What is the thinner for dispensing machine?
A dispensing machine thinner is a chemical reagent specially used in conjunction with a dispensing machine. Its main purpose is to adjust the viscosity of the material to be dispensed so that it can better adapt to the working requirements of the dispensing machine and achieve accurate and efficient dispensing operations. The following is a detailed introduction to dispensing machine thinners:
Main function
Adjusting viscosity: Many materials to be dispensed, such as glue, sealant, lubricant, etc., may have high viscosity in their original state, which is not convenient for accurate dispensing through the needle of the dispensing machine. dispensing machine thinners can effectively reduce the viscosity of these materials, making them thinner and easier to flow, thereby ensuring that the material can be smoothly squeezed out of the needle during the dispensing process to achieve a uniform and continuous dispensing effect.
Improving fluidity: In addition to reducing viscosity, diluents can also improve the overall fluidity of the material. It can make the material flow more smoothly in the dispensing machine's pipeline system, reduce the possibility of clogging the needle or forming a stagnation in the pipeline, and ensure the stability and reliability of the dispensing operation.
Optimizing dispensing effect: By adjusting the viscosity and fluidity of the material, dispensing machine thinners help achieve more accurate dispensing positioning and more uniform dispensing distribution. This is particularly important for some application scenarios with high precision requirements, such as electronic component packaging, micro-electromechanical system (MEMS) manufacturing, etc., which can improve the quality and performance of the product.
Common types and ingredients
Organic solvent type:
Ester compounds: Esters such as ethyl acetate and butyl acetate are common dispensing machine thinner components. They have good solubility and volatility, and can dissolve many common glue and sealant components, thereby reducing their viscosity. Ester compounds usually keep the material stable after dilution, and the volatilization rate is relatively fast, which is conducive to rapid drying after dispensing, and is suitable for some dispensing processes that require drying time.
Ketone compounds: Ketones such as acetone and cyclohexanone can also be used as dispensing machine thinners. Ketones have strong solubility and can effectively decompose some high-molecular components in the material to be dispensed, thereby reducing the viscosity of the material. However, ketone compounds are generally more volatile, and attention should be paid to ventilation conditions when using them to prevent operators from inhaling too much volatile gas.
Special formula type:
Polymer-based diluents: Some diluents developed specifically for specific types of dispensing materials may be based on a certain polymer or polymer composite. These diluents have better compatibility with the materials to be dispensed and can accurately adjust their viscosity without affecting the basic properties of the materials (such as bonding strength, temperature resistance, etc.). For example, for a certain high-performance glue, a diluent based on a specific polymer can reduce the viscosity of the glue while ensuring that the glue can maintain its original bonding strength after curing.
Diluents containing additives: In addition to the main diluent ingredients, this type of diluent also contains some special additives, such as surfactants and stabilizers. Surfactants can further improve the surface tension of the material, making it easier to detach from the needle during the dispensing process and forming uniform droplets; stabilizers help maintain the stability of the diluted material, prevent stratification, precipitation, etc., and ensure the continuity of the dispensing operation.
Key points for use
Determine the dilution ratio:
Based on material properties: Different materials to be dispensed have different tolerance to diluents and required dilution levels. Generally speaking, for glue or sealant with higher viscosity, more diluent may need to be added, and the dilution ratio may be around 10% - 50% of the total volume of the material; while for some materials with relatively low viscosity, the addition ratio may only be 5% - 20%. But this is only a rough range. In actual application, the exact dilution ratio needs to be determined based on the initial viscosity of the specific material, the parameters of the dispensing machine (such as needle size, dispensing pressure, dispensing speed, etc.) and the specific dispensing process requirements.
Experimental determination: Small-scale experiments are usually required to determine the optimal dilution ratio. You can first take a small amount of the material to be dispensed, add diluent according to different proportions, and then observe the viscosity, fluidity, dispensing effect and other aspects of the diluted material, and select the dilution ratio that best meets the requirements.
Add and stir evenly:
Slowly add: Slowly pour the selected dispensing machine thinner into the material to be dispensed, and stir at a uniform speed with a stirring tool while pouring to prevent too many bubbles from being generated when the diluent is poured in quickly, affecting the material properties.
Stir thoroughly: Continue stirring for a few minutes to more than ten minutes to ensure that the diluent and the material to be dispensed are fully mixed to form a uniform liquid mixture. You can judge whether the mixture is fully mixed by observing whether the appearance is uniform and whether there are obvious stratification or particles.