Light low-friction-resistance TPE eraser material and preparation method thereof

Abstract

The invention discloses a lightweight low-friction-resistance TPE eraser material and a preparation method thereof, and relates to the technical field of stationery materials, the lightweight low-friction-resistance TPE eraser material is prepared from the following raw materials by weight: 100 parts of a styrene block copolymer, 100-200 parts of white oil, 20-80 parts of resin, 10-40 parts of a compatilizer, 50-500 parts of a filler, 50-500 parts of lightweight inorganic powder, 0.1-1 part of an antioxidant, 0.1-1 part of a light stabilizer and 1-5 parts of a slipping agent. According to the invention, TPE is taken as a basic carrier, so that the health risk in the processing and using processes of a traditional PVC material is avoided from the source, and the material is especially suitable for sensitive people such as children to use. Meanwhile, the styrene block copolymer and the white oil system which are scientifically proportioned are matched with the interface modification effect of the compatilizer, so that the inorganic filler and the polymer matrix are uniformly dispersed, the mechanical stability of the material is ensured, and the lightweight characteristic that the specific gravity is less than 1 is realized by introducing the lightweight inorganic powder; the problems that a traditional eraser is large in weight and inconvenient to carry are solved.

Description

Technical Field

[0001] This invention relates to the field of stationery materials technology, and more specifically, to a lightweight, low-friction-resistance TPE eraser material and its preparation method. Background Technology

[0002] Erasers are an indispensable tool in daily stationery. Their main function is to erase the marks left by pencils (graphite or colored pencils) on the surface of paper. The principle of their operation is to remove the marks by using the physical action of friction to peel off the graphite particles or pigments on the surface of the paper.

[0003] Looking at the development history of eraser materials, before the advent of polymer erasers, people typically used breadcrumbs as erasing tools. In 1770, British engineer Edward Naime accidentally used rubber as an eraser and found it to be more effective than breadcrumbs, thus giving birth to the rubber eraser. However, early rubber erasers had significant drawbacks: unprocessed rubber was easily perishable, and the eraser itself was dense and smooth, making it difficult to shed lint when erasing; it only absorbed graphite onto the surface, and repeated rubbing actually made the paper dirtier. In 1839, Charles Goodyear discovered that adding oil, fillers, and other raw materials to rubber, along with sulfur for vulcanization, could significantly improve the quality of the rubber. The resulting eraser was soft and easily shed lint, allowing it to be used for a long time. However, because vulcanized rubber becomes a thermosetting material, the product cannot be recycled, causing environmental pollution. This problem spurred the development of thermoplastic erasers.

[0004] Currently, there are many types of eraser materials on the market, mainly including rubber, PVC (polyvinyl chloride), TPR (thermoplastic rubber), and TPE (thermoplastic elastomer). Among them, erasers made from PVC powder, plasticizers, and fillers do not require vulcanization, have high production efficiency, and are soft in texture. Furthermore, PVC, as a thermoplastic, is recyclable, so the vast majority of erasers are currently made from PVC. However, PVC releases harmful gases during processing, which not only damages production equipment but also harms human health. In addition, the plasticizers and various additives added to PVC materials can have adverse effects on human health with long-term use, and may even cause mild poisoning. Minors, in particular, have weaker immune systems; if the concentration of plasticizers exceeds the standard, it can easily lead to symptoms such as headaches, nausea, and inflammation of the eyes, nose, and throat. To protect consumer health, my country has added phthalate ester compound testing to the "National Toy Safety Technical Specification" (GB6675), with limits largely equivalent to those adopted from the EU's Reach Plasticizer Directive. The revised "General Safety Requirements for School Supplies" (GB21027, draft for comments) also sets requirements for phthalate ester plasticizers in eraser products, specifying limits (DBP+BBP+DEHP≤1g / kg, DNOP+DINP+DIDP≤1g / kg). In the EU, Directive 1999 / 815 / EEC, published in 1999, explicitly states that the content of six plasticizers in polyvinyl chloride (PVC) children's toys and related products intended for use by children under 3 years old must not exceed 0.1%.

[0005] TPR erasers are made from thermoplastic rubber and are currently widely used in the market. TPR erasers are environmentally friendly, non-toxic, and safe, free of phthalic plasticizers (6P, 16P), nonylphenol (NP), and polycyclic aromatic hydrocarbons (PAHs), and comply with environmental standards such as RoHS, REACH (SVHC), and EN71. They have good elasticity and a soft feel, can be processed through extrusion and injection molding, possess good colorability and tactile properties, have excellent processing performance, require no vulcanization, and can be recycled to reduce costs. They are suitable for producing various export-oriented erasers for dolls and toys, cartoon characters, etc., and are particularly suitable for children. However, TPR erasers also have several disadvantages, such as high specific gravity, high hardness, a sticky feel, poor shavings formation, low erasure rate, easy breakage, and easy aging.

[0006] In summary, most erasers on the market today are too heavy, with a specific gravity greater than water. Furthermore, no lightweight eraser material or product with minimal and linear shavings has yet emerged in domestic or international patents or markets. Therefore, developing a lightweight, low-friction eraser material that balances environmental friendliness, smooth erasing, and shavings into linear shapes has become a pressing issue in the stationery materials industry. Summary of the Invention

[0007] To address the problems in related technologies, this invention proposes a lightweight, low-friction-resistance TPE eraser material and its preparation method, thereby overcoming the aforementioned technical problems existing in the prior art.

[0008] The technical solution of this invention is implemented as follows:

[0009] One aspect of the present invention:

[0010] A lightweight, low-friction-resistance TPE eraser material, which is prepared from the following raw materials in parts by weight:

[0011] 100 parts of styrene block copolymer;

[0012] 100-200 parts of white oil;

[0013] 20-80 parts of resin;

[0014] 10-40 parts of compatibilizer;

[0015] 50-500 parts of filler;

[0016] Lightweight inorganic powder, 50-500 parts;

[0017] Antioxidant 0.1 to 1 part;

[0018] 1-5 parts of slip agent;

[0019] The specific details of each raw material are as follows:

[0020] Styrene block copolymers include one or more of SEBS (styrene-ethylene-butene-styrene block copolymer), SEPS (styrene-ethylene-propylene-styrene block copolymer), and SEEPS (styrene-ethylene-ethylene-propylene-styrene block copolymer). Depending on the eraser processing method, styrene block copolymers of different molecular weights can be selected, or a mixture of styrene block copolymers of different molecular weights can be used. Among them, hydrogenated high molecular weight SEBS has good toughness, heat resistance, and aging resistance, making it a preferred material for industries such as daily necessities, stationery, and toys.

[0021] White oil is white mineral oil, which can be made from paraffin oil or naphthenic oil, and its viscosity at 40 degrees Celsius is less than 200 mg / L.2 / s, its main function is to reduce the hardness of materials and improve the processing performance of products. In practical applications, paraffin oils with low viscosity, high flash point, good compatibility, and good resistance to yellowing are preferred. Using such paraffin oils can improve the aging performance and feel of products, while reducing the risk of oil seepage.

[0022] The filler is an inorganic mineral powder or artificially produced inorganic powder, specifically one or more of the following: calcium carbonate, talc, barium sulfate, glass powder, kaolin, diatomaceous earth, and wollastonite, with high-quality calcium carbonate powder being preferred. The particle size of the filler is greater than 400 mesh, preferably 600-1250 mesh. In actual preparation, fillers of different mesh sizes can be mixed to achieve better results.

[0023] The lightweight inorganic powder is selected from one or more of expanded perlite, aerogel powder, hollow glass microspheres, closed-cell ceramic microspheres, and pumice powder. By adding lightweight inorganic powder, the overall density of the eraser material can be significantly reduced, achieving material lightweighting, while also improving the material's mechanical and tribological properties to a certain extent.

[0024] Resins include one or more of the following: α-methylstyrene monomer, metallocene polyolefin resin, atactic polypropylene (APP), olefin elastomers, ethylene-vinyl acetate copolymer, wax, paraffin wax, polyethylene wax, polypropylene wax, and C5 petroleum resin. Selecting a suitable resin can bind the eraser shavings produced during use into strips, effectively improving the erasure rate of the material and ensuring that the eraser shavings remain in strips, thus making it easier to maintain the cleanliness of the paper surface.

[0025] Compatibilizers include one or more of the following: SEBS-g-MAH (maleic anhydride-grafted styrene-ethylene-butene-styrene block copolymer), POE-g-MAH (maleic anhydride-grafted polyolefin elastomer), PE-g-MAH (maleic anhydride-grafted polyethylene), and PP-g-MAH (maleic anhydride-grafted polypropylene). Compatibilizers are a class of substances with an amphoteric structure; some groups in their molecules are compatible with fillers and acrylic elastomers, while others are compatible with TPE polymers. Through the action of compatibilizers, fillers with drastically different properties can be firmly bonded to TPE polymers, improving the dispersion of fillers in TPE, enhancing the overall performance of TPE eraser materials, and simultaneously reducing the whitening phenomenon on the eraser surface.

[0026] The antioxidant is selected from one or more of antioxidants such as 168, 1010, and 1076. Antioxidants can inhibit or delay the oxidative degradation of TPE eraser materials during processing, storage, and use, improve the material's aging resistance, and extend the product's service life.

[0027] Light stabilizers are one or more of ultraviolet absorbers and light stabilizers. Light stabilizers can effectively absorb or shield ultraviolet rays, reduce the damage of ultraviolet rays to TPE eraser materials, prevent aging and discoloration of materials due to light exposure, and ensure the stability of product appearance and performance.

[0028] Slip agents include one or more of the following: silicone masterbatch, polydimethylsiloxane, erucamide, oleamide, EBS (ethylene bis-stearamide), and stearic acid. During material molding, slip agents improve processing performance and enhance the surface feel of the eraser. More importantly, slip agents significantly reduce the coefficient of friction between the eraser surface and the paper, making erasing smoother and improving the user experience.

[0029] Another aspect of the present invention:

[0030] A method for preparing the above-mentioned lightweight, low-friction-resistance TPE eraser material is also provided, including the following steps:

[0031] Step S1: Mix the styrene block copolymer with white oil according to the above weight ratio, and then perform a thorough oil absorption operation to ensure that the white oil can penetrate evenly into the styrene block copolymer, laying a good foundation for the subsequent blending process.

[0032] Step S2: The product obtained from the oil absorption treatment in step S1 is added together with lightweight inorganic powder, filler, resin, compatibilizer, antioxidant, light stabilizer, slip agent and other raw materials into a blending device for thorough blending, so that the raw materials can be evenly dispersed to form a uniformly mixed material system.

[0033] Step S3: The mixture obtained in step S2 is added to a twin-screw extruder and melt-blended at a temperature of about 150°C to 200°C. After granulation, cooling and other processes, a lightweight, low-friction-resistance TPE eraser material is finally obtained. This material can be used for subsequent molding processes such as injection molding.

[0034] The beneficial effects of this invention are:

[0035] The lightweight, low-friction TPE eraser material and its preparation method provided by this invention achieve synergistic improvements in environmental safety and performance. Compared to traditional eraser materials, this material uses TPE as the base carrier, and the selected raw materials all meet mainstream international environmental standards, containing no harmful substances such as phthalate plasticizers and nonylphenol. This fundamentally avoids the health risks associated with the processing and use of traditional PVC materials, making it especially suitable for children and other sensitive groups. Simultaneously, through a scientifically proportioned styrene block copolymer and white oil system, combined with the interfacial modification effect of a compatibilizer, the inorganic filler and polymer matrix are uniformly dispersed. This ensures the material's mechanical stability and, through the introduction of lightweight inorganic powder, achieves a specific gravity of less than 1, solving the problems of traditional erasers being too heavy and inconvenient to carry.

[0036] Meanwhile, the innovative combination of this technical solution significantly optimizes the user experience and functionality of erasers. The synergistic effect of the specially structured styrene block copolymer and resin components allows the eraser to maintain high erasing efficiency while keeping the resulting eraser shavings tightly packed, preventing scattering and contamination. The precise addition of a slip agent effectively reduces the coefficient of friction between the material surface and the paper, making erasing smoother and less strenuous. Furthermore, the material is compatible with various processing methods such as extrusion and injection molding, exhibiting excellent molding stability and meeting the needs of large-scale production of erasers of different shapes and sizes. The composite formula of antioxidants and light stabilizers significantly improves the product's aging resistance, ensuring consistency in appearance and performance over long-term use. This provides the stationery industry with a new material option that combines environmental friendliness, lightweight, high-efficiency erasing, and good processability. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating a method for preparing a lightweight, low-friction-resistance TPE eraser material according to Embodiment 1 of the present invention. Figure 1 ;

[0039] Figure 2 This is a flowchart illustrating a method for preparing a lightweight, low-friction-resistance TPE eraser material according to Embodiment 2 of the present invention. Figure 2 ;

[0040] Figure 3 This is a flowchart illustrating a method for preparing a lightweight, low-friction-resistance TPE eraser material according to Embodiment 3 of the present invention. Figure 3 . Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0042] According to Embodiment 1 of the present invention, a lightweight, low-friction-resistance TPE eraser material and its preparation method are provided.

[0043] A lightweight, low-friction-resistance TPE eraser material is prepared from the following raw materials in parts by weight:

[0044] 100 copies of SEBS;

[0045] 150 parts of paraffin oil, with a viscosity of 32 mm at 40°C. 2 / s;

[0046] 50 portions of atactic polypropylene (APP);

[0047] SEBS-g-MAH 25 portions;

[0048] 300 parts of high-quality calcium carbonate powder, 800 mesh;

[0049] 200 parts of hollow glass microspheres;

[0050] 0.5 parts of 1010 antioxidant;

[0051] 0.5 parts of ultraviolet absorber (UV-531);

[0052] 3 parts silicone masterbatch;

[0053] like Figure 1 As shown, its preparation method includes the following steps:

[0054] Mix SEBS and paraffin oil according to the above weight proportions, stir evenly at room temperature, and let stand for 8 hours to fully absorb the oil;

[0055] The SEBS-paraffin oil mixture that has undergone oil absorption treatment is added together with atactic polypropylene, SEBS-g-MAH, high-quality calcium carbonate powder, hollow glass microspheres, 1010 antioxidant, ultraviolet absorber (UV-531), and silicone masterbatch into a high-speed mixer and mixed for 15 minutes at a speed of 1000 r / min to obtain a uniformly mixed material.

[0056] The mixture is added to a twin-screw extruder, and the temperature of each section of the extruder is set to 150℃~180℃ for melt blending. Then, after granulation and cooling, a lightweight, low-friction-resistance TPE eraser material is obtained.

[0057] According to Embodiment 2 of the present invention, a lightweight, low-friction-resistance TPE eraser material and its preparation method are provided.

[0058] A lightweight, low-friction-resistance TPE eraser material is prepared from the following raw materials in parts by weight:

[0059] 100 parts of SEPS, of which 10 parts are isoprene produced by 3,4 polymerization;

[0060] 120 parts of naphthenic oil, with a viscosity of 180 mm at 40°C. 2 / s;

[0061] 30 parts of ethylene-vinyl acetate copolymer;

[0062] POE-g-MAH 15 copies;

[0063] 200 parts talc powder, 1000 mesh;

[0064] 150 parts expanded perlite;

[0065] 0.3 parts of 168 antioxidant;

[0066] 0.3 parts of light stabilizer, yielding a concentration of 770.

[0067] 2 parts erucamide;

[0068] like Figure 2 As shown, its preparation method includes the following steps:

[0069] Mix SEPS and naphthenic oil according to the above weight proportions, stir at 30°C for 20 minutes, and then let stand for 12 hours to fully absorb the oil.

[0070] The SEPS-naphthenic oil mixture after oil absorption, along with ethylene-vinyl acetate copolymer, POE-g-MAH, talc, expanded perlite, antioxidant 168, light stabilizer (770), and erucamide, were added to a mixer and mixed for 20 minutes at a speed of 800 r / min to ensure uniform dispersion of the raw materials.

[0071] The mixed materials are fed into a twin-screw extruder, and the extrusion temperature is controlled at 160℃~190℃. After melt blending, granulation and cooling are performed to obtain a lightweight, low-friction-resistance TPE eraser material.

[0072] According to Embodiment 3 of the present invention, a lightweight, low-friction-resistance TPE eraser material and its preparation method are provided.

[0073] A lightweight, low-friction-resistance TPE eraser material is prepared from the following raw materials in parts by weight:

[0074] 100 parts of a mixture of SEBS and SEEPS in a weight ratio of 1:1;

[0075] 180 parts of paraffin oil, with a viscosity of 10 mm at 40°C. 2 / s;

[0076] 60 parts of C5 petroleum resin;

[0077] PP-g-MAH 35 parts;

[0078] 300 parts of barium sulfate, with a mesh size of 1250;

[0079] 200 parts of aerogel powder;

[0080] 0.8 parts of 1076 antioxidant;

[0081] 0.8 parts of ultraviolet absorber, namely UV-327;

[0082] 4 parts of polydimethylsiloxane;

[0083] like Figure 3 As shown, its preparation method includes the following steps:

[0084] Mix the SEBS and SEEPS mixture with paraffin oil in parts by weight, stir at room temperature for 1 hour, and then let it stand for 24 hours to fully absorb the oil.

[0085] The oil-absorbed mixture, along with C5 petroleum resin, PP-g-MAH, barium sulfate, aerogel powder, 1076 antioxidant, UV absorber (UV-327), and polydimethylsiloxane, is added to a high-speed mixer and mixed at 1200 r / min for 12 minutes to obtain a homogeneous material.

[0086] The uniform material is added to a twin-screw extruder and melt-blended at a temperature of 170℃~200℃. After granulation and cooling, a lightweight, low-friction-resistance TPE eraser material is obtained.

[0087] Using the above-described method, the performance of the TPE eraser materials prepared in Examples 1, 2, and 3 was tested, and the test results are shown in Table 1.

[0088] Table 1 Test Data Comparison Table

[0089]

[0090] As shown in Table 1, the lightweight, low-friction-resistance TPE eraser materials prepared in Examples 1, 2, and 3 of this invention all have a specific gravity of less than 1, achieving material lightweighting; they have a low coefficient of friction, exhibiting excellent low-friction-resistance characteristics; the erasure rate of each material exceeds 80%, meeting the requirements of the QB / T2309-2020 standard, and the shavings exhibit good strip-forming properties; at the same time, the materials comply with environmental standards such as RoHS, REACH (SVHC), and EN71, possessing excellent environmental performance and meeting practical application needs.

[0091] In summary, by utilizing the above-mentioned technical solution of this invention, the present invention uses TPE material, and the raw materials selected in the formula all comply with international environmental protection standards such as RoHS, REACH (SVHC), and EN71, and do not contain harmful substances such as phthalate plasticizers, nonylphenol NP, and polycyclic aromatic hydrocarbons (PAHs), thus ensuring the environmental safety of the product from the source. It is especially suitable for children and other groups, effectively avoiding the potential harm to human health caused by harmful substances contained in traditional PVC erasers.

[0092] In addition, the product has a smooth feel and a high degree of smoothness during use. Due to the low coefficient of friction of the material, users do not need to apply excessive force when erasing, effectively improving the comfort and convenience of use. At the same time, the eraser shavings form good strips. Through the reasonable selection of resin and other raw materials, the shavings produced during use can be well bound into strips, making them easy for users to clean up. This also avoids the pollution of the paper surface and the surrounding environment caused by the shavings scattering, ensuring the cleanliness of the paper surface.

[0093] Furthermore, the TPE eraser material prepared by this invention can easily achieve an erasure rate of over 80% (complying with standard QB / T2309-2020), which can quickly and thoroughly erase pencil marks and meet users' requirements for erasure effect; the material has a specific gravity of less than 1, which is significantly lighter than erasers with a specific gravity greater than water on the market, making it convenient to carry and use, especially suitable for students and other people who need to carry stationery frequently.

[0094] Meanwhile, the TPE eraser material provided by this invention, through adjustment of its formulation, is applicable to various processing methods such as extrusion and injection molding. It exhibits excellent processing fluidity and molding stability, meeting the production needs of erasers with different structures and shapes. Furthermore, the material is easily mass-produced with high production efficiency, helping to reduce production costs and laying a solid foundation for its widespread application in the stationery industry. The addition of antioxidants and light stabilizers to its formulation effectively inhibits oxidative and photo-aging phenomena during processing, storage, and use, delaying the degradation of material performance, extending the eraser's lifespan, and ensuring that the product maintains good appearance and performance even after long-term use.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Those skilled in the art, upon considering the disclosure in the specification and embodiments, will readily conceive of other embodiments of this disclosure. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the claims.

[0096] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A lightweight, low-friction-resistance TPE eraser material, characterized in that, It is prepared from the following raw materials in parts by weight: The composition includes 100 parts of styrene block copolymer, 100-200 parts of white oil, 20-80 parts of resin, 10-40 parts of compatibilizer, 50-500 parts of filler, 50-500 parts of lightweight inorganic powder, 0.1-1 part of antioxidant, 0.1-1 part of light stabilizer, and 1-5 parts of slip agent, wherein; The styrene block copolymer is one or a mixture of SEBS, SEPS, and SEEPS. The white oil has a viscosity of less than 200 mg / L at 40 degrees Celsius. 2 / s of white mineral oil; The filler is one or more of calcium carbonate, talc, barium sulfate, glass powder, kaolin, diatomite, and wollastonite, and the mesh size of the filler is greater than 400 mesh. The lightweight inorganic powder is one or more of expanded perlite, aerogel powder, hollow glass microspheres, closed-cell ceramic microspheres, and pumice powder. The resin is one or a mixture of α-methylstyrene monomer, metallocene polyolefin resin, random polypropylene (APP), olefin elastomer, ethylene-vinyl acetate copolymer, wax, paraffin wax, polyethylene wax, polypropylene wax, and C5 petroleum resin. The compatibilizer is one or a mixture of SEBS-g-MAH, POE-g-MAH, PE-g-MAH, and PP-g-MAH.

2. The lightweight, low-friction-resistance TPE eraser material according to claim 1, characterized in that, The antioxidant is one or more of antioxidants 168, 1010, and 1076.

3. The lightweight, low-friction-resistance TPE eraser material according to claim 2, characterized in that, The light stabilizer is one or more of ultraviolet absorbers and light stabilizers.

4. The lightweight, low-friction-resistance TPE eraser material according to claim 3, characterized in that, The antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a weight ratio of 1:1; the light stabilizer is a mixture of UV-531 ultraviolet absorber and light stabilizer 770 in a weight ratio of 1:

1.

5. The lightweight, low-friction-resistance TPE eraser material according to claim 1, characterized in that, The slip agent is one or a mixture of silicone masterbatch, polydimethylsiloxane, erucamide, oleamide, EBS, and stearic acid.

6. The lightweight, low-friction-resistance TPE eraser material according to claim 1, characterized in that, When the slip agent is a silicone masterbatch, it is added in parts of 2 to 5 by weight; and when the slip agent is erucamide, it is added in parts of 1 to 2 by weight.

7. A method for preparing a lightweight, low-friction-resistance TPE eraser material, used in the method for preparing the lightweight, low-friction-resistance TPE eraser material according to any one of claims 1-6, characterized in that, Includes the following steps: Step S1: Mix the styrene block copolymer with white oil according to the weight parts, and then allow the oil to be fully absorbed; Step S2: Add lightweight inorganic powder, filler, resin, compatibilizer, antioxidant, light stabilizer, and slip agent to the product obtained in step S1 and blend them. Step S3: The blend product obtained in step S2 is melt-blended by a twin-screw extruder at 150℃~200℃, then granulated and cooled to obtain a lightweight, low-friction-resistance TPE eraser material.

8. The method for preparing the lightweight, low-friction-resistance TPE eraser material according to claim 7, characterized in that, The oil absorption process in step S1 is carried out at room temperature or 30°C, and the oil absorption time is more than 8 hours.

9. The method for preparing the lightweight, low-friction-resistance TPE eraser material according to claim 7, characterized in that, Step S2 is carried out in a high-speed mixer at a speed of 800-1200 r / min for 12-20 minutes.

10. The method for preparing the lightweight, low-friction-resistance TPE eraser material according to claim 7, characterized in that, In step S2, the temperature of each section of the twin-screw extruder is controlled at 150℃~180℃ or 160℃~190℃ or 170℃~200℃, and the twin-screw speed is 300~400r / min during the melt blending process.

Images