A method for preparing modified bio-based itaconate rubber and flexible material

Abstract

The present invention relates to the field of rubber technology, and specifically to a method for preparing a modified bio-based itaconate rubber solution and a flexible material. The present invention adds bio-based monomers and allyl glycidyl ether as functional monomers to carry out long side chain grafting modification on bio-based itaconate rubber, thereby preparing bio-based flexible materials and impact-resistant tapes. The molecular chain of the synthesized modified bio-based itaconate rubber is relatively flexible, and the modification of the bio-based monomer gives it a longer side chain, thus having a larger free volume. Through cross-linking, it has good mechanical strength, and the balanced design of flexibility and strength enables the material to release external force impact well. The modified bio-based itaconate rubber solution and flexible material prepared by the present invention are bio-based environmentally friendly materials. The preparation process of the flexible material does not undergo foaming, which simplifies the production process of the impact-resistant material and solves the problem of poor base adhesion when preparing impact-resistant tapes.

Description

Technical Field

[0001] The present invention relates to the field of rubber technology, in particular to a preparation method of a modified bio-based itaconate rubber and a flexible material. Background Art

[0002] The continuous upgrading of electronic products is placing higher demands on functional adhesive materials. Currently, electronic products such as computers, mobile phones, and notebooks are becoming increasingly lightweight and thinner, and display screens are growing larger. This places increasing demands on the functional adhesive tapes used to bond the body and display. These tapes must not only possess excellent bond strength and shear resistance, but also possess superior cushioning properties. Furthermore, with technological innovation and economic development, China is vigorously advocating for green and sustainable development, which in turn places higher demands on the development of functional materials.

[0003] Currently, the buffer tapes that meet such applications are mainly achieved through foaming. After foaming, the roughness of the base material will increase accordingly, which will affect the base adhesion effect, easily cause debonding during application, and the process is also more complicated. Today, internationally renowned companies including 3M and Nitto all use petroleum-based tapes, which are not in line with the current trend of sustainable development.

[0004] In order to solve the above problems, the present invention provides a method for preparing a modified bio-based itaconate rubber and a flexible material. Summary of the Invention

[0005] The object of the present invention is to provide a method for preparing a modified bio-based itaconate rubber and a flexible material to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A method for preparing a modified bio-based itaconate rubber solution comprises the following steps: taking bio-based itaconate rubber and a solvent, passing nitrogen protection, heating to 38-42°C, and stirring for 1-2 hours until the rubber is dissolved; continuing to heat to 83-86°C, adding a bio-based monomer and a functional monomer, stirring for 1-1.2 hours, adding an initiator and continuing the reaction for 3-4.5 hours to obtain a mixture; dissolving an antioxidant in a solvent, adding the mixture to the mixture, stirring for 10-15 minutes, cooling to 30-35°C, and discharging to obtain a modified bio-based itaconate rubber solution.

[0008] More optimally, the modified bio-based itaconate rubber solution comprises the following components: by weight, 80-120 parts of bio-based itaconate rubber, 15-55 parts of bio-based monomer, 0.1-3 parts of functional monomer, 0.1-0.3 parts of initiator, 1-3 parts of antioxidant, and 300-450 parts of solvent.

[0009] More optimally, the bio-based carbon content of the bio-based monomer is 70%-100%; the bio-based monomer is bio-based isodecyl methacrylate (brand: IDMA), bio-based isobornyl methacrylate (brand: SARBIO6105), bio-based isobornyl acrylate (brand: SARBIO5102), bio-based tridecyl methacrylate (brand: SARBIO6101), bio-based heptadecanyl methacrylate (brand: TERRA C17-MA), bio-based octadecyl methacrylate (brand: Any one or more of TERRA C18-MA).

[0010] More optimally, the functional monomer is allyl glycidyl ether.

[0011] More optimally, the initiator is any one or more of dibenzoyl peroxide, azobisisobutyronitrile, azobisisobutyramidine hydrochloride, azoisobutylcyanamide, di-tert-butyl peroxide, dodecyl peroxide, tert-butyl peroxyvalerate, diisopropyl peroxydicarbonate, and cumene hydroperoxide; the antioxidant is any one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 164, antioxidant CA, antioxidant DNP, antioxidant DLTP, antioxidant TNP, and antioxidant TPP; and the solvent is any one or more of n-butyl acetate, sec-butyl acetate, n-amyl acetate, sec-amyl acetate, toluene, xylene, butanone, acetone, cyclohexanone, N,N-dimethylformamide, dimethyl sulfoxide, carbon tetrachloride, and tetrahydrofuran.

[0012] More optimally, the preparation method of the bio-based itaconate rubber comprises the following steps:

[0013] Step 1: Take sodium dodecylbenzenesulfonate, add deionized water, potassium phosphate, and potassium chloride, and stir to dissolve in a 58-62°C water bath to obtain a dissolved emulsifier solution; cool the dissolved emulsifier solution to below 20°C and add it to the flask;

[0014] Step 2: Add sodium formaldehyde sulfoxylate aqueous solution and EDTA sodium iron salt aqueous solution;

[0015] Step 3: Take di-n-butyl itaconate and isoprene, mix them evenly, add them to the above flask, seal it, and pre-emulsify for 0.5-1.5 hours;

[0016] Step 4: Dissolve tert-butyl hydroperoxide solution in toluene, add the solution to the above flask, blow nitrogen for 55-65 seconds, seal, initiate polymerization, react for 11-13 hours to obtain bio-itaconate elastomer latex, demulsify and dry to obtain bio-based itaconate rubber.

[0017] The bio-based itaconate rubber has a glass transition temperature range of -60 to -10°C, a number average molecular weight range of 200,000 to 1,000,000, and a molecular weight distribution of 2.0 to 4.3. Its viscosity ranges from 100 to 2,500 cps under the condition of 20% solid content in solvent toluene.

[0018] A method for preparing a flexible material comprises the following steps: adding a black color paste to a modified bio-based itaconate rubber solution, stirring for 20-25 minutes, adding a curing agent, stirring for 10-15 minutes to obtain a glue solution, coating the glue solution on a PET release film, and drying to obtain the flexible material.

[0019] More optimally, by weight, 80-150 parts of modified bio-based itaconate rubber solution, 1-3 parts of black color paste, and 0.5-5 parts of curing agent.

[0020] More optimally, the curing agent is any one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention modifies bio-based itaconate rubber by grafting long side chains to prepare bio-based flexible materials and impact-resistant tapes. The synthesized modified bio-based itaconate rubber has a relatively flexible molecular chain. One or more of bio-based isodecyl methacrylate, bio-based isobornyl methacrylate, bio-based isobornyl acrylate, bio-based tridecyl methacrylate, bio-based heptadecanyl methacrylate, and bio-based octadecyl methacrylate are selected as bio-based monomers. These are modified to have longer side chains and thus a larger free volume. Through cross-linking, the material has good mechanical strength. The balanced design of flexibility and strength enables the material to effectively release external impact.

[0023] (2) The present invention uses allyl glycidyl ether as a functional monomer, which can further react with the acrylic adhesive on both sides, and the -O- in the functional monomer can form hydrogen bonds with the molecules in the acrylic adhesive, thereby solving the problem of poor base adhesion when preparing impact-resistant tapes through the path of chemical reaction.

[0024] (3) The modified bio-based itaconate rubber and flexible material prepared by the present invention are bio-based and environmentally friendly materials. The flexible material is prepared without foaming, which simplifies the production process of impact-resistant materials and further solves the problem of poor base adhesion when preparing impact-resistant tapes by reducing the roughness. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026]

[0027] Example 1

[0028] Step 1: Weigh 3g of sodium dodecylbenzenesulfonate, add 200g of deionized water, 0.2g of potassium phosphate, and 0.5g of potassium chloride, and stir in a 60°C water bath to dissolve to obtain a dissolved emulsifier solution. Cool the dissolved emulsifier solution to 19°C and add it to a three-necked flask, stirring at a speed of 100rpm; separately weigh 2g of a 10% aqueous solution of sodium formaldehyde sulfoxylate and 4g of a 1% aqueous solution of sodium EDTA iron salt, and add them to the three-necked flask; take 50 g of di-n-butyl itaconate and 50 g of isoprene are mixed evenly and added to a three-necked flask. The three-necked flask is sealed, the rotation speed is set to 300 rpm, and pre-emulsification is performed for 1 hour. 0.07 g of 70% tert-butyl hydroperoxide solution is dissolved in 1 g of toluene and added to the three-necked flask. Nitrogen is blown for 60 seconds, the flask is sealed, polymerization is initiated, and the reaction is performed for 12 hours to obtain a bio-itaconate elastomer latex, which is demulsified and dried to obtain a bio-based itaconate rubber.

[0029] Step 2: Take 100g of bio-based itaconate rubber and 350g of toluene, protect with nitrogen, heat to 40°C, and stir for 1.5h until the rubber dissolves; continue to heat to 85°C, add 25g of bio-based isobornyl methacrylate, 8g of bio-based tridecyl methacrylate and 1.8g of allyl glycidyl ether, stir for 1h, add 0.16g of dibenzoyl peroxide initiator and continue to react for 4h to obtain a mixture; add 1g of antioxidant 1010 to 10g of toluene, stir for 10min, add it to the mixture and then cool to 30°C, discharge the material to obtain a modified bio-based itaconate rubber solution.

[0030] Step 3: Add 1g of black color paste to 100g of modified bio-based itaconate rubber solution, stir for 20min, add 1.5g of isocyanate curing agent, stir for 15min to obtain glue, apply 100um glue on 50um transparent PET release film using a doctor blade coater, dry, and set the oven temperature gradient to 50℃, 60, 85, 100℃, 110℃, and 95℃. The time for each temperature gradient is 3min to obtain a flexible material.

[0031] Example 2

[0032] Step 1: Weigh 3g of sodium dodecylbenzenesulfonate, add 200g of deionized water, 0.2g of potassium phosphate, and 0.5g of potassium chloride, and stir in a 60°C water bath to dissolve to obtain a dissolved emulsifier solution. Cool the dissolved emulsifier solution to 19°C and add it to a three-necked flask, stirring at a speed of 100rpm; separately weigh 2g of a 10% aqueous solution of sodium formaldehyde sulfoxylate and 4g of a 1% aqueous solution of sodium EDTA iron salt, and add them to the three-necked flask; take 50 g of di-n-butyl itaconate and 50 g of isoprene are mixed evenly and added to a three-necked flask. The three-necked flask is sealed, the rotation speed is set to 300 rpm, and pre-emulsification is performed for 1 hour. 0.07 g of 70% tert-butyl hydroperoxide solution is dissolved in 1 g of toluene and added to the three-necked flask. Nitrogen is blown for 60 seconds, the flask is sealed, polymerization is initiated, and the reaction is performed for 12 hours to obtain a bio-itaconate elastomer latex, which is demulsified and dried to obtain a bio-based itaconate rubber.

[0033] Step 2: Take 100g of bio-based itaconate rubber and 350g of toluene, protect with nitrogen, heat to 40°C, and stir for 1.5h until the rubber dissolves; continue to heat to 85°C, add 30g of bio-based isobornyl methacrylate, 5g of bio-based tridecyl methacrylate and 1.8g of allyl glycidyl ether, stir for 1h, add 0.16g of dibenzoyl peroxide initiator and continue to react for 4h to obtain a mixture; add 1g of antioxidant 1010 to 10g of toluene, stir for 10min, add it to the mixture and then cool to 30°C, discharge the material to obtain a modified bio-based itaconate rubber solution.

[0034] Step 3: Add 1g of black color paste to 100g of modified bio-based itaconate rubber solution, stir for 20min, add 1.5g of isocyanate curing agent, stir for 15min to obtain glue, apply 100um glue on 50um transparent PET release film using a doctor blade coater, dry, and set the oven temperature gradient to 50℃, 60, 85, 100℃, 110℃, and 95℃. The time for each temperature gradient is 3min to obtain a flexible material.

[0035] Example 3

[0036] Step 1: Weigh 3g of sodium dodecylbenzenesulfonate, add 200g of deionized water, 0.2g of potassium phosphate, and 0.5g of potassium chloride, and stir in a 60°C water bath to dissolve to obtain a dissolved emulsifier solution. Cool the dissolved emulsifier solution to 19°C and add it to a three-necked flask, stirring at a speed of 100rpm; separately weigh 2g of a 10% aqueous solution of sodium formaldehyde sulfoxylate and 4g of a 1% aqueous solution of sodium EDTA iron salt, and add them to the three-necked flask; take 50 g of di-n-butyl itaconate and 50 g of isoprene are mixed evenly and added into a three-necked flask. The three-necked flask is sealed, the rotation speed is set to 300 rpm, and pre-emulsification is performed for 1 hour. 0.07 g of 70% tert-butyl hydroperoxide solution is dissolved in 1 g of toluene and added into the three-necked flask. Nitrogen is blown for 60 seconds, the flask is sealed, polymerization is initiated, and the reaction is performed for 12 hours to obtain bio-itaconate elastomer latex, which is demulsified and dried to obtain bio-based itaconate rubber.

[0037] Step 2: Take 100g of bio-based itaconate rubber and 350g of toluene, protect with nitrogen, heat to 40°C, and stir for 1.5h until the rubber dissolves; continue to heat to 85°C, add 30g of bio-based isobornyl methacrylate, 8g of bio-based heptadecanyl methacrylate and 1.8g of allyl glycidyl ether, stir for 1h, add 0.16g of dibenzoyl peroxide initiator and continue to react for 4.5h to obtain a mixture; add 1g of antioxidant 1010 to 10g of toluene, stir for 10min, add it to the mixture and then cool to 30°C, discharge the material to obtain a modified bio-based itaconate rubber solution.

[0038] Step 3: Add 1g of black color paste to 100g of modified bio-based itaconate rubber solution, stir for 20min, add 1.5g of isocyanate curing agent, stir for 15min to obtain glue, apply 100um glue on 50um transparent PET release film using a doctor blade coater, dry, and set the oven temperature gradient to 50℃, 60, 85, 100℃, 110℃, and 95℃. The time for each temperature gradient is 3min to obtain a flexible material.

[0039] Comparative Example 1

[0040] Step 1: Weigh 3g of sodium dodecylbenzenesulfonate, add 200g of deionized water, 0.2g of potassium phosphate, and 0.5g of potassium chloride, and stir in a 60°C water bath to dissolve to obtain a dissolved emulsifier solution. Cool the dissolved emulsifier solution to 19°C and add it to a three-necked flask, stirring at a speed of 100rpm; separately weigh 2g of a 10% aqueous solution of sodium formaldehyde sulfoxylate and 4g of a 1% aqueous solution of sodium EDTA iron salt, and add them to the three-necked flask; take 50 g of di-n-butyl itaconate and 50 g of isoprene are mixed evenly and added to a three-necked flask. The three-necked flask is sealed, the rotation speed is set to 300 rpm, and pre-emulsification is performed for 1 hour. 0.07 g of 70% tert-butyl hydroperoxide solution is dissolved in 1 g of toluene and added to the three-necked flask. Nitrogen is blown for 60 seconds, the flask is sealed, polymerization is initiated, and the reaction is performed for 12 hours to obtain a bio-itaconate elastomer latex, which is demulsified and dried to obtain a bio-based itaconate rubber.

[0041] Step 2: Dissolve 20g of bio-based itaconate rubber in 80g of toluene until it is completely dissolved to obtain 100g of bio-based itaconate rubber solution, add 1g of black color paste to the bio-based itaconate rubber solution, stir for 20min, add 1.5g of isocyanate curing agent, stir for 15min to obtain glue, apply 100um glue on a 50um transparent PET release film using a doctor blade coater, and dry it. The oven temperature gradient is set to 50℃, 60, 85, 100℃, 110℃, and 95℃, and the time for each temperature gradient is 3min to obtain a flexible material.

[0042] Comparative Example 2

[0043] Step 1: Weigh 3g of sodium dodecylbenzenesulfonate, add 200g of deionized water, 0.2g of potassium phosphate, and 0.5g of potassium chloride, and stir in a 60°C water bath to dissolve to obtain a dissolved emulsifier solution. Cool the dissolved emulsifier solution to 19°C and add it to a three-necked flask, stirring at a speed of 100rpm; separately weigh 2g of a 10% aqueous solution of sodium formaldehyde sulfoxylate and 4g of a 1% aqueous solution of sodium EDTA iron salt, and add them to the three-necked flask; take 50 g of di-n-butyl itaconate and 50 g of isoprene are mixed evenly and added into a three-necked flask. The three-necked flask is sealed, the rotation speed is set to 300 rpm, and pre-emulsification is performed for 1 hour. 0.07 g of 70% tert-butyl hydroperoxide solution is dissolved in 1 g of toluene and added into the three-necked flask. Nitrogen is blown for 60 seconds, the flask is sealed, polymerization is initiated, and the reaction is performed for 12 hours to obtain bio-itaconate elastomer latex, which is demulsified and dried to obtain bio-based itaconate rubber.

[0044] Step 2: Take 100g of bio-based itaconate rubber and 350g of toluene, protect with nitrogen, heat to 40°C, and stir for 1.5h until the rubber dissolves; continue to heat to 85°C, add 25g of bio-based isobornyl methacrylate, 8g of bio-based tridecyl methacrylate and 1.8g of acrylic acid, stir for 1h, add 0.16g of dibenzoyl peroxide initiator and continue to react for 4h to obtain a mixture; add 1g of antioxidant to 10g of toluene, stir for 10min, add it to the mixture and then cool to 30°C, discharge the material to obtain a modified bio-based itaconate rubber solution.

[0045] Step 3: Add 1g of black color paste to 100g of modified bio-based itaconate rubber solution, stir for 20min, add 1.5g of isocyanate curing agent, stir for 15min to obtain glue solution, and use a doctor blade coater to coat 100um dry glue on a 50um transparent PET release film. The oven temperature gradient is set to 50℃, 60, 85, 100℃, 110℃, and 95℃, and the time for each temperature gradient is 3min to obtain a flexible material.

[0046] experiment

[0047] Take the flexible materials prepared in Examples 1 to 3 and Comparative Examples 1 to 2,

[0048] 22 g of ethyl ester was added to 100 g of acrylate adhesive and stirred for 20 minutes. Then, 1 g of black color paste was added to the above mixture and stirred for 20 minutes. Finally, 4 g of isocyanate curing agent was added and stirred for 20 minutes. After mixing evenly, 50 μm of dry glue was applied with a 50 μm transparent PET release film using a knife coater. The curing conditions were: 110°C / 3 min, and the adhesive was attached to the air side of the flexible material. 50 μm of dry glue was applied with a 20 μm transparent PET release film using a knife coater. The curing conditions were: 110°C / 3 min, and the adhesive was attached to the non-air side of the flexible material to obtain an impact-resistant tape.

[0049] Conduct performance tests on flexible materials and impact-resistant tapes.

[0050] Cut the flexible material into a 30mm x 30mm square and fit it to the center of the point-surface impact sensor. Open the point-surface impact test software, click "Auto Test," and drop a 7g stainless steel ball from a height of 10cm to the center of the material. Record the test results and perform the point impact test.

[0051] Cut the flexible material into a 30mm×30mm square and attach it to the center of a 14cm×7cm×0.7mm glass plate. Center the glass plate upward and attach it to the point-surface impact sensor. Open the point-surface impact test software and click "Auto Test." Drop a 14g stainless steel ball from a height of 30cm to the center of the glass plate to test for surface impact.

[0052] The double-sided tape was die-cut into 2mm wide paper-shaped samples, and the two sides were respectively attached to a square SUS plate with a side length of 24.5mm and a square SUS frame with an inner side length of 20.5mm and an outer side length of 40mm. The tensile testing machine was selected to select the "constant pressure 215N" mode and pressed at 62N. After pressing, the sample was left to stand in an environment of 23℃ and 50% RH for 2 days. Then, stainless steel balls of different weights were used to vertically impact the sample at a height of 1m. The ball number that destroyed the sample was recorded, and the DuPont impact test was performed.

[0053] The double-sided tape was die-cut into 10mm×10mm squares, and the two sides were respectively attached to SUS plates with sides of 24.5mm and 10mm. The SUS plate with a side length of 10mm was placed in the center. The tensile testing machine selected the "constant pressure 215N" mode and pressed at 35N. After pressing, the sample was left to stand in an environment of 23℃ and 50%RH for 2 days, and then tested for pendulum impact using a pendulum impact testing machine.

[0054] The obtained data is shown in the following table:

[0055]

[0056] Conclusion: From the comparison of the data in the above table, it can be seen that in Comparative Example 1, the bio-based itaconate rubber is not modified, and the point and surface impact of the flexible material are both low, and the impact resistance is poor. At this time, the impact-resistant tape cannot well release external force impact. Comparative Example 2 does not use allyl glycidyl ether as a functional monomer, resulting in slightly poor base adhesion, and therefore the impact resistance of the impact-resistant tape is also slightly poor. However, the allyl glycidyl ether functional monomer used in the embodiment can further react with the acrylic adhesive on both sides, and the -O- in the functional monomer can form hydrogen bonds with the molecules in the acrylic adhesive, solving the problem of poor base adhesion when preparing the impact-resistant tape, and the modified tape has good impact resistance.

[0057] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing a modified bio-based itaconate rubber solution, characterized in that: The following steps are involved: Take bio-based itaconate rubber and solvent, pass nitrogen protection, heat to 38-42℃, and stir for 1-2h until the rubber is dissolved; Continue to raise the temperature to 83-86°C, add the bio-based monomer and the functional monomer, stir for 1-1.2 hours, add the initiator and continue the reaction for 3-4.5 hours to obtain a mixture; dissolve the antioxidant in a solvent and add it to the mixture and stir for 10-15 minutes, cool to 30-35°C, discharge the material, and obtain a modified bio-based itaconate rubber solution; The bio-based carbon content of the bio-based monomer is 70%-100%; the bio-based monomer is any one or more of bio-based isodecyl methacrylate, bio-based isobornyl methacrylate, bio-based isobornyl acrylate, bio-based tridecyl methacrylate, bio-based heptadecanyl methacrylate, and bio-based octadecyl methacrylate.

2. The method for preparing a modified bio-based itaconate rubber solution according to claim 1, characterized in that: The modified bio-based itaconate rubber solution includes the following components: by weight, 80-120 parts of bio-based itaconate rubber, 15-55 parts of bio-based monomer, 0.1-3 parts of functional monomer, 0.1-0.3 parts of initiator, 1-3 parts of antioxidant, and 300-450 parts of solvent.

3. The method for preparing a modified bio-based itaconate rubber solution according to claim 1, wherein: The functional monomer is allyl glycidyl ether.

4. The method for preparing a modified bio-based itaconate rubber solution according to claim 1, wherein: The initiator is any one or more of dibenzoyl peroxide, azobisisobutyronitrile, azobisisobutyramidine hydrochloride, azoisobutylcyanamide, di-tert-butyl peroxide, dodecyl peroxide, tert-butyl peroxyvalerate, diisopropyl peroxydicarbonate, and cumene hydroperoxide; the antioxidant is any one or more of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant 164, antioxidant CA, antioxidant DNP, antioxidant DLTP, antioxidant TNP, and antioxidant TPP; and the solvent is any one or more of n-butyl acetate, sec-butyl acetate, n-amyl acetate, sec-amyl acetate, toluene, xylene, butanone, acetone, cyclohexanone, N,N-dimethylformamide, dimethyl sulfoxide, carbon tetrachloride, and tetrahydrofuran.

5. The method for preparing a modified bio-based itaconate rubber solution according to claim 1, wherein: The preparation method of the bio-based itaconate rubber comprises the following steps: Step 1: Take sodium dodecylbenzenesulfonate, add deionized water, potassium phosphate, and potassium chloride, and stir to dissolve in a 58-62°C water bath to obtain a dissolved emulsifier solution; cool the dissolved emulsifier solution to below 20°C and add it to the flask; Step 2: Add sodium formaldehyde sulfoxylate aqueous solution and EDTA sodium iron salt aqueous solution; Step 3: Take di-n-butyl itaconate and isoprene, mix them evenly, add them to the above flask, seal it, and pre-emulsify for 0.5-1.5 hours; Step 4: Dissolve tert-butyl hydroperoxide solution in toluene, add the solution to the above flask, blow nitrogen for 55-65 seconds, seal, initiate polymerization, react for 11-13 hours to obtain bio-itaconate elastomer latex, demulsify and dry to obtain bio-based itaconate rubber.

6. A method for preparing a flexible material, characterized in that: The following steps are involved: Add black color paste to the modified bio-based itaconate rubber solution according to any one of claims 1 to 5, stir for 20 to 25 minutes, add curing agent, stir for 10 to 15 minutes to obtain glue solution, apply the glue solution on a PET release film, and dry to obtain a flexible material.

7. The method for preparing a flexible material according to claim 6, wherein: The flexible material comprises the following components: by weight, 80-150 parts of modified bio-based itaconate rubber solution, 1-3 parts of black color paste, and 0.5-5 parts of curing agent.

8. The method for preparing a flexible material according to claim 7, characterized in that: The curing agent is any one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

Images