Ethyl acetate moisture tester

Ethyl acetate moisture analyzer - solvent moisture content tester - KWLS-3000F

The quality of many solvents themselves has a great impact on the products produced, of which the moisture content is one of the important factors related to product quality. Take the ethyl acetate solvent as an example, because each mole of moisture consumes the same molar curing agent. In other words, in compound production, 1 part of moisture consumes 18 parts of curing agent, so the presence of trace amounts of moisture will cause great damage.

China's "GB3728-91 industrial ethyl acetate" stipulates that the moisture content of superior products is less than 1000ppm, the moisture content of first-class products is less than 2000ppm, and the moisture content of qualified products is less than 4000ppm.

Karl Fischer Coulometric instruments, the main principle: the use of chemical reaction after the change of conductivity calculation, complex structure, large volume, the highest determination accuracy, suitable for the determination of moisture content below 10000PPm. The instrument adopts LCD color 7-inch large-screen display, touch screen operation, intelligent human-computer interaction interface. Powerful new generation processor, dual CPU design, greatly improved computing efficiency. The design of the dual power supply channel separates the electrolytic electrode and the measuring electrode, the instrument can automatically remove all kinds of interference, and the resolution of 0.01 ug water greatly improves the precision of the test results, which can reach 0.001ppm.

Technical Specifications:

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Model:

KWLS-3000F

Measurement method:

Karl-Fischer Coulometric method

Display of measuring range:

0.01ug water - 9999.9999mg water

Water content range:

0.0001%—100% or 0.001ppm—106ppm

resolution:

0.01ug water

Display mode:

LCD color 7 inch large screen display

accuracy:

When the water content is 3ug water - 1000 ug water, the measurement error ≤±2 ug

When the water content is above 1000 ug water, the measured value error ≤±0.2% (excluding injection error)

End Point Indication:

The screen displays \Audible Warning\Printout\End Light Prompt

Blank handling:

The blank current microprocessor automatically controls the compensation to ensure that the blank can be accurately deducted within the sample enrichment time of 10 minutes

Mixing speed:

Adjustable controls

Drift compensation:

Microprocessor automatic control

Data entry:

Touch screen operation

Excessive moisture content of ethyl acetate can have the following effects on the composite quality:

　　(1) The moisture consumption of the curing agent makes the ratio of the main agent and the curing agent inaccurate, which affects the curing of the product and will appear sticky.

　　(2) Due to the reaction of moisture and curing agent, carbon dioxide is quickly generated, the infiltration of the adhesive is restricted, and it is easy to make the product bubble.

　　(3) Moisture grabbing curing agent can lead to the formation of polyurethane urea (R-NHCOHN-R) with high cohesion strength of the adhesive, resulting in the product prone to crystal point and hardening.

　　(4) The water dissolves into the solvent, slowing down the volatilization rate of ethyl ester, affecting the spread rate and hardening rate of the adhesive, and also easily causing solvent residues.

Karl Fischer moisture analyzer

1. After different types of rapid moisture analyzer testing of the same sample, the results are within the normal error range, which basically eliminates the doubt of the accuracy of the instrument.

2. Carefully inquire about the error with the moisture test results of other users, and find that the other party's test method is to use the Karl Fischer volume method or coulomb method to test the moisture of the sample. The results tend to be low.

3. The user cannot judge whether there are other volatile solvents in the sample in addition to moisture.

In summary, the basic reason for the error in the user's sample test process is that the user's sample has other volatile solvents in addition to moisture, and at the same time, according to the test temperature, other changes will occur.