An chemical price inquiry processing requires the core attention to three key points: temperature control, solvent selection, and compatibility matching. At the same time, it is necessary to avoid melt degradation and product defects, ensuring processing efficiency and product quality.
Temperature control: Prevent degradation due to overheating
Temperature is a crucial parameter in the processing process, directly influencing the fluidity and stability of the resin.
The processing temperature must be precisely matched to the resin type. It is usually within the range of 180–250℃, and the exact temperature should be based on the thermal stability data provided by the supplier.
Avoid excessive local temperatures, such as in the screw retention zone or nozzle blockage. Otherwise, it will cause resin decomposition, resulting in bubbles, discoloration or a decline in mechanical properties.
During the cooling stage, the cooling rate must be controlled. If it is too fast, it may cause stress concentration within the product, leading to cracking or deformation; if it is too slow, it will affect the production efficiency.
2. Selection of solvents and additives: Ensure balance between dissolution and performance
The chemical price inquiry of EA is usually processed by the solution method or the melting method. The selection of solvents and additives directly affects the processing procedure and the performance of the final product.
During the processing of the solution, a solvent with good solubility and an appropriate volatility rate (such as toluene or ethyl acetate) should be selected to avoid residual solvents causing the surface of the product to become sticky or resulting in pinholes.
During the melt processing, if additives such as plasticizers and antioxidants need to be added, it is necessary to ensure their compatibility with the resin to prevent the additives from precipitating and affecting the appearance and weather resistance.
Avoid using strong polar or corrosive solvents to prevent damage to the resin molecular structure and reduction of the product's strength.
3. Equipment and process parameters: Matching resin fluidity
Adjust the equipment parameters according to the melt index (MI) of the resin to ensure a stable processing procedure.
During injection or extrusion, the screw rotation speed and back pressure need to be matched with the resin's flowability: for resin with poor flowability, the rotation speed and back pressure should be increased to ensure proper filling; for resin with good flowability, the parameters should be reduced to prevent overflow.
The mold design should be smooth and have good exhaust performance to prevent difficulties in removing the product due to the rough surface of the mold, or the generation of bubbles due to poor exhaust.
Before processing, the resin needs to undergo drying treatment (typically with a moisture content lower than 0.1%). This is to prevent the moisture from evaporating at high temperatures, which could cause silver streaks or voids in the product.
4. Compatibility and Blending Processing: Avoiding Performance Conflicts
If you need to blend and modify with other plastics (such as PVC and ABS), you should pay particular attention to the compatibility issue.
Prioritize the selection of resin grades that have been verified for compatibility, or add compatibilizers (such as maleic anhydride grafting materials) to prevent the separation of the blend system and to avoid affecting the mechanical properties of the final product.
During the blending process, it is necessary to control the mixing ratio and uniformity of each component to avoid excessive concentration in certain areas, which could lead to processing difficulties or uneven performance of the final product.
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