Environment-friendly single-component silica gel material as well as preparation method and 3D printing application thereof

Abstract

The invention relates to the field of silicone rubber, in particular to an environment-friendly single-component silicone rubber material, a preparation method of the environment-friendly single-component silicone rubber material and 3D printing application of the environment-friendly single-component silicone rubber material. 4-10% of hydrogen-containing silicone oil; 20-30% of a filling material; 0.01 to 0.1 percent of cyclohexanol; 0.1 to 0.4% of a platinum complex; 3-10% of a silazane composite material; the sum of the weight percentages of the vinyl silicone oil, the hydrogen-containing silicone oil, the fumed silica, the cyclohexanol, the platinum complex and the silazane composite material is equal to 100%; the silazane composite material comprises silazane, double-end epoxy polyether silicone oil and an amino-containing silane compound; the silazane, the double-end epoxy polyether silicone oil and the amino-containing silane compound in the silazane composite material have a synergistic effect, the dispersion compatibility of the raw materials is optimized, sedimentation and agglomeration of the filler are avoided, the binding force of the filler and a base material is enhanced, and the structural stability of a printed piece is improved.

Description

Technical Field

[0001] This application relates to the field of silicone rubber, and more specifically, to an environmentally friendly one-component silicone rubber compound, its preparation method, and its 3D printing applications. Background Technology

[0002] Based on their curing systems, silicone materials can be mainly divided into two types: single-component and two-component, each with its own characteristics in industrial applications. Currently, silicone materials are widely used in electronic sealing, automotive parts, medical devices, and many other fields due to their excellent high and low temperature resistance, electrical insulation, and chemical stability.

[0003] Especially in fields like new energy vehicles where lightweighting and structural integrity are paramount, silicone materials combined with foaming technology can be used to fabricate a variety of lightweight components. Currently, 3D printing technology is gradually being applied to the development and manufacturing of these components. While the range of materials available is expanding, there are still limitations in direct 3D printing with silicone. In the trial production of components for new energy vehicles, a composite process using 3D-printed prototypes and silicone molds has emerged: first, a prototype with a hollow honeycomb structure is created using 3D printing; then, a silicone mold process is used to ensure the surface accuracy of the component, thus balancing lightweighting and mechanical strength. For example, some new energy vehicle manufacturers have adopted this process in the trial production of battery boxes, car seat cushions, and floor mats, achieving significant technical advantages such as weight reduction and increased compressive strength compared to existing designs.

[0004] However, when using existing silicone materials directly for 3D printing of new energy vehicle parts, problems such as insufficient printing accuracy and unstable performance of the molded parts still exist, which require further research. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical problems and provide an environmentally friendly single-component silicone material, its preparation method, and its 3D printing application.

[0006] Firstly, an environmentally friendly single-component silicone material is composed of the following raw materials by weight percentage: Vinyl silicone oil 51-73%; Hydrogen-containing silicone oil 4-10%; Filler 20-30%; Cyclohexanol 0.01-0.1%; Platinum complex 0.1-0.4%; 3-10% silazane composite material; The sum of the weight percentages of the vinyl silicone oil, hydrogen-containing silicone oil, fumed silica, cyclohexanol, platinum complex, and silazane composite material is equal to 100%. The silazane composite material includes silazane, double-ended epoxy polyether silicone oil, and amino-containing silane complex.

[0007] The above-mentioned technical solution offers advantages such as precise control of reaction curing efficiency and ensuring the accuracy of 3D printing. Specifically, this application uses a single-component silicone material that is solvent-free, low-volatile, and environmentally friendly. Cyclohexanol and platinum complexes form a synergistic catalytic system. The platinum complexes efficiently initiate the crosslinking reaction between vinyl silicone oil and hydrogen-containing silicone oil. Cyclohexanol regulates the catalyst activity to precisely control the curing rate, avoiding excessively rapid curing that could lead to nozzle clogging and poor interlayer bonding, and preventing excessively slow curing that could cause deformation and structural collapse of the printed parts. This ensures that each layer of material in the 3D printing is set within a preset time, improving the accuracy of complex structure forming and reducing dimensional deviations and structural defects. Simultaneously, the material dispersion compatibility is optimized, enhancing the stability of the printed structure.

[0008] In silazane composites, silazane forms a modified layer on the surface of filler particles, reducing interfacial tension with the matrix. Double-ended epoxy polyether silicone oil improves the uniformity of filler dispersion, preventing sedimentation and agglomeration. The amine groups in the amino-containing silane composite chemically bond with the surface groups of the filler, enhancing the bonding force with the matrix and preventing loose structures and interlayer delamination in the printed parts. Vinyl silicone oil and hydrogen-containing silicone oil provide a good mechanical foundation for the printed parts, meeting the requirements of new energy vehicle components. The silazane composite, in synergy with other raw materials, improves printing accuracy, and the 3D-printed products possess excellent mechanical strength and structural stability to meet the requirements of new energy vehicle components.

[0009] Preferably, the weight ratio of the silazane, the double-ended epoxy polyether silicone oil, and the amino-containing silane complex is 10:(5-8):(2-5).

[0010] This environmentally friendly single-component silicone material is composed of vinyl silicone oil, hydrogen-containing silicone oil, filler, cyclohexanol, platinum complex, and silazane composite. It allows for precise control of reaction curing efficiency, ensuring 3D printing molding accuracy, optimizing raw material dispersion compatibility, improving the stability of printed structures, strengthening basic performance and expansion capabilities, and enhancing overall application value. By mixing silazane, double-ended epoxy polyether silicone oil, and amino-containing silane composite in a weight ratio of 10:(5-8):(2-5), the three components can better exert a synergistic effect, further improving the performance of the silicone material.

[0011] Preferably, the silazane is triethylenetrimethylcyclotrisilazane and / or hexaphenylcyclotrisilazane.

[0012] The vinyl group in triethylenetrimethylcyclotrisilazane can synergistically crosslink with vinyl silicone oil, while the methyl group reduces the surface polarity of the filler and decreases the interfacial tension between the filler and the matrix, enabling the filler to achieve nanoscale uniform dispersion in the silicone system. The benzene ring substituents in hexaphenylcyclotrisilazane have a steric hindrance effect, forming a three-dimensional protective layer on the surface of the filler particles, hindering the mutual adsorption between particles. Its aromatic ring structure has excellent compatibility with the molecular chains of the matrix, improving the uniformity of the material system. Using these two materials alone or in combination can make the rheological properties of the material more stable during 3D printing, precisely controllable nozzle output, and reduce the forming error of complex hollow honeycomb structures. This improves printing accuracy compared to conventional silazanes. Furthermore, their structural characteristics allow for more efficient synergistic effects with other raw materials, achieving breakthrough improvements in filler dispersion uniformity, interfacial bonding strength, and environmental aging resistance. This further addresses the problems of insufficient printing accuracy and poor mechanical property stability in existing technologies, making silicone materials more suitable for the stringent requirements of key components in new energy vehicles.

[0013] Preferably, the amino-containing silane complex is a combination of one or more of vinylbenzylaminotrimethoxysilane hydrochloride, bis(3-trimethoxysilylpropyl)amine, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, and linear hydroxyl-terminated polydimethylsiloxane, and at least one of them is bis(3-trimethoxysilylpropyl)amine.

[0014] By adopting the above technical solution, this composite material, through a synergistic design of "core component dominance + auxiliary component reinforcement," forms a targeted adaptation system with silazane and dual-terminated epoxy polyether silicone oil, precisely solving problems such as "weak layer structure bonding, insufficient printing accuracy, and poor mechanical property stability" in existing technologies. Bis(3-trimethoxysilylpropyl)amine and linear hydroxyl-terminated polydimethylsiloxane synergistically optimize the rheological properties of the system; with bis(3-trimethoxysilylpropyl)amine as the core, its bissiloxane groups and the surface modification effect of silazane form a "double coating-crosslinking" effect, preventing particle adsorption and agglomeration. Combined with the electrostatic repulsion effect of vinylbenzylaminotrimethoxysilane hydrochloride, it reduces filler sedimentation and provides overall performance after 3D printing.

[0015] In addition, the three-dimensional network of "silazane-aminosilane-filler" constructed by bis(3-trimethoxysilylpropyl)amine enhances the interfacial bonding strength between the filler and the matrix; the diamine groups of N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane form multiple crosslinking points, which, together with the flexible buffer layer of linear hydroxyl-terminated polydimethylsiloxane, improve the interlayer peel strength and reduce the occurrence of cracks.

[0016] This amino-containing silane composite, with bis(3-trimethoxysilylpropyl)amine as its core, achieves breakthroughs in dispersion stability, printing accuracy, structural stability, and aging resistance through the synergistic effect with other components. It not only meets the rheological requirements of silicone materials in 3D printing processes, but also solves the key problems of insufficient molding accuracy and large performance fluctuations in lightweight components for new energy vehicles in existing technologies, providing core technical support for the large-scale application of silicone materials in the manufacturing of precision components for new energy vehicles.

[0017] Preferably, the amino-containing silane complex is composed of vinylbenzylaminotrimethoxysilane hydrochloride, bis(3-trimethoxysilylpropyl)amine, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, and linear hydroxyl-terminated polydimethylsiloxane.

[0018] By adopting the above technical solutions, the synergistic effect of the quaternary compound and the double-ended epoxy polyether silicone oil significantly improves the dispersion uniformity and long-term stability of the filler in the system, avoids agglomeration and sedimentation, and ensures a continuous and smooth printing process. The synergistic optimization of rheological properties and curing characteristics makes the silicone material suitable for 3D printing process requirements, with uniform dispensing and precise shaping, enabling high-quality molding of complex hollow structures. The integrated cross-linked network gives the printed parts both high strength and high toughness, stable mechanical properties, and the ability to maintain structural and performance stability in extreme environments. The combination of these four elements with the weather resistance of the double-ended epoxy polyether silicone oil forms a multi-dimensional comprehensive protection system, suitable for the complex service scenarios of new energy vehicles.

[0019] Preferably, the viscosity of the linear hydroxyl-terminated polydimethylsiloxane is 100-1000 mPa·s.

[0020] By adopting the above technical solutions, the reaction curing efficiency is precisely controlled, ensuring the accuracy of 3D printing and avoiding problems such as nozzle clogging and poor interlayer bonding caused by excessively rapid curing. It also prevents deformation and structural collapse of printed parts caused by excessively slow curing. Optimizing the dispersion and compatibility of raw materials improves the stability of the printed structure, preventing sedimentation and agglomeration of fillers due to density differences, ensuring the uniformity of the material system during 3D printing, and preventing loose structures and interlayer delamination due to component separation after printing. Strengthening basic performance and expansion enhances comprehensive use value, providing a good mechanical foundation for printed parts and improving their compressive strength and wear resistance. Simultaneously, the viscosity of linear hydroxyl-terminated polydimethylsiloxane is 100-1000 mPa·s, which can adjust the system's basic viscosity and synergistically enhance the shear thinning effect, achieving "easy flow and rapid, stable shaping" printing characteristics. Combined with improved curing uniformity, this ensures accurate molding of complex structures. Strengthening low-temperature toughness, it combines with other components to form a multi-dimensional comprehensive protection system, suitable for the complex service scenarios of new energy vehicles.

[0021] Preferably, the vinyl silicone oil is one or a combination of more than one of vinyl-terminated silicone oil, side-chain vinyl silicone oil, and vinyl phenyl silicone oil.

[0022] By adopting the above technical solution, using one or more of vinyl-terminated silicone oil, side-chain vinyl silicone oil, and vinyl phenyl silicone oil as vinyl silicone oil, and hydrogen-containing silicone oil as the base material, the excellent molecular chain flexibility and cross-linking reactivity provide a good mechanical basis for the printed parts, such as tensile strength and elongation at break, which is suitable for the impact resistance and fatigue resistance requirements of new energy vehicle parts.

[0023] Preferably, the filler is one or more of the following: fumed silica, precipitated silica, alumina, boron nitride, graphene, talc, and carbon nanotubes.

[0024] All of the above fillers serve a filling and reinforcing function. When fumed silica, boron nitride, and carbon nanotubes are compounded, they provide better thermal conductivity and reinforcement, and are used in the production of thermally conductive new energy vehicle parts.

[0025] Secondly, an environmentally friendly single-component silicone material preparation method is obtained by the following method: Step 1: Dissolve the amino-containing silane complex in a solvent by weight percentage, then mix it evenly with the filler, remove the solvent, and obtain mixture A; mix the silazane and the double-ended epoxy polyether silicone oil evenly to obtain mixture B; Step 2: Weigh out the vinyl silicone oil, platinum complex and all of mixture B by weight percentage, mix them evenly, then add the hydrogen-containing silicone oil and mix evenly. Finally, add all of mixture A and mix evenly to obtain environmentally friendly single-component silicone material.

[0026] Mixture A is prepared by dissolving an amino-containing silane complex in a solvent according to a weight percentage, grinding it with the filler, and removing the solvent. Mixture B is prepared by mixing silazane and double-ended epoxy polyether silicone oil. Vinyl silicone oil and platinum complex are weighed according to a weight percentage and mixed with mixture B. Hydrogen-containing silicone oil is added, followed by mixture A, and the mixture is stirred evenly to obtain an environmentally friendly single-component silicone material. This process ensures that the raw materials are fully mixed and reacted according to the specified ratio and sequence, allowing the components in the silicone material to exert a synergistic effect, precisely controlling the reaction curing efficiency, and ensuring the molding accuracy of 3D printing. It also optimizes the dispersion compatibility of raw materials, improves the stability of printed structures, strengthens basic performance and expands the overall use value, and prepares an environmentally friendly single-component silicone material suitable for 3D printing processes, meeting the requirements for large-scale application of key components in new energy vehicles.

[0027] Thirdly, an application of an environmentally friendly single-component silicone material in 3D printing: using an environmentally friendly single-component silicone material in 3D printing to produce lightweight parts for new energy vehicles.

[0028] It can precisely control the reaction curing efficiency, ensuring the accuracy of 3D printing and avoiding problems such as nozzle clogging and poor interlayer bonding caused by excessively rapid curing. It also prevents deformation and structural collapse of printed parts caused by excessively slow curing, improving the molding accuracy of complex structures and reducing dimensional deviations and structural defects. It optimizes the dispersion and compatibility of raw materials, improves the stability of printed structures, and avoids problems such as filler sedimentation, agglomeration, loose structure, and interlayer delamination after printing. It strengthens basic performance and expansion, enhances comprehensive use value, provides a good mechanical foundation for printed parts, makes the mechanical strength, structure and other properties of printed parts more stable, improves the safety of new energy vehicle components, and meets the requirements for large-scale application of key components in new energy vehicles.

[0029] In summary, this application includes at least one of the following beneficial technical effects: 1. Cyclohexanol and platinum complex form a synergistic catalytic system, which can precisely control the curing rate and avoid problems such as nozzle clogging, poor interlayer bonding, deformation of printed parts, and structural collapse, thereby improving the accuracy of complex structure forming and reducing dimensional deviations and structural defects. 2. The synergistic effect of silazane, double-ended epoxy polyether silicone oil, and amino-containing silane complex in silazane composite material optimizes the dispersion and compatibility of raw materials, avoids filler sedimentation and agglomeration, enhances the bonding force between filler and matrix material, and improves the structural stability of printed parts. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the embodiments.

[0031] Introduction to some raw materials: The particle sizes of fumed silica, boron nitride, and carbon nanotubes are all less than 100 nm; the carbon nanotubes are single-walled carbon nanotubes. Vinylphenyl silicone oil is methylphenyl vinyl silicone oil, CAS No.: 68951-96-2; The vinyl-terminated silicone oil is vinyl-terminated dimethylpolysiloxane, CAS No.: 68083-19-2; Hexaphenylcyclotrisilazane, CAS No.: 4570-25-6; Molecular formula of vinylbenzylaminotrimethoxysilane hydrochloride: C 17 H 30 N2O3Si.HCl; Linear hydroxyl-terminated polydimethylsiloxane, brand IOTA, model IOTA 107V500-V3000; low viscosity RTV107 adhesive; viscosity at 25℃ is 500 mPa·s; Bis(3-trimethoxysilylpropyl)amine, CAS No.: 82985-35-1; The platinum complex is diethylenetetramethyldisiloxane platinum complex, brand name and model IOTA IOTA-8100. Example

[0032] Example 1 An environmentally friendly one-component silicone material is obtained by the following method: Step 1: Dissolve the aminosilane complex in a solvent (anhydrous ethanol) by weight percentage, then mix it with the filler (fumed silica) in a planetary mixer for 30 minutes at a stirring speed of 180 rpm. Then place it in a vacuum dryer and heat it to 80°C until all the solvent is removed to obtain mixture A; mix the silazane and the double-ended epoxy polyether silicone oil evenly to obtain mixture B. Step 2: Weigh out the vinyl silicone oil (composed of vinyl-terminated silicone oil and vinyl phenyl silicone oil in a weight ratio of 3:1), platinum complex, cyclohexanol, and all of mixture B according to weight percentage, and put them into a stirring device. Stir at 200 rpm for 10 minutes to make it evenly mixed. Then add the hydrogen-containing silicone oil and continue stirring for 10 minutes to make it evenly mixed. Finally, add all of mixture A and continue stirring for 30 minutes to make the materials fully mixed and evenly mixed to obtain environmentally friendly single-component silicone material.

[0033] The specific amounts of the above raw materials are shown in Table 1.

[0034] Example 2-3 The difference between Examples 2-3 and Example 1 is that the amount of raw materials used is different, as shown in Table 1. Table 1. Raw material usage (by weight percentage) for Examples 1-3 Example

[0035] The difference between Example 4 and Example 1 is that the amino-containing silane complex is composed of vinylbenzylaminotrimethoxysilane hydrochloride and bis(3-trimethoxysilylpropyl)amine in a weight ratio of 1:4.

[0036] Example 5 The difference between Example 5 and Example 1 is that the amino-containing silane complex is composed of bis(3-trimethoxysilylpropyl)amine, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, and linear hydroxyl-terminated polydimethylsiloxane in a weight ratio of 1:1.

[0037] Example 6 The difference between Example 6 and Example 1 is that the amino-containing silane complex is composed of vinylbenzylaminotrimethoxysilane hydrochloride, bis(3-trimethoxysilylpropyl)amine, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, and linear hydroxyl-terminated polydimethylsiloxane in a weight ratio of 1:2:2.

[0038] Example 7 The difference between Example 7 and Example 6 is that the silazane is composed of triethylenetrimethylcyclotrisilazane and hexaphenylcyclotrisilazane in a weight ratio of 1:4.

[0039] Example 8 The difference between Example 8 and Example 6 is that the filler in Example 8 consists of fumed silica, boron nitride, and carbon nanotubes in a weight ratio of 10:5:10. The environmentally friendly single-component silicone material obtained in Example 1 is suitable for 3D printing lightweight components for new energy vehicles requiring high heat dissipation.

[0040] Comparative Example

[0041] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the double-ended epoxy polyether silicone oil is replaced with an equal amount of silazane.

[0042] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the amino-containing silane complex is replaced with an equal amount of silazane.

[0043] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the double-ended epoxy polyether silicone oil and the amino-containing silane complex are replaced with silazane in equal amounts.

[0044] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that silazane, double-ended epoxy polyether silicone oil, and amino-containing silane complex are all replaced with hexamethyldisilazane in equal amounts.

[0045] Application examples Application Example 1 An application of an environmentally friendly single-component silicone material in 3D printing was described. The environmentally friendly single-component silicone material obtained in Example 1 was printed using a 3D printer. Printing parameters were: nozzle 0.8mm, speed 50mm / s, pressure 0.4MPa, barrel temperature 25℃, ambient temperature 60℃, layer height 0.3mm, and a honeycomb hexagonal mesh path. The structural features were: 60% void ratio, wall thickness 1.0mm, aperture 3mm, and height 5cm. Curing conditions were as follows: pre-curing was performed by heating from 60℃ to 130℃ at a rate of 5℃ / min, followed by a hold time of 3min; post-curing was performed by heating from 130℃ to 150℃ at a rate of 5℃ / min, followed by a hold time of 5min. This resulted in lightweight components for new energy vehicles.

[0046] Application Example 2-12 The difference between Application Example 2-12 and Application Example 1 is that the source of the environmentally friendly single-component silicone material is different, as shown in Table 2. Table 2 Application Examples 1-12 Sources of Environmentally Friendly Single-Component Silicone Compounds

[0047] Performance testing Experiment 1) Structural Stability The lightweight new energy vehicle component obtained from Application Examples 1-12 was sampled with a height of 5cm, a width of 20cm, and a length of 20cm. It was placed horizontally, and pressure was applied to the surface until the height was reduced to 2.5cm. The humidity was maintained at 60% and the temperature at 100℃ for 3 days. After removing the pressure, it was placed in an environment with a temperature of 25℃ and a humidity of 60% for 24 hours. Then, it was placed on the test platform of an infrared measuring instrument, and the height was measured at 5 random locations. The average height was recorded as A. The retention rate was calculated by dividing A by 5cm and then multiplying by 100%.

[0048] Experiment 2) Mechanical Properties 2-1) Tensile strength and elongation at break were tested in accordance with ISO 37-2024. The sample preparation process adopted the printing method in Application Example 1 and combined with the sample standard of ISO 37-2024 to print a type 1 dumbbell-shaped sample in this method. The sample was then placed in an environment with a temperature of 25°C and a humidity of 60% for 2 hours before the test was conducted. The test temperature was 25°C, the relative humidity was 50%, and the tensile rate was 500 mm / min. Tensile strength and elongation at break were tested. The mechanical properties were considered qualified only when the tensile strength was >20 MPa and the elongation at break was >500%. Otherwise, the mechanical properties were considered unqualified.

[0049] 2-2) Tensile strength and elongation at break were tested according to ISO 37-2024. Sample preparation process: Environmentally friendly single-component silicone material was injected into a mold, and then the mold was placed in a flat vulcanizing machine. Vulcanization was carried out for 5 minutes at a pressure of 15 MPa and a temperature of 150℃. After cooling to room temperature (25℃), the mold was removed and placed in an environment with a temperature of 25℃ and a humidity of 60% for 2 hours to obtain type 1 dumbbell-shaped samples. Tensile strength and elongation at break were tested at a test temperature of 25℃, a relative humidity of 50%, and a tensile rate of 500 mm / min. The similarity rate of mechanical properties in 2-2) and 2-1) was calculated. The similarity rate is equal to the mechanical property in 2-1) divided by the mechanical property in 2-1), and then multiplied by 100%. Taking tensile strength as an example, the similarity rate is equal to the tensile strength in 2-1) divided by the tensile strength in 2-1), and then multiplied by 100%. The higher the similarity rate, the more stable the structure formed by the environmentally friendly single-component silicone material after 3D printing.

[0050] Calculate the average similarity rate between tensile strength and elongation at break. The evaluation level of this average similarity rate is as follows: similarity rate ≥ 96%, which is recorded as good; similarity rate < 96%, which is recorded as average; similarity rate < 92%, which is recorded as poor.

[0051] Experiment 3) Printing accuracy The lightweight new energy vehicle component obtained from Application Example 1-12 (specifications: height 5cm, width 20cm, length 20cm, wall thickness 1.0mm, and aperture of the regular hexagonal grid 3mm) was placed in a 25℃ environment for 24 hours. The width, height, length, aperture, and wall thickness were measured using an infrared measuring instrument. Five points were randomly tested, and the average value was taken and recorded as B. The difference was calculated as B minus the corresponding preset value. Taking the wall thickness as an example, the difference was equal to the wall thickness B minus 1.0mm. When the difference (including width, height, length, aperture, and wall thickness) was within -0.02mm to 0.02mm, the printing accuracy was recorded; otherwise, it was considered unqualified.

[0052] The experimental data are detailed in Table 3; Table 3. Experimental data from Examples 1-8, Comparative Examples 1-4, and Application Examples 1-12.

[0053] Comparing Example 1 (Application Example 1) and Comparative Examples 1-4 (Application Examples 9-12), it can be seen that the similarity rate of Comparative Example 1 is poor, and the mechanical properties of Comparative Examples 1 and 2-4 are unqualified. The printing accuracy of Comparative Examples 1-4 is unqualified. Furthermore, the structural stability retention rate of Comparative Examples 1-4 is all below 78%, while that of Example 1 is as high as above 86%. Moreover, the mechanical properties and printing accuracy of Example 1 are qualified. This indicates that by using silazane, double-ended epoxy polyether silicone oil, and amino-containing silane composites in the raw material system of this application, good mechanical properties and printing accuracy can be achieved, but better performance in terms of structural stability can also be obtained (retention rate above 86%, similarity rate above 92%).

[0054] Examples 1, 4, 5, and 6 show that the retention rate of Example 6 is over 90%, while that of Examples 1 and 4-5 is below 90%. Furthermore, the similarity rate of Example 6 is rated as good, Example 1 as average, and Examples 4-5 as good. This indicates that the amino-containing silane composite of this application, composed of vinylbenzylaminotrimethoxysilane hydrochloride, bis(3-trimethoxysilylpropyl)amine, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, and linear hydroxyl-terminated polydimethylsiloxane, exhibits a synergistic effect, further improving the overall performance of the environmentally friendly single-component silicone material after 3D printing.

[0055] 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. An environmentally friendly single-component silicone material, characterized in that, It consists of the following raw materials by weight percentage: Vinyl silicone oil 51-73%; Hydrogen-containing silicone oil 4-10%; Filler 20-30%; Cyclohexanol 0.01-0.1%; Platinum complex 0.1-0.4%; 3-10% silazane composite material; The sum of the weight percentages of the vinyl silicone oil, hydrogen-containing silicone oil, fumed silica, cyclohexanol, platinum complex, and silazane composite material is equal to 100%. The silazane composite material includes silazane, double-ended epoxy polyether silicone oil, and amino-containing silane complex.

2. The environmentally friendly single-component silicone material according to claim 1, characterized in that: The weight ratio of the silazane, the double-ended epoxy polyether silicone oil, and the amino-containing silane complex is 10:(5-8):(2-5).

3. The environmentally friendly single-component silicone material according to claim 1, characterized in that: The silazane is triethylenetrimethylcyclotrisilazane and / or hexaphenylcyclotrisilazane.

4. The environmentally friendly single-component silicone material according to claim 1, characterized in that: The amino-containing silane complex is a combination of one or more of vinylbenzylaminotrimethoxysilane hydrochloride, bis(3-trimethoxysilylpropyl)amine, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, and linear hydroxyl-terminated polydimethylsiloxane, and at least one of them is bis(3-trimethoxysilylpropyl)amine.

5. The environmentally friendly single-component silicone material according to claim 4, characterized in that: The amino-containing silane complex is composed of vinylbenzylaminotrimethoxysilane hydrochloride, bis(3-trimethoxysilylpropyl)amine, N-(β-aminoethyl)-γ-aminopropylmethyl-dimethoxysilane, and linear hydroxyl-terminated polydimethylsiloxane.

6. The environmentally friendly single-component silicone material according to claim 3, characterized in that: The viscosity of the linear hydroxyl-terminated polydimethylsiloxane is 100-1000 mPa·s.

7. The environmentally friendly single-component silicone material according to claim 1, characterized in that: The vinyl silicone oil is one or a combination of more than one of vinyl-terminated silicone oil, side-chain vinyl silicone oil, and vinyl phenyl silicone oil.

8. The environmentally friendly single-component silicone material according to claim 1, characterized in that: The filler is one or more of the following: fumed silica, precipitated silica, alumina, boron nitride, graphene, talc, and carbon nanotubes.

9. A method for preparing an environmentally friendly single-component silicone material according to any one of claims 1-8, characterized in that, Obtained by the following method: Step 1: Dissolve the amino-containing silane complex in a solvent by weight percentage, then mix it evenly with the filler, remove the solvent, and obtain mixture A; mix the silazane and the double-ended epoxy polyether silicone oil evenly to obtain mixture B; Step 2: Weigh out the vinyl silicone oil, platinum complex and all of mixture B by weight percentage, mix them evenly, then add the hydrogen-containing silicone oil and mix evenly. Finally, add all of mixture A and mix evenly to obtain environmentally friendly single-component silicone material.

10. An application of an environmentally friendly single-component silicone material in 3D printing, characterized in that: The environmentally friendly single-component silicone material according to any one of claims 1-8 is used in 3D printing to produce lightweight parts for new energy vehicles.

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