A wetting agent and preparation method thereof

Abstract

The invention relates to the technical field of wetting agent preparation methods, and provides a wetting agent and a preparation method thereof. The invention modifies acetylene glycol by maleic anhydride, thereby reducing and improving the water solubility of acetylene glycol, and the acetylene glycol modified by maleic anhydride has lower surface tension, low foaming property, easy water solubility and good dispersibility. Secondly, low hydrogen-containing silicone oil is modified by butynediol diethoxy ether to obtain modified polysiloxane, which can greatly reduce the surface tension of water, and the contact angle of the modified polysiloxane is less than 90 degrees, and the modified polysiloxane has better wetting and spreading performance on a hydrophobic interface. Finally, the modified acetylene glycol and the modified polysiloxane are compounded with anionic surfactant sodium lauryl sulfate and zwitterionic surfactant dodecyl dimethyl betaine, so that synergistic effect can occur between them, thereby enhancing the wetting performance of the wetting agent.

Description

Technical Field

[0001] The invention relates to the technical field of wetting agent preparation methods, and in particular to a wetting agent and a preparation method thereof. Background Art

[0002] A substance that can make solid materials more easily wetted by water, by reducing its surface tension or interfacial tension, so that water can spread on the surface of the solid material, or penetrate into its surface, thereby wetting the solid material. Wetting agents are surfactants, which are composed of hydrophilic groups and lipophilic groups. When in contact with the solid surface, the lipophilic group adheres to the solid surface, and the hydrophilic group of the wetting agent extends outward into the liquid, so that the liquid forms a continuous phase on the solid surface. This is the basic principle of wetting.

[0003] Currently, there are few wetting agents with good wetting effects on the market, and they cannot effectively reduce surface tension. Therefore, how to prepare a wetting agent with good wetting properties has become a technical problem that needs to be urgently solved by technicians in this field. Summary of the invention

[0004] Technical issues solved

[0005] In view of the deficiencies in the prior art, the present invention provides a wetting agent and a preparation method thereof, aiming to enable it to solve the problems raised in the background technology.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A wetting agent, comprising, by weight: 35-38 parts of modified acetylene glycol, 26-28 parts of modified polysiloxane, 15-16 parts of sodium lauryl sulfate, 8-10 parts of dodecyl dimethyl betaine and 28-30 parts of deionized water;

[0009] The modified acetylene glycol is prepared by modifying acetylene glycol with maleic anhydride, and the modified polysiloxane is prepared by modifying low-hydrogen silicone oil with butynediol diethoxy ether.

[0010] Furthermore, the preparation method of the modified acetylene glycol comprises the following steps:

[0011] Step 1, weighing 45-50 parts by weight of acetylenediol, 38-42 parts by weight of maleic anhydride and 8-9 parts by weight of anhydrous sodium carbonate for standby use;

[0012] Step 2, pour the acetylene glycol into a beaker and heat it to 65°C, then pour the maleic anhydride into the beaker to melt, slowly add anhydrous sodium carbonate, stir evenly and react for 4-5 hours;

[0013] Step 3, adding an extraction aid to the system in step 2 for extraction, filtering after the extraction, and evaporating the solvent to obtain a yellow solid;

[0014] Step 4: Wash the yellow solid in step 3 with acetone, filter it after washing three times, and add anhydrous ethanol to extract the filtered solid again. After ethanol is evaporated, the modified acetylene glycol is obtained.

[0015] Furthermore, in step 2, the stirring speed is 120-150 r / min.

[0016] Furthermore, the extraction aid in step 3 is anhydrous ethanol or acetone.

[0017] Furthermore, the preparation method of the low hydrogen silicone oil is: weigh 25-26 parts by weight of high hydrogen silicone oil, 120-122 parts by weight of octamethylcyclotetrasiloxane and 33-35 parts by weight of hexamethyldisiloxane, add them into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, then add 5-6 parts by weight of concentrated sulfuric acid for catalysis, and heat to 60-65° C. for reaction for 6 hours; after the reaction is completed, cool to 25° C., and slowly add 3-5 parts of sodium bicarbonate powder, stir evenly and neutralize the reaction liquid to a pH value of 6-7, finally vacuum filter to remove solids, and remove low boiling points at 80° C. for 1 hour. The resulting colorless and transparent oily liquid is the low hydrogen silicone oil.

[0018] Furthermore, the preparation method of the modified polysiloxane comprises the following steps:

[0019] Step a, weighing 55-60 parts by weight of low hydrogen silicone oil and 50-55 parts by weight of butynediol diethoxy ether and adding them into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then adding an appropriate amount of chloroplatinic acid-isopropanol solution thereto and stirring and mixing;

[0020] Step b, introducing nitrogen into the four-necked flask in step a for protection, heating to 130° C. in an oil bath for reaction for 2-3 hours, then cooling to room temperature for discharging;

[0021] Step c: The material discharged from step b is subjected to rotary evaporation at 80° C. for 30 minutes to remove the solvent and low-boiling substances, and the obtained light yellow transparent liquid is the modified polysiloxane.

[0022] Furthermore, the amount of chloroplatinic acid-isopropanol solution used in step a is 100 ppm (calculated as Pt mass / total reaction solution mass).

[0023] Furthermore, in step a, the stirring speed is 100-110 r / min, and the stirring time is 20-30 min.

[0024] A method for preparing a wetting agent, the preparation method comprising the following steps:

[0025] S1. Weigh modified acetylene glycol, modified polysiloxane, sodium lauryl sulfate, dodecyl dimethyl betaine and deionized water according to the above weight parts for later use;

[0026] S2, pouring the modified acetylene glycol and the modified polysiloxane into a reaction vessel filled with deionized water, adding sodium lauryl sulfate under stirring at a speed of 400-600 r / min, continuing to stir evenly for 10-15 min, and adding dodecyl dimethyl betaine during stirring, and continuing to stir for 10-12 min;

[0027] S3. Adjust the stirring speed in S2 to 1000-1200 r / min, stir for 20-30 min and then disperse by ultrasonic, and the obtained product is the wetting agent.

[0028] Furthermore, the temperature condition in S2 is 30-35° C., the frequency of ultrasonic dispersion in S3 is 22-30 KHz, and the ultrasonic dispersion time is 10 min.

[0029] Beneficial Effects

[0030] The present invention provides a wetting agent and a preparation method thereof. Compared with the prior art, the present invention has the following beneficial effects:

[0031] The invention modifies acetylene glycol by maleic anhydride, thereby reducing and improving the water solubility of acetylene glycol, and the acetylene glycol modified by maleic anhydride has lower surface tension, low foaming property, easy water solubility and good dispersibility. Secondly, low hydrogen silicone oil is modified by butynediol diethoxy ether to obtain modified polysiloxane, which can greatly reduce the surface tension of water, and the contact angle of the modified polysiloxane is less than 90 degrees, and has better wetting and spreading performance on the hydrophobic interface. Finally, the modified acetylene glycol and the modified polysiloxane are compounded with anionic surfactant sodium dodecyl sulfate and zwitterionic surfactant dodecyl dimethyl betaine, so that synergistic effect can be generated between them, thereby enhancing the wetting performance of the wetting agent. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely below. 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.

[0033] Embodiment 1:

[0034] A wetting agent of this embodiment includes, by weight, 35 parts of modified acetylene glycol, 26 parts of modified polysiloxane, 15 parts of sodium lauryl sulfate, 8 parts of dodecyl dimethyl betaine and 28 parts of deionized water;

[0035] The modified acetylene glycol is prepared by modifying acetylene glycol with maleic anhydride, and the modified polysiloxane is prepared by modifying low hydrogen-containing silicone oil with butynediol diethoxy ether.

[0036] The preparation method of modified acetylenic diol comprises the following steps:

[0037] Step 1, weigh 45 parts by weight of acetylenediol, 38 parts by weight of maleic anhydride and 8 parts by weight of anhydrous sodium carbonate for use;

[0038] Step 2, pour the acetylene glycol into a beaker and heat it to 65° C., then pour the maleic anhydride into the beaker to melt, slowly add anhydrous sodium carbonate, stir evenly and react for 4 hours;

[0039] Step 3, adding an extraction aid to the system in step 2 for extraction, filtering after the extraction, and evaporating the solvent to obtain a yellow solid;

[0040] Step 4: Wash the yellow solid in step 3 with acetone, filter it after washing three times, and add anhydrous ethanol to extract the filtered solid again. After ethanol is evaporated, the modified acetylene glycol is obtained.

[0041] The stirring speed in step 2 is 120 r / min.

[0042] The extraction aid in step 3 is anhydrous ethanol or acetone.

[0043] The preparation method of low hydrogen silicone oil is as follows: 25 parts by weight of high hydrogen silicone oil, 120 parts by weight of octamethylcyclotetrasiloxane and 33 parts by weight of hexamethyldisiloxane are weighed and added into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then 5 parts by weight of concentrated sulfuric acid are added for catalysis, and the mixture is heated to 60°C for reaction for 6 hours; after the reaction is completed, the mixture is cooled to 25°C, and 3% sodium bicarbonate powder is slowly added, and the pH value of the reaction liquid is neutralized to 6 after stirring evenly, and finally, the solid is removed by vacuum filtration, and low boiling substances are removed by rotary evaporation at 80°C for 1 hour, and the obtained colorless and transparent oily liquid is the low hydrogen silicone oil.

[0044] The preparation method of modified polysiloxane comprises the following steps:

[0045] Step a, weighing 55 parts by weight of low-hydrogen silicone oil and 50 parts by weight of butynediol diethoxy ether, adding them into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then adding an appropriate amount of chloroplatinic acid-isopropanol solution thereto and stirring and mixing;

[0046] Step b, introducing nitrogen into the four-necked flask in step a for protection, heating to 130° C. in an oil bath for reaction for 2 h, then cooling to room temperature for discharging;

[0047] Step c: The material discharged from step b is subjected to rotary evaporation at 80° C. for 30 minutes to remove the solvent and low-boiling substances, and the obtained light yellow transparent liquid is the modified polysiloxane.

[0048] The dosage of chloroplatinic acid-isopropanol solution in step a is 100 ppm (based on Pt mass / total mass of reaction solution).

[0049] The stirring speed in step a is 100 r / min and the stirring time is 20 min.

[0050] A method for preparing a wetting agent, the preparation method comprising the following steps:

[0051] S1. Weigh modified acetylene glycol, modified polysiloxane, sodium lauryl sulfate, dodecyl dimethyl betaine and deionized water according to the above weight parts for later use;

[0052] S2, pouring the modified acetylene glycol and the modified polysiloxane into a reaction vessel filled with deionized water, adding sodium lauryl sulfate under stirring at a speed of 400 r / min, continuing to stir evenly for 10 minutes, and adding dodecyl dimethyl betaine during stirring, and continuing to stir for 10 minutes;

[0053] S3. Adjust the stirring speed in S2 to 1000 r / min, stir for 20 minutes and then perform ultrasonic dispersion to obtain the wetting agent.

[0054] The temperature condition in S2 was 30° C., the frequency of ultrasonic dispersion in S3 was 22 KHz, and the ultrasonic dispersion time was 10 min.

[0055] Embodiment 2:

[0056] A wetting agent of this embodiment includes, by weight, 38 parts of modified acetylene glycol, 28 parts of modified polysiloxane, 16 parts of sodium lauryl sulfate, 10 parts of dodecyl dimethyl betaine and 30 parts of deionized water;

[0057] The modified acetylene glycol is prepared by modifying acetylene glycol with maleic anhydride, and the modified polysiloxane is prepared by modifying low hydrogen-containing silicone oil with butynediol diethoxy ether.

[0058] The preparation method of modified acetylenic diol comprises the following steps:

[0059] Step 1, weigh 50 parts by weight of acetylenediol, 42 parts by weight of maleic anhydride and 9 parts by weight of anhydrous sodium carbonate for use;

[0060] Step 2, pour the acetylene glycol into a beaker and heat it to 65° C., then pour the maleic anhydride into the beaker to melt, and slowly add anhydrous sodium carbonate, stir evenly and react for 5 hours;

[0061] Step 3, adding an extraction aid to the system in step 2 for extraction, filtering after the extraction, and evaporating the solvent to obtain a yellow solid;

[0062] Step 4: Wash the yellow solid in step 3 with acetone, filter it after washing three times, and add anhydrous ethanol to extract the filtered solid again. After ethanol is evaporated, the modified acetylene glycol is obtained.

[0063] The stirring speed in step 2 is 150r / min.

[0064] The extraction aid in step 3 is anhydrous ethanol or acetone.

[0065] The preparation method of low hydrogen silicone oil is as follows: 26 parts by weight of high hydrogen silicone oil, 122 parts by weight of octamethylcyclotetrasiloxane and 35 parts by weight of hexamethyldisiloxane are weighed and added into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then 6 parts by weight of concentrated sulfuric acid are added for catalysis, and the mixture is heated to 65°C for reaction for 6 hours; after the reaction is completed, the mixture is cooled to 25°C, and 5% sodium bicarbonate powder is slowly added, and the pH value of the reaction liquid is neutralized to 7 after stirring evenly, and finally, the solid is removed by vacuum filtration, and low boiling substances are removed by rotary evaporation at 80°C for 1 hour, and the obtained colorless and transparent oily liquid is the low hydrogen silicone oil.

[0066] The preparation method of modified polysiloxane comprises the following steps:

[0067] Step a, weighing 60 parts by weight of low-hydrogen silicone oil and 55 parts by weight of butynediol diethoxy ether, adding them into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then adding an appropriate amount of chloroplatinic acid-isopropanol solution thereto and stirring and mixing;

[0068] Step b, introducing nitrogen into the four-necked flask in step a for protection, heating to 130° C. in an oil bath for reaction for 3 h, then cooling to room temperature for discharging;

[0069] Step c: The material discharged from step b is subjected to rotary evaporation at 80° C. for 30 minutes to remove the solvent and low-boiling substances, and the obtained light yellow transparent liquid is the modified polysiloxane.

[0070] The dosage of chloroplatinic acid-isopropanol solution in step a is 100 ppm (based on Pt mass / total mass of reaction solution).

[0071] The stirring speed in step a is 110 r / min and the stirring time is 30 min.

[0072] A method for preparing a wetting agent, the preparation method comprising the following steps:

[0073] S1. Weigh modified acetylene glycol, modified polysiloxane, sodium lauryl sulfate, dodecyl dimethyl betaine and deionized water according to the above weight parts for later use;

[0074] S2, pouring the modified acetylene glycol and the modified polysiloxane into a reaction vessel filled with deionized water, adding sodium lauryl sulfate under stirring at a speed of 600 r / min, continuing to stir evenly for 15 minutes, and adding dodecyl dimethyl betaine during stirring, and continuing to stir for 12 minutes;

[0075] S3. Adjust the stirring speed in S2 to 1200 r / min, stir for 30 min and then perform ultrasonic dispersion to obtain the wetting agent.

[0076] The temperature condition in S2 was 35° C., the frequency of ultrasonic dispersion in S3 was 30 KHz, and the ultrasonic dispersion time was 10 min.

[0077] Embodiment 3:

[0078] A wetting agent of this embodiment includes, by weight, 36 parts of modified acetylene glycol, 27 parts of modified polysiloxane, 16 parts of sodium lauryl sulfate, 9 parts of dodecyl dimethyl betaine and 29 parts of deionized water;

[0079] The modified acetylene glycol is prepared by modifying acetylene glycol with maleic anhydride, and the modified polysiloxane is prepared by modifying low hydrogen-containing silicone oil with butynediol diethoxy ether.

[0080] The preparation method of modified acetylenic diol comprises the following steps:

[0081] Step 1, weighing 48 parts by weight of acetylenediol, 40 parts by weight of maleic anhydride and 9 parts by weight of anhydrous sodium carbonate for use;

[0082] Step 2, pour the acetylene glycol into a beaker and heat it to 65° C., then pour the maleic anhydride into the beaker to melt, and slowly add anhydrous sodium carbonate, stir evenly and react for 5 hours;

[0083] Step 3, adding an extraction aid to the system in step 2 for extraction, filtering after the extraction, and evaporating the solvent to obtain a yellow solid;

[0084] Step 4: Wash the yellow solid in step 3 with acetone, filter it after washing three times, and add anhydrous ethanol to extract the filtered solid again. After ethanol is evaporated, the modified acetylene glycol is obtained.

[0085] The stirring speed in step 2 is 130 r / min.

[0086] The extraction aid in step 3 is anhydrous ethanol or acetone.

[0087] The preparation method of low hydrogen silicone oil is as follows: 26 parts by weight of high hydrogen silicone oil, 121 parts by weight of octamethylcyclotetrasiloxane and 34 parts by weight of hexamethyldisiloxane are weighed and added into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then 6 parts by weight of concentrated sulfuric acid are added for catalysis, and the mixture is heated to 63°C for reaction for 6 hours; after the reaction is completed, the mixture is cooled to 25°C, and 4% sodium bicarbonate powder is slowly added, and the pH value of the reaction liquid is neutralized to 7 after stirring evenly, and finally, the solid is removed by vacuum filtration, and low boiling substances are removed by rotary evaporation at 80°C for 1 hour, and the obtained colorless and transparent oily liquid is the low hydrogen silicone oil.

[0088] The preparation method of modified polysiloxane comprises the following steps:

[0089] Step a, weighing 58 parts by weight of low-hydrogen silicone oil and 53 parts by weight of butynediol diethoxy ether, adding them into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then adding an appropriate amount of chloroplatinic acid-isopropanol solution thereto and stirring and mixing;

[0090] Step b, introducing nitrogen into the four-necked flask in step a for protection, heating to 130° C. in an oil bath for reaction for 3 h, then cooling to room temperature for discharging;

[0091] Step c: The material discharged from step b is subjected to rotary evaporation at 80° C. for 30 minutes to remove the solvent and low-boiling substances, and the obtained light yellow transparent liquid is the modified polysiloxane.

[0092] The dosage of chloroplatinic acid-isopropanol solution in step a is 100 ppm (based on Pt mass / total mass of reaction solution).

[0093] The stirring speed in step a is 110 r / min and the stirring time is 25 min.

[0094] A method for preparing a wetting agent, the preparation method comprising the following steps:

[0095] S1. Weigh modified acetylene glycol, modified polysiloxane, sodium lauryl sulfate, dodecyl dimethyl betaine and deionized water according to the above weight parts for later use;

[0096] S2, pouring the modified acetylene glycol and the modified polysiloxane into a reaction vessel filled with deionized water, adding sodium lauryl sulfate under stirring at a speed of 500 r / min, continuing to stir evenly for 12 minutes, and adding dodecyl dimethyl betaine during stirring, and continuing to stir for 11 minutes;

[0097] S3. Adjust the stirring speed in S2 to 1100 r / min, stir for 25 min and then perform ultrasonic dispersion to obtain the wetting agent.

[0098] The temperature condition in S2 was 33° C., the frequency of ultrasonic dispersion in S3 was 26 KHz, and the ultrasonic dispersion time was 10 min.

[0099] Performance Testing

[0100] The wetting agents prepared in Examples 1-3 are marked as Example 1, Example 2, and Example 3, and the common wetting agents on the market are marked as comparative examples. Then, the performances of Example 1, Example 2, Example 3, and the comparative example are tested respectively, and the test results are recorded in the following table:

[0101]

[0102] It can be seen from the data in the above table that the wetting agents prepared in Examples 1-3 have lower surface tension and better stability than ordinary wetting agents on the market, and have excellent market promotion value.

[0103] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a wetting agent, characterized in that: The raw materials for preparing the wetting agent include, by weight: 35-38 parts of modified acetylene glycol, 26-28 parts of modified polysiloxane, 15-16 parts of sodium lauryl sulfate, 8-10 parts of dodecyl dimethyl betaine and 28-30 parts of deionized water; The modified acetylene glycol is prepared by modifying acetylene glycol with maleic anhydride, and the modified polysiloxane is prepared by modifying low-hydrogen silicone oil with butynediol diethoxy ether; The preparation method of the wetting agent comprises the following steps: S1. Weigh modified acetylene glycol, modified polysiloxane, sodium lauryl sulfate, dodecyl dimethyl betaine and deionized water according to the above weight parts for later use; S2, pouring the modified acetylene glycol and the modified polysiloxane into a reaction vessel filled with deionized water, adding sodium lauryl sulfate under stirring at a speed of 400-600 r / min, continuing to stir evenly for 10-15 min, and adding dodecyl dimethyl betaine during stirring, and continuing to stir for 10-12 min; S3, adjusting the stirring speed in S2 to 1000-1200 r / min, stirring for 20-30 min and then ultrasonically dispersing, the result is the wetting agent; The temperature condition in S2 is 30-35° C., the frequency of ultrasonic dispersion in S3 is 22-30 KHz, and the ultrasonic dispersion time is 10 min; The preparation method of the modified acetylenic diol comprises the following steps: Step 1, weighing 45-50 parts by weight of acetylenediol, 38-42 parts by weight of maleic anhydride and 8-9 parts by weight of anhydrous sodium carbonate for standby use; Step 2, pour the acetylene glycol into a beaker and heat it to 65°C, then pour the maleic anhydride into the beaker to melt, slowly add anhydrous sodium carbonate, stir evenly and react for 4-5 hours; Step 3, adding an extraction aid to the system in step 2 for extraction, filtering after the extraction, and evaporating the solvent to obtain a yellow solid; Step 4, washing the yellow solid in step 3 with acetone, filtering after washing 3 times, and adding anhydrous ethanol to the filtered solid for re-extraction, and after evaporating the ethanol, the obtained product is the modified acetylene glycol; The preparation method of the modified polysiloxane comprises the following steps: Step a, weighing 55-60 parts by weight of low hydrogen silicone oil and 50-55 parts by weight of butynediol diethoxy ether and adding them into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then adding an appropriate amount of chloroplatinic acid-isopropanol solution thereto and stirring and mixing; Step b, introducing nitrogen into the four-necked flask in step a for protection, heating to 130° C. in an oil bath for reaction for 2-3 hours, then cooling to room temperature for discharging; Step c: The material discharged from step b is subjected to rotary evaporation at 80° C. for 30 minutes to remove the solvent and low-boiling substances, and the obtained light yellow transparent liquid is the modified polysiloxane.

2. The method for preparing a wetting agent according to claim 1, characterized in that: The stirring speed in step 2 is 120-150 r / min.

3. The method for preparing a wetting agent according to claim 1, characterized in that: The extraction aid in step 3 is anhydrous ethanol or acetone.

4. The method for preparing a wetting agent according to claim 1, characterized in that: The preparation method of the low hydrogen silicone oil is as follows: 25-26 parts by weight of high hydrogen silicone oil, 120-122 parts by weight of octamethylcyclotetrasiloxane and 33-35 parts by weight of hexamethyldisiloxane are weighed and added into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and then 5-6 parts by weight of concentrated sulfuric acid are added for catalysis, and the mixture is heated to 60-65° C. for reaction for 6 hours; after the reaction is completed, the mixture is cooled to 25° C., and 3-5 parts of sodium bicarbonate powder are slowly added, and the pH value of the reaction liquid is neutralized to 6-7 after stirring evenly, and finally solids are removed by vacuum filtration, and low boiling substances are removed by rotary evaporation at 80° C. for 1 hour, and the obtained colorless and transparent oily liquid is the low hydrogen silicone oil.

5. The method for preparing a wetting agent according to claim 1, characterized in that: Calculated by Pt mass / total reaction liquid mass, the amount of chloroplatinic acid-isopropanol solution used in step a is 100 ppm.

6. The method for preparing a wetting agent according to claim 1, characterized in that: The stirring speed in step a is 100-110 r / min, and the stirring time is 20-30 min.

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