Method for preparing molecular sieves dryer special used for pneumatic braking system

A technology of pneumatic brakes and molecular sieves, applied in clay preparation devices, chemical instruments and methods, clay processing equipment, etc., can solve problems such as damage to metal components, poor dry and wet strength, and poor vibration and wear resistance, and achieve enhanced strength, No fragmentation, the effect of reducing waste of raw materials

Active Publication Date: 2007-10-17
SHANGHAI RES INST OF CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent uses attapulgite as the main raw material, the dynamic drying capacity is lower than that of molecular sieve desiccant, the dry and wet strength

Method used

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  • Method for preparing molecular sieves dryer special used for pneumatic braking system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of a special molecular sieve desiccant for a pneumatic brake system, uniformly mixing powdery 3A molecular sieve raw powder and clay to obtain a powder mixture (molecular sieve raw powder accounts for 80wt%, clay accounts for 20wt%), and adds a liquid silicate binder Bonded to make 0.5 ~ 5.0mm particles (the ratio of powder mixture and silicate binder is 80wt%: 20wt%), the particles are put into the muffle furnace and baked at 700 ° C, after complete cooling, vacuum Packaging, that is, get special molecular sieve desiccant for pneumatic brake system.

[0031] The obtained product has the following properties: high dynamic adsorption capacity, dynamic water adsorption capacity of 22.0wt% under 25°C and 50% RH conditions, bulk specific gravity: 0.85g / cm 3 , The compressive strength is 55N in dry state, and the compressive strength is 38N after being completely immersed in water for 5 seconds.

Embodiment 2

[0033] A preparation method of a special molecular sieve desiccant for a pneumatic brake system, except that the added 4A powdered molecular sieve raw powder, spherical particles with a diameter of 1.6-2.4mm are put into a muffle furnace and roasted at 200°C, other operations are carried out in the same way Example 1, the properties of the obtained product are as follows: dynamic water adsorption capacity of 25.2wt% under 25°C and 50% RH conditions, bulk specific gravity: 0.82g / cm 3 , The compressive strength in dry state is 67N, and the compressive strength is ≥42N after being completely immersed in water for 5 seconds.

Embodiment 3

[0035]A preparation method of a special molecular sieve desiccant for a pneumatic brake system, uniformly mixing 3A powdered molecular sieve and clay to obtain a powdery mixture (the original powder of molecular sieve accounts for 60wt%, and clay accounts for 40wt%), adding a liquid silicate binder for bonding Make 3~5mm particle (the ratio of powdery mixture and silicate binder is 60wt%: 40wt%), this particle is put into muffle furnace and is dried under 300 ℃ condition; Other operation is the same as embodiment 1. The properties of the obtained product are as follows: dynamic water adsorption capacity of 19.8wt% at 25°C and 50% RH, bulk specific gravity: 0.83g / cm 3 , The compressive strength in dry state is 86N, and the compressive strength is ≥44N after being completely immersed in water for 5 seconds.

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Abstract

The present invention relates to a manufacturing method for molecular sieve desiccant special for pneumatic brake system, which comprises the steps of that: the molecular sieve initial powder and clay are mixed to a scale, and then are bonded by liquid silicate binder to form granule which is dried or baked at 200~700 DEG C to produce the desiccant product. Compared with the prior art, the present invention has the advantages of short procedure, simple operation, energy saving, non discharging of the three wastes; besides, the product can be used as braking device for high speed train, heavy duty car, truck and ordinary automobiles.

Description

technical field [0001] The invention relates to a preparation method of a desiccant, in particular to a preparation method of a special molecular sieve desiccant for an air brake system. Background technique [0002] Since the 1970s, developed countries have begun to develop pneumatic brake systems. There have been a large number of patent protections in the composition and preparation of air dryers for pneumatic brakes, the structure of dryers, and installation techniques. [0003] With the rapid expansion of the automobile industry in China, and the higher and higher requirements for the braking system of the train speed, it has become an urgent need to independently develop a pneumatic braking system with safety, reliability, high sensitivity, fast braking and large insurance factor. needs. Pneumatic brakes include: air-filled anti-skid brake system, air drying, air compressor unit and control valve. Among them, the air drying system can ensure that the whole system is ...

Claims

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Application Information

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IPC IPC(8): B28C1/10
Inventor 王鹏飞周永贤朱琳刘华
Owner SHANGHAI RES INST OF CHEM IND
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