Übersetzung für "Viskositätsverlauf" in Englisch

The initial viscosities of the starch formulations and the viscosity development over time were recorded.

The viscosity curve during precipitation is shown in FIG. 5.

The viscosity curve is hypothetical, but it resembles the typical curve of a borosilicate glass.

The phase inversion therefore begins at a maximum on the viscosity curve.

Instead, their viscosity variation as a function of temperature is irreversible.

If desired, the viscosity trajectory may be monitored by in-line viscosity measurement techniques.

Optical: homogeneity and viscosity changes were assessed as to their dependence on time.

Thus the viscosity profile shifts further to lower temperatures due to the use of OH-containing SiO 2 grains.

DETAILED DESCRIPTION OF THE INVENTION The temperature at which cross-linking begins is easily recognized from a rise in viscosity as the variation of viscosity is followed in dependence upon temperature.

The variation of viscosity with temperature of the coating materials used in the Examples is illustrated in FIG. 1.

The reaction mixture is left to react for 8.5 hours at an internal temperature of 235° C./0.1 bar nitrogen excess pressure, samples are removed from the reaction mixture at 2-hourly intervals for analysis purposes, viscosity is measured and the reaction mixture is worked up as described in Example 1.

The viscosity course of the lacquer mixtures was followed by means of the outflow time in a DIN-4 beaker (DIN 53211), (Table III).

The viscosity changes are not uniform at the beginning of the reaction, during an induction period that may last from about five minutes to approximately one hour, depending upon the temperature.

Changes in the viscosity of these reaction resin mixtures (1-7) were periodically measured after storage in closed vessels. Storage and measurement took place at room temperature.

As can be easily seen, these parameters will be strongly influenced not only by the nature of the hardener, its amount and reactivity depending on the amount of free protons and the existing acidity, but also by the course of the viscosity, which depends on the content of water and the initial viscosity.

Thus in the compression moulding process pressure and temperature must be altered in accordance with the reaction mentioned, in order to obtain the desired viscosity profile in the resin matrix.

It can be seen from the viscosity profile that viscosity has perceptibly decreased after 10 minutes' reaction time.

Thus, e.g., the rheology (course of the viscosity during application, pseudo-plasticity, thixotropy, levelling and run-off properties) of conventional lacquer systems is to be purposefully controlled by relatively simple means via the evaporation behavior of the employed organic solvents or solvent mixtures, respectively.

The viscosity profile of the mixture was determined over a period of approximately 60 minutes (Table 1).

From Table 5 there can be noted—for the phenolicly curable epoxy resin molding material 19—the influence of the nature and concentration of the reaction accelerator on the course of the viscosity.

From Table 6 there can be noted—for the phenolicly curable epoxy resin molding materials 3, 19, 20 and 21—the influence of the molar ratio of phenolic hydroxyl groups to epoxide groups (OH:EP) on the course of the viscosity.

Thus, for example, the rheology (viscosity behavior during application, pseudoplasticity, thixotropy, leveling and run-off properties) of conventional paint systems can be selectively controlled by relatively simple means via the evaporation behavior of the organic solvents or solvent mixtures used.

By measuring the viscosity of the samples with a Haake VT 24 Viskotester at 80° C., the viscosity trend is recorded in a prepared viscosity/reaction time diagram.

Laminar flow behavior is appropriately checked by starting from a 0.1 to 1.5% strength by weight aqueous solution of the polyacrylate at +20° C., 0° C. and -10° C. and a pH value of 7.5 to 10, preferably 8 to 9.5, and determining the viscosity curve of the solutions by means of a high shear rotary viscometer, the shear rate being taken from 0 seconds-1 up to a region of high shear rates.

The continuous line in the diagrams of Examples 1 to 20 serves as a comparison of the current changes in viscosity of the corresponding two-component polyurethane system without the addition of the mixture of (C) and (D).

On account of the special content of large cations (Ba 2+, Sr 2+) in the borosilicate base glass at relatively high Al 2 O 3 contents, the galsses of the invention exhibit a low thermal expansion and very favourable viscosity/temperature profiles, i.e. a steep viscosity profile in the transformation range and a flatter viscosity increase in the processing range.

The kinetics of the polymerization—on which the viscosity course over time depends—and the dissolution speed can be coordinated with each other in such a way that the absorbent and/or saturable material only dissolves once the viscosity of the reaction mixture is sufficiently high, so that the reaction mixture remains in the area of the mold and cannot flow out of it again.