining stable physical and chemical properties in high-temperature environments. This effectively suppresses foam generation and stabilizes foam breakage during high-temperature dyeing. It also exhibits good antifoaming properties, effectively inhibiting foam generation. Furthermore, it can penetrate the fiber surface, enhancing the wettability and adhesion of the defoamer to the fiber surface, thereby better suppressing the retention of water molecules on the fiber surface and air in the slurry.

[0013] Optionally, the weight ratio of the rice bran wax to the nonionic surfactant is 1.2-2:1.

[0014] By adopting the above technical solution, this application selects a better ratio of rice bran wax and nonionic surfactant, which can further optimize the defoaming performance and stability of the high-temperature defoamer; at the same time, it can also improve the penetration and wetting performance of the defoamer, so that the defoamer can better penetrate into the fiber surface and inhibit the retention of water molecules on the fiber surface and air in the slurry.

[0015] Optionally, the rice bran wax is a spherical porous rice bran wax, and the specific surface area of ​​the spherical porous rice bran wax is 300-560 m². 2 / g, with an average particle size of no more than 500nm.

[0016] By adopting the above technical solution, the spherical porous rice bran wax used in this application has a high specific surface area and a small average particle size, which can further enhance the defoaming performance and stability of the defoamer; and the spherical porous rice bran wax has a large specific surface area, which can provide more active centers and adsorption sites, thereby enhancing the ability to adsorb and destroy foam; at the same time, the small average particle size can better penetrate into the fiber surface and slurry, improving the foam suppression effect.

[0017] Optionally, the nonionic surfactant is selected from one or more of alkyl glycosides or fatty alcohol polyoxyethylene ethers.

[0018] Optionally, the nonionic surfactant is selected from the alkyl glycoside and the fatty alcohol polyoxyethylene ether, wherein the weight ratio of the alkyl glycoside and the fatty alcohol polyoxyethylene ether is 0.3-0.5:1.

[0019] By adopting the above technical solution, this application selects specific alkyl glycosides and fatty alcohol polyoxyethylene ethers to effectively reduce the surface tension of water, thereby enhancing the ability to destroy foam, and has excellent compatibility. The high-temperature resistant defoamer prepared for polyester dyeing has good stability. This application selects specific ratios of alkyl glycosides and fatty alcohol polyoxyethylene ethers to further optimize the defoaming performance and stability of the high-temperature resistant defoamer, as well as improve the penetration and wetting performance of the defoamer, so that the defoamer can better penetrate into the fiber surface and inhibit the retention of water molecules on the fiber surface and air in the sizing.

[0020] Optionally, it also includes a porous three-dimensional titanium dioxide cellulose material, the weight of which is 20-48% of the weight of the polysiloxane-organosilicone rubber block copolymer.

[0021] By adopting the above technical solution, the raw materials of the high-temperature resistant defoamer of this application also include titanium dioxide cellulose porous three-dimensional material, which has a high specific surface area and porous structure, can provide more adsorption sites and enhance the adsorption capacity for foam, and can maintain stable physical and chemical properties in high-temperature environments, thereby inhibiting the generation of foam and stabilizing the breakage of foam during the dyeing process.

[0022] Optionally, the initiator is benzoyl peroxide, the emulsifier is sodium dodecyl sulfate, and the solvent is ethanol.

[0023] Secondly, this application provides a method for preparing a high-temperature resistant defoamer for polyester dyeing, comprising the following steps:

[0024] S1. Add rice bran wax and nonionic surfactant to deionized water, heat to 60-80℃ and mix and stir to obtain a mixed solution;

[0025] S2. Keeping the temperature constant, add the polysiloxane-organosilicone rubber block copolymer to the mixed solution and continue mixing and stirring for 1-2 hours to obtain the high-temperature resistant defoamer for polyester dyeing.

[0026] By adopting the above technical solution, the preparation method of the high-temperature resistant defoamer for polyester dyeing in this application is simple and easy to operate, and can be industrialized. The prepared high-temperature resistant defoamer for polyester dyeing has excellent comprehensive performance. It not only has excellent foam suppression performance, but also benefits the penetration of dyes, thereby improving the processing efficiency and effect of polyester dyeing.

[0027] Optionally, in step S2, the preparation method of the polysiloxane-organosilicone rubber block copolymer includes the following steps:

[0028] Step 1: Dissolve the polysiloxane and silicone rubber in a solvent to form a homogeneous solution;

[0029] Step 2: Add an initiator to the homogeneous solution, heat to 65-90℃, mix and stir for 2-5 hours, cool to room temperature, filter, wash and dry to obtain the polysiloxane-organosilicone rubber block copolymer.

[0030] By adopting the above technical solution, the polysiloxane-organosilicone rubber block copolymer prepared in this application has excellent high temperature resistance and permeability.

[0031] Thirdly, this application provides a high-temperature resistant defoamer for polyester dyeing, applicable to the dyeing of polyester, nylon, and cotton fabrics.

[0032] In summary, the present invention has at least one of the following beneficial technical effects:

[0033] 1. The high-temperature resistant defoamer for polyester dyeing prepared using specific component raw materials in this application has excellent comprehensive performance. It maintains good defoaming performance and stability in high-temperature environments, and will not cause defects such as uneven dyeing or dye spots. At the same time, it can assist the penetration of dyes and improve the processing efficiency and effect of polyester dyeing.

[0034] 2. The rice bran wax used in this application has good defoaming properties and stability, which can effectively inhibit foam generation and stabilize foam breakage, and can penetrate into the fiber surface to inhibit the retention of water molecules on the fiber surface and air in the sizing. 3. The specific polysiloxane-organosilicone rubber block copolymer used in this application has excellent high-temperature resistance, and can maintain stable physical and chemical properties in high-temperature environments, thereby effectively inhibiting foam generation and stabilizing foam breakage during high-temperature dyeing; it has good antifoaming properties, which can effectively inhibit foam generation; it can penetrate into the fiber surface, enhancing the wettability and adhesion of the defoamer on the fiber surface, thereby better inhibiting the retention of water molecules on the fiber surface and air in the sizing.

[0035] 4. The preparation method of the high-temperature resistant defoamer for polyester dyeing in this application is simple and easy to operate, and can be industrialized. Detailed Implementation

[0036] The present application will be further described in detail below with reference to the embodiments.

[0037] This application designs a high-temperature resistant defoamer for polyester dyeing, comprising the following raw materials in parts by weight: 12-25 parts rice bran wax, 8-15 parts nonionic surfactant, 6-18 parts polysiloxane-organosilicone rubber block copolymer, and 35-60 parts deionized water.

[0038] The raw materials of the polysiloxane-organosilicone rubber block copolymer include polysiloxane, organosilicone rubber, initiator, emulsifier and solvent in a weight ratio of 0.1-0.3:0.2-0.5:0.01-0.05:0.01-0.03:0.3-0.6.

[0039] The present application discloses a method for preparing a high-temperature resistant defoamer for polyester dyeing, comprising the following steps:

[0040] S1. Add rice bran wax and nonionic surfactant to deionized water, heat to 60-80℃ and mix and stir to obtain a mixed solution;

[0041] S2. Keeping the temperature constant, add the polysiloxane-organosilicone rubber block copolymer to the mixed solution and continue mixing and stirring for 1-2 hours to obtain the high-temperature resistant defoamer for polyester dyeing.

[0042] The present application of a high-temperature resistant defoamer for polyester dyeing in the fields of polyester, nylon and cotton dyeing. Specific Implementation

[0044] The raw materials used in this application are as follows. Unless otherwise specified, all raw materials used in this application are commercially available:

[0045] Rice bran wax: Brand: Shiteng; Purity: 99%;

[0046] Deionized water: CAS No. 7732-18-5;

[0047] Polysiloxane: CAS No. 63148-62-9;

[0048] Silicone rubber: Brand: Dow Chemical; Model: 9702140;

[0049] Titanium dioxide cellulose porous three-dimensional material: Brand: Qiyue Biotechnology, Purity: 99%;

[0050] Alkyl glycosides: 99% purity;

[0051] Fatty alcohol polyoxyethylene ether: CAS No. 68131-39-5;

[0052] Benzoyl peroxide: CAS No. 94-36-0;

[0053] Sodium dodecyl sulfate: CAS No. 151-21-3;

[0054] Ethanol: CAS No. 64-17-5;

[0055] Testing items and methods:

[0056] Defoaming and foam suppression time: Take 50 mL of the specified standard foaming medium (5‰ ABS aqueous solution) using a stoppered graduated cylinder, add 0.03 g of defoamer sample under constant temperature of 150℃, stopper the bottle, shake the graduated cylinder up and down 50 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, which is the defoaming and foam suppression time of this shake flask; Centrifugal stability: Take 15 mL of defoamer sample and centrifuge at 3000 r / min for 30 min to observe its stability;

[0057] Coloring rate: The coloring rate of the fabric was tested at 150℃.

[0058] Examples 1-3

[0059] The specific raw material dosage of a high-temperature resistant defoamer used for polyester dyeing is shown in Table 1.

[0060] Table 1

[0061]

[0062] The nonionic surfactants are all alkyl glycosides. The raw materials of the polysiloxane-organosilicone rubber block copolymer include polysiloxane, organosilicone rubber, initiator, emulsifier and solvent. The weight ratio of polysiloxane, organosilicone rubber, initiator, emulsifier and solvent is shown in Table 2.

[0063] Table 2

[0064]

[0065] Example 1

[0066] A method for preparing a high-temperature resistant defoamer for polyester dyeing includes the following steps:

[0067] S1. Add rice bran wax and nonionic surfactant to deionized water, heat to 60℃ and mix and stir to obtain a mixed solution;

[0068] S2. Keeping the temperature constant, add the polysiloxane-organic silicone rubber block copolymer to the mixed solution and continue mixing and stirring for 1 hour to obtain the high-temperature resistant defoamer for polyester dyeing;

[0069] The preparation method of the polysiloxane-organosilicone rubber block copolymer in S2 includes the following steps:

[0070] Step 1: Dissolve the polysiloxane and silicone rubber in a solvent to form a homogeneous solution;

[0071] Step 2: Add an initiator to the homogeneous solution, heat to 65°C, mix and stir for 2 hours, cool to room temperature, filter, wash and dry to obtain the polysiloxane-organosilicone rubber block copolymer.

[0072] Example 2

[0073] A method for preparing a high-temperature resistant defoamer for polyester dyeing includes the following steps:

[0074] S1. Add rice bran wax and nonionic surfactant to deionized water, heat to 70℃ and mix and stir to obtain a mixed solution;

[0075] S2. Keeping the temperature constant, add the polysiloxane-organosilicone rubber block copolymer to the mixed solution and continue mixing and stirring for 1.5 hours to obtain the high-temperature resistant defoamer for polyester dyeing.

[0076] The preparation method of the polysiloxane-organosilicone rubber block copolymer in S2 includes the following steps:

[0077] Step 1: Dissolve the polysiloxane and silicone rubber in a solvent to form a homogeneous solution;

[0078] Step 2: Add an initiator to the homogeneous solution, heat to 85°C, mix and stir for 3 hours, cool to room temperature, filter, wash and dry to obtain the polysiloxane-organosilicone rubber block copolymer.

[0079] Example 3

[0080] A method for preparing a high-temperature resistant defoamer for polyester dyeing includes the following steps:

[0081] S1. Add rice bran wax and nonionic surfactant to deionized water, heat to 80℃ and mix and stir to obtain a mixed solution;

[0082] S2. Keeping the temperature constant, add the polysiloxane-organic silicone rubber block copolymer to the mixed solution and continue mixing and stirring for 2 hours to obtain the high-temperature resistant defoamer for polyester dyeing;

[0083] The preparation method of the polysiloxane-organosilicone rubber block copolymer in S2 includes the following steps:

[0084] Step 1: Dissolve the polysiloxane and silicone rubber in a solvent to form a homogeneous solution;

[0085] Step 2: Add an initiator to the homogeneous solution, heat to 90°C, mix and stir for 5 hours, cool to room temperature, filter, wash and dry to obtain the polysiloxane-organosilicone rubber block copolymer.

[0086] Examples 4-5

[0087] Based on Example 2, except for the different weight ratios of rice bran wax and nonionic surfactant, the other components and preparation methods are the same as in Example 2.

[0088] Example 4

[0089] The weight ratio of rice bran wax to nonionic surfactant is 1.2:1.

[0090] Example 5

[0091] The weight ratio of rice bran wax to nonionic surfactant is 2:1.

[0092] Comparative Example 1

[0093] Based on Example 2, except that an equal amount of polysiloxane is used to replace the polysiloxane-organosilicone rubber block copolymer, the other components and preparation methods are the same as in Example 2.

[0094] Comparative Example 2

[0095] Based on Example 2, except that an equal amount of silicone rubber is used to replace the polysiloxane-silicone rubber block copolymer, the other components and preparation methods are the same as in Example 2.

[0096] Comparative Example 3

[0097] Based on Example 2, except that an equal amount of rice bran wax was used to replace the nonionic surfactant, the other components and preparation methods were the same as in Example 2.

[0098] The defoamers prepared in Examples 1-5 and Comparative Examples 1-3 were subjected to performance testing, and the test results are shown in Table 3.

[0099] Table 3

[0100]

[0101] As can be seen from Examples 1-3, Comparative Examples 1-3 and Table 3, the high-temperature resistant defoamer for polyester dyeing prepared by this application using specific component raw materials has excellent comprehensive performance. It maintains good foam suppression performance and stability in high-temperature environments and will not cause defects such as uneven dyeing or dye spots. At the same time, it can assist the penetration of dyes and improve the processing efficiency and processing effect of polyester dyeing.

[0102] As can be seen from Examples 4-5, 2 and Table 3, the defoamer prepared by selecting a better ratio of rice bran wax and nonionic surfactant in this application has better high-temperature resistance.

[0103] As can be seen from Comparative Examples 1-2, Example 2, and Table 3, the defoamer prepared by the polysiloxane-organic silicone rubber block copolymer in this application has superior overall performance compared to defoamers prepared by using only polysiloxane or organic silicone rubber. It still exhibits excellent defoaming and foam-suppressing performance in high-temperature environments. The inventors speculate that the polysiloxane-organic silicone rubber block copolymer used in this application maintains stable physical and chemical properties in high-temperature environments, thereby effectively suppressing foam generation and stabilizing foam breakage during high-temperature dyeing. It has good foam-suppressing performance, effectively inhibiting foam generation; and it can penetrate to the fiber surface, enhancing the wettability and adhesion of the defoamer on the fiber surface, thereby better suppressing the retention of water molecules and air in the sizing on the fiber surface.

[0104] As can be seen from Comparative Example 3, Example 2 and Table 3, the nonionic surfactant added in this application can further enhance the defoaming performance of the defoamer and improve its stability.

[0105] Examples 6-8

[0106] Based on Example 2, except that an equal amount of spherical porous rice bran wax was used to replace the rice bran wax, the other components and preparation methods were the same as in Example 2.

[0107] Example 6

[0108] The specific surface area of ​​the spherical porous rice bran wax is 300m². 2 / g, with an average particle size of 50nm.

[0109] Example 7

[0110] The specific surface area of ​​the spherical porous rice bran wax is 420 m². 2 / g, with an average particle size of 260nm.

[0111] Example 8

[0112] The specific surface area of ​​the spherical porous rice bran wax is 560 m². 2 / g, with an average particle size of 500nm.

[0113] Examples 9-12

[0114] Based on Example 7, except for the different ionic surfactant, the other components and preparation methods are the same as in Example 7.

[0115] Example 9

[0116] Replace alkyl glycosides with an equal amount of fatty alcohol polyoxyethylene ether.

[0117] Example 10

[0118] The total weight of the nonionic surfactant is 13g. The nonionic surfactant includes alkyl glycosides and fatty alcohol polyoxyethylene ethers, wherein the weight ratio of alkyl glycosides to fatty alcohol polyoxyethylene ethers is 0.3:1.

[0119] Example 11

[0120] The total weight of the nonionic surfactant is 13g. The nonionic surfactant includes alkyl glycosides and fatty alcohol polyoxyethylene ethers, wherein the weight ratio of alkyl glycosides to fatty alcohol polyoxyethylene ethers is 0.4:1.

[0121] Example 12

[0122] The total weight of the nonionic surfactant is 13g. The nonionic surfactant includes alkyl glycosides and fatty alcohol polyoxyethylene ethers, wherein the weight ratio of alkyl glycosides to fatty alcohol polyoxyethylene ethers is 0.5:1.

[0123] Examples 13-15

[0124] Based on Example 11, except for the addition of titanium dioxide cellulose porous three-dimensional material, the other components and preparation methods are the same as in Example 11.

[0125] Example 13

[0126] The weight of the porous three-dimensional titanium dioxide cellulose material is 20% of the weight of the polysiloxane-organosilicone rubber block copolymer.

[0127] Example 14

[0128] The weight of the porous three-dimensional titanium dioxide cellulose material is 35% of the weight of the polysiloxane-organosilicone rubber block copolymer.

[0129] Example 15

[0130] The weight of the porous three-dimensional titanium dioxide cellulose material is 48% of the weight of the polysiloxane-organosilicone rubber block copolymer.

[0131] The defoamers prepared in Examples 6-15 were subjected to performance testing, and the test results are shown in Table 4.

[0132] Table 4

[0133] project Defoaming time / s Centrifugal stability Coloring rate % Example 6 3.27 Unlayered 41.06 Example 7 3.24 Unlayered 41.12 Example 8 3.25 Unlayered 41.08 Example 9 3.23 Unlayered 41.11 Example 10 3.18 Unlayered 41.28 Example 11 3.15 Unlayered 41.34 Example 12 3.16 Unlayered 41.31 Example 13 3.09 Unlayered 41.52 Example 14 3.04 Unlayered 41.65 Example 15 3.06 Unlayered 41.58

[0134] As can be seen from Examples 6-8, 2 and Table 4, the spherical porous rice bran wax used in this application has a high specific surface area and a small average particle size, which can further enhance the defoaming performance and stability of the defoamer. The inventors speculate that the large specific surface area of ​​the spherical porous rice bran wax can provide more active centers and adsorption sites, thereby enhancing the adsorption and destruction ability of foam. At the same time, the small average particle size can better penetrate into the fiber surface and slurry, improving the foam suppression effect.

[0135] As can be seen from Examples 9-12, 7 and Table 4, the nonionic surfactant of this application is a compound of alkyl glycoside and fatty alcohol polyoxyethylene ether, which can effectively reduce the surface tension of water, thereby enhancing the ability to destroy foam, and has excellent compatibility. The high-temperature resistant defoamer prepared for polyester dyeing has good stability; and the defoaming performance and stability of the high-temperature resistant defoamer can be further optimized, as well as the penetration and wetting performance of the defoamer can be improved, so that the defoamer can better penetrate into the fiber surface and inhibit the retention of water molecules on the fiber surface and air in the sizing.

[0136] As can be seen from Examples 13-15, 11 and Table 4, this application also adds titanium dioxide cellulose porous three-dimensional material, which has a high specific surface area and porous structure, can provide more adsorption sites and enhance the adsorption capacity for foam, and can maintain stable physical and chemical properties in high temperature environment, thereby inhibiting the generation of foam and stabilizing the breakage of foam during the dyeing process.

[0137] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the principles of this application should be covered within the scope of protection of this application.

Claims

1. A high-temperature resistant defoamer for polyester dyeing, characterized in that, The raw materials include the following parts by weight: 12-25 parts rice bran wax, 8-15 parts nonionic surfactant, 6-18 parts polysiloxane-organosilicon rubber block copolymer, and 35-60 parts deionized water. The raw materials of the polysiloxane-organosilicone rubber block copolymer include polysiloxane, organosilicone rubber, initiator, emulsifier and solvent in a weight ratio of 0.1-0.3:0.2-0.5:0.01-0.05:0.01-0.03:0.3-0.6; the nonionic surfactant is selected from one or more of alkyl glycosides or fatty alcohol polyoxyethylene ethers.

2. The high-temperature resistant defoamer for polyester dyeing according to claim 1, characterized in that, The weight ratio of the rice bran wax to the nonionic surfactant is 1.2-2:

1.

3. The high-temperature resistant defoamer for polyester dyeing according to claim 1, characterized in that, The rice bran wax is a spherical porous rice bran wax with a specific surface area of ​​300-560 m². 2 / g, with an average particle size of no more than 500nm.

4. The high-temperature resistant defoamer for polyester dyeing according to claim 1, characterized in that, The nonionic surfactant is selected from the alkyl glycoside and the fatty alcohol polyoxyethylene ether, and the weight ratio of the alkyl glycoside and the fatty alcohol polyoxyethylene ether is 0.3-0.5:

1.

5. The high-temperature resistant defoamer for polyester dyeing according to claim 1, characterized in that, It also includes a porous three-dimensional titanium dioxide cellulose material, the weight of which is 20-48% of the weight of the polysiloxane-organosilicone rubber block copolymer.

6. The high-temperature resistant defoamer for polyester dyeing according to claim 1, characterized in that, The initiator is benzoyl peroxide, the emulsifier is sodium dodecyl sulfate, and the solvent is ethanol.

7. A method for preparing a high-temperature resistant defoamer for polyester dyeing as described in claim 1, characterized in that, Includes the following steps: S1. Add rice bran wax and nonionic surfactant to deionized water, heat to 60-80℃ and mix and stir to obtain a mixed solution; S2. Keeping the temperature constant, add the polysiloxane-organosilicone rubber block copolymer to the mixed solution and continue mixing and stirring for 1-2 hours to obtain the high-temperature resistant defoamer for polyester dyeing.

8. The method for preparing the high-temperature resistant defoamer for polyester dyeing according to claim 7, characterized in that, The preparation method of the polysiloxane-organosilicone rubber block copolymer in S2 includes the following steps: Step 1: Dissolve the polysiloxane and silicone rubber in a solvent to form a homogeneous solution; Step 2: Add an initiator to the homogeneous solution, heat to 65-90℃, mix and stir for 2-5 hours, cool to room temperature, filter, wash and dry to obtain the polysiloxane-organosilicone rubber block copolymer.

9. The application of the high-temperature resistant defoamer for polyester dyeing as described in claim 1 in the dyeing of polyester, nylon, and cotton fabrics.

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