Highly compatible tpe composite, eraser and method for preparing the same

Abstract

This invention discloses a highly compatible TPE composite material, an eraser, and its preparation method, belonging to the field of eraser technology. First, a chain extender containing dynamic imine bonds is synthesized from p-aminophenol and vanillin, introducing dynamic bond units with dual thermal-shear response characteristics. This is then reacted with hydroxyl-terminated polybutadiene and isoflurane diisocyanate to prepare a modified polyurethane elastomer compatibilizer. High compatibility is achieved by utilizing the oleophilicity of the soft segments, and an energy dissipation network is constructed using the dynamic bonds of the hard segments. Subsequently, SEBS, white oil, polypropylene, and highly filled fillers are melt-extruded with the modified polyurethane elastomer compatibilizer to obtain a highly compatible TPE composite material. Finally, the highly compatible TPE composite material is injection molded to obtain an eraser. Through the synergistic mechanism of the shaped dynamic network, the eraser maintains high structural integrity under strong friction conditions, thereby achieving a highly efficient debris aggregation effect.

Description

Technical Field

[0001] This invention belongs to the field of eraser technology, specifically high compatibility TPE composite material, eraser and its preparation method. Background Technology

[0002] Erasers are essential cleaning stationery in daily study and office work. Their core function is to remove graphite or ink marks on paper through physical friction. Traditional polyvinyl chloride erasers contain phthalate plasticizers, which are prone to plasticizer migration and potential health risks. They are gradually being phased out of the market and replaced by SEBS (styrene-ethylene-butene-styrene) thermoplastic elastomer materials, which are safer, more environmentally friendly, and have a superior feel.

[0003] Most existing SEBS composite material systems are based on simple physical blending. The matrix and highly filled inorganic particles are connected only by weak van der Waals forces or mechanical interlocking. This fragile interfacial bond cannot effectively transfer stress, resulting in insufficient cohesive strength and tear resistance within the material. When subjected to high-intensity shearing during wiping, the interfacial bond of the matrix is ​​prone to failure. This causes the abrasion debris generated by the eraser to fly around in fine, loose powder. This fine powder is not only difficult to remove completely from the paper, but also easily adheres to skin, clothing, and desktop crevices, causing cleaning problems.

[0004] Therefore, how to achieve high compatibility between multiple components within SEBS composite materials and construct a strong and dynamic interfacial bonding network, thereby endowing eraser products with the ability to maintain cohesive stability under intense reciprocating friction conditions, and effectively overcoming brittle fragmentation and powdering caused by interfacial defects to achieve excellent chip collection performance, has become a core technical problem that urgently needs to be solved in the field of modern high-performance erasers. Summary of the Invention

[0005] The purpose of this invention is to provide a highly compatible TPE composite material, an eraser, and a method for preparing the same. By preparing a modified polyurethane compatibilizer containing dynamic imine hard segments and oleophilic soft segments, a dynamic interfacial reinforcement network with "soft and hard synergy" is constructed between the TPE / SEBS matrix and the highly filled filler. This effectively overcomes the defects of traditional highly filled eraser materials, such as low cohesive strength and easy brittleness and flaking, caused by insufficient interfacial bonding.

[0006] The objective of this invention can be achieved through the following technical solutions: The highly compatible TPE composite material, by weight, comprises the following raw materials: SEBS 200-400 parts, white oil 300-600 parts, modified polyurethane elastomer compatibilizer 20-40 parts, polypropylene 30-60 parts, silica 30-60 parts, calcium carbonate 400-800 parts, antioxidant 1010 1-3 parts.

[0007] This invention also provides a method for preparing a highly compatible TPE composite material, comprising the following steps: SEBS and white oil were placed in a high-speed mixer and stirred at 25-35℃ for 20-40 minutes. Modified polyurethane elastomer compatibilizer, polypropylene, silica, calcium carbonate and antioxidant 1010 were added and stirred at the same temperature for 20-40 minutes. The mixed material was placed in a twin-screw extruder and extruded and granulated to obtain a highly compatible TPE composite material.

[0008] Furthermore, the twin-screw extruder has processing temperatures of 130-140℃, 150-160℃, and 160-170℃, and a rotation speed of 100-200 r / min.

[0009] Furthermore, the preparation process of the modified polyurethane elastomer compatibilizer is as follows: Hydroxyl-terminated polybutadiene and tetrahydrofuran were placed in a reaction vessel and stirred at 25-35℃ for 10-20 min. Isoflurane diisocyanate and dibutyltin dilaurate were added, and the mixture was reacted at 50-60℃ for 2-4 h. The temperature was then raised to 60-70℃, and a solution containing a dynamic imine bond chain extender was added. The reaction was continued for 2-4 h. The reaction solution was poured into a tray and placed in a fume hood to evaporate the solvent for 20-24 h. The mixture was then vacuum dried to constant weight and sheared and pulverized to obtain a modified polyurethane elastomer compatibilizer.

[0010] Furthermore, the ratio of the amount of hydroxyl-terminated polybutadiene, tetrahydrofuran, isoflurane diisocyanate, dibutyltin dilaurate, and the solution containing dynamic imine bond chain extender is 80-120g: 250-350mL: 15-25g: 0.1-0.3g: 40-60g.

[0011] Furthermore, the solution containing the dynamic imine bond chain extender is obtained by mixing the dynamic imine bond chain extender and tetrahydrofuran at a mass ratio of 1:3.

[0012] Furthermore, the preparation process of the chain extender containing dynamic imine bonds is as follows: Para-aminophenol and anhydrous ethanol were placed in a reaction vessel under nitrogen atmosphere and stirred at 25-35℃ for 10-20 min. A 0.3 mol / L vanillin aqueous solution was added, and the reaction was carried out at 50-60℃ for 2-4 h. The mixture was filtered, washed, and vacuum dried to constant weight to obtain a chain extender containing dynamic imine bonds.

[0013] Furthermore, the ratio of the amount of aminophenol, anhydrous ethanol, and vanillin aqueous solution is 10-20g: 100-200mL: 300-600mL.

[0014] The present invention also provides a method for preparing an eraser, comprising the following steps: The high-compatibility TPE composite material is dried at 60-70℃ for 2-4 hours. The dried material is placed in an injection molding machine and plasticized and melted. The melt is injected into the eraser mold cavity under an injection pressure of 60-80MPa. The pressure is held at 40-50MPa for 5-10 seconds. After cooling and solidification for 15-20 seconds under the action of mold circulating water, the mold is opened and the eraser is ejected to obtain the eraser.

[0015] Furthermore, the temperatures of each zone of the injection molding machine are 145-155℃, 155-165℃, and 165-175℃, the nozzle temperature is 165-175℃, and the screw speed is 40-60 r / min.

[0016] Furthermore, the plasticizing and melting time is 30-40 seconds.

[0017] The beneficial effects of this invention are: The eraser prepared in this invention utilizes a highly compatible TPE composite material. A modified polyurethane elastomer compatibilizer containing hydroxyl-terminated polybutadiene soft segments and dynamic imine hard segments is introduced into this composite material. This compatibilizer, along with the SEBS matrix, polypropylene, and inorganic fillers, forms a strong and tough interfacial network within a highly filled system. By leveraging the high chemical structural similarity between the hydroxyl-terminated polybutadiene soft segments and the SEBS and white oil in the matrix, the invention effectively solves the problem of easy migration and precipitation of conventional polar compatibilizers in non-polar matrices. Furthermore, it utilizes the "thermal activation" characteristic of the dynamic imine bonds in the hard segments during melt processing. By reducing the local melt viscosity through reversible bond exchange reactions, compatibilizer molecules can quickly penetrate into the filler agglomerates to achieve full encapsulation, thus effectively overcoming the filler agglomeration problem caused by interfacial tension differences. After cooling and solidification, these dynamic bonds recombine to form a high-density hydrogen bond network, which acts as "responsive anchors" to firmly lock the uniformly dispersed silica and calcium carbonate in a continuous elastomer network. This significantly improves the cohesive strength and overall uniformity of the composite material, laying a solid structural foundation for the eraser to maintain cohesive stability under reciprocating friction conditions.

[0018] The eraser prepared by this invention utilizes the "sacrificial bond effect" of dynamic chemical bonds in a highly compatible TPE composite material and the synergistic reinforcement of the polypropylene crystalline phase. In wiping applications, it achieves effective energy dissipation and self-adhesion of debris. When the eraser is subjected to high-intensity reciprocating friction on the paper surface, the dynamic imine bonds introduced into the composite material are activated under the dual action of frictional heat and shear force, undergoing a reversible exchange reaction. This process effectively absorbs destructive shear energy. Combined with the supporting effect of the polypropylene crystalline phase, it effectively prevents brittle fracture of the matrix. At the same time, the heat generated by friction keeps the dynamic imine bonds exposed on the surface of the debris in a highly active free state. When the fine powder comes into contact with each other, these active bonds can quickly recombine, giving the detached debris a strong self-adhesive ability. This allows the wiping debris to quickly adhere to each other and curl into strips, thus achieving excellent debris collection performance on a macroscopic scale and solving the cleaning problem of difficult removal of fine powder. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: This example provides a method for preparing a highly compatible TPE composite material, including the following steps: S1: Place 10g of p-aminophenol and 100mL of anhydrous ethanol in a reaction vessel under nitrogen atmosphere protection, stir at 200r / min for 10min at 25℃, add 300mL of 0.3mol / L vanillin aqueous solution, react at 50℃ with the same stirring rate for 2h, after the reaction is completed, cool to room temperature, filter, wash the filter cake twice with deionized water, and vacuum dry at 40℃ to constant weight to obtain a chain extender containing dynamic imine bonds.

[0021] S2: Place 80g of hydroxyl-terminated polybutadiene and 250mL of tetrahydrofuran in a reaction vessel, stir at 200r / min for 10min at 25℃, add 15g of isoflurane diisocyanate and 0.1g of dibutyltin dilaurate, react at 50℃ with the same stirring rate for 2h, raise the temperature to 60℃, add 40g of a dynamic imine bond chain extender solution (obtained by mixing a dynamic imine bond chain extender and tetrahydrofuran at a mass ratio of 1:3), continue to react at the same stirring rate for 2h, after the reaction is completed, pour the reaction solution into a tray, place it in a fume hood to allow the solvent to evaporate naturally for 20h, then transfer it to a vacuum oven and vacuum dry at 60℃ to constant weight to obtain the modified polyurethane elastomer compatibilizer.

[0022] S3: Place 200g SEBS and 300g white oil in a high-speed mixer and stir at 800r / min for 20min at 25℃. Add 20g modified polyurethane elastomer compatibilizer, 30g polypropylene, 30g silica, 400g calcium carbonate and 1g antioxidant 1010. Stir at 300r / min for 20min at the same temperature. Place the mixed material in a twin-screw extruder with processing temperatures of 130℃, 150℃ and 160℃ and a screw speed of 100r / min. Extrude and granulate to obtain a highly compatible TPE composite material.

[0023] Example 2: This example provides a method for preparing a highly compatible TPE composite material, including the following steps: S1: Place 15g of p-aminophenol and 150mL of anhydrous ethanol in a reaction vessel under nitrogen atmosphere protection, stir at 250r / min for 15min at 30℃, add 450mL of 0.3mol / L vanillin aqueous solution, react at 55℃ with the same stirring rate for 3h, after the reaction is completed, cool to room temperature, filter, wash the filter cake three times with deionized water, and vacuum dry at 50℃ to constant weight to obtain a chain extender containing dynamic imine bonds.

[0024] S2: Place 100g of hydroxyl-terminated polybutadiene and 300mL of tetrahydrofuran in a reaction vessel, stir at 250r / min for 15min at 30℃, add 20g of isoflurane diisocyanate and 0.2g of dibutyltin dilaurate, react at 55℃ with the same stirring rate for 3h, raise the temperature to 65℃, add 50g of a solution containing dynamic imine bond chain extender, and continue to react at the same stirring rate for 3h. After the reaction is completed, pour the reaction solution into a tray, place it in a fume hood to allow the solvent to evaporate naturally for 22h, and then transfer it to a vacuum oven and vacuum dry at 70℃ to constant weight to obtain the modified polyurethane elastomer compatibilizer.

[0025] S3: Place 300g SEBS and 450g white oil in a high-speed mixer and stir at 900r / min for 30min at 30℃. Add 30g modified polyurethane elastomer compatibilizer, 45g polypropylene, 45g silica, 600g calcium carbonate and 2g antioxidant 1010. Stir at 400r / min for 30min at the same temperature. Place the mixed material in a twin-screw extruder with processing temperatures of 135℃, 155℃ and 165℃ and a screw speed of 150r / min. Extrude and granulate to obtain a highly compatible TPE composite material.

[0026] Example 3: This example provides a method for preparing a highly compatible TPE composite material, including the following steps: S1: Place 20g of p-aminophenol and 200mL of anhydrous ethanol in a reaction vessel under a nitrogen atmosphere, stir at 300r / min for 20min at 35℃, add 600mL of 0.3mol / L vanillin aqueous solution, react at 60℃ with the same stirring rate for 4h, cool to room temperature after the reaction is completed, filter, wash the filter cake 4 times with deionized water, and vacuum dry at 60℃ to constant weight to obtain a chain extender containing dynamic imine bonds.

[0027] S2: 120g of hydroxyl-terminated polybutadiene and 350mL of tetrahydrofuran were placed in a reaction vessel and stirred at 300r / min for 20min at 35℃. 25g of isoflurane diisocyanate and 0.3g of dibutyltin dilaurate were added, and the mixture was reacted at 60℃ with the same stirring rate for 4h. The temperature was then raised to 70℃, and 60g of a solution containing dynamic imine bond chain extender was added. The mixture was stirred at the same stirring rate for another 4h. After the reaction was completed, the reaction solution was poured into a tray and placed in a fume hood to allow the solvent to evaporate naturally for 24h. Then, it was transferred to a vacuum oven and vacuum dried at 80℃ to constant weight to obtain the modified polyurethane elastomer compatibilizer.

[0028] S3: Place 400g SEBS and 600g white oil in a high-speed mixer and stir at 1000r / min for 20-40min at 35℃. Add 40g modified polyurethane elastomer compatibilizer, 60g polypropylene, 60g silica, 800g calcium carbonate and 3g antioxidant 1010. Stir at 500r / min for 40min at the same temperature. Place the mixed material in a twin-screw extruder with processing temperatures of 140℃, 160℃ and 170℃ and a screw speed of 200r / min. Extrude and granulate to obtain a highly compatible TPE composite material.

[0029] The highly compatible TPE composite materials prepared in Examples 1-3 above are first obtained by reacting p-aminophenol and vanillin in an ethanol / water system via a Schiff base condensation reaction. The nucleophilic addition-elimination of the amino group with the aldehyde group leads to the formation of a dynamically reversible imine bond (-C=N-), while retaining highly active phenolic hydroxyl sites at both ends of the product, thus yielding a chain extender containing dynamic imine bonds. Subsequently, hydroxyl-terminated polybutadiene is introduced as the soft segment of the polyurethane. Its hydroxyl groups prepolymerize with the isocyanate groups (-NCO) in isoflurane diisocyanate to generate a prepolymer with terminal -NCO groups. Based on this, a chain extender containing dynamic imine bonds is added, utilizing its phenolic hydroxyl groups to react with the -NCO groups at the ends of the prepolymer. The group undergoes an addition polymerization reaction to generate urethane bonds (-NHCOO-) and implants dynamic imine bonds into the hard segment structure of polyurethane, thus preparing a modified polyurethane elastomer compatibilizer that combines oleophilic soft segments and dynamic functional hard segments. Finally, when this compatibilizer is compounded with SEBS matrix, polypropylene and inorganic fillers (fumed silica, calcium carbonate) in a melt blend system, the hydroxyl-terminated polybutadiene soft segments in the compatibilizer physically entangle and co-dissolve with the SEBS matrix according to the principle of similar compatibility, while the urethane bonds and dynamic imine bonds on its polar hard segments are tightly adsorbed on the surface of inorganic fillers through hydrogen bonds and van der Waals forces. The synergistic effect of multiple components yields a highly compatible TPE composite material.

[0030] Example 4: This example provides a method for preparing an eraser, including the following steps: 500g of the highly compatible TPE composite material prepared in Example 1 was dried at 60°C for 2 hours. The dried material was placed in an injection molding machine. The temperatures of each zone of the injection molding machine barrel were set to 145°C, 155°C, and 165°C, the nozzle temperature was set to 165°C, and the screw speed was set to 40 r / min. After plasticizing and melting for 30 seconds, the melt was injected into the eraser mold cavity under an injection pressure of 60 MPa. The mold was held at a holding pressure of 40 MPa for 5 seconds. After cooling and solidification under the action of circulating water, the mold was opened and the eraser was ejected to obtain the eraser.

[0031] Example 5: This example provides a method for preparing an eraser, including the following steps: 600g of the highly compatible TPE composite material prepared in Example 2 was dried at 65°C for 3 hours. The dried material was placed in an injection molding machine. The temperatures of each zone of the injection molding machine barrel were set to 150°C, 160°C, and 170°C, the nozzle temperature was set to 170°C, and the screw speed was set to 50 r / min. After plasticizing and melting for 35 seconds, the melt was injected into the eraser mold cavity under an injection pressure of 70 MPa. The mold was held at a holding pressure of 45 MPa for 8 seconds. After cooling and solidification under the action of circulating water in the mold, the mold was opened and the eraser was ejected to obtain the eraser.

[0032] Example 6: This example provides a method for preparing an eraser, including the following steps: 700g of the highly compatible TPE composite material prepared in Example 3 was dried at 70°C for 4 hours. The dried material was placed in an injection molding machine. The temperatures of each zone of the injection molding machine barrel were set to 155°C, 165°C, and 175°C, the nozzle temperature was set to 175°C, and the screw speed was set to 60 r / min. After plasticizing and melting for 40 seconds, the melt was injected into the eraser mold cavity under an injection pressure of 80 MPa. The mold was held at a holding pressure of 50 MPa for 10 seconds. After cooling and solidification under the action of circulating water in the mold, the mold was opened and the eraser was ejected to obtain the eraser.

[0033] Comparative Example 1: The difference from Example 2 is that a commercially available chain extender was used instead of the chain extender containing dynamic imine bonds prepared in step S1, while the other steps remained unchanged. A composite material was prepared, and then, based on Example 5, this composite material was used to replace the highly compatible TPE composite material prepared in Example 2 to prepare an eraser.

[0034] Comparative Example 2: The difference from Example 2 is that a commercially available compatibilizer was used instead of the modified polyurethane elastomer compatibilizer prepared in step S2, while the other steps remained unchanged, and a composite material was prepared. Then, based on Example 5, this composite material was used to replace the highly compatible TPE composite material prepared in Example 2 to prepare an eraser.

[0035] Comparative Example 3: The difference from Example 2 is that the modified polyurethane elastomer compatibilizer prepared in step S2 is removed, while the other steps remain unchanged, and a composite material is prepared. Then, based on Example 5, an eraser is prepared.

[0036] The hydroxyl-terminated polybutadiene purchased in the above examples and comparative examples was produced by Meite New Materials Co., Ltd., with CAS number 69102-90-5, hydroxyl value of 0.85-0.95 mmol / g, and molecular weight of 2000-3000 g / mol; SEBS was produced by Sinopec Baling Petrochemical Company, and is a styrene-ethylene-butene-styrene block copolymer, model YH-503T, with a styrene mass fraction of 33%; polypropylene was produced by China National Petroleum Corporation, with a melt flow rate of 15-25 g / 10 min, and is homopolymer polypropylene.

[0037] The erasers prepared in Examples 4-6 and Comparative Examples 1-3 were subjected to performance tests, and the test results are shown in Table 1: Sample preparation: The erasers prepared in the above examples and comparative examples were cut into standard dumbbell-shaped tensile specimens for mechanical property testing, and into rectangular blocks for letter erasure testing. The rectangular blocks were 20mm×10mm×5mm in size. The surface of the specimens was polished smooth before performance testing.

[0038] Mechanical properties: Referring to standard GB / T 528-2009, dumbbell-shaped specimens were placed on a universal testing machine for tensile testing. The tensile speed was set to 500 mm / min until the specimen broke. The tensile strength and elongation at break of the material were recorded. The higher the tensile strength, the higher the cohesive strength and interfacial bonding force of the material. During the wiping process, the eraser structure can be well maintained. The higher the elongation at break, the better the flexibility of the material, which can effectively avoid brittle flaking during reciprocating friction.

[0039] Erasure performance: Referring to standard QB / T 2309-2010, a rectangular sample block was installed on an automatic erasing machine. A standard HB pencil was used to prepare a uniform color block on writing paper. The vertical load was set to 5N and the erasing frequency was 60 times / min. The paper was erased back and forth. The optical density value of the paper surface before and after erasing was measured using a reflectance densitometer. The erasure rate was calculated. The higher the erasure rate, the better the erasure performance of the eraser.

[0040] Eraser debris collection performance: Collect the eraser debris generated by each sample during the above eraser performance test, and record the mass of the debris as m0. Then, place all the debris on a 20-mesh standard sieve and perform slight horizontal shaking sieving for 30 seconds. Weigh the debris that does not pass through the sieve and record it as m1. Each group of samples was tested in parallel 3 times, and the average value was taken. The debris collection rate was calculated according to the following formula: Debris collection rate (%) = (m1 / m0) × 100%. The higher the debris collection rate, the better the debris clumping ability and the easier it is to clean.

[0041] Table 1. Eraser Performance Test Table project Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Tensile strength (MPa) 6.8 7.2 6.9 4.5 3.2 1.8 Elongation at break (%) 680 720 695 450 320 150 Character elimination rate (%) 95.2 96.5 95.8 91.0 84.5 76.2 Chip collection rate (%) 94.5 97.8 95.2 62.5 35.8 8.5 As shown in Table 1, the erasers prepared in Examples 4-6 exhibit superior performance compared to Comparative Examples 1-3. This demonstrates that the modified polyurethane elastomer compatibilizer, constructed by introducing hard segments containing dynamic imine bonds and soft segments of oleophilic end-hydroxyl polybutadiene, creates a significant interfacial synergistic reinforcement effect between the matrix and the highly filled filler within the highly compatible TPE composite material system constituting the eraser. This results in a composite material with higher cohesive strength and interfacial bonding force. Furthermore, based on the dual activation mechanism of dynamic imine bonds under frictional heat and shear force, it plays a crucial role in energy dissipation and self-adhesion of debris during eraser use. This significantly improves the structural integrity and flexibility of the eraser, enabling it to effectively overcome brittle fragmentation and achieve automatic debris roll-up, greatly increasing the debris collection rate and giving the eraser excellent wiping cleanliness and user experience.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A highly compatible TPE composite material, characterized in that, By weight, it includes the following raw materials: SEBS 200-400 parts, white oil 300-600 parts, modified polyurethane elastomer compatibilizer 20-40 parts, polypropylene 30-60 parts, silica 30-60 parts, calcium carbonate 400-800 parts, antioxidant 1010 1-3 parts; The modified polyurethane elastomer compatibilizer is prepared through the following steps: Hydroxyl-terminated polybutadiene and tetrahydrofuran were placed in a reaction vessel and stirred at 25-35℃ for 10-20 min. Isoflurane diisocyanate and dibutyltin dilaurate were added, and the mixture was reacted at 50-60℃ for 2-4 h. The temperature was then raised to 60-70℃, and a solution containing a dynamic imine bond chain extender was added. The reaction was continued for 2-4 h. The reaction solution was poured into a tray and placed in a fume hood to evaporate the solvent for 20-24 h. The mixture was then vacuum dried to constant weight and sheared and pulverized to obtain a modified polyurethane elastomer compatibilizer.

2. The highly compatible TPE composite material according to claim 1, characterized in that, The ratio of the amount of hydroxyl-terminated polybutadiene, tetrahydrofuran, isoflurane diisocyanate, dibutyltin dilaurate, and the solution containing dynamic imine bond chain extender is 80-120g: 250-350mL: 15-25g: 0.1-0.3g: 40-60g; The solution containing the dynamic imine bond chain extender is obtained by mixing the dynamic imine bond chain extender and tetrahydrofuran at a mass ratio of 1:

3.

3. The highly compatible TPE composite material according to claim 2, characterized in that, The chain extender containing dynamic imine bonds is prepared through the following steps: Para-aminophenol and anhydrous ethanol were placed in a reaction vessel under nitrogen atmosphere and stirred at 25-35℃ for 10-20 min. A 0.3 mol / L vanillin aqueous solution was added, and the reaction was carried out at 50-60℃ for 2-4 h. The mixture was filtered, washed, and vacuum dried to constant weight to obtain a chain extender containing dynamic imine bonds.

4. The highly compatible TPE composite material according to claim 3, characterized in that, The ratio of the amount of p-aminophenol, anhydrous ethanol, and vanillin aqueous solution is 10-20g: 100-200mL: 300-600mL.

5. The highly compatible TPE composite material according to claim 1, characterized in that, Prepared by the following steps: SEBS and white oil were placed in a high-speed mixer and stirred at 25-35℃ for 20-40 minutes. Modified polyurethane elastomer compatibilizer, polypropylene, silica, calcium carbonate and antioxidant 1010 were added and stirred at the same temperature for 20-40 minutes. The mixed material was placed in a twin-screw extruder and extruded and granulated to obtain a highly compatible TPE composite material.

6. The highly compatible TPE composite material according to claim 5, characterized in that, The twin-screw extruder has processing temperatures of 130-140℃, 150-160℃, and 160-170℃, and a rotation speed of 100-200 r / min.

7. A method for preparing an eraser, characterized in that, Includes the following steps: The high-compatibility TPE composite material is dried at 60-80℃ for 2-4 hours. The dried material is placed in an injection molding machine and plasticized and melted. The melt is injected into the rubber eraser mold cavity under an injection pressure of 60-80MPa. The pressure is held at 40-50MPa for 5-10 seconds. After cooling and solidification under the action of circulating water for 15-20 seconds, the mold is opened and the eraser is ejected to obtain the eraser. The highly compatible TPE composite material is the highly compatible TPE composite material according to any one of claims 1-6.

8. The method for preparing an eraser according to claim 7, characterized in that, The temperatures of each zone of the injection molding machine are 145-155℃, 155-165℃, and 165-175℃, the nozzle temperature is 165-175℃, and the screw speed is 40-60 r / min.

9. The method for preparing an eraser according to claim 7, characterized in that, The plasticizing and melting time is 30-40 seconds.

10. An eraser, characterized in that, The eraser is prepared by the method described in any one of claims 7-9.