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Polyurethane shock absorber and preparation method thereof

A technology of shock absorber and polyurethane, which is applied in the field of rail transit, can solve the problems of failure to achieve the purpose of use, failure of glue opening, poor shock isolation effect, etc., and achieve the effect of not being easy to fail on the bonding surface, taking into account tight assembly, and taking into account the effect of shock absorption Effect

Active Publication Date: 2021-07-23
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing shock absorbers use a single-formulation single-layer polymer material. Due to the different vibration frequency ranges during vehicle operation (the vibration frequency range during vehicle operation is 10 ~2000Hz) The corresponding material performance parameters are different, the isolation efficiency of different frequency bands in the vibration range is different, and the resonance amplification results in poor overall isolation effect, which cannot achieve the best purpose of use.
[0004]In addition, ball joint products play the role of bearing, transmitting force, and shock absorption and buffering. The existing ball joint products are rubber or polyurethane and Metal composite structure, for example, the outer layer is a metal outer layer, the inner layer is a metal inner sleeve, and polyurethane or rubber is used between the outer layer and the inner sleeve. When the product of this structure is an interference fit when assembled on a vehicle, the above structure needs to be After the product is press-fitted into the sleeve, when the above-mentioned products are subjected to deflection force when the vehicle is running, due to the extremely small relative displacement between the sleeve and the sleeve, the bonding surface between the metal and polyurethane / rubber is subjected to a large shear force, resulting in easy There is a phenomenon of glue failure

Method used

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  • Polyurethane shock absorber and preparation method thereof
  • Polyurethane shock absorber and preparation method thereof
  • Polyurethane shock absorber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] as attached figure 1 The manufacture of the multi-layer polyurethane shock absorber shown, polyurethane materials with different hardness are directly bonded by adhesive, specifically including the following steps and process conditions:

[0066] Step 1: Preparation of polyurethane prepolymer system

[0067] Weigh 100 parts by weight of melted polyethylene adipate with an average molecular weight of 2000, put it into a three-necked flask, heat to (110±5)°C, vacuumize to a pressure of ≤-0.08kPa, and remove moisture (1.5~ 2) h, lower the temperature to (60±5)°C, then add 37 parts of diphenylmethane diisocyanate, control the temperature at (80±2)°C, react for 2h, the measured isocyanate content is 5.9%. Debubble the polyurethane prepolymer under the condition of vacuum pressure ≤ -0.08kPa for (20±5) min to obtain polyurethane prepolymer A for inner layer polyurethane and outer layer polyurethane;

[0068] Weigh 100 parts by weight of melted polyethylene adipate with an a...

Embodiment 2

[0090] as attached figure 2 The manufacture of the multi-layer polyurethane shock absorber shown, polyurethane materials with different hardness are directly bonded by adhesive, specifically including the following steps and process conditions:

[0091] Step 1: Preparation of polyurethane prepolymer system

[0092] Weigh 100 parts by weight of melted polycaprolactone with an average molecular weight of 2000, put it into a reaction kettle, heat to (110±5)°C, evacuate to a pressure of ≤-0.08kPa, and remove moisture for (1.5~2)h, Heat to (127~135)℃, then add 23 parts of 1,5-naphthalene diisocyanate, after it melts, react at (115±5)℃ for (0.3~0.5)h, the measured isocyanate content is 3.98 %. The polyurethane prepolymer is debubbled under the condition of vacuum pressure ≤ -0.08kPa, and the polyurethane prepolymer A for the upper layer polyurethane and the lower layer polyurethane is obtained;

[0093] Weigh 100 parts by weight of melted polyethylene adipate with an average mol...

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Abstract

The invention discloses a polyurethane shock absorber and a preparation method thereof. The polyurethane shock absorber comprises more than two polyurethane elastomer material layers, the hardness degrees of the adjacent polyurethane elastomer material layers are different, and the hardness value set of all the polyurethane elastomer material layers at least comprises two different hardness values. Every two adjacent polyurethane elastomer material layers are formed by being cast in sequence, a binder is brushed or sprayed on the polyurethane elastomer material layer which is formed firstly, and then the other polyurethane elastomer material layer is formed on the surface of the polyurethane elastomer material layer by being cast. By using the multi-layer polyurethane structure with different hardness degrees, the shock absorption effect of different vibration frequency intervals can be achieved, the shock absorption performance is greatly improved, and the glue failure problem of metal and high polymer materials can be effectively avoided.

Description

technical field [0001] The invention belongs to the field of rail transportation, and in particular relates to a polyurethane shock absorber and a preparation method thereof. Background technique [0002] Vehicles will vibrate at different frequencies during operation. In order to improve ride comfort or protect components in the vehicle body, shock absorbers made of polymer materials are required for shock absorption. [0003] Existing shock absorbers use a single-formulation single-layer polymer material. Due to the differences in the corresponding material performance parameters in different vibration frequency ranges during vehicle operation (the vibration frequency range during vehicle operation is 10-2000 Hz), the vibration range Due to the large difference in isolation efficiency in different frequency bands and the resonance amplification, the overall isolation effect is not good, and the best use purpose cannot be achieved. [0004] In addition, ball joint products...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F3/087C08G18/10C08G18/42C08G18/66C08G18/32B32B27/40B32B27/06B32B7/022B32B7/12B29C39/00B29C39/02B29C39/12
CPCF16F3/0876C08G18/10C08G18/6644C08G18/4238C08G18/4277C08G18/6651B32B27/40B32B27/08B32B7/022B32B7/12B29C39/003B29C39/025B29C39/123F16F2224/025F16F2230/40F16F2226/042C08G2350/00B32B2250/24B32B2307/56B29L2031/721C08G18/3206C08G18/3243
Inventor 许双喜张坚强曹彦海颜渊巍朱军冯兴卓
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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