A kind of modified silica fume wool and its preparation method and application

A technology of modifying silicon and silica fume cotton, which is applied in the direction of chemical instruments and methods, mechanical equipment, brake types, etc., can solve the problems of limited friction coefficient and failure to meet the new standard requirements of disc brake pads, and achieve improved friction resistance Effect

Active Publication Date: 2022-07-08
大冶市启发矿产品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica fume cotton is the main component commonly used in resin-based friction materials, and its modification can improve the performance of the material. However, the current modification is limited to improve the friction factor and does not meet the current new standard requirements for disc brake pads.

Method used

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  • A kind of modified silica fume wool and its preparation method and application
  • A kind of modified silica fume wool and its preparation method and application
  • A kind of modified silica fume wool and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]

[0025] Preparation of the compound of formula I: To a solution of 1.00 g (8.10 mmol) of 5,5-dimethyl-cyclohex-2-enone in 10 ml of dry toluene was added 0.02 g of tert-butyl at room temperature under nitrogen potassium alkoxide, followed by the addition of 1.93 g (8.10 mmol) of 3-mercaptopropyltriethoxysilane. The reaction was stirred at room temperature for 18 hours. Ethyl acetate was added and the organic phase was washed twice with brine. The organic layer was dried over sodium sulfate, filtered and concentrated using a vacuum rotary evaporator to give 3.70 g of a colorless liquid. 1H NMR (400MHz, CDCl 3 ): δ=3.83 (q, J=6.8Hz, OCH 2 CH 3 , 6H); 3.10-3.00 (m, SCH, 1H); 2.70-2.55 (m, 3H); 2.30-2.05 (m, 3H); 1.95-1.85 (m, 1H); 1.75-1.55 (m, 3H) ; 1.24(t, J=6.8Hz, OCH 2 CH 3 , 9H); 1.10 (s, CH 3 , 3H); 0.91 (s, CH 3 , 3H); 0.80-0.65 (m, SCH 2 CH 2 CH 2 Si, 2H). 13C NMR (100MHz, CDCl 3 ): δ=209.13(s); 58.41(t); 54.13(t); 48.10(t); 45.62(t); 38.95(d); 35....

Embodiment 2

[0027] A preparation method of modified silica fume wool is carried out according to the following steps:

[0028] (1) Dissolve 3-isocyanatopropyltrimethoxysilane in water to prepare an aqueous solution with a mass concentration of 20%;

[0029] (2) the compound described in formula I is dissolved in dehydrated alcohol, and is mixed with the ethanolic solution that mass concentration is 20%;

[0030] (3) Mix the solutions prepared in steps (1) and (2) according to the volume ratio of 1:1, add silica fume wool, and the amount-to-mass ratio of the silica fume wool and the silane coupling agent solution is 1:2, and the water bath Heating and stirring for 12 min, then filtering, air-drying naturally, placing in an oven, and drying at 80° C. for 1.5 h to obtain the silica fume wool modified by the coupling agent.

Embodiment 3

[0032] A preparation method of modified silica fume wool is carried out according to the following steps:

[0033] (1) Dissolve 3-isocyanatopropyltrimethoxysilane in water to prepare an aqueous solution with a mass concentration of 20%;

[0034] (2) Add silica fume wool to the silane coupling agent solution prepared in step (1), the dosage and mass ratio of the silica fume wool and the silane coupling agent solution is 1:2, heat in a water bath and stir for 12 minutes, then filter and air dry naturally , put it in an oven, and dry it at 80 °C for 1.5 h to obtain a silica fume wool modified with a coupling agent.

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Abstract

The invention discloses a modified silica fume wool and a preparation method and application thereof. The modified silica fume wool is prepared by joint modification of 3-isocyanatopropyltrimethoxysilane and a silane coupling agent as described in formula I. The modified silica fume wool prepared by the invention is modified jointly by two silane coupling agents, which greatly improves the friction resistance of the material. The friction coefficient of the disc brake pad prepared by using the modified silica fume wool as a raw material reaches 0.63, which meets the requirement of Current requirements for the preparation of disc brake pads.

Description

technical field [0001] The invention belongs to the technical field of friction material preparation, and particularly relates to a modified silica fume wool and a preparation method and application thereof. Background technique [0002] With the rapid development of modern means of transportation, automobiles are used more and more widely, and the safety performance of automobiles in operation mainly depends on the braking system. The friction material plays a key role in the braking behavior of the vehicle. During a braking process, the kinetic energy of the running vehicle is converted into thermal energy on the surface of the friction pair. These thermal energy are mainly generated by the conduction of the brake disc and the convection to the atmosphere. consume. Some chemical reactions, metallographic changes and wear processes are induced on the friction material. Usually, the temperature of the front brake disc of a car is 150-250 ℃, and the surface temperature of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F7/18C09K3/14F16D65/092F16D69/02
CPCC07F7/1872C09K3/149F16D65/092F16D69/02F16D69/023F16D2200/0034F16D2200/0082F16D2250/0023Y02W30/91
Inventor 赵利槐赵芯萌赵文轩
Owner 大冶市启发矿产品有限公司
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