Wear-resistant high-toughness automobile spare tire partition plate material and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, and particularly discloses a wear-resistant and high-toughness automobile spare tire partition plate material and a preparation method thereof. Comprising the following raw materials in parts by weight: 90-100 parts of a polypropylene / graphene oxide composite material, 20-30 parts of a reinforcing material, 4-6 parts of a compatilizer, 0.5-1 part of a lubricant, 0.4-0.8 part of an antioxidant and 15-20 parts of modified nanocellulose, the reinforcing material is organic-inorganic composite modified epoxy resin, the raw materials of the organic-inorganic composite modified epoxy resin comprise silane modified aluminum oxide, an epoxy resin emulsion and PDMS, and the mass ratio of the silane modified aluminum oxide to the epoxy resin emulsion to the PDMS is (0.02-0.05): (1-2): (0.1-0.2). The wear-resistant high-toughness automobile spare tire partition plate material provided by the invention has excellent wear resistance and high toughness, and can meet the bearing requirements of large heavy objects.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of high polymer materials, in particular to a wear-resistant high-toughness automobile spare tire partition plate material and a preparation method thereof. BACKGROUND

[0002] The automobile spare tire partition plate can effectively prevent the scattering of articles in the trunk caused by traffic accidents, thereby avoiding secondary injuries. On the other hand, the partition plate can also effectively fix the luggage and prevent the articles from moving or falling due to the bumping of the vehicle during driving.

[0003] The automobile spare tire partition plate is generally made of durable materials such as plastic or glass fiber reinforced plastic, and common materials include ABS engineering plastic or polypropylene honeycomb board. However, the toughness and wear resistance of these materials cannot completely meet the bearing requirements of heavy objects, and therefore there is an urgent need to prepare an automobile spare tire partition plate material with high toughness and good wear resistance. SUMMARY

[0004] In order to solve the problem that the existing spare tire partition plate material cannot completely meet the bearing requirements of heavy objects, the application provides a wear-resistant high-toughness automobile spare tire partition plate material and a preparation method thereof.

[0005] In the first aspect, the application provides a wear-resistant high-toughness automobile spare tire partition plate material, which adopts the following technical scheme: A wear-resistant high-toughness automobile spare tire partition plate material comprises the following raw materials by weight: Polypropylene / graphene oxide composite material 90-100 parts, reinforcing material 20-30 parts, compatibilizer 4-6 parts, lubricant 0.5-1 part, antioxidant 0.4-0.8 part, and modified nanocellulose 15-20 parts. The reinforcing material is an organic-inorganic composite modified epoxy resin, and the raw materials of the organic-inorganic composite modified epoxy resin include silane modified alumina, epoxy resin emulsion and PDMS. The mass ratio of silane modified alumina, epoxy resin emulsion and PDMS is 0.02-0.05:1-2:0.1-0.2.

[0006] By adopting the technical scheme, the polypropylene / graphene oxide composite material is used as a base body, the reinforcing material and the modified cellulose are added, and a high-toughness composite material is formed under the action of a compatibilizer. The graphene oxide is a sheet-shaped inorganic particle with excellent mechanical properties. By filling the polypropylene with the graphene oxide, the strength can be improved by using the rigidity support of the graphene oxide, and the stress concentration can be relieved by interface sliding and sheet layer dispersion, so that the strength and toughness are simultaneously improved. The reinforcing material is an organic-inorganic composite modified epoxy resin. The organic phase can absorb energy by deformation, and the impact toughness is greatly improved. The inorganic nano filler can enhance the wear resistance and hardness by rigidity support and crack deflection mechanism, so that the material is not easy to break under high load, and the functions of toughening and improving wear resistance are simultaneously achieved. The compatibility of the nano cellulose with the polypropylene / graphene oxide composite material is improved after the interface modification, and the wear resistance of the composite material can be improved. Therefore, the automobile spare tire partition material prepared from the polypropylene / graphene oxide composite material, the reinforcing material and the modified cellulose has the comprehensive mechanical properties of high toughness and wear resistance, and can meet the load bearing demand of heavy objects.

[0007] Optionally, the preparation method of the polypropylene / graphene oxide composite material comprises the following steps: (1) adding the hydrolyzed APTES into the graphene oxide suspension, drying to obtain modified graphene oxide; (2) hot melting, extruding and granulating the modified graphene oxide in step (1) and polypropylene to obtain the polypropylene / graphene oxide composite material, and the mass ratio of APTES, graphene oxide and polypropylene is 0.02-0.04:1-1.5:10.

[0008] By adopting the technical scheme, the graphene oxide is modified by APTES, the amino and siloxane groups are grafted on the surface of the graphene oxide, the dispersibility of the graphene oxide in the base body is improved, and the compatibility with the polypropylene is enhanced. Since the graphene oxide has high strength, the sheet structure exists in the polypropylene base body like "pinning". When the composite material is broken under impact load, the graphene oxide generally does not break but is pulled out from the side with weak interfacial layer bonding. After the micro-crack process, the graphene oxide sheet layer begins to separate from the polypropylene base body and is pulled out. In the process of pulling out, the crack deflection effect is achieved, the further expansion of the crack is inhibited, and the effect of toughening the polypropylene is achieved.

[0009] Optionally, the preparation method of the organic-inorganic composite modified epoxy resin comprises the following steps: The epoxy resin emulsion is mixed with PDMS, and the silane modified alumina is added to obtain an epoxy resin mixture. The epoxy resin mixture is cured, crushed and ground to obtain the organic-inorganic composite modified epoxy resin.

[0010] By adopting the technical scheme, the siloxane chain segment is introduced into the epoxy resin emulsion to modify the organic matrix, so that the epoxy resin material has high toughness and can absorb and disperse external force, thereby reducing the stress concentration in the epoxy resin material and improving the impact resistance and fracture toughness of the epoxy resin material. The alumina nanoparticles can play an "anchoring" role in the epoxy matrix. When mechanical damage caused by external stress extends to the alumina nanoparticles, it can effectively prevent further extension of the damage, thereby improving the toughness of the composite material. At the same time, the alumina nanoparticles themselves have high hardness and wear resistance. When the alumina nanoparticles are uniformly dispersed in the epoxy resin, they can act as a "rigid skeleton" to bear external friction load, reducing the stress directly borne by the epoxy resin matrix, thereby reducing the plastic deformation and wear and tear of the matrix. The siloxane chain segment can improve the interfacial compatibility between the epoxy resin and the alumina nanoparticle filler, and under the combined modification of organic and inorganic, the wear resistance and high toughness of the epoxy resin are improved, and the wear resistance and toughness of the separator material are improved.

[0011] Optionally, the preparation method of the modified nanocellulose comprises the following steps: (1) adding nanocellulose into water, uniformly ultrasonicating, freeze-drying to obtain a porous material; (2) soaking the porous material in a sodium silicate solution, vacuum impregnating at 0.08-0.5 MPa for 0.5-3 h, drying to obtain a modified porous material; (3) soaking the modified porous material in an epoxy resin emulsion containing ethylenediamine, vacuum impregnating at 0.08-0.5 MPa for 0.5-3 h, drying to obtain the modified nanocellulose; the mass ratio of the porous material, the sodium silicate solution and the epoxy resin emulsion containing ethylenediamine is 1:1.2-1.5:1.5-2.

[0012] By adopting the technical scheme, the nano-cellulose after freeze-drying has a three-dimensional network porous structure, and has high mechanical strength itself. In the impregnation process, sodium silicate is hydrolyzed to form a polysilicate network structure, thereby improving the toughness of the porous material. The use of an epoxy resin emulsion containing ethylenediamine can not only integrate the advantages of sodium silicate impregnation, but also greatly improve the bending strength and hardness. The introduction of an epoxy-amine impregnation system further optimizes the structural stability caused by sodium silicate solidification, prevents stress concentration, and prevents the porous material from breaking when subjected to impact. The porous material also improves the interfacial defects when directly blended with polypropylene, and forms a double-network interconnected structure of a polysilicon rigid skeleton network and an epoxy-amine flexible crosslinking network inside the porous material. Thus, a synergistic reinforcing effect of cellulose skeleton, sodium silicate reinforcement, and epoxy resin interfacial bonding and toughening is formed in the separator material. This double-network interconnected structure endows the nano-cellulose with excellent chemical stability, mechanical stability, and durable interfacial adhesion, thereby improving the comprehensive mechanical properties of the modified nano-cellulose. As a result, the tensile strength, bending strength, and modulus of the automobile spare tire separator material are improved, and the toughness and wear resistance are improved.

[0013] Optionally, the compatibilizer is polypropylene grafted glycidyl methacrylate.

[0014] By adopting the technical scheme, the polyolefin chain in the compatibilizer molecule is combined with the polar group in the epoxy resin. At the same time, the glycidyl ester can undergo ring-opening reaction with the hydroxyl group or amine curing agent in the epoxy resin to form a chemical bond, thereby improving the compatibility of the polypropylene composite material with the epoxy resin composite material, and further improving the toughness and wear resistance of the spare tire separator material.

[0015] Optionally, the antioxidant is antioxidant 1010 and / or antioxidant 168.

[0016] By adopting the technical scheme, the antioxidant can enhance the resistance of the material to environmental factors, delay or inhibit the degradation and aging of the material due to oxidation, and fundamentally reduce the oxidative damage of the material. The automobile spare tire separator can maintain stable appearance and performance under different use conditions, and prolong the service life.

[0017] Optionally, the lubricant is selected from one or more of EBS, TAF, and PETS.

[0018] By adopting the technical scheme, the lubricant not only can adjust the compatibility between the component materials, but also can further reduce the friction between the plastic particles and the mold during the material processing, reduce the energy consumption, reduce the mold loss, and improve the production efficiency.

[0019] In a second aspect, the application provides a preparation method of a wear-resistant high-toughness automobile spare tire separator material, which adopts the following technical scheme: A preparation method of a wear-resistant high-toughness automobile spare tire partition plate material, comprising the following steps: Mixing the polypropylene / graphene oxide composite material, the reinforcing material, the modified nanocellulose, the compatibilizer, the lubricant and the antioxidant uniformly, and extruding and granulating to obtain the wear-resistant high-toughness automobile spare tire partition plate material.

[0020] By adopting the above technical scheme, the raw materials are mixed and granulated to obtain the spare tire partition plate material, which can be made into a base plate of the spare tire partition plate through hot melting and injection molding. The base plate can be bonded with non-woven fabric or needle-punched fabric, glass fiber cloth and the like through glue or adhesive film to make the spare tire partition plate.

[0021] In summary, the present application has the following beneficial effects: 1. The present application fills polypropylene with graphene oxide, which improves the wear resistance of polypropylene and enhances the toughness of polypropylene. The organic phase and the inorganic phase have a significant synergistic effect on improving the wear resistance and toughness of the epoxy resin. The organic phase absorbs impact energy through the flexible deformation of the molecular chain, effectively resisting brittle fracture caused by external impact. The inorganic nanofiller enhances the wear resistance by virtue of high hardness and rigidity, reduces surface loss during friction, and makes the automobile spare tire partition plate material have high toughness and wear resistance.

[0022] 2. In the present application, APTES is used to modify graphene oxide, and amino and siloxane groups are grafted on the surface of graphene oxide to form a stable chemical bridge, which greatly enhances the interfacial bonding force between graphene oxide and polypropylene. The lamellar structure of graphene oxide can further disperse stress through crack deflection, significantly improving the toughness of polypropylene, thereby improving the toughness of the automobile spare tire partition plate material.

[0023] 3. In the present application, the nanocellulose after freeze-drying is modified by using an epoxy resin emulsion containing ethylenediamine and sodium silicate. The epoxy-amine system can effectively fix the sodium silicate inside the nanocellulose, making the structure more stable and stable, and the modified nanocellulose has good mechanical properties and excellent chemical stability, thereby improving the wear resistance and strength of the spare tire partition plate material. DETAILED DESCRIPTION

[0024] The following examples further illustrate the present application.

[0025] Preparation example of polypropylene / graphene oxide composite material Preparation Example 1-1: (1) 1 g of graphene oxide was added to 99 g of deionized water and ultrasonically dispersed for 30 min to prepare a graphene oxide suspension. 0.02 g of APTES was added to 10 g of a mixture of deionized water / ethanol (volume ratio of 3:7), the pH was adjusted to 5, and hydrolysis was performed by stirring for 30 min. The mixture was added to the graphene oxide suspension, mixed uniformly, and dried to obtain modified graphene oxide. The graphene oxide was obtained from Qinghe County Banyu Metal Material Co., Ltd. and had a product code of BY-20040; (2) The modified graphene oxide of step (1) was hot-melted, extruded, and granulated with 10 g of polypropylene to obtain a polypropylene / graphene oxide composite material. The polypropylene was obtained from Suzhou Xinlilion Plastic Co., Ltd. and had a product code of k8003. The hot-melt extrusion temperature was 220°C.

[0026] Preparation Example 1-2: (1) 1.5 g of graphene oxide was added to 98.5 g of deionized water and ultrasonically dispersed for 30 min to prepare a graphene oxide suspension. 0.04 g of APTES was added to 10 g of a mixture of deionized water / ethanol (volume ratio of 3:7), the pH was adjusted to 5, and hydrolysis was performed by stirring for 30 min. The mixture was added to the graphene oxide suspension, mixed uniformly, and dried to obtain modified graphene oxide. The graphene oxide was obtained from Qinghe County Banyu Metal Material Co., Ltd. and had a product code of BY-20040; (2) The modified graphene oxide of step (1) was hot-melted, extruded, and granulated with 10 g of polypropylene to obtain a polypropylene / graphene oxide composite material. The polypropylene was obtained from Suzhou Xinlilion Plastic Co., Ltd. and had a product code of k8003. The hot-melt extrusion temperature was 220°C.

[0027] Preparation Example 1-3: The difference from Preparation Example 1-1 is that the graphene oxide was not modified with APTES. 1 g of graphene oxide and 10 g of polypropylene were mixed, hot-melted, and granulated to obtain a polypropylene / graphene oxide composite material. The hot-melt temperature was 220°C.

[0028] Preparation Example of Organic-Inorganic Composite Modified Epoxy Resin Preparation Example 2-1: (1) Preparation of silane-modified alumina: The alumina was dried at 100°C for 3 h. 0.01 g of silane coupling agent was added to 10 g of a mixture of ethanol and water (volume ratio of 7:3), the pH was adjusted to 5 with dilute hydrochloric acid, and the mixture was stirred uniformly. The dried alumina was added and ultrasonically dispersed at a power of 300 W for 20 min. The temperature was increased to 70°C and stirring was performed for 30 min. Centrifugation, washing with anhydrous ethanol, and drying were performed to obtain silane-modified alumina. The silane coupling agent was KH560, and the amount of silane coupling agent was 3% of the mass of the alumina; (2) 10 g of epoxy resin and curing agent were mixed uniformly at a mass ratio of 1:0.1 to prepare an epoxy resin emulsion, 10 g of the epoxy resin emulsion was mixed uniformly with 1 g of PMDS, and 0.2 g of the silane-modified alumina prepared in step (1) was added and mixed uniformly to prepare an epoxy resin mixture, which was dried at 80°C, crushed, and sieved through a 300-mesh sieve to prepare an organic-inorganic composite modified epoxy resin; the PDMS was selected from Guangzhou Shengyi Chemical Co., Ltd., and the model was PMX-200 1000 cSt; the epoxy resin was selected from Shandong Jinyu Chemical Co., Ltd., and the model was E44 E51; and the curing agent was selected from Dongguan Baineng New Material Co., Ltd., and the model was Bayer curing agent L75.

[0029] Preparation Example 2-2: (1) Preparation of silane-modified alumina: The alumina was dried at 100°C for 3 h, 0.01 g of a silane coupling agent was added to a mixture of 10 g of ethanol and water (volume ratio of 7:3), the pH was adjusted to 5 with dilute hydrochloric acid, and the mixture was stirred uniformly and then the dried alumina was added, ultrasonic dispersion was performed at a power of 300 W for 20 min, the temperature was raised to 70°C, and stirring was performed for 30 min, followed by centrifugation, washing with anhydrous ethanol, and drying to prepare the silane-modified alumina; the silane coupling agent was KH560, and the amount of the silane coupling agent was 3% of the mass of the alumina; (2) 20 g of epoxy resin and curing agent were mixed uniformly at a mass ratio of 1:0.1 to prepare an epoxy resin emulsion, 20 g of the epoxy resin emulsion was mixed uniformly with 2 g of PMDS, and 0.5 g of the silane-modified alumina prepared in step (1) was added and mixed uniformly to prepare an epoxy resin mixture, which was dried at 80°C, crushed, and sieved through a 300-mesh sieve to prepare an organic-inorganic composite modified epoxy resin; the PDMS was selected from Guangzhou Shengyi Chemical Co., Ltd., and the model was PMX-200 1000 cSt; the epoxy resin was selected from Shandong Jinyu Chemical Co., Ltd., and the model was E44 E51; and the curing agent was selected from Dongguan Baineng New Material Co., Ltd., and the model was Bayer curing agent L75.

[0030] Preparation Example 2-3: Different from Preparation Example 2-1, no PDMS was added to the epoxy resin mixture, and the epoxy resin mixture was prepared by mixing 10 g of an epoxy resin emulsion and 0.2 g of silane-modified alumina uniformly, drying at 80°C, crushing, and sieving through a 300-mesh sieve to prepare an organic-inorganic composite modified epoxy resin.

[0031] Preparation Example 2-4: Different from Preparation Example 2-1, no silane-modified alumina was added to the epoxy resin mixture, and the epoxy resin mixture was prepared by mixing 10 g of an epoxy resin emulsion and 1 g of PDMS uniformly, drying at 80°C, crushing, and sieving through a 300-mesh sieve to prepare an organic-inorganic composite modified epoxy resin.

[0032] Preparation Example of Modified Nanocellulose Preparation Example 3-1: (1) 10 g of nanocellulose was added to 20 g of water, uniformly ultrasonic, and freeze-dried at -30℃ for 6 h to obtain a porous material; the nanocellulose was selected from Zhejiang Jinhao Green Nanomaterials, model CNF-B5; (2) 10 g of the porous material was soaked in 12 g of a sodium silicate solution with a concentration of 20 wt%, vacuum impregnated at 0.08 MPa for 0.5 h, and the porous material was taken out and dried at 103℃ for 6 h to obtain a modified porous material; the sodium silicate solution was prepared from sodium silicate and deionized water; (3) The modified porous material was soaked in 15 g of an epoxy resin emulsion containing ethylenediamine, vacuum impregnated at 0.08 MPa for 0.5 h, taken out, and dried at 60℃ for 24 h to obtain modified nanocellulose; the epoxy resin emulsion containing ethylenediamine was prepared by mixing epoxy resin and ethylenediamine at a mass ratio of 1:0.05, and the epoxy resin was selected from Shandong Jinyu Chemical Co., Ltd., model E44E51.

[0033] Preparation Example 3-2: (1) 10 g of nanocellulose was added to 20 g of water, uniformly ultrasonic, and freeze-dried at -30℃ for 6 h to obtain a porous material; the nanocellulose was selected from Zhejiang Jinhao Green Nanomaterials, model CNF-B5; (2) 10 g of the porous material was soaked in 15 g of a sodium silicate solution with a concentration of 20 wt%, vacuum impregnated at 0.5 MPa for 3 h, and the porous material was taken out and dried at 103℃ for 6 h to obtain a modified porous material; the sodium silicate solution was prepared from sodium silicate and deionized water; (3) The modified porous material was soaked in 20 g of an epoxy resin emulsion containing ethylenediamine, vacuum impregnated at 0.5 MPa for 3 h, taken out, and dried at 60℃ for 24 h to obtain modified nanocellulose; the epoxy resin emulsion containing ethylenediamine was prepared by mixing epoxy resin and ethylenediamine at a mass ratio of 1:0.05, and the epoxy resin was selected from Shandong Jinyu Chemical Co., Ltd., model E44E51.

[0034] Preparation Example 3-3: The difference from Preparation Example 3-1 is that the modified porous material is the modified nanocellulose without soaking the epoxy resin emulsion containing ethylenediamine.

[0035] Preparation Example 3-4: The difference from Preparation Example 3-1 is that the porous material is directly soaked in 15 g of an epoxy resin emulsion containing ethylenediamine without soaking the sodium silicate solution, vacuum impregnated at 0.08 MPa for 0.5 h, taken out, and dried at 60℃ for 24 h to obtain modified nanocellulose.

[0036] Preparation Example 3-5: The difference from Preparation Example 3-1 is that the nanocellulose is not freeze-dried, and the nanocellulose is sequentially vacuum soaked in a sodium silicate solution and an epoxy resin emulsion, and the specific method is as follows: (1) 10 g of nanocellulose was soaked in 12 g of a sodium silicate solution with a concentration of 20 wt%, vacuum impregnated at 0.08 MPa for 0.5 h, taken out, and dried at 103°C for 6 h to obtain modified nanocellulose; the sodium silicate solution was prepared from sodium silicate and deionized water; the nanocellulose was selected from Zhejiang Jinjiahao Green Nanometer Material, model CNF-B5; (2) The modified nanocellulose was soaked in 15 g of an epoxy resin emulsion containing ethylenediamine, vacuum impregnated at 0.08 MPa for 0.5 h, taken out, and dried at 60°C for 24 h to obtain modified nanocellulose; the epoxy resin emulsion containing ethylenediamine was prepared by mixing epoxy resin and ethylenediamine at a mass ratio of 1:0.05, and the epoxy resin was selected from Shandong Jinyu Chemical Co., Ltd., model E44E51. Example

[0037] Example 1: A wear-resistant high-toughness automobile spare tire separator material, the raw material ratio is shown in Table 1, and the polypropylene / graphene oxide composite material is prepared according to Preparation Example 1-1; the reinforcing material is an organic-inorganic composite modified epoxy resin, which is prepared according to Preparation Example 2-1; the compatibilizer is polypropylene grafted glycidyl methacrylate, which is selected from Dongguan Kadar Plastic Raw Material Co., Ltd., and the product code is 50E571; the polypropylene is selected from Suzhou Xinlilion Plastic Co., Ltd., and the product code is k8003; the lubricant is EBS; the antioxidant is antioxidant 1010; and the modified nanocellulose is prepared according to Preparation Example 3-1.

[0038] The preparation method of the wear-resistant high-toughness automobile spare tire separator material comprises the following steps: The polypropylene / graphene oxide composite material, the reinforcing material, the modified nanocellulose, the compatibilizer, the lubricant, and the antioxidant are uniformly mixed, the temperature is controlled at 130°C, and stirring is performed for 40 min to obtain a mixture; The mixture is melt-extruded by a double-screw extruder, wherein the first section is 220°C, the second section is 250°C, the third section is 260°C, the die head is 250°C, and the mixture is cooled to room temperature, granulated, and a wear-resistant high-toughness automobile spare tire separator material is obtained.

[0039] Table 1 Raw material ratio of the wear-resistant high-toughness automobile spare tire separator material in Examples 1-4 Example 2: A wear-resistant high-toughness automobile spare tire separator material, which is different from Example 1 in that the polypropylene / graphene oxide composite material is prepared according to Preparation Example 1-2, and the raw material usage is shown in Table 1.

[0040] Examples 3-4: A wear-resistant high-toughness automobile spare tire separator material, which is different from Example 1 in that the raw material usage is different, as shown in Table 1.

[0041] Example 5: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the organic-inorganic composite modified epoxy resin is made from Preparation Example 2-2.

[0042] Example 6: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the modified nanocellulose is made from Preparation Example 3-2.

[0043] Example 7: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the polypropylene / graphene oxide composite material is made from Preparation Example 1-3.

[0044] Example 8: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the modified nanocellulose is made from Preparation Example 3-3.

[0045] Example 9: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the modified nanocellulose is made from Preparation Example 3-4.

[0046] Example 10: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the modified nanocellulose is made from Preparation Example 3-5.

[0047] Comparative Example Comparative Example 1: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the organic-inorganic composite modified epoxy resin is made from Preparation Example 2-3.

[0048] Comparative Example 2: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the organic-inorganic composite modified epoxy resin is made from Preparation Example 2-4.

[0049] Comparative Example 3: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the reinforcing material is aluminum oxide.

[0050] Comparative Example 4: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that no reinforcing material is added.

[0051] Comparative Example 5: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that polypropylene is used instead of polypropylene / graphene oxide composite material in equal amounts, and the polypropylene is selected from Suzhou Xinli Long Plastic Co., Ltd., with a product code of k8003.

[0052] Comparative Example 6: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that no modified nanocellulose is added.

[0053] Comparative Example 7: A wear-resistant high-toughness automobile spare tire separator material, which differs from Example 1 in that the nanocellulose is not modified.

[0054] Performance testing Wear-resistant and high-toughness automotive spare tire partition material was prepared according to the methods in the examples and comparative examples, and its performance was tested according to the following methods. The test data are recorded in Table 2.

[0055] 1. Tensile strength: Tested in accordance with GB / T1040-2006 "Determination of tensile properties of plastics - Part 1: General rules" with a tensile speed of 5 mm / min.

[0056] 2. Wear: The injection-molded sample was 3cm*2cm*0.5cm in size. The wear resistance was tested using a multi-functional friction and wear testing machine (UMT-2 type, CETR Corporation, USA). The counter sample was a 45 steel ring. The rotation speed was 200r / min, the load was 160N, and the test time was 30min.

[0057] 3. Bending Strength: Sample preparation and three-point bending tests were conducted according to GB / T 1446—2005 "General Rules for Test Methods of Fiber Reinforced Plastics" and GB / T1456—2005 "Test Method for Bending Properties of Sandwich Structures". Bending tests were performed on an RGY-5 microcomputer-controlled electronic universal testing machine (Shenzhen Ruigeer Instrument Co., Ltd.) with a loading speed of 10 mm / min to obtain relevant performance indicators.

[0058] 4. Notched impact: According to GB / T16420-1996 "Test Method for Small Specimens of Plastic Impact Performance", a V-shaped notch (notch depth is 20% of the width) is milled out using a universal sample preparation machine, and then the notched impact strength is determined using a cantilever beam impact testing machine. The test temperature is 20℃ and the humidity is 30%RH.

[0059] Table 2 Test data of wear-resistant and high-toughness automotive spare tire partition material As can be seen from Examples 1-6 and Table 2, the wear-resistant and high-toughness automotive spare tire partition material prepared in this application has excellent wear resistance and high toughness, which can meet the load-bearing requirements of large and heavy objects.

[0060] Combining Examples 1 and 7 with Table 2, it can be seen that, compared with Example 1, the spare tire partition material prepared in Example 7 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that APTES modification of graphene oxide can improve the dispersion of graphene oxide in the matrix, thereby enhancing its compatibility with polypropylene and thus improving the wear resistance and high toughness of the automotive spare tire partition material.

[0061] Combining Examples 1 and 8 with Table 2, it can be seen that, compared with Example 1, the spare tire partition material prepared in Example 8 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that the addition of the epoxy-amine impregnation system further optimizes the structural system induced by sodium silicate curing, prevents stress concentration, makes the porous material less prone to fracture under impact, and improves the toughness and wear resistance of the spare tire partition material.

[0062] Combining Examples 1 and 9 with Table 2, it can be seen that, compared with Example 1, the spare tire partition material prepared in Example 9 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that the polysilicate network structure formed by the hydrolysis of sodium silicate improves the toughness and wear resistance of the material, thereby enhancing the toughness and wear resistance of the spare tire partition material.

[0063] Combining Examples 1 and 10 with Table 2, it can be seen that, compared with Example 1, the spare tire partition material prepared in Example 10 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that the freeze-dried nanocellulose has a three-dimensional network porous structure and high mechanical strength, thereby improving the toughness and wear resistance of the material.

[0064] Based on Example 1 and Comparative Example 1, and in conjunction with Table 2, it can be seen that, compared to Example 1, the spare tire partition material prepared in Comparative Example 1 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that introducing siloxane segments into the epoxy resin emulsion and modifying it with an organic matrix gives the epoxy resin material higher toughness, enabling it to absorb and disperse external forces, thereby reducing stress concentration within the epoxy resin material and improving its impact resistance and bending strength.

[0065] Based on Example 1 and Comparative Example 2, and referring to Table 2, it can be seen that, compared to Example 1, the spare tire partition material prepared in Comparative Example 2 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that silane-modified alumina itself has high hardness and wear resistance. When silane-modified alumina is uniformly dispersed in epoxy resin, it can act as a "rigid skeleton" to bear external friction loads, thereby improving the wear resistance and high toughness of epoxy resin, and thus improving the wear resistance and toughness of the spare tire partition material.

[0066] Based on Example 1 and Comparative Example 3, and in conjunction with Table 2, it can be seen that, compared to Example 1, the spare tire partition material prepared in Comparative Example 3 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that using alumina alone cannot achieve good wear resistance and high toughness, while epoxy resin, under the combined modification of organic and inorganic materials, improves its own toughness and wear resistance.

[0067] Based on Example 1 and Comparative Example 4, and in conjunction with Table 2, it can be seen that, compared to Example 1, the spare tire partition material prepared in Comparative Example 4 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength; indicating that the addition of reinforcing materials significantly improves the wear resistance and toughness of the spare tire partition material.

[0068] Combining Example 1 and Comparative Example 5 with Table 2, it can be seen that, compared with Example 1, the spare tire partition material prepared in Comparative Example 5 has a lower tensile strength than that in Example 1, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that by filling polypropylene with graphene oxide, the rigid support of graphene oxide is used to improve the strength of polypropylene, and stress concentration is relieved through interface slip and sheet dispersion, thus achieving a simultaneous improvement in strength and toughness.

[0069] Based on Example 1 and Comparative Example 6, and in conjunction with Table 2, it can be seen that, compared to Example 1, the spare tire partition material prepared in Comparative Example 6 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that the addition of modified nanocellulose improves the wear resistance and high toughness of the matrix, thereby improving the wear resistance and toughness of the automotive spare tire partition material.

[0070] Based on Example 1 and Comparative Example 7 and Table 2, it can be seen that, compared with Example 1, the spare tire partition material prepared in Comparative Example 7 has lower tensile strength, increased wear, decreased bending strength, and decreased notched impact strength. This indicates that after interface modification, nanocellulose has improved compatibility with polypropylene / graphene oxide composite materials, which can improve the wear resistance and toughness of the composite material.

[0071] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high toughness, wear resistant material for automotive spare tire separators, characterized in that, The raw materials include the following weight parts: 90-100 parts of polypropylene / oxidized graphene composite material, 20-30 parts of reinforcing material, 4-6 parts of compatibilizer, 0.5-1 part of lubricant, 0.4-0.8 part of antioxidant, 15-20 parts of modified nanocellulose; The reinforcing material is an organic-inorganic composite modified epoxy resin, and raw materials of the organic-inorganic composite modified epoxy resin include silane modified alumina, epoxy resin emulsion and PDMS, and the mass ratio of silane modified alumina, epoxy resin emulsion and PDMS is 0.02-0.05:1-2:0.1-0.

2.

2. A high toughness, wear resistant material for automotive spare tire separators according to claim 1, wherein, The preparation method of the polypropylene / oxidized graphene composite material includes the following steps: (1) adding hydrolyzed APTES to the graphene oxide suspension, drying to obtain modified graphene oxide; (2) hot melting, extruding and granulating the modified graphene oxide of step (1) and polypropylene to obtain polypropylene / oxidized graphene composite material, and the mass ratio of APTES, graphene oxide and polypropylene is 0.02-0.04:1-1.5:

10.

3. A high toughness, wear resistant material for automotive spare tire separators according to claim 1, wherein, The preparation method of the organic-inorganic composite modified epoxy resin includes the following steps: Mixing the epoxy resin emulsion and PDMS, adding silane modified alumina to obtain an epoxy resin mixture, and curing, crushing and grinding to obtain the organic-inorganic composite modified epoxy resin.

4. A high toughness, wear resistant material for automotive spare tire separators according to claim 1, wherein, The preparation method of the modified nanocellulose includes the following steps: (1) adding nanocellulose to water, uniformly ultrasonicating, and freeze-drying to obtain a porous material; (2) soaking the porous material in a sodium silicate solution, vacuum impregnating at 0.08-0.5 MPa for 0.5-3 h, and drying to obtain a modified porous material; (3) soaking the modified porous material in an epoxy resin emulsion containing ethylenediamine, vacuum impregnating at 0.08-0.5 MPa for 0.5-3 h, and drying to obtain the modified nanocellulose; and the mass ratio of the porous material, the sodium silicate solution and the epoxy resin emulsion containing ethylenediamine is 1:1.2-1.5:1.5-2.

5. A high toughness, wear resistant material for automotive spare tire separators according to claim 1, wherein, The compatibilizer is polypropylene grafted glycidyl methacrylate.

6. A high toughness, wear resistant material for automotive spare tire separators according to claim 1, wherein, The antioxidant is antioxidant 1010 and / or antioxidant 168.

7. A high toughness, wear resistant material for automotive spare tire separators according to claim 1, wherein The lubricant is selected from one or more of EBS, TAF and PETS.

8. The method of claim 1-7, wherein the method of manufacturing a high- wear, high-toughness automotive spare tire separator material is characterized by, The method includes the following steps: Mixing the polypropylene / oxidized graphene composite material, the reinforcing material, the modified nanocellulose, the compatibilizer, the lubricant and the antioxidant uniformly, and extruding and granulating to obtain the wear-resistant high-toughness automobile spare tire separator material.

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