Flame-retardant water-based adhesive and preparation method thereof

Abstract

The invention provides a preparation method of a flame-retardant water-based adhesive, and relates to the technical field of high polymer materials, the preparation method comprises the following preparation steps: 1, preparing a functional polyvinyl chloride seed emulsion; and 2, preparing the flame-retardant water-based adhesive. The flame-retardant water-based adhesive prepared by the preparation method disclosed by the invention not only has excellent adhesion performance of the traditional water-based adhesive, but also has excellent intrinsic flame retardance, and an additional flame retardant is not needed. In the preparation process of the flame-retardant water-based adhesive, an organic solvent does not need to be added, and water is completely used as a reaction and dispersion medium; and no volatile organic compound is generated in the use process, so that the paint is green and environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a flame retardant water-based adhesive and a preparation method thereof. Background Art

[0002] Fiber fabric products are widely used in all aspects of life. In order to improve the service life, appearance and feel of fabric products, glue is usually used for bonding.

[0003] Currently, the commonly used fabric glues mainly include polyacrylate, epoxy resin and water-based polyurethane. Although the existing above-mentioned glues have excellent adhesion, they are not flame retardant and cannot play their role in some specific occasions such as occasions where flame retardancy is required.

[0004] Although adding flame retardants can significantly improve the flame retardant properties of the above-mentioned glue, the addition of flame retardants will reduce the adhesive properties of the glue. How to ensure its adhesion while improving its flame retardant properties has always been a difficult problem in the industry, and it is also a scientific and technological problem that the industry urgently needs to solve. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the present invention provides a flame retardant water-based glue and a preparation method thereof, which solves the technical problem that the existing fabric glue has poor flame retardancy.

[0007] (II) Technical solution

[0008] The present invention aims to solve the problem that the existing fabric glue has insufficient flame retardant performance, and provides a flame retardant water-based glue and a preparation method thereof. The water-based glue prepared by the present invention not only has excellent adhesion, but also has excellent flame retardancy without adding an external flame retardant, and has a good application prospect in the field of flammable fiber fabrics.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] The method for preparing a flame retardant water-based adhesive comprises the following steps:

[0011] Step 1: preparing functional polyvinyl chloride seed emulsion;

[0012] Step 2: Prepare flame retardant water-based adhesive.

[0013] Preferably, the functional polyvinyl chloride seed emulsion has a solid content of 37±3% and a particle size of 60-200 nm;

[0014] The preparation method thereof comprises the following steps:

[0015] (1) Add deionized water to a polymerization reactor, then add a NaOH aqueous solution, then add potassium laurate, ferrous sulfate, bleaching powder and EDTA, stir evenly, evacuate to -0.07 to -0.08 MPa, and add liquid vinyl chloride (VCM) monomer all at once;

[0016] (2) The polymerization kettle is heated to 52-58° C., the pressure is controlled at 0.075-0.085 MPa, and potassium persulfate is added dropwise to initiate polymerization of vinyl chloride (VCM) monomer. During the polymerization, sodium dodecylbenzene sulfonate and acrylate monomer or vinyl acetate monomer are continuously added dropwise. When the vinyl chloride conversion rate reaches 75-85% and all monomer droplets disappear, the reaction is complete;

[0017] (3) After the reaction is completed, the unreacted vinyl chloride (VCM) monomer is removed by degassing and vacuuming to obtain a functional polyvinyl chloride seed emulsion.

[0018] Preferably, the amount of the acrylic acid ester monomer or vinyl acetate monomer added is 1%-5% of the VCM monomer.

[0019] Preferably, the method for preparing the flame retardant water-based adhesive is: using functional polyvinyl chloride emulsion as seed emulsion, adding acrylate monomer, styrene monomer, cross-linking agent, assisted by emulsifier, initiator, and auxiliary cross-linking agent, and preparing the flame retardant water-based adhesive by seed emulsion polymerization.

[0020] Preferably, the flame retardant water-based glue has a solid content of 35-50%, and its preparation method comprises the following steps:

[0021] (1) Preparation before polymerization: add deionized water to a pre-emulsification tank, add an emulsifier and an initiator while stirring, then add an acrylate monomer, a styrene monomer, and a cross-linking agent as copolymer monomers, stir evenly to obtain a pre-emulsion for use; add deionized water to a polymerization kettle, add a functional polyvinyl chloride seed emulsion and an emulsifier while stirring, and heat to 78-82° C. to obtain a pre-emulsion;

[0022] (2) Polymerization: Add initiator to the polymerization kettle, stir evenly and continuously add pre-emulsion dropwise. The dropping time is controlled within 2-3.5 hours. The polymerization temperature is controlled within 80-85°C. After the dropping is completed, keep the temperature at 80-85°C for 1-2 hours. The polymerization is then completed.

[0023] (3) Post-treatment: After the heat preservation is completed, the temperature is lowered to 70-75°C, tert-butyl hydroperoxide is added to the reaction kettle, and the aqueous solution of bleaching powder is added dropwise. The dropping time is controlled at 0.5-1h. After the dropping is completed, the temperature is kept at 70-75°C for 0.5h, and the post-stabilization treatment is completed;

[0024] (4) Discharging: Cool down to 45-55°C, add a cross-linking agent, adjust the pH of the emulsion to 7.5-8.5 with ammonia water or dilute sodium hydroxide, cool down to below 40°C, add other additives, and obtain a flame-retardant water-based adhesive.

[0025] Preferably, the mass percentage of polyvinyl chloride in the solid content of the flame-retardant water-based glue is 20%-60%, and the mass percentage of other components is 40%-80%.

[0026] Preferably, the acrylic acid ester monomer is a mixture of one or more of methyl methacrylate, butyl methacrylate, butyl acrylate, methyl acrylate, isooctyl acrylate, isopentyl acrylate, and glycidyl acrylate.

[0027] Preferably, the crosslinking agent is a mixture of one or more of hydroxymethyl acrylamide, hydroxyethyl acrylate, acrylic acid, methacrylic acid, acrylamide, diacetone acrylamide and adipic acid dihydrazide or a composite system of ethyl acetoacetate methacrylate and hexamethylenediamine.

[0028] Preferably, the amount of the emulsifier is 2%-8% of the solid content of the aqueous glue, and the emulsifier is a mixture of one or more of potassium laurate, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, alkylphenol polyoxyethylene ether, polyoxyethylene alkyl ester, sodium cetyl betaine, and polyoxyethylene alkyl aryl ester.

[0029] Preferably, the emulsifier is a mixture of anionic and nonionic surfactants, and the mass ratio of anionic to nonionic surfactants is 0.8:1-1:5.

[0030] Preferably, the amount of the initiator is 0.3%-0.8% of the mass of the mixed monomers, and the initiator is potassium persulfate or ammonium persulfate.

[0031] Preferably, the auxiliary cross-linking agent is one of adipic acid dihydrazide or hexamethylenediamine, or a mixture of the two.

[0032] (III) Beneficial effects

[0033] The present invention provides a flame retardant water-based adhesive and a preparation method thereof. Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The flame-retardant water-based adhesive prepared by the preparation method of the present invention not only has the excellent adhesion performance of traditional water-based adhesives, but also has excellent intrinsic flame retardancy and does not require an external flame retardant.

[0035] 2. No organic solvent needs to be added during the preparation of the flame-retardant water-based adhesive of the present invention, and water is completely used as the reaction and dispersion medium; no volatile organic compounds are generated during use, which is green and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 This is a particle size diagram of the functional modified polyvinyl chloride seed emulsion in Example 1 of the present invention;

[0038] Figure 2 This is a particle size diagram of the flame retardant water-based adhesive of Example 1 of the present invention;

[0039] Figure 3 For un-gummed carpet fabric;

[0040] Figure 4 The carpet fabric is coated with the flame retardant water-based adhesive prepared in Example 1;

[0041] Figure 5 This is a particle size diagram of the flame retardant water-based adhesive of Example 2 of the present invention;

[0042] Figure 6 The carpet fabric is coated with the flame retardant water-based adhesive prepared in Example 2;

[0043] Figure 7 This is a particle size diagram of the functional modified polyvinyl chloride seed emulsion in Example 3 of the present invention;

[0044] Figure 8 This is a particle size diagram of the flame retardant water-based glue in Example 3 of the present invention;

[0045] Fig. 9 For uncoated fabric;

[0046] Fig.10 The fabric is coated with the flame-retardant water-based adhesive prepared in Example 3;

[0047] Fig.11 This is a particle size diagram of the flame retardant water-based glue in Example 4 of the present invention;

[0048] Fig.12 The cloth is coated with the flame retardant water-based adhesive prepared in Example 4. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The embodiments of the present application provide a flame retardant water-based glue and a preparation method thereof, thereby solving the technical problem of poor flame retardancy of existing fabric glues.

[0051] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0052] The emulsifier described in the embodiment of the present invention is a mixture of one or more of potassium laurate, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, alkylphenol polyoxyethylene ether, polyoxyethylene alkyl ester, sodium cetyl betaine, and polyoxyethylene alkyl aryl ester.

[0053] In some specific embodiments, the emulsifier is a mixture of anionic and nonionic surfactants, and the mass ratio of the anionic to nonionic surfactants is 0.8:1-1:5.

[0054] Embodiment 1:

[0055] The method for preparing a flame retardant water-based adhesive comprises the following steps:

[0056] Step 1: Preparation of functional polyvinyl chloride seed emulsion:

[0057] (1) Add deionized water to a polymerization reactor, then add a NaOH aqueous solution, adjust the system environment to alkaline and maintain the alkaline environment, then add potassium laurate, ferrous sulfate, bleaching powder and EDTA, stir evenly and evacuate to -0.07 MPa, and add liquid vinyl chloride (VCM) monomer all at once;

[0058] (2) The polymerization kettle is heated to 55° C. and the pressure is controlled at 0.075 MPa. Potassium persulfate is added dropwise to initiate polymerization of vinyl chloride (VCM) monomer. Sodium dodecylbenzene sulfonate (70% of the total amount) and butyl acrylate are added dropwise continuously during the polymerization process. When the conversion rate of vinyl chloride (VCM) monomer reaches 55-65%, the remaining sodium dodecylbenzene sulfonate is added at one time. When the conversion rate of vinyl chloride (VCM) monomer reaches 75-85%, all monomer droplets disappear and the reaction is completed.

[0059] (3) After the reaction is completed, the unreacted vinyl chloride (VCM) monomer is removed by degassing and vacuuming to obtain an acrylate-modified polyvinyl chloride seed emulsion.

[0060] The specific amounts of materials used in step 1 are shown in Table 1 below.

[0061] Table 1 - Materials and quantities used in step 1

[0062] Deionized water Potassium laurate Ferrous Sulfate Whitening block EDTA 10kg 10.5g 0.3g 3.0g 1.5g VCM monomer Potassium sulfate Sodium dodecylbenzenesulfonate Polymerization temperature Butyl acrylate Hydroxyethyl Methacrylate 12kg 1.75g 150g 55℃ 1.0kg 0.5kg

[0063] Acrylate modified polyvinyl chloride seed emulsion indicators:

[0064] Solid content: 37.1%, pH: 7.5-8, average particle size: 0.11μm ( Figure 1 ).

[0065] Step 2: Preparation of flame retardant water-based adhesive:

[0066] (1) Preparation before polymerization: deionized water is added to a pre-emulsification tank, an emulsifier and an initiator are added during stirring, and then acrylate monomer, styrene monomer, and a cross-linking agent are added, and stirred to obtain a pre-emulsion for use; deionized water is added to a polymerization kettle, and acrylate-modified polyvinyl chloride seed emulsion is added during stirring, and the temperature is raised to 78° C. to obtain a pre-emulsion;

[0067] (2) Polymerization: Add initiator to the polymerization kettle, stir evenly and continuously add pre-emulsion, the addition time is controlled within 2 hours, and the polymerization temperature is controlled at 80°C; after the addition is completed, keep the temperature at 80°C for 1 hour, and the polymerization is completed;

[0068] (3) Post-treatment: After the heat preservation is completed, the temperature is lowered to 70°C, tert-butyl hydroperoxide is added to the reactor, and the aqueous solution of bleaching powder is added dropwise. The dropping time is controlled within 0.5 h. After the dropping is completed, the temperature is kept at 70°C for 0.5 h, and the post-stabilization treatment is completed;

[0069] (4) Discharging: Cool down to 45°C, add adipic acid dihydrazide as a co-crosslinking agent, adjust the pH of the emulsion to 8 with ammonia water or dilute sodium hydroxide, and cool down to below 40°C to obtain a flame-retardant water-based latex.

[0070] The specific amounts of materials used in step 2 are shown in Table 2 below.

[0071] Table 2 - Materials and quantities used in step 2

[0072]

[0073] Flame retardant water-based latex finished product indicators:

[0074] Solid content: 35.9%, pH: 9-10, average particle size: 0.12μm ( Figure 2 ), viscosity 190mPa·s.

[0075] Embodiment 2 is different from Embodiment 1 in that:

[0076] The material formula and dosage of step 2 are changed as shown in Table 3 below:

[0077] Table 3 - Materials and quantities used in step 2

[0078]

[0079]

[0080] (1) Preparation before polymerization: add deionized water to the pre-emulsification tank, add emulsifier and initiator while stirring, then add acrylate monomer, styrene monomer, and cross-linking agent, stir evenly to obtain pre-emulsion for use; add deionized water to the polymerization kettle, add acrylate-modified polyvinyl chloride seed emulsion while stirring, and heat to 78°C;

[0081] (2) Polymerization: Add initiator to the polymerization kettle, stir evenly and continuously add pre-emulsion, the addition time is controlled within 2.5 hours, and the polymerization temperature is controlled at 80°C; after the addition is completed, keep the temperature at 80°C for 1.5 hours, and the polymerization is completed;

[0082] (3) Post-treatment: After the heat preservation is completed, the temperature is lowered to 70°C, tert-butyl hydroperoxide is added to the reactor, and the aqueous solution of bleaching powder is added dropwise. The dropping time is controlled within 0.5 h. After the dropping is completed, the temperature is kept at 70°C for 0.5 h, and the post-stabilization treatment is completed;

[0083] (4) Discharging: Cool down to 50°C, add adipic acid dihydrazide as a co-crosslinking agent, adjust the pH of the emulsion to 8 with ammonia water or dilute sodium hydroxide, and cool down to below 40°C to obtain a flame retardant water-based latex.

[0084] Finished product indicators:

[0085] Solid content: 36.5%, pH: 10-11, average particle size: 0.135μm ( Figure 5 ), viscosity 450mPa·s.

[0086] Embodiment 3:

[0087] Step 1: Preparation of functional polyvinyl chloride seed emulsion:

[0088] (1) Add deionized water to the polymerization reactor, then add NaOH aqueous solution to maintain the alkaline environment of the system, then add potassium laurate, ferrous sulfate, bleaching powder and EDTA, stir evenly and evacuate to -0.07MPa, and add liquid vinyl chloride (VCM) monomer at one time;

[0089] (2) The polymerization kettle is heated to 55° C. and the pressure is controlled at 0.075-0.085 MPa. Potassium persulfate is added dropwise to initiate polymerization of vinyl chloride (VCM) monomer. During the polymerization, sodium dodecylbenzene sulfonate (70% of the total amount) and acrylic acid monomer are added dropwise continuously. When the reaction conversion rate reaches 55-65%, the remaining sodium dodecylbenzene sulfonate is added at one time. When the conversion rate reaches 75-85%, all monomer droplets disappear and the reaction is completed.

[0090] (3) After the reaction is completed, the unreacted vinyl chloride (VCM) monomer is removed by degassing and vacuuming to obtain an acrylate-modified polyvinyl chloride seed latex.

[0091] The specific amounts of materials used in step 1 are shown in Table 4 below.

[0092] Table 4 - Materials and quantities used in step 1

[0093]

[0094] Finished product indicators:

[0095] Solid content: 34.4%, pH: 7.5-8, average particle size: 0.17μm ( Figure 7 ).

[0096] Step 2: Preparation of flame retardant water-based adhesive:

[0097] (1) Preparation before polymerization: add deionized water to the pre-emulsification tank, add emulsifier and initiator while stirring, then add acrylate monomer, styrene monomer, and cross-linking agent, stir evenly to obtain pre-emulsion for use; add deionized water to the polymerization kettle, add composite latex while stirring, and heat to 82°C;

[0098] (2) Polymerization: Add initiator to the polymerization kettle, stir evenly and continuously add pre-emulsion, the addition time is controlled within 3.5 hours, and the polymerization temperature is controlled at 85°C; after the addition is completed, keep the temperature at 85°C for 2 hours, and the polymerization is completed;

[0099] (3) Post-treatment: After the heat preservation is completed, the temperature is lowered to 75°C, tert-butyl hydroperoxide is added to the reactor, and the aqueous solution of bleaching powder is added dropwise. The dropping time is controlled within 1 hour. After the dropping is completed, the temperature is kept at 75°C for 0.5 hour, and the post-stabilization treatment is completed;

[0100] (4) Discharging: Cool down to 55°C, add hexamethylenediamine as a cross-linking agent, adjust the pH of the emulsion to 8.5 with aqueous ammonia or dilute sodium hydroxide, and cool down to below 40°C to obtain a flame retardant water-based latex.

[0101] The specific amounts of materials used in step 2 are shown in Table 5 below.

[0102] Table 5 - Materials and quantities used in step 2

[0103]

[0104]

[0105] Finished product indicators:

[0106] Solid content: 47.32%, pH: 6.5-7, average particle size: 0.189μm ( Figure 8 ), viscosity 850mPa·s.

[0107] Embodiment 4 is different from Embodiment 3 in that:

[0108] The material formula used in step 2 is changed, as shown in Table 6 below:

[0109] Table 6 - Materials and quantities used in step 2

[0110]

[0111] (1) Preparation before polymerization: add deionized water to the pre-emulsification tank, add emulsifier and initiator while stirring, then add acrylate monomer, styrene monomer, and cross-linking agent, stir evenly to obtain pre-emulsion for use; add deionized water to the polymerization kettle, add composite latex while stirring, and heat to 82°C;

[0112] (2) Polymerization: Add initiator to the polymerization kettle, stir evenly and continuously add pre-emulsion dropwise. The dropping time is controlled within 3.5 hours. The polymerization temperature is controlled within 85°C. After the dropping is completed, keep the temperature at 85°C for 2 hours. The polymerization is completed.

[0113] (3) Post-treatment: After the heat preservation is completed, the temperature is lowered to 75°C, tert-butyl hydroperoxide is added to the reactor, and the aqueous solution of bleaching powder is added dropwise. The dropping time is controlled within 1 hour. After the dropping is completed, the temperature is kept at 75°C for 0.5 hour, and the post-stabilization treatment is completed;

[0114] (4) Discharging: Cool down to 55°C, add hexamethylenediamine as a cross-linking agent, adjust the pH of the emulsion to 8.5 with aqueous ammonia or dilute sodium hydroxide, and cool down to below 40°C to obtain a flame retardant water-based latex.

[0115] Finished product indicators:

[0116] Solid content: 47.39%, pH: 6.5-7, average particle size: 0.197μm ( Fig.11 ), viscosity 1200mPa·s.

[0117] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0118] 1. The flame-retardant water-based adhesive prepared according to the preparation method of the present invention not only has the excellent adhesion performance of traditional water-based adhesives, but also has excellent intrinsic flame retardancy and does not require an external flame retardant.

[0119] 2. No organic solvent needs to be added during the preparation of the flame-retardant water-based adhesive of the present invention, and water is completely used as the reaction and dispersion medium; no volatile organic compounds are generated during use, which is green and environmentally friendly.

[0120] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0121] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a flame retardant water-based adhesive, characterized in that: The method comprises the following preparation steps: Step 1: preparing functional polyvinyl chloride seed emulsion; Step 2: Prepare flame retardant water-based adhesive.

2. The method for preparing the flame retardant water-based adhesive according to claim 1, characterized in that: The functional polyvinyl chloride seed emulsion has a solid content of 37±3% and a particle size of 60-200 nm; The preparation method thereof comprises the following steps: (1) Add deionized water to a polymerization reactor, then add a NaOH aqueous solution, then add potassium laurate, ferrous sulfate, bleaching powder and EDTA, stir evenly, evacuate to -0.07 to -0.08 MPa, and add liquid vinyl chloride (VCM) monomer all at once; (2) The polymerization kettle is heated to 52-58° C., the pressure is controlled at 0.075-0.085 MPa, and potassium persulfate is added dropwise to initiate polymerization of vinyl chloride (VCM) monomer. During the polymerization, sodium dodecylbenzene sulfonate and acrylate monomer or vinyl acetate monomer are continuously added dropwise. When the vinyl chloride conversion rate reaches 75-85% and all monomer droplets disappear, the reaction is complete; (3) After the reaction is completed, the unreacted vinyl chloride (VCM) monomer is removed by degassing and vacuuming to obtain a functional polyvinyl chloride seed emulsion.

3. The method for preparing the flame retardant water-based adhesive according to claim 2, characterized in that: The amount of the acrylic acid ester monomer or vinyl acetate monomer added is 1%-5% of the VCM monomer.

4. The method for preparing the flame retardant water-based adhesive according to claim 3, characterized in that: The method for preparing the flame retardant water-based adhesive is as follows: functional polyvinyl chloride emulsion is used as seed emulsion, and then acrylate monomer, styrene monomer, crosslinking agent, emulsifier, initiator, and auxiliary crosslinking agent are added to prepare the flame retardant water-based adhesive through seed emulsion polymerization.

5. The method for preparing the flame retardant water-based adhesive according to claim 4, characterized in that: The flame retardant water-based glue has a solid content of 35-50%, and its preparation method comprises the following steps: (1) Preparation before polymerization: add deionized water to a pre-emulsification tank, add an emulsifier and an initiator while stirring, then add an acrylate monomer, a styrene monomer, and a cross-linking agent as copolymer monomers, stir evenly to obtain a pre-emulsion for use; add deionized water to a polymerization kettle, add a functional polyvinyl chloride seed emulsion and an emulsifier while stirring, and heat to 78-82° C. to obtain a pre-emulsion; (2) Polymerization: Add initiator to the polymerization kettle, stir evenly and continuously add pre-emulsion dropwise. The dropping time is controlled within 2-3.5 hours. The polymerization temperature is controlled within 80-85°C. After the dropping is completed, keep the temperature at 80-85°C for 1-2 hours. The polymerization is then completed. (3) Post-treatment: After the heat preservation is completed, the temperature is lowered to 70-75°C, tert-butyl hydroperoxide is added to the reaction kettle, and the aqueous solution of bleaching powder is added dropwise. The dropping time is controlled at 0.5-1h. After the dropping is completed, the temperature is kept at 70-75°C for 0.5h, and the post-stabilization treatment is completed; (4) Discharging: Cool down to 45-55°C, add a cross-linking agent, adjust the pH of the emulsion to 7.5-8.5 with ammonia water or dilute sodium hydroxide, cool down to below 40°C, add other additives, and obtain a flame-retardant water-based adhesive.

6. The method for preparing the flame retardant water-based adhesive according to claim 5, characterized in that: The mass percentage of polyvinyl chloride in the solid content of the flame-retardant water-based glue is 20%-60%, and the mass percentage of other components is 40%-80%.

7. The method for preparing the flame retardant water-based adhesive according to claim 5, characterized in that: The acrylic acid ester monomer is a mixture of one or more of methyl methacrylate, butyl methacrylate, butyl acrylate, methyl acrylate, isooctyl acrylate, isopentyl acrylate, and glycidyl acrylate.

8. The method for preparing the flame retardant water-based adhesive according to claim 5, characterized in that: The crosslinking agent is a mixture of one or more of hydroxymethyl acrylamide, hydroxyethyl acrylate, acrylic acid, methacrylic acid, acrylamide, diacetone acrylamide and adipic acid dihydrazide or a composite system of ethyl acetoacetate methacrylate and hexamethylenediamine.

9. The method for preparing the flame retardant water-based adhesive according to claim 5, characterized in that: The emulsifier is used in an amount of 2%-8% of the solid content of the aqueous glue. The emulsifier is a mixture of one or more of potassium laurate, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, alkylphenol polyoxyethylene ether, polyoxyethylene alkyl ester, sodium cetyl betaine, and polyoxyethylene alkyl aryl ester.

10. The method for preparing the flame retardant water-based adhesive according to claim 5, characterized in that: The emulsifier is a compound of anionic and nonionic surfactants, and the mass ratio of the anionic and nonionic surfactants is 0.8:1-1:

5.

11. The method for preparing the flame retardant water-based adhesive according to claim 5, characterized in that: The dosage of the initiator is 0.3%-0.8% of the mass of the mixed monomers, and the initiator is potassium persulfate or ammonium persulfate.

12. The method for preparing the flame retardant water-based adhesive according to claim 5, characterized in that: The auxiliary cross-linking agent is one of adipic acid dihydrazide or hexamethylenediamine or a mixture of the two.

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