Silicone rubber for ai intelligent simulation robot and preparation method thereof

Abstract

The application relates to the technical field of robot preparation, in particular to AI intelligent simulation robot silicone rubber and a preparation method thereof. The silicone rubber is prepared from the following components: modified polysiloxane 35-62 parts, filler 15-35 parts, solvent 100-300 parts, crosslinking agent 21-35 parts, additive 12-25 parts, dispersion aid 1-3 parts, polyvinylpyrrolidone 8-12 parts, antibacterial agent 6-18 parts, polydopamine 2-5 parts and hydrogen-containing silicone oil 2-9 parts. The prepared silicone rubber has lower hardness, softer and smoother touch, is closer to human skin, and has excellent flexibility, ductility and high and low temperature resistance.

Description

Technical Field

[0001] This invention relates to the field of robot manufacturing technology, and more specifically, to silicone rubber for AI intelligent simulation robots and its preparation method. Background Technology

[0002] New materials for robots refer to materials used in the manufacturing and application of robots, aiming to improve robot performance, reliability, and lifespan. Flexible materials are increasingly used in robot shells, joints, and sensors. Flexible materials possess excellent elasticity and deformation capabilities, enabling robots to adapt to various environments and task requirements.

[0003] Silicone rubber possesses excellent flexibility and elasticity, enabling it to withstand complex movements and deformations while maintaining structural integrity. This property makes it an important material for soft and biomimetic robots, such as for flexible joints, biomimetic skin, and soft actuators. Silicone rubber is non-toxic, odorless, and has good biocompatibility, making it suitable for applications in medical robots, humanoid robots, and other scenarios involving direct contact with the human body.

[0004] In existing technologies, silicone rubber materials are highly elastic but have a relatively hard feel and do not support dyeing. Silicone rubber suffers from insufficient mechanical properties in simulated skin applications; as the thickness of silicone rubber increases, its subcutaneous mechanical structure linkage performance deteriorates. Silicone rubber is prone to aging and cracking under acidic and hot environments, and interface defects accelerate its performance decline. This aging behavior significantly affects the mechanical properties and service life of silicone rubber. Summary of the Invention

[0005] This invention provides silicone rubber for AI intelligent simulation robots and its preparation method. The silicone rubber obtained has lower hardness, a softer and smoother feel, and is closer to human skin. It also has excellent flexibility, ductility, and resistance to high and low temperatures.

[0006] In a first aspect, the present invention provides silicone rubber for AI intelligent simulation robots, which is made of the following components: 35-62 parts of modified polysiloxane, 15-35 parts of filler, 100-300 parts of solvent, 21-35 parts of crosslinking agent, 12-25 parts of additive, 1-3 parts of dispersant, 8-12 parts of polyvinylpyrrolidone, 6-18 parts of antibacterial agent, 2-5 parts of polydopamine, and 2-9 parts of hydrogen-containing silicone oil.

[0007] Preferably, the modified polysiloxane is a hyperbranched polysiloxane, which is synthesized from γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol via transesterification polycondensation. The mass ratio of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol is 1-1.5:2-3:1-5.

[0008] Preferably, the filler is modified attapulgite, which is obtained by intercalation modification of bis(octadecyl)dimethylammonium chloride, and the mass ratio of bis(octadecyl)dimethylammonium chloride to attapulgite is 1-2:3-11.

[0009] Preferably, the crosslinking agent is one or more selected from benzoyl peroxide, aminated silica particles, dicyclohexyl peroxide, and vinyltributylone oxime silane.

[0010] Preferably, the additives include a softener and a surfactant, wherein the softener is one of polyether-modified silicone oil, hydroxyl silicone oil, and dodecyl polysiloxane.

[0011] Preferably, the surfactant is one or both of chitosan and alkyltrimethylammonium chloride.

[0012] Preferably, the dispersing agent is one or more of carboxymethyl cellulose, high molecular weight silicone oil dispersant, polydimethylsiloxane, and organosilicon dispersant.

[0013] Preferably, the antibacterial agent is one or more of inorganic silver antibacterial agents, inorganic silver-zinc antibacterial agents, organic antibacterial agents, and nano-silver liquid antibacterial agents.

[0014] Secondly, the present invention provides a method for preparing silicone rubber for AI intelligent simulation robots, comprising the following steps:

[0015] (1) Mix the modified polysiloxane, filler, solvent, crosslinking agent, polyvinylpyrrolidone and hydrogen-containing silicone oil, stir evenly to obtain the matrix;

[0016] (2) Add the additives, dispersants, antibacterial agents and polydopamine to the matrix, mix them, and degas under vacuum conditions for 5-10 minutes.

[0017] (3) Pour the degassed silicone rubber evenly into the mold, heat and cure it. After curing, you will get silicone rubber for AI intelligent simulation robots.

[0018] Preferably, in step (3), the curing conditions are: curing at 75-100℃ for 5-15 minutes.

[0019] In summary, the present invention has the following beneficial effects:

[0020] 1. The modified polysiloxane in this invention is a hyperbranched polysiloxane. γ-(2,3-epoxypropoxy)propyltrimethoxysilane undergoes hydrolysis in water to generate Si-OH bonds, which subsequently condense with another molecule to form a polysiloxane. The epoxy groups can undergo addition reactions with unsaturated groups in the resin, enhancing the crosslinking density and stability of the material. Its chemical properties give it good activity in hydrolysis and condensation reactions, and it significantly improves material performance through coupling in polymerization reactions. In transesterification reactions, diethylene glycol can react with fatty acids or aromatic carboxylic acids through its two hydroxyl groups to generate diesters or polyesters. The function of diethylene glycol in transesterification reactions is mainly reflected in its polyhydroxy structure, which enables it to react efficiently with various carboxylic acids to generate ester compounds with specific properties. These compounds have wide applications in industrial settings.

[0021] 2. In this invention, the two phenolic hydroxyl groups of 4,4′-isopropyldiphenol can simultaneously react with the epoxy groups of γ-(2,3-epoxypropoxy)propyltrimethoxysilane to form stable ether bonds, thereby achieving chemical bonding. This reaction can effectively improve the compatibility of γ-(2,3-epoxypropoxy)propyltrimethoxysilane with phenolic materials, while enhancing the mechanical properties and heat resistance of the materials. Similarly, the two hydroxyl groups of diethylene glycol can react with the epoxy groups of γ-(2,3-epoxypropoxy)propyltrimethoxysilane to form ether bonds, and simultaneously form polyether chains through the hydroxyl condensation reaction of the diol, thereby increasing the crosslinking density and mechanical properties of the material. This reaction mechanism is helpful in preparing composite materials with high elasticity and high strength. The hyperbranched polysiloxane synthesized by transesterification polycondensation combines the coupling properties of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, the rigidity of bisphenol A, and the flexibility of diethylene glycol, exhibiting high thermal stability and excellent mechanical properties.

[0022] 3. This invention incorporates hyperbranched polysiloxanes. The main chain of hyperbranched polysiloxanes consists of Si-O-Si bonds with relatively long bond lengths and bond angles, giving them high flexibility and molecular fluidity. Their molecular structure contains numerous siloxane groups, which can be modified and functionalized through various chemical reactions. The molecular structure also contains numerous branches and end groups, which impart excellent solubility and surface activity to the material, while simultaneously enhancing intermolecular interactions. The hyperbranched structure gives the molecular chain high flexibility and ductility, while the branched structure effectively disperses stress, improving the material's impact resistance and toughness. Hyperbranched polysiloxanes exhibit high chemical stability, primarily due to the chemical inertness of their Si-O bonds, allowing them to remain stable under various harsh environments. The silanol groups of the hyperbranched polysiloxane form hydrogen bonds or covalent bonds with the silica filler in the silicone rubber, reducing filler agglomeration. The entanglement of the branched molecular chains absorbs impact energy, improving the elongation at break and tear resistance of the silicone rubber.

[0023] 4. In this invention, modified attapulgite is added. The modified attapulgite is prepared by intercalation modification with dioctadecyl dimethyl ammonium chloride. The intercalation modification with dioctadecyl dimethyl ammonium chloride significantly improves the interfacial bonding ability between attapulgite and the silicone rubber matrix. Attapulgite itself has a layered chain structure and nanofiber morphology. After modification, its interlayer spacing is expanded through the ion exchange of quaternary ammonium salt cations, and its surface hydrophobicity is enhanced, thus making it easier to bond with the hydrophobic silicone rubber molecular chains. Long hydrophobic chains (dioctadecyl) cover the surface of attapulgite through physical adsorption or chemical bonding, reducing its surface polarity and interfacial tension with the silicone rubber matrix. This hydrophobic treatment effectively inhibits the aggregation of attapulgite, enabling it to form a more uniform nanoscale dispersion in the silicone rubber. In addition, the micelle-forming ability of dioctadecyl dimethyl ammonium chloride further promotes the compatibility between the filler and the matrix, avoiding the decline in mechanical properties caused by filler aggregation.

[0024] 5. The interfacial interaction mechanism of the hyperbranched polysiloxane and modified attapulgite composite system of this invention mainly involves the formation of hydrogen bonds and covalent bonds. Specifically, the silane groups in the hyperbranched polysiloxane react with the hydroxyl groups on the surface of attapulgite to form hydrogen bonds. Simultaneously, through dehydration during the heating and curing process, they further form covalent bonds with the attapulgite surface, thereby enhancing the interfacial bonding force. The silane coupling agent reacts with the hydroxyl groups on the attapulgite surface to form siloxane bonds (Si-O-Si), thereby enhancing the bonding force between attapulgite and the matrix material. The synergistic reinforcing effect of hyperbranched polysiloxane and modified attapulgite is evident. Modified attapulgite, as a rigid nanofiller, provides mechanical reinforcement, while hyperbranched polysiloxane, as a flexible crosslinking agent, enhances toughness. Through interfacial synergy, they form a "rigid-flexible" composite system, playing a key role in improving the aging resistance and solvent resistance of silicone rubber.

[0025] 6. The silicone rubber for AI intelligent simulation robots prepared by this invention has lower hardness, a softer and smoother feel, and is closer to human skin. It also has excellent flexibility, ductility, and resistance to high and low temperatures.

[0026] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the scope of protection of the present invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the embodiments. It should be noted that: unless otherwise specified, the conditions in the following embodiments are carried out according to conventional conditions or the conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following embodiments can be obtained from commercially available sources.

[0028] Example

[0029] Example 1

[0030] The silicone rubber for AI intelligent simulation robots is made of the following components: 35 parts modified polysiloxane, 15 parts filler, 100 parts solvent, 21 parts crosslinking agent, 12 parts additive, 1 part dispersant, 8 parts polyvinylpyrrolidone, 6 parts antibacterial agent, 2 parts polydopamine, and 2 parts hydrogen-containing silicone oil.

[0031] The modified polysiloxane is a hyperbranched polysiloxane, which is synthesized from γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol via transesterification polycondensation. The mass ratio of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol is 1:2:1.

[0032] The filler is modified attapulgite, which is prepared by intercalation modification of dioctadecyl dimethyl ammonium chloride. The mass ratio of dioctadecyl dimethyl ammonium chloride to attapulgite is 1:3.

[0033] The crosslinking agent is benzoyl peroxide; the softener is polyether-modified silicone oil; the surfactant is alkyltrimethylammonium chloride; the dispersing aid is carboxymethyl cellulose; and the antibacterial agent is nano-silver liquid antibacterial agent.

[0034] The preparation method of silicone rubber for AI intelligent simulation robots includes the following steps:

[0035] (1) Mix the modified polysiloxane, filler, solvent, crosslinking agent, polyvinylpyrrolidone and hydrogen-containing silicone oil, stir evenly to obtain the matrix;

[0036] (2) Add the additives, dispersants, antibacterial agents and polydopamine to the matrix, mix them, and degas under vacuum for 5 minutes.

[0037] (3) Pour the degassed silicone rubber evenly into the mold, heat and cure it to obtain silicone rubber for AI intelligent simulation robots. The heat curing conditions are: cure at 75℃ for 15 min.

[0038] Example 2

[0039] The silicone rubber for AI intelligent simulation robots is made of the following components: 58 parts modified polysiloxane, 29 parts filler, 200 parts solvent, 28 parts crosslinking agent, 21 parts additive, 2 parts dispersant, 10 parts polyvinylpyrrolidone, 12 parts antibacterial agent, 3 parts polydopamine, and 6 parts hydrogen-containing silicone oil.

[0040] The modified polysiloxane is a hyperbranched polysiloxane, which is synthesized from γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol via transesterification polycondensation. The mass ratio of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol is 1:3:2.

[0041] The filler is modified attapulgite, which is prepared by intercalation modification of dioctadecyl dimethyl ammonium chloride. The mass ratio of dioctadecyl dimethyl ammonium chloride to attapulgite is 1:5.

[0042] The crosslinking agent is benzoyl peroxide; the softener is polyether-modified silicone oil; the surfactant is alkyltrimethylammonium chloride; the dispersing aid is carboxymethyl cellulose; and the antibacterial agent is nano-silver liquid antibacterial agent.

[0043] The preparation method of silicone rubber for AI intelligent simulation robots includes the following steps:

[0044] (1) Mix the modified polysiloxane, filler, solvent, crosslinking agent, polyvinylpyrrolidone and hydrogen-containing silicone oil, stir evenly to obtain the matrix;

[0045] (2) Add the additives, dispersants, antibacterial agents and polydopamine to the matrix, mix them, and degas under vacuum for 10 minutes.

[0046] (3) Pour the degassed silicone rubber evenly into the mold, heat and cure it to obtain silicone rubber for AI intelligent simulation robots. The heat curing conditions are: cure at 100℃ for 5 minutes.

[0047] Example 3

[0048] The silicone rubber for AI intelligent simulation robots is made of the following components: 62 parts modified polysiloxane, 35 parts filler, 300 parts solvent, 35 parts crosslinking agent, 25 parts additive, 3 parts dispersing agent, 12 parts polyvinylpyrrolidone, 18 parts antibacterial agent, 5 parts polydopamine, and 9 parts hydrogen-containing silicone oil.

[0049] The modified polysiloxane is a hyperbranched polysiloxane, which is synthesized from γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol via transesterification polycondensation. The mass ratio of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol is 1:2:5.

[0050] The filler is modified attapulgite, which is prepared by intercalation modification of dioctadecyl dimethyl ammonium chloride. The mass ratio of dioctadecyl dimethyl ammonium chloride to attapulgite is 1:11.

[0051] The crosslinking agent is benzoyl peroxide; the softener is polyether-modified silicone oil; the surfactant is alkyltrimethylammonium chloride; the dispersing aid is carboxymethyl cellulose; and the antibacterial agent is nano-silver liquid antibacterial agent.

[0052] The preparation method of silicone rubber for AI intelligent simulation robots includes the following steps:

[0053] (1) Mix the modified polysiloxane, filler, solvent, crosslinking agent, polyvinylpyrrolidone and hydrogen-containing silicone oil, stir evenly to obtain the matrix;

[0054] (2) Add the additives, dispersants, antibacterial agents and polydopamine to the matrix, mix them, and degas under vacuum for 10 minutes.

[0055] (3) Pour the degassed silicone rubber evenly into the mold, heat and cure it to obtain silicone rubber for AI intelligent simulation robots. The heat curing conditions are: cure at 100℃ for 10 min.

[0056] Comparative Example 1

[0057] Prepared using the same method as in Example 1, except that no modified polysiloxane was added.

[0058] Comparative Example 2

[0059] Prepared using the same method as in Example 1, except that the modified polysiloxane was replaced with dihydroxy polysiloxane.

[0060] Comparative Example 3

[0061] Prepared using the same method as in Example 1, except that no modified attapulgite was added.

[0062] Performance testing:

[0063] The resilience and tensile strength of the silicone rubbers in Examples 1-3 and Comparative Examples 1-3 of this invention were tested, and the test results are shown in Table 1.

[0064] Table 1

[0065]

[0066]

[0067] As shown in Table 1, the silicone rubber prepared in Example 1 has good resilience and mechanical properties, indicating that the silicone rubber for AI intelligent simulation robots has lower hardness, a softer and smoother feel, is closer to human skin, and has excellent flexibility.

[0068] The above description is merely an exemplary embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. Silicone rubber for AI intelligent simulation robots, characterized in that, It is made of the following components: 35-62 parts modified polysiloxane, 15-35 parts filler, 100-300 parts solvent, 21-35 parts crosslinking agent, 12-25 parts additive, 1-3 parts dispersing agent, 8-12 parts polyvinylpyrrolidone, 6-18 parts antibacterial agent, 2-5 parts polydopamine, and 2-9 parts hydrogen-containing silicone oil; The modified polysiloxane is a hyperbranched polysiloxane, which is synthesized from γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol via transesterification polycondensation. The mass ratio of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 4,4′-isopropyldiphenol and diethylene glycol is 1-1.5:2-3:1-5. The filler is modified attapulgite, which is obtained by intercalation modification of bis(octadecyl)dimethylammonium chloride, and the mass ratio of bis(octadecyl)dimethylammonium chloride to attapulgite is 1-2:3-11.

2. The silicone rubber for AI intelligent simulation robots according to claim 1, characterized in that, The crosslinking agent is one or more of benzoyl peroxide and dicyclohexyl peroxide.

3. The silicone rubber for AI intelligent simulation robots according to claim 1, characterized in that, The additives include a softener and a surfactant, wherein the softener is one of polyether-modified silicone oil, hydroxyl silicone oil, and dodecyl polysiloxane.

4. The silicone rubber for AI intelligent simulation robots according to claim 3, characterized in that, The surfactant is one or both of chitosan and alkyltrimethylammonium chloride.

5. The silicone rubber for AI intelligent simulation robots according to claim 1, characterized in that, The dispersing agent is one or more of carboxymethyl cellulose and high molecular weight silicone oil dispersants.

6. The silicone rubber for AI intelligent simulation robots according to claim 1, characterized in that, The antibacterial agent is one or more of inorganic silver antibacterial agents, inorganic silver-zinc antibacterial agents, and organic antibacterial agents.

7. The method for preparing silicone rubber for AI intelligent simulation robots according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Mix the modified polysiloxane, filler, solvent, crosslinking agent, polyvinylpyrrolidone and hydrogen-containing silicone oil, stir evenly to obtain the matrix; (2) Add the additives, dispersants, antibacterial agents and polydopamine to the matrix, mix, and degas under vacuum conditions for 5-10 minutes. (3) Pour the degassed silicone rubber evenly into the mold, heat and cure it. After curing, you will get silicone rubber for AI intelligent simulation robots.

8. The method for preparing silicone rubber for AI intelligent simulation robots according to claim 7, characterized in that, In step (3), the conditions for heat curing are: curing at 75-100℃ for 5-15 minutes.

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