CN114644722A - Solvent removal method for chlorosulfonated polyethylene glue solution - Google Patents

Solvent removal method for chlorosulfonated polyethylene glue solution Download PDF

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CN114644722A
CN114644722A CN202210198868.1A CN202210198868A CN114644722A CN 114644722 A CN114644722 A CN 114644722A CN 202210198868 A CN202210198868 A CN 202210198868A CN 114644722 A CN114644722 A CN 114644722A
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chlorosulfonated polyethylene
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CN114644722B (en
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闵欣
占昌朝
严平
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Jiujiang University
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    • 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
    • C08F6/00—Post-polymerisation treatments
    • 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
    • C08F6/00—Post-polymerisation treatments
    • C08F6/06—Treatment of polymer solutions
    • C08F6/10—Removal of volatile materials, e.g. solvents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/32—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing phosphorus or sulfur
    • C08L23/34—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with compounds containing phosphorus or sulfur by chlorosulfonation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/26—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment
    • C08J2323/32—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment by reaction with phosphorus- or sulfur-containing compounds
    • C08J2323/34—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment by reaction with phosphorus- or sulfur-containing compounds by chlorosulfonation

Abstract

A solvent removal method for chlorosulfonated polyethylene glue comprises the following steps: heating water in a water coagulation kettle to 70-100 ℃, adding a dispersing agent, and stirring to form a uniformly dispersed dispersion solution; adding a colloid stabilizer into the dispersion solution of the water condensation kettle, and stirring to form a uniformly dispersed mixed solution; adding chlorosulfonated polyethylene glue solution into the mixed solution of the water condensation kettle at a preset rate, keeping the temperature of the water condensation kettle, and performing water condensation for a preset time to obtain a condensation mixture; and (3) removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product. Under the synergistic action of the dispersing agent and the colloid stabilizer, the particle size of the colloid solution in water is greatly reduced, so that the specific surface area of the colloid solution is rapidly enlarged, the contact area of colloidal particles and water is increased, the heat transfer efficiency is greatly improved, the solvent removal efficiency is finally increased, the solvent residue is greatly reduced, and the environmental protection performance of the product is greatly enhanced.

Description

Solvent removal method for chlorosulfonated polyethylene glue solution
Technical Field
The invention relates to the technical field of chlorosulfonated polyethylene preparation, in particular to a solvent removal method for chlorosulfonated polyethylene glue solution.
Background
The chlorosulfonated polyethylene is a special rubber prepared by chlorinating and chlorosulfonating polyethylene, and its chlorine content is 23% -47% and sulfur content is 1% -2%. The chlorosulfonated polyethylene has good ozone resistance, stable color and luster in sunlight, good colorability, oil resistance, heat resistance, oxidation resistance, weather resistance, corrosion resistance, flame retardance, wear resistance and toughness, so that the chlorosulfonated polyethylene has wide application in the fields of wires and cables, waterproof coiled materials, automobile industry and the like.
The traditional chlorosulfonated polyethylene (CSM) elastomer is produced by a solution method, in which inert gas is introduced into a reaction kettle to exhaust air in the kettle before the reaction starts, then the reactant polyethylene PE is dissolved in a halogenated hydrocarbon solvent to prepare a solution with a suitable concentration, then 0.1% -2% of initiator azobisisobutyronitrile is added into the reaction system, and then chlorine gas and sulfur dioxide are continuously introduced into the reaction system. In the process, if the raw material adopts high-density polyethylene, the PE is usually pre-chlorinated in the actual reaction to ensure that the chlorine content is about 10 to 30 percent, the solubility of the polymer is improved, and the 'jelly' phenomenon possibly occurring in chlorosulfonation is prevented; cooling the reaction system to 60-80 ℃ after the pre-chlorination, and then introducing C1 into the reaction system2And SO2The mixed gas continuously finishes the subsequent reaction until reaching the reaction degree required by the product; if the raw material adopts low density polyethylene, chlorination and chlorosulfonation reaction are simultaneously carried out at 60-80 ℃, after the reaction is finished, inert gas is firstly used for blowing tail gas, and then corresponding post-treatment processes such as solvent removal and the like are carried out, and drying is carried out, thus obtaining the finished product.
The production flow of the solution method is mature, and a large number of patent reports exist, so that the solution method is a main production process for preparing chlorosulfonated polyethylene at present. Its advantages are mature technology, easily controlled product performance and various brands. The main disadvantages are that the solvent in the kettle is difficult to separate from the reaction gas after the reaction is finished, and the residual solvent in the product is difficult to remove, which results in the increase of the production cost. Moreover, various halogenated hydrocarbon solvents (carbon tetrachloride, chloroform, trichloroethane, etc.) are easy to damage atmospheric ozone due to their volatile characteristics. At present, the use of Montreal convention commonly established in various countries is limited.
Therefore, the solvent removal process for synthesizing the CSM in China generally adopts a hydrogel mode, and as the viscosity of the rubber material is rapidly increased along with the advance of the condensation process, the rubber material is rapidly adhered and caked in water, and a large amount of solvent which is not evaporated is wrapped in the rubber block, the separation of the solvent and the rubber material is difficult, the content of the solvent in the final finished rubber product exceeds the standard, and the pollution to the construction environment is caused.
Disclosure of Invention
Based on the above, the invention aims to provide a solvent removal method for chlorosulfonated polyethylene glue, so as to reduce the solvent residue in the product and enhance the environmental protection property of the product.
A solvent removal method for chlorosulfonated polyethylene glue comprises the following steps:
step S10, heating the water in the water coagulation kettle to 70-100 ℃, adding a dispersing agent, and stirring to form a uniformly dispersed dispersion solution;
step S20, adding a colloid stabilizer into the dispersion solution of the water condensation kettle, and stirring to form a uniformly dispersed mixed solution;
step S30, adding chlorosulfonated polyethylene glue solution into the mixed solution of the water condensation kettle at a preset rate, keeping the temperature of the water condensation kettle, and performing water condensation for a preset time to obtain a condensation mixture;
and step S40, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
Further, in step S10, the dispersant is prepared by mixing various surfactants with deionized water.
Further, the surfactant is any one or two of fatty alcohol-polyoxyethylene ether-5, fatty alcohol-polyoxyethylene ether-7, fatty alcohol-polyoxyethylene ether-9, coconut oil fatty acid diethanolamide, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate or sodium dodecyl polyoxyethylene ether sulfate.
Further, in step S11, the colloid stabilizer is prepared by uniformly stirring and mixing a water-soluble polymer and deionized water at a certain temperature.
Further, the water-soluble polymer is any one or two of polyvinyl alcohol, sodium polyacrylate, polyvinylpyrrolidone or polyethylene glycol.
Furthermore, the addition amount of the dispersing agent is 0.1-5% of the total mass of the water in the water coagulation kettle, and the addition amount of the colloid stabilizer is 0.1-5% of the total mass of the water in the water coagulation kettle.
Further, in step S30, the chlorosulfonated polyethylene glue solution contains 8% of rubber and the solvent is chloroform.
Further, in the step S30, the adding speed of the chlorosulfonated polyethylene glue solution is 1t/h-10t/h, and the water condensation time is 5min-30 min.
Compared with the prior art, the invention utilizes the dispersing agent (surfactant) to reduce the interfacial tension of two phases of the solvent and water, and then assists in proper stirring, so that the solution colloidal particle containing rubber macromolecules can be rapidly dispersed into small droplets in water, and simultaneously utilizes the stronger adsorption capacity of the colloid stabilizer to adsorb a large amount of hydrophilic macromolecules on the surface of the dispersed small droplets, so that the steric hindrance between the two droplets is increased, the hydrophilicity of the solvent is further increased, and finally the formed small droplets are stably suspended in the water. Under the synergistic effect of the dispersing agent and the colloid stabilizer, the particle size of the colloid solution in water is greatly reduced, the specific surface area of the colloid solution is rapidly enlarged, the contact area of the colloid particles and the water is increased, the heat transfer efficiency is greatly improved, the solvent removal efficiency is finally increased, the solvent residue is greatly reduced, and the environmental protection performance of the product is greatly enhanced.
Drawings
FIG. 1 is a flow diagram of a solvent removal process for chlorosulfonated polyethylene glue of the present invention;
FIG. 2 is a drawing showing chlorosulfonated polyethylene prepared in example 1 of the present invention1Schematic representation of H-NMR characterization;
FIG. 3 is a schematic representation of chlorosulfonated polyethylene prepared in example 1 of the present invention13Schematic representation of C-NMR characterization.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the method for removing the solvent from the chlorosulfonated polyethylene glue provided by the invention comprises the following steps:
step S10, heating the water in the water coagulation kettle to 70-100 ℃, adding a dispersing agent, and stirring to form a uniformly dispersed dispersion solution;
in the step, the dispersing agent is prepared by uniformly stirring and mixing a plurality of surfactants and deionized water, and the adding amount of the dispersing agent is 0.1-5% of the total mass of water in the water coagulation kettle.
Specifically, the surfactant is any one or two of fatty alcohol-polyoxyethylene ether-5, fatty alcohol-polyoxyethylene ether-7, fatty alcohol-polyoxyethylene ether-9, coconut oil fatty acid diethanolamide, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate or sodium dodecyl polyoxyethylene ether sulfate.
Step S20, adding a colloid stabilizer into the dispersion solution of the water condensation kettle, and stirring to form a uniformly dispersed mixed solution;
in the step, the colloid stabilizer is prepared by uniformly stirring and mixing water-soluble polymers and deionized water at a certain temperature, and the adding amount of the colloid stabilizer is 0.1-5% of the total mass of water in the water coagulation kettle.
Specifically, the water-soluble polymer is any one or two of polyvinyl alcohol, sodium polyacrylate, polyvinylpyrrolidone or polyethylene glycol.
Step S30, adding chlorosulfonated polyethylene glue solution into the mixed solution of the water condensation kettle at a preset rate, keeping the temperature of the water condensation kettle, and performing water condensation for a preset time to obtain a condensation mixture;
in the step, the content of the rubber in the chlorosulfonated polyethylene glue solution is 8%, the solvent is trichloromethane, the adding speed of the chlorosulfonated polyethylene glue solution is 1t/h-10t/h, and the water condensation time is 5min-30 min.
And step S40, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
It should be noted that, the invention utilizes dispersant (surfactant) to reduce the interfacial tension of two phases of solvent and water, and then assists with proper stirring, so that the solution colloidal particle containing rubber macromolecules can be rapidly dispersed into small droplets in water, and at the same time, utilizes the stronger adsorption capacity of colloid stabilizer to adsorb a large amount of hydrophilic macromolecules on the surface of the dispersed small droplets, so that the steric hindrance between the two droplets is increased, and the hydrophilicity of the solvent is further increased, and finally the formed small droplets are stably suspended in water. Under the synergistic effect of the dispersing agent and the colloid stabilizer, the particle size of the colloid solution in water is greatly reduced, the specific surface area of the colloid solution is rapidly enlarged, the contact area of the colloid particles and the water is increased, the heat transfer efficiency is greatly improved, the solvent removal efficiency is finally increased, the solvent residue is greatly reduced, and the environmental protection performance of the product is greatly enhanced.
In conclusion, the solvent removal method for the chlorosulfonated polyethylene glue solution is used.
The following is a description of specific examples:
the raw materials, instruments and reagents used by the invention are all commercial products, and can be purchased from the market.
Example 1
Step one, raising the water problem in the water condensation kettle to 80 ℃, adding a dispersing agent (the adding amount is 0.1 percent of the total mass of the water in the water condensation kettle), stirring and dispersing uniformly, wherein the type of the dispersing agent adopts fatty alcohol-polyoxyethylene ether-5.
And step two, adding a colloid stabilizer (the addition amount is 0.1 percent of the total mass of the water in the water coagulation kettle), stirring and dispersing uniformly, wherein the kind of the colloid stabilizer adopts polyvinyl alcohol.
And step three, adding chlorosulfonated polyethylene glue solution (the glue solution is provided by Jiangxi Rainbow chemical Co., Ltd., wherein the content of CSM rubber is 8%, and the solvent is trichloromethane) into the water condensation kettle at the glue solution adding speed of 1t/h, keeping the temperature of the water condensation kettle, and keeping the water condensation time of 5 min.
And step four, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
The final chlorosulfonated polyethylene obtained in example 1 was examined for mechanical and vulcanization properties and compared with chlorosulfonated polyethylene prepared by an old process, as shown in tables 1 and 2.
TABLE 1 mechanical and vulcanization Property parameters of Chlorosulfonated polyethylene
Figure BDA0003526848620000051
TABLE 2 comparison of the product Properties of chlorosulfonated polyethylene obtained by the New and old Process
Figure BDA0003526848620000052
From the performance data in table 1, in combination with the comparison of the performance with the conventional process in table 2, it can be found that the solvent residue is less, the tensile strength is higher and the elongation at break is larger with the new process, which shows the improvement of the mechanical properties of the product.
Referring to FIG. 2, it can be seen that the characteristic of chloroform as a solvent in this embodiment1H-NMR chemical shifts do not appear, which indicates that no solvent remains in the chlorosulfonated polyethylene product;
referring to FIG. 3, it can be seen that the characteristic of chloroform, which is a solvent, is represented in the present example13The C-NMR chemical shift does not appear, which indicates that no solvent remains in the chlorosulfonated polyethylene product.
Example 2
Step one, raising the water problem in a water condensation polymerization kettle to 100 ℃, adding a dispersing agent (the adding amount is 5 percent of the total mass of water in the water condensation kettle), stirring and dispersing uniformly, wherein the dispersing agent is fatty alcohol-polyoxyethylene ether-5 and fatty alcohol-polyoxyethylene ether-7 (mass ratio is 1; 1).
And step two, adding a colloid stabilizer (the addition amount is 5 percent of the total mass of the water in the water coagulation kettle), stirring and dispersing uniformly, wherein the type of the colloid stabilizer adopts sodium polyacrylate.
And step three, adding chlorosulfonated polyethylene glue solution (the glue solution is provided by Jiangxi Rainbow chemical Co., Ltd., wherein the content of CSM rubber is 8%, and the solvent is trichloromethane) into the water condensation kettle at the glue solution adding speed of 10t/h, keeping the temperature of the water condensation kettle, and keeping the water condensation time of 30 min.
And step four, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
Example 3
Step one, raising the water problem in the water condensation kettle to 90 ℃, adding a dispersing agent (the adding amount is 0.5 percent of the total mass of the water in the water condensation kettle), stirring and dispersing uniformly, wherein the type of the dispersing agent adopts sodium dodecyl sulfate.
And step two, adding a colloid stabilizer (the addition amount is 0.2 percent of the total mass of the water in the water coagulation kettle), stirring and dispersing uniformly, wherein the kind of the colloid stabilizer adopts polyvinylpyrrolidone.
And step three, adding chlorosulfonated polyethylene glue solution (the glue solution is provided by Jiangxi Rainbow chemical Co., Ltd., wherein the content of CSM rubber is 8%, and the solvent is trichloromethane) into the water condensation kettle at the glue solution adding speed of 2t/h, keeping the temperature of the water condensation kettle, and keeping the water condensation time of 10 min.
And step four, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
Example 4
Step one, raising the water problem in the water condensation kettle to 85 ℃, adding a dispersing agent (the adding amount is 0.3 percent of the total mass of the water in the water condensation kettle), stirring and dispersing uniformly, wherein the dispersing agent adopts sodium dodecyl sulfate and fatty alcohol polyoxyethylene ether-9 (the mass ratio is 1; 1.5).
And step two, adding a colloid stabilizer (the addition amount is 0.5 percent of the total mass of the water in the water coagulation kettle), stirring and dispersing uniformly, wherein the kind of the colloid stabilizer adopts polyvinyl alcohol and sodium polyacrylate (the mass ratio is 1: 1.5).
And step three, adding chlorosulfonated polyethylene glue solution (the glue solution is provided by Jiangxi Rainbow chemical Co., Ltd., wherein the content of CSM rubber is 8%, and the solvent is trichloromethane) into the water condensation kettle at the glue solution adding speed of 3t/h, keeping the temperature of the water condensation kettle, and keeping the water condensation time of 15 min.
And step four, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
Example 5
Step one, raising the water problem in the water condensation kettle to 95 ℃, adding a dispersing agent (the adding amount is 2 percent of the total mass of the water in the water condensation kettle), stirring and dispersing uniformly, wherein the dispersing agent adopts sodium dodecyl polyoxyethylene ether sulfate and fatty alcohol polyoxyethylene ether-9 (the mass ratio is 1: 1.5).
And step two, adding a colloid stabilizer (the adding amount is 3 percent of the total mass of the water in the water coagulation kettle), stirring and dispersing uniformly, wherein the kind of the colloid stabilizer adopts polyvinyl alcohol and polyvinylpyrrolidone (the mass ratio is 1: 2).
And step three, adding chlorosulfonated polyethylene glue solution (the glue solution is provided by Jiangxi Rainbow chemical Co., Ltd., wherein the content of CSM rubber is 8%, and the solvent is trichloromethane) into the water condensation kettle at the glue solution adding speed of 5t/h, keeping the temperature of the water condensation kettle, and setting the water condensation time for 20 min.
And step four, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
Example 6
Step one, raising the water problem in the water condensation kettle to 70 ℃, adding a dispersing agent (the adding amount is 4 percent of the total mass of the water in the water condensation kettle), stirring and dispersing uniformly, wherein the dispersing agent is dodecyl polyoxyethylene ether sodium sulfate.
And step two, adding a colloid stabilizer (the addition amount is 2 percent of the total mass of the water in the water coagulation kettle), stirring and dispersing uniformly, wherein the type of the colloid stabilizer is polyethylene glycol.
And step three, adding chlorosulfonated polyethylene glue solution (the glue solution is provided by Jiangxi Rainbow chemical Co., Ltd., wherein the content of CSM rubber is 8%, and the solvent is trichloromethane) into the water condensation kettle at the glue solution adding speed of 8t/h, keeping the temperature of the water condensation kettle, and keeping the water condensation time of 25 min.
And step four, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
The results of corresponding physical and chemical property tests on the products synthesized in the above six examples are shown in table 3. It can be seen that the residual amount of solvent (chloroform) in the product was not detected after the dispersant and the colloidal stabilizer were used, which indicates that the solvent removal efficiency of the set of two auxiliary agents is very high. Moreover, in the aspect of mechanical properties, the tensile strength at break and the elongation at break of the product obtained in any embodiment are superior to those of the conventional process, which shows that the quality of the product can be effectively improved by adopting the new process.
TABLE 3 physicochemical Properties of CSM rubber obtained in six examples
Figure BDA0003526848620000081
In summary, the present invention has the following advantages:
1. the product has lower content of chlorinated hydrocarbon solvent (according to the published literature, "Dingxin Liang. Industrial production research on chlorosulfonated polyethylene by mixed solvent [ D ]. university of east China science, 2014", 310-350 kg of solvent is required to be consumed by synthesizing 1 ton of CSM rubber product by the traditional process, the solvent residue exists in the product and is released and consumed in the using process), because the solvent is recovered, the amount of the solvent remaining in the product is low, namely, the consumption of halogenated hydrocarbon solvent of about 0.3 ton per ton of product can be reduced, and the product has obvious environmental protection effect and social effect.
2. Because the residual solvent in the product is reduced, the total amount of the solvent released to the outside in the product is reduced, the solvent recovery efficiency is indirectly improved, the solvent cost is greatly reduced, and the cost performance of the product is improved.
3. The higher specific surface area not only greatly reduces the particle size of the glue solution in water, but also rapidly enlarges the specific surface area, increases the contact area of the colloidal particles and the water, greatly improves the heat transfer efficiency, and finally increases the solvent removal efficiency, and can also utilize the surface in contact with the water to remove the impurities (such as hydrogen chloride, hypochlorous acid and metal salt) wrapped in the glue solution, and the impurities, especially the metal salt and the hydrogen chloride can cause the sulfonyl chloride structure in the product to be crosslinked, and finally cause the product to be gelled and to be vulcanized too early, so that the mechanical property and the storage stability are reduced. Therefore, the mechanical property and the storage stability of the product can be improved by removing the part of impurity residues.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other. The above embodiments only express several embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (8)

1. A solvent removal method for chlorosulfonated polyethylene glue is characterized by comprising the following steps:
step S10, heating the water in the water coagulation kettle to 70-100 ℃, adding a dispersing agent, and stirring to form a uniformly dispersed dispersion solution;
step S20, adding a colloid stabilizer into the dispersion solution of the water condensation kettle, and stirring to form a uniformly dispersed mixed solution;
step S30, adding chlorosulfonated polyethylene glue solution into the mixed solution of the water condensation kettle at a preset rate, keeping the temperature of the water condensation kettle, and performing water condensation for a preset time to obtain a condensation mixture;
and step S40, removing the solvent from the condensed mixture, and drying to obtain a chlorosulfonated polyethylene finished product.
2. The method for removing the solvent from the chlorosulfonated polyethylene glue according to claim 1, wherein in step S10, the dispersant is prepared by uniformly mixing a plurality of surfactants with deionized water.
3. The solvent removal method for chlorosulfonated polyethylene glue according to claim 2, wherein the surfactant is any one or two of fatty alcohol-polyoxyethylene ether-5, fatty alcohol-polyoxyethylene ether-7, fatty alcohol-polyoxyethylene ether-9, coconut oil fatty acid diethanolamide, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, or sodium dodecyl polyoxyethylene ether sulfate.
4. The method for removing the solvent from the chlorosulfonated polyethylene glue according to claim 1, wherein in step S11, the colloid stabilizer is prepared by uniformly stirring and mixing a water-soluble polymer and deionized water at a certain temperature.
5. The method as claimed in claim 4, wherein the water-soluble polymer is one or two of polyvinyl alcohol, sodium polyacrylate, polyvinylpyrrolidone and polyethylene glycol.
6. The method as claimed in claim 1, wherein the dispersant is added in an amount of 0.1-5% and the colloid stabilizer is added in an amount of 0.1-5% based on the total mass of water in the water coagulation kettle.
7. The method as claimed in claim 1, wherein the chlorosulfonated polyethylene dope contains 8% of rubber and the solvent is chloroform in step S30.
8. The solvent removal method for chlorosulfonated polyethylene dope according to claim 1, wherein in the step S30, the chlorosulfonated polyethylene dope is added at a rate of 1t/h to 10t/h, and the water condensation time is 5min to 30 min.
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