Method for quickly determining ash content in sulfenamide vulcanization accelerator

Abstract

The invention relates to a method for quickly determining ash content in a sulfenamide vulcanization accelerator, the method comprises the following steps: using a conductivity meter to determine the conductivity of deionized water to obtain conductivity C1 of the deionized water at 25 DEG C, taking a sulfenamide accelerator sample, adding the sample into the deionized water, mixing evenly, then standing for 2min-10min to prepare a sample solution, and then using the conductivity meter to determine the conductivity of the sample solution to obtain conductivity C2 of the sample solution at 25 DEG C; and according to a formula W=K2(C2-K1*C1)*% to calculate the ash content in the sulfenamide vulcanization accelerator; the method for quickly determining the ash content in the sulfenamide vulcanization accelerator is simple and practicable and is convenient to operate, and the detection time is short; and through use of the method, the ash content determination of a single sample takes about 10 min, the ash content determination of batch sample takes about 5 min-8 min, compared with a method specified in national standard GB / T11409, the detection time is substantially shortened, the ash content being qualified or not can be quickly calculated only with the need of detection of the conductivity, a detection process is rigorous with a small error, and detection results are accurate and intuitive.

Description

technical field [0001] The invention relates to a quick determination method for ash content of a sulfenamide vulcanization accelerator, belonging to the technical field of rubber vulcanization accelerator analysis. Background technique [0002] Ash content is one of the important indicators of the quality of rubber additives. The national standards, industry standards or enterprise standards of most rubber additives use ash content as one of the technical requirements to be controlled. Ash refers to the inorganic matter obtained by calcining the remaining residue after the sample is burned under specified conditions, expressed in mass percent. The ash content of rubber additives is mostly soluble ash, which can be controlled by washing with water. [0003] At present, the determination of the ash content of sulfenamide vulcanization accelerators is carried out according to the method stipulated in GB / T11409, also known as the high-temperature ashing method. 2g~5g (accurat...

AI Technical Summary

Problems solved by technology

If unqualified, this batch of products will start from the ash content control point and be reworked in sequence according to the production process. The rework cost is high and the yield will be reduced.

In order to reduce substandard products, only increase the amount of washing water at the ash content control point, but after increasing the amount of washing water, the production cost will remain high due to the treatment of washing water

[0006] 2 High energy consumption: The power of the electric furnace used for carbonization in the method specified in GB / T11409 is at least 2kw, and the power of the high-temperature furnace used for burning is at least 4kw. From the constant weight of the crucible to the completion of the sample test, the electric furnace should work for at least 2 hours, and the high-temperature furnace should work for at least 5 hours

[0007] 3. High toxicity: the carbonization process removes volatile matter, and high-temperature furnace burning makes organic matter burn and volatilize, all of which produce a large amount of toxic and harmful smoke, which is very harmful to the environment and operators