Sodium Silicate Binders

Sodium water glass binder has two main components, one is sodium silicate and the other is water. sodium silicate is its key composition. This compound is composed of sodium, silicon and oxygen elements. Its chemical formula is usually\ (Na_ {2} O\ cdot nSiO_ {2}\), where\ (n\) is called the modulus, which is of great significance. The size of the modulus is related to many properties of sodium silicate. If the\ (n\) value is high, the content of silica in sodium silicate is high, the bonding strength of the binder is also high, and the hardening speed is relatively fast, but the solubility will be poor. On the contrary, when the\ (n\) value is low, the bonding strength is slightly weaker, the hardening speed is slow, but it is easily soluble in water. In practical applications, the modulus of sodium silicate can be finely adjusted according to different needs to meet specific process and performance requirements. Water is also indispensable in sodium water glass binders. First, water is the solvent of sodium silicate, so that sodium silicate can be evenly dispersed to form a uniform and stable solution, which is convenient for coating, impregnation, etc. during use, so that the binder can be in good contact with the bonded material. Second, water plays a key role in the hardening process of the binder. When the sodium water glass binder is applied to the surface of the object, the moisture will gradually evaporate and dissipate, and the concentration of sodium silicate will gradually increase, which will then undergo a series of physical and chemical changes, and finally harden and consolidate, achieving the effect of bonding. And the speed of moisture volatilization also affects the hardening speed and final performance of the binder. If the environment is humid, the moisture volatilizes slowly, and the hardening process is slow; if the environment is dry, the moisture volatilizes quickly, and the hardening speed can be accelerated.

Sodium-based silicate binder is useful in all kinds of applications. For example, in the casting industry, its effectiveness is remarkable. When casting, the casting mold needs to be made, and the sodium-based silicate binder can make the sand particles stick tightly to form a strong casting mold. In this way, when casting the metal melt, the casting mold can withstand its high temperature and pressure, without deformation or collapse, to ensure that the casting is accurately formed and the surface is smooth. It is also indispensable in the fabrication of refractory materials. Kilns, furnaces and other high-temperature facilities need refractory materials. Sodium-based silicate binders can bond refractory aggregates and improve the strength and integrity of refractory materials. In high temperature environments, refractory materials can resist high temperature erosion for a long time and maintain stable operation of facilities with this binder. It is also common in the construction field. It is used for the repair and reinforcement of walls and floors, which can penetrate into gaps, consolidate loose materials, and enhance structural strength. In ancient building repairs, because of its good compatibility with traditional materials, it can strengthen building components without damaging the original style and extend their life. Furthermore, in some industrial production that requires bonding properties and chemical resistance, sodium-based silicate binders can resist a variety of chemical substances due to their good chemical stability, which can meet special production needs and ensure smooth production process and product quality. Overall, sodium silicate binders play an important role in castings, refractories, construction, and specific industrial production scenarios, providing strong support for the completion of fortifications.

Compared with other types of binders, sodium-based silicate binders have many advantages. The first is its environmental protection. Gu Yun: "Sometimes, the land generates wealth, but people's desires are infinite." In today's world, environmental protection is the most important. Sodium-based silicate binders use more natural raw materials, and the preparation process is less polluted and less harmful. It is in line with the current trend of environmental protection. It can avoid the dangers of many traditional binders, protect people's health, and keep the environment clean. Second, it has good fire resistance. This binder is like a strong barrier, and it is not afraid of fire. It is used in high temperature industries, such as metallurgy, ceramics, etc., in high temperature kilns, refractory bonding, can withstand high temperatures of thousands of degrees without change, so that the utensils are stable and the production is guaranteed. It is a good choice for high temperature operations. Furthermore, its bonding force is strong. Just like "the reed is like silk, and the rock is not transferred", it can closely connect the materials. In the building materials and foundry industries, it can make the materials closely combined, improve the strength and stability of the products, and make the structure strong and durable. It also has good water resistance. If placed in a humid place, many binders are susceptible to erosion and fail. However, sodium-based silicate binders are like waterproof barriers, not afraid of water and humidity, and can ensure the bonding effect for a long time. They are fully capable in hydraulic buildings and humid environments. And its cost is quite low. "Take it in moderation, use it in a good way", the raw materials of sodium-based silicate binders are easy to obtain, and the preparation process is not complicated, so the cost is controllable. Compared with other binders, it can reduce costs and increase efficiency in large-scale production applications, which is an economical and practical choice.

When using sodium water glass binder, there are many things to pay attention to. First, it is related to the adjustment of modulus. Modulus is a key parameter characterizing the composition of water glass, which has a great impact on its bonding performance. If the modulus is too high, the viscosity of water glass increases greatly, which is not conducive to coating and penetration, and the hardening speed is too fast, resulting in short operation time; if the modulus is too low, the bonding strength is difficult to achieve expectations. Therefore, it is necessary to precisely adjust the modulus according to the specific use scenario by adding alkaline substances or acidic substances to meet the process requirements. Second, the hardening conditions cannot be ignored. Sodium water glass is usually hardened by blowing or self-hardening. When blowing hardening, the type of gas, flow rate and blowing time will all affect the hardening effect. For example, if the flow rate is too large and the time is too long, it is easy to cause the surface to harden too quickly and produce cracks; when self-hardening, the temperature and humidity of the environment have a significant impact on the hardening process. If the temperature is too low, the hardening speed is slow; if the humidity is too high, it will hinder the evaporation of water and affect the hardening. Therefore, it is necessary to control the hardening environment conditions. The third is the attention to the sand mixing process. When mixing sand, it is necessary to ensure that the sodium water glass is evenly mixed with other materials. Uneven mixing will make the performance of the molding sand uneven, some of the sand will have insufficient bonding strength, and some will be too hard, which will affect the quality of the casting. And the sand mixing time should also be appropriate. If the time is too short, the mixing will be uneven; if the time is too long, it may deteriorate the performance of the molding sand. Fourth, the problem of residual strength should not be underestimated. When the casting is cleaned, if the residual strength of the sodium water glass binder is too high, the difficulty of cleaning the sand will increase significantly, and even damage the casting. Therefore, on the basis of meeting the needs of molding and pouring, the residual strength should be reduced as much as possible. This can be achieved by adding dispersants and other means. Fifth, storage is also important. Sodium water glass should be stored in a sealed container to avoid contact with carbon dioxide in the air to prevent premature reaction and deterioration. And the storage environment should be dry and cool to prevent its performance from changing due to temperature and humidity discomfort.

The storage conditions of soda-water glass binder are crucial to its performance and effectiveness. To properly store soda-water glass binder, the following numbers should be paid attention to. Humidity of the first environment. Soda-water glass binder is easy to absorb moisture. If the storage environment humidity is quite high, it may change the concentration due to absorption of too much water vapor, which affects the bonding performance. Therefore, it should be placed in a dry place, and the humidity should be maintained at a relatively low level, such as between 40% and 60%, so that the properties of the binder can be kept stable. Times and temperature conditions. Temperature also has a significant effect on soda-water glass binder. Excessive temperature may cause the water of the binder to evaporate too quickly, causing it to dry and deteriorate; too low temperature may cause freezing and damage the internal structure. Generally speaking, the storage temperature should be controlled between 5 ° C and 35 ° C. In this temperature range, the binder can maintain good physical state and chemical activity. Furthermore, the choice and sealing degree of the container should not be ignored. Corrosion-resistant containers should be selected to contain sodium water glass binder, such as glass containers or specific plastic containers. And the container should be well sealed to prevent excessive contact with air. Components such as carbon dioxide in the air may react with sodium water glass, causing the binder to deteriorate. Repeat, when storing, avoid severe vibration and collision of the sodium water glass binder. Such external forces may damage its internal structure and affect its performance. It should be placed smoothly and avoid frequent movement. In general, in order to properly store the sodium water glass binder, it is necessary to hold it in a dry environment, at a suitable temperature, in a suitable container with a good seal, and avoid severe vibration and collision, so as to ensure its stable performance during storage for subsequent use.