CN111378214A - Sodium alkyl benzene sulfonate special for nitrile rubber and preparation method thereof - Google Patents
Sodium alkyl benzene sulfonate special for nitrile rubber and preparation method thereof Download PDFInfo
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- CN111378214A CN111378214A CN202010337173.8A CN202010337173A CN111378214A CN 111378214 A CN111378214 A CN 111378214A CN 202010337173 A CN202010337173 A CN 202010337173A CN 111378214 A CN111378214 A CN 111378214A
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- C08K5/42—Sulfonic acids; Derivatives thereof
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Abstract
The invention provides sodium alkyl benzene sulfonate special for nitrile rubber, which is characterized by comprising the following components in part by weight: the sodium alkyl benzene sulfonate is synthesized by the following raw materials of compounds, wherein the raw materials comprise the following components in percentage by mass: 10-12% of dodecyl benzene sulfonic acid, 27-29% of liquid caustic soda, 56-58% of deionized water and 3-5% of sodium dodecyl sulfate, wherein the sum of the mass percentages of the components is 100%. The invention can obviously improve the oil resistance and fatigue resistance of the rubber and obviously reduce the cracking phenomenon caused by aging by using the sodium alkyl benzene sulfonate special for the nitrile rubber.
Description
Technical Field
The invention relates to the field of sodium alkyl benzene sulfonate, in particular to sodium alkyl benzene sulfonate special for nitrile rubber and a preparation method thereof.
Background
An emulsifier is a substance that improves the surface tension between the various constituent phases of an emulsion to form a uniform stable dispersion or emulsion. Emulsifiers are surface-active substances which have both hydrophilic and lipophilic groups in the molecule and which accumulate at the oil/water interface and reduce the interfacial tension and the energy required to form an emulsion, thereby increasing the energy of the emulsion. The sodium dodecyl benzene sulfonate is used as an anionic surfactant, has good surface activity and stronger hydrophilicity, effectively reduces the tension of an oil-water interface, and achieves the emulsification effect. Therefore, the sodium dodecyl benzene sulfonate is widely applied to the preparation of emulsion such as cosmetics, foods, printing and dyeing auxiliaries, pesticides and the like.
Disclosure of Invention
The invention provides sodium alkyl benzene sulfonate special for nitrile rubber and a preparation method thereof, aiming at overcoming the defects in the prior art and overcoming the shortages in the field of oil-resistant rubber in China.
In order to solve the technical problems, the invention adopts the technical scheme that: the sodium alkyl benzene sulfonate special for the nitrile rubber is synthesized by the following raw materials of compounds, wherein the raw materials comprise the following components in percentage by mass: 10-12% of dodecyl benzene sulfonic acid, 27-29% of liquid caustic soda, 56-58% of deionized water and 3-5% of sodium dodecyl sulfate, wherein the sum of the mass percentages of the components is 100%.
Further, the emulsifier is synthesized by the following raw materials of compounds, wherein the raw materials comprise the following components in percentage by mass: 11.11 percent of dodecyl benzene sulfonic acid, 28.28 percent of liquid caustic soda, 56.57 percent of distilled water and 4.04 percent of lauryl sodium sulfate.
Further, the concentration of the liquid caustic soda is 30-32%.
Further, the dodecylbenzene sulfonic acid has a neutralization number of 128.
The preparation method of the sodium alkyl benzene sulfonate special for the nitrile rubber is characterized by comprising the following steps:
s1: metering dodecyl benzene sulfonic acid, liquid caustic soda, deionized water and sodium dodecyl sulfate according to the proportion of ingredients;
s2: adding deionized water into a 1t reaction kettle, adding liquid caustic soda into the reaction kettle, and stirring for 1-3 min to fully mix the liquid caustic soda with water;
s3: slowly adding dodecylbenzene sulfonic acid into a reaction kettle, and controlling the adding time to be 8-10 min and the reaction time to be 25-30 min; after the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline;
s4: adding sodium dodecyl sulfate into an emulsifying kettle, starting an emulsifying pump for emulsifying, controlling the reaction temperature to be 50-60 ℃, and emulsifying for 9-10 min to obtain a finished product sodium alkyl benzene sulfonate.
Further, after the full reaction in the S3, the pH value of the semi-finished product is 7-9.
Further, in the emulsification process in the S4, the pH value of a finished product is 7.3-7.7 under the environment condition of 25 ℃.
Furthermore, the sodium alkyl benzene sulfonate special for the nitrile rubber comprises 29-31% of active matters and 2.5% of free oil in a quantitative ratio; the petroleum ether active matter in the sodium alkyl benzene sulfonate special for the nitrile rubber is not more than 0.8 percent, and the chroma is not more than 15 percent.
Compared with the prior art, the invention has the beneficial effects that: by using the sodium alkyl benzene sulfonate special for the nitrile rubber, the oil resistance and the fatigue resistance of the rubber can be obviously improved, and the cracking phenomenon caused by aging can be obviously reduced.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description is merely illustrative of the technical solutions of the present invention, and should not be construed as being all of the present invention or limiting or restricting the technical solutions of the present invention.
Example 1
Firstly weighing 270kg of dodecylbenzene sulfonic acid, 100kg of liquid caustic soda, an emulsifier K1230 kg and 560kg of deionized water according to the mixture ratio. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 2min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 9 min. After the full reaction, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 7.6 by using pH test paper. After the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline, adding an emulsifier K12 into the emulsifying kettle, starting an emulsifying pump connected with the reaction kettle for emulsification, controlling the reaction temperature to be 55 ℃, obtaining the finished sodium alkyl benzene sulfonate after the emulsification time is 9min, and controlling the pH value to be 7.4 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. The active substance content of the finished product of the sodium dodecyl benzene sulfonate emulsified by the emulsification pump is 29 percent, the content of the soluble substance in the petroleum ether is 0.6 percent, and the chroma is 12.
Example 2
Firstly, 280kg of dodecylbenzene sulfonic acid, 100kg of liquid alkali, K1240 kg emulsifier and 580kg of deionized water are weighed according to the proportion of ingredients. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 2min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 9 min. After the full reaction, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 7.0 by using pH test paper. After the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline, adding an emulsifier K12 into the middle reaction kettle, starting an emulsifying pump connected with the reaction kettle for emulsification, controlling the reaction temperature to be 55 ℃, obtaining the finished sodium alkyl benzene sulfonate after the emulsification time is 9min, and controlling the pH value to be 7.3 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. After emulsification by an emulsification pump, the active substance content of the finished sodium dodecyl benzene sulfonate product is 29.3%, the content of petroleum ether soluble substances in the finished sodium dodecyl benzene sulfonate product is 0.5%, and the chroma is 13.
Example 3
Firstly weighing 290kg of dodecylbenzene sulfonic acid, 100kg of liquid caustic soda, an emulsifier K1250 kg and 570kg of deionized water according to the proportion of ingredients. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 1min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 8 min. After the full reaction, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 8.2 by using pH test paper. After the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline, adding an emulsifier K12 into the middle reaction kettle, starting an emulsifying pump connected with the reaction kettle for emulsification, controlling the reaction temperature to be 50 ℃, obtaining the finished sodium alkyl benzene sulfonate after the emulsification time is 10min, and controlling the pH value to be 7.7 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. After emulsification by an emulsification pump, the active substance content of the finished sodium dodecyl benzene sulfonate product is 30.3%, the content of petroleum ether soluble substances in the finished sodium dodecyl benzene sulfonate product is 0.8%, and the chroma is 14.
Example 4
Firstly, 280kg of dodecylbenzene sulfonic acid, 110kg of liquid alkali, 1240 kg of emulsifier and 560kg of deionized water are weighed according to the proportion of ingredients. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 2min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 9 min. After the full reaction, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 8.0 by using pH test paper. After the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline, adding an emulsifier K12 into the middle reaction kettle, starting an emulsifying pump connected with the reaction kettle for emulsification, controlling the reaction temperature to be 55 ℃, obtaining the finished sodium alkyl benzene sulfonate after the emulsification time is 10min, and controlling the pH value to be 7.5 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. After emulsification by an emulsification pump, the active substance content of the finished sodium dodecyl benzene sulfonate product is 30.4%, the content of petroleum ether soluble substances in the finished sodium dodecyl benzene sulfonate product is 0.4%, and the chroma is 11.
Example 5
Firstly weighing 290kg of dodecylbenzene sulfonic acid, 110kg of liquid caustic soda, an emulsifier K1250 kg and 570kg of deionized water according to the proportion of ingredients. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 3min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 10 min. After the full reaction, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 7.2 by using pH test paper. After the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline, adding an emulsifier K12 into the middle reaction kettle, starting an emulsifying pump connected with the reaction kettle for emulsification, controlling the reaction temperature to be 55 ℃, obtaining the finished sodium alkyl benzene sulfonate after the emulsification time is 10min, and controlling the pH value to be 7.6 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. After emulsification by an emulsification pump, the active substance content of the finished sodium dodecyl benzene sulfonate product is 30.1 percent, the content of petroleum ether soluble substances in the finished sodium dodecyl benzene sulfonate product is 0.7 percent, and the chroma is 15 percent.
Example 6
Firstly weighing 270kg of dodecylbenzene sulfonic acid, 110kg of liquid caustic soda, an emulsifier K1230 kg and 580kg of deionized water according to the proportion of ingredients. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 3min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 10 min. After the full reaction, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 8.6 by using pH test paper. After the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline, adding an emulsifier K12 into the middle reaction kettle, starting an emulsifying pump connected with the reaction kettle for emulsification, controlling the reaction temperature to be 55 ℃, obtaining the finished sodium alkyl benzene sulfonate after the emulsification time is 10min, and controlling the pH value to be 7.3 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. After emulsification by an emulsification pump, the active substance content of the finished sodium dodecyl benzene sulfonate product is 29.6 percent, the content of petroleum ether soluble substances in the finished sodium dodecyl benzene sulfonate product is 0.6 percent, and the chroma is 12.
Example 7
Firstly, 290kg of dodecylbenzene sulfonic acid, 120kg of liquid caustic soda, an emulsifier K1250 kg and 580kg of deionized water are weighed according to the proportion of ingredients. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 3min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 10 min. After the full reaction, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 9.0 by using pH test paper. After the reaction is finished, the semi-finished sodium alkyl benzene sulfonate is sent into an emulsifying kettle through a pipeline, an emulsifying agent K12 is added into the middle reaction kettle, an emulsifying pump connected with the reaction kettle is started for emulsification, the reaction temperature is controlled to be 55 ℃, the emulsification time is 10min, the finished sodium alkyl benzene sulfonate is obtained, and the pH value is 7.6 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. After emulsification by an emulsification pump, the active substance content of the finished sodium dodecyl benzene sulfonate product is 30.3%, the content of petroleum ether soluble substances in the finished sodium dodecyl benzene sulfonate product is 0.5%, and the chroma is 14.
Example 8
Firstly weighing 270kg of dodecylbenzene sulfonic acid, 120kg of liquid alkali, K1240 kg emulsifier and 570kg of deionized water according to the proportion. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 3min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 10 min. After the reaction is fully reflected, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 8.3 by using pH test paper. After the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline, adding an emulsifier K12 into the middle reaction kettle, starting an emulsifying pump connected with the reaction kettle for emulsification, controlling the reaction temperature to be 55 ℃, obtaining the finished sodium alkyl benzene sulfonate after the emulsification time is 10min, and controlling the pH value to be 7.3 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. After emulsification by an emulsification pump, the active substance content of the finished sodium dodecyl benzene sulfonate product is 29.9 percent, the content of petroleum ether soluble substances in the finished sodium dodecyl benzene sulfonate product is 0.8 percent, and the chroma is 13.
Example 9
Firstly, 280kg of dodecylbenzene sulfonic acid, 120kg of liquid alkali, an emulsifier K1250 kg and 560kg of deionized water are weighed according to the proportion of ingredients. Adding deionized water into a 1t reaction kettle, slowly pouring liquid caustic soda along the reaction kettle, and stirring for 3min to fully mix the liquid caustic soda and the deionized water. Slowly adding the dodecylbenzene sulfonic acid into the reaction kettle, and controlling the adding time of the dodecylbenzene sulfonic acid to be 10 min. After the full reaction, the pH value of the semi-finished sodium alkyl benzene sulfonate in the reaction kettle is measured to be 7.9 by using pH test paper. After the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline, adding an emulsifier K12 into the middle reaction kettle, starting an emulsifying pump connected with the reaction kettle for emulsification, controlling the reaction temperature to be 55 ℃, obtaining the finished sodium alkyl benzene sulfonate after the emulsification time is 10min, and controlling the pH value to be 7.4 under the environment condition of 25 ℃. In the emulsification process, a PHS-3C type precision pH meter is adopted to monitor the pH value of the sodium dodecyl benzene sulfonate. After emulsification by an emulsification pump, the active substance content of the finished sodium dodecyl benzene sulfonate product is 30.4%, the content of petroleum ether soluble substances in the finished sodium dodecyl benzene sulfonate product is 0.4%, and the chroma is 15.
According to the content of active matters and the content of petroleum ether soluble matters in the above examples, the content of active matters is 30.4% compared with the active matters in example 4, the finished product in example 4 is milk white flowing paste or paste, the content of active matters is the highest, and the content of petroleum ether and the color degree are the lowest, so the effect of the sodium alkyl benzene sulfonate special for nitrile rubber in example 4 is the best.
The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (8)
1. A sodium alkyl benzene sulfonate special for nitrile rubber is characterized in that: the sodium alkyl benzene sulfonate is synthesized by the following raw materials of compounds, wherein the raw materials comprise the following components in percentage by mass: 10-12% of dodecyl benzene sulfonic acid, 27-29% of liquid caustic soda, 56-58% of deionized water and 3-5% of sodium dodecyl sulfate, wherein the sum of the mass percentages of the components is 100%.
2. The sodium alkylbenzene sulfonate special for nitrile rubber according to claim 1, wherein the sodium alkylbenzene sulfonate special for nitrile rubber is synthesized from the following raw materials, and the raw materials comprise, by mass: 11.11 percent of dodecyl benzene sulfonic acid, 28.28 percent of liquid caustic soda, 56.57 percent of distilled water and 4.04 percent of lauryl sodium sulfate.
3. The sodium alkyl benzene sulfonate special for nitrile rubber according to claim 1, wherein the concentration of the liquid caustic soda is 30-32%.
4. The sodium alkylbenzene sulfonate special for nitrile rubber according to claim 1, wherein the neutralization number of the dodecylbenzene sulfonic acid is 128.
5. The process for preparing sodium alkyl benzene sulfonate specially used for nitrile rubber according to any one of claims 1 to 4, characterized by comprising the following steps:
s1: metering dodecyl benzene sulfonic acid, liquid caustic soda, deionized water and sodium dodecyl sulfate according to the proportion of ingredients;
s2: adding deionized water into a reaction kettle with the volume of 1t, adding liquid caustic soda into the reaction kettle, and stirring for 1-3 min to fully mix the liquid caustic soda and water;
s3: slowly adding dodecylbenzene sulfonic acid into a reaction kettle, and controlling the adding time to be 8-10 min and the reaction time to be 25-30 min; after the reaction is finished, feeding the semi-finished sodium alkyl benzene sulfonate into an emulsifying kettle through a pipeline;
s4: adding sodium dodecyl sulfate into an emulsifying kettle, starting an emulsifying pump for emulsifying, controlling the reaction temperature to be 50-60 ℃, and emulsifying for 9-10 min to obtain a finished product sodium alkyl benzene sulfonate.
6. The preparation method of sodium alkyl benzene sulfonate special for nitrile rubber according to claim 5, wherein after the full reaction in S3, the pH value of the semi-finished product is between 7 and 9.
7. The preparation method of sodium alkyl benzene sulfonate special for nitrile rubber according to claim 5, wherein in the emulsification process in S4, the pH value of the finished product is 7.3-7.7 at 25 ℃.
8. The sodium alkyl benzene sulfonate special for nitrile rubber according to any one of claims 1 to 7, wherein the sodium alkyl benzene sulfonate special for nitrile rubber comprises 29 to 31% of active matters and 2.5% of free oil by number ratio; the petroleum ether active matter in the sodium alkyl benzene sulfonate special for the nitrile rubber is not more than 0.8 percent, and the chroma is not more than 15 percent.
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