Rapidly cured carboxylic butadiene-styrene latex and preparation method thereof

Abstract

The invention relates to a rapidly-cured carboxylic butadiene-styrene latex and a preparation method thereof, and belongs to the technical field of carboxylic butadiene-styrene latex. The rapid curing carboxylic butadiene-styrene latex comprises the following components: butadiene, styrene, unsaturated carboxylic acid, a crosslinking monomer, an emulsifier, an initiator, a molecular weight regulator, a buffering agent and deionized water. The crosslinking monomer is composed of a styrene derivative and N-hydroxymethyl acrylamide; according to the invention, styrene derivatives and N-hydroxymethyl acrylamide are introduced as cross-linking monomers, and when coated paper passes through a drying part, functional groups can be instantly activated by high temperature; the carbon-carbon double bond, the epoxy group and the hydroxyl group of the styrene derivative, and the hydroxymethyl group and the double bond of the N-hydroxymethyl acrylamide or the N-hydroxymethyl acrylamide can be subjected to a rapid cross-linking reaction, and a three-dimensional network structure is established to accelerate the curing process while the adhesive film is formed.

Description

Technical Field

[0001] This invention belongs to the technical field of carboxylated styrene-butadiene latex, and relates to a rapid curing method for carboxylated styrene-butadiene latex. Background Technology

[0002] Carboxylated styrene-butadiene latex is a crucial adhesive in the coating process of coated paper, and its performance directly affects the gloss, smoothness, printability, and strength of the coated paper. Traditional carboxylated styrene-butadiene latex, after being coated onto paper, requires a "heating" or "curing" stage. During this stage, the polymer chains, emulsifiers, additives, and other components in the latex undergo migration, rearrangement, and cross-linking processes over a certain period (usually several hours to tens of hours) to achieve the final mechanical and optical properties.

[0003] This lengthy maturation process has led to many adverse effects: 1. It occupies a lot of inventory space and time: Coated paper needs to be stored for a sufficient period of time before subsequent slitting, rewinding or printing processes can be carried out, which seriously restricts production efficiency and increases inventory costs.

[0004] 2. Lack of flexibility in production planning: It is difficult to achieve "apply and use immediately", which disrupts the rhythm of continuous production.

[0005] 3. Poor product quality stability: If the curing time is insufficient before proceeding to the next process, it may cause quality problems such as printing powdering and poor gloss. Summary of the Invention

[0006] The purpose of this invention is to provide a method for rapidly curing carboxylated styrene-butadiene latex and its preparation. This invention introduces styrene derivatives and N-hydroxymethylacrylamide as crosslinking monomers. When the coated paper passes through the drying section, the high temperature instantly activates these functional groups. The carbon-carbon double bonds, epoxy groups and hydroxyl groups of the styrene derivatives, and the hydroxymethyl groups of N-hydroxymethylacrylamide can undergo rapid crosslinking reactions with the double bonds or with themselves. A three-dimensional network structure is established at the same time as the adhesive film is formed, which accelerates the curing process.

[0007] The objective of this invention can be achieved through the following technical solutions: A fast-curing carboxylated styrene-butadiene latex comprises the following components by weight: 30-50 parts butadiene, 45-65 parts styrene, 1.5-4.0 parts unsaturated carboxylic acid, 2.5-4.0 parts crosslinking monomer, 1.0-3.5 parts emulsifier, 0.2-0.8 parts initiator, 0.1-0.5 parts molecular weight regulator, 0.1-0.3 parts buffer, and 110-140 parts deionized water.

[0008] As a preferred technical solution of the present invention, the present invention controls the polymer microstructure by precisely controlling the butadiene / styrene ratio and the amount of molecular weight regulator, thereby controlling the glass transition temperature and molecular chain segment mobility of the polymer, so that it can form a film quickly at the drying temperature and rapidly fix its structure under the action of crosslinking monomers.

[0009] As a preferred embodiment of the present invention, the unsaturated carboxylic acid is one or a combination of acrylic acid and methacrylic acid.

[0010] As a preferred embodiment of the present invention, the crosslinking monomer is composed of a styrene derivative and N-hydroxymethylacrylamide.

[0011] As a preferred embodiment of the present invention, the crosslinking monomer is composed of a styrene derivative and N-hydroxymethylacrylamide mixed in a mass ratio of 2.5-3.0:1.6-2.2. By introducing styrene derivative and N-hydroxymethylacrylamide as crosslinking monomers, the high temperature will instantly activate these functional groups when the coated paper passes through the drying section. The carbon-carbon double bonds, epoxy groups and hydroxyl groups of the styrene derivative, and the hydroxymethyl groups of N-hydroxymethylacrylamide can undergo rapid crosslinking reactions with the double bonds or themselves, thereby establishing a three-dimensional network structure and accelerating the curing process while the film is being formed.

[0012] As a preferred embodiment of the present invention, the emulsifier is composed of a reactive emulsifier and a nonionic emulsifier in a mass ratio of 1:1-3.

[0013] As a preferred embodiment of the present invention, the reactive emulsifier is sodium allyl hydroxypropanesulfonate or a maleic anhydride derivative; the nonionic emulsifier is alkylphenol polyoxyethylene ether or fatty alcohol polyoxyethylene ether. The present invention uses a combination of reactive emulsifier and nonionic emulsifier. The reactive emulsifier is covalently bonded to the polymer molecular chain and will not migrate during drying and film formation, thus avoiding the problem of slow performance changes caused by migration of traditional small molecule emulsifiers. This allows the film to have stable surface properties and intrinsic strength in the early stage of formation.

[0014] As a preferred embodiment of the present invention, the initiator is one or both of potassium persulfate and ammonium persulfate.

[0015] As a preferred embodiment of the present invention, the molecular weight regulator is one or more of tert-dodecyl mercaptan, n-dodecyl mercaptan, and n-butyritin.

[0016] As a preferred embodiment of the present invention, the buffer is one or both of sodium bicarbonate and sodium hydroxide.

[0017] As a preferred embodiment of the present invention, the method for preparing the styrene derivative includes the following steps: S1. Add aminostyrene, polymerization inhibitor and anhydrous solvent to the reactor, start stirring to obtain a mixture; S2. Maintaining an inert gas atmosphere, slowly add ethylene glycol diglycidyl ether to the mixture, then add the catalyst and stir to mix. Stir the reaction at a constant temperature, cool, and remove the anhydrous solvent by vacuum distillation to obtain the final product.

[0018] As a preferred embodiment of the present invention, in step S1, the stirring speed is 300-400 r / min and the stirring time is 30-45 min, the polymerization inhibitor is hydroquinone, the anhydrous solvent is anhydrous ethanol, and the aminostyrene is 4-aminostyrene.

[0019] As a preferred embodiment of the present invention, the inert gas atmosphere in step S2 is a nitrogen gas atmosphere, the stirring and mixing time is 6-10 min, the constant temperature stirring reaction temperature is 40-45℃, the rotation speed is 400-450 r / min, the reaction time is 4-6 h, and the cooling is cooling to room temperature.

[0020] As a preferred embodiment of the present invention, the mass ratio of aminostyrene, polymerization inhibitor, anhydrous solvent, ethylene glycol diglycidyl ether and catalyst in steps S1 and S2 is 10-12:0.032-0.036:70-85:22.5-25.0:0.8-0.9.

[0021] As a preferred embodiment of the present invention, a method for preparing rapidly cured carboxylated styrene-butadiene latex includes the following steps: a) Mix 30wt% deionized water, 80wt% emulsifier, styrene, unsaturated carboxylic acid and crosslinking monomer to prepare a pre-emulsion; b) Add 60wt% deionized water, 20wt% initiator, buffer and 10wt% preemulsion to the reactor, and carry out seed polymerization reaction at 85-90℃; c) After the seed reaction is completed, a mixture consisting of the remaining pre-emulsion, butadiene, molecular weight regulator, remaining emulsifier, remaining initiator and remaining deionized water is simultaneously added dropwise to the reactor, and the main polymerization reaction is carried out at 85-90℃. d) After the addition is complete, heat to 90-95℃ for curing; e) Cool the reaction product, adjust the pH to 6.0-8.0, and filter to obtain the rapidly cured carboxylated styrene-butadiene latex.

[0022] Compared with the prior art, the present invention has the following significant advantages: Achieving instant curing: When the latex of this invention is used to coat coated paper, the key indicators such as water resistance, surface strength, and gloss of the coating layer can reach or even exceed the level of traditional latex after 24 hours of storage at the outlet of the drying section of the coating machine (i.e., when the paper is unloaded), thus achieving "curing immediately after unloading".

[0023] Significantly improves production efficiency: It completely eliminates the curing and storage time required in traditional processes, speeds up the production cycle, reduces work-in-process inventory and space occupation, and facilitates lean production and rapid delivery.

[0024] The product boasts stable and excellent quality: By eliminating uncertainties in the curing process, the product performance is uniform and stable, effectively avoiding problems such as printing powdering caused by insufficient curing. Simultaneously, the use of reactive emulsifiers enhances the water resistance and gloss of the film.

[0025] High feasibility of the process: The preparation method of this invention is based on a mature emulsion polymerization process. The innovation is achieved only through monomer selection and formulation optimization. It is easy to implement on existing production equipment and has good prospects for industrialization. Detailed Implementation

[0026] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0027] Example 1 A fast-curing carboxylated styrene-butadiene latex comprises the following components by weight: 30 parts butadiene, 45 parts styrene, 1.5 parts unsaturated carboxylic acid, 2.5 parts crosslinking monomer, 1.0 part emulsifier, 0.2 parts initiator, 0.1 parts molecular weight regulator, 0.1 parts buffer, and 110 parts deionized water; The unsaturated carboxylic acid is acrylic acid; the crosslinking monomer is composed of a styrene derivative and N-hydroxymethylacrylamide mixed in a mass ratio of 2.5:1.6; the emulsifier is composed of sodium allyloxyhydroxypropanesulfonate and alkylphenol polyoxyethylene ether in a mass ratio of 1:1; the initiator is ammonium persulfate; the molecular weight regulator is tert-dodecyl mercaptan; and the buffer is sodium bicarbonate. The method for preparing the styrene derivative includes the following steps: S1. Add aminostyrene, a polymerization inhibitor, and an anhydrous solvent to the reactor and stir at 300 r / min for 30 min to obtain a mixture; the polymerization inhibitor is hydroquinone, the anhydrous solvent is anhydrous ethanol, and the aminostyrene is 4-aminostyrene. S2. Maintain a nitrogen atmosphere, slowly add ethylene glycol diglycidyl ether to the mixture, then add the catalyst and stir for 6 minutes. Stir at 40°C and 400 r / min for 4 hours. Cool to room temperature and remove the anhydrous solvent by vacuum distillation to obtain the final product. In steps S1 and S2, the mass ratio of aminostyrene, polymerization inhibitor, anhydrous solvent, ethylene glycol diglycidyl ether, and catalyst is 10:0.032:70:22.5:0.8; the catalyst is triethylamine.

[0028] A method for preparing rapidly cured carboxylated styrene-butadiene latex includes the following steps: a) Mix 30wt% deionized water, 80wt% emulsifier, styrene, unsaturated carboxylic acid and crosslinking monomer to prepare a pre-emulsion; b) Add 60wt% deionized water, 20wt% initiator, buffer and 10wt% preemulsion to the reactor, and carry out seed polymerization reaction at 85°C; c) After the seed reaction is completed, a mixture consisting of the remaining pre-emulsion, butadiene, molecular weight regulator, remaining emulsifier, remaining initiator and remaining deionized water is simultaneously added dropwise to the reactor, and the main polymerization reaction is carried out at 85°C. d) After the addition is complete, heat to 90℃ and maintain the temperature for maturation; e) Cool the reaction product, adjust the pH to 6.0, and filter to obtain the rapidly cured carboxylated styrene-butadiene latex.

[0029] Example 2 A fast-curing carboxylated styrene-butadiene latex comprises the following components by weight: 40 parts butadiene, 55 parts styrene, 2.8 parts unsaturated carboxylic acid, 3.2 parts crosslinking monomer, 2.2 parts emulsifier, 0.5 parts initiator, 0.3 parts molecular weight regulator, 0.2 parts buffer, and 125 parts deionized water; The unsaturated carboxylic acid is acrylic acid; the crosslinking monomer is composed of a styrene derivative and N-hydroxymethylacrylamide mixed in a mass ratio of 2.8:1.9; the emulsifier is composed of sodium allyloxyhydroxypropanesulfonate and alkylphenol polyoxyethylene ether in a mass ratio of 1:2; the initiator is ammonium persulfate; the molecular weight regulator is tert-dodecyl mercaptan; and the buffer is sodium bicarbonate. The method for preparing the styrene derivative includes the following steps: S1. Add aminostyrene, a polymerization inhibitor, and an anhydrous solvent to the reactor and stir at 350 r / min for 38 min to obtain a mixture; the polymerization inhibitor is hydroquinone, the anhydrous solvent is anhydrous ethanol, and the aminostyrene is 4-aminostyrene. S2. Maintaining a nitrogen atmosphere, slowly add ethylene glycol diglycidyl ether to the mixture, then add the catalyst and stir for 8 minutes. Keep the mixture at 42°C and 425 r / min for 5 hours. Cool to room temperature and remove the anhydrous solvent by vacuum distillation to obtain the final product. In steps S1 and S2, the mass ratio of aminostyrene, polymerization inhibitor, anhydrous solvent, ethylene glycol diglycidyl ether, and catalyst is 11:0.034:78:23.8:0.85; the catalyst is triethylamine.

[0030] A method for preparing rapidly cured carboxylated styrene-butadiene latex includes the following steps: a) Mix 30wt% deionized water, 80wt% emulsifier, styrene, unsaturated carboxylic acid and crosslinking monomer to prepare a pre-emulsion; b) Add 60wt% deionized water, 20wt% initiator, buffer and 10wt% preemulsion to the reactor, and carry out seed polymerization reaction at 88℃; c) After the seed reaction is completed, a mixture consisting of the remaining pre-emulsion, butadiene, molecular weight regulator, remaining emulsifier, remaining initiator and remaining deionized water is simultaneously added dropwise to the reactor, and the main polymerization reaction is carried out at 88°C. d) After the addition is complete, heat to 92℃ and maintain the temperature for maturation; e) Cool the reaction product, adjust the pH to 7, and filter to obtain the rapidly cured carboxylated styrene-butadiene latex.

[0031] Example 3 A fast-curing carboxylated styrene-butadiene latex comprises the following components by weight: 50 parts butadiene, 65 parts styrene, 4.0 parts unsaturated carboxylic acid, 4.0 parts crosslinking monomer, 3.5 parts emulsifier, 0.8 parts initiator, 0.5 parts molecular weight regulator, 0.3 parts buffer, and 140 parts deionized water. The unsaturated carboxylic acid is acrylic acid; the crosslinking monomer is composed of a styrene derivative and N-hydroxymethylacrylamide mixed in a mass ratio of 3.0:2.2; the emulsifier is composed of sodium allyloxyhydroxypropanesulfonate and alkylphenol polyoxyethylene ether in a mass ratio of 1:3; the initiator is ammonium persulfate; the molecular weight regulator is tert-dodecyl mercaptan; and the buffer is sodium bicarbonate. The method for preparing the styrene derivative includes the following steps: S1. Add aminostyrene, a polymerization inhibitor, and an anhydrous solvent to the reactor and stir at 400 r / min for 45 min to obtain a mixture; the polymerization inhibitor is hydroquinone, the anhydrous solvent is anhydrous ethanol, and the aminostyrene is 4-aminostyrene. S2. Maintain a nitrogen atmosphere, slowly add ethylene glycol diglycidyl ether to the mixture, then add the catalyst and stir for 10 min. Keep the mixture at 45℃ and 450 r / min for 6 h, cool to room temperature, and remove the anhydrous solvent by vacuum distillation to obtain the final product. In steps S1 and S2, the mass ratio of aminostyrene, polymerization inhibitor, anhydrous solvent, ethylene glycol diglycidyl ether, and catalyst is 12:0.036:85:25.0:0.9; the catalyst is triethylamine.

[0032] A method for preparing rapidly cured carboxylated styrene-butadiene latex includes the following steps: a) Mix 30wt% deionized water, 80wt% emulsifier, styrene, unsaturated carboxylic acid and crosslinking monomer to prepare a pre-emulsion; b) Add 60wt% deionized water, 20wt% initiator, buffer and 10wt% preemulsion to the reactor, and carry out seed polymerization reaction at 90°C; c) After the seed reaction is completed, a mixture consisting of the remaining pre-emulsion, butadiene, molecular weight regulator, remaining emulsifier, remaining initiator and remaining deionized water is simultaneously added dropwise to the reactor, and the main polymerization reaction is carried out at 90°C. d) After the addition is complete, heat to 95℃ and maintain the temperature for maturation; e) Cool the reaction product, adjust the pH to 8.0, and filter to obtain the rapidly cured carboxylated styrene-butadiene latex.

[0033] Comparative Example 1 Compared with Example 2, Comparative Example 1 differs in that the crosslinking monomer of Comparative Example 1 is a styrene derivative, while the other components, preparation steps and parameters are the same.

[0034] Comparative Example 2 Compared with Example 2, Comparative Example 2 differs in that the crosslinking monomer of Comparative Example 2 is N-hydroxymethylacrylamide, while the other components, preparation steps and parameters are the same.

[0035] Comparative Example 3 Compared with Example 2, Comparative Example 3 differs in that it uses aminostyrene instead of styrene derivatives, while the other components, preparation steps and parameters are the same.

[0036] Comparative Example 4 Compared with Example 2, Comparative Example 4 differs in that ethylene glycol diglycidyl ether is used instead of styrene derivative in Comparative Example 4, while the other components, preparation steps and parameters are the same.

[0037] The coating formula adopts the ordinary white cardboard coating formula. The top coat consists of 70 parts of grade 90 calcium carbonate, 30 parts of kaolin, 13 parts of latex, and some other additives. The intermediate and primer coats consist of 90 parts of grade 50 calcium carbonate, 10 parts of calcined kaolin, 11 parts of latex, and some other additives.

[0038] The primer, intermediate coat, and top coat were applied separately to the same coated paper. Samples were taken immediately at the outlet of the drying section of the coating machine (during paper unloading) for testing. The performance was tested, and the samples were tested again after 24 hours. The test results are shown in Table 1.

[0039] Table 1

[0040] As can be seen from the test results in Table 1, compared with Comparative Examples 1-4, the surface strength (IGT), water resistance (Cobb value), and gloss of the styrene-butadiene latex prepared in Examples 1-3 of the present invention reached or even exceeded the level of traditional latex after 24 hours of curing at the moment of paper application. Moreover, the effect of using styrene-butadiene latex with styrene derivatives and N-hydroxymethylacrylamide was even better. This fully proves that the present invention has achieved the technical effect of "instant curing".

[0041] This invention utilizes the styrene double bonds of styrene derivatives and the acrylamide double bonds of N-hydroxymethylacrylamide to achieve efficient free radical copolymerization with the double bonds of butadiene and styrene in the formulation under the action of an initiator. Simultaneously, it forms a stable bond with the carboxyl groups of unsaturated carboxylic acids, anchoring the functional structures of styrene derivatives and N-hydroxymethylacrylamide onto the styrene-butadiene latex backbone. The residual epoxy groups of the styrene derivatives can not only undergo nucleophilic ring-opening reactions with the N-hydroxymethyl groups of N-hydroxymethylacrylamide to form ether bonds, but also rapidly crosslink with the carboxyl groups of unsaturated carboxylic acids and the hydroxyl groups on the paper fiber surface. The N-hydroxymethyl groups of N-hydroxymethylacrylamide can self-condense to form methylene bridges, or further react with the hydroxyl groups generated by ring-opening of styrene derivatives and the carboxyl groups of unsaturated carboxylic acids, jointly constructing a multidimensional dense crosslinked network of "latex backbone - styrene derivative - N-hydroxymethylacrylamide - paper fiber". This network significantly enhances the interfacial bonding force between latex and fiber and the cohesive strength of the film, effectively suppresses paper linting and dusting, and significantly improves the surface strength of IGT.

[0042] In terms of water resistance, the densification of the cross-linked network physically blocks the water molecule penetration channels. At the same time, the hydrophobic structure of the benzene ring inherent in the styrene derivative, the amide bond of N-hydroxymethylacrylamide, the ether bond and methylene bridge generated by the reaction, synergistically with the hydrophobic properties of the high proportion of styrene in the formulation, reduce the hydrophilicity of the film, reduce the interaction between water molecules and the film and fibers, and thus significantly reduce the Cobb value.

[0043] In terms of gloss, the hydroxyl groups generated by the ring opening of styrene derivatives, the amide groups of N-hydroxymethylacrylamide, and the carboxyl groups of unsaturated carboxylic acids in the formulation work synergistically to enhance the spreadability and compatibility of latex particles, promote the rapid and uniform film formation of latex after papering, reduce the porosity and roughness of the film surface, and the more regular structure and smoother surface of the multidimensional cross-linked film improve the uniformity of light reflection, ultimately improving the gloss of the latex.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A rapidly curing carboxylated styrene-butadiene latex, characterized in that, The composition by weight is as follows: 30-50 parts butadiene, 45-65 parts styrene, 1.5-4.0 parts unsaturated carboxylic acid, 2.5-4.0 parts crosslinking monomer, 1.0-3.5 parts emulsifier, 0.2-0.8 parts initiator, 0.1-0.5 parts molecular weight regulator, 0.1-0.3 parts buffer, and 110-140 parts deionized water; The method for preparing the styrene derivative includes the following steps: S1. Add aminostyrene, polymerization inhibitor and anhydrous solvent to the reactor, start stirring to obtain a mixture; S2. Maintaining an inert gas atmosphere, slowly add ethylene glycol diglycidyl ether to the mixture, then add the catalyst and stir to mix. Stir the reaction at a constant temperature, cool, and remove the anhydrous solvent by vacuum distillation to obtain the final product.

2. The rapidly curing carboxylated styrene-butadiene latex according to claim 1, characterized in that: The unsaturated carboxylic acid is one or a combination of two of acrylic acid and methacrylic acid.

3. The rapidly curing carboxylated styrene-butadiene latex according to claim 1, characterized in that: The crosslinking monomer is composed of a styrene derivative and N-hydroxymethylacrylamide in a mass ratio of 2.5-3.0:1.6-2.

2.

4. The rapidly curing carboxylated styrene-butadiene latex according to claim 1, characterized in that: The emulsifier is composed of a reactive emulsifier and a nonionic emulsifier in a mass ratio of 1:1-3.

5. The rapidly curing carboxylated styrene-butadiene latex according to claim 1, characterized in that: The reactive emulsifier is sodium allyl hydroxypropanesulfonate or a maleic anhydride derivative; the nonionic emulsifier is alkylphenol polyoxyethylene ether or fatty alcohol polyoxyethylene ether.

6. The rapidly curing carboxylated styrene-butadiene latex according to claim 1, characterized in that: The initiator is one or both of potassium persulfate and ammonium persulfate; the molecular weight regulator is one or more of tert-dodecyl mercaptan, n-dodecyl mercaptan, and n-butyrate; and the buffer is one or both of sodium bicarbonate and sodium hydroxide.

7. The rapidly curing carboxylated styrene-butadiene latex according to claim 1, characterized in that: In step S1, the stirring speed is 300-400 r / min and the stirring time is 30-45 min.

8. The rapidly curing carboxylated styrene-butadiene latex according to claim 1, characterized in that: The temperature of the constant temperature stirring reaction in step S2 is 40-45℃, the rotation speed is 400-450r / min, and the reaction time is 4-6h.

9. The rapidly curing carboxylated styrene-butadiene latex according to claim 1, characterized in that: The mass ratio of aminostyrene, polymerization inhibitor, anhydrous solvent, ethylene glycol diglycidyl ether, and catalyst in steps S1 and S2 is 10-12. 0.032-0.036：70-85： 22.5-25.0：0.8-0.9。 10. A method for preparing rapidly cured carboxylated styrene-butadiene latex as described in any one of claims 1-9, characterized in that, Includes the following steps: a) Mix 30wt% deionized water, 80wt% emulsifier, styrene, unsaturated carboxylic acid and crosslinking monomer to prepare a pre-emulsion; b) Add 60wt% deionized water, 20wt% initiator, buffer and 10wt% preemulsion to the reactor, and carry out seed polymerization reaction at 85-90℃; c) After the seed reaction is completed, a mixture consisting of the remaining pre-emulsion, butadiene, molecular weight regulator, remaining emulsifier, remaining initiator and remaining deionized water is simultaneously added dropwise to the reactor, and the main polymerization reaction is carried out at 85-90℃. d) After the addition is complete, heat to 90-95℃ for curing; e) Cool the reaction product, adjust the pH to 6.0-8.0, and filter to obtain the rapidly cured carboxylated styrene-butadiene latex.

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