CN112552459A - Chloroprene rubber latex with core-shell structure colloidal particles and preparation method thereof - Google Patents
Chloroprene rubber latex with core-shell structure colloidal particles and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of chloroprene rubber polymerization, chloroprene and styrene have large physical properties, copolymerization is difficult under general conditions, particularly rubber obtained by copolymerization of two monomers is difficult to realize under industrial conditions, and the development of rubber products is restricted by objective factors. The polymerization of chloroprene monomers and styrene in different time periods is realized, the chloroprene latex with core-shell structure colloidal particles is formed, the combination of two high polymers of polychloroprene and polystyrene in a nano-level microstructure is realized, and the chloroprene rubber latex has potential use value.
Description
Technical Field
The invention belongs to the technical field of chloroprene rubber polymerization, and particularly relates to chloroprene rubber latex with core-shell structure colloidal particles and a preparation method thereof.
Background
The neoprene latex is widely applied to dipping products, coatings, paper treatment, adhesives, cement asphalt modification and the like. The neoprene latex dry glue film has the similar softness, tensile strength, stress at definite elongation and elongation at break as natural latex, has good ozone aging resistance, chemical medicine resistance and small air permeability, and is particularly suitable for manufacturing meteorological balloons, industrial gloves, household gloves, textile glue coating and the like.
Polychloroprene latexes can be classified into general types and special types. The universal neoprene latex has large application amount, is generally a homopolymer and has a simpler structure; the special neoprene latex has gel type and sol type, and includes neoprene latex modified by copolymerization with styrene, acrylonitrile, methacrylic acid and the like. The cross-linked latex has high gel content and high Mooney viscosity, and the non-cross-linked sol-gel latex has low Mooney viscosity.
The physical and chemical properties of different monomers are different and are greatly different, so that the copolymerization reaction among the monomers is greatly limited, which is one of the main reasons for restricting the wide-range use of special neoprene latex. At present, it has been found through studies that the amount of compounds or monomers which can be copolymerized well with chloroprene is limited and requires specific conditions for the reaction.
At present, due to the large production difficulty and complex process, the special chloroprene rubber adhesive on the market is basically from foreign related manufacturers, and domestic manufacturers rarely participate in the field. Researchers in related fields research that emulsion copolymerization of perchlorobutadiene and styrene is carried out under harsh laboratory conditions, but the industrial production process has many restrictive factors which cause difficulty in realization.
Disclosure of Invention
The invention provides neoprene latex with core-shell structure colloidal particles and a preparation method thereof, aiming at solving the problems that chloroprene and styrene have larger physical property difference at present, are difficult to copolymerize under general conditions, particularly rubber obtained by copolymerizing two monomers under industrial conditions is difficult to realize, and the objective reasons restrict the development of the rubber products. Meanwhile, the invention adopts a simpler polymerization process, is simple to operate and is easy to realize industrial production.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a chloroprene monomer is prepared into emulsion for polymerization, when the specific gravity of reaction liquid reaches 1.097-1.11, styrene emulsion is added into the system, the temperature is raised to 78-80 ℃, then polymerization reaction is continued, and the chloroprene latex with the core-shell structure colloidal particles can be obtained after the reaction is finished.
The method comprises the following specific steps:
(1) preparation of oil phase: under the protection of nitrogen, adding 0.1-0.2 part by weight of n-dodecyl mercaptan and 4.0-5.0 parts by weight of disproportionated rosin into 100 parts by weight of 2-chloro-1, 3-butadiene monomer, stirring, and fully dissolving solid substances to prepare an oil phase;
(2) preparation of the aqueous phase: adding 0.9-1.1 parts by weight of potassium hydroxide and 0.7-1.0 part by weight of beta-naphthalenesulfonic acid formaldehyde condensation sodium salt into 110 parts by weight of soft water, stirring, and fully dissolving solid substances to prepare a water phase;
(3) preparation of styrene emulsion: adding 0.5-2 parts by weight of sodium dodecyl benzene sulfonate into 10-50 parts by weight of soft water, dissolving, then adding 5-30 parts by weight of styrene monomer, and stirring to form an emulsion;
(4) preparation of polychloroprene latex: mixing the prepared oil phase and the water phase, emulsifying at 38-40 ℃, and stirring to form a stable emulsion system; adjusting the temperature of the system to 35-45 ℃, and carrying out emulsion polymerization by adopting a method of continuously adding an initiator, wherein the adding speed range of the initiator is 0.05 ml/min-0.2 ml/min, and the emulsion polymerization is stopped until the specific gravity of the emulsion reaches the range of 1.097-1.11;
(5) obtaining the neoprene latex with the core-shell structure colloidal particles: when the specific gravity of the reaction liquid reaches 1.097-1.11, rapidly removing the residual chloroprene by adopting a degassing method; adding the styrene emulsion prepared in the step (3), wherein the mass ratio of the styrene in the emulsion to the chloroprene added before is 0.5-4%; heating to 78-80 ℃, continuously adding the initiator, wherein the adding speed range of the initiator is 0.1-0.3 ml/min, reacting for 1.5-3.5 h at 78-80 ℃, and stopping the reaction.
The initiator is potassium persulfate solution with the mass concentration of 4%.
And (5) after the reaction in the step (5) is finished, adding a stabilizer to stop the reaction, wherein the stabilizer is: 1 part by weight of toluene, 0.02 part by weight of phenothiazine, 0.8 part by weight of antioxidant 264, 1 part by weight of soft water and 1 part by weight of disproportionated rosin potassium soap.
In the step (4), the temperature of the system is adjusted to 40 +/-0.5 ℃.
According to the invention, by changing the reaction temperature and adding the styrene emulsion, two monomers with larger difference in physical and chemical properties are polymerized in different time periods to form the chloroprene latex with the core-shell structure, the process conditions are simple, the operation is easy, and the chloroprene latex with the improved service performance to a great extent is obtained.
Forming core-shell structure colloidal particles in the emulsion: the styrene monomer emulsion prepared in advance is added into a chloroprene rubber latex system, chloroprene monomers in the system are in a starvation state at the moment, but the chloroprene rubber latex system still has larger reaction activity, the reaction can be continuously carried out under the condition that the condition is proper after the styrene rubber emulsion is added, and the proportion of the number of rubber particles is far more than that of monomer liquid drops of styrene, so that the condition is provided for forming core-shell structure rubber particles.
The styrene is added into the chloroprene reaction system in the previous stage in an emulsion state, so that the original system is greatly protected and is not damaged. The emulsifier used for preparing the emulsion by chloroprene is rosin soap, and the emulsifier used for preparing the styrene emulsion is sodium dodecyl benzene sulfonate.
The chloroprene monomer and the styrene monomer have large difference in chemical property and physical property, so that the chloroprene monomer and the styrene monomer are difficult to copolymerize under common conditions, particularly rubber obtained by copolymerizing two monomers under industrial conditions is difficult to realize, and the development of the rubber products is restricted by objective reasons.
Although the chloroprene latex with the core-shell structure colloidal particles prepared by the invention does not change the structure of the polychloroprene in the molecular field to a greater extent, the morphology of the colloidal particles is improved on the basis of a nano-grade physical structure, and the polychloroprene between the core shells and the polystyrene have chemical bonds in the polymerization process, so that the polychloroprene and the polystyrene have chemical bonds to a certain extent and are connected, and the two high polymers are uniformly mixed at a nano-grade, so that the use characteristics of the polychloroprene are changed to a greater extent. There is also a change in the molecular structure of the neoprene. The prepared neoprene latex with the core-shell structure colloidal particles has better film forming performance, and the latex with the morphological structure is easier to realize industrialization and has larger development space. Researches show that the adhesive film prepared from the latex has better low-temperature resistance compared with adhesive films prepared from other emulsions, and the using region and range of the neoprene latex are greatly expanded.
According to the invention, through changing factors such as time, temperature and the like, polymerization of chloroprene monomers and styrene in different time periods is realized, the chloroprene latex with core-shell structure colloidal particles is formed, the combination of two high polymers of polychloroprene and polystyrene in a nano-level microstructure is realized, and the chloroprene rubber latex has potential use value.
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FIG. 1 is a transmission electron microscope image of the polychloroprene latex prepared according to the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are not intended to limit the scope of the invention. In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but 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.
Example 1: a preparation method of neoprene latex with core-shell structure colloidal particles comprises the following steps: under the protection of nitrogen, 1000g of chloroprene monomer, 42g of disproportionated rosin and 1.5g of n-dodecyl mercaptan are added into a reaction kettle. While stirring rapidly, an aqueous phase containing 1100g of soft water, 10.0g of potassium hydroxide and 8.0g of the beta-naphthalenesulfonic acid formalin condensed sodium salt was added. After emulsification is finished at the temperature of 38-40 ℃, adjusting the temperature of the system to the reaction temperature of 40 +/-0.5 ℃, using a potassium persulfate solution with the mass concentration of 4% as an initiator to initiate polymerization, removing chloroprene which does not participate in the reaction and remains in the system when the specific gravity reaches 1.097-1.110, and then adding a prepared emulsion which contains 10g of soft water, 0.5 g of sodium dodecyl benzene sulfonate and 5g of styrene monomer. Rapidly heating to 78-80 ℃, continuously adding the initiator under the protection of nitrogen, maintaining the temperature for 1.5h, and then stopping the reaction. A stabilizer comprising 10g of toluene, 0.2g of phenothiazine, 8g of antioxidant 264, 10g of soft water, 10g of disproportionated rosin potassium soap was added.
And (3) emulsion detection: surface tension 36, pH 12, freeze-thaw temperature-10 ℃.
And (3) detecting the performance of the latex: the emulsion has good mechanical stability, no generation of gel and precipitate after being placed for 24 hours at 70 ℃, and the pH value is 11 after being placed for 72 hours at 70 ℃.
And (3) detecting the properties of the adhesive film: the emulsion has good film forming property, can form a uniform and compact adhesive film, the glass transition temperature obtained by a low-temperature resistance test is-39.6 ℃, and the strength of a raw adhesive film is 8.0 MPa.
FIG. 1 is a transmission electron microscope image of the polychloroprene latex prepared by the method of the present invention. A sample is selected to be diluted by deionized water, dipped and coated on a copper mesh and dried at room temperature, the shape of particles is observed by a transmission electron microscope, and the outermost layer of the colloidal particles has a structure which is obviously different from the inner part of the colloidal particles and is integrally displayed as a spherical core-shell structure as can be seen from the observation of an electron microscope picture.
Example 2: a preparation method of neoprene latex with core-shell structure colloidal particles comprises the following steps: under the protection of nitrogen, 1000g of chloroprene monomer, 42g of disproportionated rosin and 1.5g of n-dodecyl mercaptan are added into a reaction kettle. While stirring rapidly, an aqueous phase containing 1100g of soft water, 10.0g of potassium hydroxide and 8.0g of the beta-naphthalenesulfonic acid formalin condensed sodium salt was added. After emulsification is finished at the temperature of 38-40 ℃, adjusting the temperature of the system to the reaction temperature of 40 +/-0.5 ℃, using a potassium persulfate solution with the mass concentration of 4% as an initiator to initiate polymerization, removing chloroprene which does not participate in the reaction and remains in the system when the specific gravity reaches 1.097-1.110, and then adding a prepared emulsion which contains 10g of soft water, 0.6 g of sodium dodecyl benzene sulfonate and 8g of styrene monomer. Rapidly heating to 78-80 ℃, continuously adding the initiator under the protection of nitrogen, maintaining the temperature for 1.7h, and then stopping the reaction. A stabilizer comprising 10g of toluene, 0.2g of phenothiazine, 8g of antioxidant 264, 10g of soft water, 10g of disproportionated rosin potassium soap was added.
And (3) emulsion detection: surface tension 38, pH 12, freeze-thaw temperature-10 ℃.
And (3) detecting the performance of the latex: the emulsion has good mechanical stability, no generation of gel and precipitate after being placed for 24 hours at 70 ℃, and the pH value is 11 after being placed for 72 hours at 70 ℃.
And (3) detecting the properties of the adhesive film: the emulsion has good film forming property, can form a uniform and compact adhesive film, the glass transition temperature obtained by a low-temperature resistance test is-39.6 ℃, and the strength of a raw adhesive film is 8.0 MPa.
Example 3: a preparation method of neoprene latex with core-shell structure colloidal particles comprises the following steps: under the protection of nitrogen, 1000g of chloroprene monomer, 42g of disproportionated rosin and 1.5g of n-dodecyl mercaptan are added into a reaction kettle. While stirring rapidly, an aqueous phase containing 1100g of soft water, 10.0g of potassium hydroxide and 8.0g of the beta-naphthalenesulfonic acid formalin condensed sodium salt was added. After emulsification is finished at the temperature of 38-40 ℃, adjusting the temperature of the system to the reaction temperature of 40 +/-0.5 ℃, using a potassium persulfate solution with the mass concentration of 4% as an initiator to initiate polymerization, removing chloroprene which does not participate in the reaction and remains in the system when the specific gravity reaches 1.097-1.110, and then adding a prepared emulsion which contains 13 g of soft water, 0.7 g of sodium dodecyl benzene sulfonate and 11g of styrene monomer. Rapidly heating to 78-80 ℃, continuously adding the initiator under the protection of nitrogen, maintaining the temperature for 2.0h, and then stopping the reaction. A stabilizer comprising 10g of toluene, 0.2g of phenothiazine, 8g of antioxidant 264, 10g of soft water, 10g of disproportionated rosin potassium soap was added.
And (3) emulsion detection: surface tension 37, pH 12, freeze-thaw temperature-10 ℃.
And (3) detecting the performance of the latex: the emulsion has good mechanical stability, no generation of gel and precipitate after being placed for 24 hours at 70 ℃, and the pH value is 11 after being placed for 72 hours at 70 ℃.
And (3) detecting the properties of the adhesive film: the emulsion has good film forming property, can form a uniform and compact adhesive film, the glass transition temperature obtained by a low-temperature resistance test is-40.1 ℃, and the strength of a raw adhesive film is 7.3 MPa.
Example 4: a preparation method of neoprene latex with core-shell structure colloidal particles comprises the following steps: under the protection of nitrogen, 1000g of chloroprene monomer, 42g of disproportionated rosin and 1.5g of n-dodecyl mercaptan are added into a reaction kettle. While stirring rapidly, an aqueous phase containing 1100g of soft water, 10.0g of potassium hydroxide and 8.0g of the beta-naphthalenesulfonic acid formalin condensed sodium salt was added. After emulsification is finished at the temperature of 38-40 ℃, adjusting the temperature of the system to the reaction temperature of 40 +/-0.5 ℃, using a potassium persulfate solution with the mass concentration of 4% as an initiator to initiate polymerization, removing chloroprene which does not participate in the reaction and remains in the system when the specific gravity reaches 1.097-1.110, and then adding a prepared emulsion which contains 19 g of soft water, 0.8 g of sodium dodecyl benzene sulfonate and 18g of styrene monomer. Rapidly heating to 78-80 ℃, continuously adding the initiator under the protection of nitrogen, maintaining the temperature for 2.5h, and then stopping the reaction. A stabilizer comprising 10g of toluene, 0.2g of phenothiazine, 8g of antioxidant 264, 10g of soft water, 10g of disproportionated rosin potassium soap was added.
And (3) emulsion detection: surface tension 39, pH 12, freeze-thaw temperature-11 ℃.
And (3) detecting the performance of the latex: the emulsion has good mechanical stability, no generation of gel and precipitate after being placed for 24 hours at 70 ℃, and the pH value is 11 after being placed for 72 hours at 70 ℃.
And (3) detecting the properties of the adhesive film: the emulsion has good film forming property, can form a uniform and compact adhesive film, the glass transition temperature obtained by a low-temperature resistance test is-40.9 ℃, and the strength of a raw adhesive film is 7.7 MPa.
Example 5: a preparation method of neoprene latex with core-shell structure colloidal particles comprises the following steps: under the protection of nitrogen, 1000g of chloroprene monomer, 42g of disproportionated rosin and 1.5g of n-dodecyl mercaptan are added into a reaction kettle. While stirring rapidly, an aqueous phase containing 1100g of soft water, 10.0g of potassium hydroxide and 8.0g of the beta-naphthalenesulfonic acid formalin condensed sodium salt was added. After emulsification is finished at the temperature of 38-40 ℃, adjusting the temperature of the system to the reaction temperature of 40 +/-0.5 ℃, using a potassium persulfate solution with the mass concentration of 4% as an initiator to initiate polymerization, removing chloroprene which does not participate in the reaction and remains in the system when the specific gravity reaches 1.097-1.110, and then adding a prepared emulsion which contains 25g of soft water, 0.9 g of sodium dodecyl benzene sulfonate and 25g of styrene monomer. Rapidly heating to 78-80 ℃, continuously adding the initiator under the protection of nitrogen, maintaining the temperature for 3.0h, and then stopping the reaction. A stabilizer comprising 10g of toluene, 0.2g of phenothiazine, 8g of antioxidant 264, 10g of soft water, 10g of disproportionated rosin potassium soap was added.
And (3) emulsion detection: surface tension 38, pH 12, freeze-thaw temperature-11 ℃.
And (3) detecting the performance of the latex: the emulsion has good mechanical stability, no generation of gel and precipitate after being placed for 24 hours at 70 ℃, and the pH value is 11 after being placed for 72 hours at 70 ℃.
And (3) detecting the properties of the adhesive film: the emulsion has good film forming property, can form a uniform and compact adhesive film, the glass transition temperature obtained by a low-temperature resistance test is-41.1 ℃, and the strength of a raw adhesive film is 7.6 MPa.
Example 6: a preparation method of neoprene latex with core-shell structure colloidal particles comprises the following steps: under the protection of nitrogen, 1000g of chloroprene monomer, 42g of disproportionated rosin and 1.5g of n-dodecyl mercaptan are added into a reaction kettle. While stirring rapidly, an aqueous phase containing 1100g of soft water, 10.0g of potassium hydroxide and 8.0g of the beta-naphthalenesulfonic acid formalin condensed sodium salt was added. After emulsification is finished at the temperature of 38-40 ℃, adjusting the temperature of the system to the reaction temperature of 40 +/-0.5 ℃, using a potassium persulfate solution with the mass concentration of 4% as an initiator to initiate polymerization, removing chloroprene which does not participate in the reaction and remains in the system when the specific gravity reaches 1.097-1.110, and then adding a prepared emulsion which contains 30g of soft water, 1.1g of sodium dodecyl benzene sulfonate and 30g of styrene monomer. Rapidly heating to 78-80 ℃, continuously adding the initiator under the protection of nitrogen, maintaining the temperature for 3.5h, and then stopping the reaction. A stabilizer comprising 10g of toluene, 0.2g of phenothiazine, 8g of antioxidant 264, 10g of soft water, 10g of disproportionated rosin potassium soap was added.
And (3) emulsion detection: surface tension 37, pH 12, freeze-thaw temperature-11 ℃.
And (3) detecting the performance of the latex: the emulsion has good mechanical stability, no generation of gel and precipitate after being placed for 24 hours at 70 ℃, and the pH value is 11 after being placed for 72 hours at 70 ℃.
And (3) detecting the properties of the adhesive film: the emulsion has good film forming property, can form a uniform and compact adhesive film, the glass transition temperature obtained by a low-temperature resistance test is-41.9 ℃, and the strength of a raw adhesive film is 7.9 MPa.
The following table 1 is a table of main materials and performance test data of the neoprene latex with core-shell structure colloidal particles.
TABLE 1 detection table for main materials and performance of neoprene latex with core-shell structure colloidal particles
Note: the length, width and thickness of the raw film are respectively 120 multiplied by 6 multiplied by 0.4mm
The neoprene latex emulsion is prepared according to the comparison example of the neoprene latex method for preparing the core-shell structure colloidal particles, and the detection table of the main materials and the performance is shown in the following table 2:
TABLE 2 comparative examples table
As can be seen from the data in tables 1 and 2, the prepared neoprene latex with core-shell structure colloidal particles has better low temperature resistance, and has better cold resistance compared with the glue films prepared from other common neoprene rubbers. However, the addition amount of the styrene in the whole reaction process is not easy to be too much, the stability of the emulsion is reduced after the addition amount exceeds a certain proportion, and experiments show that the mechanical stability of the emulsion is reduced when the mass ratio of the styrene to the chloroprene exceeds 3.3%.
Example 7: a preparation method of neoprene latex with core-shell structure colloidal particles comprises the following steps: under the protection of nitrogen, 1000g of chloroprene monomer, 40g of disproportionated rosin and 1.0g of n-dodecyl mercaptan are added into a reaction kettle. While stirring rapidly, an aqueous phase containing 1100g of soft water, 9.0g of potassium hydroxide and 7.0g of the beta-naphthalenesulfonic acid formaldehyde condensed sodium salt was added. After emulsification is finished at the temperature of 38-40 ℃, adjusting the temperature of the system to the reaction temperature of 40 +/-0.5 ℃, using a potassium persulfate solution with the mass concentration of 4% as an initiator to initiate polymerization, removing chloroprene which does not participate in the reaction and remains in the system when the specific gravity reaches 1.097-1.110, and then adding an emulsion which is prepared in advance and contains 50g of soft water, 2.0g of sodium dodecyl benzene sulfonate and 30g of styrene monomer. Rapidly heating to 78-80 ℃, continuously adding the initiator under the protection of nitrogen, maintaining the temperature for 3.5h, and then stopping the reaction. A stabilizer comprising 10g of toluene, 0.2g of phenothiazine, 8g of antioxidant 264, 10g of soft water, 10g of disproportionated rosin potassium soap was added.
Example 8: a preparation method of neoprene latex with core-shell structure colloidal particles comprises the following steps: under the protection of nitrogen, 1000g of chloroprene monomer, 50g of disproportionated rosin and 2.0g of n-dodecyl mercaptan are added into a reaction kettle. While stirring rapidly, an aqueous phase containing 1100g of soft water, 11.0g of potassium hydroxide and 10.0g of the beta-naphthalenesulfonic acid formalin condensed sodium salt was added. After emulsification is finished at the temperature of 38-40 ℃, adjusting the temperature of the system to the reaction temperature of 40 +/-0.5 ℃, using a potassium persulfate solution with the mass concentration of 4% as an initiator to initiate polymerization, removing chloroprene which does not participate in the reaction and remains in the system when the specific gravity reaches 1.097-1.110, and then adding an emulsion which is prepared in advance and contains 50g of soft water, 2.0g of sodium dodecyl benzene sulfonate and 30g of styrene monomer. Rapidly heating to 78-80 ℃, continuously adding the initiator under the protection of nitrogen, maintaining the temperature for 3.5h, and then stopping the reaction. A stabilizer comprising 10g of toluene, 0.2g of phenothiazine, 8g of antioxidant 264, 10g of soft water, 10g of disproportionated rosin potassium soap was added.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A preparation method of neoprene latex with core-shell structure colloidal particles is characterized in that: and (2) preparing a chloroprene monomer into emulsion for polymerization, adding styrene emulsion into the system when the specific gravity of the reaction liquid reaches 1.097-1.11, heating to 78-80 ℃, continuing to perform polymerization reaction, and obtaining the chloroprene latex with the core-shell structure colloidal particles after the reaction is finished.
2. The method for preparing neoprene latex with core-shell structure rubber particles as claimed in claim 1, wherein the neoprene latex is prepared by the following steps: the method comprises the following specific steps:
(1) preparation of oil phase: under the protection of nitrogen, adding 0.1-0.2 part by weight of n-dodecyl mercaptan and 4.0-5.0 parts by weight of disproportionated rosin into 100 parts by weight of 2-chloro-1, 3-butadiene monomer, stirring, and fully dissolving solid substances to prepare an oil phase;
(2) preparation of the aqueous phase: adding 0.9-1.1 parts by weight of potassium hydroxide and 0.7-1.0 part by weight of beta-naphthalenesulfonic acid formaldehyde condensation sodium salt into 110 parts by weight of soft water, stirring, and fully dissolving solid substances to prepare a water phase;
(3) preparation of styrene emulsion: adding 0.5-2 parts by weight of sodium dodecyl benzene sulfonate into 10-50 parts by weight of soft water, dissolving, then adding 5-30 parts by weight of styrene monomer, and stirring to form an emulsion;
(4) preparation of polychloroprene latex: mixing the prepared oil phase and the water phase, emulsifying at 38-40 ℃, and stirring to form a stable emulsion system; adjusting the temperature of the system to 35-45 ℃, and carrying out emulsion polymerization by adopting a method of continuously adding an initiator, wherein the adding speed range of the initiator is 0.05 ml/min-0.2 ml/min, and the emulsion polymerization is stopped until the specific gravity of the emulsion reaches the range of 1.097-1.11;
(5) obtaining the neoprene latex with the core-shell structure colloidal particles: when the specific gravity of the reaction liquid reaches 1.097-1.11, rapidly removing the residual chloroprene by adopting a degassing method; adding the styrene emulsion prepared in the step (3), wherein the mass ratio of the styrene in the emulsion to the chloroprene added before is 0.5-4%; heating to 78-80 ℃, continuously adding the initiator, wherein the adding speed range of the initiator is 0.1-0.3 ml/min, reacting for 1.5-3.5 h at 78-80 ℃, and stopping the reaction.
3. The method for preparing neoprene latex with core-shell structure rubber particles as claimed in claim 2, wherein: the initiator is potassium persulfate solution with the mass concentration of 4%.
4. The method for preparing neoprene latex with core-shell structure rubber particles as claimed in claim 2, wherein: and (5) after the reaction in the step (5) is finished, adding a stabilizer to stop the reaction, wherein the stabilizer is: 1 part by weight of toluene, 0.02 part by weight of phenothiazine, 0.8 part by weight of antioxidant 264, 1 part by weight of soft water and 1 part by weight of disproportionated rosin potassium soap.
5. The method for preparing neoprene latex with core-shell structure rubber particles as claimed in claim 2, wherein: in the step (4), the temperature of the system is adjusted to 40 +/-0.5 ℃.
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