DE1794380B2 - Use of chrysotile asbestos as a thixotropic thickener excretion from 1619771 - Google Patents

Description

The following examples are intended to provide a more detailed explanation of the invention.

example 1
15th

Production of

The use of asbestos as a thickening agent in jet-milled chrysotile paste

for the production of lubricating greases from lubricating oils

is already known per se, for example from the In a commercially available jet mill with a

USA.-Patent 3 010 896 and from an attachment 20 grinding chamber diameters of 20.3 cm were made by CJ B o η er, "Manufacture and Application, a Venturi injector (with compressed air from 10.5 to of lubricating greases". 17.5 kg / cm ² ) chrysotile asbestos particles with a

It has now been found that a substantial rate of about 25 g / min was introduced. In the improved thickener for liquids, in the case of the jet mill, the vortex body made of asbestos for the production of thixotropic lubricating particles was obtained for the production of a turbulent, fat or thixotropic paint or a mass of air at room temperature with a pressure, is obtained, when blown in by about 21 kg / cm ^2. The finely divided chrysotile asbestos was ground in a jet asbestos fibers in a bag catcher from the mill. After treatment in the jet air stream separated.

mill, the asbestos is in the form of fine fibers Diameter is in the colloidal range. materials are shown in Tables 1 and 2 below

The chrysotile asbestos fibers can thereby be specified.

put that one under positive pressure and at a tem- The particle size of the starting material is only

Temperature between room temperature and 650 ° C is limited to the extent that the material must be able to be introduced into the Venturi moving body from an injector in a gaseous medium. Excessively large asbestos-suspended asbestos particles are produced and in this area, further gaseous medium can be thrown into the continuously further gaseous medium in a number of required areas to reduce the fiber length, with a temperature in the above mentioned range.
Area and high speed under generation

strong turbulence in the body and thus less than 40 B e i s ρ i e 1 2

Comminution of the suspended particles introduces the ,,, ■, ^,

crushed asbestos particles together with the gas thickening of polyesters

shaped medium continuously withdraws and the fine resin was made using a liquid polyester resin

Separating asbestos particles from the suspending gas. a viscosity of 150 to 20OcP at 25 ⁰ C (ge-AIs suspension medium, air and steam are preferably measured in a Brookfield viscometer with a spindle. No. 2 at 20 rpm) and one set to 41 %

Styrene contents are suitable for crushing the asbestos particles. Used as a thickener Jet mills of known type. One of the chrysotile asbestos fibers produced according to Example 1 is preferred Jet mill, in which relatively large part used. The polyester was made with the thickening suspended in a gas medium and mixed by a 50 medium and the viscosity increase at internally arranged base to be vortexed and 6 rpm and 60 rpm was in Brookfield viscose the vertebral body measured further gas under generation meter. The viscosity of the thickened resin of turbulence in the body and under crushing was done immediately and after 7 days of storage at tion and attrition of the particles is introduced. 38 ° C determined. The settling power of the thickened

The jet mill is determined when using 55 polyester resins by measuring the excess air as a gaseous grinding medium with liquid,
a pressure of about 7 to 35, and preferably 7 to

21 kg / cm ² (above atmospheric pressure) operated. The bis ο ie 1 3

Additional air that creates turbulence can be mixed with a

Pressure of about 7 to 35 kg / cm ² , preferably about 60 thickening of polyepoxides

10.5 to 17.5 kg / cm ² , are introduced into the vertebral body containing the asbestos particles. The preferred resin is a liquid polyepoxide with room temperature air. Viscosity from 400 to 60 ocP at 25 ° C and with The average particle size can be used by regulating the air speed and temperature by regulating the air speed and temperature so that the asbestos feed rate varied according to Example 1 Chrysotile asbestos fiber was like to be. The product can be determined in any of the ways in Example 2. The results can be found in the suspending medium separated; in front of the following table 2.

I 794 380

Table 1

No. Kind of used
Chrysotile asbestos Parts thickener each
100 parts
polyester Viscosity in el
measured immediately 60 rpm after
7 days Deductibility,%
supernatant liquid
after 7 days 6 rpm 800 6 rpm 1 Chrysotile asbestos *} 0.25 1800 690 2000 : o, o 2 Arizona filter 0.3 1600 1800 9.5 quality FM-3 940 3 Quebec Lake- 0.45 2500 2800 5.3 Asbestos 7D5 950 4th Chrysotile asbestos *) 0.3 2600 1880 2800 3.8 5 Californian 1.5 3000 3600 3.5 Coalinga 820 6th South African 1.2 1800 1600 4.0 blue crocidolite

*) Partly defibrated by acid treatment.

Table 2

Kind of used
Chrysotile asbestos Parts thickener
100 parts each
Polyepoxide Viscosity in cP
measured immediately
6 rpm | 60 rpm 3400 after 7 days
at 54 ° C
6 rpm Deductibility,%
protruding
liquid
after 7 days Californian
Coalinga 2.0 10 200 12 600 4.2

Claims (1)

alternatively, bag catchers or bag filters find patent claims: Turn, however, can also be cyclone separators or other separators are used. Use of chrysotile asbestos fibers compared to the previous one as a thickening agent Diameter in the colloidal range, which shows the asbestos set by the jet milled chrysotile Milling of chrysotile asbestos into an asbestos in the form of fibers with a diameter of Jet mill can be obtained as a thixotropic colloidal bar rich in particular significantly improved Thickener. thixotropic properties. A measure of this is that Thixotropy index, i.e. H. the ratio of the viscose silo would do at 6 and 60 rpm.