There are some specific details that need to be paid attention to during the production of polycarboxylic acid water-reducing mother liquor, because these details directly determine the quality of polycarboxylic acid mother liquor. The following points are the precautions in the production of polycarboxylic acid mother liquor:
1. During the production, the temperature has a certain influence on the performance of the product, so different temperatures have different fluidity of the net slurry of the produced polycarboxylic acid mother liquor, so pay attention to controlling the temperature during production.
2. There are many methods for synthesizing polycarboxylic acid mother liquor, and different synthesis methods also have an impact on the performance, so generally, the purpose of saving can be achieved by considering changing the process.
3. Chain transfer agent also has a certain impression on the performance of polycarboxylic acid mother liquor. The addition of chain transfer agent is mainly to control the molecular weight to be too large and cause the molecular weight distribution to be too wide. If too much is added, it will definitely cause the molecular weight to decrease, resulting in the deterioration of the water-reducing effect of the polycarboxylic acid mother liquor. If you want to get more effects, you must make fine adjustments.
After the polycarboxylic acid mother liquor is produced, it needs to be stored. However, when storing it, you must pay attention to the following points:
1. Avoid using storage tanks containing metal substances for storage: Fe3+ will induce adverse side reactions of polycarboxylic acid water reducers, so the reactors and storage containers used in its synthesis cannot be made of carbon steel. The consequences of most carbon steel mutations will reduce and lose their dispersing activity to varying degrees. However, with the advancement of technology, the sensitivity of Fe3+ to the mutation of polycarboxylic acids produced by current synthesis technology has been greatly reduced. Some companies even use carbon steel containers without isolation layers to directly store polycarboxylic acid mother liquors, but the storage temperature should not be high and the storage time should not be long.
2. The temperature is low in winter, and the compounded polycarboxylic acid water reducer products are easy to freeze at negative temperatures, which may cause containers and pipelines to crack and cause accidents. According to actual cases, the freezing point of polycarboxylic acid compound products is generally below -6 to -8°C, with a very narrow range and relatively sensitive. Its easy freezing is related to the solid content of the formula. Low-solid-content medium-efficiency products are more likely to freeze than high-efficiency products with high solid content. The more practical winter negative temperature formula design is to minimize or even remove the functional agent, choose a full mother liquor or a formula close to the full mother liquor, or increase the solid content of the formula, or equip the storage tank with an electric heating rod to increase the temperature and keep it warm. Pay attention to the rainproof, dustproof cover and insulation measures for the heating rod and the junction box to ensure safety. In comparison, the anti-icing measures of the heating device are comprehensive, safe and secure, and do not limit the rationality of the formula performance design and the freedom of material selection.
3. Avoid direct contact between the opening and the outside world, and the mother liquor produced by different processes must be stored separately.
Post time: Sep-15-2025