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.

The Daily Maintenance of Magnetic Stirrer

The Daily Maintenance of Magnetic Stirrer

Magnetic stirrer is an instrument works under the principle of mixing the material. Suitable for the viscosity is not very large solid-liquid mixture or liquid in the physical magnetic. In the daily usage if the magnetic stirrer broken, we need to calmly deal with, do not be anxious. Some treatment and methods can be used to determine the cause of the failure, so the daily use of magnetic stirrer in the process must also pay attention to do maintenance of magnetic stirrer, extend the equipment Of life as much as possible.

First, the routine maintenance

1.       First static then dynamic: determine the electrical equipment buttons, transformers, thermal relays and the fuse is good or bad, to determine the fault position when the device is not powered. Power test, listen to the sound, test parameters, determine the fault, then maintenance. If the motor phase is missing, if the measured three-phase voltage value can not be identified, it should listen to the sound, individually measured each relative to the voltage, to determine which phase defects.

2.       First the general then special: due to assembly quality or other equipment failure caused by failure, generally account for about 50% of common faults. Electrical equipment, special failures are mostly soft faults, rely on experience and instrumentation to measure and repair.

3.       First cleaning then repairing: for the heavy pollution of electrical equipment, clean its buttons, wiring points, contact points, check the external control keys are malfunctioning. Many failures are caused by dirt and conductive dust.

4.       First Machine then electrical: only in the determination of mechanical parts without failure, and then electrical inspection. Check the circuit failure, you should use the detection equipment to find the fault location, to confirm no contact failure, and then targeted to see the relationship between the operation of the line and machinery to avoid misjudgment.

5.       Thinking first before moving hands: for electric stirrer failure, should not rush to the first hands-on, ask the reason of fault. For unfamiliar equipment, should also be familiar with the circuit principle and structural characteristics, to comply with the corresponding rules, before you disassemble. Familiarize yourself with the function, location, connection, and relationship with other devices in each electrical component. In the absence of an assembly diagram, you should dismantle and sketch the mark.

6.       First debugging then fault: debugging and fault coexistence of electrical equipment, should first remove the fault, and then debugging, commissioning must be carried out under the premise of the electrical line speed.

7.       First external then internal: should first check whether the equipment obvious cracks, defects, to understand its maintenance history, life, etc., and then check the machine internal. Before the demolition should be excluded from the surrounding fault factors, identified as the machine after the failure to disassemble, otherwise, blind disassembly, the equipment may repair the worse.

8.       First power then equipment: the power part of the failure rate in the entire fault equipment accounted for a high proportion, so the first maintenance power can often be more with less.

Second, the maintenance when working

1.   It is best not to let the instrument works in the absence of heating liquid.

2.  The machine should be checked before the operation of the ground, to ensure that after the completion of work.

3.  In order to ensure no damage to the instrument, usually the instrument will be placed inside the insulation material, so the first time we use the magnetic stirrer will find a little smoke or pungent taste, it is normal. Not the Product quality problems, but Keep it ventilated.

4. The magnetic stirrer inside the device heating the upper limit, so in the heating time must be taken into account, the best way is to ensure that the machine is not only heating, and remember the state of the motor into a rotating state, so that The greatest degree of protection of magnetic stirrer.

5.   After the completion of heating, turn off the heat first, and after the temperature has been dispersed and then close the mixing.

6.   To ensure that the environment of the dry. Because in a humid environment, the instrument easily leads to leakage and other phenomena, which is why we must ensure that the instrument grounded, if the instrument is very wet when you must use hot air dry.

7.   The operation must be careful, do not be burned, because the general temperature is relatively high.

8.  For the sake of safety equipment on the back of a fuse, the device is still working after the power can check whether the need to replace.

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

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

Coyp right by @Hangzhou Zhongwang Technology CO.,LTD