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Defoamer for Paper Industry Key Points
Defoamers in papermaking industry
In the papermaking industry, defoamers are important. Their role in the papermaking process is particularly critical.
First, raw material characteristics
Defoamers in papermaking industry, the selection of raw materials needs to be fine. Usually silicones, polyethers, etc. Silicones have excellent surface activity and can quickly spread in the foam film, causing it to rupture. Polyethers can exhibit good defoaming and anti-foaming properties in different environments according to their molecular structure. These two types of raw materials have different properties. When selecting materials, they should be selected according to the specific needs of the papermaking process, such as pulp type, production equipment, paper product requirements, etc., to achieve the best effect.
Second, the preparation process
Preparation of defoamer, the process is rigorous. From the mixing of raw materials to the control of reaction conditions, all pay attention to. In the mixing stage, accurate proportions of raw materials are made to ensure uniform composition. During the reaction, parameters such as temperature, pressure, and reaction time must be strictly regulated. Such as the preparation of silicone defoamer, the temperature may affect the formation of silicon-oxygen bonds, which in turn affects the performance of the product. After preparation, fine post-treatment is required, such as filtration and purification, to remove impurities and ensure the stability of product quality.
Third, application points
In the papermaking process, the application of defoamer is crucial. First, the timing of addition must be accurate. In the early stage of pulp preparation, or when the foam is first added, it can effectively inhibit the formation of foam. Second, the amount of addition should be moderate. Too little will cause insufficient defoaming, and too much or cause paper quality problems, such as affecting the uniformity and strength of the paper. Third, the addition method is also different. Continuous drip addition, intermittent addition, etc., can be used, according to the actual production selection. And when adding, it should be ensured that the defoamer is evenly dispersed in the system to give full play to its effectiveness.
Fourth, performance evaluation
Evaluate the performance of the defoamer in the papermaking industry, and consider multiple dimensions. The defoaming speed is the primary indicator, and those who can quickly burst the foam are better. The length of foam suppression is also critical, and the long-term foam suppression can ensure the stability In addition, the impact on the quality of paper products cannot be ignored. Test the physical properties of paper, such as tensile strength, air permeability, etc., to ensure that the application of defoamers does not damage the quality of paper products. At the same time, investigate its chemical stability. Under different acid and alkali environments, the product with stable performance is good.
In the papermaking industry, defoamers are important. Their role in the papermaking process is particularly critical.
First, raw material characteristics
Defoamers in papermaking industry, the selection of raw materials needs to be fine. Usually silicones, polyethers, etc. Silicones have excellent surface activity and can quickly spread in the foam film, causing it to rupture. Polyethers can exhibit good defoaming and anti-foaming properties in different environments according to their molecular structure. These two types of raw materials have different properties. When selecting materials, they should be selected according to the specific needs of the papermaking process, such as pulp type, production equipment, paper product requirements, etc., to achieve the best effect.
Second, the preparation process
Preparation of defoamer, the process is rigorous. From the mixing of raw materials to the control of reaction conditions, all pay attention to. In the mixing stage, accurate proportions of raw materials are made to ensure uniform composition. During the reaction, parameters such as temperature, pressure, and reaction time must be strictly regulated. Such as the preparation of silicone defoamer, the temperature may affect the formation of silicon-oxygen bonds, which in turn affects the performance of the product. After preparation, fine post-treatment is required, such as filtration and purification, to remove impurities and ensure the stability of product quality.
Third, application points
In the papermaking process, the application of defoamer is crucial. First, the timing of addition must be accurate. In the early stage of pulp preparation, or when the foam is first added, it can effectively inhibit the formation of foam. Second, the amount of addition should be moderate. Too little will cause insufficient defoaming, and too much or cause paper quality problems, such as affecting the uniformity and strength of the paper. Third, the addition method is also different. Continuous drip addition, intermittent addition, etc., can be used, according to the actual production selection. And when adding, it should be ensured that the defoamer is evenly dispersed in the system to give full play to its effectiveness.
Fourth, performance evaluation
Evaluate the performance of the defoamer in the papermaking industry, and consider multiple dimensions. The defoaming speed is the primary indicator, and those who can quickly burst the foam are better. The length of foam suppression is also critical, and the long-term foam suppression can ensure the stability In addition, the impact on the quality of paper products cannot be ignored. Test the physical properties of paper, such as tensile strength, air permeability, etc., to ensure that the application of defoamers does not damage the quality of paper products. At the same time, investigate its chemical stability. Under different acid and alkali environments, the product with stable performance is good.
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