px998866
Dołączył: 29 Lip 2010
Posty: 213
Przeczytał: 0 tematów
Ostrzeżeń: 0/5
Skąd: rbuccu
|
 Wysłany: Pią 23:19, 31 Gru 2010 Temat postu: ugg boots günstig Performance Evaluation of PVC h |
 |
|
,[link widoczny dla zalogowanych]
Performance Evaluation of PVC heat stabilizers
. The national standard is GB2409-1980 (plastic yellow index test method \and near-white opaque plates, sheets, film-like and powder, granular sample, does not apply to the plastic containing fluorescent substances. while the clear plastic, its transmission function of the thickness of the yellow index, only the same thickness The following can be compared. colorimeter can use a simple, fast, intuitive way to detect different 3 Wang governance, and so on. PVC heat stabilizers performance evaluation of the color difference between the 55 items, the sample by measuring the color difference meter 3 stimulus values, and conversion, display color space such as CIELAB data. CIELAB color space,[link widoczny dla zalogowanych], color, color with a lightness index L and the commodity index t2 \Kok said) and saturation (the point of origin to the distance axis). CIELAB color space, color difference is calculated as type (2) △ E = [(AL) 2 + (aa32 + (△ 62】 m (2)-type in: A one color space CIELAB color difference of two colors; AL 'a CIELAB color space and two color difference between the brightness index; Aa \b and n2., 6 difference. the relevant national standards GB/T7921-1997 \, the main processing is based on a certain temperature and certain shearing, PVC plastisol melt or by melting, gel properties and rheological behavior of the. For non-plasticized and plasticized PVC, can be double roller plastic necklace, torque rheometer and extrusion tests and other methods to evaluate the process, but these methods are not relevant national standards. for increasing plastisol, or by rotational viscometer measurement laboratory coating machine plastisol viscosity. double roller plastic refining method and the torque rheometer method has been dynamic in section 2.2 have been described in the thermal stability of the double roller plastic refining method can be intuitively feel and understanding of the plastics samples performance,[link widoczny dla zalogowanych], precipitation of, viscoelastic, etc., but the experiment influenced the subjective factors and difficult to quantify. equipped with mixer torque rheometer method by comparing the melting time of different samples, melting torque, equilibrium torque, and melt body temperature and other data to evaluate the performance of the sample processing. ASTM2538-02 also provides a rapid assessment of the stability of the sample cut its key points are: the required steps to try to feed into the set temperature has been constant mixer, through the procedures already set the speed of the rotor within the 1min by the O ~ 100r/rain, recorded a speed torque curve, shown in Figure 2. from 50r/rain torque value corresponding to the coordinate origin to make a diagonal, called the reference curve, the reference curve at the top of the curved bottom of the triangle area A and area B the ratio of S is called the shear sensitivity index. S value of greater sensitivity to the larger shear specimen, apparently, for the Newton fluid, then S is zero, that is curved area of A is zero. g 5U speech speed / r ・ nlin-. Figure 2 speed torque curve of a system if used extruder torque rheometer, the capillary can be used Die head measuring the melt viscosity of PVC compounds, with the shear rate or (and) the rheological properties of temperature change can also be used with the actual production of similar die and auxiliary device, such as extruded sheet, tubing,[link widoczny dla zalogowanych], etc. to evaluate the processing performance. In short, the rotor rheometer has good reproducibility and resolution, the samples can be quantitatively evaluated the rheological properties,[link widoczny dla zalogowanych], but also to simulate the actual production process. plastisol viscosity determination of national standards are GB/T12004.3-1989 \. \kind of poured out of rheometer, the adjustment to the specified temperature, at different pressures, measuring the rate of paste flows through the die, pressure and flow rate calculated by the apparent viscosity. applicable to the determination of when the high shear rate apparent viscosity. GB12004.4-2003 \Continued)
More articles related to topics：
mbt schuhe günstig Liby _2041 2008 Paralympic Gam
tory burch flats Coumarone - indene resin in makin
ghd haarglätter Regenerator checker deformation an
Post został pochwalony 0 razy
|
|
