CN111574648A - Synthetic method of sodium polyacrylate - Google Patents
Synthetic method of sodium polyacrylate Download PDFInfo
- Publication number
- CN111574648A CN111574648A CN202010569211.2A CN202010569211A CN111574648A CN 111574648 A CN111574648 A CN 111574648A CN 202010569211 A CN202010569211 A CN 202010569211A CN 111574648 A CN111574648 A CN 111574648A
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- Prior art keywords
- sodium
- sodium polyacrylate
- reaction
- aqueous solution
- synthesizing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/04—Acids; Metal salts or ammonium salts thereof
- C08F120/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/38—Polymerisation using regulators, e.g. chain terminating agents, e.g. telomerisation
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention relates to the technical field of water-based dispersants, and particularly discloses a method for synthesizing sodium polyacrylate, which comprises the following steps: adding a telomerization agent into a sodium acrylate aqueous solution, raising the temperature to a certain temperature, slowly adding an initiator to initiate reaction, finishing the addition, keeping the temperature for a period of time, and dewatering and concentrating after the reaction is finished to obtain a finished product. The invention has the advantages that the prepared sodium polyacrylate solution has the solid content of 30-40 percent, the relative molecular mass of 3000-5000 and the molecular weight distribution of less than 3, and is mainly used as a water-based dispersant.
Description
Technical Field
The invention relates to the technical field of aqueous dispersants, and particularly relates to a synthesis method of sodium polyacrylate.
Background
Sodium polyacrylate is one of the acrylic acid chemical products developed at home and abroad in recent years. The product with the relative molecular mass of 3000-5000-.
The method can fully recycle the industrial wastewater containing sodium acrylate as the main component generated in the production of the acrylic ester, and reduce the output of the wastewater.
After examining a large number of documents, the current methods for synthesizing sodium polyacrylate at home and abroad mainly include solution method, suspension method and emulsion method. The synthetic phase composition mainly adopts a solution method for low molecular weight products with molecular mass of 3000-5000-.
Disclosure of Invention
The invention aims to provide a method for synthesizing sodium polyacrylate, which comprises the steps of adding a telomerization agent into a sodium acrylate aqueous solution, heating to a certain temperature, slowly adding an initiator to initiate reaction, finishing the addition, keeping the temperature, reacting for a period of time, and dewatering and concentrating after the reaction is finished to obtain a finished product.
In order to solve the technical problems, the invention provides a method for synthesizing sodium polyacrylate, which comprises the following steps:
s1, adding a sodium acrylate aqueous solution into a reaction kettle, starting stirring, adding a telomerization agent, uniformly mixing, and heating to 45-50 ℃;
s2, slowly adding an initiator at a constant speed to initiate reaction, wherein the adding speed is within 15-90min, and continuously heating to 50-80 ℃ while adding;
s3, reacting for 1-4h under the condition of heat preservation;
s4, after the reaction is finished, carrying out negative pressure dehydration concentration until the solid content of the product is 30-40%, and controlling the dehydration temperature at 50-80 ℃.
Specifically, the sodium acrylate aqueous solution in S1 in S1 is industrial wastewater containing sodium acrylate, the concentration is 5-30%, the pH value is 7-8, and the mass ratio of the telomerization agent to the sodium acrylate aqueous solution is 0.1-2.5%.
Specifically, the telogen includes one or more of isopropanol, sodium sulfite, sodium bisulfite and the like.
Specifically, the initiator in S2 includes one or more of ammonium persulfate, potassium persulfate, and the like.
The invention has the beneficial effects that: the reaction temperature can be effectively reduced, the reaction is mild, the occurrence of implosion is prevented, the solid content of the prepared sodium polyacrylate solution is 30-40%, the relative molecular mass is 3000-.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a specific embodiment of the invention, a method for synthesizing sodium polyacrylate is specifically disclosed, which comprises the following steps:
s1, adding a sodium acrylate aqueous solution into a reaction kettle, starting stirring, adding a telomerization agent, uniformly mixing, and heating to 45-50 ℃;
s2, slowly adding an initiator at a constant speed to initiate reaction, wherein the adding speed is within 15-90min, and continuously heating to 50-80 ℃ while adding;
s3, reacting for 1-4h under the condition of heat preservation;
s4, after the reaction is finished, carrying out negative pressure dehydration concentration until the solid content of the product is 30-40%, and controlling the dehydration temperature at 50-80 ℃.
Specifically, the sodium acrylate aqueous solution in S1 in S1 is industrial wastewater containing sodium acrylate, the concentration is 5-30%, the pH value is 7-8, the mass ratio of a telomerization agent to the sodium acrylate aqueous solution is 0.1-2.5%, and the telomerization agent comprises one or more of isopropanol, sodium sulfite, sodium bisulfite and the like.
Specifically, the initiator in S2 includes one or more of ammonium persulfate, potassium persulfate, and the like.
The prepared sodium polyacrylate solution has a solid content of 30-40%, a relative molecular mass of 3000-.
Example 1:
adding 2000g of 25% sodium acrylate aqueous solution and 20g of sodium sulfite into a reaction kettle in sequence, stirring and heating to 50 ℃, slowly adding 5% ammonium persulfate aqueous solution at a constant speed, finishing the addition in 15min, raising the reaction temperature to 65-70 ℃, and carrying out heat preservation reaction for 3 h. After the reaction is finished, vacuum dehydration is carried out until the solid content of the product is 35 percent, and the dehydration temperature is 60 ℃. The relative molecular mass of the prepared sodium polyacrylate solution is 4900, and the molecular weight distribution is 2.5.
Example 2:
2000g of sodium acrylate aqueous solution with the concentration of 20 percent and 20g of sodium sulfite are sequentially added into a reaction kettle, stirred and heated to 50 ℃, ammonium persulfate aqueous solution with the concentration of 5 percent is slowly added at a constant speed, the addition is finished within 15min, the reaction temperature is raised to 60-65 ℃, and the heat preservation reaction is carried out for 2.5 h. After the reaction is finished, vacuum dehydration is carried out until the solid content of the product is 35 percent, and the dehydration temperature is 60 ℃. The relative molecular weight of the prepared sodium polyacrylate solution is 4200, and the molecular weight distribution is 2.4.
Example 3:
adding 2000g of 15% sodium acrylate aqueous solution and 20g of sodium sulfite into a reaction kettle in sequence, stirring and heating to 50 ℃, slowly adding 5% ammonium persulfate aqueous solution at a constant speed, finishing the addition in 15min, raising the reaction temperature to 55-60 ℃, and carrying out heat preservation reaction for 2 h. After the reaction is finished, vacuum dehydration is carried out until the solid content of the product is 35 percent, and the dehydration temperature is 60 ℃. The prepared sodium polyacrylate solution has a relative molecular mass of 3100 and a molecular weight distribution of 1.6.
The invention has the beneficial effects that: can effectively reduce the reaction temperature, has mild reaction and prevents implosion. The prepared sodium polyacrylate solution has a solid content of 30-40%, a relative molecular mass of 3000-.
The above disclosure is only one preferred embodiment of the present invention, and certainly should not be construed as limiting the scope of the invention, which is defined by the claims and their equivalents.
Claims (4)
1. The method for synthesizing the sodium polyacrylate is characterized by comprising the following steps of:
s1, adding a sodium acrylate aqueous solution into a reaction kettle, starting stirring, adding a telomerization agent, uniformly mixing, and heating to 45-50 ℃;
s2, slowly adding an initiator at a constant speed to initiate reaction, wherein the adding speed is within 15-90min, and continuously heating to 50-80 ℃ while adding;
s3, reacting for 1-4h under the condition of heat preservation;
and S4, after the reaction is finished, carrying out negative pressure dehydration and concentration until the solid content of the product is 30-40%, and controlling the dehydration temperature at 50-80 ℃ to obtain the finished product of the sodium polyacrylate.
2. The method for synthesizing sodium polyacrylate according to claim 1, wherein the aqueous solution of sodium acrylate in S1 is industrial wastewater containing sodium acrylate, the concentration is 5-30%, the pH value is 7-8, and the mass ratio of the telomerization agent to the aqueous solution of sodium acrylate is 0.1-2.5%.
3. The method for synthesizing sodium polyacrylate according to claim 2, wherein the telogen comprises one or more of isopropanol, sodium sulfite and sodium bisulfite.
4. The method for synthesizing sodium polyacrylate according to claim 1, wherein the initiator in S2 comprises one or more of ammonium persulfate and potassium persulfate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010569211.2A CN111574648A (en) | 2020-06-20 | 2020-06-20 | Synthetic method of sodium polyacrylate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010569211.2A CN111574648A (en) | 2020-06-20 | 2020-06-20 | Synthetic method of sodium polyacrylate |
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| Publication Number | Publication Date |
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| CN111574648A true CN111574648A (en) | 2020-08-25 |
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| CN202010569211.2A Pending CN111574648A (en) | 2020-06-20 | 2020-06-20 | Synthetic method of sodium polyacrylate |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102863573A (en) * | 2012-10-23 | 2013-01-09 | 四川花语精细化工有限公司 | Preparation method of sodium polyacrylate aqueous solution with high solid content and narrow molecular weight distribution |
| CN105924566A (en) * | 2016-06-21 | 2016-09-07 | 太仓市东明化工有限公司 | Preparation method of high-molecular sodium polyacrylate for water-absorbent resin |
| CN107473456A (en) * | 2017-10-09 | 2017-12-15 | 江苏开磷瑞阳化工股份有限公司 | A kind of integrated conduct method of acrylate industrial wastewater |
-
2020
- 2020-06-20 CN CN202010569211.2A patent/CN111574648A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102863573A (en) * | 2012-10-23 | 2013-01-09 | 四川花语精细化工有限公司 | Preparation method of sodium polyacrylate aqueous solution with high solid content and narrow molecular weight distribution |
| CN105924566A (en) * | 2016-06-21 | 2016-09-07 | 太仓市东明化工有限公司 | Preparation method of high-molecular sodium polyacrylate for water-absorbent resin |
| CN107473456A (en) * | 2017-10-09 | 2017-12-15 | 江苏开磷瑞阳化工股份有限公司 | A kind of integrated conduct method of acrylate industrial wastewater |
Non-Patent Citations (1)
| Title |
|---|
| 陈磊 等: ""利用两种链转移剂合成低分子量聚丙烯酸钠的对比研究"", 《西南民族大学学报（自然科学版）》 * |
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Application publication date: 20200825 |
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