Requirements for Detection of parallel samples

1. UV. Determination of the content required for the test two, if the control method, the reference also requires two, the absorption coefficient method is also two. The deviation of each result from the average value is within 0.5%.

2. Atomic Absorption. In the case of a quantitative test, two aliquots are prepared for each test sample, three times for each injection. RSD should not be more than 3%, graphite furnace properly relaxed, large dispersion can be measured several times to increase the reliability of the reading. 3% here, I personally consider it a RSD requirement of three injections per sample instead of a parallel sample. I do not know what people think.

3. Fluorescence analysis. parallel samples need to be done, the results of the average deviation within ± 1.5%.

4. Melting point detection. Each test at least 3 repeated measurements, 3 readings within 0.5 degrees to poor. If the test three times the difference between exceeding 0.5 ℃, or the average margin in the edge, the need to re-test twice, according to the average of five times the correction value calculation results. Melting point standard to be measured twice, the difference is less than 0.3%.

5. Pour point. need to be measured twice, but no bias limit requirements.

6. Polarimetry. Determination of specific rotation than the same sample and the blank each measured three times, take the average. Determination of content required parallel samples, and two parallel samples within the range of 0.02 °.

7. Refraction. Requirements of the same sample and blank each measured three times.

8. Viscosity.

8.1 Ping Viscometer. Prepare two parallel samples each measured three times, and these three measurements shall not exceed the average value of 5%.

8.2 Rotary Viscometer. No requirement.

8.3 Ubbelohde Viscometer. Prepare two parallel samples each measured twice, and these two measurements shall not exceed 0.1S. The results for both samples do not exceed 1% of the average, if more than two additional retestings are required.

9. PH. Prepare a sample and measure it twice, with a difference of no more than 0.1

10. Non-aqueous titration. The test should be not less than 2 copies. The direct use of perchloric acid raw material titration, the relative deviation of not more than 0.2%. Alkali titration solution titration, the relative deviation of not more than 0.3%. Preparations need to be extracted or evaporated to dry titration, the relative deviation of not more than 0.5%. Such as extracting the washing operation is complex, the relative deviation of not more than 1.0%.

11. Nitrogen content. for the test sample should be determined 2 copies, the constant nitrogen relative deviation should not exceed 0.5%. Semi-trace nitrogen relative deviation of not more than 1.0%.

12. Determination of ethanol (gas phase method). two copies of the test, the relative average deviation of not more than 2.0%.

13. hydroxyl value, iodine value, saponification value. parallel determination of 2 parts, the relative deviation of not more than 0.3%.

14. acid value, peroxide value. only a measure.

Kent Yuan (Mr.) Hangzhou Zhongwang Technology Co., LTD. Skype: kenyuan9023   Wechat/WhatsApp:+86 15068109723E lei@zonwon.com  W www.zonwontech.com

Determination of viscosity of polymer by using Ubbelohde viscometer

Abstract: viscosity experiment notes: 1) the temperature of constant temperature water bath has a great influence on viscosity measurement. The temperature fluctuation of water bath should be within the range of + 0.05 DEG C, and the temperature of the water in the constant temperature water bath should be uniform. 2) capillary Ubbelohde viscometer must use clean liquid soaked and washed with water, can be used for drying the rear 105. 3) must be fixed on the vertical viscometer in constant temperature water bath. Otherwise, it will affect the velocity of flow and cause the error of measurement result. 4) after each dilution, the liquid in the viscometer must be mixed evenly. The method is to clamp the hose of the C tube, receive the gas from the B tube, mix the liquid in the D ball of the viscometer evenly, and then rinse the liquid in the D ball.

1. Basic principles

1.1, the viscosity of polymer solutions has the following definitions:

(1): relative viscosity ηr representation as . Among them, η0, it’s the pure solvent viscosity. η is the viscosity of solutions at the same temperature. ηr is a dimensionless quantity.

For low shear rate polymer solutions, the values are generally greater than 1. Obviously, with the increase of the concentration of ηr solution will increase.

(2): specific viscosity: indicated by ηsp, is compared with the solvent viscosity increase the fraction.

(3): Specific viscosity（）

Ratio of solution to specific viscosity to solution concentration

                          

The viscosity of the solution when the solution is infinitely diluted is independent of the concentration, and its dimension is the reciprocal of the concentration cm3/g

1.2 One point method

2. Device diagram

As a common three branch glass viscometer.It has a capillary with a diameter of R and a length of L. At the top of the capillary there is a small ball with a size of V. There are lines a and B on the top and bottom of the ball. In the experiment, the C pipe is closed when the liquid is pumped from the A tube to the B tube, and then the C tube is passed through the atmosphere so that the liquid level at the lower end of the capillary drops. The liquid in the capillary forms a gas suspension column and flows down the pipe wall at the lower end of the capillary. This can avoid the exit turbulence as possible, and the equivalent average (which is the liquid column to suspension column height) with A tube liquid level.

Following the principle of determination of the viscosity of the liquid to be tested: adding self A tube, B tube by liquid suction to the a line above the B pipe through the atmosphere, let it flow down, record level through a and B line t.

3, Operation procedures and matters attention

Take the measured liquid along the inner wall of the tube into the A viscometer ball D. The viscometer is vertically fixed in a constant temperature water bath. Water temperature should be 25 - 0.05 DEG C, the water level higher than the buffer (upper B tube ball ball), placed 15 minutes, B tube and C tube are respectively connected with a latex tube, C tube hose clamp, B pipe mouth pumping; the test solution level increased to buffer the ball slowly part of the first open B nozzle, and then release the C nozzle, the test solution in the tube falls naturally, with a stopwatch accurate record level self-testing a down to fixed line by line B at the outflow time, were determined for two times, two times the difference should not exceed 0.1 seconds, averaged two times for the test solution the outflow time (T).

Matters needing attention：

1) the temperature of the constant temperature water bath has a great influence on the viscosity measurement. The temperature fluctuation of the water bath should be within the range of + 0.05, and the temperature of the water in the constant temperature water bath should be uniform.

2) capillary Ubbelohde viscometer must use clean liquid soaked and washed with water, can be used for drying the rear 105.

3) must be fixed on the vertical viscometer in constant temperature water bath. Otherwise, it will affect the velocity of flow and cause the error of measurement result.

4) after each dilution, the liquid in the viscometer must be mixed evenly. The method is clamped C pipe hose, B tube gas, the mixed liquid D in uniform ball viscometer, ball, and then pumped D buffer liquid in the washing ball viscometer determination of ball (A and B line between the ball on the B tube), capillary 2-3 times.

Kent Yuan (Mr.) Hangzhou Zhongwang Technology Co., LTD.

P  /Wahtsapp: +86 15068109723  E lei@zonwon.com

Coyp right by @Hangzhou Zhongwang Technology CO.,LTD

What instrument can be used to measure kinematic viscosity?

The kinematic viscosity is the viscosity of the fluid and the same temperature of the fluid density ratio. The unit is (m^2) /s. Use the lower case letter v.

There are three methods for determination of viscosity, kinetic viscosity, kinematic viscosity and conditional viscosity.

Dynamic viscosity: ETA t two liquid layer is 1 cm apart; the area was 1 (CM) relative speed of 1 cm / sec generated resistance units for g / cm / sec. 1 g / cm sec =1: general industrial dynamic viscosity unit expressed by poise.

Kinematic viscosity: when the temperature is t degrees centigrade, the kinematic viscosity is indicated by the sign gamma. Kinematic viscosity is widely used in the determination of jet fuel oil, diesel oil, lubricating oil and other liquid petroleum products, petroleum products after use of lubricating oil, crude oil viscosity, viscosity was determined by capillary viscometer method.

IVS300 Viscometer

 Hangzhou Zhongwang Technology Co.,LTD designed the automatic test instrument IVS300 based on ISO1628/ ASTM D 2857. This machine was widely used in polyester (PET), quality control and testing of raw materials, nylon, silicone polymers such as polyacrylamide industry, containing all the viscosity of the formula can be obtained directly by viscosity, viscosity, relative viscosity, characteristic viscosity and viscosity average molecular weight of the.

In the kinematic viscosity automatic tester IVS300 system uses the modular design, mainly by the viscosity measurement unit, precision constant temperature bath, through the cooler and the main controller and the viscosity of special software modules;

Automatic Viscometer Measuring Unit

Each measuring unit is an independent system, and all test procedures are completed by each test head. The test unit and the main controller are connected only through one data line;

The pressure method is adopted to lift the sample; the loading and unloading of the viscosity tube adopts a unique pressing block mode;

The pump pressure can be automatically adjusted by software according to the viscosity of the sample;

The measuring fiber is made of stainless steel smart fiber, which can automatically change the intensity of the fiber because of the different colors of the sample; 

The viscosity thermostat is designed and the measuring zone isolation constant temperature zone, will affect the temperature of the bath temperature in the process of fluctuation on the measurement is reduced to the minimum, to ensure a constant level measurement of temperature field and temperature region;

Constant Water Bath

Viscosity constant temperature tank has high and low water alarm function. The inner tank is made of mirror stainless steel, large double toughened hollow glass observation window and LED lighting;

Cooler adopts the most advanced PTL refrigeration technology, continuous operation life of more than 50 thousand hours.

IVS300 Software 

Hangzhou Zhongwang Technology Co.,ltd Software is very powerful, with all sectors of the different viscosity formula, including the Bill Meyer formula / Hagen Poiseuille formula / formula / Hagens Mark Houwink formula / Martin / Solomon - Xiuta formula formula. Customers can be automatically calculated according to needs; Chinese menu; unattended after starting, automatic continuous testing, until the finish of the test data; intelligent identification, such as measurement data does not match the user requirements with buce function; software with rights management, protection of important data will not be free to modify the instrument;

Technical parameter

1. Bath temperature fluctuation uniformity: + 0.01

2. Bath control temperature range: 5-55 DEG C

3. Ting accuracy: 0.01S

4. Measuring viscosity range: 0.35-5000 mm2/s (specific range of use and supporting viscosity tube related)

5. Time measurement range: 0... 9999.99S

Kent Yuan (Mr.) Hangzhou Zhongwang Technology Co., LTD. P  /Wahtsapp: +86 15068109723  E lei@zonwon.com

Coyp right by @Hangzhou Zhongwang Technology CO.,LTD