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 Intrinsic Viscosity of ACR

Determination Intrinsic Viscosity of ACR

First, equipment and auxiliary equipment

① Φ0.56mm a Ukrainian viscometer

② a set of automatic viscometer (25 ℃ ± 0.01 ℃)

③ 3 # sand core funnel 3 (covered)

④ conical flask 3

⑤ 75ml volumetric flask 3

Second, reagents: analytical grade (chloroform), content ≥ 99.0%

Third, the intrinsic viscosity of the sample test: 1, configuration solution 2, measured viscosity

1, configure the solution

① measuring bottle logo: the required capacity of 75ml three bottles (should be kept dry) clearly identified by the number.

Note: High viscosity is used separately from the volumetric flask used for low viscosity samples.

② balance calibration: Calibrate the balance, adjust the level (adjust the bottom of the balance knob so bubbles in the middle of the circle), with 200 grams weight calibration;

When adjusting the balance, or weighing, you should close the doors, windows, etc., at the same time shut down the balance door to prevent the wind from affecting the balance. When weighing, the balance can be read after the number of stable, prohibit the balance of data beating larger than reading.

 '¢ with liquid: open in Wang automatic dosing device DP25 and the DP25 and electronic scales connected to the sample bottle into the electronic balance and add 0.075g ± 0.01 ɡ expected in the automatic dial-up device DP25 touch screen settings The required concentration of 0.003g / ml, click the dosing button to complete dosing.

④ Sample Dissolution: Place the sample bottle containing the concentration solution in P12, and set the sample-dissolving time. The sample is dissolved automatically by P12.

2, Viscosity Testing:

① open the viscosity of the instrument set sink temperature 25 ℃ (Chung Mong Intelligent Viscosity Measurement System IVS300 series temperature control accuracy of ± 0.01 ℃), to be stable after the temperature field into the chloroform solvent with Ubbelohde viscometer (with basket) Click the start test, the system will automatically complete the continuous test and remove the unqualified data, get T0; the same way to measure the sample solution Flow time t.

② measure the t value of other bottles: the same way to measure the viscosity of the remaining two samples (tools can not be mixed).

③ by the viscosity of the software obtained in the sample viscosity of the sample solution.

Fourth, tool cleaning:

① Ubbelohde viscometer after use, the amount of chloroform 50ml beaker to take 25ml of chloroform added to the viscometer, use the ear wash up, then blow down, repeated three times (Note viscometer is not allowed to use water scouring, if water enters Should be dry), Ubbelohde viscometer upside down in the folder after the clip on the butterfly.

② volumetric flask and sand funnel were washed, with a 50ml beaker to take 25ml of chloroform into the volumetric flask, and then repeatedly shaken several times; sand funnel also 25ml chloroform wash shampoo, then wash the ear ball from the mouth Blowing out the waste a few times; Erlenmeyer flask with chloroform.

Note: All waste liquid into the waste collection bottle, warehousing unified treatment, after cleaning, measuring flask, sand funnel inverted placed in the tool plate, rack.

Ubbelohde viscometer diameter and applicable solvent list

Capillary diameter mm: 0.37; Applicable solvents: Dioxane

Capillary diameter mm: 0.38; Applicable solvent: chloroform

Capillary diameter mm: 0.39; Applicable solvents: acetone

Capillary diameter mm: 0.41; Applicable solvent: ethyl acetate

Capillary diameter mm: 0.46; Applicable solvents: Ding Ding acetate, acetone (1: 1

Capillary diameter mm: 0.47; Applicable solvent: tetrahydrofuran

Capillary diameter mm: 0.48; Applicable solvents: n-heptane

Capillary diameter mm: 0.49; Applicable solvents: dichloroethane, toluene

Capillary diameter mm: 0.54; Applicable solvents: chlorobenzene, benzene, methanol, p-xylene, n-octane

Capillary diameter mm: 0.55; Applicable solvents: butyl acetate;

Capillary diameter mm: 0.57; Applicable solvents: dimethylformamide, water;

Capillary diameter mm: 0.59; Applicable solvents: dimethylacetamide;

Capillary diameter mm: 0.61; Applicable solvents: cyclohexane, dioxane

Capillary diameter mm: 0.64; Applicable solvents: ethanol;

Capillary diameter mm: 0.66; Applicable solvents: nitrobenzene

Capillary diameter mm: 0.705; Applicable solvents: cyclohexanone

Capillary diameter mm: 0.78; Applicable solvents: o-chlorophenol, n-butanol

Capillary diameter mm: 0.80; Applicable solvents: phenol, tetrachloroethane 1: 1;

Capillary diameter mm: 1.07; Applicable solvent: m-cresol

Tags: viscometerviscosityviscosmeterubbelohde viscometermolecular weight

Using Ubbelohde viscometer to measure the molecular weight of polyacrylamide

Test Method: Use 85g / L sodium nitrate solution will be configured as a dilute solution sample, with Ubbelohde viscometer to determine the ultimate viscosity, according to empirical formula to calculate the molecular weight of the sample.

Reagent solution: 85g / L sodium nitrate solution

Equipment: Ubbelohde viscometer (capillary diameter 0.55mm)

Constant temperature water bath (can control 30 ℃ ± 0.1 ℃)

Stopwatch (division 0.1s)

Acid filtration funnel

The company is located in:

Experimental steps:

1. Determination of sodium nitrate solution outflow time

The clean, dry Ubbelohde viscometer vertically placed 30 ℃ ± 0.1 ℃ constant temperature water bath so that the U-viscometer D ball all submerged under the water.

Will be filtered through acid filtration funnel sodium nitrate solution was added to the Ubbelohde viscometer filling line between G, so far, constant temperature 10min-15min.

M tube set a hose, with the clip, use the ear ball to the sodium nitrate solution into the D ball half, remove the ear wash ball, open the M tube.

Measure the time it takes for the sodium nitrate solution to flow through the timed markers E, F with a stop watch. Repeated determination of three times, the error does not exceed 0.2s, whichever is the average t0.

2. Preparation of sample solution

Weigh 0.03 g of solid sample or equivalent amount of colloidal sample from a known 50 mL dry beaker to the nearest 0.2 mg and dissolve with sodium nitrate solution. All transferred to 100mL volumetric flask, diluted with sodium nitrate solution to the mark, shake.

3. Determine the outflow time of the sample solution

The outflow time t1 of the sample solution is determined by the first step method

4. Calculate the result according to the formula

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

Various viscosity measurement formula

Kinematic viscosity: V = K * (t-Δt)

Dynamic viscosity: η = K * (t - Δt) * ρ

Limit Viscosity --- ISO 1628/1 Schulz-Blaschke formula: [η] = I / (1 + K '· I · C)

Ultimate Viscosity --- Huggins Formula: [η] = [(1 + 4KHηsp) 1/2 -1] / 2KH · C

Ultimate Viscosity --- Kraemer Formula: [η] = [1 - (1 - 4β lnηr) 1/2] / 2 β · C

Solvent-Solomon-Ciuta equation: [η] = [2 (ηsp-lnηr)] 1/2 / C

Limiting viscosity number --- Malone Maron formula: [η] = (γlnηr + ηsp) / (1 + γ) · C

The ultimate viscosity --- Dong's formula [η] = (2lnηr + ηsp) / 3 · C.

Limit Viscosity --- Billmeyer formula: [η] = (3lnηr + ηsp) / 4 · C

Limiting viscosity - Martin Martin Log I = log [η] + K [η] · C.

Limit Viscosity --- Linear Extrapolation: Measure the viscosities and logarithm viscosities of more than three different concentrations of dilute polymer solutions for linear extrapolation to determine the limiting viscosity.

Relative viscosity: ηr = (t - Δt) / (t0 - Δt0)

Viscosity number: I = (ηr-1) / C

K value for polyvinyl chloride and polyvinyl alcohol according to the Fickentscher formula: K = 1000 {a - 1 + [1 + (2 / C + 2+ a) a] 1/2} / (150 + 300C)

Where: a = 1.5 logηr

The above limit viscosity number measurement, such as the input Mark -houwink formula K, α value can be calculated viscosity average molecular weight.

M = ([η] / K) 1 / α

Gods in his heaven, all's rights with the world.

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