A high stability magnetorheological fluid

Abstract

The invention discloses high-stability magnetorheological fluid, which is prepared from the following ingredients in percentage by weight: 75 to 85 percent of magnetic particles, 15 to 25 percent of carrier liquid, 0.3 to 1 percent of surface active agents, 0.3 to 1 percent of thixotropic agents, 0.3 to 1 percent of antioxidants and 0.3 to 1 percent of antiwear agents. The mineral oil or poly-alpha-alkene synthesis oil is used as the carrier liquid; the sensitivity on various beneficial additives is higher; agglomeration cannot easily occur; copolymers with acid groups are used as the surface active agents; the acid groups can take a reaction with -OH on the surfaces of the magnetic particles; the magnetic particles can be better dispersed into the carrying liquid through the surface active agents; the sedimentary stability of the magnetorheological fluid is improved; the half-month sedimentation rate is only 5 percent; the zero field viscosity of the magnetorheological fluid can also be reduced, and is only 0.38Pa.s; the dissolution capability of the magnetorheological fluid on the magnetic particles is improved; the shearing stress can improved in an occasion with high shearing requirement by improving the volume percentage of the magnetic particles; meanwhile, the good flowability is ensured.

Description

technical field

[0001] The invention relates to a high-stability magnetorheological fluid, which belongs to the technical field of intelligent materials. Background technique

[0002] Magnetorheological fluid is a controllable fluid smart material, which is a solid-liquid two-phase suspension formed by dispersing micron-sized magnetic particles in a carrier liquid. Under the action of an external magnetic field, the rheological properties of the magnetorheological fluid can change drastically within milliseconds, from a fluid with good fluidity to a solid-like substance with a very high viscosity, showing a certain yield stress to the outside, after the magnetic field is removed It changes back to a free-flowing fluid state again, and this change is fast, reversible, and controllable. Because of this characteristic, magnetorheological fluid is widely used in automobiles, machinery, aviation, construction, medical treatment and other fields.

[0003] At present, the researc...

Examples

Embodiment 1

[0028] A high stability magnetorheological fluid, the weight percentage of each component is:

[0029] Magnetic particles 84%,

[0030] Polyalphaolefin Synthetic Oil 13%,

[0031] Acidic group-containing copolymer or copolymer solution 1%,

[0032] Thixotropic agent 0.4%,

[0033] Antioxidant 0.6%,

[0034] Antiwear agent 1%.

[0035] Heat 60g of polyalphaolefin synthetic oil to 55°C, add 2g of thixotropic organic bentonite, and stir evenly; then add 5.1g of acidic group-containing copolymer solution as surfactant, and stir evenly; then add 5g of antiwear agent Graphite, 3g of antioxidant sodium nitrite, stir well; then add 400g of carbonyl iron powder and disperse at high speed for 1 hour to obtain the finished magnetorheological fluid. The viscosity of the magnetorheological fluid at room temperature is 0.808 Pa·s (D=50 / s), the sedimentation rate is lower than 5% after standing at room temperature for half a month, and it is easy to redisperse after sedimentation.

Embodiment 2

[0037] A high stability magnetorheological fluid, the weight percentage of each component is:

[0038] Magnetic particles 75%,

[0039] Mineral Oil 22%,

[0040] Acidic group-containing copolymer or copolymer solution 0.5%,

[0041] Thixotropic agent 0.8%,

[0042] Antioxidant 0.9%,

[0043] Antiwear agent 0.8%.

[0044] Heat 62g of mineral oil to 60°C, add 2.5g of thixotropic fumed silica, and stir well; then add 1.5g of acidic group-containing copolymer solution as surfactant, and stir well; then add 2.5g of anti-wear molybdenum disulfide, 2.5g antioxidant benzoic acid, and stir evenly; then add 210g carbonyl iron powder and disperse at high speed for 1 hour to obtain the finished magnetorheological fluid. The viscosity of the magnetorheological fluid at room temperature is 0.38 Pa·s (D=50 / s), the sedimentation rate is lower than 13% after standing for half a month at room temperature, and it is easy to redisperse after sedimentation.

Embodiment 3

[0046] A high stability magnetorheological fluid, the weight percentage of each component is:

[0047] Magnetic particles 75%,

[0048] Polyalphaolefin Synthetic Oil 22%,

[0049] 0.7% copolymer or copolymer solution containing acidic groups,

[0050] Thixotropic agent 1%,

[0051] Antioxidant 0.7%,

[0052] Antiwear agent 0.6%.

[0053] Heat 62g of polyalphaolefin synthetic oil to 65°C, add 3g of thixotropic agent fumed silica, and stir evenly; then add 2.04g of acidic group-containing copolymer solution as surfactant, and stir evenly; then add 2g of anti- Abrasive graphite, 2g antioxidant sodium nitrite, stir evenly; then add 210g carbonyl iron powder and disperse at high speed for 1 hour to obtain the finished magnetorheological fluid. The viscosity of the magnetorheological fluid at room temperature is 0.63 Pa·s (D=86 / s), the sedimentation rate is lower than 5.7% after standing for half a month at room temperature, and it is easy to redisperse after sedimentation.

technical field

[0001] The invention relates to a high-stability magnetorheological fluid, which belongs to the technical field of intelligent materials. Background technique

[0002] Magnetorheological fluid is a controllable fluid smart material, which is a solid-liquid two-phase suspension formed by dispersing micron-sized magnetic particles in a carrier liquid. Under the action of an external magnetic field, the rheological properties of the magnetorheological fluid can change drastically within milliseconds, from a fluid with good fluidity to a solid-like substance with a very high viscosity, showing a certain yield stress to the outside, after the magnetic field is removed It changes back to a free-flowing fluid state again, and this change is fast, reversible, and controllable. Because of this characteristic, magnetorheological fluid is widely used in automobiles, machinery, aviation, construction, medical treatment and other fields.

[0003] At present, the researc...

Examples

Embodiment 1

[0028] A high stability magnetorheological fluid, the weight percentage of each component is:

[0029] Magnetic particles 84%,

[0030] Polyalphaolefin Synthetic Oil 13%,

[0031] Acidic group-containing copolymer or copolymer solution 1%,

[0032] Thixotropic agent 0.4%,

[0033] Antioxidant 0.6%,

[0034] Antiwear agent 1%.

[0035] Heat 60g of polyalphaolefin synthetic oil to 55°C, add 2g of thixotropic organic bentonite, and stir evenly; then add 5.1g of acidic group-containing copolymer solution as surfactant, and stir evenly; then add 5g of antiwear agent Graphite, 3g of antioxidant sodium nitrite, stir well; then add 400g of carbonyl iron powder and disperse at high speed for 1 hour to obtain the finished magnetorheological fluid. The viscosity of the magnetorheological fluid at room temperature is 0.808 Pa·s (D=50 / s), the sedimentation rate is lower than 5% after standing at room temperature for half a month, and it is easy to redisperse after sedimentation.

Embodiment 2

[0037] A high stability magnetorheological fluid, the weight percentage of each component is:

[0038] Magnetic particles 75%,

[0039] Mineral Oil 22%,

[0040] Acidic group-containing copolymer or copolymer solution 0.5%,

[0041] Thixotropic agent 0.8%,

[0042] Antioxidant 0.9%,

[0043] Antiwear agent 0.8%.

[0044] Heat 62g of mineral oil to 60°C, add 2.5g of thixotropic fumed silica, and stir well; then add 1.5g of acidic group-containing copolymer solution as surfactant, and stir well; then add 2.5g of anti-wear molybdenum disulfide, 2.5g antioxidant benzoic acid, and stir evenly; then add 210g carbonyl iron powder and disperse at high speed for 1 hour to obtain the finished magnetorheological fluid. The viscosity of the magnetorheological fluid at room temperature is 0.38 Pa·s (D=50 / s), the sedimentation rate is lower than 13% after standing for half a month at room temperature, and it is easy to redisperse after sedimentation.

Embodiment 3

[0046] A high stability magnetorheological fluid, the weight percentage of each component is:

[0047] Magnetic particles 75%,

[0048] Polyalphaolefin Synthetic Oil 22%,

[0049] 0.7% copolymer or copolymer solution containing acidic groups,

[0050] Thixotropic agent 1%,

[0051] Antioxidant 0.7%,

[0052] Antiwear agent 0.6%.

[0053] Heat 62g of polyalphaolefin synthetic oil to 65°C, add 3g of thixotropic agent fumed silica, and stir evenly; then add 2.04g of acidic group-containing copolymer solution as surfactant, and stir evenly; then add 2g of anti- Abrasive graphite, 2g antioxidant sodium nitrite, stir evenly; then add 210g carbonyl iron powder and disperse at high speed for 1 hour to obtain the finished magnetorheological fluid. The viscosity of the magnetorheological fluid at room temperature is 0.63 Pa·s (D=86 / s), the sedimentation rate is lower than 5.7% after standing for half a month at room temperature, and it is easy to redisperse after sedimentation.