Method of quantitative measurement of mechanical stability time (mst) of latex suspensions and the apparatus for use in the method
A technology of mechanical stability and quantitative measurement, applied in the direction of measuring devices, flow characteristics, instruments, etc., can solve time-consuming problems, achieve the effect of enhancing accuracy and reducing test duration
Active Publication Date: 2013-01-23
MALAYSIAN RUBBER BOARD
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Problems solved by technology
Besides being laborious and time consuming, these tests exposed lab technicians to noxious chemical fumes from preservatives commonly used in latex suspensions, such as ammonia in natural rubber latex
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[0062] Preparation of Latex Suspension Test Samples
[0063] Preparation of latex suspension test samples depends on the particular type of suspension to be tested. Generally, methods for sample preparation for qualitative testing of such suspensions are specified in ISO and ASTM standards.
[0064] For example, as previously mentioned, the standard tests for MST determination of natural rubber latex are those specified in Test ISO 35 and ASTM D-1076. These standards all state that the latex (concentrate) is first diluted with ammonia to a total solids content of approximately 55% and subsequently heated to a temperature between approximately 36°C and 37°C. The diluted and heated latex sample is then preferably filtered through a stainless steel strainer prior to testing.
[0065] Standard tests for the determination of the MST of synthetic rubbers are specified in ISO 2006 and ASTM D1417-90.
[0066] stir suspension
[0067] The stirrer 10 is arranged to be immersed i...
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Abstract
A method for the quantitative measurement of mechanical stability time (MST) of a latex suspension comprises the steps of providing a load force measuring apparatus for automatic quantitative measurement of MST of the suspension; agitating the suspension at sufficient speed so as to cause changes in the physical properties of the suspension; measuring and monitoring the changes in physical properties of the suspension by way of the load force values detected and transmitted to a control means; and automatically calculating the MST of the suspension by normal distribution analysis of the collected load force value data. An apparatus for use in the method comprises a vessel (20) for containing the suspension; an agitator (10), the agitator provided to be submerged in the suspension in use and capable of agitating the suspension at sufficient speed so as to cause changes in the physical properties of the suspension; a rotatable base (30) for holding the vessel, the vessel being removably coupled to said base; and a connector (50) operatively connecting the rotatable base to a sensor (60). The sensor is capable of detecting and transmitting the load force values resulting from agitation of the suspension to a control means. The control means automatically calculates the MST of the suspension by normal distribution analysis of the collected load force value data.
Description
technical field [0001] The present invention relates to a method for measuring the physical properties of latex suspensions. [0002] More specifically, the present invention relates to a method for the quantitative measurement of the mechanical stability time (MST) of a latex suspension, and a device used in said method. Background technique [0003] Mechanical stability is defined as the ability of a colloidal suspension to resist the colloidal disturbing effects of mechanical forces such as shear and agitation. The mechanical stability of colloidal lattices is a very important industrial property. [0004] For latex, the impact of its mechanical stability on the pumping, conveying and processing of latex is that the latex must have sufficient mechanical stability to resist the shear forces that occur during handling and processing without undergoing colloidal disturbances . [0005] Like paints, plastics and other colloidal suspensions, the mechanical stability of thes...
Claims
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IPC IPC(8): G01N33/44G01N15/00
CPCG01N15/04G01N11/14G01N33/445
Inventor A・B・奥斯曼M・K・A・B・奥姆兰M・N・B・曼索
Owner MALAYSIAN RUBBER BOARD