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Polybutylene terephthalate-based bridge support friction material and preparation method thereof

A polybutylene terephthalate and friction material technology, which is applied in the field of bridge bearing friction materials and manufacturing bridge bearing friction slide plates, can solve the problem of unsatisfactory properties such as hardness, strength, deformation resistance, heat resistance, etc. problem, to achieve the effect of high surface hardness, high mechanical strength, low line wear rate

Active Publication Date: 2022-03-22
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to aim at the hardness, strength, deformation resistance and heat resistance of polytetrafluoroethylene-based and ultra-high molecular weight polyethylene-based friction materials in the prior art To solve the problem of unsatisfactory performance, provide a polybutylene terephthalate-based friction material for bridge bearings with high hardness, high strength, strong deformation resistance, and excellent heat resistance

Method used

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  • Polybutylene terephthalate-based bridge support friction material and preparation method thereof
  • Polybutylene terephthalate-based bridge support friction material and preparation method thereof

Examples

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Embodiment 1

[0020] In parts by volume, polybutylene terephthalate resin (with a density of 1.20 g / cm 3 ; Melt volume flow rate is 40 cm 3 / 10 min) 90 parts, dried in a constant temperature oven at 120 ℃ for 2 hours, combined with 6.6 parts of glass fiber (12 μm in diameter, 120 μm in length), 3 parts of polytetrafluoroethylene powder (average particle size of 80 μm ), 0.3 parts of plasticizer ethylene-acrylate-glycidyl methacrylate (mass fraction of glycidyl methacrylate is 10%), 0.1 part of BASF Irganox 1010 (antioxidant), preliminarily After mixing, it is injected into a twin-screw extruder; the mixture is melted and blended uniformly through a twin-screw extruder (extrusion temperature is 265°C, and the screw speed is 50 rpm). After cooling in a water tank, granulate (the diameter of the pellets is 2-4 mm, and the length is 3-5 mm) and dry, and then the pellets are injected into the injection molding machine (the temperature of the hopper is 260 ° C, the temperature of the mold is 70 ...

Embodiment 2

[0022] In parts by volume, polybutylene terephthalate resin (density of 1.25 g / cm 3 ; Melt volume flow rate is 20 cm 3 / 10 min) 86 parts, dried in a constant temperature oven at 120 °C for 2 h, combined with 10 parts of carbon fiber (7 μm in diameter, 140 μm in length), 1 part of ultra-high molecular weight polyethylene (average particle size of 80 μm), plasticized ethylene-acrylate-glycidyl methacrylate (mass fraction of glycidyl methacrylate is 10%) 2.9 parts, antioxidant (BASF Irganox 1010) 0.1 part, mixed by automatic feeder and injected into double A screw extruder was used for melt blending (extrusion temperature 255 °C, screw speed 100 rpm). After cooling in the water tank, granulate (the diameter of the pellets is 2-4 mm, and the length is 3-5 mm) and dry; then the pellets are injected into the injection molding machine (the temperature of the hopper is 265 ° C, the mold temperature is 70 ° C; the injection pressure 80 MPa.), holding pressure molding (holding pressur...

Embodiment 3

[0024] In parts by volume, take polybutylene terephthalate resin (the density of polybutylene terephthalate resin is 1.20 g / cm 3 ; Melt volume flow rate is 40 cm 3 / 10 min. ) 92 parts, dried in a constant temperature oven at 120°C for 2 hours, mixed with 6.6 parts of carbon fiber (diameter of carbon fiber is 7 μm, length of 140 μm), 3 parts of polyvinylidene fluoride (average particle size of 80 μm), plasticizer ethylene - 0.2 part of acrylate-glycidyl methacrylate (the mass fraction of glycidyl methacrylate is 8%), 0.1 part of antioxidant (BASF Irganox 1010), and inject into twin-screw extruder after initial mixing by automatic feeder The feed inlet of the machine; the mixed material is melted and blended by a twin-screw extruder (extrusion temperature 260°C, screw speed 70 rpm). After cooling in a water tank, pelletize (diameter of pellets is 2-4 mm, length 3-5 mm) and dry, and then inject pellets through injection molding machine (hopper temperature is 265°C, mold tempera...

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Abstract

The invention discloses a polybutylene terephthalate-based bridge support friction material and a preparation method thereof. The polybutylene terephthalate-based bridge support friction material is prepared by melt extrusion, granulation and injection molding of polybutylene terephthalate resin, reinforced fibers, a lubricating phase and other auxiliaries. According to the invention, the polybutylene terephthalate is used as a matrix, and the organic / inorganic multi-phase filler and the multi-scale modified butylene terephthalate resin are used, so that the prepared polybutylene terephthalate-based composite material has excellent mechanical strength, and has lower wear rate and stable friction coefficient when being applied to a bridge support friction material; the composite material is particularly suitable for heavy-load and high-speed working conditions of high-speed rail bridge supports and can also be applied to manufacturing of various friction parts under the dry friction working condition.

Description

technical field [0001] The invention relates to a friction material for a bridge support, in particular to a polybutylene terephthalate resin-based friction material for a bridge support and a preparation method thereof. Construction and lubricating materials field. Background technique [0002] Polymer friction slide plates are widely used in railway and highway bridge bearings. They are the core functional components to ensure that the bridge structure can bear the horizontal displacement caused by vehicle load, temperature creep and concrete expansion and contraction, and the angular displacement caused by earthquake deflection. With the continuous improvement of the domestic requirements for the bearing capacity and seismic capacity of bridges, the functional requirements for polymer friction sliding plate materials have also increased accordingly: the friction materials for bridge bearings should maintain low friction coefficients under extremely high instantaneous load...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L27/18C08L23/08C08L23/06C08L27/16C08K7/14C08K5/134C08K7/06
CPCC08L67/02C08K2201/003C08K2201/004C08L2201/08C08L2207/068C08L27/18C08L23/0884C08K7/14C08K5/1345C08L23/06C08K7/06C08L27/16
Inventor 刘昊王建章阎逢元
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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