High-elasticity anti-collision material and preparation method thereof

Abstract

The invention discloses a high-elasticity anti-collision material and a preparation method thereof, and belongs to the technical field of high polymer materials.The high-elasticity anti-collision material is prepared from, by weight, 56-93 parts of raw silicone rubber, 3-6 parts of antioxidant flexible cross-linking agent, 1-5 parts of hydroxyl silicone oil, 0.1-1.5 parts of catalyst, 0.1-0.5 part of inhibitor, 0.01-1 part of hydrogen-containing silicone oil and 15-40 parts of fumed silica. And 0.1 to 0.5 part of an antibacterial agent. By adding the antioxidant flexible cross-linking agent, the prepared high-elasticity anti-collision material has excellent elasticity, oxidation resistance and antibacterial performance, and can be used for anti-collision protection.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a highly elastic impact-resistant material and its preparation method. Background Technology

[0002] In daily life, sharp edges on the frames of wooden, metal, and glass products, such as window corners and table corners, are unavoidable. These edges can easily cause injuries to children while running and playing, posing a safety risk. Therefore, many manufacturers have developed highly elastic impact-resistant materials to wrap these sharp parts and reduce the risk of head and body injuries. Silicone rubber is a typical example of a highly elastic material. Its flexible -Si-O-Si chains allow it to absorb kinetic energy through deformation upon impact, reducing the transmission of impact force and thus achieving impact protection. However, currently available elastic silicone rubber materials suffer from insufficient elasticity and short lifespan due to aging, requiring replacement after a period of use to maintain their protective effect. Summary of the Invention

[0003] To overcome the shortcomings of the existing technology, this invention provides a highly elastic anti-collision material and its preparation method. The highly elastic anti-collision material is prepared by placing raw silicone rubber, an antioxidant flexible crosslinking agent, hydroxyl silicone oil, hydrogen-containing silicone oil, an inhibitor, fumed silica, a catalyst, and an antibacterial agent in a vulcanizing machine. Introducing flexible long-chain polytetrahydrofuran ether diol into the crosslinking agent imparts high elasticity to the material, achieving the purpose of anti-collision protection. The triazine ring in the crosslinking agent can absorb free radicals in ultraviolet light, thereby endowing the material with antioxidant properties. In rainy or humid environments, the antibacterial powder in the material degrades, releasing the antibacterial drug polyhexamethylene guanidine, inhibiting the generation and growth of bacteria.

[0004] The purpose of this invention is to provide a highly elastic anti-collision material and its preparation method.

[0005] This invention is achieved through the following technical solution:

[0006] A highly elastic anti-collision material, comprising, by weight, the following components: 56-93 parts of raw silicone rubber, 3-6 parts of an antioxidant flexible crosslinking agent, 1-5 parts of hydroxyl silicone oil, 0.1-1.5 parts of a catalyst, 0.1-0.5 parts of an inhibitor, 0.01-1 parts of hydrogen-containing silicone oil, 15-40 parts of fumed silica, and 0.1-0.5 parts of an antibacterial agent. The structural formula of the antioxidant flexible crosslinking agent is shown in Formula 1.

[0007]

[0008] Preferably, the raw silicone rubber is methyl vinyl silicone rubber MVQ110-0 and methyl vinyl silicone rubber MVQ110-3, with a mass ratio of 0.1 to 0.2.

[0009] Preferably, the inhibitor is ethynylcyclohexanol.

[0010] Preferably, the catalyst is a cassiterite catalyst.

[0011] Preferably, the antibacterial agent is a polyhexamethylene guanidine antibacterial agent.

[0012] In one specific embodiment, the preparation of the antioxidant flexible crosslinking agent includes the following steps:

[0013] S1. Epoxidized polytetrahydrofuran ether diol (EPTMEG):

[0014] Under a nitrogen atmosphere, polytetrahydrofuran ether diol, epichlorohydrin, and a phase transfer catalyst were added to a reactor, and the temperature was slowly raised to 60°C. A 20% NaOH solution was slowly added dropwise, and the temperature was raised to 80°C with stirring for 4-6 hours until the reaction was complete. The mixture was cooled and allowed to stand for phase separation. The organic phase was washed with deionized water until neutral, and then distilled under reduced pressure to obtain epoxidized polytetrahydrofuran ether diol. Preferably, the molecular weight of the polytetrahydrofuran ether diol is 1000-3000 g / mol.

[0015] S2. Antioxidant polytetrahydrofuran ether diol (TTZ-PTMEG): Dissolve EPTMEG in anhydrous isopropanol, add triethylamine, purge with nitrogen, and add the antioxidant functional component in batches. Heat to 70°C and stir to dissolve. React for 6 hours until the reaction solution becomes turbid. Cool, filter, wash with ethanol, and vacuum dry to obtain the product, antioxidant polytetrahydrofuran ether diol.

[0016] S3. Silane prepolymer: TTZ-PTMEG and decamethyldihydropentasiloxane were dried in a vacuum drying oven at 80°C for 4 hours. Then, TTZ-PTMEG was dissolved in anhydrous toluene under a nitrogen atmosphere. The prepared solution was slowly added dropwise to decamethyldihydropentasiloxane, and an alkaline catalyst was added. The reaction was heated for 4-6 hours until the reaction was complete. After cooling, a small amount of acetic acid was added to neutralize the alkaline catalyst. The mixture was then distilled under reduced pressure, precipitated with a mixed solvent, and dried to obtain the silane prepolymer.

[0017] S4. Alkenyl monosubstituted tetravinyldisiloxane polymer: Under a nitrogen atmosphere, the prepolymer obtained in S3 and 1,3-dimethyltetravinyldisiloxane were dried in a vacuum drying oven at 80°C for 4 hours and dissolved in anhydrous toluene; a catalyst and inhibitor were added, the temperature was gradually increased, and the reaction was completed after 2-3 hours; after cooling, activated carbon was added, and the mixture was stirred and filtered; the filtrate was subjected to vacuum distillation, and the polymer was precipitated with a mixed solvent; the polymer was obtained by filtration, washing, and drying to obtain the alkenyl monosubstituted tetravinyldisiloxane polymer;

[0018] S5. Preparation of antioxidant flexible crosslinking agent by end-capping with alkenyl silane: Under a nitrogen atmosphere, the polymer obtained in S4 and decamethyldihydropentasiloxane were dried in a vacuum drying oven at 80°C for 4 hours and dissolved in anhydrous toluene; a catalyst and inhibitor were added, the temperature was gradually increased, and the reaction was completed after 2-3 hours; the mixture was cooled to room temperature, a small amount of activated carbon was added to adsorb residual platinum, and the mixture was stirred and filtered; the filtrate was subjected to vacuum distillation, and the polymer was precipitated with a mixed solvent. The mixture was filtered, washed, and dried to obtain an antioxidant flexible crosslinking agent with alkenyl end-capped with decamethyldihydropentasiloxane.

[0019] In a specific embodiment, in step S1, the amount of epichlorohydrin is 4 to 4.5 equivalents of polytetrahydrofuran ether diol; the phase transfer catalyst is tetrabutylammonium bromide, and the amount is 0.83 wt% of the feed amount; the amount of NaOH is 1.5 to 2 equivalents of polytetrahydrofuran ether diol.

[0020] In one specific embodiment, in step S2, the amount of triethylamine used is 0.3 to 0.65 equivalents of epoxidized polytetrahydrofuran ether diol; the antioxidant functional component is 2,4-diamino-6-phenyl-1,3,5-triazine, and the amount used is 2 to 2.1 equivalents of epoxidized polytetrahydrofuran ether diol.

[0021] In a specific embodiment, in step S3, the amount of decamethyldihydropentasiloxane used is 2 to 2.1 equivalents of antioxidant polytetrahydrofuran ether diol; the base catalyst is triethylamine, and the amount used is 0.5-1 wt%; the reaction temperature is 100-120°C; and the mixed solvent is n-hexane and ethanol, and the ratio used is 1:1 to 1:5.

[0022] In a specific embodiment, in step S4, the amount of 1,3-dimethyltetravinyldisiloxane is 2 to 2.1 equivalents; the amount of toluene is 10 to 20 wt%; the catalyst is a Karstedt platinum catalyst, and the amount is 1.5 to 5 wt%; the inhibitor is ethynylcyclohexanol, and the amount is 0.1 to 0.5 wt%; the reaction temperature is 80 to 100°C; and the amount of activated carbon is 0.5 to 1 wt%.

[0023] Another object of the present invention is to protect a method for preparing a highly elastic impact-resistant material, comprising the following steps:

[0024] S1. Under vacuum conditions, fumed silica is poured into a kneader, then silicone rubber raw rubber is added, the kneader's exhaust valve and exhaust valve are closed and the mixture is kneaded; during this process, hydroxyl silicone oil, antioxidant flexible crosslinking agent and inhibitor are added in sequence and mixed evenly; the temperature is raised to 130℃ and kneaded for 3 hours, then vacuum kneaded at 100℃ for 2 hours to finish the kneading process, and the silicone rubber masterbatch is obtained after cooling to room temperature.

[0025] S2. Add catalyst, hydrogen-containing silicone oil and antibacterial agent to the masterbatch obtained in S1, mix thoroughly and evenly; then pour into mold, vulcanize in a flat vulcanizing machine at 60-100℃ and 5MPa for 15-30 minutes, and after wiping the edges, obtain a high-elasticity anti-collision material.

[0026] Beneficial effects

[0027] This invention provides a highly elastic anti-collision material and its preparation method. The highly elastic anti-collision material is prepared by placing silicone rubber raw material, an antioxidant flexible crosslinking agent, hydroxyl silicone oil, hydrogen-containing silicone oil, an inhibitor, fumed silica, a catalyst, and an antibacterial agent in a vulcanizing machine. Flexible long-chain polytetrahydrofuran ether diol is introduced into the crosslinking agent. Under stress, the chain segments move, absorbing impact kinetic energy and reducing impact force transmission. Simultaneously, it returns to its original shape after stress relief, effectively improving the material's high elasticity and achieving the purpose of anti-collision protection. The triazine ring in the crosslinking agent can absorb free radicals from ultraviolet light, and its performance remains essentially unchanged after one week of aging, significantly improving the material's antioxidant properties. When placed in rainy or humid environments for one month, the added antibacterial agent polyhexamethylene guanidine can inhibit the generation and growth of bacteria, preventing the formation of bacterial spots or mold. Attached Figure Description

[0028] Figure 1 Synthetic pathway for antioxidant flexible crosslinking agents;

[0029] Figure 2 The image shows the infrared spectrum of the antioxidant flexible crosslinking agent and intermediate in Example 1. Detailed Implementation

[0030] 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.

[0031] Unless otherwise specified, the experimental methods used in the embodiments are conventional methods, and the materials and reagents used are commercially available unless otherwise specified.

[0032] The raw materials used in the examples and comparative examples are described below:

[0033] Flexible segment: Polytetrahydrofuran ether diol (PTMEG), Mn2000, industrial grade, purchased from Jining Huakai Resin Co., Ltd.

[0034] Epichlorohydrin: 98%, product number E808995, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0035] Phase transfer catalyst: Tetrabutylammonium bromide (TBAB), 99%, catalog number T818796, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0036] Isopropyl alcohol (IPA): 99.5%, product number I811925, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0037] Decamethyldihydropentasiloxane: 98%, product number D829485, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0038] 1,3-Dimethyltetravinyldisiloxane: 95%, product number D965023, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0039] Alkali catalyst: Triethylamine (TEA), 99.5%, product number T818774, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0040] Antioxidant functional component: 2,4-diamino-6-phenyl-1,3,5-triazine, 98%, product number D822864, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0041] Catalyst: Karstedt catalyst, Pt content 2%, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0042] Inhibitor: Ethynylcyclohexanol, product code E809391, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0043] Antibacterial agent: Polyhexamethylene guanidine (PHMB); powder, 98%, catalog number BD01919529, purchased from Shanghai Bid Pharmaceutical Technology Co., Ltd.

[0044] Methyl vinyl silicone rubber (MVQ110-0): vinyl content is 0.03-0.06%, purchased from Hoshine Silicon Industry Co., Ltd.

[0045] Methyl vinyl silicone rubber (MVQ110-3): vinyl content is 0.19-0.24%, purchased from Hoshine Silicon Industry Co., Ltd.

[0046] Fumed silica: Grade HP-200, purchased from Jiangxi Hongbai New Materials Co., Ltd.

[0047] Hydroxyl silicone oil: hydroxyl content 8 wt.%, purchased from Wuhan Jiyesheng Chemical Co., Ltd.;

[0048] Hydrogen-containing silicone oil: hydrogen content 1.2 wt.%, Shenzhen Senri Organosilicon Materials Co., Ltd.;

[0049] Hexadecyltrimethoxysilane: 96%, product number H708896, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.;

[0050] Oil phase emulsifier: polylactic acid; product number P921577, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0051] Aqueous emulsifier: Polyvinyl alcohol; Mw9000-10000, item number 767382, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0052] Epoxidized polytetrahydrofuran ether diol (EPTMEG): Prepared in-house, the preparation method is as follows: Under a nitrogen atmosphere, polytetrahydrofuran ether diol (1 equivalent), epichlorohydrin (4.1 equivalents), and tetrabutylammonium bromide (0.83 wt%) are added to a reaction vessel, and the temperature is slowly raised to 60°C and stirred until completely dissolved; 20% NaOH (2 equivalents) solution is slowly added dropwise, and the temperature is raised to 80°C and stirred for 4-6 hours until the reaction ends; the mixture is cooled and allowed to stand for separation, the organic phase is washed with deionized water until neutral, and unreacted epichlorohydrin is removed by vacuum distillation to obtain epoxidized polytetrahydrofuran ether diol;

[0053] Antioxidant polytetrahydrofuran ether diol (TTZ-PTMEG): Prepared in-house, the preparation method is as follows: Dissolve EPTMEG (1 equivalent) in anhydrous isopropanol, add triethylamine (0.58 equivalent), purge with nitrogen, and add the antioxidant functional component 2,4-diamino-6-phenyl-1,3,5-triazine (2.05 equivalent) in batches. Heat to 70°C and stir to dissolve. React for 6 hours until the reaction solution becomes turbid. Cool, filter, wash with ethanol, and vacuum dry to obtain the product, antioxidant polytetrahydrofuran ether diol.

[0054] Antioxidant flexible crosslinking agent (TTZ-PTMEG-Si): self-made, preparation method is as follows:

[0055] S1. Silane-hydrosiloxane prepolymer:

[0056] TTZ-PTMEG (1 equivalent) and decamethyldihydropentasiloxane (2.02 equivalent) were dried in a vacuum drying oven at 80°C for 4 hours. Then, TTZ-PTMEG was dissolved in anhydrous toluene (50 wt%) under a nitrogen atmosphere. The prepared solution was slowly added dropwise to decamethyldihydropentasiloxane, followed by the addition of a basic catalyst (0.5 wt%) of triethylamine. The reaction was carried out at 110°C for 4–6 hours until the reaction was complete. After cooling to room temperature, a small amount of acetic acid was added to neutralize the basic catalyst. The solvent was removed by vacuum distillation, and the residue was precipitated with a hexane / ethanol mixed solvent to remove unreacted monomers and impurities. Finally, the residue was dried to obtain the silane prepolymer.

[0057] S2. Modified tetravinyldisiloxane

[0058] The prepolymer (1 equivalent) obtained in S1 and 1,3-dimethyltetravinyldisiloxane (2.05 equivalent) were dried in a vacuum drying oven at 80°C for 4 hours and dissolved in anhydrous toluene (15 wt%). Nitrogen gas was introduced and the mixture was stirred until dissolved. A platinum catalyst (1.6 wt%) and an inhibitor ethynylcyclohexanol (0.1 wt%) were added, and the temperature was gradually increased to 100°C. The reaction was completed after 2-3 hours. The mixture was cooled to room temperature, and a small amount of activated carbon (0.5 wt%) was added to adsorb residual platinum. The mixture was stirred for 30 minutes and then filtered. The filtrate was subjected to vacuum distillation to remove the solvent, and then dissolved in n-hexane. Ethanol was slowly added dropwise to precipitate the polymer. The mixture was filtered and the filter cake was washed with ethanol to remove small molecules that had not reacted. Finally, the mixture was dried to obtain an alkenyl monosubstituted tetravinyldisiloxane polymer.

[0059] S3. Preparation of antioxidant flexible crosslinking agent by end-capping with alkenyl silane-hydrosiloxane

[0060] The polymer (1 equivalent) obtained from S2 and decamethyldihydropentasiloxane (6.05 equivalent) were dried in a vacuum drying oven at 80°C for 4 hours and dissolved in anhydrous toluene (15 wt%). Nitrogen gas was introduced and the mixture was stirred until dissolved. A platinum catalyst (1.6 wt%) and an inhibitor, etynylcyclohexanol (0.1 wt%), were added, and the temperature was gradually increased to 100°C. The reaction was completed after 2-3 hours. The mixture was cooled to room temperature, and a small amount of activated carbon (0.5 wt%) was added to adsorb residual platinum. The mixture was stirred for 30 minutes and then filtered. The filtrate was subjected to vacuum distillation to remove the solvent, and then dissolved in n-hexane. Ethanol was slowly added dropwise to precipitate the polymer. The mixture was filtered and the filter cake was washed with ethanol to remove small molecules that had not reacted. Finally, the mixture was dried to obtain an antioxidant flexible crosslinking agent with alkenyl groups capped by decamethyldihydropentasiloxane.

[0061] Antioxidant crosslinking agent (TTZ--Si): self-made. The preparation method is different from that of the antioxidant flexible crosslinking agent in that the antioxidant functional component used is not incorporated into the flexible segment polytetrahydrofuran ether diol.

[0062] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0063] Examples and Comparative Examples

[0064] A highly elastic impact-resistant material, the weight parts of which are shown in Table 1, is prepared by the following method:

[0065] S1. Under vacuum conditions, filler fumed silica is poured into a kneader, and then two types of silicone rubber raw materials, MVQ110-0 and MVQ110-3, are slowly added. The kneader's exhaust valve and exhaust valve are closed and the mixture is kneaded. During this process, hydroxyl silicone oil, antioxidant flexible crosslinking agent, and inhibitor are added in sequence and stirred thoroughly. The mixture is heated to 130°C and kneaded for 3 hours, and then vacuum kneaded at 100°C for 2 hours. After the mixing is completed, the silicone rubber masterbatch is obtained after cooling to room temperature.

[0066] S2. Add catalyst, hydrogen-containing silicone oil and antibacterial agent to the masterbatch obtained in S1, mix thoroughly and evenly; then pour into a mold, vulcanize for 20 minutes at 60℃ and 5MPa in a flat vulcanizing machine, and after cleaning the edges, obtain a high-elasticity anti-collision material.

[0067] Table 1. A type of highly elastic impact-resistant material (parts by weight)

[0068]

[0069] The highly elastic anti-collision material prepared in the examples and comparative examples was subjected to the following performance tests, and the results are shown in the figure, table 2 and table 3 respectively.

[0070] 1. Infrared Spectroscopy: Intermediates and an antioxidant flexible crosslinking agent were mixed with potassium bromide at a ratio of 1:50 to prepare tablets. An Avatar 380 spectrometer was used for this test. Before testing, a blank background was scanned, followed by the placement of the tableted sample for analysis. The scanning range was 500-4000 cm⁻¹. -1 The result is as follows Figure 2 As shown.

[0071] 2. Mechanical property testing: Hardness testing was conducted using a Shore hardness tester according to the national standard ISO 7619-1-2004; tensile strength and elongation at break were tested using a universal testing machine according to ISO 37-2005 and ISO 34-1-2004 standards respectively. The silicone rubber sheet was neatly clamped at both ends on a tensile testing machine, the tensile speed was set to 50 mm / min, and the stress-strain curves were recorded in real time until the silicone rubber sheet broke.

[0072] 3. Compression set: A cylindrical silicone rubber sample with a height of approximately 10 cm (±0.3) mm was prepared according to GB / T 1683-2018 "Determination of compression set of vulcanized rubber with constant deformation". The silicone rubber sample was installed in a fixture and compressed to 30%. The test conditions were 90℃ and 90% humidity. After each selected interval, the silicone rubber sample was removed and the fixture was released. After standing at room temperature for one hour, the height was measured and the measurement data were recorded.

[0073] 4. Anti-aging properties: Take a silicone rubber sheet cut to 1×1×0.22cm and place it in a UV aging test chamber. Set the temperature to room temperature and humidity to 55%. After irradiation for one week, measure the percentage decrease in performance.

[0074] 5. Antibacterial performance: Take a silicone rubber sheet cut to 1×1×0.22cm and place it in a dry petri dish. Expose it to a dark and humid environment for one month and observe whether bacterial spots or mold grow on the surface of the silicone rubber sheet to test the antibacterial performance.

[0075] Table 2 Performance test results of highly elastic impact-resistant materials

[0076]

[0077] Table 3 Compression Permanent Deformation Rate of Highly Elastic Impact-Proof Materials

[0078]

[0079] From the appendix Figure 2 It can be seen that in the spectrum of A, the peak appears at 2980-2850 cm⁻¹. -1 The stretching vibrations, attributed to CH2, peak at 1120 cm⁻¹. -1 The stretching vibrations attributed to COC peak at 910 cm⁻¹. -1 The characteristic absorption peaks attributed to ethylene oxide, and at 3000 cm⁻¹ -1 The absence of an absorption peak belonging to the -OH group previously indicates successful modification of ethylene oxide into polytetrahydrofuran ether diol. In the spectrum of B, the peak is at 3502 cm⁻¹. -1 -3200cm -1 The characteristic absorption signals attributed to -OH and -NH2 on the triazine ring peak at 1675-1500 cm⁻¹. -1 The peaks are attributed to the C=N vibration on the triazine ring, and the disappearance of the epoxy peak indicates that the triazine ring successfully opened the epoxy group to modify the polytetrahydrofuran ether diol. In the C spectrum, the peak appears at 2300-2100 cm⁻¹. -1 The stretching vibrations of Si-H on decamethyldihydropentasiloxane are at 1255 cm⁻¹. -1 The nearby peaks represent the stretching vibrations of Si-C, indicating the introduction of decamethyldihydropentasiloxane onto the triazine ring. In the D spectrum, the absorption signal belonging to Si-H disappears, and a peak belonging to C=C appears at 1675 cm⁻¹. -1 This indicates that Si-H reacts with the double bond. In the E spectrum, at 1675 cm⁻¹... -1 The nearby peak signal weakened, and the Si-H signal reappeared. It also possessed the characteristic groups of the three raw materials: polytetrahydrofuran ether diol, triazine ring, and decamethyldihydropentasiloxane, proving that the antioxidant flexible crosslinking agent had been successfully copolymerized.

[0080] As can be seen from Table 2, with the increase of the content of the added antioxidant flexible crosslinking agent, the hardness and tensile strength of the prepared high-elasticity impact-resistant material gradually increase; while the elongation at break shows the opposite trend. Since there is a flexible segment polytetrahydrofuran ether diol in the crosslinking agent, compared with Comparative Example 1, which uses a more rigid hydrogen-containing silicone oil to replace the crosslinking agent prepared in this invention, Examples 1-5 have lower hardness and are more flexible, and the elongation at break is also greater, indicating that it has better flexibility and the segments can move fully to give the material good elasticity. At the same time, it can also be seen from the comparative examples and examples that the triazine ring gives the material better anti-aging properties, and the antibacterial agent can effectively deal with bacterial growth caused by rain and humidity.

[0081] As can be seen from Table 3, after 9 days of testing, the compression deformation rate of the prepared high-elasticity anti-collision material was less than 0.25%, which is smaller than the control ratio, indicating that the crosslinking agent of the present invention can impart good elasticity to the material.

[0082] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A highly elastic anti-collision material, comprising, by weight, the following components: 56-93 parts of raw silicone rubber, 3-6 parts of an antioxidant flexible crosslinking agent, 1-5 parts of hydroxyl silicone oil, 0.1-1.5 parts of a catalyst, 0.1-0.5 parts of an inhibitor, 0.01-1 parts of hydrogen-containing silicone oil, 15-40 parts of fumed silica, and 0.1-0.5 parts of an antibacterial agent; the structural formula of the antioxidant flexible crosslinking agent is shown in Formula 1:

2. The highly elastic impact-resistant material as described in claim 1, characterized in that, The antioxidant flexible crosslinking agent is prepared by the following steps: S1. Under a nitrogen atmosphere, polytetrahydrofuran ether diol, epoxide bromide and phase transfer catalyst are added to a reaction vessel and the temperature is slowly raised to 50-70°C; NaOH solution is added dropwise, the temperature is raised to 70-90°C and the reaction is stirred for 4-6 hours until the reaction ends, and the epoxide polytetrahydrofuran ether diol is obtained by separation and purification. S2. Dissolve epoxidized polytetrahydrofuran ether diol in anhydrous isopropanol, add triethylamine, purge with nitrogen, and add antioxidant functional components in batches. Heat to 60-80°C and stir to dissolve. React for 4-8 hours until the reaction solution becomes turbid. Separate and purify to obtain the product antioxidant polytetrahydrofuran ether diol. S3. The antioxidant polytetrahydrofuran ether diol and decamethyldihydropentasiloxane were pre-dried, and then the antioxidant polytetrahydrofuran ether diol was dissolved in anhydrous toluene under a nitrogen atmosphere; then it was slowly added dropwise to decamethyldihydropentasiloxane, and then an alkaline catalyst was added. The reaction was heated for 4-6 hours until the reaction was completed; the silane prepolymer was separated and purified. S4. Under a nitrogen atmosphere, the prepolymer obtained in S3 and 1,3-dimethyltetravinyldisiloxane were dried and dissolved in anhydrous toluene; a catalyst and an inhibitor were added, the temperature was gradually increased, and the reaction was completed after 2-3 hours; the alkenyl monosubstituted tetravinyldisiloxane polymer was obtained by separation and purification. S5. Under a nitrogen atmosphere, the polymer obtained in S4 and decamethyldihydropentasiloxane were dried and dissolved in anhydrous toluene; a catalyst and an inhibitor were added, the temperature was gradually increased, and the reaction was completed after 2-3 hours; the antioxidant flexible crosslinking agent with alkenyl groups capped by decamethyldihydropentasiloxane was obtained by separation and purification.

3. The highly elastic impact-resistant material as described in claim 2, characterized in that, In step S1, the amount of epichlorohydrin is 4 to 4.5 equivalents of polytetrahydrofuran ether diol; the phase transfer catalyst is tetrabutylammonium bromide, and the amount is 0.83 wt% of the feed amount; the amount of NaOH is 1.5 to 2 equivalents of polytetrahydrofuran ether diol.

4. The highly elastic impact-resistant material as described in claim 2, characterized in that, In step S2, the amount of triethylamine used is 0.3 to 0.65 equivalents of epoxidized polytetrahydrofuran ether diol; the antioxidant functional component is 2,4-diamino-6-phenyl-1,3,5-triazine, and the amount used is 2 to 2.1 equivalents of epoxidized polytetrahydrofuran ether diol.

5. The highly elastic impact-resistant material as described in claim 2, characterized in that, In step S3, the amount of decamethyldihydropentasiloxane used is 2 to 2.1 equivalents of antioxidant polytetrahydrofuran ether diol; the base catalyst is triethylamine, and the amount used is 0.5-1 wt%; the reaction temperature is 100-120°C; the mixed solvent is n-hexane and ethanol, and the ratio used is 1:1 to 1:

5.

6. The highly elastic impact-resistant material as described in claim 2, characterized in that, In step S4, the amount of 1,3-dimethyltetravinyldisiloxane used is 2 to 2.1 equivalents; the amount of toluene used is 10 to 20 wt%; the catalyst is Karstedt platinum catalyst, used in an amount of 1.5 to 5 wt%; the inhibitor is ethynylcyclohexanol, used in an amount of 0.1 to 0.5 wt%; and the reaction temperature is 80 to 100°C.

7. The highly elastic impact-resistant material as described in claim 1, characterized in that, The raw silicone rubber is methyl vinyl silicone rubber, the inhibitor is ethynylcyclohexanol, the catalyst is Karstedt platinum catalyst, and the antibacterial agent is polyhexamethylene guanidine antibacterial agent.

8. A method for preparing a highly elastic impact-resistant material according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Under vacuum conditions, fumed silica is poured into a kneader, then silicone rubber raw rubber is added, the kneader's exhaust valve and exhaust valve are closed and the mixture is kneaded; during this process, hydroxyl silicone oil, antioxidant flexible crosslinking agent and inhibitor are added in sequence and mixed evenly; the temperature is raised to 130℃ and kneaded for 3 hours, then vacuum kneaded at 100℃ for 2 hours to finish the kneading process, and the silicone rubber masterbatch is obtained after cooling to room temperature. S2. Add catalyst, hydrogen-containing silicone oil and antibacterial agent to the masterbatch obtained in S1, mix thoroughly and evenly; then pour into mold, vulcanize in a flat vulcanizing machine at 60-100℃ and 5MPa for 15-30 minutes, and after wiping the edges, obtain a high-elasticity anti-collision material.

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