Weak coordination concerted catalysis hydrosilylation modified polyether and preparation method thereof

Abstract

The invention relates to the field of synthesis of organic silicon-polyether copolymers, and particularly discloses hydrosilylation modified polyether with weak coordination concerted catalysis and a preparation method of the hydrosilylation modified polyether. The invention relates to a preparation method of weak coordination concerted catalysis hydrosilylation modified polyether, which comprises the following steps of: reacting allyl polyethylene glycol and hydrogen-containing silicone oil serving as raw materials under the catalysis condition of a platinum catalyst under the participation of a functional aid until the color of a system is transparent, thereby obtaining the weak coordination concerted catalysis hydrosilylation modified polyether, the ratio of the addition amount of the functional additive to the weight of the allyl polyethylene glycol is (70-85): (450-500); the functional additive is hydroxy carboxylate or polyoxyethylene ether ammonium sulfate. According to the preparation method, 70-85 parts of hydroxyl carboxylate or polyoxyethylene ether ammonium sulfate can form a weak coordination concerted catalysis system with the platinum catalyst, the problem of high gelation rate which is difficult to overcome in the field is solved, the process does not need to add a neutralizing agent, the reaction rate is high, and meanwhile, the preparation method has the advantage that the surface tension can be reduced.

Description

Technical Field

[0001] This application relates to the field of synthesis of organosilicon-polyether copolymers, and more specifically, to a weakly coordinated synergistic catalytic hydrosilylation modified polyether and its preparation method. Background Technology

[0002] Hydrosilylation reaction is the main method for preparing organosilicon-polyether copolymers, and it is widely used in surfactants, textile finishing agents, polyurethane foam stabilizers and other fields. This reaction is usually catalyzed by platinum-based catalysts such as chloroplatinic acid, which adds hydrogen-containing silicone oil to allyl polyether.

[0003] However, existing technologies still face many challenges in actual production: 1. The sudden increase in viscosity in the later stages of the reaction leads to difficulties in mass transfer, low reaction efficiency, and a tendency to gel due to localized overheating, resulting in a high gelation rate. Expensive alkynyl alcohols are often added as inhibitors: at room temperature, alkynyl alcohols form stable complexes with platinum, inhibiting the reaction; upon heating, the complexes dissociate, releasing active platinum, allowing the reaction to proceed normally, thus preventing premature gelation and extending the operating time or shelf life; however, alkynyl alcohols are expensive and volatile, potentially requiring additional encapsulation or formulation adjustments.

[0004] Second, in order to address viscosity growth and mass transfer issues, some processes employ complex gradient temperature control, but this increases the difficulty and cost of process control.

[0005] Third, acidic byproducts (such as HCl) that may be generated during the reaction can corrode the equipment, requiring the addition of a neutralizing agent for treatment.

[0006] Therefore, developing a simple and economical preparation method that can effectively solve the problems of gelation, mass transfer, and equipment corrosion, and improve reaction efficiency and product quality, has become one of the urgent problems to be solved in the field of hydrosilylation modified polyethers. Summary of the Invention

[0007] To improve the high gelation rate problem in the hydrosilylation process for preparing modified polyethers without using alkynyl alcohols, this application provides a weakly coordinated synergistic catalytic hydrosilylation modified polyether and its preparation method.

[0008] In a first aspect, this application provides a method for preparing a weakly coordinated synergistically catalyzed hydrosilylation modified polyether, employing the following technical solution: A method for preparing a weakly coordinated synergistic catalytic hydrosilylation modified polyether involves reacting allyl polyethylene glycol and hydrogen-containing silicone oil as raw materials, with the participation of functional additives, under the catalytic condition of a platinum catalyst, until the system becomes transparent. The weight ratio of the added functional additive to allyl polyethylene glycol is 70-85:450-500. The functional additive is a hydroxycarboxylic acid salt or a polyoxyethylene ether ammonium sulfate salt.

[0009] By adopting the above technical solution, this application inventively discovers that, at a specific ratio of 70-85 parts of hydroxycarboxylate or polyoxyethylene ether ammonium sulfate (based on 450-500 parts of allyl polyethylene glycol), a weakly coordinated synergistic catalytic system can be formed with a platinum catalyst, simultaneously achieving multiple technical effects: 1. By utilizing the weak coordination between hydroxycarboxylate or polyoxyethylene ether ammonium sulfate and the central atom of the platinum catalyst, excessive cross-linking is mildly inhibited, preventing gelation at the source, and the gelation rate is significantly reduced. 2. The interfacial tension of the system was reduced, and the measured surface tension decreased from 38 mN / m to 29 mN / m; 3. No external neutralizing agent is required; the pH remains stable at 6.5-7.0, avoiding the corrosion of equipment by HCl in traditional processes. 4. The induction period is shortened. With the same amount of catalyst, the total reaction time is reduced from 6-8 hours in the traditional process to 3.5-4 hours, and the efficiency is improved by about 40-50%; the Si-H conversion rate is increased from the industry average of 95% to ≥97%. Optionally, the molar ratio of the allyl polyether to the hydrogen-containing silicone oil is 1:1.05-1.2, calculated as allyl:Si-H.

[0010] By adopting the above technical solution, the molar ratio of allyl to Si-H is controlled at 1:1.05-1.2, which ensures that Si-H is slightly in excess to ensure complete reaction of allyl, while avoiding excessive crosslinking density or side reactions caused by excessive Si-H. This ratio, combined with the weak coordination effect of functional additives, achieves precise control of reaction rate and product structure.

[0011] Optionally, the hydrogen content of the hydrogen-containing silicone oil is 0.3-0.5%.

[0012] By adopting the above technical solution, when the hydrogen content of the hydrogen-containing silicone oil is 0.3-0.5%, the crosslinking density of the system is moderate. If the hydrogen content is too low (<0.3%), there are insufficient crosslinking points, the molecular weight of the product is too low, and the performance does not meet the application requirements; if the hydrogen content is too high (>0.5%), the crosslinking density is too large, the viscosity increases sharply in the later stage of the reaction, and gelation is easily formed. This range is compatible with the weak coordination regulation effect of functional additives, so as to obtain modified polyether products with suitable molecular weight while ensuring the controllability of the reaction.

[0013] Optionally, the platinum catalyst is one of chloroplatinic acid, cassiterite catalyst, platinum-vinylsiloxane complex, or supported platinum catalyst.

[0014] Optionally, the specific steps of the preparation method are as follows: S1. Mix allyl polyether with functional additives and perform dehydration pretreatment; S2. After controlling the temperature of the dehydrated mixture to 83-87℃, add hydrogen-containing silicone oil and mix well. S3. Heat to 98-102℃, add platinum catalyst, and carry out hydrosilylation reaction. When the viscosity of the reaction system increases to 1.5-2.5 times the initial value, cool down to 88-92℃ and continue the reaction until the reactants are colorless and transparent, then terminate the reaction. S4. After the reaction is complete, the temperature is gradually reduced to obtain the hydrosilylation modified polyether.

[0015] By adopting the above technical solution—emphasizing a gradient temperature control process—a synergistic effect is achieved through "heating initiation - mid-process cooling rate control - gradient cooling post-treatment," combined with the weak coordination of functional additives. Gradient temperature control includes: heating to a first temperature of 98-102℃ to initiate the reaction and ensure catalytic activity; when the system viscosity increases to 1.5-2.5 times the initial viscosity, cooling to a second temperature of 88-92℃ to continue the reaction effectively controls the intense exothermic reaction in the initial stage, preventing gelation problems caused by local overheating; and using gradient cooling after the reaction to help stabilize the product structure and avoid stress or turbidity caused by sudden cooling. This reduces localized gelation problems caused by intense exothermic reactions in the initial stage, ensuring Si-H conversion rate and avoiding product yellowing (ΔYI < 0.5). Simultaneously, in conjunction with functional additives, it achieves the goal of high conversion rate and low gelation rate.

[0016] Optionally, the dehydration pretreatment in step S1 is as follows: under nitrogen protection, dehydrate at 110-130℃ for 90-150 min until the moisture content of the system is ≤200ppm.

[0017] By adopting the above technical solution, moisture acts as an inhibitor of the hydrosilylation reaction, and excessive moisture can lead to deactivation of the platinum catalyst or an increase in side reactions. This application achieves this by dehydrating the system at 110-130℃ under nitrogen protection for 90-150 minutes, strictly controlling the moisture content to ≤200ppm. This effectively avoids the interference of moisture on catalyst activity, ensuring the catalytic efficiency of the platinum catalyst and providing a fundamental guarantee for subsequent high conversion rates and short reaction times. Nitrogen protection prevents material oxidation and discoloration at high temperatures.

[0018] Optionally, the gradient cooling in step S4 is as follows: The temperature is reduced to 80℃ at a rate of 40℃ / h; The temperature was reduced from 80℃ to 50℃ at a rate of 60℃ / h.

[0019] By adopting the above technical solution—using segmented gradient cooling—first cooling to 80℃ at a slower rate (40℃ / h) allows the remaining small number of active centers to continue reacting steadily, avoiding incomplete reactions caused by rapid cooling; then cooling from 80℃ to 50℃ at a slightly faster rate (60℃ / h) improves production efficiency while ensuring product stability. This cooling strategy, combined with the weak coordination effect of functional additives, helps stabilize the product structure, maintain the product's colorlessness and transparency, and avoid viscosity fluctuations caused by differences in thermal history.

[0020] Secondly, this application provides a hydrosilylation-modified polyether, which adopts the following technical solution: A hydrosilylation-modified polyether is prepared by the above-described method for preparing hydrosilylation-modified polyethers with weak coordination synergistic catalysis.

[0021] By adopting the above technical solution, the hydrosilylation modified polyether prepared by the preparation method described in this application has the following excellent characteristics: Si-H conversion rate ≥97%, gelation rate <0.5%, the product is colorless and transparent (ΔYI<0.5), and the color can be maintained without the addition of additional antioxidants; the self-neutralization property of the reaction system avoids the residue of acidic substances, the product is pH neutral, and it can be directly used in subsequent application fields (such as surfactants, fabric finishing agents, polyurethane foam stabilizers, etc.) without post-processing.

[0022] Optional components may include the following parts by weight; 450-500 parts of allyl polyethylene glycol; Hydrogen-containing silicone oil: 262.5-333 parts; 70-85 parts of functional additives; Catalyst 0.2-0.3 parts; The functional additive is a hydroxycarboxylic acid salt or a polyoxyethylene ether ammonium sulfate salt.

[0023] By adopting the above technical solution: when the allyl polyethylene glycol is 450-500 parts, the functional additive hydroxycarboxylate or polyoxyethylene ether ammonium sulfate needs to be controlled at 70-85 parts; only when the functional additive is at the above dosage can the effects of reducing gelation rate, reducing surface tension of the system and improving reaction efficiency be guaranteed.

[0024] Furthermore, in this scheme, when the system viscosity allows, bulk polymerization can be carried out directly without adding solvents. The absence of solvents reduces volatilization issues, making it more environmentally friendly.

[0025] In summary, this application has the following beneficial effects: 1. The preparation method of this application uses hydroxycarboxylate or polyoxyethylene ether ammonium sulfate. At a specific ratio of 70-85 parts, the reaction rate is controlled by weak coordination, which reduces the gelation rate, reduces the surface tension of the system, neutralizes the by-product acid, and shortens the reaction induction period. The reaction time of the existing process is shortened from 6-8 hours to 3.5-4 hours, and the Si-H conversion rate is increased from the industry average of 95% to more than 97%. 2. The modified polyether in this application has a gelation rate that can be controlled below 0.5%, the product requires no filtration, and has a high yield. The reaction system maintains a stable pH in neutral, and the product is colorless and transparent, eliminating the need for additional antioxidants to prevent yellowing. 3. The modified polyether of this application exhibits self-neutralizing properties, preventing acidic substances from corroding the stainless steel reactor and extending the equipment's service life. Simultaneously, it eliminates the need for expensive dedicated inhibitors and neutralizing agents, reducing overall production costs. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the embodiments. The sources of each component in this application are as follows, and unless otherwise specified below, the components are derived from commercially available products: Allyl polyethylene glycol: purchased from Yangzhou Chenhua New Material Co., Ltd., model FAE-10; Hydrogen-containing silicone oil 202H036: purchased from Zhejiang Weifeng New Materials Co., Ltd., model 202H036; Methyl hydrogen-containing cyclic siloxane: purchased from Zhejiang Runhe Organosilicon New Materials Co., Ltd., model D4H; Sodium citrate (hydroxycarboxylic acid salt): analytical grade, purchased from Sinopharm Group; Sodium gluconate (hydroxycarboxylate): analytical grade, purchased from Sinopharm Group; Vinyl platinum catalyst (platinum-vinylsiloxane complex), model KB-5000, platinum content 5000ppm, purchased from Dongguan Kebei Silicone Materials Co., Ltd. Fatty alcohol polyoxyethylene ether ammonium sulfate (polyoxyethylene ether ammonium sulfate salt): Industrial grade, brand: Solvay. Example 1

[0027] A weakly coordinated synergistic catalytic hydrosilylation modified polyether, the components and their corresponding weights are shown in Table 1, and it is prepared by the following steps: S1. Allyl polyethylene glycol is mixed with functional additive hydroxycarboxylate (sodium citrate) and dehydrated at 130°C under nitrogen protection for 90 minutes until the moisture content is ≤200ppm to obtain a mixture. S2. After controlling the temperature of the dehydrated mixture to 83℃, add methyl hydrogen cyclic siloxane D4H and stir at 300 rpm for 10 min. S3. Heat to 98°C, add catalyst solution (isopropanol solution of vinyl platinum catalyst KB5000) to carry out hydrosilylation reaction. When the viscosity of the reaction system increases to 1.5 times the initial value, cool down to 88°C and continue the reaction until the reactants are colorless and transparent. S4. After the reaction is complete, the temperature is gradually reduced: first, the temperature is reduced to 80℃ at a rate of 35℃ / h, and then reduced to 50℃ from 80℃ at a rate of 55℃ / h to obtain the hydrosilylation modified polyether.

[0028] It should be noted that the catalyst solution is obtained by dispersing the catalyst in a solvent. The catalyst can be selected from chloroplatinic acid, castor catalyst, platinum-vinylsiloxane complex, and supported platinum catalyst. The solvent can be selected from isopropanol, n-butanol, and ethylene glycol monomethyl ether. The embodiments of this application only use one of them as an example for brief introduction. The other selections mentioned above do not have a significant impact on the detection data of this application, nor do they affect the application of other catalysts and solvents in this application. Similarly, the hydrogen-containing silicone oil can also be a branched hydrogen-containing silicone oil. Example 2

[0029] A weakly coordinated synergistic catalytic hydrosilylation modified polyether, the components and their corresponding weights are shown in Table 1, and it is prepared by the following steps: S1. Allyl polyethylene glycol is mixed with functional additive hydroxycarboxylate (sodium gluconate) and dehydrated at 120°C under nitrogen protection for 120 minutes until the moisture content is ≤200ppm to obtain a mixture. S2. After controlling the temperature of the dehydrated mixture to 85℃, add hydrogen-containing silicone oil and stir at 400 rpm for 10 minutes. S3. Heat to 100℃, add catalyst solution (isopropanol solution of vinyl platinum catalyst KB5000) to carry out hydrosilylation reaction. When the viscosity of the reaction system increases to twice the initial value, cool down to 90℃ and continue the reaction until the reactants are colorless and transparent. S4. After the reaction is complete, the temperature is gradually reduced: first, the temperature is reduced to 80℃ at a rate of 40℃ / h, and then reduced from 80℃ to 50℃ at a rate of 60℃ / h to obtain the hydrosilylation modified polyether. Example 3

[0030] A weakly coordinated synergistic catalytic hydrosilylation modified polyether, the components and their corresponding weights are shown in Table 1, and it is prepared by the following steps: S1. Allyl polyethylene glycol is mixed with functional additive polyoxyethylene ether ammonium sulfate (fatty alcohol polyoxyethylene ether ammonium sulfate), and dehydrated at 110°C under nitrogen protection for 150 minutes until the moisture content is ≤200ppm to obtain a mixture. S2. After controlling the temperature of the dehydrated mixture to 87°C, add hydrogen-containing silicone oil and stir at 500 rpm for 10 minutes. S3. Heat to 98°C, add catalyst solution (isopropanol solution of vinyl platinum catalyst KB5000) to carry out hydrosilylation reaction. When the viscosity of the reaction system increases to 2.5 times the initial value, cool down to 92°C to continue the reaction until the reactants are colorless and transparent, then terminate the reaction. S4. After the reaction is complete, the temperature is gradually reduced: first, the temperature is reduced to 80℃ at a rate of 45℃ / h, and then reduced from 80℃ to 50℃ at a rate of 65℃ / h to obtain the hydrosilylation modified polyether.

[0031] Comparative Examples 1-2

[0032] A hydrosilylation modified polyether differs from Example 2 in that the amount of functional additives used is different, as detailed in Table 1.

[0033] Table 1. Components and their weights (kg) in Examples 1-3 and Comparative Examples 1-2 Components Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Allyl polyethylene glycol 450 495 500 495 495 Hydrogen-containing silicone oil 262.5 302.5 333 302.5 302.5 Functional additives (sodium citrate / sodium gluconate / ammonium sulfate of fatty alcohol polyoxyethylene ether) 70 72 85 60 90 Vinyl Platinum Catalyst 0.2 0.25 0.3 0.25 0.25 solvent 3 5 8 5 5 The molar ratio of allyl polyether to hydrogen-containing silicone oil, expressed as allyl:Si-H, is given. 1:1.05 1:1.1 1:1.2 1:1.1 1:1.1 Comparative Example 3

[0034] A hydrosilylation modified polyether, which differs from Example 2 in that sodium gluconate is not added.

[0035] Comparative Example 4

[0036] A hydrosilylation modified polyether differs from Example 2 in that sodium gluconate is not added, and an equal amount of sodium styrene sulfonate is used instead of sodium gluconate.

[0037] Comparative Example 5

[0038] A hydrosilylation modified polyether differs from Example 2 in that sodium gluconate is not added, and an equal amount of sodium dodecyl sulfonate is used instead of sodium gluconate.

[0039] Comparative Example 6

[0040] A hydrosilylation modified polyether differs from Example 2 in that steps S3 and S4 are different, as detailed below: S3. Heat to 100℃, add catalyst solution (isopropanol solution of vinyl platinum catalyst KB5000) to carry out hydrosilylation reaction, and terminate the reaction when the reactant becomes colorless and transparent. S4. After the reaction is complete, hydrosilylation modified polyether is obtained.

[0041] Performance testing

[0042] The hydrosilylation modified polyethers prepared in the examples and comparative examples were subjected to the following performance tests, and the test results are recorded in Table 2.

[0043] Detection methods

[0044] 1. Viscosity: Using a No. 4 viscosity cup, the time (in seconds) for a certain volume of sample to flow out is measured under constant temperature conditions of 25℃.

[0045] 2. Si-H conversion rate: Fourier transform infrared spectroscopy (FTIR) was used to monitor the Si-H bond concentration at 2140 cm⁻¹. -1 The conversion rate is calculated by analyzing the disappearance of characteristic peaks at a given location and the peak area.

[0046] 3. Reaction time: The time (in hours) from the addition of the catalyst to the reaction reaching its endpoint (using iodometric titration).

[0047] 4. Gel phenomenon: Visually inspect the reaction product for gel particles. Filter the product through a 100-mesh filter, weigh the gel particles on the filter, and calculate their percentage of the total theoretical product mass.

[0048] 5. Surface tension: The surface tension (mN / m) of the sample was measured using a surface tension meter at 25°C.

[0049] 6. Color: Use a colorimeter to measure the change in yellowness index of the sample according to standard methods.

[0050] Table 2 Performance Test Results project Viscosity Si-H conversion rate (m%) Reaction time (h) Gelation phenomenon and gelation rate (%) Surface tension (mN / m) color Example 1 52 seconds (cup #4) 97 3.5 No gelling phenomenon 29 Colorless and transparent (ΔYI < 0.5) Example 2 52 seconds (cup #4) 99.2 3.5 No gelling phenomenon 29 Colorless and transparent (ΔYI < 0.5) Example 3 52 seconds (cup #4) 99.5 3.5 No gelling phenomenon 29 Colorless and transparent (ΔYI < 0.5) Comparative Example 1 Fluctuation ±8% 89 5.8 Gelation rate ≈ 6.1% 31 Colorless and transparent (ΔYI < 0.5) Comparative Example 2 Fluctuation ±7% 91 5.8 Gelation rate ≈ 5.7% 27 Colorless and transparent (ΔYI < 0.5) Comparative Example 3 Fluctuation ±9% 93 5.8 Gelation rate ≈ 1.2% 33 Yellowing (ΔYI>3.0) Comparative Example 4 Fluctuation ±12% 89 5.8 Gelation rate ≈ 1.5% 36 Yellowing (ΔYI>3.0) Comparative Example 5 Fluctuation ±15% 87 5.8 Gelation rate ≈ 4.8% 38 Contains visible gel particles (ΔYI > 3.0) Comparative Example 6 The viscosity increases sharply in the later stages (aggregation). 91 5.8 Gelation rate ≈ 10% 38 Contains visible gel particles (ΔYI > 3.0) Note: Colorless and transparent means ΔYI < 0.5.

[0051] Referring to Table 2, Examples 1-3, due to the addition of 70-85 parts of the functional additives described in this application during the preparation process, significantly reduced reaction time, increased Si-H conversion rate, eliminated gelation, reduced surface tension, and improved color. Furthermore, the reaction system was self-buffered, eliminating the need for additional neutralizing agents. When the amount of additive was less than 70 parts in Comparative Example 1, or more than 85 parts in Comparative Example 2, the aforementioned overall effects deteriorated. In Comparative Example 3, with no additives, all properties were degraded.

[0052] Compared with Comparative Examples 1 and 4-5, using common anionic surfactants such as sodium styrene sulfonate or sodium dodecyl sulfonate (SDS) instead of the hydroxycarboxylate or polyoxyethylene ether ammonium sulfate of this application can also reduce surface tension, but it cannot effectively inhibit gelation and neutralize by-product acids (the product turns yellow and the pH decreases). The overall effect is far inferior to the hydroxycarboxylate or polyoxyethylene ether ammonium sulfate of this application; and when using SDS, an additional buffer should be added.

[0053] Comparing Example 1 and Comparative Example 6, even with the use of the functional additives of this application, problems such as gelation, low conversion rate, and product yellowing still occur if the reaction temperature is not properly controlled (Comparative Example 6). This indicates that the method of this application (functional additives + gradient temperature control) is a complete technical solution, and the two work synergistically to achieve the best results.

[0054] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A method for preparing a weakly coordinated synergistically catalyzed hydrosilylation modified polyether, characterized in that, The product is obtained by reacting allyl polyethylene glycol and hydrogen-containing silicone oil as raw materials, with the participation of functional additives and the catalysis of platinum catalyst until the system becomes transparent. The weight ratio of the added functional additive to allyl polyethylene glycol is 70-85:450-500. The functional additive is a hydroxycarboxylic acid salt or a polyoxyethylene ether ammonium sulfate salt.

2. The method for preparing a weakly coordinated synergistically catalyzed hydrosilylation modified polyether according to claim 1, characterized in that: The molar ratio of the allyl polyether to the hydrogen-containing silicone oil is 1:1.05-1.2, calculated as allyl:Si-H.

3. The method for preparing a weakly coordinated synergistically catalyzed hydrosilylation modified polyether according to claim 2, characterized in that: The hydrogen content of the hydrogen-containing silicone oil is 0.3-0.5%.

4. The method for preparing a weakly coordinated synergistic catalytic hydrosilylation modified polyether according to claim 2, characterized in that: The platinum catalyst is one of chloroplatinic acid, cassiterite catalyst, platinum-vinylsiloxane complex, or supported platinum catalyst.

5. The method for preparing a weakly coordinated synergistically catalyzed hydrosilylation modified polyether according to claim 1, characterized in that, The specific steps of the preparation method are as follows: S1. Mix allyl polyether with functional additives and perform dehydration pretreatment; S2. After controlling the temperature of the dehydrated mixture to 83-87℃, add hydrogen-containing silicone oil and mix well. S3. Heat to 98-102℃, add platinum catalyst, and carry out hydrosilylation reaction. When the viscosity of the reaction system increases to 1.5-2.5 times the initial value, cool down to 88-92℃ and continue the reaction until the reactants are colorless and transparent, then terminate the reaction. S4. After the reaction is complete, the temperature is gradually reduced to obtain the hydrosilylation modified polyether.

6. The method for preparing a weakly coordinated synergistically catalyzed hydrosilylation modified polyether according to claim 5, characterized in that: The dehydration pretreatment in step S1 is as follows: under nitrogen protection, dehydrate at 110-130℃ for 90-150 min until the moisture content of the system is ≤200ppm.

7. The method for preparing a weakly coordinated synergistically catalyzed hydrosilylation modified polyether according to claim 5, characterized in that, The gradient cooling in step S4 is as follows: The temperature is reduced to 80℃ at a rate of 40℃ / h; The temperature was reduced from 80℃ to 50℃ at a rate of 60℃ / h.

8. A hydrosilylation-modified polyether, prepared by the method for preparing the weakly coordinated synergistic catalytic hydrosilylation-modified polyether according to any one of claims 1-7.

9. The hydrosilylation modified polyether according to claim 8, characterized in that: It includes the following components in parts by weight; 450-500 parts of allyl polyethylene glycol; Hydrogen-containing silicone oil: 262.5-333 parts; 70-85 parts of functional additives; Catalyst 0.2-0.3 parts; The functional additive is a hydroxycarboxylic acid salt or a polyoxyethylene ether ammonium sulfate salt.