Preparation method of long-chain polyether modified organosiloxane

Abstract

The invention provides a preparation method of long-chain polyether modified organosiloxane. The preparation method specifically comprises the following steps: S1, heating propyl polyether ethyl ester, a stabilizer and a polymerization inhibitor in a reaction container, and carrying out heat preservation; and S2, adding a catalyst and polydimethylsiloxane, and carrying out a heating reaction to obtain the long-chain polyether modified organosiloxane. According to the preparation method, a branched chain is formed aiming at a traditional long-chain structure of siloxane, the compatibility of substances is improved, and the coating effect after film forming is improved. No redundant by-product is generated in the preparation process, and the yield is high. No waste gas and other gas influencing the ecological environment are generated in the production process, and the method has wide application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of organic synthesis, and in particular to a method for preparing long-chain polyether-modified organic siloxane. Background Art

[0002] Organic siloxane is a polymer composed of Si-O main chain and Si-C side chain. This molecular chain has good flexibility and can work in a wide range of ambient temperatures. It also has low surface tension and extremely low viscosity-temperature coefficient, which enables organic siloxane to maintain its basic properties at very extreme temperatures. It is usually used as a coating, surfactant, sealant, adhesive, defoaming agent, etc.

[0003] The compatibility of traditional siloxanes is not very good, especially with high oleophobicity, which will affect the gloss and adhesion of the coating, cause shrinkage, and affect the scope of use of siloxanes. In the production process, there will be excess by-products, which makes the output rate of the main product always low. In addition, the process is relatively complicated, so the production cost of traditional processes is high, which further increases the difficulty of obtaining products. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for preparing a long-chain polyether-modified organosiloxane. The method of the present invention is used to prepare the organosiloxane, and the prepared organosiloxane has better water solubility and oil solubility characteristics, and improves the surface tension of the coating.

[0005] The technical solution of the present invention is achieved in this way:

[0006] The present invention provides a method for preparing a long-chain polyether-modified organosiloxane, which specifically comprises the following steps:

[0007] S1: Place propyl polyether ethyl ester, stabilizer and polymerization inhibitor in a reaction vessel, heat and keep warm. During the heat preservation process, ensure that the powder reagents are evenly and completely dissolved.

[0008] S2: adding a catalyst and heating the polydimethylsiloxane to react to obtain the long-chain polyether-modified organosiloxane.

[0009] Further, the reaction equation is:

[0010]

[0011] Furthermore, the insulation condition in step S1 is 80-110° C., 3-6 h.

[0012] Furthermore, the reaction conditions in step S2 are 80-120° C., 2-4 h.

[0013] Furthermore, the feed mass ratio of polydimethylsiloxane and propyl polyether ethyl ester is 1.05-1.35:1; the embedding of carbon-oxygen double bonds in the main chain siloxane can improve its compatibility, increase the leveling performance of the coating, and prevent the coating from peeling due to uneven leveling.

[0014] Furthermore, in step S1, the amount of the reactive propyl polyether ethyl ester is 8-12 parts by mass, the amount of the stabilizer is 0.04-0.06 parts by mass, and the amount of the inhibitor is 0.05-0.15 parts by mass.

[0015] Furthermore, the catalyst in step S2 is a platinum catalyst, the amount used is 0.01-0.02 parts by mass, and the amount of polydimethylsiloxane used is 10-15 parts by mass.

[0016] Furthermore, the preparation method of the propyl polyether ethyl ester is:

[0017] S1-1: adding allyl polyether, acetic anhydride and stabilizer into a reactor and heating the reactor to carry out the first stage reaction;

[0018] S1-2: After the first stage of reaction is completed, vacuum is applied and the temperature is maintained to continue the reaction. After the reaction is completed, the propyl polyether ethyl ester is obtained.

[0019] The final product of the invention is a long-chain polyether-modified organic siloxane, which is obtained by addition reaction of a main-chain polydimethylsiloxane and a side-chain propyl polyether ethyl ester under the action of a catalyst. The main chain is prepared by polymerization of high-hydrogen silicone oil with cyclosiloxane and chain siloxane under the action of liquid acid ring opening to achieve chain extension and end-capping. The side chain is prepared by reaction of allyl polyether and acid anhydride.

[0020] Further, the reaction equation is:

[0021]

[0022] Furthermore, the reaction conditions in step S1-1 are 130-160° C., 1-2 h.

[0023] Furthermore, in step S1-1, the amount of allyl polyether used is 8-10 parts by mass, the amount of acetic anhydride used is 2-4 parts by mass, and the amount of stabilizer used is 0.05-0.15 parts by mass.

[0024] Furthermore, the stabilizer is one of sodium polyacrylate, hydroxypropyl cellulose and sodium carboxymethyl cellulose.

[0025] Furthermore, the polymerization inhibitor is one or more of 2,6-di-tert-butyl-p-cresol, antioxidant TH-1790, hydroquinone, and p-benzoquinone.

[0026] Furthermore, the vacuum degree in step S1-2 is -0.098--0.010 MPa.

[0027] Furthermore, the reaction conditions in step S1-2 are 130-160° C., 8-15 h.

[0028] Furthermore, the reaction end judgment condition in step S1-2 is 3200-3600cm -1 Whether the OH bond peak in the COH bond disappears.

[0029] Furthermore, the preparation method of the polydimethylsiloxane is:

[0030] S2-1: placing octamethylcyclotetrasiloxane, hexamethyldisiloxane, high hydrogen silicone oil and liquid acid catalyst in a reactor and heating to carry out the first stage reaction;

[0031] S2-2: After the first stage of reaction is completed, a neutralizing agent is added, the temperature is continued to be raised and a vacuum is drawn to carry out the reaction, and the polydimethylsiloxane is obtained after the reaction is completed.

[0032] Furthermore, the first stage reaction conditions in step S2-1 are 40-80°C, 4-5h; and the second stage reaction conditions in step S2-2 are 60-110°C, 4-8h.

[0033] Further, the reaction equation is:

[0034]

[0035] Furthermore, in step S2-1, the amount of octamethylcyclotetrasiloxane used is 8-12 parts by mass, the amount of hexamethyldisiloxane used is 0.8-1.2 parts by mass, the amount of high hydrogen silicone oil used is 0.7-1.5 parts by mass, and the amount of liquid acid catalyst used is 0.01-0.05 parts by mass.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. Form branched chains in the traditional long-chain structure of siloxane to increase the compatibility of the material and improve the coating effect after film formation.

[0038] 2. There are no extra by-products in the preparation process, and the yield is high. No waste gas or other gases that affect the ecological environment are generated during the production process. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Reagent Description:

[0041] Octamethylcyclotetrasiloxane: 200kg / barrel, Hubei Longsheng Sihai New Materials Co., Ltd.

[0042] Hexamethyldisiloxane: 200kg / barrel, Dow (Zhangjiagang) Investment Co., Ltd.

[0043] High hydrogen silicone oil: 200kg / barrel, Dow (Zhangjiagang) Investment Co., Ltd.

[0044] Allyl polyether: 200kg / barrel, Hai'an Petrochemical Plant, Jiangsu Province

[0045] Acetic anhydride: 200kg / barrel, Anhui Jinyueguan New Material Technology Co., Ltd.

[0046] Neutralizer (baking soda): 20kg / bag, Yankuang Lunan Chemical Co., Ltd.

[0047] Platinum catalyst: 100g / bottle, Shanghai Neutron Star Chemical Technology Co., Ltd.

[0048] Example 1

[0049] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst acetic acid are added into a reactor; the reaction temperature is controlled at 40°C, and after reacting for 4 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of acetic acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0050] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of sodium polyacrylate were added to the reactor; the temperature was raised to 130°C, and after reacting for 2 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 131°C, and the reaction was continued for 12 hours; the acid value of the solution was sampled and tested to be 0.27mgKOH / g, which was qualified, and propyl polyether ethyl ester was released.

[0051] Add 8 parts of propyl polyether ethyl ester, 0.05 parts of sodium polyacrylate and 0.1 parts of hydroquinone into the reactor; heat to 80°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take samples for infrared detection and pass the test, and detect the colorimetry as 1.6.

[0052] Example 2

[0053] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst acetic acid are added into a reactor; the reaction temperature is controlled at 50°C, and after reacting for 4 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of acetic acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0054] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of sodium polyacrylate were added to the reactor; the temperature was raised to 130°C, and after reacting for 2 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 132°C, and the reaction was continued for 12 hours; the acid value of the sampled solution was 0.26mgKOH / g, which was qualified. Propyl polyether ethyl ester was released.

[0055] Add 8 parts of propyl polyether ethyl ester, 0.05 parts of sodium polyacrylate and 0.1 parts of hydroquinone into the reactor; heat to 80°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take samples for infrared detection and pass, and detect the colorimetry as 2.0.

[0056] Example 3

[0057] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst sulfuric acid are added into a reactor; the reaction temperature is controlled at 52°C, and after reacting for 5 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of sulfuric acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01 MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0058] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of hydroxypropyl cellulose were added to the reactor; the temperature was raised to 130°C, and after reacting for 2 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 133°C, and the reaction was continued for 12 hours; the acid value of the sampled solution was 0.26mgKOH / g, which was qualified. Propyl polyether ethyl ester was released.

[0059] Add 8 parts of the propyl polyether ethyl ester, 0.05 parts of hydroxypropyl cellulose and 0.1 parts of 2,6-di-tert-butyl-p-cresol into the reactor; heat to 80°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of the polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take a sample for infrared detection and it is qualified, and the colorimetry is 2.3.

[0060] Example 4

[0061] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst sulfuric acid are added into a reactor; the reaction temperature is controlled at 60°C, and after reacting for 5 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of sulfuric acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01 MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0062] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of hydroxypropyl cellulose were added to the reactor; the temperature was raised to 130°C, and after reacting for 2 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 134°C, and the reaction was continued for 12 hours; the acid value of the sampled solution was 0.28mgKOH / g, which was qualified. Propyl polyether ethyl ester was released.

[0063] Add 8 parts of the propyl polyether ethyl ester, 0.05 parts of hydroxypropyl cellulose and 0.1 parts of 2,6-di-tert-butyl-p-cresol into the reactor; heat to 80°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of the polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take a sample for infrared detection and it is qualified, and the colorimetry is 2.8.

[0064] Example 5

[0065] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst sulfuric acid are added into a reactor; the reaction temperature is controlled at 45°C, and after reacting for 4 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of sulfuric acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01 MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0066] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of hydroxypropyl cellulose were added to the reactor; the temperature was raised to 140°C, and after reacting for 2 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 135°C, and the reaction was continued for 12 hours; the acid value of the sampled solution was 0.21mgKOH / g, which was qualified. Propyl polyether ethyl ester was released.

[0067] Add 8 parts of the propyl polyether ethyl ester, 0.05 parts of hydroxypropyl cellulose and 0.1 parts of antioxidant TH-1790 into the reactor; heat to 80°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of the polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take a sample for infrared detection and it is qualified, and the colorimetry is 2.2.

[0068] Example 6

[0069] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst phosphoric acid are added into a reactor; the reaction temperature is controlled at 45°C, and after reacting for 4 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of phosphoric acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01 MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0070] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of sodium carboxymethyl cellulose were added to the reactor; the temperature was raised to 150°C, and after reacting for 3 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 135°C, and the reaction was continued for 12 hours; the acid value of the sampled solution was 0.17mgKOH / g, which was qualified. Propyl polyether ethyl ester was released.

[0071] Add 8 parts of the propyl polyether ethyl ester, 0.05 parts of sodium carboxymethyl cellulose, and 0.1 parts of antioxidant TH-1790 into the reactor; raise the temperature to 80°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of the polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take a sample for infrared detection and it is qualified, and the colorimetry is 2.6.

[0072] Example 7

[0073] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst phosphoric acid are added into a reactor; the reaction temperature is controlled at 45°C, and after reacting for 4 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of phosphoric acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01 MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0074] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of sodium carboxymethyl cellulose were added to the reactor; the temperature was raised to 120°C, and after reacting for 2 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 135°C, and the reaction was continued for 12 hours; the acid value of the sampled solution was 0.30mgKOH / g, which was qualified. Propyl polyether ethyl ester was released.

[0075] Add 8 parts of the propyl polyether ethyl ester, 0.05 parts of sodium carboxymethyl cellulose and 0.1 parts of hydroquinone into the reactor; heat to 80°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take a sample for infrared detection and it is qualified, and the colorimetry is 1.8.

[0076] Example 8

[0077] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst phosphoric acid are added into a reactor; the reaction temperature is controlled at 45°C, and after reacting for 4 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of phosphoric acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01 MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0078] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of sodium polyacrylate were added to the reactor; the temperature was raised to 130°C, and after reacting for 2 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 135°C, and the reaction was continued for 12 hours; the acid value of the sampled solution was 0.25mgKOH / g, which was qualified. Propyl polyether ethyl ester was released.

[0079] Add 8 parts of propyl polyether ethyl ester, 0.05 parts of sodium polyacrylate and 0.1 parts of hydroquinone into the reactor; heat to 90°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take samples for infrared testing and pass the test, and the colorimetry is 2.2.

[0080] Example 9

[0081] 8 parts of octamethylcyclotetrasiloxane, 0.8 parts of hexamethyldisiloxane, 0.7 parts of high hydrogen silicone oil and 0.01 parts of liquid acid catalyst phosphoric acid are added into a reactor; the reaction temperature is controlled at 42°C, and after reacting for 4 hours, the liquid acid mixture is discharged; a neutralizing agent of 1.2 times of phosphoric acid is added, and the temperature begins to rise to 60°C, and the vacuum is gradually drawn to -0.01 MPa, and the reaction is carried out under negative pressure for 8 hours; after the reaction is completed, the temperature is lowered to obtain polydimethylsiloxane.

[0082] 8 parts of allyl polyether, 2 parts of acetic anhydride, and 0.1 parts of hydroxypropyl cellulose were added to the reactor; the temperature was raised to 130°C, and after reacting for 2 hours, a sample was taken to detect the infrared characteristic peak, which was qualified. The vacuum was slowly pumped to -0.098MPa, the temperature was maintained at 133°C, and the reaction was continued for 12 hours; the acid value of the sampled solution was 0.24mgKOH / g, which was qualified. Propyl polyether ethyl ester was released.

[0083] Add 8 parts of propyl polyether ethyl ester, 0.05 parts of hydroxypropyl cellulose and 0.1 parts of p-benzoquinone into the reactor; heat to 100°C and keep warm for 3 hours; add 0.01 parts of platinum catalyst and start high-speed stirring; add 10 parts of polydimethylsiloxane and control the temperature not to exceed 120°C; after reacting for 2 hours, take a sample for infrared detection and it is qualified, and the colorimetry is 2.9.

[0084] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a long-chain polyether-modified organosiloxane, characterized in that: The specific steps include: S1: placing propyl polyether ethyl ester, stabilizer and polymerization inhibitor in a reaction vessel, heating and keeping warm; S2: Add a catalyst and heat the polydimethylsiloxane to obtain a long-chain polyether-modified organosiloxane.

2. The method for preparing a long-chain polyether-modified organosiloxane according to claim 1, characterized in that: In step S1, the insulation condition is 80-110° C. for 3-6 hours; The reaction conditions in step S2 are 80-120° C., 2-4 h.

3. The method for preparing a long-chain polyether-modified organosiloxane according to claim 1, characterized in that: In step S1, the amount of the reactive propyl polyether ethyl ester is 8-12 parts by mass, the amount of the stabilizer is 0.04-0.06 parts by mass, and the amount of the inhibitor is 0.05-0.15 parts by mass.

4. The method for preparing a long-chain polyether-modified organosiloxane according to claim 1, characterized in that: The feed mass ratio of polydimethylsiloxane to propyl polyether ethyl ester is 1.05-1.35:

1.

5. The method for preparing a long-chain polyether-modified organosiloxane according to claim 1, characterized in that: The catalyst in step S2 is a platinum catalyst, the amount used is 0.01-0.02 parts by mass, and the amount of polydimethylsiloxane used is 10-15 parts by mass.

6. The method for preparing a long-chain polyether-modified organosiloxane according to claim 1, characterized in that: The preparation method of propyl polyether ethyl ester described in step S1 is: S1-1: adding allyl polyether, acetic anhydride and stabilizer into a reactor and heating the reactor to carry out the first stage reaction; S1-2: After the first stage of reaction is completed, vacuum is applied and the temperature is maintained to continue the reaction. After the reaction is completed, the propyl polyether ethyl ester is obtained.

7. The method for preparing a long-chain polyether-modified organosiloxane according to claim 6, characterized in that: The reaction conditions in step S1-1 are 130-160° C., 1-2 h; In step S1-1, the amount of allyl polyether used is 8-10 parts by mass, the amount of acetic anhydride used is 2-4 parts by mass, and the amount of stabilizer used is 0.05-0.15 parts by mass.

8. The method for preparing a long-chain polyether-modified organosiloxane according to claim 1, characterized in that: The preparation method of polydimethylsiloxane in step S2 is: S2-1: placing octamethylcyclotetrasiloxane, hexamethyldisiloxane, high hydrogen silicone oil and liquid acid catalyst in a reactor and heating to carry out the first stage reaction; S2-2: After the first stage of reaction is completed, a neutralizing agent is added, the temperature is continued to be raised and a vacuum is drawn to carry out the reaction, and the polydimethylsiloxane is obtained after the reaction is completed.

9. The method for preparing a long-chain polyether-modified organosiloxane according to claim 8, characterized in that: The first stage reaction conditions in step S2-1 are 40-80°C, 4-5h; The reaction conditions in step S2-2 are 60-110° C., 4-8 h.

10. The method for preparing a long-chain polyether-modified organosiloxane according to claim 8, characterized in that: In step S2-1, the amount of octamethylcyclotetrasiloxane used is 8-12 parts by mass, the amount of hexamethyldisiloxane used is 0.8-1.2 parts by mass, the amount of high hydrogen silicone oil used is 0.7-1.5 parts by mass, and the amount of liquid acid catalyst used is 0.01-0.05 parts by mass.

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