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What are the technical indicators water treatment chemicals

2015-12-16 00:47:41

The current production of water treatment chemicals lot, but have no uniform standard, only the individual enterprise standards and test reports, which both supply and demand on the quality of the product, there is no uniform legal discrimination basis. Although the process produced various enterprises water treatment chemicals and raw materials used are different, and the control of the technical indicators are also different, but solvent-based water treatment chemicals common to several important technical indicators should be consistent, which facilitates Use the Find problems. The following will be discussed in several technical standards.
 
First, acidity
 
Any type of water treatment chemicals for pH are the technical specifications must be strictly controlled. Especially solvent-based water treatment chemicals, acidity index is more important, because the cleaning is finished workpiece, mostly without any treatment, the quality of water treatment chemicals, and a direct impact on the quality of the workpiece cleaning. So acidity index represents the stability of water treatment chemicals and cleaning of the workpiece quality assurance. Such as the current fluorocarbon, chlorine hydrocarbons, bromine hydrocarbons, hydrocarbons and alcohols and other water treatment chemicals on the market for use in the production process must be strictly controlled acidity, while the change in order to prevent the occurrence of storage and use, must be at the factory When the addition of various stabilizers and antioxidants make it stable, to prevent decomposition in the use and heating. Because these substances decomposition of acidic substances such as HF, HCL and HBr, etc., in the face of trace water becomes acid, after increasing acidity, not only for the cleaning of the workpiece impact, the metal surface and dull, damaged components; and In the long-term effects of acidic medium, stainless steel equipment will be corroded. So the above water treatment chemicals have added stabilizer. If you select a stabilizer amount of bad or insufficient, water treatment chemicals in repeated contact with the heating and air will occur or produce acidity increased oxidative decomposition, water quality deterioration of the medicine, leading to corrosion of the workpiece and so on. Stabilizers or antioxidants usually factory added the following categories: phenols, alcohols and epoxy compounds, etc., the added amount is generally less than 0.05% to 5%. Acidity factory control 10ppm (0.001%) within.
 
Acidity testing is conducted according to the provisions of GB4120.3, it is equivalent to the international standard ISO-1393, using acid-base titration. Since many water treatment chemicals insoluble in water, can not be titrated with lye, instead of using the washing method, titration solvent wash water treatment chemicals from water liquid down. This method is more cumbersome. Ethanol lye can also be used to direct titration method, because a lot of water treatment chemicals are dissolved or partially dissolved in ethanol. This method is simple, reliable, easy to plant testing.
 
Second, water
 
Solvent-based water treatment chemicals water content is also very important indicator, Sheung Shui principles better, but a lot of production and use can not be completely dry, but each solvent and has a certain moisture content. Some completely miscible with water, such as lower alcohols, ketones and ethers portion; some at a certain temperature has a certain saturation solubility, such as hydrocarbons, fluorocarbons, hydrocarbons and chlorine bromine hydrocarbons, moisture exceeding the saturation solubility, delamination occurs, and the solvent stabilizer pumped to the water layer, so that the stability of the solvent water treatment chemicals deteriorate. At the same time the presence of water, water treatment chemicals in free Fˉ, Clˉ and Brˉ ion with water to form acid, creating a vicious cycle in heating use, the acidity is getting higher. Therefore, the acidity of water treatment chemicals and water are the two interdependent indicators directly affects the quality of the cleaning of the workpiece. If the workpiece after cleaning, tarnish or leave watermarks on the workpiece, just like acidity and moisture related. Current domestic production of solvent-based water treatment chemicals, moisture control in 100ppm (0.01%) or less.
 
Trace moisture carried by the provisions of GB6283-86. That Karl Fischer method. Cloud point may also be a simple method, that according to the provisions of GB4120 conduct. It can also be used to analyze gas chromatography.
 
Three, non-volatile matter (residue)
 
The number of water treatment chemicals in non-volatile matter content, directly affect the cleanliness of cleaning the workpiece. Since the cleaning workpiece is immersed in the cleaning solution, then let it dry, then wash liquid non-volatile content may be directly adhered to the workpiece. If electronic components, will affect its electrical properties, in particular the PCB like microcircuit devices attached to the board based on the number of ions per square centimeter much μg (NaClμgcm2) meter, requiring low as possible, the general factory control below 10ppm. This is based on domestic and foreign production of a single solvent-based water treatment chemicals business standards. Its detection method prescribed GB6324.2-86 of conduct. The method is similar to ISO759-1981 of. A simple detection method is to drop the number of drops of water on a glass lens processing agent, let the natural evaporation, watch residual traces on the lens, it can roughly determine the amount of non-volatile water treatment chemicals. Of course this is only qualitative testing.
 
Fourth, toxicity
 
Toxicity is an important indicator of whether the use of water treatment chemicals. Although it has no direct impact on the cleaning of the workpiece, but for humans and the environment has a profound impact, but also our choice whether it's a major factor today. Toxicity of water treatment chemicals, are identified in animal experiments and related infrastructure on human physiology experiments. Strictly speaking, any chemicals are toxic, but the size of the other. The size of the toxicity and safety of human range and take preventive measures, only come through strict animal experiments. Per kilogram of body weight of the animal can withstand the measure. While many chemicals predecessors have done experiments related toxicity is well documented, but now is not the pure water treatment chemicals, data may be available for reference on.
 
The mixture is only through real animal experiments to determine safe concentration range for producers and users to establish a secure protection measures and precautions. Toxicological experiments mainly by two experimental oral and inhalation. The amount of rat LD50 acute oral toxicity test, ie semi-lethal dose, the lower the toxicity; the same amount of rat acute inhalation LD50, the greater that is half the lethal dose, the workpiece environmental allowable concentration higher. According to these measured data, you can develop safety standards and precautions that water treatment chemicals workpiece sites. Toxicological experiments by preventive health sector. According to the provisions of GB5044-85 GB1560-1995 or conduct and pricing.
 
These are discussions on several important indicators common solvent-based water treatment chemicals carried out. Of course, there are many technical indicators of water treatment chemicals, such as insulation, swelling of the material, flammable, volatile, KB value and other technical indicators, because of different cleaning objects vary. But the above four points are common important indicator each water treatment chemicals manufacturer should be considered.

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